CN203768157U - Ion exchange resin regenerated waste water resource recycling system - Google Patents

Abstract

An ion exchange resin regenerated wastewater resource recovery system uses two-stage reverse osmosis plus electrolysis to treat regenerated wastewater. The concentrated water from the first stage of reverse osmosis is used to electrolyze sodium hypochlorite, and the fresh water from the second stage of reverse osmosis is reused for industrial water in power plants. , denitrification water, etc. The utility model can recycle resources such as sodium chloride and ammonia in the regenerated waste water, and recycle fresh water at the same time, and finally the concentrated water is used to make sodium hypochlorite, so that zero discharge of the regenerated waste water can be realized.

Description

A resource recovery system for ion exchange resin regeneration wastewater

technical field

The utility model belongs to the field of industrial waste water treatment and resource recycling, in particular to a resource recovery system for ion exchange resin regenerated waste water. the

Background technique

At present, the acid-base wastewater regenerated by ion exchange resins in industrial enterprises is usually discharged up to the standard after neutralization treatment, or the recycled wastewater is used to neutralize the remaining acid-base wastewater produced in the enterprise, and the recovery of useful substances in the recycled wastewater is rarely considered. . The following treatment methods have been reported for ion exchange resin regenerated acid-base wastewater: acid-base neutralization method, chemical reaction precipitation method, biochemical method, FENTON reagent method, nanofiltration/reverse osmosis method. the

1) Acid-base neutralization method. (Zhang Jiahua. Experimental Research on Wastewater Treatment and Reuse of Guiyang Power Plant [J]. Water Supply and Drainage, 1994, 04); (Ren Heshe. Comprehensive Utilization of Regenerated Wastewater from Desalination Equipment [J]. Industrial Water Treatment, 1995, 05); (Fang Xi, Zhang Gehong, Han Yaoxia, et al. Technical transformation design for comprehensive utilization of ash waste water and reclaimed waste water in thermal power plants [J]. Environmental Engineering, 2006, 02); (Yu Jun, Zhang Zhanping, Gao Wenfeng. Ion exchange resin regenerated waste water in thermal power plants Treatment and emission reduction [J]. Electric Power Environmental Protection, 2008, 06): 7-9.); (Qian Feng, Xiang Jing, Li Wei, et al. Research on the use of regenerated wastewater from boiler soft water station for flue gas desulfurization [J ].Environmental Science and Technology, 2009,01); (Fang Jinxiang. Engineering practice of comprehensive utilization of chemical wastewater in a power plant[J]. Water Supply and Drainage, 2010,09); (Liu Jingming, Xi Lijuan, Li Bing. Neutralization of acid-base wastewater Optimization of system flocculation conditions and optimal sludge production[J].Environmental Engineering, 2002,05) etc. reported that ion exchange regenerated acidic wastewater was used for boiler ash flushing, alkaline wastewater was used as desulfurizer and acid-base neutralization System optimization and other technologies. the

2) Chemical reaction precipitation method. (Guo Chunmei, Chen, Zhang Zhongzhi. Research on Analysis and Reuse Technology of Salt Wastewater from Gas Injection Boiler[J]. Industrial Water Treatment, 2003,12); (Guo Chunmei, Chen Jinfu. Simulation Experimental Research on Reuse of Ion Exchange Resin Regenerated Wastewater[J] ].Journal of Environmental Engineering, 2008,01); (Che Chunbo.Research on the treatment of ion exchange resin regeneration wastewater by precipitation method[J].Journal of Harbin University of Commerce (Natural Science Edition),2010,03):291-4.) ; (Wang Xiaohui, Li Yuyin. Simulation experiment on the recovery and utilization of ion exchange resin regeneration wastewater [J]. Hebei Metallurgy, 2012, 12): 24-7.) et al reported the removal of hardness in regeneration wastewater by step-by-step chemical reaction precipitation method Ions, recovery of two by-products of calcium salt and magnesium salt, using sodium chloride in the produced water to regenerate sodium ion exchange resin and other technologies. the

3) Biochemical method. (Tang Yunlei. Discussion on the treatment of resin regeneration wastewater from power plants in Shanghai[J]. East China Electric Power, 2001, 12); (Zhang Ping, Chen Xiaoyu. Research on the combination of biological contact oxidation tank-membrane bioreactor for the treatment of power plant regeneration wastewater[J]. East China Electric Power, 2006, 05) and others use biofilm method, biological contact oxidation and membrane bioreactor method to treat ion exchange resin regeneration wastewater, remove organic matter and meet discharge standards. the

4) FENTON reagent method. (Wang Luochun Shen, Ding Huanru, Meng Yi, Yang Guisheng. Fenton Reagent Treatment of Power Plant Ion Exchange Resin Regeneration Wastewater [J]. Environmental Pollution and Prevention, 2001, 05); (Wang Luochun, Li Xiaohua, Jin Long. Using Fenton Reagent-Bioreaction of Mineralized Garbage Combined treatment of ion exchange resin regeneration wastewater[J]. Shanghai Institute of Electric Power, 2009, 05): 461-4.); (Jin Longzhao. Fenton reagent and mineralized waste bioreactor combined treatment of ion exchange resin regeneration wastewater in power plants[ J]. Water supply and drainage, 2004, 12); (Jinlong, Wang Luochun, Chen Mei. Fenton reagent treatment of refractory ion exchange resin regeneration wastewater in power plants [J]. Journal of Suzhou University of Science and Technology (Engineering Technology Edition), 2008, 01): 18 -22.); (Yang Guisheng, Meng Yi, Wang Luochun, et al. Treatment of power plant ion exchange resin regeneration wastewater by catalytic oxidation [J]. Energy Engineering, 2007, 01): 53-5.); (Che Chunbo, Wang Wei. Study on Treatment of Regenerated Wastewater of Ion Exchange Resin in Oil Refinery with Fenton Reagent [J]. Oil Refining and Chemical Industry, 2009, 04): 19-21+58.); Regenerated wastewater [J]. Environmental Science and Management, 2010, 02): 79-81.) etc. used FENTON reagent catalytic oxidation method to treat ion exchange resin regeneration wastewater to remove refractory organic matter and meet the discharge standard. the

5) Nanofiltration/reverse osmosis. (Wang Luochun, Ding Huanru, Wen Renqin. Research on nanofiltration treatment of ion exchange resin regeneration wastewater in power plants [J]. Journal of Shanghai Institute of Electric Power, 2006, 04): 338-40.); (Fu Jierong. Exchange Resin Regeneration Wastewater Recycling Technology [J]. Guangxi Light Industry, 2010, 09): 106-7+37.) Using nanofiltration technology to recycle ion exchange resin regeneration wastewater, remove organic matter in it, and meet the discharge standard. (Wei Li'an, Liao Chengcheng. Reverse osmosis is used in the treatment and reuse of APT ion exchange wastewater [J]. Environmental Science and Technology, 2010,11) etc. used reverse osmosis technology to recycle APT smelting ion exchange alkaline wastewater, and its operating pressure was 1.7 ~1.8 MPa. the

Patent literature related to ion exchange resin regeneration wastewater. the

Patent No. 201120177523.5 Recycling device for regenerated wastewater from chelating resin towers. By adding storage tanks and pumps to the wastewater pipelines, they are reconnected to their respective acid-base disposal pipelines to produce reasonable chemical reactions and reduce final disposal. pressure. the

Application number: 97105951.9 Technology for producing flocculant from ion exchange resin regeneration wastewater, reacting hydrochloric acid or sulfuric acid in regeneration wastewater with iron or aluminum to generate hydrogen, iron salt or aluminum salt, hydrogen recovery and utilization, iron salt or aluminum salt Regenerated wastewater is used as a flocculant. the

Patent No. 201010533707.0 Secondary coagulation and biological synergistic treatment process for PVC acid-base wastewater,

Combining coagulation and biological treatment processes to achieve final discharge standards. the

Application number: 200620094150.4 Acid-base wastewater treatment system, after industrial acid wastewater and industrial alkaline wastewater are neutralized by acid-base wastewater, coagulation, sedimentation, sludge dehydration and other processes, the discharge standard can be reached. the

Patent No. 201220023152.X A resin tower acid-base wastewater recycling system, the acid wastewater and alkaline wastewater flow into the waste acid tank and the waste alkali tank respectively, and the waste acid is transported to the PO workshop saponification wastewater tank through the waste acid pump to neutralize the wastewater , The spent caustic soda is transported to the sodium hypochlorite process through the spent caustic pump to prepare the finished sodium hypochlorite for sale. the

Patent No. 201220079958.0 Automatic dosing device for neutralization and treatment of acid-base wastewater in thermal power plants, combined with acid addition, alkali addition and automatic control device to realize automatic neutralization control of acid-base wastewater. the

According to the analysis of literature search results, acid-base wastewater regenerated by ion exchange resins is mainly regarded as a kind of waste. After acid-base neutralization method, chemical reaction precipitation method, biochemical method, FENTON reagent method, nanofiltration / reverse osmosis method It can be discharged up to the standard, or used in low-quality occasions such as boiler ash flushing, etc. A small amount of technology considers removing the hardness in the regeneration wastewater and then reusing sodium chloride solution as a regenerant for sodium ion exchange resins. When there is no sodium ion exchange Sodium chloride solution cannot be effectively used in the container. (Wei Li'an, Liao Chengcheng. Reverse osmosis is used in the treatment and reuse of APT ion exchange wastewater [J]. Environmental Science and Technology, 2010,11) mentioned that reverse osmosis technology is used to recycle APT smelting ion exchange alkaline wastewater, but its operating pressure Low, only 1.7 ~ 1.8MPa, and did not recover the chemical resources in the wastewater. the

At present, reverse osmosis technology is commonly used in desalinated water treatment systems of industrial enterprises. The positive, negative and mixed ion exchange towers are connected to the reverse osmosis device for desalination treatment. When the ion exchange resin is regenerated, desalinated water is used to dilute high-purity industrial hydrochloric acid and ion membrane alkali As a regeneration solution, the concentration of impurity ions is very low. Since the reverse osmosis device has removed the hardness, sulfate, barium, strontium, silicon and other scaling components in the influent water of the ion exchange tower to a very low level, the salt in the ion exchange regeneration wastewater is mainly sodium brought in by the regenerant Ions and chloride ions, the concentration of scaling components is very low, and it has the technical conditions for reverse osmosis recovery. the

The cation exchange tower regeneration wastewater of the thermal power plant condensate polishing system contains a large amount of chloride ions, ammonia, and a small amount of hardness ions and corrosion products, and the anion exchange tower regeneration wastewater contains a large amount of sodium ions and a small amount of hardness ions, sulfate ions , the two are mixed to become recycled wastewater mainly containing sodium chloride and ammonia, which also has the technical conditions for reverse osmosis recovery. the

Utility model content

The purpose of this utility model is to provide a kind of useful resources such as sodium chloride, ammonia that can recover ion exchange resin regenerated acid-base wastewater, recycle fresh water at the same time, the concentrated water that process system produces can prepare sodium hypochlorite, finally realize the regenerated wastewater zero. Discharged ion exchange resin regeneration wastewater resource recovery system. the

In order to achieve the above object, the system of the present utility model includes: a waste water tank with a fan connected to the cation and anion exchange regeneration waste water, and the outlet of the waste water tank is sequentially connected with a filter/ultrafiltration, a first-stage booster pump and a The first-level security filter is connected, and a scale inhibitor dosing device is installed on the pipeline connecting the first-level booster pump and the first-level security filter. , The inlet of the energy recovery device is connected, the outlet of the first-stage high-pressure pump is connected with the inlet of the first-stage reverse osmosis device, the fresh water outlet of the first-stage reverse osmosis device is connected with the fresh water tank through the pipeline, and the fresh water tank effluent is increased by the fresh water pump After pressure, it is sent to the reuse water point. The concentrated water outlet of the first-stage reverse osmosis device is connected with the inlet of the first-stage and second-stage reverse osmosis device, and the fresh water outlet of the first-stage and second-stage reverse osmosis device is connected with the second-stage reverse osmosis device through pipelines. The fresh water outlet of the secondary reverse osmosis device is connected with the fresh water tank, the concentrated water outlet of the secondary reverse osmosis device is connected with the outlet pipeline of the filter through the pipeline, and the concentrated water outlet of the first-stage and second-stage reverse osmosis device is connected with the energy The other inlet of the recovery device is connected. One outlet of the energy recovery device is connected to the outlet of the first-stage high-pressure pump through a pipeline, and the other outlet is connected to the electrolytic cell. The sodium hypochlorite produced by the electrolytic cell is pumped to the dosing point by the sodium hypochlorite dosing pump. . the

A lift pump is also installed on the pipeline between the waste water tank and the filter/ultrafiltration. the

A clear water tank is also installed between the filter/ultrafiltration and the primary booster pump. the

The antiscalant dosing device includes an antiscalant box and an antiscalant metering pump connected to the antiscalant box and the inlet pipeline of the primary security filter respectively. the

The two-stage reverse osmosis device comprises a two-stage one-stage reverse osmosis device, a two-stage inter-stage booster pump and a two-stage two-stage reverse osmosis device, the fresh water outlet of the first-stage two-stage reverse osmosis device and the second-stage one-stage reverse osmosis device The inlet is connected, the concentrated water outlet of the second-stage and first-stage reverse osmosis device is connected with the inlet of the second-stage and second-stage reverse osmosis device through the booster pump between the second and second stages, and the concentrated water outlet of the second-stage and second-stage reverse osmosis device is connected with the outlet of the filter The pipelines are connected, and the fresh water outlets of the two-stage one-stage reverse osmosis device and the two-stage two-stage reverse osmosis device are respectively connected with the fresh water tank. the

An intermediate water tank, a secondary booster pump, a secondary security filter and a secondary high-pressure pump are sequentially installed on the pipeline between the first-stage and second-stage reverse osmosis device. the

The blower adopts Roots blower. the

The principle of resource recovery of ion exchange resin regeneration waste water of the utility model is to send the ammonia-containing condensate polishing treatment ion exchange resin regeneration waste water into the waste water tank, and control the pH value of the mixed regeneration waste water to reach more than 10; The air is fully mixed, and at the same time, oxygen is supplied to oxidize the possible Fe ²⁺ . The mixed regeneration wastewater is sent to the filter/ultrafiltration through the lift pump to remove suspended particles and iron, and the effluent enters the clean water tank; The pump sends the water out of the clean water tank to the first-level security filter for filtration. Before the first-level security filter, the antiscalant metering pump adds the scale inhibitor stored in the scale inhibitor tank according to the operating conditions, and part of the water out of the first-level security filter Enter the first-stage high-pressure pump to pressurize, and the other part enters the energy recovery device to exchange energy with the concentrated water of the first-stage and second-stage reverse osmosis device, and then enters the first-stage and first-stage reverse osmosis device together with the water from the first-stage high-pressure pump, and the first-stage and first-stage reverse osmosis device The fresh water produced directly enters the fresh water tank for reuse. The fresh water produced by the first-stage and second-stage reverse osmosis devices enters the intermediate water tank. Chlorine, when the ammonia-containing condensate is recovered and the ion-exchange resin regeneration wastewater is polished, the ammonia oxidation and removal reaction is also carried out in the electrolytic cell; the water from the intermediate water tank is sent to the secondary security filter for filtration through the secondary booster pump, After being pressurized by the second-stage high-pressure pump, the effluent water from the first-stage security filter is sent to the second-stage first-stage reverse osmosis device. After the booster pump is pressurized, it enters the secondary and second-stage reverse osmosis device, the fresh water produced by the secondary and second-stage reverse osmosis device enters the fresh water tank, and the concentrated water from the secondary and second-stage reverse osmosis device returns to the clean water tank for further processing; the water from the fresh water tank passes through The fresh water pump is pressurized and sent to the reuse water point; the sodium hypochlorite produced by the electrolytic cell is sent to the dosing point by the sodium hypochlorite dosing pump.

The utility model has the following effects:

1) The water quality of ion exchange resin regeneration wastewater targeted by this utility model is characterized by low hardness, sulfate radicals, silicon dioxide and other scaling components. Reverse osmosis can be used to recover a large amount of sodium chloride in wastewater, providing reverse osmosis recovery rate, Make the operating pressure reach 8MPa or higher, and the salt content of the concentrated reverse osmosis concentrated water reach 8% or higher, so as to recover the fresh water in the largest amount, and retain a small amount of sodium chloride in the concentrated water;

2) Since the iron in the regenerated wastewater will pollute the reverse osmosis membrane, an aeration-filtration/ultrafiltration process is set up before the reverse osmosis to oxidize the Fe ²⁺ that may exist in the wastewater. The filter medium is quartz sand or manganese sand. During the filtration process, an active catalytic layer is formed on the surface of the filter material, which converts dissolved iron into insoluble Fe(OH) ₃ and is removed by filtration. At the same time, particulate iron oxides are also filtered out, and then connected to an ultrafiltration device to remove Regenerate particulate matter in wastewater, thereby protecting reverse osmosis units;

3) For ammonia-containing condensate polishing treatment of regenerated wastewater, reverse osmosis operates at a pH value of 10 or higher, and the low removal rate of molecular substances by the reverse osmosis membrane is used to make the ammonia in the regenerated wastewater mainly It passes through the reverse osmosis membrane in the form of ammonia molecules and retains it in fresh water, so as to recover the ammonia resources in the recycled wastewater. The higher the operating pH value, the more ammonia recovered; 

4) The first-stage reverse osmosis adopts two-stage arrangement, and the reverse osmosis membrane adopts seawater desalination membranes from companies such as DOW, HYDRANAUTICS, TORAY, KOCH, GE, etc. When recovering ammonia, the reverse osmosis operates at a pH value of 10 or higher Under certain conditions, the operating pressure reaches the limit pressure of the membrane (8MPa or higher), when the salinity of the regenerated wastewater is about 2%, the recovery rate of the system is above 75%, and the salt content of the concentrated water is above 8%;

5) The first stage of reverse osmosis adopts the design of fresh water segmental reuse. The first stage has a low concentration multiple and the fresh water has a low salt content and can be reused directly. The second stage has a higher concentration multiple and the fresh water salt content exceeds 1000mg/ L, continue to enter the secondary reverse osmosis for desalination treatment;

6) The first-stage reverse osmosis uses an energy recovery device to recover the energy of concentrated water, and the operating power consumption is only 3-4kWh/m ³ of fresh water;

7) The second-stage reverse osmosis adopts two-stage arrangement, with a booster pump between the stages, and the reverse osmosis membrane adopts brackish water membranes from DOW, HYDRANAUTICS, TORAY, KOCH, GE and other companies. When ammonia is recovered, the reverse osmosis operates at When the pH value is 10 or higher, the produced fresh water is mixed with the fresh water of the first stage of reverse osmosis and then reused, and the concentrated water is returned to the first stage of reverse osmosis for further treatment;

8) The concentrated water of the first stage of reverse osmosis mainly contains sodium chloride. When treating the ammonia-containing condensate and polishing the recycled wastewater, there is still a high amount of ammonia in the concentrated water. The concentrated water is sent to the electrolyzer for electrolysis. The generated sodium hypochlorite completely oxidizes and removes the ammonia, and further electrolyzes it to make a sodium hypochlorite solution, which can be used for sterilization;

9) The electrolytic cell uses a titanium-based metal oxide coating DSA anode, and the catalytic active coating is composed of RuO ₂ , IrO ₂ , Ta ₂ O ₅ , SnO ₂ , PbO ₂ , TiO ₂ and other metal oxides, which has a low High chlorine evolution potential and high oxygen evolution potential are beneficial to the direct and indirect oxidation of ammonia, and are also suitable for the electrolysis of sodium chloride solution to produce sodium hypochlorite.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the utility model. the

In the figure, 1-wastewater tank, 2-lift pump, 3-filter/ultrafiltration, 4-clean water tank, 5-first-level booster pump, 6-first-level security filter, 7-first-level high-pressure pump, 8 -First-stage one-stage reverse osmosis device, 9-first-stage two-stage reverse osmosis device, 10-energy recovery device, 11-electrolyzer, 12-intermediate water tank, 13-secondary booster pump, 14-secondary security filter, 15-Second-stage high-pressure pump, 16-Second-stage one-stage reverse osmosis device, 17-Second-stage two-stage reverse osmosis device, 18-Second-stage booster pump, 19-Fresh water tank, 20-Fresh water pump, 21-Scale inhibition Agent box, 22-antiscalant metering pump, 23-Roots blower, 24-sodium hypochlorite dosing pump. the

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in further detail. the

Referring to Fig. 1, the system of the present utility model comprises: comprise the waste water tank 1 that links to each other with Roots blower 23 with cation, anion exchange regeneration waste water, the outlet of waste water tank 1 is connected with lift pump 2, filter/ultrafiltration successively through pipeline 3. The clean water tank 4, the primary booster pump 5 and the primary security filter 6 are connected, and the pipeline connecting the primary booster pump 5 and the primary security filter 6 is also provided with scale inhibitor dosing The antiscalant dosing device includes the antiscalant box 21 and the antiscalant metering pump 22 connected to the inlet pipeline of the antiscalant box 21 and the primary security filter 6 respectively, and the primary security filter 6 The outlet water of the first-stage high-pressure pump 7 and the inlet of the energy recovery device 10 are respectively connected through pipelines, the outlet of the first-stage high-pressure pump 7 is connected with the inlet of the first-stage reverse osmosis device 8, and the fresh water outlet of the first-stage reverse osmosis device 8 The pipeline is connected with the fresh water tank 19, and the outlet water of the fresh water tank 19 is pressurized by the fresh water pump 20 and then sent to the reuse water point. , the concentrated water outlet of the first-stage and second-stage reverse osmosis device 9 is connected with the other inlet of the energy recovery device 10, one outlet of the energy recovery device 10 is connected with the outlet of the first-stage high-pressure pump 7 through a pipeline, and the other outlet is connected with the electrolytic cell 11 The sodium hypochlorite produced by the electrolytic cell 11 is sent to the dosing point by the sodium hypochlorite dosing pump 24, and the fresh water outlet of the first-stage and second-stage reverse osmosis device 9 is connected with the intermediate water tank 12, the second-stage booster pump 13, and the second-stage water tank successively through the pipeline. The security filter 14, the secondary high-pressure pump 15 and the secondary reverse osmosis device are connected, and the secondary reverse osmosis device includes a secondary one-stage reverse osmosis device 16, a secondary inter-stage booster pump 18 and a secondary two-stage reverse osmosis device 17 , the fresh water outlet of the first-stage two-stage reverse osmosis device 9 communicates with the inlet of the second-stage one-stage reverse osmosis device 16, and the concentrated water outlet of the second-stage one-stage reverse osmosis device 16 is connected with the second-stage two-stage reverse osmosis device 18 through the booster pump 18 between the two stages. The inlet of the osmosis device 17 is connected, the concentrated water outlet of the second-stage two-stage reverse osmosis device 17 is connected with the outlet pipeline of the filter/ultrafiltration 3, the second-stage one-stage reverse osmosis device 16 and the second-stage two-stage reverse osmosis device 17 The fresh water outlets are respectively communicated with the fresh water tank 19. the

Referring to Fig. 1, the principle of resource recovery of the ion exchange resin regeneration waste water of the utility model is to send the ammonia-containing condensate polishing treatment ion exchange resin regeneration waste water into the waste water tank 1, and control the pH value of the mixed regeneration waste water to reach more than 10; in the waste water tank 1 Use Roots blower 23 to blow air into for full mixing, and at the same time supply oxygen to oxidize the Fe ²⁺ that may exist, send the mixed regenerated wastewater to filter/ultrafiltration 3 through lift pump 2 to remove suspended particles and iron, and the effluent enters Clean water tank 4; through the primary booster pump 5, the water from the clean water tank 4 is sent to the primary security filter 6 for filtration, and before the primary security filter 6, the antiscalant metering pump 22 is added and stored in the antiscalant according to the operating conditions For the antiscalant in the box 21, part of the outlet water from the first-stage security filter 6 enters the first-stage high-pressure pump 7 for pressurization, and the other part enters the energy recovery device 10 to exchange energy with the concentrated water of the first-stage and second-stage reverse osmosis device 9. The water output from the first-stage high-pressure pump 7 enters the first-stage one-stage reverse osmosis device 8 together, the fresh water produced by the first-stage one-stage reverse osmosis device 8 directly enters the fresh water tank 19 for reuse, and the fresh water produced by the first-stage two-stage reverse osmosis device 9 enters the intermediate water tank 12 , the concentrated water of the first-stage and second-stage reverse osmosis device 9 is sent to the electrolytic cell 11 for electrolytic chlorine production after passing through the energy recovery device 10 to exchange energy. 11 carries out the oxidation removal reaction of ammonia; through the secondary booster pump 13, the output water from the intermediate water tank 12 is sent to the secondary security filter 14 for filtration, and the secondary security filter 14 effluent is pressurized by the secondary high-pressure pump 15 and then sent to the secondary The first-stage reverse osmosis device 16, the fresh water produced by the second-stage first-stage reverse osmosis device 16 enters the fresh water tank 19, and the concentrated water of the second-stage first-stage reverse osmosis device 16 enters the second-stage second stage after being pressurized by the booster pump 18 between the second stage The reverse osmosis device 17, the fresh water produced by the second-stage and second-stage reverse osmosis device 17 enters the fresh water tank 19, and the concentrated water of the second-stage and second-stage reverse osmosis device 17 returns to the clean water tank 4 to continue processing; Afterwards, send to the reuse water point; the sodium hypochlorite produced by the electrolytic cell 11 is sent to the dosing point by the sodium hypochlorite dosing pump 24.

The utility model can recycle resources such as sodium chloride and ammonia in the regenerated wastewater, and recycle fresh water at the same time. The concentrated water produced by the process is used to make sodium hypochlorite bactericide, and the overall realization of resource recycling and zero discharge of regenerated wastewater has good advantages economic and environmental benefits;

The technology of the utility model is used to recycle ion exchange resin regeneration wastewater. When the salt content of the regeneration wastewater is about 2%, the salinity of the recyclable fresh water is about 400-600 mg/L, the fresh water recovery rate is greater than 75%, and the salt content of the concentrated water More than 8%; when recovering ammonia-containing condensed water and polishing the regenerated wastewater, the recovery rate of ammonia is about 50% to 60%, which is retained in fresh water, and the remaining ammonia in concentrated water is oxidized and degraded in the electrolytic cell to achieve harmlessness. Sodium hypochlorite produced by electrolysis is used for sterilization;

The technology of the utility model is used to recycle ammonia-containing ion exchange resin regeneration wastewater, and the ammonia-containing fresh water produced can be used for replenishing water in industrial water or denitrification systems of power plants. Since denitrification in power plants requires the use of purchased ammonia water, after reuse of ammonia-containing fresh water, it can Reduce the amount of purchased ammonia, and the economic benefits are obvious;

The technology of the utility model is used to recycle ion exchange resin regeneration wastewater. The concentrated water is made of sodium hypochlorite by electrolysis process, which can oxidize and degrade the remaining ammonia in the concentrated water to achieve harmlessness. At the same time, the produced sodium hypochlorite is used for sterilization and disinfection, which can reduce the amount of chlorine purchased from the power plant. The cost of sodium chloride, the economic benefit is obvious. the

The water quality of the mixed cation and anion exchange resin regeneration wastewater is shown in Table 1, and the water volume is 5m ³ /h.

Table 1 Mixed water quality of ion exchange regeneration wastewater from a power plant

Adopting the treatment process of the utility model, the proportioning amount of the regenerated waste water of the positive and negative resin regeneration towers is adjusted according to the pH value measured by the pH meter arranged in the waste water tank 1, so that the pH value is about 10. The manganese sand filter is sent to the manganese sand filter through the lifting pump 2, and the iron removal is filtered, and then filtered through the ultrafiltration device, and the produced water enters the clean water tank 4. the

The first-stage reverse osmosis device adopts two-stage arrangement, the operating pressure of reverse osmosis is 8.5MPa, the recovery rate is 75%, the membrane flux is about 17L/m ² *h; the salt content of the first stage fresh water is about 450mg/L, and the ammonia content is about 1700mg/ L, directly enters the fresh water tank 19; the salt content of the second section of fresh water is about 2000mg/L, the ammonia content is about 2500mg/L, and enters the middle water tank 12; the salt content of the concentrated water is about 80900mg/L, the ammonia content is about 5000mg/L into the electrolyzer 11.

The two-stage reverse osmosis device is arranged in two stages, with pressurization between stages, the operating pressure of reverse osmosis is about 2.0MPa, the recovery rate is 90%, the membrane flux is about 30L/m ² *h; the salt content of fresh water is about 470mg/L, and the ammonia content About 2100mg/L enters the fresh water tank 19; the concentrated water has a salt content of about 15000mg/L and an ammonia content of about 3000mg/L, and returns to the clean water tank 4 to continue processing.

The concentrated water of the first-stage reverse osmosis device is electrolyzed in the electrolytic cell 11, the anode of the electrolytic cell DSA is made of Ti/RuO ₂ -IrO ₂ material, the electrolysis time is 90-120min, the current density is 100-200mA/m ² 5000mg/L ammonia nitrogen is completely degraded to produce a sodium hypochlorite solution with a concentration of about 7‰, which is used as a biocide in the condenser cooling system of a power plant.

Implementation effect: adopting the process of the utility model to recycle the ion exchange resin regeneration wastewater of the power plant condensate polishing treatment system, the recovery rate of ammonia-containing fresh water is greater than 75%, the recovery rate of ammonia is greater than 52% (retained in fresh water), and the fresh water is reused in the power plant The denitrification system uses water, and the concentrated water is used to make sodium hypochlorite, which is used as a biocide in the condenser cooling system of the power plant. The remaining ammonia nitrogen is completely oxidized and removed, and the recycling of resources and zero discharge of waste water are realized as a whole. the

Claims (7)

1. A resource recovery system for ion exchange resin regeneration wastewater, characterized in that: it includes a waste water tank (1) with a fan (23) connected to the cation and anion exchange regeneration waste water, and the outlet of the waste water tank (1) passes through the pipeline sequentially It is connected with the filter/ultrafiltration (3), the primary booster pump (5) and the primary security filter (6), and the primary booster pump (5) is connected with the primary security filter (6) There is also an antiscalant dosing device on the connected pipeline. The outlet water of the primary security filter (6) is respectively connected with the inlet of the primary high-pressure pump (7) and the energy recovery device (10) through the pipeline. The outlet of the pump (7) is connected to the inlet of the first-stage one-stage reverse osmosis device (8), and the fresh water outlet of the first-stage one-stage reverse osmosis device (8) is connected with the fresh water tank (19) through the pipeline, and the water outlet of the fresh water tank (19) passes through The fresh water pump (20) is pressurized and sent to the return water point. The concentrated water outlet of the first-stage and first-stage reverse osmosis device (8) is connected with the inlet of the first-stage and second-stage reverse osmosis device (9). The fresh water outlet of (9) is connected with the secondary reverse osmosis device through the pipeline, the fresh water outlet of the secondary reverse osmosis device is connected with the fresh water tank (19), and the concentrated water outlet of the secondary reverse osmosis device is connected with the filter/super The outlet of the filter (3) is connected with the pipeline, the concentrated water outlet of the first-stage and second-stage reverse osmosis device (9) is connected with the other inlet of the energy recovery device (10), and one outlet of the energy recovery device (10) is connected to the The outlet of the first-stage high-pressure pump (7) is connected, and the other outlet is connected with the electrolytic cell (11). The sodium hypochlorite produced by the electrolytic cell (11) is sent to the dosing point by the sodium hypochlorite dosing pump (24). 2. The ion exchange resin regeneration wastewater resource recovery system according to claim 1, characterized in that: a lift pump ( 2). 3. The ion exchange resin regeneration wastewater resource recovery system according to claim 1, characterized in that: a clean water tank ( 4). 4. The ion exchange resin regeneration wastewater resource recovery system according to claim 1, characterized in that: the scale inhibitor dosing device includes a scale inhibitor box (21) and a scale inhibitor box (21) respectively 1. An antiscalant metering pump (22) connected to the inlet pipeline of the primary security filter (6). 5. The ion exchange resin regeneration wastewater resource recovery system according to claim 1, characterized in that: the two-stage reverse osmosis device includes a two-stage one-stage reverse osmosis device (16), a two-stage inter-stage booster pump (18 ) and the second-stage two-stage reverse osmosis device (17), the fresh water outlet of the first-stage two-stage reverse osmosis device (9) communicates with the inlet of the second-stage one-stage reverse osmosis device (16), and the second-stage one-stage reverse osmosis device (16) The outlet of the concentrated water is connected to the inlet of the second-stage reverse osmosis device (17) through the booster pump (18) between the two stages, and the concentrated water outlet of the second-stage reverse osmosis device (17) is connected to the filter/ultrafiltration The outlet pipelines of (3) are connected, and the fresh water outlets of the second-stage one-stage reverse osmosis device (16) and the second-stage two-stage reverse osmosis device (17) are respectively connected with the fresh water tank (19). 6. The ion exchange resin regeneration wastewater resource recovery system according to claim 1 or 5, characterized in that: the pipelines between the first-stage and second-stage reverse osmosis devices (9) and the second-stage reverse osmosis devices are installed sequentially An intermediate water tank (12), a secondary booster pump (13), a secondary security filter (14) and a secondary high-pressure pump (15) are arranged. 7. The ion exchange resin regeneration wastewater resource recovery system according to claim 1, characterized in that: the fan (23) is a Roots fan.