CN203307175U - Deep coking wastewater treatment device by using advanced oxidation process combined with membrane bioreactor - Google Patents

Abstract

A membrane bioreactor combined advanced oxidation method coking wastewater advanced treatment device, using the membrane bioreactor to transform the biochemical treatment system: the aerobic pool communicates with the membrane bioreactor through the through hole on the pool wall, and the membrane bioreactor The water outlet of the reactor is connected to the water inlet of the self-priming pump through the pipeline, the water outlet of the self-priming pump is connected with the water production tank through the pipeline, and the water outlet of the water production tank is connected with the water inlet of the air-water mixing pump through the pipeline, and the air-water mixing pump The air inlet of the air-water mixing pump is connected to the advanced oxidation device through a pipeline, and the water outlet of the air-water mixing pump is connected to the inlet of the disinfection device through a pipeline. The water outlet of the disinfection device is the reclaimed water outlet; advantages: reasonable and compact space utilization, simple operation, Low cost; it can completely oxidize refractory organic matter in water, eliminating the need for contact disinfection tanks, avoiding the problem of secondary pollution caused by the introduction of other chemicals, etc., and also solving the problem of concentrated water treatment.

Description

A membrane bioreactor combined advanced oxidation method coking wastewater advanced treatment device

technical field

The utility model belongs to the technical field of environmental protection, and relates to an advanced treatment device for coking wastewater, in particular to an advanced treatment device for coking wastewater combined with a membrane bioreactor and an advanced oxidation method. the

Background technique

Coking wastewater is a kind of industrial wastewater that is recognized as difficult to biodegrade. The difficulty lies in the poor biodegradability of the wastewater. In addition to inorganic pollutants such as ammonia, cyanide and thiocyanate, it also contains heterocyclic rings such as phenols, naphthalene, pyridine, and quinoline. and polycyclic aromatic compounds (PAHS) and other substances that are difficult to biodegrade. These substances can have long-term effects on the environment, and some of them have been confirmed as carcinogens by research. In addition, high concentrations of ammonia nitrogen have a strong inhibitory effect on microbial activity. The effect of biological denitrification is not good. Currently, coking wastewater treatment systems usually include conventional two-stage treatment. Primary treatment refers to the recovery and utilization of pollutants from high-concentration sewage. Its processes include ammonia distillation, ammonia water dephenolation, and final cold water decyanation. It is a pretreatment process. Secondary treatment refers to the harmless treatment of phenol cyanide sewage, mainly based on activated sludge method, and also includes enhanced biological treatment technology. Due to the high cost of further advanced treatment, many domestic coking plants are discouraged, so most coking wastewater is directly discharged after conventional two-stage treatment. However, some toxic and harmful substances (cyanide, COD and heterocyclic compounds, etc.) in the wastewater still cannot meet the discharge standards allowed by the state after the above-mentioned treatment. the

At present, the outstanding problems in the advanced treatment process of coking wastewater are as follows: first, the advanced treatment of wastewater by chemical agents may introduce secondary pollution, or increase the cost of subsequent desalination; second, the use of coking wastewater for wet quenching coke or blast furnace slag, but the pollutants in the wastewater have been transferred, and the operating environment is poor, and there are problems such as pipe network and equipment corrosion. the

In order to promote the upgrading of the industrial structure, standardize the healthy development of the industry, and promote energy conservation, emission reduction and technological progress, the Ministry of Industry and Information Technology of my country promulgated Document No. 15 of "Access Conditions for the Coking Industry (Revised in 2008)" on December 19, 2008, and clearly defined: The phenol cyanide wastewater must be recycled after being treated up to standard, and shall not be discharged outside. Therefore, the advanced treatment and reuse of coking wastewater is the best choice to increase the recycling rate of wastewater, reduce the discharge of sewage, and reduce the consumption of new water. However, seeking an efficient and low-cost advanced treatment and reuse technology is the current coking There is an urgent need for advanced wastewater treatment. the

With the aggravation of water shortage, membrane separation technology has been developed rapidly recently. Among them, Membrane Bioreactor (MBR for short) is a new type of high-efficiency sewage treatment and reuse technology that organically combines high-efficiency membrane retention and biological treatment, and is also one of the most advanced sewage treatment and regeneration technologies in the world. one. Membrane bioreactor has many obvious advantages that cannot be compared with other biological treatment processes. The main points are as follows: 1. It can efficiently separate solid and liquid, and the separation effect is much better than that of traditional sedimentation tanks. The water quality is good and the water is suspended The pollutants and turbidity are close to zero, which can be directly reused to realize the recycling of sewage; 2. The high-efficiency interception effect of the membrane makes the microorganisms completely trapped in the reactor, the concentration of microorganisms in the reactor is high, and the impact load resistance is strong; 3. It is beneficial to the interception, growth and reproduction of slow-growing nitrifying bacteria, and the nitrification efficiency of the system is improved; 4. The sludge age is long; membrane separation makes the macromolecular refractory components in the sewage have enough in the bioreactor with limited volume The residence time greatly improves the degradation efficiency of refractory organic matter. The reactor operates under high volume load, low sludge load and long sludge age, and can realize basically no residual sludge discharge. The application of the advanced oxidation method can further further treat the MBR effluent, and the effluent can be directly reused, which can save a lot of production water and avoid the problem of concentrated water treatment caused by the double-membrane method. the

Contents of the invention

The purpose of the utility model is to overcome the deficiencies in the prior art, and provide a membrane that can reduce the cost of coking wastewater treatment, save a large amount of production water, is economical, practical, efficient, and can form reclaimed water reuse and resource utilization. Bioreactor combined advanced oxidation coking wastewater advanced treatment device. the

For realizing the purpose of this utility model, we will adopt following technical scheme to implement:

A membrane bioreactor combined advanced oxidation coking wastewater advanced treatment device, including a pretreatment system, a biochemical treatment system and a control room, the pretreatment system includes a degreasing tank, a regulating tank and a flotation tank connected in sequence The water outlet of the pond is connected with the pretreatment coking wastewater input pipe of the device; the biochemical treatment system includes anaerobic pond, anoxic pond and aerobic pond, and the pretreatment coking wastewater input pipe passes through anaerobic pond, anoxic pond successively It is connected with the aerobic pool; the control room is equipped with all equipment circuit control units, and the control adopts PLC device, which can realize automatic operation; it is characterized in that: the device also includes: membrane bioreactor, advanced oxidation device, disinfection device, air-water mixing pump and produced water tank;

The aerobic pool communicates with the membrane bioreactor through the through hole on the pool wall, the water outlet of the membrane bioreactor is connected with the water inlet of the self-priming pump through the pipeline, and the water outlet of the self-priming pump is connected with the water-producing tank through the pipeline. The water inlet is connected, the water outlet of the water production tank is connected to the water inlet of the air-water mixing pump through the pipeline, the air inlet of the air-water mixing pump is connected to the oxidation device through the pipeline, and the water outlet of the air-water mixing pump is connected to the water inlet of the disinfection device through the pipeline Connected, the water outlet of the disinfection device is the reclaimed water reuse outlet. the

The membrane bioreactor is composed of a membrane bioreactor, an aeration pan, an aeration fan, a membrane module, a sludge return pump, a return valve and microbial colonies; the bottom of the aerobic tank and the membrane bioreactor are equipped with The aeration pan, the aeration pan communicates with the external aeration fan through the pipeline, the bottom of the membrane bioreactor tank is provided with a sewage outlet, the sewage outlet is connected to the inlet of the sludge return pump through the sewage discharge pipe, and the outlet of the sludge return pump passes through The pipelines are respectively connected to one end of the two return valves, and the other ends of the two return valves are connected to the sludge port at the bottom of the anaerobic tank and the anoxic tank through the pipeline, and the membrane bioreactor is equipped with parallel membrane modules , the water outlet of the membrane module is connected with the water inlet of the self-priming pump through a pipeline, and microbial colonies are set in the membrane biochemical reaction tank. the

The advanced oxidation device is any one of an ozone generator, a photocatalytic ozone oxidation device, a metal catalytic ozone oxidation device or a Fenton oxidation tower. the

Described disinfection device is any one in microwave ultraviolet generator, photothermal radiation disinfection device, ultraviolet generator or chlorine dioxide generator. the

The other outlet of the water production tank is connected to the water inlet of the self-priming pump through a pipeline, and the water outlet of the self-priming pump is connected to the membrane biochemical reaction tank through a pipeline. the

The pipeline connecting the self-priming pump and the membrane biochemical reaction tank is provided with a membrane filament backwashing and dosing device. the

The membrane module is composed of hollow fiber ultrafiltration membranes. the

The membrane module is submerged in the membrane biochemical reaction tank. the

Beneficial effect

First, the device uses a membrane bioreactor and adopts an independent immersion design, which can realize online cleaning. The space utilization is reasonable and compact, the operation is simple, the cost is low, the applicability is strong, and it has strong engineering application value. the

Second, the device oxidizes all the refractory organic matter in water by applying advanced oxidation technology, and at the same time saves the contact disinfection tank, avoids the problem of secondary pollution caused by introducing other chemicals, and also solves the problem of double-membrane method. Concentrated water treatment problems. At the same time, it also achieves the purpose of reducing the cost of coking wastewater treatment, saving a large amount of production water, and achieving the effect of excellent and stable effluent. the

Third, the membrane bioreactor technology used in this utility model is a new type of high-efficiency sewage treatment and reuse technology that organically combines high-efficiency interception of membranes with biological treatment, and is also one of the most advanced sewage treatment and regeneration technologies in the world. one. Membrane bioreactor has many obvious advantages that other biological treatment processes cannot match. It can efficiently separate solids and liquids. The separation effect is much better than that of traditional sedimentation tanks. The water quality is good, and the suspended solids and turbidity of the produced water are close to zero. It can be directly reused to realize the resource utilization of sewage; the high-efficiency interception effect of the membrane makes the microorganisms completely trapped in the reactor, which can maintain a high microbial concentration; it is beneficial to the interception, growth and reproduction of slow-growing nitrifying bacteria, and the nitrification efficiency of the system It can be improved; membrane separation makes the macromolecular refractory components in sewage have enough residence time in the bioreactor with limited volume, which greatly improves the degradation efficiency of refractory organic matter. The reactor operates under high volume load, low sludge load, Operating at a long sludge age can achieve basically no residual sludge discharge; the produced water is sterilized by a stinky microwave ultraviolet generator, without the need for chemical treatment, reducing secondary pollution, and providing a reliable guarantee for the quality of reused water. the

Description of drawings

Fig. 1 is the structural representation of the utility model. the

1. Membrane bioreactor, 1-1. Membrane bioreactor, 2. Oxidation device, 3. Self-priming pump, 4. Anaerobic tank, 5. Anoxic tank, 6. Aerobic tank, 7. Water production tank, 8. Air-water mixing pump, 9. Disinfection device, 10. Sludge return pump, 11. Aeration fan, 12. Aeration disc, 13. Pretreatment coking wastewater input pipe, 14. Reclaimed water reuse outlet, 15. Membrane module, 16. Return valve, 17. Membrane filament backwashing dosing device, 18. Control room. the

Detailed ways

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

As shown in Figure 1, a membrane bioreactor combined advanced oxidation method coking wastewater advanced treatment device includes a pretreatment system, a biochemical treatment system and a control room. The pretreatment system includes a degreasing tank, a regulating tank and Flotation tank, the water outlet of the flotation tank is connected with the pretreatment coking wastewater input pipe 13 of the device; the biochemical treatment system includes anaerobic tank 4, anoxic tank 5 and aerobic tank 6, and the pretreatment coking wastewater input The pipe 13 is connected to the aerobic pool 6 through the anaerobic pool 4 and the anoxic pool 5 successively; the control room 18 is provided with all equipment circuit control units, and the control adopts a PLC device, which can realize fully automatic operation; the device also includes : Membrane bioreactor 1, self-priming pump 3, oxidation device 2, disinfection device 9, air-water mixing pump 8, water production tank 7;

Described aerobic pool 6 communicates with membrane bioreactor 1 through the through hole on the pool wall, and the water outlet of membrane bioreactor 1 is connected with the water inlet of self-priming pump 3 by pipeline, and the water outlet of self-priming pump 3 passes through The pipeline communicates with the water production tank 7, the water outlet of the water production tank 7 is connected with the water inlet of the gas-water mixing pump 8 through the pipeline, the air inlet of the gas-water mixing pump 8 is connected with the oxidation device 2 through the pipeline, and the outlet of the gas-water mixing pump 8 The water outlet is connected to the inlet of the disinfection device 9 through a pipeline, and the water outlet of the disinfection device 9 is the reclaimed water outlet 14 . the

The membrane bioreactor is composed of a membrane bioreactor 1-1, an aeration disc 12, an aeration fan 11, a membrane module 15, a sludge return pump 10, a return valve 16 and microbial colonies; the aerobic tank 6 and The bottom of the membrane bioreaction tank 1-1 is equipped with an aeration pan 12, and the aeration pan 12 communicates with the external aeration fan 11 through a pipeline. The sewage pipe is connected to the inlet of the sludge return pump 10, and the outlet of the sludge return pump 10 is respectively connected to one end of the two return valves 16 through pipelines, and the other ends of the two return valves 16 are connected to the anaerobic tank 4 through pipelines. It is connected with the sludge port at the bottom of the anoxic tank 5, and the membrane bioreactor 1-1 is provided with a parallel membrane module 15, and the water outlet of the membrane module 15 is connected with the water inlet of the self-priming pump 3 through a pipeline, and the membrane biochemical reaction Microbial colonies are set in the pool 1-1. the

The oxidation device 2 is any one of an ozone generator, a photocatalytic ozonation device, a metal catalytic ozonation device or a Fenton oxidation tower. the

The disinfection device 9 is any one of a microwave ultraviolet generator, a photothermal radiation disinfection device, an ultraviolet generator or a chlorine dioxide generator. the

The other outlet of the water production tank 7 is connected to the self-priming pump 3 through a pipeline, and the water outlet of the self-priming pump 3 is communicated with the membrane biochemical reaction tank 1-1 through a pipeline. the

The pipe connecting the self-priming pump 3 with the membrane biochemical reaction tank 1-1 is provided with a membrane silk backwashing dosing device 17 . the

The membrane module 15 is composed of hollow fiber ultrafiltration membranes. the

Described oxidation device 2 adopts ozone generator, has realized the discharge of no concentrated water, thus overcomes the difficult problem of double-membrane concentrated water treatment; Described disinfection device 9 adopts microwave ultraviolet generator, and the disinfection device 9 that produced water adopts is The microwave ultraviolet generator is used for disinfection, which is efficient and simple, without the cumbersome and land-occupied use of dosing pumps, dosing boxes and dosing systems required for traditional disinfection. the

As shown in Figure 1, the water inlet of above-mentioned MBR membrane bioreactor 1 links to each other with pretreatment coking waste water input pipe 13, and submerged MBR membrane assembly 15 is arranged side by side in the described reaction tank body, and aeration pan 12 is provided at the bottom, The aeration pan 12 is connected to the aeration fan 11 , the water outlet of the MBR membrane module 15 is connected to the self-priming pump 3 , and the sewage outlet at the bottom of the reaction tank is connected to the sludge return pump 10 . the

The working principle of the above-mentioned coking wastewater advanced treatment device is as follows: MBR membrane bioreactor 1 is equipped with submerged membrane module 15 mainly for the degradation of organic pollutants and the separation of mud and water, and also intercepts part of suspended solids. As the core part of the treatment system, the membrane bioreactor 1-1 includes microbial colonies, membrane modules 15, water collection system, water production system, and aeration system. After aerobic aeration and biological treatment, it is filtered through the membrane element The suction pump 3 is pumped out into the MBR water production pool 7, and the water can be directly discharged or used as low-grade water, such as dust suppression in coal yards, etc.; here, an external membrane processor can also be used for sewage treatment. After the membrane filament is polluted, it can be washed with MBR permeate water. If the reclaimed water is to be reused, the MBR produced water needs advanced treatment. The oxidant produced by the oxidation device 2 is added to the MBR produced water through the gas-water mixing pump 8. The oxidation device 2 mainly further treats the wastewater, removes refractory COD, and sterilizes the effluent. The water quality fully meets the standard for reuse. In addition, this treatment process has no concentrated water discharge, thus overcoming the problem of double-membrane concentrated water treatment. According to needs, the water to be reused is sterilized by disinfection device 9 . Control room 18 is equipped with all equipment circuit control units, and the control adopts PLC device, which can realize fully automatic operation. the

The specific working process of the above-mentioned coking wastewater advanced treatment device is as follows: the wastewater through the pre-treated coking wastewater input pipe 13 enters the MBR membrane bioreaction tank 1-1. The MBR membrane bioreactor 1 adopts a submerged structure, the aeration form adopts the continuous aeration of the aeration fan 11, the aeration intensity is controlled at 0.15-0.4m3/h, the dissolved oxygen (DO) concentration is 1.5-6mg/L, and the membrane is cleaned The cycle is 15-20d. The sludge used is the sludge returned from the aerobic tank 6 in the biochemical treatment process of the coking plant. The purpose is to further biochemically degrade small molecular compounds through high-concentration activated sludge, and also to retain part of the suspended matter. After the coking wastewater enters the MBR membrane biological reaction tank 1, the water after aerobic aeration and biological treatment is filtered by the self-priming pump 3 through the filter membrane 15 and then pumped out, and the sludge is sucked by the sludge return pump 10 and returned to the anaerobic tank. pool 4 and anoxic pool 5. The remaining sludge is regularly mechanically excavated and transported out. the

The produced water pumped out by the self-priming pump 3 can be directly used as low-grade water, such as dust suppression in coal yards, etc., and can also be further processed into the MBR produced water tank 7, which mainly plays a role in regulating water volume. In addition, it can be added by backwashing. After treatment, the MBR membrane module 15 can be regularly backwashed online in the MBR membrane pool 1-1 to maintain the flux and life of the membrane 15. The oxidant produced by the oxidation device 2 is added to the reaction through the air-water mixing pump 8, the purpose is to further treat the wastewater in depth, remove refractory COD, and make the effluent quality meet the requirements for reclaimed water reuse. After being sterilized by the sterilizing device 9, the produced water is reused as reclaimed water. the

The utility model has carried out a 50L/h small-scale test, and the experimental results prove that the device can meet the requirements of the advanced treatment of coking wastewater, the COD removal rate can reach more than 60%, and the conductivity of wastewater between 500 and 2000μs/cm, the system The recovery rate is about 50-70%. the

It should be understood that: although the present embodiment has described the utility model in more detail, these explanations are only a simple description of the utility model, rather than a limitation of the utility model, and any inventions that do not exceed the essence of the utility model , all fall within the protection scope of the present utility model. the

Claims (8)

1. A membrane bioreactor combined advanced oxidation process coking wastewater advanced treatment device, comprising a pretreatment system and a biochemical treatment system and a control room, the pretreatment system comprising a degreasing pond, a regulating pond and a flotation pond connected in sequence, The water outlet of the flotation tank is connected with the pretreatment coking waste water input pipe of the device; the biochemical treatment system includes anaerobic pond, anoxic pond and aerobic pond, and the pretreatment coking waste water input pipe passes through the anaerobic pond, anoxic pond successively. The oxygen pool is connected to the aerobic pool; the control room is equipped with all equipment circuit control units, and the control adopts a PLC device, which can realize fully automatic operation; it is characterized in that: the device also includes: a membrane bioreactor, an advanced oxidation device , disinfection device, air-water mixing pump and water production tank; The aerobic pool communicates with the membrane bioreactor through the through hole on the pool wall, the water outlet of the membrane bioreactor is connected with the water inlet of the self-priming pump through the pipeline, and the water outlet of the self-priming pump is connected with the water-producing tank through the pipeline. The water inlet is connected, the water outlet of the water production tank is connected to the water inlet of the air-water mixing pump through a pipeline, the air inlet of the air-water mixing pump is connected to the advanced oxidation device through a pipeline, and the water outlet of the air-water mixing pump is connected to the inlet of the disinfection device through a pipeline. The water outlet is connected, and the water outlet of the disinfection device is the reclaimed water reuse outlet. the 2. A kind of membrane bioreactor combined advanced oxidation process coking wastewater advanced treatment device according to claim 1, characterized in that: said membrane bioreactor is composed of membrane bioreactor tank, aeration disc, aeration fan , membrane module, sludge return pump, return valve and microbial colony; the bottom of the aerobic tank and the membrane bioreaction tank are equipped with an aeration plate, which communicates with the external aeration fan through the pipeline, and the membrane bioreaction tank There is a sewage outlet at the bottom of the pool, and the sewage outlet is connected to the inlet of the sludge return pump through the sewage pipe. The sludge port at the bottom of the anaerobic pool is connected to the anoxic pool, and membrane modules are arranged side by side in the membrane bioreaction tank, and the outlet of the membrane module is connected to the water inlet of the self-priming pump through a pipeline, set up with microbial colonies. the 3. A membrane bioreactor combined advanced oxidation method coking wastewater advanced treatment device according to claim 1, characterized in that: the advanced oxidation device is an ozone generator, a photocatalytic ozone oxidation device, a metal-catalyzed ozone oxidation device Any one of the device or the Fenton oxidation tower. the 4. A membrane bioreactor combined advanced oxidation method coking wastewater advanced treatment device according to claim 1, characterized in that: the disinfection device is a microwave ultraviolet generator, photothermal radiation disinfection device, ultraviolet generator or Any of the chlorine dioxide generators. the 5. A membrane bioreactor combined with advanced oxidation method coking wastewater advanced treatment device according to claim 1, characterized in that: the other outlet of the water production tank is connected to the water inlet of the self-priming pump through a pipeline, and automatically The water outlet of the suction pump communicates with the membrane biochemical reaction tank through a pipeline. the 6. A membrane bioreactor combined with advanced oxidation method coking wastewater advanced treatment device according to claim 5, characterized in that: the pipeline communicating between the self-priming pump and the membrane biochemical reaction tank is provided with a membrane silk backwash Dosing device. the 7. A membrane bioreactor combined advanced oxidation method coking wastewater advanced treatment device according to claim 2, characterized in that: said membrane modules are composed of hollow fiber ultrafiltration membranes. the 8. A kind of membrane bioreactor united advanced oxidation method coking wastewater advanced treatment device according to claim 2 or 7, is characterized in that: described membrane assembly is submerged in membrane biochemical reaction pool. the

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