CN110803803A - Treatment agent and treatment method for wet desulphurization wastewater - Google Patents
Treatment agent and treatment method for wet desulphurization wastewater Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 32
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims abstract description 21
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 19
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 19
- 239000004571 lime Substances 0.000 claims abstract description 19
- 239000008267 milk Substances 0.000 claims abstract description 19
- 210000004080 milk Anatomy 0.000 claims abstract description 19
- 235000013336 milk Nutrition 0.000 claims abstract description 19
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 18
- 230000000382 dechlorinating effect Effects 0.000 claims abstract description 18
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 17
- 239000002244 precipitate Substances 0.000 claims abstract description 12
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims abstract description 11
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims abstract description 11
- 238000006477 desulfuration reaction Methods 0.000 claims description 26
- 230000023556 desulfurization Effects 0.000 claims description 26
- 239000002245 particle Substances 0.000 claims description 21
- 238000006386 neutralization reaction Methods 0.000 claims description 14
- 238000005189 flocculation Methods 0.000 claims description 13
- 230000016615 flocculation Effects 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims description 11
- 229960000892 attapulgite Drugs 0.000 claims description 10
- 239000011230 binding agent Substances 0.000 claims description 10
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 10
- 239000000292 calcium oxide Substances 0.000 claims description 10
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 10
- 238000005352 clarification Methods 0.000 claims description 10
- 239000004927 clay Substances 0.000 claims description 10
- 239000011790 ferrous sulphate Substances 0.000 claims description 10
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 10
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 10
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 10
- 229910052625 palygorskite Inorganic materials 0.000 claims description 10
- 150000002500 ions Chemical class 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 7
- 238000004062 sedimentation Methods 0.000 claims description 7
- 238000006298 dechlorination reaction Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 239000010419 fine particle Substances 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- 229920003063 hydroxymethyl cellulose Polymers 0.000 claims description 5
- 229940031574 hydroxymethyl cellulose Drugs 0.000 claims description 5
- 238000004898 kneading Methods 0.000 claims description 5
- 239000007791 liquid phase Substances 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 5
- 239000010802 sludge Substances 0.000 claims description 5
- DNJIEGIFACGWOD-UHFFFAOYSA-N ethanethiol Chemical compound CCS DNJIEGIFACGWOD-UHFFFAOYSA-N 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 230000001112 coagulating effect Effects 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 238000005191 phase separation Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 2
- YBBRCQOCSYXUOC-UHFFFAOYSA-N sulfuryl dichloride Chemical compound ClS(Cl)(=O)=O YBBRCQOCSYXUOC-UHFFFAOYSA-N 0.000 claims description 2
- 150000003568 thioethers Chemical class 0.000 claims description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 claims 1
- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 claims 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract description 8
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 229910021645 metal ion Inorganic materials 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000007787 solid Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 3
- 229910001634 calcium fluoride Inorganic materials 0.000 description 3
- 229910052681 coesite Inorganic materials 0.000 description 3
- 239000000084 colloidal system Substances 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- 229910052906 cristobalite Inorganic materials 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000003311 flocculating effect Effects 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 229910052731 fluorine Inorganic materials 0.000 description 3
- 239000011737 fluorine Substances 0.000 description 3
- 229910052602 gypsum Inorganic materials 0.000 description 3
- 239000010440 gypsum Substances 0.000 description 3
- -1 ion compound Chemical class 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 229910052682 stishovite Inorganic materials 0.000 description 3
- 229910052905 tridymite Inorganic materials 0.000 description 3
- 208000028659 discharge Diseases 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 235000009024 Ceanothus sanguineus Nutrition 0.000 description 1
- 240000003553 Leptospermum scoparium Species 0.000 description 1
- 235000015459 Lycium barbarum Nutrition 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical class OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000011899 heat drying method Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000003573 thiols Chemical class 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5263—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using natural chemical compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The invention discloses a treatment agent for wet desulphurization wastewater, which comprises the following components: 25-30mg/L of lime milk solution with the concentration of 5%, 40-60mg/L of organic sulfide with the concentration of 15%, 35-45mg/L of ferric chloride sulfate with the concentration of 40%, 9-10mg/L of PAM with the concentration of 0.05% and 2-3mg/L of hydrochloric acid with the concentration of 3%, the method is suitable for treating the waste water containing corrosive chloride ions, and firstly, heavy metals and a small amount of chloride ions in the waste water are separated in a lime milk solution mode in the waste water containing the chloride ions; and removing residual metal ions in the wastewater by a method of generating precipitates through a chemical reaction, and finally adding a dechlorinating agent for dechlorinating, so that the removal of the chloride ions in the wastewater is realized, and the subsequent thorough harmless treatment of the wastewater is conveniently realized.
Description
Technical Field
The invention relates to the technical field of tea tree planting, in particular to a treatment agent and a treatment method for wet desulphurization wastewater.
Background
The impurities contained in the desulfurization wastewater mainly comprise suspended matters, supersaturated sulfite, sulfate and heavy metals, wherein a lot of pollutants are the first pollutants which are required to be strictly controlled in the national environmental protection standard, and the desulfurization wastewater has the characteristics of high salinity, high heavy metal content, corrosivity, low chroma, high hardness and the like, and has the characteristics of specificity, complexity, strong corrosivity and the like, and the treatment and recycling difficulty is extremely high. At present, domestic and foreign enterprises carry out certain treatment on the desulfurization wastewater, but mainly adopt a chemical precipitation method for treatment, and the treated desulfurization wastewater is difficult to recycle. If the treated wastewater is directly discharged, not only water resources are wasted, but also the physicochemical properties of soil and water are changed, secondary pollution is caused, and the ecological environment is damaged. With the tightening of the regulations on the flue gas desulfurization wastewater, the zero discharge treatment of the desulfurization wastewater becomes a necessary trend.
At present, the zero discharge technology of wastewater in China is still in the initial stage, and the technology mainly adopts the combination of flue gas waste heat drying and membrane concentration with MVR evaporation crystallization. The flue gas waste heat drying method has the problems that a spray drying system is easy to scale and block, the system cannot stably run for a long time, and the dried solid substance is soluble miscellaneous salt which is solid dangerous waste, so that the subsequent treatment difficulty is high.
Disclosure of Invention
The invention provides a treatment agent and a treatment method for wet desulphurization wastewater, which aim to solve the problems in the background art.
The invention provides a treatment agent for wet desulphurization wastewater, which comprises the following components: lime milk solution with the concentration of 5 percent is 25-30mg/L, organic sulfide with the concentration of 15 percent is 40-60mg/L, ferric chloride sulfate with the concentration of 40 percent is 35-45mg/L, PAM with the concentration of 0.05 percent is 9-10mg/L and hydrochloric acid with the concentration of 3 percent is 2-3 mg/L.
The invention also provides a treatment method of the wet desulphurization wastewater, which comprises the following steps:
s1: feeding the desulfurization wastewater into a neutralization tank, adding a lime milk solution for neutralization, and increasing the pH value of the wastewater to be more than 9.0 so that most heavy metal ions in the wastewater generate insoluble hydroxide precipitate in an alkaline environment;
s2: sending the wastewater subjected to neutralization treatment in the S1 into a settling tank for settling, adding organic sulfide into the wastewater, and reacting the organic sulfide with residual heavy metal to form insoluble sulfide for settling;
s3: sending the wastewater subjected to the sedimentation treatment in the S2 into a flocculation box, adding ferric chloride sulfate to enable colloidal particles and suspended matter particles to be coagulated and aggregated, and coagulating fine particles in the wastewater into large particles to be deposited and then carrying out liquid phase separation;
s4: adding PAM at a wastewater outlet of the flocculation tank, and sending the PAM into a clarification tank for sedimentation;
s5: and in the precipitated wastewater, the precipitate is concentrated into sludge at the bottom of a clarification tank, and dechlorinating agent is added into the upper layer liquid at the separation part, so that treated effluent can be obtained.
Preferably, the organic sulfide in S2 is one of thiol, ethanethiol, thioether, ethanethiolsulfonic acid, sulfonate or sulfonyl chloride.
Preferably, the PH value and the turbidity of effluent are monitored, and the PH value and the turbidity reach the drainage standard for discharging; otherwise, adding acid to adjust the pH value or sending the pH value back to the neutralization tank for continuous treatment until the pH value is qualified.
Preferably, the dechlorination agent in S5 comprises the following components: 20-30 parts of ferrous sulfate, 20-40 parts of calcium oxide and 10-25 parts of attapulgite clay.
Preferably, the preparation of the dechlorination agent comprises the following steps:
a 1: mixing ferrous sulfate, calcium oxide and attapulgite clay, and fully kneading;
a 2: adding a binder into the uniformly mixed material of the a1, and mixing and grinding the material into paste;
a 3: the paste in a2 is dried at the temperature of 160-180 ℃ to prepare the dechlorinating agent.
Preferably, the binder in a2 is silica sol or hydroxymethyl cellulose.
The invention provides a treatment agent and a treatment method for wet desulphurization wastewater, which have the beneficial effects that: the method is suitable for treating the waste water containing corrosive chloride ions, and firstly, heavy metals and a small amount of chloride ions in the waste water are separated in a lime milk solution mode in the waste water containing the chloride ions; and removing residual metal ions in the wastewater by a method of generating precipitates through a chemical reaction, and finally adding a dechlorinating agent for dechlorinating, so that the removal of the chloride ions in the wastewater is realized, and the subsequent thorough harmless treatment of the wastewater is conveniently realized.
Detailed Description
The invention is further illustrated by the following examples.
Example 1
The invention provides a treatment agent for wet desulphurization wastewater, which comprises the following components: lime milk solution with the concentration of 5% 25mg/L, organic sulfide with the concentration of 15% 40mg/L, ferric chloride sulfate with the concentration of 40% 35/L, PAM9mg/L with the concentration of 0.05% and hydrochloric acid with the concentration of 3% 2 mg/L;
a method for treating wet desulphurization wastewater comprises the following steps:
s1: when the desulfurization wastewater enters the neutralization tank, a certain amount of lime milk solution is added to increase the pH value of the wastewater to be more than 9.0, so that most heavy metal ions generate insoluble hydroxide precipitate in an alkaline environment.
S2: after lime milk is added into the sedimentation desulfurization wastewater of the heavy metal ion compound, most heavy metal ions can form insoluble hydroxide when the pH value reaches 9.0-9.5; meanwhile, Ca2+ in the lime milk reacts with part of F-in the wastewater to generate insoluble calcium fluoride, so that the effect of removing fluorine is achieved; in the neutralized wastewater, the contents of Cd2+ and Hg2+ still exceed the standard, so organic sulfide is added into a settling tank to react with residual Cd2+ and Hg2+ to form insoluble sulfide for deposition.
S3: the content of suspended matters in the desulfurization wastewater is large, and the desulfurization wastewater mainly contains gypsum particles, SiO2, Al3+ and Fe3+ hydroxide. The flocculation method is adopted to lead the colloid particles and the suspended particles to be coagulated and aggregated, thereby separating from the liquid phase, and ferric chloride sulfate is added into a flocculation box to lead the fine particles in the wastewater to be coagulated into large particles and deposited.
S4: PAM is added at the wastewater outlet of the flocculation tank and is sent into a clarification tank for precipitation, so that the growth process of particles is further strengthened, and fine flocculates slowly become thick solid flocculating constituents easier to deposit.
S5: and (3) after the flocculated wastewater enters a clarification tank and is treated by adding a dechlorinating agent, precipitates are deposited at the bottom and are concentrated into sludge, the upper part is treated effluent, and an online monitoring instrument is used for monitoring the pH value and the turbidity of the effluent. If the PH value and the turbidity reach the drainage design standard, discharging the wastewater through a water outlet pump; otherwise, hydrochloric acid is added to adjust the pH value or the pH value is sent back to the neutralization tank for continuous treatment until the pH value is qualified.
The dechlorination agent comprises the following components: 20-30 parts of ferrous sulfate, 20-40 parts of calcium oxide and 10-25 parts of attapulgite clay by weight, and the preparation of the dechlorinating agent comprises the following steps:
a 1: mixing ferrous sulfate, calcium oxide and attapulgite clay, and fully kneading;
a 2: adding a binder into the uniformly mixed material of the a1, and mixing and grinding the material into paste, wherein the binder is silica sol or hydroxymethyl cellulose;
a 3: the paste in a2 is dried at the temperature of 160-180 ℃ to prepare the dechlorinating agent.
Example 2
The invention provides a treatment agent for wet desulphurization wastewater, which comprises the following components: lime milk solution with concentration of 5% 28mg/L, organic sulfide with concentration of 15% 50mg/L, ferric chloride sulfate with concentration of 40% 40mg/L, PAM9.5mg/L with concentration of 0.05% and hydrochloric acid with concentration of 3% 2.5 mg/L.
A method for treating wet desulphurization wastewater comprises the following steps:
s1: when the desulfurization wastewater enters the neutralization tank, a certain amount of lime milk solution is added, the pH value of the wastewater is increased to be more than 9.0, and most heavy metal ions generate insoluble hydroxide precipitate in an alkaline environment.
S2: after lime milk is added into the sedimentation desulfurization wastewater of the heavy metal ion compound, most heavy metal ions can form insoluble hydroxide when the pH value reaches 9.0-9.5; meanwhile, Ca2+ in the lime milk reacts with part of F-in the wastewater to generate insoluble calcium fluoride, so that the effect of removing fluorine is achieved; in the neutralized wastewater, the contents of Cd2+ and Hg2+ still exceed the standard, so 50mg/L of organic sulfide with the concentration of 15% is added into a settling tank, and the organic sulfide reacts with residual Cd2+ and Hg2+ to form insoluble sulfide for deposition.
S3: the content of suspended matters in the desulfurization wastewater is large, and the desulfurization wastewater mainly contains gypsum particles, SiO2, Al3+ and Fe3+ hydroxide. The flocculation method is adopted to lead the colloid particles and the suspended particles to be coagulated and aggregated, thereby separating from the liquid phase, and ferric chloride sulfate is added into a flocculation box to lead the fine particles in the wastewater to be coagulated into large particles and deposited.
S4: PAM is added at the wastewater outlet of the flocculation tank and is sent into a clarification tank for precipitation, so that the growth process of particles is further strengthened, and fine flocculates slowly become thick solid flocculating constituents easier to deposit.
S5: and (3) after the flocculated wastewater enters a clarification tank and is treated by adding a dechlorinating agent, precipitates are deposited at the bottom and are concentrated into sludge, the upper part is treated effluent, and an online monitoring instrument is used for monitoring the pH value and the turbidity of the effluent. If the PH value and the turbidity reach the drainage design standard, discharging the wastewater through a water outlet pump; otherwise, the pH value is adjusted by adding hydrochloric acid or sent back to the neutralization box for continuous treatment until the pH value is qualified.
The dechlorination agent comprises the following components: 20-30 parts of ferrous sulfate, 20-40 parts of calcium oxide and 10-25 parts of attapulgite clay, and the preparation of the dechlorinating agent comprises the following steps:
a 1: mixing ferrous sulfate, calcium oxide and attapulgite clay, and fully kneading;
a 2: adding a binder into the uniformly mixed material of the a1, and mixing and grinding the material into paste, wherein the binder is silica sol or hydroxymethyl cellulose;
a 3: the paste in a2 is dried at the temperature of 160-180 ℃ to prepare the dechlorinating agent.
Example 3
The invention provides a treatment agent for wet desulphurization wastewater, which comprises the following components: 30mg/L of lime milk solution with the concentration of 5 percent, 60mg/L of organic sulfide with the concentration of 15 percent, 45mg/L of ferric chloride sulfate with the concentration of 40 percent, 10mg/L of PAM with the concentration of 0.05 percent and 3mg/L of hydrochloric acid with the concentration of 3 percent.
A method for treating wet desulphurization wastewater comprises the following steps:
s1: when the desulfurization wastewater enters the neutralization tank, a certain amount of lime milk solution is added to increase the pH value of the wastewater to be more than 9.0, so that most heavy metal ions generate insoluble hydroxide precipitate in an alkaline environment.
S2: after lime milk is added into the sedimentation desulfurization wastewater of the heavy metal ion compound, most heavy metal ions can form insoluble hydroxide when the pH value reaches 9.0-9.5; meanwhile, Ca2+ in the lime milk reacts with part of F-in the wastewater to generate insoluble calcium fluoride, so that the effect of removing fluorine is achieved; in the neutralized wastewater, the contents of Cd2+ and Hg2+ still exceed the standard, so organic sulfide is added into a settling tank to react with residual Cd2+ and Hg2+ to form insoluble sulfide for deposition.
S3: the content of suspended matters in the desulfurization wastewater is large, and the desulfurization wastewater mainly contains gypsum particles, SiO2, Al3+ and Fe3+ hydroxide. The flocculation method is adopted to lead the colloid particles and the suspended particles to be coagulated and aggregated, thereby separating from the liquid phase, and ferric chloride sulfate with concentration is added into a flocculation box, so that the fine particles in the wastewater are coagulated into large particles and deposited.
S4: PAM is added at the wastewater outlet of the flocculation tank and is sent into a clarification tank for precipitation, so that the growth process of particles is further strengthened, and fine flocculates slowly become thick solid flocculating constituents easier to deposit.
S5: and (3) after the flocculated wastewater enters a clarification tank and is treated by adding a dechlorinating agent, precipitates are deposited at the bottom and are concentrated into sludge, the upper part is treated effluent, and an online monitoring instrument is used for monitoring the pH value and the turbidity of the effluent. If the PH value and the turbidity reach the drainage design standard, discharging the wastewater through a water outlet pump; otherwise, hydrochloric acid is added to adjust the pH value or the pH value is sent back to the neutralization tank for continuous treatment until the pH value is qualified.
The dechlorination agent comprises the following components: 20-30 parts of ferrous sulfate, 20-40 parts of calcium oxide and 10-25 parts of attapulgite clay, and the preparation of the dechlorinating agent comprises the following steps:
a 1: mixing ferrous sulfate, calcium oxide and attapulgite clay, and fully kneading;
a 2: adding a binder into the uniformly mixed material of the a1, and mixing and grinding the material into paste, wherein the binder is silica sol or hydroxymethyl cellulose;
a 3: the paste in a2 is dried at the temperature of 160-180 ℃ to prepare the dechlorinating agent.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. The treatment agent for the wet desulphurization wastewater is characterized by comprising the following components: lime milk solution with the concentration of 5 percent is 25-30mg/L, organic sulfide with the concentration of 15 percent is 40-60mg/L, ferric chloride sulfate with the concentration of 40 percent is 35-45mg/L, PAM with the concentration of 0.05 percent is 9-10mg/L and hydrochloric acid with the concentration of 3 percent is 2-3 mg/L.
2. The method for treating wastewater from wet desulfurization according to claim 1, comprising the steps of:
s1: feeding the desulfurization wastewater into a neutralization tank, adding a lime milk solution for neutralization, and increasing the pH value of the wastewater to be more than 9.0 so that most heavy metal ions in the wastewater generate insoluble hydroxide precipitate in an alkaline environment;
s2: sending the wastewater subjected to neutralization treatment in the S1 into a settling tank for settling, adding organic sulfide into the wastewater, and reacting the organic sulfide with residual heavy metal to form insoluble sulfide for settling;
s3: sending the wastewater subjected to the sedimentation treatment in the S2 into a flocculation box, adding ferric chloride sulfate to enable colloidal particles and suspended particles to be coagulated and aggregated, and coagulating fine particles in the wastewater into large particles to be deposited and then carrying out liquid phase separation;
s4: adding PAM at a wastewater outlet of the flocculation tank, and sending the PAM into a clarification tank for sedimentation;
s5: and in the precipitated wastewater, the precipitate is concentrated into sludge at the bottom of a clarification tank, and dechlorinating agent is added into the upper layer liquid at the separation part, so that treated effluent can be obtained.
3. The method for treating waste water from wet desulfurization according to claim 2, wherein: the organic sulfide in S2 is one of mercaptan, ethanethiol, thioether, ethanethioether sulfonic acid, sulfonate or sulfonyl chloride.
4. The method for treating wastewater from wet desulfurization according to claim 2, wherein: monitoring the pH value and the turbidity of effluent, and discharging when the pH value and the turbidity reach a drainage standard; otherwise, adding acid to adjust the pH value or sending the pH value back to the neutralization tank for continuous treatment until the pH value is qualified.
5. The method for treating wastewater from wet desulfurization according to claim 2, wherein: the dechlorination agent in the S5 comprises the following components: 20-30 parts of ferrous sulfate, 20-40 parts of calcium oxide and 10-25 parts of attapulgite clay.
6. The method for treating wastewater from wet desulfurization according to claim 5, wherein: the preparation method of the dechlorinating agent comprises the following steps:
a 1: mixing ferrous sulfate, calcium oxide and attapulgite clay, and fully kneading;
a 2: adding a binder into the uniformly mixed material of the a1, and mixing and grinding the material into paste;
a 3: the paste in a2 is dried at the temperature of 160-180 ℃ to prepare the dechlorinating agent.
7. The method for treating wastewater from wet desulfurization according to claim 6, wherein: the binder in a2 is silica sol or hydroxymethyl cellulose.
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| IT202000014950A1 (en) * | 2020-06-24 | 2021-12-24 | Martini Giambattista | PROCESS FOR THE TREATMENT OF WATER CONTAINING METALS |
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