CN117228908A - Semi-coke wastewater adsorption treatment process - Google Patents
Semi-coke wastewater adsorption treatment process Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 136
- 238000001179 sorption measurement Methods 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title claims abstract description 40
- 239000000571 coke Substances 0.000 title claims abstract description 39
- 230000008569 process Effects 0.000 title claims abstract description 36
- 238000004062 sedimentation Methods 0.000 claims abstract description 95
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 65
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 51
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 42
- 238000005189 flocculation Methods 0.000 claims abstract description 24
- 230000016615 flocculation Effects 0.000 claims abstract description 24
- 238000000926 separation method Methods 0.000 claims abstract description 22
- 238000005086 pumping Methods 0.000 claims abstract description 20
- 239000012535 impurity Substances 0.000 claims abstract description 12
- 238000005273 aeration Methods 0.000 claims abstract description 11
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 239000006228 supernatant Substances 0.000 claims abstract description 10
- 239000012530 fluid Substances 0.000 claims abstract description 9
- 230000015556 catabolic process Effects 0.000 claims abstract description 8
- 238000006731 degradation reaction Methods 0.000 claims abstract description 8
- 239000002344 surface layer Substances 0.000 claims description 36
- 239000002957 persistent organic pollutant Substances 0.000 claims description 21
- 229920002401 polyacrylamide Polymers 0.000 claims description 18
- 239000010802 sludge Substances 0.000 claims description 17
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 230000007062 hydrolysis Effects 0.000 claims description 10
- 238000006460 hydrolysis reaction Methods 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 230000020477 pH reduction Effects 0.000 claims description 10
- 230000003311 flocculating effect Effects 0.000 claims description 2
- 238000004065 wastewater treatment Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 9
- 230000000052 comparative effect Effects 0.000 description 11
- 239000000126 substance Substances 0.000 description 5
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 231100000086 high toxicity Toxicity 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 150000001555 benzenes Chemical class 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000009615 deamination Effects 0.000 description 1
- 238000006481 deamination reaction Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- -1 nitrogen-oxygen heterocyclic compounds Chemical class 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 125000005575 polycyclic aromatic hydrocarbon group Chemical group 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 241001148471 unidentified anaerobic bacterium Species 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention discloses a semi-coke wastewater adsorption treatment process, which belongs to the technical field of wastewater treatment, wherein physicochemical treatment wastewater is pumped to a primary adsorption tank, recycled coke powder is adopted to adsorb impurities, and the impurities are precipitated and separated in a primary sedimentation tank to obtain surface clean water; and pumping the surface clean water to a secondary adsorption tank after biochemical treatment, adding active coke powder, entering a secondary sedimentation tank for sedimentation and separation, enabling supernatant fluid to flow into a flocculation tank, entering a tertiary sedimentation tank for sedimentation, enabling effluent to enter an aeration biological filter for biological degradation and filtration, and obtaining reuse water after the effluent. The semi-coke wastewater adsorption treatment process provided by the invention reduces the COD value in the physicochemical treatment wastewater from 2500-3200mg/L to 80-140 mg/L and reduces the ammonia nitrogen value from 10-100mg/L to 5-10 mg/L. The invention not only greatly improves the treatment effect of the semi-coke wastewater, but also greatly reduces the running cost of enterprises by adopting recycled coke powder to adsorb impurities in the pretreatment unit.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a semi-coke wastewater adsorption treatment process.
Background
The semi-coke wastewater mainly originates from low-temperature carbonization process and gas purification process in low-rank coal, has complex components, contains a large amount of pollutants which are difficult to degrade and have high toxicity, such as benzene series, phenols, polycyclic aromatic hydrocarbon, nitrogen-oxygen heterocyclic compounds and other organic pollutants, and is typical high-pollution and high-toxicity industrial wastewater. After the wastewater is subjected to phenol-ammonia and biochemical treatment, residual organic pollutants which cannot be biochemically treated and are soluble in the wastewater are all remained in the wastewater.
Because the semi-coke industry is late in rising, no mature semi-coke wastewater treatment process exists at home and abroad at present, the existing treatment method still mainly uses the coking wastewater treatment process with similar water quality, namely, physicochemical treatment is carried out firstly, comprising degreasing, deacidification, deamination and dephenolization treatment, so that physicochemical treatment wastewater with COD content of about 2500-3200mg/L and ammonia nitrogen content of about 10-100mg/L is obtained, then adsorption precipitation treatment is carried out, surface clear water and biochemical treatment are obtained, and then advanced treatment is carried out. However, the wastewater directly enters the biochemical treatment after being subjected to the phenol-ammonia treatment, the quality of the water entering the biochemical treatment is poor, the biochemical load is high, and the final effluent index is not up to standard and cannot be recycled, because some non-biochemical and soluble organic pollutants exist in the materialized wastewater, in order to remove the substances, enterprises usually fully adopt fresh active coke powder to perform adsorption treatment in the adsorption precipitation treatment stage, so that the non-biochemical and soluble organic pollutants can be effectively removed, and meanwhile, the running cost of the enterprises can be greatly increased. Therefore, the invention provides a semi-coke wastewater adsorption treatment process.
Disclosure of Invention
The invention provides a semi-coke wastewater adsorption treatment process, which effectively solves the technical problem of high operation cost of the existing wastewater treatment enterprises, has a good removal effect on COD and ammonia nitrogen in semi-coke wastewater and greatly reduces the production cost of the enterprises.
The invention aims to provide a semi-coke wastewater adsorption treatment process, which comprises the steps of pumping physicochemical treatment wastewater into a primary adsorption tank, adopting recycled coke powder to adsorb impurities, and then enabling the recycled coke powder to enter a primary sedimentation tank for sedimentation and separation to obtain surface clear water, wherein the surface clear water enters an intermediate water tank;
pumping the surface clean water to a hydrolysis acidification tank at 29-31 ℃ from an intermediate water tank, enabling effluent to enter an A/O tank, removing organic pollutants through activated sludge, enabling the effluent of the A/O tank to enter a biological sedimentation tank for sedimentation and separation, and obtaining surface wastewater;
pumping the surface layer wastewater to a secondary adsorption tank, adding active coke powder for adsorption treatment, then entering a secondary sedimentation tank for sedimentation and separation, flocculating supernatant fluid, entering a tertiary sedimentation tank for sedimentation, and degrading and filtering the effluent to obtain reuse water, wherein the dissolved oxygen of the effluent enters an aeration biological filter tank with 2-4 mg/L;
the recycled coke powder is the coke powder collected after the secondary sedimentation tank is used for sedimentation.
As a preferred implementation mode, the COD content in the materialized wastewater is 2500-3200mg/L, the ammonia nitrogen content is 10-100mg/L, and the water inflow of the materialized wastewater is 5-6 m 3 /h。
As a preferable implementation mode, the dosage of the recycled coke powder is 2000-4000 mg/L based on the volume of the materialized wastewater.
As a preferred implementation mode, the COD content of the surface clear water is 2000-2500 mg/L, the ammonia nitrogen content is 30-80 mg/L, and the pH value is 7-8.
As a preferred implementation mode, the COD content of the surface layer wastewater is 250-350 mg/L, the ammonia nitrogen content is 5-30 mg/L, and the pH value is 6.5-7.5.
As a preferred embodiment, in the secondary adsorption tank, the addition amount of the active coke powder is 3000-5000 mg/L based on the volume of surface waste water, and the flow rate of the surface waste water is 5-6 m 3 /h。
As a preferred implementation mode, 100-200 mg of polyaluminum chloride and 1-5 mg of polyacrylamide are added into the primary sedimentation tank per liter of materialized wastewater.
As a preferred embodiment, the volume percentage of the activated sludge is 30% -50% based on the volume of the wastewater in the A/O pool.
As a preferred embodiment, 100-200 mg of polyaluminum chloride and 1-5 mg of polyacrylamide are added into the flocculation tank per liter of surface layer wastewater.
As a preferred implementation mode, the COD content of the recycled water is 80-140 mg/L, the ammonia nitrogen content is 5-10 mg/L, and the pH value is 6.5-7.0.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a semi-coke wastewater adsorption treatment process, which is improved based on the existing coking wastewater treatment process, and is used for treating semi-coke wastewater subjected to physical and chemical treatment (deoiling, deacidifying, deaminizing and dephenolizing), so that the indexes of COD value and ammonia nitrogen value of the treated semi-coke wastewater are superior to those of the semi-coke wastewater treated in the prior art, and the investment cost of enterprises is greatly reduced on the basis of improving the treatment effect. Pumping the materialized wastewater to a first-stage adsorption tank in a pretreatment unit, adsorbing impurities by using recycled coke powder, and then entering a first-stage sedimentation tank for sedimentation and separation to obtain surface clear water, thereby reducing impurities and soluble organic pollutants in the wastewater, improving the water quality of the influent water of the biochemical treatment unit, reducing the biochemical treatment load and saving the running cost of enterprises; the surface clean water is pumped to hydrolysis acidification Chi Suanhua for treatment, insoluble organic matters are hydrolyzed into soluble organic matters under the action of anaerobic bacteria, and the macromolecular matters which are difficult to biodegrade are converted into micromolecular matters which are easy to biodegrade, so that the biodegradability of the wastewater is improved, the subsequent aerobic biological treatment is facilitated, the water discharged from the hydrolysis acidification tank enters an A/O tank, organic pollutants are removed through activated sludge, and the water discharged from the A/O tank enters a biological sedimentation tank for sedimentation separation, so that surface wastewater is obtained; the surface layer wastewater is pumped to a secondary adsorption tank, active coke powder is added for adsorption treatment, then the wastewater enters a secondary sedimentation tank for sedimentation and separation, supernatant flows into a flocculation tank for flocculation, then enters a tertiary sedimentation tank for sedimentation, and effluent enters an aeration biological filter for biodegradation and filtration, so that pollutant indexes of the wastewater are reduced, and reuse water is obtained after the effluent of the aeration biological filter. According to the invention, only fresh active coke powder is added into the secondary adsorption tank, and the coke powder after adsorption and precipitation is directly reused and added into the primary sedimentation tank, so that the high-efficiency adsorption of non-biochemical and soluble organic pollutants contained in the physicochemical treatment wastewater can be realized, the load of a biochemical treatment unit is reduced, and the quality of reuse water is improved; more importantly, the coke powder in the secondary sedimentation tank is recycled to the primary sedimentation tank, so that the investment cost of the wastewater treatment of enterprises is greatly reduced. The invention realizes the double effects of improving effect and saving cost together by recycling the coke powder in the semi-coke wastewater treatment process, and has strong practical applicability.
Drawings
FIG. 1 is a flow chart of the semi-coke wastewater adsorption treatment process of the invention; wherein PAC is polyaluminum chloride, and PAM is polyacrylamide.
Detailed Description
In order that those skilled in the art will better understand the technical solution of the present invention, the present invention will be further described with reference to the specific examples and the accompanying drawings, but the examples are not intended to be limiting. The following test methods and detection methods, if not specified, are conventional methods; the reagents and starting materials, unless otherwise specified, are commercially available.
The following examples illustrate the invention in more detail.
Example 1
A semi-coke wastewater adsorption treatment process comprises a pretreatment unit, a biochemical treatment unit and a deep treatment unit, wherein in the pretreatment unit, firstly, physicochemical treatment wastewater with COD content of 2500mg/L and ammonia nitrogen content of 50mg/L is treated by 5m 3 Pumping water inflow to a primary adsorption tank, adding recycled coke powder into the primary adsorption tank, wherein the dosage of the recycled coke powder is 2000mg per liter of the volume of the materialized wastewater, adsorbing impurities and organic pollutants, then entering a primary sedimentation tank, adding 100mg of polyaluminum chloride and 1mg of polyacrylamide into the primary sedimentation tank per liter of the materialized wastewater to carry out sedimentation, and separating to obtain surface clear water, wherein the COD content is 2000mg/L, the ammonia nitrogen content is 30mg/L and the pH value is 7-8;
in the biochemical treatment unit, the surface clear water is treated by 5m 3 Pumping water inflow to a hydrolysis acidification tank with sludge concentration of 10g/L at 29 ℃, enabling effluent to enter an A/O tank, removing organic pollutants through activated sludge with volume percentage of 30%, enabling the effluent of the A/O tank to enter a biological sedimentation tank for sedimentation and separation to obtain surface layer wastewater, wherein COD (chemical oxygen demand) content is 250mg/L, ammonia nitrogen content is 20mg/L, and pH value is 6.5-7.5;
in the advanced treatment unit, the surface layer wastewater is pumped into a secondary adsorption tank, 3000mg of active coke powder is added into the secondary adsorption tank for adsorption treatment according to the volume of per liter of surface layer wastewater, then the surface layer wastewater enters a secondary sedimentation tank for sedimentation separation, supernatant fluid flows into a flocculation tank, 100mg of polyaluminum chloride and 1mg of polyacrylamide are added into the flocculation tank for flocculation according to the volume of per liter of surface layer wastewater, the wastewater enters a tertiary sedimentation tank for sedimentation, the effluent enters an aeration biological filter tank with 2mg/L of dissolved oxygen, degradation and filtration are carried out, and the effluent obtains reuse water with COD content of 80mg/L, ammonia nitrogen content of 5mg/L and pH value of 6.5-7.0.
Example 2
A semi-coke wastewater adsorption treatment process comprises a pretreatment unit, a biochemical treatment unit and a deep treatment unit, wherein in the pretreatment unit, physicochemical treatment wastewater with COD content of 3200mg/L and ammonia nitrogen content of 100mg/L is treated by 6m 3 Pumping water inflow to a primary adsorption tank, adding recycled coke powder into the primary adsorption tank, wherein the dosage of the recycled coke powder is 4000mg per liter of the volume of the materialized wastewater, adsorbing impurities and organic pollutants, then entering a primary sedimentation tank, adding 200mg of polyaluminum chloride and 5mg of polyacrylamide into the primary sedimentation tank per liter of the materialized wastewater to carry out sedimentation, and separating to obtain surface clear water, wherein the COD content is 2500mg/L, the ammonia nitrogen content is 60mg/L and the pH value is 7-8;
in the biochemical treatment unit, the surface clear water is treated by a method of 6m 3 Pumping the water inflow rate per hour to a hydrolysis acidification tank with the sludge concentration of 10g/L at the temperature of 31 ℃, enabling the effluent to enter an A/O tank, removing organic pollutants through activated sludge with the volume percentage of 50%, and enabling the effluent of the A/O tank to enter a biological sedimentation tank for sedimentation and separation to obtain surface layer wastewater, wherein the COD content is 350mg/L, the ammonia nitrogen content is 30mg/L, and the pH value is 6.5-7.5;
in the advanced treatment unit, the surface layer wastewater is pumped into a secondary adsorption tank, 5000mg of active coke powder is added into the secondary adsorption tank for adsorption treatment according to the volume of each liter of surface layer wastewater, then the surface layer wastewater enters a secondary sedimentation tank for sedimentation separation, supernatant fluid flows into a flocculation tank, 200mg of polyaluminum chloride and 5mg of polyacrylamide are added into the flocculation tank for flocculation according to the volume of each liter of surface layer wastewater, the wastewater enters a tertiary sedimentation tank for sedimentation, the effluent enters an aeration biological filter tank with dissolved oxygen of 4mg/L, degradation and filtration are carried out, and the effluent obtains reuse water with COD content of 140mg/L, ammonia nitrogen content of 8mg/L and pH value of 6.5-7.0.
Example 3
A semi-coke wastewater adsorption treatment process comprises a pretreatment unit, a biochemical treatment unit and a deep treatment unit, wherein in the pretreatment unit, physicochemical treatment wastewater with COD content of 3000mg/L and ammonia nitrogen content of 80mg/L is treated by 5m 3 Pumping water inflow to a first-stage adsorption tank, adding recycled coke powder into the first-stage adsorption tank, wherein the dosage of the recycled coke powder is 3000mg per liter of materialized wastewater, adsorbing impurities and organic pollutants, then entering a first-stage sedimentation tank, and adding 150mg of polymerization into the first-stage sedimentation tank per liter of materialized wastewaterPrecipitating aluminum chloride and 3mg polyacrylamide, and separating to obtain surface clear water, wherein the COD content is 2300mg/L, the ammonia nitrogen content is 50mg/L, and the pH value is 7-8;
in the biochemical treatment unit, the surface clear water is treated by 5m 3 Pumping the water inflow rate per hour to a hydrolysis acidification tank with the sludge concentration of 10g/L at 30 ℃, enabling the effluent to enter an A/O tank, removing organic pollutants through activated sludge with the volume percentage of 40%, and enabling the effluent of the A/O tank to enter a biological sedimentation tank for sedimentation and separation to obtain surface layer wastewater, wherein the COD content is 280mg/L, the ammonia nitrogen content is 30mg/L, and the pH value is 6.5-7.5;
in the advanced treatment unit, the surface layer wastewater is pumped into a secondary adsorption tank, 4000mg of active coke powder is added into the secondary adsorption tank for adsorption treatment according to the volume of each liter of surface layer wastewater, then the surface layer wastewater enters a secondary sedimentation tank for sedimentation separation, supernatant fluid flows into a flocculation tank, 150mg of polyaluminum chloride and 3mg of polyacrylamide are added into the flocculation tank for flocculation according to the volume of each liter of surface layer wastewater, the wastewater enters a tertiary sedimentation tank for sedimentation, the effluent enters an aeration biological filter tank with 3mg/L of dissolved oxygen, degradation and filtration are carried out, and the effluent obtains reuse water with COD content of 100mg/L, ammonia nitrogen content of 6mg/L and pH value of 6.5-7.0.
Example 4
A semi-coke wastewater adsorption treatment process comprises a pretreatment unit, a biochemical treatment unit and a deep treatment unit, wherein in the pretreatment unit, physicochemical treatment wastewater with COD content of 2800mg/L and ammonia nitrogen content of 60mg/L is treated by 6m 3 Pumping water inflow to a primary adsorption tank, adding recycled coke powder into the primary adsorption tank, wherein the dosage of the recycled coke powder is 3500mg per liter of the volume of the materialized wastewater, adsorbing impurities and organic pollutants, entering a primary sedimentation tank, adding 180mg of polyaluminium chloride and 2mg of polyacrylamide into the primary sedimentation tank per liter of the materialized wastewater to carry out sedimentation, and separating to obtain surface clear water, wherein the COD content is 2000mg/L, the ammonia nitrogen content is 30mg/L, and the pH value is 7-8;
in the biochemical treatment unit, the surface clear water is treated by a method of 6m 3 Pumping the water inflow to a hydrolysis acidification tank with sludge concentration of 10g/L at 30 ℃ and feeding water outAdding the wastewater into an A/O pool, removing organic pollutants through activated sludge with the volume percentage of 45%, and adding the water discharged from the A/O pool into a biological sedimentation pool for sedimentation and separation to obtain surface-layer wastewater, wherein the COD content is 260mg/L, the ammonia nitrogen content is 10mg/L, and the pH value is 6.5-7.5;
in the advanced treatment unit, the surface layer wastewater is pumped into a secondary adsorption tank, 3200mg of active coke powder is added into the secondary adsorption tank for adsorption treatment according to the volume of per liter of surface layer wastewater, then the surface layer wastewater enters a secondary sedimentation tank for sedimentation separation, supernatant fluid flows into a flocculation tank, 160mg of polyaluminum chloride and 4mg of polyacrylamide are added into the flocculation tank for flocculation according to the volume of per liter of surface layer wastewater, the wastewater enters a tertiary sedimentation tank for sedimentation, the effluent enters an aeration biological filter tank with 3.5mg/L of dissolved oxygen, degradation and filtration are carried out, and the effluent obtains reuse water with COD content of 90mg/L, ammonia nitrogen content of 5mg/L and pH value of 6.5-7.0.
In order to further prove the technical effects of the present invention, the present invention is also provided with comparative examples, which are specifically as follows:
comparative example 1
The difference from example 1 is that: the materialized wastewater does not enter a primary adsorption tank in the pretreatment unit, does not adopt coke powder adsorption treatment, and directly enters a primary sedimentation tank.
A semi-coke wastewater treatment process comprises a pretreatment unit, a biochemical treatment unit and a deep treatment unit, wherein in the pretreatment unit, firstly, physicochemical treatment wastewater with COD content of 2500mg/L and ammonia nitrogen content of 50mg/L is treated by 5m 3 Pumping water inflow to a primary sedimentation tank, adding 100mg of polyaluminium chloride and 1mg of polyacrylamide into the primary sedimentation tank for sedimentation according to the volume of each liter of materialized wastewater, and separating to obtain surface clear water, wherein the COD content is 2300mg/L, the ammonia nitrogen content is 46mg/L, and the pH value is 7-8;
in the biochemical treatment unit, the surface clear water is treated by 5m 3 Pumping the water inflow rate per hour to a hydrolysis acidification tank with the sludge concentration of 10g/L at 29 ℃, enabling the effluent to enter an A/O tank, removing organic pollutants through activated sludge with the volume percentage of 30%, enabling the effluent of the A/O tank to enter a biological sedimentation tank for sedimentation and separation to obtain surface layer wastewater, wherein the COD content is 1350mg/L, and the ammonia nitrogen content is 1350mg/L35mg/L, and the pH value is 7.0-7.5;
in the advanced treatment unit, the surface layer wastewater is pumped into a secondary adsorption tank, 3000mg of active coke powder is added into the secondary adsorption tank for adsorption treatment according to the volume of each liter of surface layer wastewater, then the surface layer wastewater enters a secondary sedimentation tank for sedimentation separation, supernatant fluid flows into a flocculation tank, 100mg of polyaluminum chloride and 1mg of polyacrylamide are added into the flocculation tank for flocculation according to the volume of each liter of surface layer wastewater, the mixture enters a tertiary sedimentation tank for sedimentation, the effluent enters an aeration biological filter tank with 2mg/L of dissolved oxygen, degradation and filtration are carried out, and the effluent obtains reuse water with 263mg/L of COD content, 24mg/L of ammonia nitrogen content and 6.8-7.0 of pH value.
Comparative example 2
The difference from example 1 is that: an equal amount of fresh active coke powder is added into the first-stage adsorption tank.
A semi-coke wastewater adsorption treatment process comprises a pretreatment unit, a biochemical treatment unit and a deep treatment unit, wherein in the pretreatment unit, firstly, physicochemical treatment wastewater with COD content of 2500mg/L and ammonia nitrogen content of 50mg/L is treated by 5m 3 Pumping water inflow to a primary adsorption tank, adding active coke powder into the primary adsorption tank, wherein the dosage of the active coke powder is 2000mg per liter of the volume of the materialized wastewater, adsorbing impurities and organic pollutants, then entering a primary sedimentation tank, adding 100mg of polyaluminium chloride and 1mg of polyacrylamide into the primary sedimentation tank per liter of the materialized wastewater for sedimentation, and separating to obtain surface clear water, wherein the COD content is 1980mg/L, the ammonia nitrogen content is 28mg/L and the pH value is 7-8;
in the biochemical treatment unit, the surface clear water is treated by 5m 3 Pumping water inflow to a hydrolysis acidification tank with sludge concentration of 10g/L at 29 ℃, enabling effluent to enter an A/O tank, removing organic pollutants through activated sludge with volume percentage of 30%, enabling the effluent of the A/O tank to enter a biological sedimentation tank for sedimentation and separation to obtain surface layer wastewater, wherein COD (chemical oxygen demand) content is 246mg/L, ammonia nitrogen content is 21mg/L, and pH value is 6.5-7.5;
in the advanced treatment unit, the surface layer wastewater is pumped into a secondary adsorption tank, 3000mg of active coke powder is added into the secondary adsorption tank for adsorption treatment according to the volume of each liter of surface layer wastewater, then the surface layer wastewater enters a secondary sedimentation tank for sedimentation separation, supernatant fluid flows into a flocculation tank, 100mg of polyaluminum chloride and 1mg of polyacrylamide are added into the flocculation tank according to the volume of each liter of surface layer wastewater for flocculation, the wastewater enters a tertiary sedimentation tank for sedimentation, the effluent enters an aeration biological filter tank with 2mg/L of dissolved oxygen, degradation and filtration are carried out, and the effluent obtains reuse water with COD content of 78mg/L, ammonia nitrogen content of 4.6mg/L and pH value of 6.5-7.0.
The treatment effect of the physicochemical treatment wastewater is detected by using the COD value and the ammonia nitrogen content in the wastewater as evaluation indexes according to the semi-coke wastewater adsorption treatment process provided by the embodiments 1-4 of the invention, and compared with the COD value and the ammonia nitrogen content in the semi-coke wastewater treated by the prior art, and the results are shown in the table 1.
TABLE 1 Effect of the adsorption treatment Process for semi-coke wastewater of examples 1-4 of the present invention and comparative examples 1-2
As shown in Table 1, the adsorption treatment process for the semi-coke wastewater provided by the invention can efficiently reduce the COD value and the ammonia nitrogen value in the physicochemical treatment wastewater, and compared with the coke powder in the secondary sedimentation tank which is not recycled in comparative example 1, the coke powder precipitated in the secondary sedimentation tank is recycled and added into the primary sedimentation tank in embodiment 1-4 of the invention, so that organic pollutants which cannot be biochemically and dissoluble in the physicochemical treatment wastewater are effectively removed, the water quality of inflow water of a biochemical treatment unit is improved, the biochemical load is reduced, the COD value in the physicochemical treatment wastewater is reduced from 2500-3200mg/L to 80-140 mg/L, the ammonia nitrogen value is reduced from 10-100mg/L to 5-10 mg/L, the chemical and industrial pollutant emission standard (COD value <150mg/L, ammonia nitrogen value < 10 mg/L) of GB16171-2012 is met, and the effect is remarkable.
Compared with the method of adding fresh activated coke powder into a primary adsorption tank in comparative example 2, the COD value and the ammonia nitrogen value in the reuse water of example 1 are slightly higher than those in the reuse water obtained in comparative example 2, but the cost accounting is carried out on example 1 and comparative example 2, the fresh activated coke powder is only added into a secondary adsorption tank in example 1, the fresh activated coke powder is added into both the primary adsorption tank and the secondary adsorption tank in comparative example 2, the fresh activated coke powder is only needed to be added in example 1 according to the treatment amount of each ton of wastewater, the total fresh activated coke powder is needed to be added in comparative example 2, about 10-11 kg of fresh activated coke powder is needed to be added in total, the cost of the input of comparative example 2 is about 34.32 yuan more than that of the input of example 1 ton of the wastewater is calculated according to each ton of fresh activated coke powder, the cost of the cost is only increased by 34.32 yuan for each ton of blue carbon in the continuous treatment process of wastewater, and the high cost of enterprises is increased for a long time, so the invention has the advantage of the adsorption process of wastewater treatment cost.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. The semi-coke wastewater adsorption treatment process is characterized by comprising the following steps of:
pumping the materialized wastewater to a first-stage adsorption tank, adsorbing impurities by using recycled coke powder, and then, entering a first-stage sedimentation tank for sedimentation and separation to obtain surface clean water;
pumping the surface clean water to a hydrolysis acidification tank, enabling the effluent to enter an A/O tank, removing organic pollutants through activated sludge, enabling the effluent of the A/O tank to enter a biological sedimentation tank for sedimentation and separation, and obtaining surface wastewater;
pumping the surface layer wastewater to a secondary adsorption tank, adding active coke powder for adsorption treatment, then entering a secondary sedimentation tank for sedimentation and separation, flocculating supernatant fluid flowing into a flocculation tank, entering a tertiary sedimentation tank for sedimentation, and enabling effluent to enter an aeration biological filter tank containing dissolved oxygen for degradation and filtration to obtain reuse water;
the recycled coke powder is the coke powder collected after the secondary sedimentation tank is used for sedimentation.
2. The process for adsorption treatment of semi-coke wastewater according to claim 1, wherein the COD content in the physicochemical treatment wastewater is 2500-3200mg/L, the ammonia nitrogen content is 10-100mg/L, and the water inflow of the physicochemical treatment wastewater is 5-6 m 3 /h。
3. The process for adsorption treatment of semi-coke wastewater according to claim 2, wherein the amount of the recycled coke powder is 2000-4000 mg/L based on the volume of the materialized wastewater.
4. The semi-coke wastewater adsorption treatment process according to claim 1, wherein the COD content of the surface clean water is 2000-2500 mg/L, the ammonia nitrogen content is 30-80 mg/L, and the pH value is 7-8.
5. The semi-coke wastewater adsorption treatment process according to claim 1, wherein the COD content of the surface wastewater is 250-350 mg/L, the ammonia nitrogen content is 5-30 mg/L, and the pH value is 6.5-7.5.
6. The process for adsorption treatment of semi-coke wastewater according to claim 1, wherein the addition amount of the active coke powder is 3000-5000 mg/L in the secondary adsorption tank based on the volume of surface wastewater, and the flow rate of the surface wastewater is 5-6 m 3 /h。
7. The process for adsorption treatment of semi-coke wastewater according to claim 1, wherein 100-200 mg of polyaluminum chloride and 1-5 mg of polyacrylamide are added into the primary sedimentation tank per liter of materialized wastewater.
8. The semi-coke wastewater adsorption treatment process according to claim 1, wherein the volume percentage of the activated sludge is 30% -50% based on the volume of wastewater in the a/O tank.
9. The process for adsorption treatment of semi-coke wastewater according to claim 1, wherein 100-200 mg of polyaluminum chloride and 1-5 mg of polyacrylamide are added into the flocculation tank per liter of surface layer wastewater by volume.
10. The process for adsorption treatment of semi-coke wastewater according to claim 1, wherein the COD content of the recycled water is 80-140 mg/L, the ammonia nitrogen content is 5-10 mg/L, and the pH value is 6.5-7.0.
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