CN110921982A - System and method for treating coal chemical industry wastewater by biological catalytic oxidation technology - Google Patents
System and method for treating coal chemical industry wastewater by biological catalytic oxidation technology Download PDFInfo
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- 230000016615 flocculation Effects 0.000 claims description 5
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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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
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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
- 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
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
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- Biological Treatment Of Waste Water (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention provides a system for treating coal chemical industry wastewater by a biological catalytic oxidation technology, which sequentially comprises a grid channel, a hydrolysis acidification tank, a primary sedimentation tank, a biological catalytic oxidation tank, a secondary sedimentation tank, a coagulation sedimentation tank, a sand filter tank and a clean water tank. The invention also provides a system treatment method, which is characterized in that the strong adsorbability of the activated carbon carrier is utilized, efficient microorganisms capable of effectively improving the degradation rate of target organic matters are fixed on the surface and pores of the activated carbon, agar is utilized to carry out immobilization treatment on a microbial inoculum to prepare an immobilized biological oxidation catalyst, and the immobilized biological oxidation catalyst is added into a biological pond to break the restriction step in the biological degradation process and quickly improve the degradation rate of the organic matters.
Description
Technical Field
The invention belongs to the field of wastewater treatment, and particularly relates to a system and a method for treating coal chemical wastewater by using a biological catalytic oxidation technology.
Background
Coal chemical wastewater is industrial wastewater produced in a coal chemical production process. The characteristics of the coal chemical industry wastewater: (1) the components are complex and the concentration of pollutants is high. (2) Large hazard and poor biodegradability: various organic pollutants in the coal chemical industry wastewater are difficult to degrade, so the coal chemical industry wastewater is hazardous. The coal chemical industry wastewater has high content of organic matters such as heterocyclic and aromatic compounds, is difficult to biodegrade, exceeds the tolerance limit of microorganisms in the wastewater, has toxic action on the microorganisms, is not beneficial to the survival of the microorganisms, has poor biodegradability and belongs to one of industrial wastewater difficult to treat.
The mature technology at present is a combined technology of PAC and activated sludge for treating coal chemical wastewater. By utilizing the adsorption capacity of PAC, organic matters and dissolved oxygen are concentrated on the surface and the periphery of the powdered activated carbon, so that the concentration of refractory substances and toxic substances in a macroscopic environment is reduced, the activity of free microorganisms is improved, and the capability of decomposing and removing pollutants is enhanced. Meanwhile, the PAC adsorbs refractory substances and microorganisms, so that the contact time of the microorganisms and the substances is prolonged. As a result of long-term operation, the microorganisms are domesticated, and the removal effect on the organic matters difficult to degrade is improved. However, PAC loss is serious, long-term replenishment is needed, the cost is high, in addition, PAC can only improve the treatment effect of activated sludge on coal chemical wastewater, the system operation time is longer, generally reaching more than 30h, and the effluent is generally more than 100 mg/L.
Disclosure of Invention
The invention aims to provide a system and a method for treating coal chemical industry wastewater by using a biological catalytic oxidation technology, so as to solve the defects caused in the prior art.
A system for treating coal chemical wastewater by a biological catalytic oxidation technology is characterized by sequentially comprising a grid channel, a hydrolysis acidification tank, a primary sedimentation tank, a biological catalytic oxidation tank, a secondary sedimentation tank, a coagulation sedimentation tank, a sand filter tank and a clean water tank; wherein PAC and PAM are arranged in the primary sedimentation tank as flocculating agents and coagulant aids; adding an immobilized biological oxidation catalyst into the biological catalytic oxidation tank; the second-stage sedimentation tank adopts a gravity sedimentation method, immobilized biological oxidation catalyst, activated sludge and the like flow back to the biological catalytic oxidation tank, and effluent overflows to the coagulation sedimentation tank; the coagulating agent in the coagulating sedimentation tank adopts aluminum ferric sulfate, the flocculating agent adopts PAM, the coagulating tank is a rapid mixing reaction tank, and the flocculation reaction tank is a folded plate hydraulic reaction tank; back washing water in the sand filtering pond comes from a clean water pond, and back washing effluent is discharged to a coagulating sedimentation pond; an online detection system is arranged in the clean water tank to detect the COD concentration and the ammonia nitrogen concentration of the effluent.
Preferably, activated carbon is selected as an immobilized carrier for immobilizing the biological oxidation catalyst in the biological catalytic oxidation pond.
Preferably, the hydrolysis acidification tank is divided into a pH adjusting tank and a hydrolysis acidification tank.
Preferably, the hydrolysis acidification pool is provided with a plurality of galleries which are operated in parallel.
Preferably, a submersible stirrer is arranged in the hydrolysis acidification pool.
In order to realize the purpose, the invention also provides a method of the system for treating the coal chemical industry wastewater by the biological catalytic oxidation technology.
Firstly, a hydrolysis acidification tank: the hydrolysis acidification tank is divided into a pH adjusting tank and a hydrolysis acidification tank, wastewater overflows into the hydrolysis acidification tank after being adjusted to 7.5-8.5 in the pH adjusting tank, and the retention time of the hydrolysis acidification tank is 24-32 hours;
next, a primary sedimentation tank: the retention time is 3-6 h.
Next, a biocatalytic oxidation tank: adopting a Biological Catalytic Oxidation Technology (BCOT), wherein the addition amount of the immobilized biological oxidation catalyst is 4-10% of the total volume, the content of the activated sludge is 1000-2000 mg/L, and the retention time is 12-24 h;
next, a secondary sedimentation tank: and the immobilized biological oxidation catalyst, the activated sludge and the like flow back to the biological catalytic oxidation tank, effluent overflows to the coagulating sedimentation tank, and the retention time is 3-6 hours.
Next, a coagulating sedimentation tank: the hydraulic retention time is 2min, the hydraulic retention time of the flocculation reaction tank is 14min, and the total retention time of the coagulation sedimentation tank is 4-6 h.
Next, the sand filter: and discharging the backwash effluent to a coagulation sedimentation tank, wherein the retention time of the sand filter tank is 0.5-1 h.
Finally, a clean water tank: detecting the COD concentration and the ammonia nitrogen concentration of the effluent, and discharging the effluent if the COD concentration is less than or equal to 50mg/L and the ammonia nitrogen concentration is less than or equal to 5 mg/L; otherwise, refluxing to the pH adjusting tank.
The invention has the advantages and positive effects that: by adopting the technical scheme, the treatment rate of the coal chemical wastewater can be improved, and the floor area of a biochemical system is reduced; the addition of the immobilized biological oxidation catalyst can degrade organic matters which can not be degraded by the activated sludge, and the pollution indexes in the effluent quality of the system are greatly reduced; the stability and the impact resistance of a biochemical system added with the immobilized biological oxidation catalyst have certain promotion effect; the particle size of the immobilized biological oxidation catalyst is less than 0.3cm, the precipitation effect is good, the recovery efficiency is high, the immobilized biological oxidation catalyst can be added once, the operation for many years can be maintained, and the operation cost is reduced.
Drawings
FIG. 1 is a schematic view of a system for treating coal chemical wastewater by biocatalytic oxidation according to an embodiment of the present invention
A grid ditch 1, a hydrolysis acidification tank 2, a primary sedimentation tank 3, a biological catalytic oxidation tank 4, a secondary sedimentation tank 5, a coagulation sedimentation tank 6, a sand filter tank 7 and a clean water tank 8
Detailed Description
Embodiments of the present invention will be described below with reference to the accompanying drawings.
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1, a system for treating coal chemical wastewater by a biological catalytic oxidation technology is characterized by sequentially comprising a grid channel 1, a hydrolysis acidification tank 2, a primary sedimentation tank 3, a biological catalytic oxidation tank 4, a secondary sedimentation tank 5, a coagulation sedimentation tank 6, a sand filter tank 7 and a clean water tank 8;
wherein, the hydrolysis acidification pool 2: the wastewater is divided into a pH adjusting tank and a hydrolysis acidification tank, and the wastewater overflows into the hydrolysis acidification tank 2 after being adjusted to 7.5-8.5 in the pH adjusting tank. The hydrolysis acidification pool 2 is provided with a plurality of galleries which are connected in parallel for operation and has the functions of hydrolysis acidification and an adjusting pool, a submersible stirrer is arranged in the pool to strengthen the mutual contact between sludge and wastewater, improve the mass transfer reaction rate and prevent sludge particles in the pool from depositing, and the residence time of the hydrolysis acidification pool is 24-32 hours;
a first-stage sedimentation tank 3: PAC and PAM are used as a flocculating agent and a coagulant aid, and the retention time is 3-6 h;
and (4) biological catalytic oxidation tank: adopting a Biological Catalytic Oxidation Technology (BCOT), wherein the addition amount of the immobilized biological oxidation catalyst is 4-10% of the total volume, the content of the activated sludge is 1000-2000 mg/L, and the retention time is 12-24 h;
a secondary sedimentation tank 5: adopting a gravity settling method, enabling the immobilized biological oxidation catalyst, the activated sludge and the like to flow back to the biological catalytic oxidation tank, and enabling effluent to overflow to the coagulation sedimentation tank, wherein the retention time is 3-6 h;
a coagulating sedimentation tank 6: the coagulant is aluminum ferric sulfate and the flocculant is PAM. The coagulation tank adopts a rapid mixing reaction tank, the hydraulic retention time is 2min, the flocculation reaction tank adopts a folded plate hydraulic reaction tank, the hydraulic retention time is 14min, and the total retention time of the coagulation sedimentation tank is 4-6 h;
and (3) a sand filter 7: backwashing water comes from the clean water tank, and backwashing effluent is discharged to the coagulating sedimentation tank 6. The retention time of the sand filter is 0.5-1 h;
the clean water tank 8: and (3) an online detection system is arranged to detect the COD concentration and the ammonia nitrogen concentration of the effluent, if the COD is less than or equal to 50mg/L and the ammonia nitrogen is less than or equal to 5mg/L, the effluent is discharged outside, and if not, the effluent flows back to the pH adjusting tank part in the hydrolysis acidification tank 2.
The biological catalytic oxidation tank mainly adopts a Biological Catalytic Oxidation Technology (BCOT), wherein the BCOT is a technology for fixing microorganisms with the capacity of efficiently oxidizing organic matters on activated carbon to form an efficient immobilized microbial inoculum taking the activated carbon as a carrier, and then putting the immobilized microbial inoculum into an aerobic biochemical tank to degrade the organic matters in the wastewater. The microorganism after being immobilized in a certain time has no change in the character and quantity, so the immobilized biological oxidation catalyst is called as immobilized biological oxidation catalyst.
The immobilized biological oxidation catalyst needs to meet the following requirements:
① purchasing or developing high-efficiency microbial inoculum capable of degrading coal chemical industry wastewater with high efficiency;
② the specific surface area of the active carbon is more than or equal to 1000m2/g, the pore volume is more than or equal to 0.8m2/g, the strength is more than or equal to 90%, the iodine adsorption value is more than or equal to 1000mg/g, the particle size is less than 0.3cm, and the active carbon is used as an immobilized carrier after being modified by cleaning, acid washing, alkali washing, secondary cleaning and the like;
③ placing the liquid culture medium and the modified activated carbon into a container at normal temperature, stirring for 1-2 h, sterilizing at 121 ℃ for 30min, cooling to room temperature while stirring after sterilization, and continuously stirring for 2-4 h to prepare the biocatalyst carrier;
④ inoculating high-efficiency liquid microbial inoculum in a container for fermentation culture;
⑤ after the culture, draining off the liquid, collecting the solid, and adding 1% agar fixing liquid for immobilization;
⑥ washing with clear water for 1-2 times after the immobilization is finished, and obtaining immobilized particles which are the immobilized biological oxidation catalyst;
⑦ the immobilized biological oxidation catalyst is put into an aerobic biochemical pool to carry out catalytic oxidation reaction under aeration condition to degrade the organic matters in the wastewater.
The pH value of inlet water of the coal chemical industry wastewater is 6-9, COD is less than or equal to 800mg/L, ammonia nitrogen is less than or equal to 20mg/L, chroma is less than or equal to 500 times, and SS is less than or equal to 300 mg/L; COD of the effluent of the hydrolysis acidification tank is less than or equal to 700mg/L, and the chroma is less than or equal to 450 times; COD of the effluent of the primary sedimentation tank is less than or equal to 650mg/L, and SS is less than or equal to 200 mg/L; COD of the effluent of the biological catalytic oxidation tank is less than or equal to 70mg/L, ammonia nitrogen is less than or equal to 5mg/L, and chroma is less than 50 times; COD of the effluent of the secondary sedimentation tank is less than or equal to 60mg/L, and SS is less than or equal to 120 mg/L; COD of the effluent of the coagulating sedimentation tank is less than or equal to 50mg/L, SS is less than or equal to 80mg/L, and the chroma is less than 40 times; the SS of the effluent of the sand filter is less than 70 mg/L; the pH of the effluent of the clean water tank is 6-9, the COD is less than or equal to 50mg/L, the ammonia nitrogen is less than or equal to 5mg/L, the chroma is less than 40 times, and the SS is less than 70 mg/L.
The invention uses the strong adsorbability of the activated carbon carrier to fix the efficient microorganisms capable of effectively improving the degradation rate of the target organic matter on the surface and pores of the activated carbon, then uses agar to carry out immobilization treatment on the microbial inoculum to prepare the immobilized biological oxidation catalyst, and adds the immobilized biological oxidation catalyst into a biological pond to break the restriction in the biological degradation process and quickly improve the degradation rate of the organic matter.
In addition, the activated carbon is added into the system, organic matters which are difficult to degrade can be adsorbed, the concentrations of difficult-to-degrade substances and toxic substances in a macroscopic environment are reduced, the activity of microorganisms in a free state is improved, the capability of decomposing and removing pollutants is enhanced, and the stability and the impact resistance of a biochemical system are promoted to a certain extent.
The invention adopts BCO technology to fix microorganisms with the capacity of efficiently oxidizing organic matters on the activated carbon to form an efficient immobilized microbial inoculum taking the activated carbon as a carrier, and the efficient immobilized microbial inoculum is added into an aerobic biochemical tank in the form of a catalyst to improve the degradation efficiency and the degradation effect of the organic matters in the wastewater. The system has more stable and rapid operation, better water outlet effect, saved operation cost and reduced floor area of the biochemical system.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (6)
1. A system for treating coal chemical wastewater by a biological catalytic oxidation technology is characterized by sequentially comprising a grid channel (1), a hydrolysis acidification tank (2), a primary sedimentation tank (3), a biological catalytic oxidation tank (4), a secondary sedimentation tank (5), a coagulating sedimentation tank (6), a sand filter (7) and a clean water tank (8); wherein PAC and PAM are arranged in the primary sedimentation tank (3) as flocculating agents and coagulant aids; an immobilized biological oxidation catalyst is added into the biological catalytic oxidation tank (4); the secondary sedimentation tank (5) adopts a gravity sedimentation method, immobilized biological oxidation catalyst, activated sludge and the like flow back to the biological catalytic oxidation tank, and effluent overflows to the coagulation sedimentation tank; aluminum ferric sulfate diacetate is adopted as a coagulation agent in the coagulation sedimentation tank (6), PAM is adopted as a flocculating agent, the coagulation tank is a rapid mixing reaction tank, and the flocculation reaction tank is a folded plate hydraulic reaction tank; backwashing water in the sand filter (7) comes from a clean water tank, and backwashing effluent is discharged to a coagulating sedimentation tank; an online detection system is arranged in the clean water tank (8) to detect the COD concentration and the ammonia nitrogen concentration of the effluent.
2. The system for treating coal chemical industry wastewater by using the biocatalytic oxidation technology according to claim 1, characterized in that: active carbon is selected as an immobilized carrier of the immobilized biological oxidation catalyst in the biological catalytic oxidation tank (4).
3. The system for treating coal chemical industry wastewater by using the biocatalytic oxidation technology as claimed in claim 2, wherein the system comprises: the hydrolysis acidification tank (2) is divided into a pH adjusting tank and a hydrolysis acidification tank.
4. The system for treating coal chemical industry wastewater by using the biocatalytic oxidation technology according to claim 3, characterized in that: the hydrolysis acidification pool (2) is provided with a plurality of galleries which are connected in parallel for operation.
5. The system for treating coal chemical industry wastewater by using the biocatalytic oxidation technology according to claim 4, wherein the system comprises: a submersible stirrer is arranged in the hydrolysis acidification tank (2).
6. A method of using the system for treating coal chemical industry wastewater by using the biocatalytic oxidation technology of claim 1, characterized by comprising the steps of:
a: a hydrolysis acidification pool: the hydrolysis acidification tank is divided into a pH adjusting tank and a hydrolysis acidification tank, wastewater overflows into the hydrolysis acidification tank after being adjusted to 7.5-8.5 in the pH adjusting tank, and the retention time of the hydrolysis acidification tank is 24-32 hours;
b: a first-stage sedimentation tank: the retention time is 3-6 h;
c: a biological catalytic oxidation tank: adopting a Biological Catalytic Oxidation Technology (BCOT), wherein the addition amount of the immobilized biological oxidation catalyst is 4-10% of the total volume, the content of the activated sludge is 1000-2000 mg/L, and the retention time is 12-24 h;
d: a secondary sedimentation tank: the immobilized biological oxidation catalyst, the activated sludge and the like flow back to the biological catalytic oxidation tank, effluent overflows to the coagulating sedimentation tank, and the retention time is 3-6 hours;
e: a coagulating sedimentation tank: the hydraulic retention time is 2min, the hydraulic retention time of the flocculation reaction tank is 14min, and the total retention time of the coagulation sedimentation tank is 4-6 h;
f: a sand filter: discharging the backwash effluent to a coagulation sedimentation tank, wherein the retention time of the sand filter tank is 0.5-1 h;
g: a clean water tank: detecting the COD concentration and the ammonia nitrogen concentration of the effluent, and discharging the effluent if the COD concentration is less than or equal to 50mg/L and the ammonia nitrogen concentration is less than or equal to 5 mg/L; otherwise, refluxing to the pH adjusting tank.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112481249A (en) * | 2020-11-27 | 2021-03-12 | 天津滴碳节能科技有限公司 | Preparation method of immobilized biocatalyst |
| CN114349268A (en) * | 2021-12-21 | 2022-04-15 | 北京恩菲环保股份有限公司 | Method for treating industrial wastewater |
| CN115159790A (en) * | 2022-08-03 | 2022-10-11 | 北京恩菲环保技术有限公司 | Treatment method of printing and dyeing wastewater |
| CN116832823A (en) * | 2023-06-21 | 2023-10-03 | 长江生态环保集团有限公司 | Magnetic carbon-iron-manganese bimetallic catalyst and preparation method and application thereof |
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