CN111620520A - System and method for advanced treatment of papermaking wastewater - Google Patents
System and method for advanced treatment of papermaking wastewater Download PDFInfo
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- CN111620520A CN111620520A CN202010496304.7A CN202010496304A CN111620520A CN 111620520 A CN111620520 A CN 111620520A CN 202010496304 A CN202010496304 A CN 202010496304A CN 111620520 A CN111620520 A CN 111620520A
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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
- C02F1/52—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
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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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
- C02F2001/007—Processes including a sedimentation step
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- 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
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
- C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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Abstract
The invention relates to the technical field of sewage treatment, in particular to a system and a method for advanced treatment of papermaking sewage. The system comprises a pretreatment system, an anaerobic treatment system, an aerobic treatment system and a deep treatment system which are sequentially connected through pipelines from upstream to downstream, wherein a water outlet of the aerobic treatment system is also connected with a water inlet of the pretreatment system through a pipeline. A part of effluent of the aerobic treatment system flows back to the pretreatment system, so that the water inflow of the anaerobic treatment system can be effectively increased, and the influent COD and TN concentrations of the anaerobic treatment system are reduced, thereby reducing the water inflow load of the anaerobic treatment system, ensuring that the anaerobic treatment system is always in the optimal reaction condition, improving the COD removal rate of the anaerobic treatment system, reducing the treatment pressure of the aerobic treatment system, and improving the treatment efficiency of the papermaking sewage on the basis of saving the cost.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a system and a method for advanced treatment of papermaking sewage.
Background
Since 2017, the policies related to waste paper import in China are continuously introduced, and the waste paper import control is increasingly strict. In 7 months in 2017, the state department issues an implementation scheme for reforming a system for forbidding foreign garbage entry to promote solid waste import management, the solid waste import management is strengthened, in 12 months in the same year, the environmental protection department issues an imported waste paper environmental protection management regulation and a solid waste environmental protection management regulation for limiting import to be used as raw materials, the waste paper import is regulated, and the 'forbidding all import solid wastes before 2020' is mentioned at the end of 2018. The issuing of the waste paper import restriction brings huge influence to waste paper papermaking, the reduction of the amount of imported waste paper leads to the rapid increase of the consumption of domestic waste paper raw materials, and compared with the imported waste paper raw materials, the domestic waste paper raw materials have low yield and more pollutants, so the pollutants in the domestic waste paper papermaking sewage are increased obviously, and the sewage treatment difficulty and the sewage treatment cost are increased obviously.
The currently common papermaking sewage treatment system comprises a pretreatment system (namely a physical treatment method), an anaerobic and aerobic treatment system (namely a biochemical treatment method) and a deep treatment system (namely a chemical treatment method), wherein the drainage of a papermaking workshop firstly enters the pretreatment system, the pollutants can be reduced by only 10% through filtration and natural sedimentation in the pretreatment system, and then the sewage enters the anaerobic treatment system, according to the design indexes of the current domestic and foreign anaerobic treatment systems, the anaerobic treatment system has definite standard requirements on the Chemical Oxygen Demand (COD) of the inlet water, the COD concentration is not higher than 3500mg/L, and the high COD concentration can cause the fast death of biological bacteria in the anaerobic treatment system, so that the whole anaerobic treatment system is collapsed. In addition, the Total Nitrogen (TN) in the papermaking wastewater is mainly treated by the aerobic treatment system, but the capability of the aerobic treatment system for treating the total nitrogen is limited, and the removal rate is generally 60%.
As the pollutants in the domestic waste paper papermaking sewage are obviously increased, the cost is obviously increased when the domestic waste paper papermaking sewage is treated by the commonly used papermaking sewage treatment system at present, and the treated sewage can not be guaranteed to reach the drainage standard.
Disclosure of Invention
One of the objectives of the present invention is to provide a system for advanced treatment of papermaking wastewater, which not only makes the treated papermaking wastewater meet the national discharge standard, but also can greatly reduce the wastewater treatment cost.
The second purpose of the present invention is to provide a method for advanced treatment of papermaking wastewater, which can not only make the treated papermaking wastewater meet the national discharge standard, but also greatly reduce the wastewater treatment cost.
In order to achieve one of the purposes, the invention adopts the following technical scheme:
the utility model provides a papermaking sewage advanced treatment system, includes from the upper reaches to low reaches and loops through pipe connection's pretreatment system, anaerobic treatment system, good oxygen processing system and advanced treatment system, pretreatment system's water inlet is connected with the inlet tube, and papermaking sewage warp the inlet tube gets into pretreatment system, good oxygen processing system's delivery port still through the pipeline with pretreatment system's water inlet is connected, advanced treatment system's delivery port is connected with and sinks the pond eventually, the delivery port that sinks the pond eventually is connected with the outlet pipe, the delivery port of outlet pipe accesss to sewage discharge port.
In the technical scheme, the pretreatment system comprises a primary sedimentation tank, an adjusting tank and an acidification tank which are sequentially connected, the anaerobic treatment system comprises an anaerobic reactor, the aerobic treatment system comprises an aerobic aeration tank and a secondary sedimentation tank which are sequentially connected, a water inlet pipe is connected with a water inlet of the primary sedimentation tank, papermaking sewage enters the primary sedimentation tank through the water inlet pipe, a water outlet of the acidification tank is connected with a water inlet of the anaerobic reactor, a water outlet of the anaerobic reactor is connected with a water inlet of the aerobic aeration tank, and a water outlet of the secondary sedimentation tank is respectively connected with a water inlet of the adjusting tank and a water inlet of the advanced treatment system through pipelines.
In the technical scheme, the primary sedimentation tank, the secondary sedimentation tank and the final sedimentation tank are respectively provided with a sludge discharge port, and the anaerobic reactor is provided with a methane discharge port.
In the technical scheme, the acidification tank is provided with a nutrient salt feeding port.
In the technical scheme, the advanced treatment system is provided with an alkali adding port, an acid adding port, a reactant adding port and a flocculating agent adding port.
In order to achieve the second purpose, the invention adopts the following technical scheme:
the deep treatment method of the papermaking sewage is provided, the deep treatment system of the papermaking sewage is adopted to carry out deep treatment on the sewage, and the deep treatment method comprises the following steps:
step one, introducing papermaking sewage into a pretreatment system for pretreatment;
introducing effluent of the pretreatment system into an anaerobic treatment system for anaerobic treatment;
step three, introducing effluent of the anaerobic treatment system into an aerobic treatment system for aerobic treatment;
returning a part of the effluent of the aerobic treatment system to the pretreatment system, and introducing the other part of the effluent into the advanced treatment system for advanced treatment;
and step five, introducing the effluent of the advanced treatment system into a final sedimentation tank for sludge-water sedimentation separation, discharging sludge from a sludge discharge port of the final sedimentation tank, and discharging the effluent of the final sedimentation tank through a sewage discharge port.
In the technical scheme, in the first step, papermaking sewage is introduced into the primary sedimentation tank for sludge-water separation, sludge is discharged from a sludge discharge port of the primary sedimentation tank, the sewage enters the acidification tank from a water outlet of the primary sedimentation tank through the regulating tank, and urea and phosphate fertilizer are added into the acidification tank to hydrolyze and acidify the sewage.
In the technical scheme, in the second step, the COD of the effluent of the acidification tank is less than or equal to 3500mg/L, TN and less than or equal to 30mg/L, the effluent of the acidification tank enters an anaerobic reactor to carry out anaerobic treatment on the sewage, the flow velocity of the sewage in the anaerobic reactor is 4-8 m/s so as to remove more than 80% of the COD in the sewage, and the methane generated in the anaerobic reactor is discharged from a methane discharge port.
In the technical scheme, in the third step, effluent of the anaerobic reactor is introduced into an aerobic aeration tank for aerobic treatment to obtain sewage with COD (chemical oxygen demand) less than or equal to 120mg/L, and then the sewage enters a secondary sedimentation tank for sludge-water separation, and sludge is discharged from a sludge discharge port of the secondary sedimentation tank.
In the technical scheme, in the fourth step, one part of the effluent of the secondary sedimentation tank flows back to the regulating tank, the amount of the returned sewage is 35-45% of the total amount of the sewage in the regulating tank, the other part of the effluent enters the advanced treatment system, and sulfuric acid, ferrous sulfate, hydrogen peroxide, liquid alkali and an anionic polyacrylamide flocculant are sequentially added into the advanced treatment system to carry out advanced treatment on the sewage.
The invention has the beneficial effects that:
(1) the invention provides a papermaking sewage advanced treatment system, which comprises a pretreatment system, an anaerobic treatment system, an aerobic treatment system and an advanced treatment system which are sequentially connected through a pipeline from upstream to downstream, wherein a water inlet pipe is connected to a water inlet of the pretreatment system, papermaking sewage enters the pretreatment system through the water inlet pipe, a water outlet of the aerobic treatment system is also connected with the water inlet of the pretreatment system through the pipeline, a water outlet of the advanced treatment system is connected with a final sedimentation tank, a water outlet of the final sedimentation tank is connected with a water outlet pipe, and a water outlet of the water outlet pipe leads to a sewage discharge port. This system is through partly play water reflux to pretreatment systems with aerobic treatment system, can effectively increase anaerobic treatment system's inflow, reduces anaerobic treatment system's COD and TN concentration of intaking to reduce anaerobic treatment system's the load of intaking, guarantee that anaerobic treatment system is in optimum reaction condition all the time, improve anaerobic treatment system's COD clearance, reduce aerobic treatment system's treatment pressure, improve papermaking sewage's treatment effeciency on the basis of practicing thrift the cost.
(2) According to the papermaking sewage advanced treatment method provided by the invention, by means of refluxing a part of effluent of the aerobic treatment system to the pretreatment system, the water inlet load of the pretreatment system is reduced, the water inlet load of the anaerobic treatment system is further reduced, the anaerobic treatment system is ensured to be in an optimal reaction condition, the removal rate of COD in sewage is enabled to reach more than 80%, meanwhile, the increase of sludge in the anaerobic treatment system is improved, and the output of biogas is improved for production and living.
(3) Compared with the prior art, the papermaking sewage advanced treatment method can effectively reduce the water inlet load of the aerobic treatment system, and compared with the prior art, under the same aeration quantity, the COD removal rate of the sewage of the aerobic treatment system reaches over 75 percent, the COD removal rate is over 10 percent higher than that of the prior art, the growth of aerobic sludge can be stabilized, and the aerobic sludge treatment cost is saved.
(4) The papermaking sewage advanced treatment method provided by the invention can ensure that the sludge is stably increased and the sludge treatment cost is reduced while the sewage treatment load is reduced, so that the treatment cost of the papermaking sewage is greatly reduced, and the treated sewage meets the national discharge standard.
Drawings
FIG. 1 is a schematic view of an advanced treatment system for papermaking wastewater according to the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, a papermaking sewage advanced treatment system is provided, which comprises a pretreatment system, an anaerobic treatment system, an aerobic treatment system and an advanced treatment system which are sequentially connected from upstream to downstream through a pipeline, wherein a water outlet of the advanced treatment system is connected with a final sedimentation tank, a water outlet of the final sedimentation tank is connected with a water outlet pipe, a water outlet of the water outlet pipe leads to a sewage discharge port, a water inlet of the pretreatment system is connected with a water inlet pipe, papermaking sewage enters the pretreatment system through the water inlet pipe, then is sequentially subjected to anaerobic treatment and aerobic treatment through the anaerobic treatment system, then enters the advanced treatment system for advanced treatment, finally is subjected to sludge-water separation through the final sedimentation tank, and is discharged from the sewage discharge port through the water outlet pipe. The water outlet of the aerobic treatment system is also connected with the water inlet of the pretreatment system through a pipeline so as to reduce the water inlet load of the pretreatment system and reduce the COD and TN concentrations of inlet water.
In this embodiment, the pretreatment system includes the preliminary sedimentation tank, the equalizing basin and the acidizing tank that connect gradually, and anaerobic treatment system includes anaerobic reactor, and aerobic treatment system includes aerobic aeration tank and the secondary sedimentation tank that connects gradually, and the inlet tube is connected to the water inlet of preliminary sedimentation tank, and the water inlet of anaerobic reactor is connected to the delivery port of acidizing tank, and the water inlet of aerobic aeration tank is connected to the delivery port of anaerobic reactor, and the delivery port of secondary sedimentation tank passes through the pipeline and is connected with the water inlet of equalizing basin and the water inlet of advanced treatment system respectively. The papermaking sewage enters a primary sedimentation tank through a water inlet pipe, then enters an acidification tank through a regulating tank, then sequentially enters an anaerobic reactor, an aerobic aeration tank and a secondary sedimentation tank, one part of the effluent of the secondary sedimentation tank flows back to the regulating tank, the other part of the effluent enters an advanced treatment system for advanced treatment, finally, the effluent is subjected to sludge-water separation through a final sedimentation tank, and the sewage is discharged from a sewage discharge port through a water outlet pipe.
In this embodiment, the primary sedimentation tank, the secondary sedimentation tank and the final sedimentation tank are respectively provided with a sludge discharge port, and the anaerobic reactor is provided with a methane discharge port.
In this embodiment, the acidification tank is provided with a nutrient salt feeding port for feeding urea and phosphate fertilizer to hydrolyze and acidify the sewage.
In this embodiment, the advanced treatment system is provided with an alkali adding port for adding liquid alkali, an acid adding port for adding sulfuric acid, a reactant adding port for adding ferrous sulfate and hydrogen peroxide, and a flocculant adding port for adding a flocculant.
The deep treatment method of the papermaking sewage, which adopts the deep treatment system of the papermaking sewage to carry out deep treatment on the sewage, comprises the following steps:
step one, introducing papermaking sewage into a primary sedimentation tank for sludge-water separation, discharging sludge from a sludge discharge port of the primary sedimentation tank, introducing the sewage into an adjusting tank from a water outlet of the primary sedimentation tank, wherein COD (chemical oxygen demand) of the sewage in the adjusting tank is more than or equal to 4000mg/L, pH and more than or equal to 6.5, and Fe2+More than or equal to 1.0mg/L, TN mg/L and more than or equal to 35mg/L, then the effluent of the adjusting tank enters an acidification tank, and urea and phosphate fertilizer are added into the acidification tank to carry out hydrolytic acidification on the sewage;
step two, discharging from the acidification tankWater COD less than or equal to 3500mg/L, TN less than or equal to 30mg/L, pH less than or equal to 6.5, Fe2+The effluent of the acidification tank enters an anaerobic reactor to carry out anaerobic treatment on the sewage, the flow velocity of the sewage in the anaerobic reactor is 6m/s to remove 84 percent of COD in the sewage, the COD of the effluent of the anaerobic reactor is less than or equal to 550mg/L, and the biogas generated in the anaerobic reactor is discharged from a biogas discharge port;
introducing the effluent of the anaerobic reactor into an aerobic aeration tank for aerobic treatment to obtain sewage with COD (chemical oxygen demand) less than or equal to 120mg/L, wherein the COD removal rate of the sewage in the aerobic aeration tank is up to 78%, then, introducing the sewage into a secondary sedimentation tank for sludge-water separation, and discharging sludge from a sludge discharge port of the secondary sedimentation tank;
step four, returning one part of the effluent of the secondary sedimentation tank to the regulating tank, wherein the amount of the returned effluent is 40% of the total amount of the effluent of the regulating tank, feeding concentrated sulfuric acid into the advanced treatment system to regulate the pH of the effluent to acidity, then adding ferrous sulfate and hydrogen peroxide to carry out advanced treatment on the effluent through catalytic oxidation reaction, then adding caustic soda liquid to regulate the pH of the effluent back to neutrality or alkalinity, and then adding a flocculating agent to carry out flocculation reaction to complete the whole advanced treatment process;
and step five, introducing the effluent of the advanced treatment system into a final sedimentation tank for sludge-water sedimentation separation, discharging sludge from a sludge discharge port of the final sedimentation tank, and discharging the effluent of the final sedimentation tank through a sewage discharge port.
Compared with the prior art, the method has the advantages that part of the effluent of the aerobic treatment system flows back to the pretreatment system, so that the water content in the sewage of the pretreatment system is increased, and the concentrations of COD and TN in the sewage are relatively reduced, so that the water inlet load of the anaerobic treatment system is reduced, the anaerobic treatment system is always in the optimal reaction condition, the COD removal rate of the anaerobic treatment system is increased, the COD removal rate reaches over 80 percent, the sludge growth in the anaerobic treatment system is increased, and the output of biogas is increased.
Compared with the prior art, the treatment method in the embodiment can reduce the sewage treatment pressure of the aerobic treatment system, and compared with the prior art, under the same aeration quantity, the COD removal rate of the sewage of the aerobic treatment system in the embodiment reaches over 75 percent, the COD removal rate is over 10 percent higher than that of the prior art, the growth of aerobic sludge can be stabilized, and the aerobic sludge treatment cost is saved
According to the papermaking sewage advanced treatment method, the sewage treatment load is reduced, the sludge can be ensured to be stably increased, the sludge treatment cost is reduced, the papermaking sewage treatment cost is greatly reduced, and the treated sewage meets the national discharge standard.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The deep treatment system for papermaking sewage is characterized in that: including from the upper reaches to low reaches loop through pipe connection's pretreatment systems, anaerobic treatment system, good oxygen processing system and degree of depth processing system, pretreatment systems's water inlet is connected with the inlet tube, and papermaking sewage warp the inlet tube gets into pretreatment systems, good oxygen processing system's delivery port still through the pipeline with pretreatment systems's water inlet is connected, degree of depth processing system's delivery port is connected with and sinks the pond eventually, sink the delivery port in pond eventually and be connected with the outlet pipe, the delivery port of outlet pipe accesss to sewage discharge port.
2. The deep treatment system for papermaking wastewater according to claim 1, characterized in that: the pretreatment system comprises a primary sedimentation tank, an adjusting tank and an acidification tank which are sequentially connected, the anaerobic treatment system comprises an anaerobic reactor, the aerobic treatment system comprises an aerobic aeration tank and a secondary sedimentation tank which are sequentially connected, a water inlet pipe is connected with a water inlet of the primary sedimentation tank, papermaking sewage enters the primary sedimentation tank through the water inlet pipe, a water outlet of the acidification tank is connected with a water inlet of the anaerobic reactor, a water outlet of the anaerobic reactor is connected with a water inlet of the aerobic aeration tank, and a water outlet of the secondary sedimentation tank is respectively connected with a water inlet of the adjusting tank and a water inlet of the deep treatment system through pipelines.
3. The deep treatment system for papermaking wastewater according to claim 2, characterized in that: the primary sedimentation tank, the secondary sedimentation tank and the final sedimentation tank are respectively provided with a sludge discharge port, and the anaerobic reactor is provided with a methane discharge port.
4. The deep treatment system for papermaking wastewater according to claim 2, characterized in that: the acidification tank is provided with a nutrient salt feeding port.
5. The deep treatment system for papermaking wastewater according to claim 1, characterized in that: the advanced treatment system is provided with an alkali adding port, an acid adding port, a reactant adding port and a flocculating agent adding port.
6. A papermaking sewage advanced treatment method is characterized in that: the advanced treatment system for the papermaking wastewater, which is used for carrying out advanced treatment on the wastewater, comprises the following steps:
step one, introducing papermaking sewage into a pretreatment system for pretreatment;
introducing effluent of the pretreatment system into an anaerobic treatment system for anaerobic treatment;
step three, introducing effluent of the anaerobic treatment system into an aerobic treatment system for aerobic treatment;
returning a part of the effluent of the aerobic treatment system to the pretreatment system, and introducing the other part of the effluent into the advanced treatment system for advanced treatment;
and step five, introducing the effluent of the advanced treatment system into a final sedimentation tank for sludge-water sedimentation separation, discharging sludge from a sludge discharge port of the final sedimentation tank, and discharging the effluent of the final sedimentation tank through a sewage discharge port.
7. The advanced treatment method for papermaking wastewater according to claim 6, characterized in that: in the first step, papermaking sewage is introduced into a primary sedimentation tank for sludge-water separation, sludge is discharged from a sludge discharge port of the primary sedimentation tank, the sewage enters an acidification tank from a water outlet of the primary sedimentation tank through an adjusting tank, and urea and phosphate fertilizer are added into the acidification tank to hydrolyze and acidify the sewage.
8. The advanced treatment method for papermaking wastewater according to claim 6, characterized in that: in the second step, the COD of the effluent of the acidification tank is less than or equal to 3500mg/L, TN and less than or equal to 30mg/L, the effluent of the acidification tank enters an anaerobic reactor to carry out anaerobic treatment on the sewage, the flow velocity of the sewage in the anaerobic reactor is 4-8 m/s to remove more than 80% of the COD in the sewage, and the methane generated in the anaerobic reactor is discharged from a methane discharge port.
9. The deep treatment system for papermaking wastewater according to claim 6, wherein: and in the third step, the effluent of the anaerobic reactor is introduced into an aerobic aeration tank for aerobic treatment to obtain sewage with COD (chemical oxygen demand) less than or equal to 120mg/L, then the sewage enters a secondary sedimentation tank for sludge-water separation, and the sludge is discharged from a sludge discharge port of the secondary sedimentation tank.
10. The deep treatment system for papermaking wastewater according to claim 6, wherein: in the fourth step, one part of the effluent of the secondary sedimentation tank flows back to the regulating tank, the amount of the backflow sewage is 35-45% of the total amount of the sewage of the regulating tank, the other part of the effluent enters an advanced treatment system, and sulfuric acid, ferrous sulfate, hydrogen peroxide, liquid alkali and an anionic polyacrylamide flocculant are sequentially added into the advanced treatment system to carry out advanced treatment on the sewage.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017161640A1 (en) * | 2016-03-22 | 2017-09-28 | 中国环境科学研究院 | Method for treating and recycling organic wastewater and apparatus |
| CN110422972A (en) * | 2019-09-05 | 2019-11-08 | 中山联合鸿兴造纸有限公司 | A kind of process of aerobic moisture section reuse |
| CN110668649A (en) * | 2019-10-25 | 2020-01-10 | 陕西武功东方纸业集团东鹏造纸有限公司 | Corrugated paper pulping wastewater treatment system and process |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017161640A1 (en) * | 2016-03-22 | 2017-09-28 | 中国环境科学研究院 | Method for treating and recycling organic wastewater and apparatus |
| CN110422972A (en) * | 2019-09-05 | 2019-11-08 | 中山联合鸿兴造纸有限公司 | A kind of process of aerobic moisture section reuse |
| CN110668649A (en) * | 2019-10-25 | 2020-01-10 | 陕西武功东方纸业集团东鹏造纸有限公司 | Corrugated paper pulping wastewater treatment system and process |
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Application publication date: 20200904 |