CN102627375A - Integrated treatment method and integrated treatment device for polluted river and lake water - Google Patents

Abstract

The invention relates to an integrated treatment method and device for polluted river and lake water, belonging to the field of sewage treatment. Water inlet pipe (1), mixing tank (2), flocculation tank (3), sedimentation tank (4), flocculant dissolving tank (5), magnetic powder dosing device (6), coagulant dissolving tank (7) , sludge return pipe (8), magnetic separator (9), magnetic powder recovery pipe (10), water inlet pool (11), water inlet pump (12), anoxic pool (13), aerobic pool (14), empty Compressor (15), air flow meter (16), outlet pool (17) and mixed liquid return pump (18). This technology uses magnetic coagulation treatment technology combined with carbon fiber ecological grass biological treatment technology, which can significantly improve the sensory indicators of polluted river and lake water and reduce the content of organic pollutants and nitrogen and phosphorus pollutants. In practical application, this technology has the advantages of small footprint, good water quality and low treatment cost.

Description

A method and device for integrated treatment of polluted river and lake water

technical field

The invention relates to an integrated treatment technology for polluted river and lake water and a treatment device thereof, belonging to the field of sewage treatment.

Background technique

In recent years, eutrophication events in rivers and lakes have occurred frequently in my country. Nitrogen and phosphorus are the main elements of eutrophication. For this reason, the country has introduced more stringent surface water standards. The latest "National Surface Water Environmental Quality Standard GB3838-2002" stipulates that the discharge standards for Class IV water bodies are COD _Cr ≤30mg/L, NH ₃ -N ≤1.5mg/L, and total phosphorus ≤0.3mg/L. The pressure to keep the water quality of rivers and lakes up to standard is also increasing due to the pollution of surface water bodies due to the discharge of sewage along the rivers and lakes. Therefore, by combining the magnetic coagulation treatment technology with the carbon fiber ecological grass (carbon fiber bundle) water treatment method, a new treatment device is developed to achieve the purpose of purifying water quality and inhibiting the eutrophication trend of river and lake water. In practical application, this technology has the advantages of small footprint, good water quality and low treatment cost.

The combination of magnetic coagulation treatment technology and carbon fiber ecological grass water treatment method is a new river and lake water treatment technology. Due to the fact that the pollution of rivers and lakes in my country is becoming more and more serious at this stage, coupled with the high energy consumption and high construction costs of traditional physical and chemical treatment methods and existing biological treatment equipment, there is an urgent need for new high-efficiency, energy-saving, and small-occupied treatment equipment. , and related technology research and development. Therefore, the invention of this technology can provide a practical, efficient, energy-saving and usable new research direction in the field of water pollution control.

Contents of the invention

In the present invention, the magnetic powder is added into the coagulation process, which can make the floc wrap more tightly, and the floc sedimentation rate is faster, and can effectively improve the removal effect of the traditional coagulation process on suspended matter and phosphorus pollutants in river and lake water, and also It can improve the sensory indicators of the water body; the carbon fiber ecological grass water treatment device has a fast microbial film formation, and can quickly reach a stable working state to make the effluent meet the standard. The combination of the two can effectively achieve the water quality purification goals of degradation of organic matter, denitrification and phosphorus removal and improvement of sensory indicators in polluted river and lake water.

The integrated treatment device for polluted river and lake water includes: water inlet pipe 1, mixing tank 2, flocculation tank 3, sedimentation tank 4, flocculant dissolving tank 5, magnetic powder dosing device 6, coagulant dissolving tank 7, sludge return pipe 8. Magnetic separator 9, magnetic powder recovery pipe 10, water inlet pool 11, water inlet pump 12, anoxic pool 13, aerobic pool 14: at least 2 pools in series, air compressor 15, air flow meter 16, water outlet pool 17 And mixed solution return pump 18. The device is characterized in that: the flocculant dissolving tank 5 is connected to the mixing tank 2 through the water inlet pipe 1; the mixing tank 2 is equipped with a stirring paddle, and is connected to the flocculation tank 3 through the gate; the magnetic separator 9 is connected to the magnetic powder recovery pipe 10, and the magnetic powder dosing device 6 connection, the magnetic powder dosing device 6 is installed on the upper front end of the mixing tank 2; the coagulant aid dissolving tank 7 is connected to the flocculation tank 3; A sludge return pump is installed at the bottom of the pool 4, and is connected with the sludge return pipe 8 and the magnetic separator 9; the sedimentation tank 4 is connected with the water inlet pool 11, and the water inlet pool 11 is connected with the anoxic pool 13 through the water inlet pump 12; the anoxic pool 13 Connect the mixed liquid return pipe, arrange carbon fiber ecological grass from top to bottom inside, and connect with the aerobic pool 14 through the bottom ram; The machine 15 is connected with the air flow meter 16; the aerobic pool 14 is connected with more than two aerobic pools in series, and is connected with a mixed liquid return pipe, and the mixed liquid return pipe is connected with the mixed liquid return pipe of the anoxic pool 13 through the mixed liquid return pump 18 ; The aerobic pool 14 is connected with the outlet pool 17 .

The working mode of the reaction device: the flocculant in the flocculant dissolving tank 5 and the coagulant aid in the coagulant dissolving tank 7 are put into the mixing tank 2 and the flocculation tank 3 respectively, and the dosage is based on the effluent of the coagulation process to reach the surface water environment Class V in the quality standard GB3838-2002 shall prevail; the concentration of magnetic powder in the mixing tank 2 shall not be lower than 150mg/L; the mixed solution of magnetic flocs shall flow into the sedimentation tank 4, and the magnetic flocs shall be refluxed through sludge after rapid precipitation and passed through magnetic separation The device 9 reclaims the magnetic powder, and re-enters the magnetic powder dosing device 6; in the sedimentation tank 4, the supernatant after precipitation flows into the water inlet pool 11, and the supernatant liquid is lifted to the anoxic pool 13 by the water inlet pump 12; The denitrifying bacteria can decarbonize and denitrify at the same time; the sewage gravity flows into the aerobic pool 14, where the autotrophic nitrifying bacteria achieve the purpose of denitrification under the condition of sufficient dissolved oxygen, and the microorganisms with the ability to degrade organic matter can achieve the purpose of removing organic matter ; The aerobic pool 14 returns a part of the mixed solution to the anoxic pool 13, and is connected with the outlet pool 17.

The integrated treatment method and device for polluted river and lake water can be used to improve the existing physicochemical and biochemical treatment processes for polluted river and lake water. The river and lake water treated by this technology has lower concentrations of suspended solids, biochemical oxygen demand, nitrogen and phosphorus, and the sensory indicators of the effluent have been greatly improved. Due to the input of magnetic powder, the flocs produced by coagulation are denser, the sedimentation rate is faster, and the reserves per unit time are greatly increased, which saves the area of the device; the carbon fiber ecological grass is used for the upgrading of the existing sewage treatment plant, and because There is no need to set up a sludge treatment device, which can greatly reduce the cost of infrastructure.

Description of drawings

Fig. 1 is a schematic diagram of an integrated treatment method and device for polluted river and lake water in the present invention.

In the figure: 1 water inlet pipe, 2 mixing tank, 3 flocculation tank, 4 sedimentation tank, 5 flocculant dissolving tank, 6 magnetic powder dosing device, 7 coagulant dissolving tank, 8 sludge return pipe, 9 magnetic separator , 10 magnetic powder recovery pipe, 11 water inlet pool, 12 water inlet pump, 13 anoxic pool, 14 aerobic pool: at least 2 pools need to be connected in series, 15 air compressor, 16 air flow meter, 17 water outlet pool and 18 mixed liquid return pump .

Detailed ways

The working mode of the reaction device: the flocculant in the flocculant dissolving tank 5 and the coagulant aid in the coagulant dissolving tank 7 are put into the mixing tank 2 and the flocculation tank 3 respectively, and the dosage is based on the effluent of the coagulation process to reach the surface water environment Class V in the quality standard GB3838-2002 shall prevail; the magnetic powder recovered from the magnetic powder dosing device 6 and the magnetic separator 9 is put into the mixing tank 2, and the concentration of the magnetic powder shall not be lower than 150mg/L. The stirring effect in the mixing tank 2 realizes the full mixing of the magnetic powder and the flocculant, and then flows into the flocculation tank 3 through the gate; Under the action, fully mixed and coagulated to form magnetic flocs with magnetic powder as the core of coagulation; the mixed liquid of magnetic flocs flows into the sedimentation tank 4 through the gate, and the magnetic flocs are rapidly precipitated and then enter the magnetic flocs through the sludge return pipe 8 through the submersible sludge return pump. Separator 9 performs magnetic powder separation and recovery, and the recovered magnetic powder enters the magnetic powder dosing device 6 again through the magnetic powder recovery pipe 10; the supernatant produced after sedimentation in the sedimentation tank 4 flows into the water inlet pool 11 through the submersible pump and pipeline, and passes through the water inlet pump 12 Lift the magnetic flocculation effluent to the anoxic pool 13; the dissolved oxygen content in the anoxic pool 13 is lower than 1mg/L, and the denitrifying bacteria in the anoxic pool 13 use the organic matter in the water and the nitrate in the reflux mixture to denitrify, and can simultaneously denitrify Carbon denitrification; the anoxic pool 13 is connected with the aerobic pool 14 through the bottom gate, and the water gravity flows into the aerobic pool; when the sewage enters the aerobic pool 14, the dissolved oxygen content in it is not less than 3mg/L, making the autotrophic Nitrifying bacteria convert ammonia nitrogen into nitrate nitrogen under the condition of sufficient dissolved oxygen to achieve the purpose of denitrification; at the same time, microorganisms with the ability to degrade organic matter consume the carbon source in the raw water to achieve the purpose of removing organic matter; the aerobic pool 14 passes the mixed liquid The reflux pump 18 is connected with the anoxic pool 13, and a part of the mixed solution is returned to the anoxic pool 13, and the reflux ratio of the mixed solution is between 50% and 300%; the aerobic pool 14 is connected with the water outlet pool 17 through an outlet pipe, and the treated The effluent is discharged into sewers or rivers and lakes.

The raw water quality is Tonghui River water in Beijing. The water quality is as follows: Turbidity 3-6NTU, COD40-60mg/L, NH ₃ -N 2-6mg/L, total phosphorus about 1. After the reactor treatment, the effluent turbidity is less than 0.5NTU, the removal rate is over 80%; the COD content is 4-6mg/L, the removal rate is over 90%; the NH ₃ -N content is less than 0.1mg/L, the removal rate It is above 95%; the total phosphorus in the effluent is less than 0.1mg/L, and the removal rate is above 90%. The effluent COD, ammonia nitrogen, and total phosphorus all meet the Class IV water body discharge standard of the "National Surface Water Environmental Quality Standard GB3838-2002". Urban river and lake water treatment.

This device is suitable for the upgrading and transformation of existing water treatment plants for denitrification and phosphorus removal and new treatment plants. The processing device has the characteristics of saving floor space, improving processing capacity, and the like.

Claims (2)

1. An integrated treatment device for polluted river and lake water, characterized in that it comprises: water inlet pipe (1), mixing tank (2), flocculation tank (3), settling tank (4), flocculant dissolving tank (5), Magnetic powder dosing device (6), coagulant dissolving tank (7), sludge return pipe (8), magnetic separator (9), magnetic powder recovery pipe (10), water inlet pool (11), water inlet pump (12 ), anoxic pool (13), aerobic pool (14), air compressor (15), air flow meter (16), outlet pool (17) and mixed liquid return pump (18); flocculant solvent pool ( 5) Connect to the mixing tank (2) through the water inlet pipe (1); the mixing tank (2) is equipped with a stirring paddle, and is connected to the flocculation tank (3) through the gate; the magnetic separator (9) is connected to the magnetic powder recovery pipe (10), The magnetic powder dosing device (6) is connected, and the magnetic powder dosing device (6) is installed on the upper front end of the mixing tank (2); the coagulant aid dissolving tank (7) is connected with the flocculation tank (3); There is a stirring paddle, which is connected to the sedimentation tank (4) through the gate plate of the pool wall; a submersible sludge return pump is installed at the bottom of the sedimentation tank (4) to connect with the sludge return pipe (8) and the magnetic separator (9); the sedimentation tank (4) ) is connected to the water inlet pool (11), and the water inlet pool (11) is connected to the anoxic pool (13) through the water inlet pump (12); the anoxic pool (13) is connected to the mixed liquid return pipe, and carbon fiber ecological grass is arranged inside , connected to the aerobic tank (14) through the bottom gate; the carbon fiber ecological grass is arranged from top to bottom inside the aerobic tank (14), and the air compressor (15) and air flow meter (16) located outside the aerobic tank connection; the aerobic tank (14) is more than 2 aerobic tanks connected in series, and is connected with a mixed solution return pipe, and the mixed solution return pipe is mixed by the mixed solution return pump (18) and the anoxic tank (13) The liquid return pipe is connected; the aerobic pool (14) is connected with the outlet pool (17). 2. the method for applying a kind of polluted river and lake water integrated treatment device described in claim 1 is characterized in that: the flocculant in the flocculant dissolving pool (5) and the coagulation aid in the coagulant aid dissolving pool (7) The agent is put into the mixing tank (2) and the flocculation tank (3) respectively, and the dosage is subject to the effluent of the coagulation process meeting the V category in the surface water environmental quality standard GB3838-2002; the magnetic powder dosing device (6) and the magnetic separator The magnetic powder recovered in (9) is put into the mixing tank (2), and the concentration of the magnetic powder is not less than 150mg/L; the stirring action in the mixing tank (2) realizes the sufficient mixing of the magnetic powder and the flocculant, and then flows into the flocculation tank (3) through the gate. The coagulant in the coagulant aid dissolution tank (7) and the sewage flowing in the mixing tank (2) are fully mixed and coagulated under the stirring action in the flocculation tank (3), forming magnetic flocs with magnetic powder as the coagulation core The magnetic floc mixed liquid flows into the sedimentation tank (4) through the gate, and after the magnetic flocs are rapidly precipitated, the submerged sludge return pump passes through the sludge return pipe (8) and enters the magnetic separator (9) for magnetic powder separation and recovery. The recovered magnetic powder Re-enter the magnetic powder dosing device (6) through the magnetic powder recovery pipe (10); the supernatant produced after sedimentation in the sedimentation tank (4) flows into the water inlet pool (11) through the submersible pump and pipeline, and is discharged by the water inlet pump (12) The magnetic flocculation effluent is raised to the anoxic pool (13); the dissolved oxygen content in the anoxic pool (13) is lower than 1mg/L, and the denitrifying bacteria in the anoxic pool (13) use the organic matter in the water and the nitrate in the reflux mixture to denitrify, It can remove carbon and nitrogen at the same time; the anoxic pool (13) is connected to the aerobic pool (14) through the gate at the bottom, and the water flows into the aerobic pool by gravity; when the sewage enters the aerobic pool (14), the dissolved oxygen content in it is not low At 3mg/L, the autotrophic nitrifying bacteria can convert ammonia nitrogen into nitrate nitrogen under the condition of sufficient dissolved oxygen to achieve the purpose of denitrification; at the same time, the microorganisms with the ability to degrade organic matter can consume the carbon source in the raw water to achieve the purpose of removing organic matter Purpose: the aerobic tank (14) is connected with the anoxic tank (13) through the mixed solution return pump (18), and a part of the mixed solution is returned to the anoxic tank (13), and the mixed solution reflux ratio is between 50% and 300% The aerobic pond (14) is connected with the water outlet pond (17) through the outlet pipe, and the treated outlet water is discharged into the sewer or rivers and lakes.

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