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 an integrated treatment device for polluted river and lake water, which belong to the field of sewage treatment. The device comprises a water inlet pipe (1), a mixing tank (2), a flocculation basin (3), a sediment tank (4), a flocculant medicine dissolving tank (5), a magnetic powder adding device (6), a coagulant aid medicine dissolving tank (7), a sludge return pipe (8), a magnetic separator (9), a magnetic powder recycling pipe (10), a water inlet tank (11), a water inlet pump (12), an anoxia tank (13), an aerobic tank (14), an air compressor (15), an air flow meter (16), a water outlet tank (17) and a mixed liquid return pump (18). The integrated treatment method uses a magnetic coagulation treatment technique and a carbon fiber ecological grass biological treatment technique in linkage, can obviously improve sensory index of polluted river and lake water, and reduces the content of organic pollutants and nitrogen and phosphorus pollutants. In practical application, the method and the device have the advantages of being small in occupancy, good in treated water quality, low in treatment cost and the like.

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. a contaminated river lake water integrated treating device is characterized in that comprising: water inlet pipe (1), mixing pit (2), flocculation basin (3), settling tank (4), flocculation agent medicine dissolving tank (5), magnetic throwing device (6), coagulant aids medicine dissolving tank (7), mud return line (8), magnetic separator (9), magnetic TFL (10), suction sump (11), intake pump (12), anoxic pond (13), Aerobic Pond (14), air compressor machine (15), air flowmeter (16), outlet sump (17) and mixed-liquor return pump (18); Flocculation agent medicine dissolving tank (5) is connected with mixing pit (2) through water inlet pipe (1); Mixing pit (2) is equipped with stirring rake, is connected with flocculation basin (3) through sluice gate; Magnetic separator (9) is connected with magnetic TFL (10), magnetic throwing device (6), and magnetic throwing device (6) is installed in the upper front end of mixing pit (2); Coagulant aids medicine dissolving tank (7) is connected with flocculation basin (3); Flocculation basin (3) is equipped with stirring rake, is connected with settling tank (4) through the pool wall flashboard; Settling tank (4) bottom is installed the diving sludge reflux pump and is connected with mud return line (8), magnetic separator (9); Settling tank (4) is connected with suction sump (11), and suction sump (11) links to each other with anoxic pond (13) through intake pump (12); Anoxic pond (13) connects the mixed-liquor return pipe, and inside is arranged the ecological grass of thomel from top to bottom, is connected with Aerobic Pond (14) through the bottom flashboard; Aerobic Pond (14) inside is arranged the ecological grass of thomel from top to bottom, and is located at the outer air compressor machine (15) of Aerobic Pond and is connected with air flowmeter (16); Aerobic Pond (14) is the Aerobic Pond more than 2 that is cascaded, and is connected with the mixed-liquor return pipe, and the mixed-liquor return pipe links to each other with the mixed-liquor return pipe of anoxic pond (13) through mixed-liquor return pump (18); Aerobic Pond (14) is connected with outlet sump (17).

2. application rights requires the method for 1 said a kind of contaminated river lake water integrated treating device; It is characterized in that: the coagulant aids in flocculation agent in the flocculation agent medicine dissolving tank (5) and the coagulant aids medicine dissolving tank (7) drops into mixing pit (2) and flocculation basin (3) respectively, and dosage is as the criterion with the V class that the coagulation process water outlet reaches among the water environment quality standard GB3838-2002; Magnetic throwing device (6) drops into mixing pit (2) with the middle magnetic that reclaims of magnetic separator (9), and magnetic concentration is not less than 150mg/L; After stirring action in the mixing pit (2) is realized the thorough mixing of magnetic and flocculation agent, flow into flocculation basin (3) through sluice gate; The sewage that flows in coagulant aids in the coagulant aids medicine dissolving tank (7) and the mixing pit (2) is realized the thorough mixing cohesion under the stirring action in flocculation basin (3), forming with the magnetic is the magnetic flco of cohesion core; Magnetic flco mixed solution flows into settling tank (4) through sluice gate; Magnetic flco rapid precipitation is carried out the magnetic Separation and Recovery after the diving sludge reflux pump gets into magnetic separator (9) through mud return line (8), and the magnetic of recovery gets into magnetic throwing device (6) again through magnetic TFL (10); The supernatant that produces through post precipitation in the settling tank (4) flows into suction sump (11) through submersible pump and pipeline, through intake pump (12) the magnetic flocculation water outlet is promoted to anoxic pond (13); The dissolved oxygen content of anoxic pond (13) is lower than 1mg/L, and the denitrifying bacteria in it utilizes organism and the nitrate salt in the backflow mixed liquor in the water to carry out denitrification, simultaneously the carbon elimination denitrogenation; Anoxic pond (13) links to each other with Aerobic Pond (14) through the bottom sluice gate, and the water flow by gravity gets into Aerobic Pond; When sewage got into Aerobic Pond (14), dissolved oxygen content wherein was not less than 3mg/L, makes the autotrophic type nitrobacteria under the competent condition of dissolved oxygen, ammonia nitrogen is converted into nitrate nitrogen, realized the purpose of denitrogenation; The microbial consumption that possesses the organic matter degradation ability is simultaneously fallen the organic purpose of carbon source realization removal in the former water; Aerobic Pond (14) is connected with anoxic pond (13) through mixed-liquor return pump (18), and with a part of mixed-liquor return to anoxic pond (13), return current ratio of the mixed liquid is between 50%～300%; Aerobic Pond (14) links to each other with outlet sump (17) through rising pipe, is discharged in the water drain water outlet after handling or the lake, river.

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