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Method for pretreating organic wastewater

A technology for organic wastewater and pretreatment, which is applied in animal husbandry wastewater treatment, multi-stage water treatment, water/sewage treatment, etc. It can solve the problems of endangering livestock and human health, hindering the popularization and application of technology, and large volume of high-concentration wastewater. Improve the floc structure and density, improve the floc sedimentation performance, and strengthen the treatment effect

Inactive Publication Date: 2017-11-21
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High-solid organic wastewater contains high concentrations of pollutants. It is directly discharged into the water body without treatment, resulting in eutrophication; directly flowing into the land, causing soil compaction; pathogenic bacteria in wastewater will endanger livestock and human health
[0003] At present, my country generally adopts anaerobic / aerobic biological process to treat high-solids and high-concentration wastewater. This process combines the advantages of anaerobic and aerobic treatment to overcome the substandard anaerobic treatment and aerobic treatment. However, due to the low COD of anaerobic treatment effluent, it cannot meet the requirements of subsequent treatment for denitrification. It is often necessary to add additional carbon sources, which are difficult to control, and the amount of high-solid and high-concentration wastewater is large, and biological The high treatment cost and poor phosphorus removal effect hinder the popularization and application of this process

Method used

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  • Method for pretreating organic wastewater
  • Method for pretreating organic wastewater
  • Method for pretreating organic wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The preprocessing method of the present embodiment is as follows:

[0040] (1) Add Fe 3 o 4 With the magnetic seed as the main component, stir rapidly at a speed of 400r / min for 1min;

[0041] (2) Add flocculant PAC and stir rapidly at a speed of 300r / min for 1.5min;

[0042] (3) Add the coagulant PAM, first stir at a speed of 300r / min for 10s, and then stir at a speed of 70r / min for 110s;

[0043] (4) Drain and discharge mud after standing for 10 minutes.

[0044] After the livestock and poultry breeding wastewater in this example is pretreated, the COD has been reduced to 4150 mg / L, with a removal rate of 70.3%, and the total phosphorus has been reduced to 8 mg / L, with a removal rate of 95%.

Embodiment 2

[0046] The preprocessing method of the present embodiment is as follows:

[0047] (1) Add Fe 3 o 4 With magnetic seeds as the main component, stir rapidly at a speed of 350r / min for 80s;

[0048] (2) Add flocculant PAC and stir rapidly at a speed of 250r / min for 80s;

[0049] (3) Add the coagulant PAM, first stir at a speed of 250r / min for 15s, and then stir at a speed of 60r / min for 100s;

[0050] (4) Drainage and mud discharge after standing for 15 minutes.

[0051] After the livestock and poultry breeding wastewater in this example is pretreated, the COD removal rate is 61.7%, the total phosphorus is reduced to 12mg / L, the removal rate is 92.5%, and the floc volume is reduced by 45% compared with the ordinary coagulation process. Pretreated livestock and poultry farming wastewater such as figure 2 shown.

[0052] The contrast treatment method that only includes steps (1), (2) has loose flocs, and the pictures compared with the pretreatment methods that include steps ...

Embodiment 3

[0054] The preprocessing method of the present embodiment is as follows:

[0055] (1) Add Fe to the landfill leachate with high solid content and high concentration to be treated 3 o 4With magnetic seeds as the main component, stir rapidly at a speed of 370r / min for 80s;

[0056] (2) Add flocculant PAC and stir rapidly at a speed of 350r / min for 70s;

[0057] (3) Add the coagulant PAM, first stir at a speed of 200r / min for 15s, and then stir at a speed of 50r / min for 120s;

[0058] (4) Drainage and mud discharge after standing for 15 minutes.

[0059] After the livestock and poultry breeding wastewater in this embodiment is pretreated, the COD is reduced from 1885mg / L to 643mg / L, the removal rate is 65.9%, and the color of landfill leachate changes from dark brown to light.

[0060] In some other specific embodiments of the present invention, the speed of the fast stirring can also be other values ​​in the range of 150-400r / min, and the speed of the slow stirring can also ...

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Abstract

The invention discloses a method for pretreating organic wastewater. The method comprises the following steps: (1) adding a magnetic seed into organic wastewater to be treated, and quickly stirring for 1-2 minutes; (2) adding a flocculating agent, and quickly stirring for 1-2 minutes; (3) adding coagulant aid, quickly stirring for 5-30 seconds, and slowly stirring for 1-2 minutes; (4) standing to precipitate, draining and discharging slurry, wherein the speed of quickly stirring is 150-400r / min, and the speed of slow stirring is 30-80r / min. According to the method, heavy metal, antibiotic and other micropollutants can be removed by adding the magnetic seed to reinforce the coagulating process, so that high solid content, and the suspended solid content, COD concentration and total phosphorous concentration of high-concentration wastewater can be effectively reduced, and load of subsequent treatment units can be reduced.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, in particular, the invention relates to a method for pretreatment of organic wastewater. Background technique [0002] According to the data in the Bulletin of the First National Survey of Pollution Sources, my country’s livestock and poultry breeding industry produces 243 million tons of feces and 163 million tons of urine. % and 38%, livestock and poultry farming pollution has become the main source of agricultural pollution. Due to technical and economic reasons, the treatment rate of high-solids and high-concentration wastewater in my country is low, and it is even directly discharged into the environment without treatment. High-solid organic wastewater contains high concentrations of pollutants. It is directly discharged into the water body without treatment, resulting in eutrophication; directly flowing into the land, causing soil compaction; pathogenic bacteria in wastewater w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/12C02F101/30C02F103/20
CPCC02F1/488C02F1/5236C02F1/56C02F9/00C02F2001/007C02F2101/30C02F2103/20C02F2301/08
Inventor 陈梅雪陈彦霖郑利兵郁达伟张俊亚隋倩雯魏源送
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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