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Method for processing organic sewage

A treatment method and technology of organic sewage, applied in the directions of water/sewage multi-stage treatment, water/sludge/sewage treatment, magnetic field/electric field water/sewage treatment, etc., can solve the problem of cleaning magnetic particles, increasing operating costs, and no Good application and other issues, to achieve good economic and environmental benefits, high removal rate of organic matter, the effect of less dosage

Active Publication Date: 2013-05-22
GUANGDONG XINDAYU ENVIRONMENTAL PROTECTION TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, the magnetic separation technology has the following technical difficulties and limitations in the treatment of wastewater: the residual magnetism of the medium makes it difficult for the magnetic separation equipment to wash away the magnetic particles adsorbed by the magnetic accumulation medium when the system is backwashed, because it affects the next cycle. In order to improve the working efficiency, in order to improve the magnetic field gradient, it is necessary to choose a magnetic gathering medium with high magnetic saturation. There are certain technical difficulties in the selection of magnetic gathering medium, and it will increase the cost of operation.
[0011] Magnetic separation technology mainly uses the high specific gravity characteristics of magnetic powder. Under the action of coagulant and flocculant, flocs with high specific gravity are formed with pollutants and separated from wastewater, but the magnetization can break up macromolecular organic matter into The characteristics of small molecular organics have not been well utilized, and there are also problems of remanence and increased costs

Method used

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  • Method for processing organic sewage
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  • Method for processing organic sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A method for treating organic sewage, comprising the steps of:

[0043] (1) Cultivation and domestication of activated sludge;

[0044] The cultivation of the activated sludge is as follows: the activated sludge in the municipal sewage aerobic tank is used as the seed sludge, put into the aerobic tank described in step (4), and tap water is added to obtain a mixed solution, and then BOD is added. 5 : N: P is the nutrient source of 100:5:1. After 3 days of culture, the solution starts to turn yellow, and at the same time, blurred flocs appear; continue to culture and continue to add BOD 5 :N:P is a nutrient source of 100:5:1, once a day, after 5 days of cultivation, a large amount of foam appears and the smell is very strong, at this time, aeration should be used to maintain sufficient dissolved oxygen in the water; after 6 days of cultivation, the foam gradually disappears ,SV 30 Reaching about 90%, the sedimentation performance is poor, there are a small amount of am...

Embodiment 2

[0060] The method for treating organic sewage described in this example is basically the same as in Example 1, except that in step (1) during the cultivation of activated sludge, 1.5g / L of For iron oxide magnetic powder, the stirring speed is 50 rpm, the stirring time is 6 days, and the DO is controlled at 2 mg / L; during the aerobic treatment in step (4), the rotational speed is 70 rpm, and the dosage of magnetic powder is: Add 1.8g of iron oxide magnetic powder per liter of sewage in the aerobic pool.

[0061] For the sewage treatment method of the control group in this embodiment, refer to the control group in Example 1.

[0062] Get the sewage that COD is 120mg / L, after embodiment 2 is processed, the result shows: influent COD is 120mg / L, and effluent COD is 50mg / L, and promptly organic matter removal rate is 58%; And the influent COD of control group is in 120mg / L, the effluent COD is 75mg / L, that is, the removal rate of organic matter is 37.5%. The comparison shows that ...

Embodiment 3

[0065] The treatment method of organic sewage described in this example is basically the same as in Example 1, except that in step (1) during the cultivation of activated sludge, 2.5g / L of Iron oxide magnetic powder, the stirring speed is 120 rpm, the stirring time is 8 days, and the DO is controlled at 3 mg / L; during the aerobic treatment in step (4), the rotational speed is 140 rpm, and the dosage of magnetic powder is: Add 2.2g of iron oxide magnetic powder per liter of sewage in the aerobic pool.

[0066] For the sewage treatment method of the control group in this embodiment, refer to the control group in Example 1.

[0067] Get the sewage that COD is 160mg / L, after embodiment 3 is processed, the result shows: influent COD is 160mg / L, and effluent COD is 21mg / L, and promptly organic matter removal rate is 87%; And the influent COD of control group is in 160mg / L, the effluent COD is 75mg / L, that is, the removal rate of organic matter is 53%. The comparison shows that the ...

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Abstract

The invention discloses a method for processing organic sewage. The method comprises the following steps of: culturing and acclimating activated sludge, adding magnetic powder to mixed liquid after the activated sludge is matured, stirring for 6-8 days and ending culturing, wherein 1.5-2.5g of magnetic powder is added per liter of mixed liquid; enabling the sewage to enter a regulation pool; pumping the sewage to a pulse tank of an anaerobic pool for hydrolytic acidification; enabling the sewage to enter an aerobic pool for aerobic treatment; after the treatment, enabling outlet water to enter a secondary sedimentation pool, and enabling sludge to return to the aerobic pool; and directly discharge outlet water of the secondary sedimentation pool if the COD (Chemical Oxygen Demand) of the outlet water of the secondary sedimentation pool is less than 50 mg / L, enabling the outlet water of the secondary sedimentation pool to enter a coagulation and flocculation pool and then enter a final sedimentation pool if the COD is more than 50 mg / L, draining outlet water, and pumping sludge to a sludge pressing machine so as to be subjected to dewatering. The method disclosed by the invention has the beneficial effects that the operating cost is low, the medicated amount of PAC (Polyaluminum Chloride) and PAM (Polyacrylamide) is small, the organic removal rate is high, the sludge sedimentation effect is good, the sludge amount is effectively reduced by 24-32%, and meanwhile, the outlet water can reach the requirements of upgrading standards.

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a treatment method for organic sewage. Background technique [0002] With the improvement of China's industrialization level, the sewage discharge also shows a rising trend. In 2001, China's sewage discharge was 42.84 billion tons, and by 2010 it had reached 61.73 billion tons, an average increase of 1.89 billion tons per year. Compared with 2009, the increase of 2.81 billion tons in 2010 is the largest increase since 2005. [0003] Correspondingly, my country's sewage treatment industry has advanced by leaps and bounds. By the end of 2011, the national urban sewage treatment plants had treated a total of 39.313 billion cubic meters of sewage throughout the year, an increase of 4.572 billion cubic meters or 13.12% year-on-year. By the end of June 2012, a total of 3,243 urban sewage treatment plants had been built in cities and counties across the country, with a treatment capacity o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/48
Inventor 麦建波陈利军张珺蓉张有会
Owner GUANGDONG XINDAYU ENVIRONMENTAL PROTECTION TECH CO LTD