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Sequential flow return type sewage treatment method and its treatment device

A sewage treatment method and sewage treatment device technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of affecting microbial metabolic intensity, weakening of microbial degradation function, and degradation Weakening and other problems, to achieve the effect of efficient operation of water, efficient degradation of organic matter, and improved biodegradability

Active Publication Date: 2017-04-19
DONGTAI CITY DONGFANG MARINE FITTING
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Problems solved by technology

Because this kind of processing technology and its actual products are limited to the superimposed application of multiple processing technologies, it is impossible to analyze and study the mutual influence between each processing technology and the dependence and flow sequence of each processing technology and their mutual influence, so there is Some inherent shortcomings: First, in the reaction system where electrocoagulation and biological treatment coexist, the external electric field of electrocoagulation will inhibit or weaken the growth and proliferation of microorganisms, affect the metabolic intensity of microorganisms, and cause microorganisms to appear "poisoning" phenomenon; The accumulation of inhibition also weakens the sludge activity and is prone to aging, making it difficult to maintain the operating conditions for a long time
Second, the enhancement of current density can improve the flocculation and precipitation of pollutants in sewage, but the enhancement of current density will also enhance the flocculation and precipitation of microorganisms in sewage, which will reduce the number of microorganisms in sewage, weaken the degradation effect, and sludge run It shows deterioration symptoms, and the sludge transitions from good to worse; when the growth rate of microorganisms is lower than the speed of flocculation and sedimentation, the biological treatment efficiency will be lost, and it will become a pure electro-flocculation system.
Therefore, it is difficult to control the electric field in the electrocoagulation superimposed biological treatment system, and it is difficult to maintain high sludge concentration, which leads to poor stability of the treatment system and hinders the practical application of the electrocoagulation biological reaction system.
Third, in electrocoagulation, metal anodes generate electrons to form metal nitrogen oxides of "micro flocculants". State impurities and suspended impurities are coagulated and precipitated to realize the purification and removal of pollutants in the water body. However, the excessive "flocculant" produced by electrocoagulation not only enhances the coagulation and precipitation of pollutants, but also coagulates and precipitates a large number of microorganisms, making the number of microorganisms and The population decreases, and the reduction in the number and population of microorganisms weakens the microbial degradation function

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  • Sequential flow return type sewage treatment method and its treatment device

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Embodiment Construction

[0020] In the sewage treatment process of the present invention, taking the treatment of domestic sewage including black water and gray water as an example, on the treatment process path of the domestic sewage, an anaerobic cabinet 2, a contact oxidation cabinet 4, and an electrocoagulation sedimentation cabinet are sequentially arranged 13 and film cabinet 20. First, the sewage is transported to the anaerobic tank 2 for anaerobic biological treatment. After the anaerobic biological treatment, the sewage in the anaerobic tank 2 enters the contact oxidation tank 4 for aeration and oxygenation. The aeration and oxygenation time is T1 =50-70 minutes, then stop the aeration time T2=8-12 minutes, so that the sewage in the contact oxidation cabinet is precipitated and separated, and the supernatant in the contact oxidation cabinet after precipitation is transported to the electrocoagulation sedimentation cabinet 13, and the electrocoagulation The electrode materials of the positive ...

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Abstract

The invention discloses a sequence flow return type sewage treatment method which comprises the following steps: conveying sewage to an anoxic / anaerobic tank; conveying the sewage into a contact oxidation tank and performing aeration oxygenation on the sewage in the contact oxidation tank; conveying the supernatant obtained by precipitating in the contact oxidation tank into an electric flocculation and sedimentation tank; returning and mixing the sewage part subjected to electric flocculation, conveying the other part of sewage subjected to electric flocculation into a membrane tank for performing mud-water separation, and discharging the treated water. According to the treatment device disclosed by the invention, an anoxic / anaerobic tank, a contact oxidation tank, an electric flocculation and sedimentation tank and a membrane tank are separated on a treatment unit tank, wherein the contact oxidation tank is communicated with the electric flocculation and sedimentation tank by virtue of a supernatant conveying pipe; a flocculation solution return pipe is arranged on the electric flocculation and sedimentation tank; and the electric flocculation and sedimentation tank is communicated with the membrane tank. The mutual interference and restriction between electric flocculation and biological treatment can be avoided, and the efficiency can be maximized. The method and device disclosed by the invention are widely applied to treatment of domestic sewage on ships and lands and industrial wastewater.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a treatment method for water and land point source domestic sewage such as rivers, marine vessels, marine equipment, cities and towns. The invention also relates to a sewage treatment device applying the treatment method. Background technique [0002] Domestic sewage is the sewage produced in the process of human production, and it is the main source of pollution of water bodies. It mainly includes feces and washing sewage. With the rapid development of social economy and the increase of population, the discharge of domestic sewage is increasing, which has become a serious obstacle to economic development and the improvement of people's quality of life. People are facing the severe test of double water shortage of resources and water quality. The discharge of domestic sewage from land residents such as cities, villages and towns directly affects people's living environm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 梅东兴施悦王小春吴义生徐森王铖张祖军
Owner DONGTAI CITY DONGFANG MARINE FITTING
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