Method for deeply removing COD (Chemical Oxygen Demand) in wastewater

A waste water and depth technology, applied in chemical instruments and methods, water/sewage treatment, natural water treatment, etc., can solve the problems of increased power consumption of water production, increased cost of chemicals, high cost of use, etc., to reduce operating costs and reduce chroma , the effect of stable operation

Pending Publication Date: 2021-12-28
上海心缘环境工程有限公司
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Problems solved by technology

[0005] In view of the above-mentioned related technologies, the inventor believes that the polluted membrane modules lead to a series of problems such as increased water production power consumption, decreased water production rate, frequent membrane module cleaning, membrane module replacement costs, and significantly increased chemical costs, resulting in double-membrane The method of treating sewage with high cost and low water production rate

Method used

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  • Method for deeply removing COD (Chemical Oxygen Demand) in wastewater

Examples

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Embodiment 1

[0044] Example 1, a centralized sewage treatment plant in a pharmaceutical park mainly collects and treats biopharmaceutical wastewater. The upstream biopharmaceutical types include chlortetracycline, chlortetracycline hydrochloride, oxytetracycline, coenzyme Q10, penicillin, pesticides, veterinary drugs, enzyme preparations, etc. . Design water volume 12000m 3 / d.

[0045] In this embodiment, a method for deep removal of COD in wastewater includes a biochemical treatment system 1 and a chemical dosing coupled sedimentation system 2 . The sludge concentration of the biochemical treatment system 1 is controlled at 10-13g / L. The biochemical treatment system 1 includes a hydrolysis tank 11, an aerobic tank 12 and a secondary sedimentation tank 13, and the hydrolysis tank 11 and the aerobic tank 12 are circulating water tanks. The sludge age in the aerobic tank 12 was maintained at 60 days, the sludge age in the aerobic tank 12 was maintained at 120 days, and the sludge load in ...

Embodiment 2

[0050] A pharmaceutical factory produces waste water. The products include amoxicillin, cephalosporin antibiotics, tylosin, acetylspiramycin, abamectin, 7ACA and veterinary antibiotics (tilmicosin, tilmicosin phosphate, etc.). Design water volume 20000m 3 / d.

[0051] The sewage treatment device of this embodiment includes an A / O treatment system and an oxidation coupled advanced treatment system. The sludge concentration of the biochemical treatment system 1 is controlled at 8-10 g / L. The biochemical treatment system 1 includes a hydrolysis tank 11, an aerobic tank 12 and a secondary sedimentation tank 13. The hydrolysis tank 11 and the aerobic tank 12 are circulating water tanks. The sludge age in the aerobic tank 12 was maintained at 120 days, and the sludge load in the aerobic tank 12 was 0.05gCOD / (gMLSS·d). Sewage is added to the hydrolysis tank 11, the mixed solution after hydrolysis in the hydrolysis tank 11 enters the aerobic tank 12, and the mixed solution at one en...

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Abstract

The invention discloses a method for deeply removing COD in wastewater. The method comprises the following steps that: sewage is added into a hydrolysis tank, a mixed solution hydrolyzed by the hydrolysis tank enters an aerobic tank, the mixed solution at one end, far away from the hydrolysis tank, of the aerobic tank flows back into the hydrolysis tank, the mixed solution in the aerobic tank flows into a secondary sedimentation tank, sludge settled in the secondary sedimentation tank flows back into the hydrolysis tank; and water in the secondary sedimentation tank enters a coagulation tank, ferrous sulfate and hydrogen peroxide are added into the coagulation tank, water in the coagulation tank flows into a defoaming tank, air is introduced into the defoaming tank, water in the defoaming tank flows into a flocculation tank, a flocculant is added into the flocculation tank, mud-water separation is performed in a tertiary sedimentation tank, and clean effluent is obtained. Compared with a conventional Fenton method, the method has the following advantages that: the use amount of chemicals (especially hydrogen peroxide, acid and alkali) in the oxidation coupling-precipitation technology is reduced by 50%-75%; and the operation cost is greatly reduced.

Description

technical field [0001] The present application relates to the field of wastewater purification, in particular to a method for deeply removing COD in wastewater. Background technique [0002] Looking at the current industrial water treatment technology field, the existing and mature industrial water treatment technologies on the market are still at the level of up to standard treatment and tube discharge. Especially when dealing with refractory industrial wastewater, most of the energy for environmental protection is still concentrated on advanced wastewater oxidation technologies such as supercritical water oxidation technology, ozone catalytic oxidation, and electron beam oxidation, while ignoring the ability to treat traditional microorganisms It is more difficult to talk about the deep degradation of pollutants or the degradation limit of pollutants. [0003] The sources of membrane fouling mainly include the following two aspects: on the one hand, the membrane fouling p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/34
CPCC02F9/00C02F3/12C02F1/725C02F1/52C02F1/5236C02F2001/007C02F2103/343
Inventor 仇鑫耀李春峰罗剑顾润宇
Owner 上海心缘环境工程有限公司
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