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6 Treatment Methods for Excessive COD of Sewage

by:BOQU     2022-09-24

At present, typical wastewater COD exceeding the standard mainly includes electroplating, circuit board, papermaking, pharmaceutical, textile, printing and dyeing, chemical and other wastewater. So what are the treatment methods for COD wastewater?

Wastewater COD classification:

The sources of production wastewater are divided into industrial wastewater. Agricultural wastewater. Medical wastewater. Medical wastewater.

Domestic sewage refers to a complex mixture of various forms of organic substances composed of inorganic and organic substances, including:

1. Floating or suspended solid particles of various sizes

2. Gel-like and gel-like diffusers

3. Pure solution.

COD wastewater treatment methods include:

Removal of COD by coagulation: Chemical coagulation can effectively remove organic matter in wastewater and reduce COD to a large extent. The coagulation process is adopted, by adding flocculant and using the adsorption bridge of the flocculant to compress the electric double layer, so that the colloid and suspended matter in the water are destabilized, collided, and aggregated into flocs, and then the sedimentation or air flotation process is used to remove the particles are separated from the water, so as to achieve the purpose of purifying the water body.

Biological removal of COD: Biological method is a wastewater treatment method that relies on microbial enzymes to oxidize or reduce organic matter to destroy unsaturated bonds and chromophores to achieve the purpose of treatment. In recent years, microorganisms have fast reproduction speed, strong adaptability, and low cost, and are widely used in the treatment of scouring wastewater.

Electrochemical COD removal: The essence of electrochemical treatment of wastewater is to directly or indirectly use electrolysis to remove pollutants in water, or to convert toxic substances into non-toxic and low-toxic substances.

Micro-electrolysis to remove COD: Micro-electrolysis technology is currently an ideal method for treating high-concentration organic wastewater, also known as internal electrolysis. The invention uses micro-electrolysis materials to fill the wastewater under the condition of no electricity and generates a potential difference of 1.2V by itself to electrolyze the wastewater to achieve the purpose of degrading organic pollutants.

COD removal by absorption method: activated carbon, macroporous resin, bentonite, and other active adsorption materials can be used to adsorb and treat particulate organic matter and chromaticity in sewage. It can be pre-treated to reduce COD which is easier to handle.

Removal of COD by oxidation method: In recent years, the application of photocatalytic oxidation technology in the field of wastewater treatment has good market prospects and economic benefits, but there are still many problems in the research in this field, such as finding efficient catalysts. Separation and recovery of catalysts wait.

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