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[Chemical Knowledge]：How to deal with cod exceeding the standard

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How to deal with
COD exceeding the standard
COD(Chemical Oxygen Demand) refers to the amount of oxygen consumed by organic matter in the chemical oxygen demand experiment, and is one of the indicators reflecting the organic matter content in water. Excessive COD may lead to the deterioration of water environment, affect the balance of ecosystem and human health, so it needs to be dealt with in time. This paper will introduce the treatment method of COD exceeding the standard to ensure the health of the water environment. The reasons for the excessive COD of the

1.

There are many possible reasons for the excessive COD, mainly including the following:

1. Various organic waste water and waste gas emissions in the production or processing process.

2. The biological degradation is weakened or unable to play, resulting in the failure of organic matter to be treated and decomposed in time.

3. Excessive input of water pollution sources, such as urban drainage pipes and industrial wastewater discharge.

2. COD exceed the impact of

COD exceed the impact on the water environment and ecosystem is mainly manifested in the following aspects:

1. COD exceed the standard will cause the increase of water oxygen consumption, resulting in insufficient oxygen supply in the water, affecting the growth and reproduction of aquatic organisms.

2. Excessive COD changes the color, odor and other characteristics of the water body, affecting the availability and ornamental value of the water.

3. Excessive COD will lead to the accumulation of heavy metals, organic pollutants and other substances in water, affecting human health. The treatment method of

3. COD exceeding the standard

COD exceeding the standard can take the following measures to achieve the treatment purpose:

1. biochemical treatment. Biochemical treatment is mainly through the suspension of microorganisms, the organic matter in the water is decomposed into water and carbon dioxide. The sewage with excessive COD is introduced into the biochemical treatment equipment, and the organic matter is removed in the biological degradation process, so that the COD is reduced to the standard range.

2. Chemical treatment. Chemical treatment is a method of using chemicals to treat harmful substances in water. Common chemical treatment methods include oxidation reduction, coagulation sedimentation, adsorption and other methods. This method is generally applicable to the case of high COD concentration.

3. Physical treatment. Physical treatment is mainly the use of filters, centrifuges and other devices for filtration, separation and other operations to remove COD exceeded the organic matter.

4. Raise environmental awareness. Raising environmental awareness and reducing COD pollution from the source is also an important way to control COD exceeding the standard. Enterprises should formulate perfect environmental protection measures to reduce the discharge of wastewater and the content of pollutants, and realize the coordinated development of production and environment. The prevention and control
of

4. COD exceeding the standard
to prevent COD exceeding the standard can start from the following aspects:

1. Strictly control sewage discharge. Enterprises should formulate scientific and reasonable wastewater discharge standards according to the actual situation of the industry and the enterprise itself, and formulate corresponding wastewater treatment plans to ensure that the discharged wastewater meets environmental protection standards.

2. Strengthen process control. Enterprises should strengthen the debugging and management of the process, minimize the possibility of COD generation, classify, recycle and reuse in the production process, and reduce COD emissions.