Chemical wastewater treatment – PAC, PAM

Chemical wastewater refers to the wastewater generated during the production process of chemical plants, such as the production of ethylene, polyethylene, rubber, polyester, methanol, ethylene glycol, oil tank areas, air separation and air compressor stations and other oily wastewater devices. wastewater produced. Biochemical treatment can generally meet the national secondary discharge standards. Now due to the shortage of water resources, water that meets the discharge standards must be further treated. Recycling meets industrial water replenishment requirements.

Analysis of main features

1. The composition of chemical wastewater is complex, and the reaction raw materials are often solvent substances or compounds with cyclic structures, which increases the difficulty of wastewater treatment;

2. Wastewater contains a large number of pollutants, mainly due to incomplete reaction of raw materials and the use of large amounts of solvents in raw materials or production.

3. There are many toxic and harmful substances, and many organic pollutants in fine chemical wastewater are toxic and harmful to microorganisms;

4. There are many biodegradable substances, low BOD/COD, and poor biodegradability;

Chemical wastewater treatment methods

COD can be used as an indicator of the relative content of organic matter. The lower the COD value, the cleaner the wastewater. To reduce the COD value in chemical wastewater treatment projects, there are four commonly used chemical wastewater treatment methods: physical, chemical, physicochemical and biological.

1. Physical method: It uses the physical effects of wastewater to achieve the purposes of separation, degradation, and purification. Mainly for suspended solids or milky turbidity in wastewater, grilling, screening, centrifugation, clarification, filtration, etc. are generally used, which can greatly enhance the effect, reduce costs, and reduce pollution.

2. Chemical method: Chemical wastewater contains a large number of chemical substances. The chemical method uses the principle of chemical reaction to eliminate or reduce the content of pollutants. Common methods include: neutralization, precipitation, redox, catalysis, extraction, electrolysis, incineration, flocculation, etc. During the chemical reaction of sewage, no secondary pollutants are produced.

3. Physical and chemical methods: Physical and chemical methods, such as evaporation concentration, ion exchange, coagulation, adsorption, photo-oxidation, centrifugation, purification, etc., can be used to remove dissolved substances and colloidal substances in sewage, thereby achieving the goal of reducing COD content. Purpose.

4. Biological treatment method: It uses the metabolism of microorganisms to digest and degrade the nutrients of organic or inorganic substances in the wastewater into stable and harmless substances.

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