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How to Treat Chemical Wastewater?

Aug. 20, 2021


Chemical waste water refers to the waste water produced in the production process of chemical plants, such as oily waste water from the production of ethylene, polyethylene, rubber, polyester, methanol, ethylene glycol and other equipment. After treatment, it can reach the national secondary discharge standard. Due to the shortage of water resources, the water that meets the discharge standards needs to be further processed to meet the requirements of industrial water replenishment and reuse. 

The chemical industry wastewater contains a lot of impurities and toxic substances, and the treatment technology requirements are very strict. Today let's take a look at what advanced treatment methods we have for chemical wastewater:

1. Electrocatalytic Wastewater Decomposition Method

Electrocatalytic wastewater decomposition can effectively treat the toxic substances in the water. At room temperature, catalytically active electrode reactions will form hydroxyl radicals, and the organic matter in the water will gradually be transformed into biodegradable organic matter. In addition, some organic matter will burn and be converted into carbon dioxide and water, which is a usable resource. The electrocatalytic wastewater decomposition method is simple and convenient to operate, and the wastewater treatment efficiency is high, so it's widely used.


2. Membrane Technology Wastewater Separation Method

The treatment process of chemical wastewater is relatively complicated, and the expected effect can only be achieved by scientific treatment during the treatment process. Compared with traditional water treatment methods, membrane technology has the advantages of good treatment effect, recycling of wastewater and recovery of useful components, etc. It is an effective technology for wastewater recycling. Various membrane separation technologies such as microfiltration(MF), ultrafiltration(UF), reverse osmosis(RO) and electrodeionizaiton (EDI) are combined in industrial water treatment. It can separate harmful substances in water without borrowing other substances. And it can effectively recycle the reused raw materials. Hongtek provides a series of microfiltration products, such as Melt Blown Cartridges, string wound cartridges and Pleated Filter Cartridges that are widely used in pre-filtraiton of chemical wastewater treatment.


3. Ozone Wastewater Decomposition Method

This method mainly relies on strong oxidants. The contact reaction between ozone and organic matter in chemical wastewater can effectively clean up impurities such as phenol and cyanide in the wastewater, eliminate peculiar smells in the water, and have a certain sterilization effect. The oxidation function of ozone can remove pollutants in the water, and ozone can be converted into oxygen after being decomposed in the water. However, when using the ozone wastewater decomposition method, its operation method must be carried out in accordance with the requirements. If an error occurs in a certain link, it will cause greater losses.

4. Iron-carbon Micro-electrolysis Wastewater Treatment Technology

The iron-carbon micro-electrolysis wastewater treatment technology has an outstanding treatment effect, which can effectively decompose and filter the iron fillings in the wastewater. It uses electrochemical oxidation and reduction of substances, electric enrichment of flocs, as well as the aggregation of substances produced by electrochemical reactions, and the absorption and filtration of newly formed flocs. Due to the good wastewater treatment effect, low cost, easy operation and maintenance, this method is widely used in chemical wastewater treatment.

5. Treatment of Chemical Wastewater by Evaporation Method

Evaporation method, the method of evaporating and concentrating wastewater and evaporating and crystallization using evaporation process, mainly to separate chemical wastewater from brine.

At present, the shortage of water resources has threatened the production of these major industrial water users. In order to reduce the waste of resources, reduce production and operation costs, and improve the economic efficiency of enterprises for sustainable development, enterprises need to carry out advanced treatment of chemical wastewater, which is used as the recycle of circulating water to achieve sustainable development and resource recycling.

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