Chemical wastewater refers to the wastewater produced during the production process of chemical plants, such as oily wastewater from the production of ethylene, polyethylene, rubber, polyester, methanol, ethylene glycol, oil tank areas, air separation and air compressor stations, etc. After biochemical treatment, it can generally meet the national secondary discharge standard. However, due to the shortage of water resources, the water that meets the discharge standard needs to undergo further advanced treatment to meet the requirements of industrial water replenishment and reuse.
Chemical plants, as major water consumers, typically consume millions of cubic meters of fresh water annually. However, their water reuse rate is low, and they also discharge millions of cubic meters of wastewater, wasting significant water resources, causing environmental pollution, and threatening the production of these large industrial water users due to water scarcity. To maintain sustainable development, reduce water waste, lower production costs, and improve economic and social benefits, advanced treatment (tertiary treatment) of chemical wastewater is necessary. This wastewater can then be used as makeup water for circulating water systems or desalination processes, achieving wastewater reuse.
Since the impurities in the water are mainly suspended particles and fine fibers, the filter is removed using mechanical filtration principles and microporous filtration technology. The operation of the filter equipment is controlled by a PLC or time relay, enabling automatic backwashing and operation. A booster pump provides the necessary headwater for the filter, and the effluent is directly introduced into the production system.
Analysis of the main characteristics of chemical wastewater:
1. Chemical wastewater has a complex composition, and the reaction raw materials are often solvents or cyclic compounds, which increases the difficulty of wastewater treatment.
2. The wastewater contains a large amount of pollutants, mainly due to incomplete reaction of raw materials and the use of large amounts of solvents in raw materials or production.
3. It contains many toxic and harmful substances. Fine chemical wastewater contains many organic pollutants that are toxic and harmful to microorganisms, such as halogen compounds, nitro compounds, dispersants or surfactants with bactericidal effects, etc.
4. It contains more substances that are difficult to degrade, and its B content is lower than that of C , resulting in poor biodegradability;
