Chemical wastewater refers to the wastewater generated during the production process of chemical plants, such as the wastewater containing oil from facilities producing ethylene, polyethylene, rubber, polyester, methanol, ethylene glycol, oil storage areas, and air separation and compression stations. After biochemical treatment, it generally meets the secondary discharge standards. However, due to the scarcity of water resources, the water that meets the discharge standards must now undergo further advanced treatment to meet industrial water replenishment requirements and be reused.
Chemical factories, as major consumers of water, typically use several million cubic meters of fresh water annually. With low reuse rates and the discharge of several million cubic meters of wastewater, there is significant water waste and environmental pollution. Additionally, the scarcity of water resources has threatened the production of these industrial water users. To maintain sustainable development for the company, reduce water waste, lower production costs, and enhance economic and social benefits, it is necessary to carry out advanced treatment (triple treatment) of chemical wastewater. This treated water can be used as makeup water for circulating water or as makeup water for desalinated water, thereby achieving the reuse of wastewater.
Due to the impurities in water mainly consisting of suspended particles and fine fibers, mechanical filtration principles are employed with the use of microporous filtration technology to remove impurities. Filter operation is controlled by a PLC or time relay to achieve automatic backflushing and automatic operation. The pump boosts the required water head for the filter, with the filtered water directly introduced into the production system.
Analysis of Key Characteristics of Chemical Wastewater
1. The composition of chemical wastewater is complex, with reaction raw materials often being solvent substances or cyclic compounds, which increases the difficulty of treating the wastewater.
2. The wastewater contains a significant amount of pollutants, primarily due to incomplete raw material reactions and the extensive use of solvents during the raw material or production process.
3. The presence of numerous toxic and harmful substances is prevalent, particularly in refined chemical wastewater, which contains many organic pollutants that are detrimental to microorganisms, such as halogen compounds, nitro compounds, dispersants, or surfactants with the function of removing harmful substances.
4. There is a higher abundance of biodegradable materials in B compared to C, indicating poorer biodegradability.
Wastewater Characteristics:
Wastewater generated during the production of chemical products exhibits high volume, toxicity, organic matter concentration, salt content, color intensity, and high levels of difficultly degradable compounds, making it challenging to treat. However, the wastewater also contains numerous recoverable resources. Membrane technology, as a high-tech approach, plays a crucial role in the production and processing, energy conservation, cost reduction, and clean production within the chemical industry.
