What kind of wastewater is generated in coal chemical processes?

Coal chemical processes primarily generate the following types of wastewater: 1. Coal gasification wastewater: Coal gasification is the process of converting coal into syngas, and the wastewater arises mainly from stages such as slurry treatment, gas washing, and gas purification during this process. 2. Coal coking wastewater: Coal coking is the process of heating coal to produce coke and gas; the wastewater arises mainly from stages such as coke oven cooling, ammonia washing, and desulfurization processes. 3. Coal liquefaction wastewater: Coal liquefaction is the process of converting coal into liquid fuel, and the wastewater arises mainly from stages such as coal pretreatment, solvent recovery, and product separation. 4. Coal chemical industry wastewater: Other types of wastewater are also generated in coal chemical production, such as vehicle washing wastewater, domestic sewage, and rainwater. These wastewater streams contain various pollutants such as organic substances, inorganic salts, and heavy metals, which can have an impact on the environment. Therefore, wastewater treatment is necessary in the coal chemical industry to reduce environmental pollution. .