Coal Chemical Wastewater Treatment

Solution：

Coal chemical wastewater amount is large. It first goes through the MVR or multi-effect evaporation, and produces the high consistency of mother liquor into VESALT scraper vacuum drying in low temperature crystallization system under the condition of vacuum low temperature evaporation drying, can greatly reduce, eliminate waste liquid containing inorganic salt, heavy metal and COD, eventually get dry solid crystal salt, solid crystal salt, moisture content of 15% or less. The water vapor in the wastewater condenses to form a distillate, which is collected into a clean water bucket. The water yield can reach 70% ~ 90%, the water quality is clear and transparent, and the distillate can be reused as middle water or meet the discharge standard.

Application：

Brief Introduction:

Wastewater source：

Coal chemical wastewater is the industrial wastewater produced in the coal chemical production process. Coal chemical production process with coal as raw material through coal tar coking, coal gasification, coal liquefaction, chemical industry, calcium carbide acetylene chemical industry, the chemical production process such as chemical products recycling, turning coal into gas, liquid and solid products and a variety of chemical products. Coking wastewater under refers to the state of high temperature carbonization of coking, form a complicated composition of residual ammonia condensate, gas purification, and the tar in the process of the completed project such as the composition of the complex wastewater.

Coal gasification wastewater is refers to the furnace fuel with air as the gasification medium, chemical reflect changes of the fuel for fuel gas, gas washing wastewater, such as gasification wastewater is produced. Common liquid slag discharge in air flow bed gasification and slag discharge, etc. Liquefaction of waste water in coal direct liquefaction of fuel in the furnace under the condition of high temperature and high pressure, make the fuel is transformed into low molecular organic polymer structure liquid fuels, indirect liquefaction gas gasification to produce syngas, and the catalyst to produce fuel oil.

Wastewater Characteristics：

Coal chemical industry wastewater is characterized by complex components, containing a large amount of solid suspended particles, oxygen, sulfur and other poisonous and harmful substances, COD value and high chroma. The content of pollutants in wastewater is different. Coal chemical industry wastewater COD value in 2000-5000 mg/L, ammonia nitrogen in 200-600 mg/L. Cyanide in 10 to 30 mg/L, cyanide pollutants concentration is high, there are a variety of refractory organics, increased the difficulty of processing.

Wastewater hazard：

Coal chemical industry wastewater pollutants more destructive, such as direct emissions to nature will cause serious environmental pollution, chemical wastewater containing large amounts of organic matter, damage to soil structure and properties. The organic matter in wastewater reacts with other substances in the soil and is easy to form carcinogenic organic matter. If it enters the human body through plants, it will seriously affect human health. Coal chemical wastewater directly into the river will pollute the surrounding water resources, resulting in the death of aquatic organisms. Destroying the ecosystem of the river.

Treatment Difficulties：

1. The content of pollutants in wastewater is high. Coal chemical enterprises have a high content of pollutants in wastewater due to the incomplete reaction of raw materials in production, or the large amount of solvent media used in the processing of raw materials into the wastewater.

2. Strong toxicity, harmful material is more, this is due to the particularity of the raw material, causes the halogen compounds, nitro compounds in the wastewater and dispersant.

3. The biodegradability is poor, the organic matter in the coal chemical wastewater is mainly arsenic, carbazole, biphenyl, triphenyl and so on.

4. The PH value is unstable, due to the high content of pollutants in the wastewater, the discharge of strong acid, strong alkaline are often, there is great harm to organisms, buildings and crops.

In our zero wastewater production and Application center, we have been developing innovative technologies that significantly improve the quality of distilled water for many years. For example, VESALT scraper crystallization technology can be used to meet all quality requirements through an ingenious system preparation, resulting in clear distilled water and dry solid crystals. This makes our cryogenic vacuum distillation systems unique in the global market.

Process Diagram:

Coal chemical wastewater is always the large amount of water, first through the MVR or multi-effect evaporation treatment, and then the high concentrated liquid goes into VESALT scraper low temperature vacuum drying crystallization system, under vacuum low temperature condition to evaporate and dry. It can greatly reduce, remove the  inorganic salts, heavy metals and COD, finally obtain dry solid crystal salt, solid crystal salt moisture content ≤15%. Distillate can be used as water reuse or achieve discharge standards