The coal chemical industry is a high-energy and high-pollution industry that brings certain pressure and pollution to both water resources and ecological environment. In order to better protect the environment, solve resources, and develop low-carbon and environmentally friendly production and life, we need to strictly control the wastewater pollution caused by coal chemical industry.
The common types of coal chemical wastewater include coking wastewater, coal gasification wastewater, and coal liquefaction wastewater, among which coking wastewater is the most produced type of wastewater in the coal chemical industry. So what is coking wastewater?
This kind of wastewater is produced in the processes of coal coking, coal gas purification and chemical product recovery refining. It not only contains a large amount of phenol, ammonia nitrogen, cyanide and non-biodegradable oils, but also has a large discharge volume, complex composition and difficult treatment. Once discharged without treatment, it will not only pollute the water body but also threaten people's health.
Therefore, we need to strictly treat coking wastewater. Nowadays, with the continuous development of membrane technology, it has been applied in various treatments, among which nanofiltration membrane technology has shown certain advantages in the treatment of coal chemical coking wastewater.
This nanofiltration membrane technology has sieving effect, Donnan effect and dielectric exclusion effect, making the retention rate of nanofiltration membrane significantly different for organic matter, multivalent ions and monovalent ions. These characteristics of the membrane make it an important component in separating pollutants and water in the treatment of coal chemical coking wastewater.
Therefore, both coking wastewater and other industrial wastewater can use nanofiltration membrane technology for treatment. Nanofiltration membrane technology can not only reduce the wastewater discharge of high-emission coal chemical industry, but also help achieve the recycling of wastewater resources, achieving twice the result with half the effort!
High-salt chemical wastewater usually contains high concentrations of mechanical pollutants and suspended solids, which not only have high treatment costs and difficulty, but also have potential environmental risks. Compared with other traditional water treatment technologies, nanofiltration membrane technology not only has good treatment effects on high-salt chemical wastewater, but also can recover useful substances in wastewater resources, which has unique advantages in the application of high-salt chemical wastewater treatment.
Compared with traditional wastewater treatment technologies, membrane technology has the advantages of high efficiency and energy saving, no phase change, compact equipment, and easy integration with other technologies. In recent years, it has been widely used in wastewater treatment and reuse. Membrane separation technology mainly includes reverse osmosis, nanofiltration, ultrafiltration and microfiltration. As a membrane filtration technology between reverse osmosis and ultrafiltration, nanofiltration membrane technology can effectively intercept organic pollutants and salt in water. At the same time, due to the low retention rate of monovalent salts in water by nanofiltration membrane technology, it can better separate monovalent ions from multivalent ions. Nanofiltration membrane technology has its unique advantages in treating high-salt chemical wastewater and recovering useful substances in wastewater, which deserves further application and promotion.