Views: 9 Author: Site Editor Publish Time: 2023-03-03 Origin: Site
In order to eliminate the deformation heat generated during cold rolling of strip steel, iron and steel enterprises need to use emulsion or palm oil for cooling and lubrication. The cold rolling process is to use emulsion for cooling and lubrication during rolling. However, a large amount of emulsion wastewater is produced in the process of steel rolling. Direct discharge will not only waste but also cause serious environmental pollution. Therefore, from the perspective of saving resources and energy and protecting the environment, these wastewater should be recycled or partially discharged after treatment.
However, these concentrated oily wastewater is a kind of high concentration and refractory wastewater that is difficult to treat. Physicochemical treatment methods such as air flotation, adsorption, biochemical and chemical methods are often used at home and abroad. After treatment, the effluent can not reach the standard stably, and there are many disadvantages such as high consumption of chemicals and high operating costs, which are difficult to achieve the ideal treatment effect.
Ultrafiltration ceramic membranehas attracted wide attention at home and abroad and has been applied in many fields due to its outstanding advantages such as strong acid and alkali resistance, high mechanical strength, uniform pore size distribution, good temperature resistance and long service life. Therefore, when we treat cold rolling wastewater, we first consider to use ultrafiltration inorganic ceramic membrane for pretreatment, and then use advanced, mature and reliable microbial technology for treatment. At the same time, cross-flow operation is adopted, which has the advantages of large membrane flux, anti-pollution, long-term operation without blocking, etc. The concentrated oil wastewater can directly enter the ultrafiltration system without complex pretreatment, which can solve the problems that are difficult to be solved by conventional treatment technology.
NanoMem ultrafiltration ceramic membrane can be divided into microfiltration ceramic membrane, ultrafiltration ceramic membrane and nanofiltration ceramic membrane. Ultrafiltration ceramic membrane is characterized by good chemical stability, acid resistance, alkali resistance, organic solvent resistance, high mechanical strength, strong microbial resistance, high temperature resistance, narrow pore size distribution, high separation efficiency, and has been widely used in food industry, biological engineering, environmental engineering, chemical industry, petrochemical industry, metallurgical industry and other fields.