The process of treating refinery sewage with columnar activated carbon is different from that of treating sewage from petrochemical plants.activated carbon granules In refinery sewage, the substances adsorbed by coal-based columnar activated carbon are mainly hydrocarbons, and the adsorbed substances contained in sewage from petrochemical plants There are many types and more complicated.
In refinery sewage and petrochemical plant sewage, process sewage or oily drainage is the usual treatment object. Because this type of sewage contains floating oil and suspended matter, it is not suitable to treat it directly with activated carbon.
Therefore, in the treatment of sewage from oil refineries and petrochemical plants, it is necessary to pretreat by coagulation sedimentation, coagulation pressurization and flotation, sand filtration and their combination methods to remove oil and floating substances first, and then treat them with activated carbon. More effective. In petrochemical plant sewage, there is often no floating substances, and it is more effective to use activated carbon on this basis. In petrochemical plant sewage, there is often no floating substances, but sometimes the BOD value is high or the BOD/COD ratio is high, so it is not necessary to use coagulation and filtration methods for pretreatment, but it is necessary to combine the coal columnar activated carbon adsorption method with activated sludge And other biochemical treatment methods.
The coal columnar activated carbon adsorption process can be used alone or in combination with physical and chemical processes or biochemical processes. When biophysical method is used instead of biochemical method and combined with activated carbon adsorption method to treat refinery wastewater, COD is reduced by 64%, BOD is reduced by 24%, and solid content is reduced by 44%.
As the activated carbon removes the detergent in the sewage, the foaming degree in the aura pool and the corresponding power consumption are also reduced, and there is no need for large investment and increased floor space. powdered activated carbon wholesale At the same time, it is easy to control and adjust the dosage of activated carbon. As microorganisms can regenerate activated carbon, its adsorption activity decreases much slower than when activated carbon is filled.
