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How to solve the restaurant sewage in Yiwu old railway station area
1, coarse granulation method: coarse granulation method is also called coalescence filtration method. Using oleophilic and hydrophobic materials, when oily wastewater passes through, tiny oil droplets will adhere to its surface to form an oil film. When it reaches a certain thickness, it will leave the surface of the filter material under the action of buoyancy and shear force of water flow, forming large oil beads floating to the water surface for oil-water separation. The coarse granulation technology can effectively reduce the oil content and COD concentration in catering wastewater, which is beneficial to the subsequent biochemical treatment.

2. Adsorption method: Adsorption method is a method that uses porous materials to make one or more substances in wastewater adsorb on the solid surface and be removed. According to the different adsorption forces on the solid surface, it can be divided into physical adsorption and chemical adsorption.

3. Air floatation: Air floatation is to generate a large number of microbubbles through a certain method, and make them adhere to solid or liquid pollutant particles with density close to that of water in wastewater to form air floating bodies with density less than that of water, and float to the water surface to form scum for separation. It is mainly used to remove suspended matter and grease with specific gravity less than 1. Combined with the use of flocculant, the removal effect can be further improved. Good air flotation effect and small floor space.