Grease sewage treatment knowledge introduction

How to treat oily sewage

The grease sewage mainly comes from the leaching, physical and chemical refining process of the grease production workshop in the continuous alkali training, hydration, acidification, neutralization, degumming, deodorization, decolorization, washing, filtering and other processes. In addition to the high concentration of grease, the sewage also contains phospholipid, soap and other organic matter, acid, alkali, salt and solid suspended matter, COD and BOD are very high. At the same time, the grease sewage is mostly intermittent discharge, the composition is complex, the pH value is unstable, and the water quality and quantity vary greatly, which has a great impact on the sewage treatment facilities.

Alarge amount ofoilcan be recovered after acidification and oil isolation treatment, which can not only reduce the organic load of subsequent treatment process, but also recover valuable oil. The sewage goes through the oil trap to remove the floating oil on the surface and then enters the neutralization adjustment pool. The sewage in the adjustment pool is then pumped into the air floating pool with a pump to remove the floating oil, phospholipid, soap foot and COD in the sewage. Water enters the YanYangChi, using acidification hydrolysis of anaerobic bacteria, will be broken into organic macromolecular organic matter in wastewater such as small molecule organic compound, ensure follow-up aerobic biochemical degradation, YanYangChi water into the SBR biological contact oxidation pool, all kinds of organic pollutants in water by aerobic biological oxidation decomposition is converted to CO2, HO2 harmless substance, such as So as to achieve the purpose of removing pollutants. The effluent goes into the middle pool, enters the reaction pool after adding coagulant, and is fully mixed. Then, through the sedimentation pool, the mud and water are separated naturally and enter the biological carbon filter. Part of the residual organic matter is adsorbed and intercepted by activated carbon, and is biodegraded at the same time. At this time, the effluent completely meets the requirements of reuse, and can be re-used as circulating cooling water and miscellaneous water, or directly discharge up to standard.

The sludge from the air floating tank and sedimentation tank is regularly discharged into the sludge drying tank. After drying, the sludge cake is transported to the landfill, and the filtrate is returned to the regulating tank for re-treatment.