How to treat oily washing wastewater efficiently?

The main components of oily washing wastewater from oil plant include saponin horn, oil, phospholipid, protein, colloid, pigment, etc. It usually comes from the production process of oil refining, fatty acid, margarine, mayonnaise and so on. It causes serious environmental pollution and can only be discharged after reaching the standard. The traditional process adopts "oil separation, flotation and biochemical treatment" to treat almost emulsified refining wastewater, which is difficult, complex operation and high cost. The application of membrane separation technology for fine pretreatment of wastewater will greatly reduce COD and oil content, not only reduce the burden of subsequent biochemical treatment, but also recover a large amount of waste oil and saponin, save operation cost and ensure that the discharge meets the standard.

The research shows that the ceramic membrane separation technology can effectively separate oil from wastewater, the oil interception rate can reach more than 99%, and the COD removal rate can reach more than 80%.

The main characteristics of ceramic membrane separation technology for treating oily washing wastewater are as follows:

The ceramic membrane can effectively recover the oil in the washing wastewater with a recovery rate of more than 98%. The recovered oil has good quality and can be returned to the production process for reuse, which improves the total output rate of finished oil.

After the oily washing wastewater is filtered by ceramic membrane, most of the oil and soap contents are separated and removed, and the total COD value can be reduced by more than 80%, which greatly reduces the load of subsequent biochemical treatment.

After the oily washing wastewater is filtered by ceramic membrane, the subsequent treatment process can be greatly simplified, the amount of civil engineering and floor area can be reduced, and the one-time total investment in the treatment of washing wastewater can still be lower than that of traditional process.

The ceramic membrane filtration system is driven by low pressure, with less power consumption, no chemical additives for subsequent treatment, and less sludge production, which greatly reduces the operation cost.

Ceramic membrane has good chemical stability, high mechanical strength and long service life; The system has the advantages of simple operation, stable operation and low maintenance cost; The process can be controlled automatically.