Ceramic membrane---Organic membrane coupled MBR

Many seafood processing enterprises have an annual processing capacity of hundreds of millions of tons, and the wastewater discharge is increasing year by year. Marine product processing wastewater has the characteristics of complex impurities, high concentration of organic matter, grease and phosphorus, strong acidity, poor biodegradability, etc. Direct discharge will seriously pollute the water quality of coastal waters, which is very unfavorable to the development of aquaculture and the maintenance of ecological environment near the coast.

At present, coagulation/flotation contact oxidation or the combination process of adding hydrolysis acidification at the aerobic front end to improve the biodegradability or adding CASS section at the aerobic end are mostly adopted. Although these traditional processes have low treatment costs, the effluent quality is difficult to be stable for a long time, and cannot meet the high discharge requirements, which will also affect the quality of coastal water along the line.

Ceramic membrane is one of the most developed MBR inorganic membranes, which is characterized by good chemical stability, strong anti pollution ability, high mechanical strength, and resistance to various corrosion. The new ceramic membrane and organic membrane coupling membrane group effectively combines the characteristics of organic membrane and inorganic membrane, which can effectively solve the problem of flat ceramic membrane fouling and blocking, ensure membrane flux, and reduce the cost of the entire membrane module.

According to the characteristics of seafood processing wastewater, the combined process of super efficient shallow ion flotation machine anaerobic composite bed anoxic MBBR is mainly adopted, and the ceramic membrane flexible organic membrane coupling membrane group MBR is the core of advanced treatment. Among them, MBBR filler is made of MgO surface modified diatomite hollow ceramics, which improves the efficiency of film hanging (especially nitrifying bacteria), the treatment effect of the whole biochemical system and the stability of the system. In MBR process, flexible organic ceramic coupling membrane group is used, which has good filtration effect and high membrane flux. Only the bottom aeration purging can greatly improve the anti fouling ability of flat ceramic membrane, significantly reduce the frequency of chemical cleaning, and ensure the continuity of the engineering treatment system.

After 10 months of commissioning and operation, the treatment effect of the project is efficient and stable, and all effluent indicators are better than the designed effluent quality. Therefore,  flexible organic ceramic coupling membrane group can provide a new way for the further promotion of flat ceramic membrane.