Study on Treatment of Domestic Wastewater by Submerged Flat MBR

Abstract

The treatment of dormitory and refectory mixed wastewater by a submerged flat membrane bioreactor (MBR) was studied. The A/O MBR system treated wastewater 4m 3 /d. The mean removal efficiency of BOD 5 and COD Cr was more than 95% with the influent concentration of 100~500mg/L BOD 5 and 120~900 mg/L COD Cr . It was proved that active carbon treatment reduced effluent chroma effectively. At the steady working period (MLSS 8,000~15,000mg/L), TN and NH 3 -N removal efficiencies were more than 85%, and that of TP was between 50% and 95%. Besides, this paper studied the membrane fouling mechanism and revealed that membrane fouling was affected by MLSS, particle size distribution of sludge and composition of raw water. We found that the diameter of sludge particles changes with the MLSS. We also found the small particles caused membrane fouling. The results proved that submerged flat MBR was suitable to treat small-or-medium-size domestic and industrial wastewater and would have a promising future.

Significant role of membrane fouling and microbial community on the performance of membrane bioreactor (MBR) system

“…But due to some disadvantages accompanied by this process such as difficulty in solid-liquid separation, large surface area requirement and high production of excess sludge, membrane bioreactors (MBRs) have gained much attention in the field of wastewater treatment [1,2]. Advantages of MBR process include higher effluent quality, lesser sludge production, higher sludge age, more compact structure and better performance for nitrification and denitrification [3,4].…”

Study on Dynamics of Electrochemical Degradation for Chitosan

“…Electrochemical treatment, which is high efficient, operational, flexible, easy to be roboticized and friendly to environmentally, attracted wide attention from scholars [2] . And electrochemical treatment method was efficient for degradation of organic substance [3][4][5][6][7][8][9][10][11] and macromolecule [12] . Recently, the degradation of chitosan by electrochemical method has been reported [13,14] , which illustrate that the process is feasible, convenient and potentially applicable.…”