Nghiên cứu xử lý nước thải thủy sản bằng công nghệ A2/O - MBR

Abstract

In order to study the applicability of combined wastewater treatment processes of A2/O-MBR, a lab scale model of A2/O-MBR processes with 55-liter A2/O tank combined with 26-liter MBR tank was used to remove contaminants from an aquatic products processing wastewater at relatively high concentration of nitrogen and phosphorus. The COD, BOD5, N-NO3-, N-NH4+, TKN, TN and TP of the influent wastewater are 749± 41,73 mg/L, 507± 49.08 mg/L, 4.35± 1,43 mg/L, 18.77± 0.92 mg/L, 72.9 ± 11.38 mg/L, 77.25 ± 10.01 mg/L, and 37.67± 9.07 mg/L and at pH 6.9 respectively. The A2/O-MBR model was run at hydraulic retention time of 8 hours, organic matter loading of 1.52 kg BOD/m3.day, COD loading rate for anaerobic chamber of 22.47 kg COD/m3.day and MLSS concentration for A2/O tank of 4.163 mg/L. The COD, BOD5, N-NO3-, N-NH4+, TKN, TN, and TP in the effluent were 21.49 ± 0.86 mg/L, 16.8 ± 1.56 mg/L, 2.4 ± 0.28 mg/L, 0.75 ± 0.13 mg/L, 1.32 ± 0.39 mg/L, 3.72 ± 0.41 mg/L, and 5.87 ± 1.0 mg/L, respectively. The effluent quality met the column A of the national technical regulation on the effluent of aquatic products processing industry, with corresponding removal efficiency of 97% COD; 96% BOD5; 45% N-NO3-, 96% N-NH4+; 98% TKN, 95% TN, and 84% TP. Therefore, the A2/O-MBR combined processes can be applied to treat aquatic products processing wastewaste and all other wastewaters of the same characteristics.