Effect of Staged Dissolved Oxygen Optimization on In-situ sludge Reduction and Enhanced Nutrient Removal in an A2MMBR-M System

2017 5th International Conference on Environment Pollution and Prevention

生态环境科学

Yang, Shan-Shan^1 ; Pang, Ji-Wei^1 ; Jin, Xiao-Man^1 ; Wu, Zhong-Yang^1 ; Yang, Xiao-Yin^1 ; Guo, Wan-Qian^1 ; Zhao, Zhi-Qing^1 ; Ren, Nan-Qi^1

Harbin Institute of Technology, Harbin

150090, China^1

关键词: Boxbehnken design (BBD);    Continuous-flow experiments;    Controlling parameters;    Excess sludge production;    Sewage treatment efficiencies;    Sludge production;    Wastewater discharge;    Wastewater treatment technologies;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/120/1/012021/pdf
DOI  :  10.1088/1755-1315/120/1/012021

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Redundant excess sludge production and considerable non-standard wastewater discharge from existing activated sludge processes are facing more and more challenges. The investigations on lower sludge production and higher sewage treatment efficiency are urgently needed. In this study, an anaerobic/anoxic/micro-aerobic/oxic-MBR combining a micro-aerobic starvation sludge holding tank (A2MMBR-M) system is developed. Batch tests on the optimization of the staged dissolved oxygen (DO) in the micro-aerobic, the first oxic, and the second oxic tanks were carried out by a 3-factor and 3-level Box-Behnken design (BBD). The optimal actual values of X1, X2, and X3were DO1of 0.3-0.5 mg/L, DO2of 3.5-4.5 mg/L, and DO3of 3-4 mg/L. After the optimization tests, continuous-flow experiments of anaerobic/anoxic/oxic (AAO) and A2MMBR-M systems were further conducted. Compared to AAO system, a 37.45% reduction in discharged excess sludge in A2MMBR-M system was achieved. The COD, TN, and TP removal efficiencies in A2MMBR-M system were respective 4.06%, 2.68%, and 4.04% higher than AAO system. The A2MMBR-M system is proved a promising wastewater treatment technology possessing enhanced in-situ sludge reduction and improved effluent quality. The staged optimized DO concentrations are the key controlling parameters for the realization of simultaneous in-situ sludge reduction and nutrient removal.