ZHENG Jun,WANG Meng-lin,ZHANG De-wei,et al. Effect of Non-bubble Aerated Membrane Bioreactor on Domestic Wastewater Treatment [J].China Water & Wastewater,2020,36(13):55-61.
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Effect of Non-bubble Aerated Membrane Bioreactor on Domestic Wastewater Treatment

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第36卷 Number: 13 Page: 55-61 Column: Date of publication: 2020-07-01
Author(s):
(1. School of Energy and Enviroment， Anhui University of Technology, Ma’anshan 243002, China;
2. Anhui Huaqi Environmental Protection Technology Co. Ltd., Ma’anshan 243061, China;
3. Anhui Province Biological Aerated Filter <BAF> Engineering Technology Research Center, Ma’anshan 243061, China)
Keywords:
non-bubble aeration; membrane bioreactor; domestic wastewater; influence factor; transformation pathway of carbon and nitrogen
Abstract:
A membrane bioreactor with hydrophobic microporous membrane as the carrier of nonbubble aeration and biofilm was designed and developed,and it was applied to treat the actual domestic wastewater with low carbon and nitrogen ratio.The influence of hydraulic residence time (HRT), aeration mode and water temperature on the treatment efficiency of the reactor was studied,and the transformation pathways of carbon and nitrogen elements were explored.The average removal efficiencies of COD,NH+4-N and total nitrogen reached 85.43%, 72.22% and 57.95% when HRT was 24 h, flow velocity was 0.068 m/s, water temperature was 28-36 ℃, DO was (1.6±0.2) mg/L and aeration intensity was 0.035 MPa. During the transformation of carbon and nitrogen,simultaneous nitrification and denitrification took place when sewage passed through biofilm with different oxygen concentration gradients formed by nonbubble aeration. The removal of NH+4-N was mainly completed by nitrifying bacteria,and the removal rate was 72.18%. Meanwhile,the removal efficiency of TN was approximately 56%. During the denitrification process, COD was mainly consumed as a carbon source and its removal efficiency was more than 85%. The main energy consumption of the reactor was air compressor power consumption, circulating pump power consumption and intake diaphragm pump power consumption. The oxygen mass transfer coefficient of nonbubble aeration was 8.7 times of that of traditional bubble aeration, and the potential energy consumption of nonbubble aeration could be saved up to 88.5%.
Last Update: 2020-07-01