GURui-huan,LIUXu-yang,BIXue-jun,et al.Effect of Aeration Distribution and Carrier Filling Rate on Oxygen Transfer Efficiency of MBBR[J].China Water & Wastewater,2023,39(1):1-8.
Effect of Aeration Distribution and Carrier Filling Rate on Oxygen Transfer Efficiency of MBBR
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第1期
Page:
1-8
Column:
Date of publication:
2023-01-01
- Keywords:
- moving bed biofilm reactor (MBBR); carrier filling rate; oxygen transfer efficiency; aeration intensity; valve opening of pipe
- Abstract:
- To investigate the effect of aeration distribution and carrier filling rate on oxygen transfer capacity of moving bed biofilm reactor (MBBR), the standard oxygen transfer efficiency (αSOTE) was selected as the evaluation index, and the optimal aeration distribution mode of a MBBR unit in a wastewater treatment plant in Qingdao was determined by orthogonal experiment. Under the condition of specific valve opening of the aeration system, the αSOTE at each test point along the aerobic tank with different filling rates (28%, 33%, 38% and 43%) was tested by off-gas method for 72 hours. Finally, the effect of carrier filling rate on the oxygen transfer capacity of MBBR was evaluated by the average αSOTE of the whole tank. Under the condition of large aspect ratio (2.6∶1) of MBBR and high flow velocity (36 m/h), the reverse push flow state was formed in the reactor to avoid carrier blockage when the medium aeration rate, low aeration rate and high aeration rate was adopted respectively in the inlet, middle area and outlet of MBBR. In addition, the coarse?bubble aeration could be closed when the carrier filling rate was low, so as to reduce the aeration intensity and saving energy consumption. With the carrier filling rate gradually decreasing from 43% to 28%, the average αSOTE of the whole MBBR was increased from 19.3% to 30.2%.
Last Update:
2023-01-01