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DOI: https://doi.org/10.4491/eer.2021.166
Technical evaluation and optimization of biological aerated filter (BAF) treating micro-polluted source water at low temperature
Dongmei Liu1, Xin Wang1, Xiaobo Li2, and Aiwen Wang1
1State Key Laboratory of Urban Resource and Environment(SKLUWRE),School of Environment, Harbin Institute of Technology, Harbin 150090, PR China
2Hangzhou Nandu Power Technology Co. LTD, Hangzhou 311100, PR China
Corresponding Author: Dongmei Liu ,Tel: +86-451-26283006 , Fax: +86-451-26283006, Email: ldm819@126.com
Received: April 2, 2021;  Accepted: May 30, 2021.
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ABSTRACT
In this study, polyethylene and zeolite, as media in two-stage biological aerated filters (BAF), were evaluated for simultaneous removal of ammonia nitrogen and organics in micro-polluted water under low temperature conditions. For specific source water, the contaminants removal characteristics are evaluated by single-factor experiment to determine the suitable pH, air-water ratio (AWR) and hydraulic load ratio (HLR). Ammonia nitrogen and permanganate index in BAFs were promoted effectively with pH = 7~8, AWR = 1.0:1.0~2.0:1.0, HLR = 1~4 m3/(m2·h), low pollution loads and a temperature of 10°C. Based on the response surface analysis, the optimum parameters were as follows: pH of 7.94, AWR of 1.41:1.0 and HLR of 1.39 m3/(m2·h), for simultaneous removal of ammonia nitrogen and permanganate index, their removal rates were respectively 59.76% and 18.16%. BAF has a great advantage in emergency treatment of low temperature micro-polluted water, and response surface analysis can be used to optimize operating parameters.
Keywords: BAF | Emergency treatment | Low temperature | Micro-polluted water | Response surface methodology
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