Performance and microbial characteristics of a novel pilot-scale tubing biological contact oxidation reactor for rural drinking water
Performance and microbial characteristics of a novel pilot-scale tubing biological contact oxidation reactor for rural drinking water
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DOI：
10.1016/j.jwpe.2021.102290
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发表时间：
2021-10
影响因子：
7
通讯作者：
Weng Qin;Yang Luo;Wen-tao Zhao;Yunlong Luo;Xing-Zhi Du;Z. Wang
中科院分区：
文献类型：
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作者：
Weng Qin;Yang Luo;Wen-tao Zhao;Yunlong Luo;Xing-Zhi Du;Z. Wang
农村条件下的饮用水处理往往要求结构紧凑、便于携带。为了解决这个问题，本研究开发了一个中试规模的螺旋管式生物接触氧化（BCO）反应器填充环形多孔生物膜载体（填料）。在（24.1 ± 3.4）°C、不同流量（1.86、3.72和7.2 L· h-1）条件下，对该系统处理模拟农村饮用水进行了212 d的考察，以确定该系统的处理效率和微生物特性。结果表明，进入稳定运行期后，氨（NH 4 +-N）去除率为（62.7 ± 9.3）%，UV 254吸收率为（19.5 ± 5.4）%。三维荧光激发发射矩阵光谱分析表明，水力停留时间（HRT）越短，对类胡萝卜素和富里酸的去除效果越差，HRT从16.8 h下降到4.2 h时，去除率从90%下降到0%.饮用水BCO反应器在常温（（24.1 ± 3.4）°C）下运行，启动时间较长（5.5个月），生物膜浓度和污染物去除性能均达到稳定状态。黄杆菌属和甲基杆菌属可能对BCO反应器中NOM的去除有显著贡献，而土壤微生物属和慢生根瘤菌属被推测负责氮转化。本研究为BCO反应器去除农村饮用水中氨氮和NOM的应用提供了新的见解。
Drinking water treatment under rural conditions often require compactness and portability. To address this, the present study developed a pilot-scale helical tubular biological contact oxidation (BCO) reactor filled with annular porous biofilm carriers (fillers). To determine the drinking water treatment efficiency and microbial characteristics, the system was investigated for 212 days at (24.1 ± 3.4) °C under different flow rates (1.86 L · h−1, 3.72 L · h−1, and 7.2 L · h−1) to treat simulated rural drinking water. The results show that (62.7 ± 9.3) % of ammonium (NH4+-N) and (19.5 ± 5.4) % of UV254absorbance were removed by the BCO reactor after entering the stable operation period. It is shown that shorter hydraulic retention time (HRT) weakened the removals of tryptophan-like substances and fulvic acid according to the three-dimension fluorescence excitation emission matrix spectroscopy, with the removal ratios decreased from 90% to 0% when the HRT declined from 16.8 h to 4.2 h. Despite operating at regular room temperature ((24.1 ± 3.4) °C), the drinking water BCO reactor underwent a long start-up period (5.5 months) to reach a steady state in terms of biofilm concentration and pollutant removal performance. GenusXanthobacterandMethylobacteriummight significantly contribute to the removal of NOM in the BCO reactor, while genusPedomicrobiumandBradyrhizobiumwere speculated to be responsible for nitrogen conversion. The present study provides new insights into the application of BCO reactors for ammonium and NOM removal from rural drinking water.