Impact of salinity on treatment of saline wastewater by sequencing batch biofilm reactor process
来源期刊：中南大学学报(英文版)2014年第5期
论文作者：LU Jie(卢杰) YAN Xue(闫雪) MA Yan-fei(马艳飞) TIAN Cai-xing(田彩星) DING Jin-cheng(丁金城)
文章页码：1989 - 1994
Key words：sequencing batch biofilm reactor; saline wastewater; microscopic examination; sludge acclimation; salinity shock
Abstract: High salinity industrial wastewater is difficult to treat using biological treatment system because of the high concentrations of salt. The potential of a sequencing batch biofilm reactor (SBBR) process in treating synthetic high salinity wastewater was evaluated at laboratory scale during a 110-day operation. The reactor was operated in a 12 h cycle, and each cycle consisted of 0.25 h influent addition, 8 h aeration, 3 h anoxic reaction, 0.5 h sedimentation and 0.25 h effluent withdrawal. Gradual increase in salinity gradient was applied during the acclimatization period. The acclimated SBBR system was demonstrated to be an effective process to remove organic compounds and ammonia nitrogen under high salinity conditions with chemical oxygen demand (COD) and ammonia nitrogen (NH3-N) removal efficiencies of 88% and 80%, respectively. The microscopic examination indicated that rather than rotifers or vorticella, the zoogloea, filamentous fungus mingled with a small quantity of swimming infusorians were dominant bacteria in SBBR system. The removal efficiencies close to 80% in COD and 75% in NH3-N were achieved at an organic loading rate (OLR) of 0.96 kg COD/(m3·d), pH of 7.0, salinity of 14 g/L and NH3-N of 30 mg/L.
LU Jie(卢杰)1, YAN Xue(闫雪)1, MA Yan-fei(马艳飞)1, TIAN Cai-xing(田彩星)2, DING Jin-cheng(丁金城)3
(1. Department of Resources and Environmental Engineering, Shandong University of Technology,
Zibo 255049, China;
2. School of Water Resources and Environment, China University of Geosciences, Beijing 100083, China;
3. Department of Chemical Engineering, Shandong University of Technology, Zibo 255049, China)
Abstract:High salinity industrial wastewater is difficult to treat using biological treatment system because of the high concentrations of salt. The potential of a sequencing batch biofilm reactor (SBBR) process in treating synthetic high salinity wastewater was evaluated at laboratory scale during a 110-day operation. The reactor was operated in a 12 h cycle, and each cycle consisted of 0.25 h influent addition, 8 h aeration, 3 h anoxic reaction, 0.5 h sedimentation and 0.25 h effluent withdrawal. Gradual increase in salinity gradient was applied during the acclimatization period. The acclimated SBBR system was demonstrated to be an effective process to remove organic compounds and ammonia nitrogen under high salinity conditions with chemical oxygen demand (COD) and ammonia nitrogen (NH3-N) removal efficiencies of 88% and 80%, respectively. The microscopic examination indicated that rather than rotifers or vorticella, the zoogloea, filamentous fungus mingled with a small quantity of swimming infusorians were dominant bacteria in SBBR system. The removal efficiencies close to 80% in COD and 75% in NH3-N were achieved at an organic loading rate (OLR) of 0.96 kg COD/(m3·d), pH of 7.0, salinity of 14 g/L and NH3-N of 30 mg/L.
Key words:sequencing batch biofilm reactor; saline wastewater; microscopic examination; sludge acclimation; salinity shock
