Comparison of foam characteristics in biological treatment units and water supply outlet of municipal wastewater treatment plant
WANG Fang-shu1, GUO Jia2, LI Ji-cheng3, YANG Chuan-xi1, MA Ying-zi1, DONG Xiao-wan1, CHEN Dong1
1. School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266525, China; 2. Qingdao Licun River Water Service Co., Ltd, Qingdao 266001; 3. Hunchun Municipal Bureau of Housing and Urban-Rural Development, Hunchun 133300, China
Abstract：This study comprehensively analyzed the foam characteristics of the samples collected from the aerobic tank (H), MBR tank (M), and ecological water supply outlet (B) of a wastewater treatment plant located at Qingdao regarding water quality index, organic components and microbial community structure. Compared with H and M, the TOC, TN, protein, UV254 and DO concentrations of the foam mixture collected from B were significantly higher, while its surface tension and viscosity were slightly lower. For the organic composition, the alkanes and fatty acids concentrations of B were much higher than that of H and M, while its BFK concentration was significantly lower. It was also found that the main organic component of the three sampling points was protein which might belong to Mucin and Nisin due to the high matching points. In comparison with H and M, the proportion of fulvic acid humus of B was higher, while its protein was lower. These results indicated that BFK was the primary foaming agent for H and M, and hydrophobic protein and fulvic acid humus were the main foaming agents. However, BFK and LCFAs were the dominating foaming agents for B, and alkanes, hydrophobic proteins and fulvic acid humus were the main foaming agents. It should be noted that the microbial community of B was significantly different from that of H and M. For the microbial composition at the phylum level, the proportion of Proteobacteria of B was up to 97.27%, while the main bacterial of H and M were Actinobacteriota, accounting for 58.5% and 47.9%, respectively. Moreover, the principal genera of B were g_unclassified_Acidovorax, s_uncultured_g_Undibacterium and Pseudomonas, while that of H and M were Skermania and Candidatus Microthrix.
王方舒, 郭佳, 李佶成, 杨传玺, 马英姿, 董晓婉, 陈栋. 城镇污水处理厂生化池与补水口泡沫特征比较[J]. 中国环境科学, 2023, 43(11): 5737-5745.
WANG Fang-shu, GUO Jia, LI Ji-cheng, YANG Chuan-xi, MA Ying-zi, DONG Xiao-wan, CHEN Dong. Comparison of foam characteristics in biological treatment units and water supply outlet of municipal wastewater treatment plant. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(11): 5737-5745.
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