Unravelling the mechanism of ibuprofen's effect on aerobic granular sludge and its removal mechanism
TANG Yi, ZHANG Bing, FAN Jia-wei, SHI Wen-xin
Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing 400045, China
摘要 The mechanism of ibuprofen's (IBP) effect on aerobic granular sludge (AGS) was explored and the efficacy and mechanism of IBP removal by AGS system were analyzed. The presence of IBP had little effect on ammonia nitrogen removal in AGS system, and slightly inhibited the removal of organic matter, total nitrogen, and phosphorus. The AGS system was highly resistant to 0.5mg/L IBP, whereas 1.0~5.0mg/L IBP reduced the secretion of EPS, lowered the performance of sludge settleability, and affected the enrichment of functional bacteria, which was detrimental to the stability of the AGS system. The results of 120 consecutive days of experiment showed that AGS could remove 0.5~5.0mg/L of IBP through adsorption and degradation. Adsorption isotherm modelling indicated that AGS adsorbed IBP mainly through multilayer adsorption. The degradation pathways of IBP include decarboxylation and hydroxylation. The prolonged presence of IBP enhanced the proliferation of drug-resistant microorganisms, but altered the community structure and reduced microbial diversity and abundance, with Thiothrix, in particular, becoming the dominant genus. In conclusion, AGS technology has good application prospects for treating wastewater containing anti-inflammatory drugs (IBP), but the high concentration of IBP has a large negative effect on the performance of the AGS system, which requires more attentions.
Abstract：The mechanism of ibuprofen's (IBP) effect on aerobic granular sludge (AGS) was explored and the efficacy and mechanism of IBP removal by AGS system were analyzed. The presence of IBP had little effect on ammonia nitrogen removal in AGS system, and slightly inhibited the removal of organic matter, total nitrogen, and phosphorus. The AGS system was highly resistant to 0.5mg/L IBP, whereas 1.0~5.0mg/L IBP reduced the secretion of EPS, lowered the performance of sludge settleability, and affected the enrichment of functional bacteria, which was detrimental to the stability of the AGS system. The results of 120 consecutive days of experiment showed that AGS could remove 0.5~5.0mg/L of IBP through adsorption and degradation. Adsorption isotherm modelling indicated that AGS adsorbed IBP mainly through multilayer adsorption. The degradation pathways of IBP include decarboxylation and hydroxylation. The prolonged presence of IBP enhanced the proliferation of drug-resistant microorganisms, but altered the community structure and reduced microbial diversity and abundance, with Thiothrix, in particular, becoming the dominant genus. In conclusion, AGS technology has good application prospects for treating wastewater containing anti-inflammatory drugs (IBP), but the high concentration of IBP has a large negative effect on the performance of the AGS system, which requires more attentions.
唐怡, 张冰, 樊佳炜, 时文歆. 布洛芬对好氧颗粒污泥的影响及其去除机理[J]. 中国环境科学, 2024, 44(11): 6077-6087.
TANG Yi, ZHANG Bing, FAN Jia-wei, SHI Wen-xin. Unravelling the mechanism of ibuprofen's effect on aerobic granular sludge and its removal mechanism. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(11): 6077-6087.
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