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Long-term nitrogen and phosphorus removal,shifts of functional bacteria and fate of resistance genes in bioretention systems under sulfamethoxazole stress

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Journal of Environmental Sciences 2023年第4期126卷 1-16页

作者： Yan Xu Danyi Zhang Qingju Xue chibin bu Yajun Wang Benchi Zhang YingWang Qingdong Qin Department of Municipal Engineering School of Civil EngineeringSoutheast UniversityNanjing 210096China Nanjing Institute of Geography&Limnology Chinese Academy of Sciences(NIGLAS)Nanjing 210008China Department of Gastroenterology Zhongda HospitalSchool of MedicineSoutheast UniversityNanjing 210096China School of Civil Engineering Lanzhou University of TechnologyLanzhou 730050China Department of Environmental Systems Engineering University of ReginaSK S4S0A2Canada

To understand the long-term performance of bioretention systems under sulfamethoxazole (SMX) stress, an unplanted bioretention system (BRS) and two modified BRSs with coconut-shell activated carbon (CAC) and CAC/zero-valent-iron (Fe^(0)) granules (CAC-BRS and Fe/CAC-BRS) were established. Both CAC-BRS and Fe/CAC-BRS significantly outperformed BRS in removing total nitrogen (TN)(CAC-BRS:82.48%;Fe/CAC-BRS:78.08%;BRS:47.51%), total phosphorous (TP)(CAC-BRS:79.36%;Fe/CAC-BRS:98.26%;BRS:41.99%),and SMX (CAC-BRS:99.74%, Fe/CAC-BRS:99.80%;BRS:23.05%) under the long-term SMX exposure (0.8 mg/L, 205 days). High-throughput sequencing revealed that the microbial community structures of the three BRSs shifted greatly in upper zones after SMX exposure.Key functional genera, dominantly Nitrospira, Rhodoplanes, Desulfomicrobium, Geobacter,were identified by combining the functional prediction by the FAPROTAX database with the dominant genera. The higher abundance of nitrogen functional genes (nirK, nirS and nos Z) in CAC-BRS and Fe/CAC-BRS might explain the more efficient TN removal in these two systems. Furthermore, the relative abundance of antibiotic-resistant genes (ARGs)sul I and sulII increased in all BRSs along with SMX exposure, suggesting the selection of bacteria containing sul genes. Substrates tended to become reservoirs of sul genes. Also,co-occurrence network analysis revealed distinct potential host genera of ARGs between upper and lower zones. Notably, Fe/CAC-BRS succeeded to reduce the effluent sul genes by1-2 orders of magnitude, followed by CAC-BRS after 205-day exposure. This study demon-strated that substrate modification was crucial to maintain highly efficient nutrients and SMX removals, and ultimately extend the service life of BRSs in treating SMX wastewater.

关键词： Bioretention system Sulfamethoxazole Coconut-shell activated carbon Zero-valent iron

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热连轧中间辊道加保温罩工艺分析

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武汉科技大学学报 2007年第2期30卷 128-131页

作者：卜恒勇赵刚余弛斌温盾魏钢城黄为民武汉科技大学材料与冶金学院湖北武汉430081 武汉钢铁(集团)公司湖北武汉430083

介绍热连轧带保温罩的中间输送辊道带坯温降数学模型的建立方法,对中间辊道加保温罩的保温工艺进行模拟分析。分析结果表明,该模型为实际工艺控制提供了理论依据。

关键词：中间辊道保温罩数学模型模拟分析

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