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Application of aerobic denitrifier for simultaneous removal of nitrogen, zinc, and bisphenol A from wastewater.
机构信息
Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-founded by Anhui Province and Ministry of Education, Provincial Key Laboratory of Biotic Environment and Ecological Safety in Anhui, School of Ecology and Environment, Anhui Normal University, Wuhu 241002, China; State Key Laboratory of Marine Pollution and Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong 999077, China.
State Key Laboratory of Marine Pollution and Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong 999077, China; National Observation and Research Station of Coastal Ecological Environments in Macao, Macao Environmental Research Institute, Macau University of Science and Technology, Macao 999078, China.
出版信息
Bioresour Technol. 2022 Jun;354:127192. doi: 10.1016/j.biortech.2022.127192. Epub 2022 Apr 20.
High concentrations of heavy metals and other pollutants affect microbial activity in the wastewater treatment system and impede biological denitrification process. In this study, a novel Zn(II)-resistant aerobic denitrifier (Pseudomonas stutzeri KY-37) was isolated with potential in Bisphenol A (BPA) biodegradation and removal. The capability of this denitrifier in removing nitrogen, zinc, and BPA was tested. Using 56 mg/L nitrate as the sole nitrogen source, its removal efficiency achieved 98.5% in 12 h. This novel denitrifier had a strong auto-aggregation (maximum 65.8%), a high hydrophobicity rate (maximum 88.2%), and a massive amount (maximum 41.1 mg/g cell dry weight) of extracellular polymeric substances (EPS) production. Moreover, Zn(II) removal efficiency reached more than 95% with the initial high concentrations of 200 mg/L. The maximum BPA removal efficiency reached 88.8% with initial 10 mg/L. The removal mechanism of BPA was further explored in terms of microbial degradation, EPS adsorption, and intermediate degradation products.
高浓度的重金属和其他污染物会影响废水处理系统中的微生物活性，并阻碍生物反硝化过程。在这项研究中，分离到了一株具有潜在双酚 A（BPA）生物降解和去除能力的新型耐锌好氧反硝化菌（Pseudomonas stutzeri KY-37）。测试了该反硝化菌去除氮、锌和 BPA 的能力。以 56mg/L 的硝酸盐作为唯一氮源，在 12 小时内去除效率达到 98.5%。这种新型反硝化菌具有较强的自动聚集能力（最大 65.8%）、较高的疏水性（最大 88.2%）和大量的胞外聚合物物质（EPS）产生（最大 41.1mg/g 细胞干重）。此外，当起始高浓度为 200mg/L 时，Zn(II)的去除效率超过 95%。当起始浓度为 10mg/L 时，BPA 的最大去除效率达到 88.8%。进一步从微生物降解、EPS 吸附和中间降解产物等方面探讨了 BPA 的去除机制。
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