重庆理工大学学报2024，Vol.38Issue(15)：264-271,8.DOI:10.3969/j.issn.1674-8425(z).2024.08.031
典型微塑料对异养硝化-好氧反硝化菌的影响特性研究
Influence of common microplastics on heterotrophic nitrification and aerobic denitrification bacteria
摘要
Abstract
Microplastics are widely present in high-ammonia nitrogen wastewater,but their impact on heterotrophic denitrifying aerobic bacteria (HN-AD) remains unclear.In this study,Acinetobacter sp.TAC-1,a bacterium in HN-AD,is investigated to explore the effects of different types,sizes,and concentrations of typical microplastics on its growth activity and denitrification performance.Our study finds polypropylene (PP) and polyvinyl chloride (PVC) exhibits a slight promoting effect on TAC-1's growth and denitrification performance,with a maximum increase of 6.99％ and 5.7％ respectively,while polystyrene (PS) has some inhibitory effect,with the highest decrease being 13.22％.Polyethylene (PE) exerts no obvious impact on the bacteria.Under controlled particle size conditions,in the PS group,a particle size of 100 nm promotes bacterial growth but inhibits denitrification,while 30 μm inhibits growth but has no effect on denitrification.Under the influence of PP,almost all particle sizes promote both bacterial growth and denitrification capacity.Among these,the best growth occurs at 5 μm,but the strongest promotion of denitrification capacity is observed at 100 nm and 30 μm,with TN removal rates reaching 80.61％ and 77.72％ respectively.PE and PVC particle sizes both have a slight promoting effect on bacterial growth and denitrification,independent of particle size.In concentration-controlled experiments,PS concentrations of 1.0～2.0 g/L inhibit bacterial growth and denitrification,but at a concentration of 2.5 g/L,they promote bacterial growth and enhance denitrification,increasing by 2.3％.PP,PE,and PVC concentrations have no significant impact on bacterial growth and denitrification.Our study deepens our understanding of the denitrification process in environments co-polluted by microplastics and high-ammonia nitrogen wastewater and may provide some insights for the treatment and management of some polluted waters.关键词
微塑料/Acinetobacter sp.TAC-1/粒径/脱氮/毒性抑制Key words
microplastics/Acinetobacter sp.TAC-1/particle size/denitrification/toxicity inhibition分类
资源环境引用本文复制引用
徐福晴,苟芳,陈涣然,付文婷,李良杰,邢志林..典型微塑料对异养硝化-好氧反硝化菌的影响特性研究[J].重庆理工大学学报,2024,38(15):264-271,8.基金项目
重庆市教委科学技术研究项目(KJQN202201131) （KJQN202201131）
重庆理工大学研究生创新项目(gzlcx20223172) （gzlcx20223172）
