纳米塑料对好氧/缺氧生物反硝化脱氮系统的影响探究  

Effect of Nanoplastics on Biological Aerobic/Anoxic Denitrification System

作　　者：李曼 祁丽 彭静波 LI Man;QI Li;PENG Jingbo(Department of Environmental Engineering,Henan vocational college of water conservancy and environment,Zhengzhou 450008,China;School of Environmental and Municipal Engineering,Tianjin Chengjian University,Tianjin 300384,China;CHN Energy Xingyang Thermal Power Co.,Ltd,Zhengzhou 450100,China)

机构地区：[1]河南水利与环境职业学院环境工程系,河南郑州450008 [2]天津城建大学环境与市政工程学院,天津300384 [3]国能荥阳热电有限公司,河南郑州450100

出　　处：《水处理技术》2024年第8期134-139,144,共7页Technology of Water Treatment

基　　金：国家自然基金青年基金(2018Z140418);天津市教委科研项目(2019KJ110);横向课题:农村污水处理一体化设备的升级改造(2021H0_0174)。

摘　　要：为了探究纳米塑料(NPs)对好氧/缺氧生物反硝化脱氮性能的影响,设置四组序批式反应器(SBR),通过控制进水NPs含量(0~2000μg/L),在30~35℃环境下考察了NPs对SBR内污染物去除和生物脱氮性能、污泥特征及微生物群落特征的影响。结果表明,低浓度NPs未能影响生物脱氮,而超过500μg/L NPs降低了污染物及生物脱氮性能。高浓度NPs降低了污泥内混合液总悬浮固体浓度及有机质占比,并降低了污泥沉降性。NPs能提高污泥胞外聚合物含量并增加其内蛋白质和多糖含量,在2000μg/L NPs内,EPS含量提高至105.2~112.5 mg/g,PN和PS含量分别提高至70.9~71.8 mg/g和39.8~42.5 mg/g。典型周期研究发现NPs促进了NO_(2)^(-)-N和NO_(3)^(-)-N的积累。高浓度NPs降低了比耗氧速率,抑制微生物代谢。微生物群落结果研究表明NPs降低Proteobacteria、Bacteroidota的相对丰度。研究结果为生物脱氮系统处理含NPs废水提供了一定的理论依据。In order to explore the effect of nano-plastic (NPs) on biological aerobic/anoxic denitrification,four groups of sequencing batch reactors(SBR) were set up,and the effects of NPs on pollutant removal and biological nitrogen removal,sludge characteristics and microbial community characteristics of SBR were investigated at 30~35℃by controlling the influent NPs content (0~2 000μg/L).The results showed that low concentration of NPs did not affect biological denitrification,while more than 500μg/L NPs decreased pollutant and biological denitrification performance.High concentration of NPs decreased the total suspended solid concentration and the proportion of organic matter in the mixed liquor,and reduced the settling ability of the sludge.NPs could increase the extracellular polymer content and the content of protein and polysaccharide in sludge.In 2 000μg/L NPs,the EPS content and PS content increased to 105.2~112.5 mg/g,PN and 39.8~42.5 mg/g,respectively.Typical cycle studies found that NPs promoted the accumulation of NO_(2)~--N and NO_3~--N.High concentration of NPs decreased the specific oxygen consumption rate and inhibited microbial metabolism.The results of microbial community showed that NPs decreased the relative abundance of Proteobacteria and Bacteroidota.The results provide a theoretical basis for biological denitrification system to treat wastewater containing NPs.

关 键 词：生物脱氮 纳米塑料 反硝化 污泥特征 微生物 

分 类 号：X703[环境科学与工程—环境工程]