摘要
人工湿地工作效率和作用机制在低温环境下与在适温条件下存在较大差别,为探究水平潜流人工湿地与垂直潜流人工湿地在低温季节进行污水深度处理的效用与机制差异,构建了两组潜流人工湿地,分析其在不同碳氮比(C/N)条件下对有机物、总氮(TN)和总磷(TP)的净化效果,考察了湿地基质表面、植物根际微生物分布差异.结果表明,当进水COD浓度在37.50~80.00 mg·L^-1之间,总氮和总磷浓度在《城镇污水处理厂污染物排放标准》一级A标准内,以2 m^3·d^-1流量连续运行工况下:①水平潜流和垂直潜流人工湿地均表现出稳定的有机物降解能力,且对有机负荷有较强的抗冲击能力;②补充碳源可显著提升潜流人工湿地的去氮效率,添加碳源后,水平潜流人工湿地TN平均去除率高达76.01%,垂直潜流人工湿地TN平均去除率达到71.69%,但碳源的添加对磷的去除无明显影响,并且对水平潜流人工湿地污染物净化效果提升更显著;③分析两种类型湿地基质和植物根际的微生物群落结构发现,变形菌门、厚壁菌门和疣微菌门在两类湿地样品中均表现为优势菌门,两种湿地基质表面样品微生物群落结构组成差异大于植物根际样品,嗜氢菌属(Hydrogenophaga)、丹毒丝菌属(Erysipelothrix)和戴沃斯菌属(Devosia)对微生物群落差异贡献度最高;整体而言,垂直潜流人工湿地基质和植物根际微生物群落的物种多样性及丰富度高于水平潜流人工湿地.
There were significant differences in the working efficiency and mechanism of constructed wetlands between low temperature and suitable temperature conditions.This study designed a horizontal subsurface flow constructed wetland(HFCW)and a vertical subsurface flow constructed wetland(VFCW)to explore their performance differences in advanced treatment of sewage based on contaminant degradation analysis including the removal of organic matters,total nitrogen(TN),and total phosphorus(TP),as well as the analysis of microbial community structure.The results showed that when the COD concentration of influent was between 37.50 to 80.00 mg·L^-1,the concentration of total nitrogen and total phosphorus were within the first level A criteria specified in the discharge standard of pollutants for municipal wastewater treatment plant at the continuous flow of 2 m^3·d^-1:①Both HFCW and VFCW showed stable degradation ability of organic matter in influent and good resistance to high organic load.②Supplementation of the carbon source significantly improved the nitrogen removal efficiency of two subsurface flow constructed wetlands.HFCW achieved the average removal rate of TN at 76.01%,and the average removal rate of TN by VFCW reached 71.69%after the carbon addition.In contrast,dosage of an external carbon source showed limited effect on phosphorus removal.Furthermore,it worked more effectively for performance improvement of HFCW than that of VFCW.③The analysis of microbial community structure in wetland substrate and plant rhizosphere samples revealed that Proteobacteria,Firmicutes,and Verrucomicrobia were the dominant phylum in two series of wetland samples.For the dominant microbiota at the genus level,there were more significant differences in microbial community structure in wetland substrate samples than that in plant rhizosphere samples.Hydrogenophaga,Erysipelothrix,and Devosia contributed the most to the differences between the microbial communities of HFCW and VFCW.Overall,the species diversity and abundance of mic
作者
廖雪珂
严晗璐
王智源
陈诚
何东
吴月龙
陈求稳
LIAO Xue-ke;YAN Han-lu;WANG Zhi-yuan;CHEN Cheng;HE Dong;WU Yue-long;CHEN Qiu-wen(School of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Center for Eco-Environmental Research,Nanjing Hydraulic Research Institute,Nanjing 210029,China;Nanjing R&D Tech Group Co.,Ltd.,Nanjing 210029,China)
出处
《环境科学》
EI
CAS
CSCD
北大核心
2020年第12期5509-5517,共9页
Environmental Science
基金
国家自然科学基金项目(51809179)
江苏省水利科技项目(2017001ZB)。
关键词
人工湿地
低温
尾水
深度处理
外加碳源
微生物群落
constructed wetland
low temperature
tail water
advanced treatment
external carbon source
microbial community
