低浓度铬对SBR中微生物抑制影响研究  

Inhibition effect of low concentration chromium on the microorganism of SBRs

作　　者：汪敏刚[1] 孙培德[1] 罗涛[1] 鲁轩余 

机构地区：[1]浙江工商大学环境科学与工程学院,杭州310012

出　　处：《环境科学学报》2016年第6期1979-1985,共7页Acta Scientiae Circumstantiae

基　　金：浙江省科技计划项目(No.2014C03002);浙江工商大学研究生科技创新项目(No.3070KZN0215075)~~

摘　　要：研究了低浓度铬(三价和六价)对SBR生物系统的抑制影响,考察了两种不同SBR工艺(传统工艺和分段进水工艺)在处理含低浓度铬废水过程中常规的出水水质和活性污泥性状的变化,以及微生物群落的变迁.研究结果表明,在进水总铬(Cr(III)∶Cr(VI)=4∶1)浓度为0.5mg·L-1的条件下,传统工艺和分段进水工艺的氨氮去除率由99%分别下降至70%和65%,同时,磷酸盐去除率也由99%分别下降至51%和43%.当进水中总铬浓度达到1 mg·L-1时,分段进水工艺SBR系统的氨氮和磷酸盐去除率最终分别下降至44%和37%.此外,多糖和蛋白质的分泌量变化分别呈下降和上升趋势.高通量测序结果表明,活性污泥细菌群落丰富度和多样性受到了铬离子的影响,并且Nitrospira、Acidobacteria、Planctomycetes、Cyanobacteria和Candidatus_Accumulibacter等脱氮除磷功能菌种的生长都受到了一定程度的抑制,也与被抑制的SBR系统脱氮除磷去除率下降的宏观现象相吻合.In order to study the effect of chromium（ trivalent and hexavalent） on SBRs with different strategies（ general and step-feeding）,the water quality indicators,properties of activated sludge,and variation of bacteria communities were investigated. With 0.5 mg·L^-1chromium（ 80% trivalent and20% hexavalent） in influent,the ammonia nitrogen removal efficiency of SBRs with general strategy and step-feeding strategy reduced from 99% to 70%and 65% respectively,while the phosphorus removal efficiency reduced from 99% to 51% and 43% respectively.With 1 mg·L^-1 chromium in influent,the ammonia nitrogen and phosphorus removal efficiency of SBR with step-feeding strategy decline from 99% to 44% and 37% respectively. Moreover,the polysaccharides presented decrease trend while proteins presented increase trend. Results of high-throughput sequencing analysis revealed that richness and diversity of bacteria communities and same functional bacteria of nutrient removal process,such as Nitrospira、Acidobacteria、Planctomycetes、Cyanobacteria and CandidatusAccumulibacter,were inhibited. This was consistent with the macro-phenomena.

关 键 词：铬离子 脱氮除磷 SBR 高通量测序 细菌群落 

分 类 号：X703[环境科学与工程—环境工程]