不同C/N条件下纳米零价铁对反硝化颗粒污泥性能的影响  

Effects of nanoscale zero-valent iron on performance of denitrifying granular sludge at different C/N ratios

作　　者：王翻翻[1] 钱飞跃[1,2,3] 沈耀良[1,2,3] 王建芳[1,2,3] 夏莲[1] 沈诗捷 

机构地区：[1]苏州科技学院环境科学与工程学院,苏州215009 [2]江苏省环境科学与工程重点实验室,苏州215009 [3]江苏省水处理技术与材料协同创新中心,苏州215009

出　　处：《环境工程学报》2016年第6期2833-2839,共7页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51308367);江苏省高校自然科学研究基金项目(15KJB610013);江苏高校优势学科建设工程资助项目;苏州科技学院研究生创新工程项目(SKCX14-019)

摘　　要：为了探明纳米零价铁(nZVI)在反硝化处理系统中的"剂量-效应"关系,采用批次实验,考察了不同C/N比条件下,nZVI投加量(0~100 mg/L)对反硝化颗粒污泥(DGS)脱氮性能的影响,分析了氮素形态、比反硝化速率(μ值)、胞外聚合物(EPS)组成及铁元素分布的变化规律。结果表明,当原水中nZVI浓度高于5 mg/L时,DGS对硝态氮和COD去除率均出现下降,导致剩余亚硝态氮浓度上升。在不同C/N比条件下,nZVI对DGS比反硝化速率的抑制符合Haldane模型,R^2在0.944~0.995之间。随着C/N比的增大,颗粒污泥对nZVI的吸附量明显提高,抑制系数(KIH)大幅降低,DGS对nZVI抑制作用的抗性逐渐减弱。当nZVI投加量超过25 mg/L时,EPS中蛋白质与多糖含量开始下降,这不利于维持DGS颗粒结构的稳定性。To explore the dose-response relationship of nanoscale zero-valent iron（ n ZVI） in biological denitrification systems,the effects of n ZVI dosage（ 0 mg / L to 100 mg / L） on the performance of denitrifying granular sludge（ DGS） at different C / N ratios were investigated in this study. During the study,the transformation of nitrogen forms,the specific denitrifying rates（ μ values）,the composition of extracellular polymeric substances（ EPS）,and the distribution of elemental iron were analyzed in detail. The results showed that the removal efficiencies of nitrate nitrogen and COD decreased with n ZVI dosages higher than 5 mg / L,whereas the residual concentration of nitrite nitrogen increased significantly. Moreover,the inhibition of n ZVI dosages on the specific denitrifying rates was well fitted by the Haldane model,as the values of R^2 ranged from 0. 944 to 0. 995.In addition,both a higher adsorbing capacity and lower inhibition coefficient（ KIH） were observed with an increase in C / N ratios. This indicated that the resistance of DGS to n ZVI toxicity weakened gradually. When the dosage of n ZVI was higher than 25 mg / L,the concentrations of protein and polysaccharides in the EPS greatly decreased,which would decrease the structural stability of the granular sludge.

关 键 词：颗粒污泥 纳米零价铁 反硝化 C/N比 抑制作用 

分 类 号：X703[环境科学与工程—环境工程]