二氧化钛纳米颗粒对序批式反应器中活性污泥胞外聚合物产量及其组分的影响  

Effects of TiO_2 Nanoparticles on the Production and Composition of Extracellular Polymeric Substances in the Activated Sludge from A Sequencing Batch Reactor

作　　者：王雪礁 王森 李姗姗 李志伟[1,2] 徐巧燕 郑栋[1,2] 董俊伟 万一平 高孟春 WANG Xue-Jiao;WANG Sen;LI Shan-Shan;LI Zhi-Wei;XU Qiao-Yan;ZHENG Dong;DONG Jun-Wei;WAN Yi-Ping;GAO Meng-Chun(The Key Laboratory of Marine Environmental Science and Ecology,Ministry of Education,Ocean University of China,Qingdao 266100,China;School of Environmental Science and Engineering,Qingdao University,Qingdao 266071,China;College of Environmental Science and Engineering,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学海洋环境与生态教育部重点实验室,山东青岛266100 [2]中国海洋大学环境科学与工程学院,山东青岛266100 [3]青岛大学环境科学与工程学院,山东青岛266071

出　　处：《中国海洋大学学报（自然科学版）》2018年第4期111-119,共9页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(51178437)资助~~

摘　　要：研究了二氧化钛纳米颗粒(TiO_2 NPs)浓度变化对序批式反应器(SBR)性能及活性污泥胞外聚合物(EPS)特性的影响。结果表明,TiO_2 NPs浓度为0~5mg/L时SBR对COD平均去除率高于91.07%,但TiO_2 NPs浓度为10~60mg/L时对SBR对COD的去除产生轻微抑制。NH_4^+-N平均去除率在整个运行过程中均高于98.10%,表明TiO_2 NPs浓度小于60mg/L时对SBR中硝化过程没有影响。磷去除率随着TiO_2 NPs浓度从0mg/L增加到5mg/L而逐渐降低,随后在TiO_2 NPs浓度从10mg/L增加到60mg/L过程中出现了逐渐升高的趋势。活性污泥中松散附着EPS(LB-EPS)和紧密附着EPS(TB-EPS)产量随着进水TiO_2 NPs浓度从0 mg/L增加到60 mg/L而逐渐增加。LB-EPS和TB-EPS中蛋白质(PN)和多糖(PS)含量随着TiO_2 NPs浓度增加而增加。LB-EPS和TB-EPS的三维荧光(3D-EEM)光谱中代表芳环蛋白类物质、色氨酸蛋白类物质、胡敏酸类物质和富里酸类物质的荧光峰在不同TiO_2 NPs浓度下或增加或消失,且荧光峰位置和强度也发生了相应变化。LB-EPS和TB-EPS的傅里叶红外(FTIR)光谱中不同吸收峰的强度随着TiO_2 NPs浓度变化而变化,表明TiO_2 NPs对活性污泥中LB-EPS和TB-EPS的蛋白质和多糖中C=O键和C-H产生了影响。The performance and extracellular polymeric substances(EPS)of a Sequencing Batch Reactor(SBR)were investigated at different TiO 2 nanoparticles(TiO2NPs)concentrations.The average COD removal efficiencies of SBR were over 91.07%at 0~5 mg/L TiO2NPs,whereas the COD removal was slightly inhibited at 10~60 mg/L TiO2NPs.The average NH+4-N removal efficiencies were over 98.10%during the whole operational process,suggesting that the TiO2NPs concentrations less than 60 mg/L had no obvious effect on nitrification process.The phosphorus removal efficiency decreased with the increase of TiO2NPs concentration from 0~5 mg/L and then gradually increased with the increase of TiO2NPs concentration from 10~60 mg/L.The production of loosely-bound EPS(LB-EPS)and tightly bound EPS(TB-EPS)increased with the increase of TiO2NPs concentration from 0~60 mg/L.The contents of protein and polysaccharide in the LB-EPS and TB-EPS showed obvious changes with the increase of TiO2NPs concentration.Some fluorescence peaks representing aromatic protein-like substances,tryptophan protein-like substances,humic acid-like substances and fulvic acid-like substances of LB-EPS and TB-EPS at different TiO2NPs concentrations appeared or disappeared in the three-dimensional excitation-emission matrix(3D-EEM)fluorescence spectra,and the intensity and location of some peaks also varied at different operational stages.The intensities of different absorption peaks in the Fourier-transform infrared(FTIR)spectra varied at different TiO2NPs concentrations,indicating that the presence of TiO2NPs impacted on the C=O bond and C-H bond of protein and polysaccharide in the LB-EPS and TB-EPS.

关 键 词：二氧化钛纳米颗粒(TiO2NPs) 活性污泥 序批式反应器(SBR) LB-EPS TB-EPS 

分 类 号：X132[环境科学与工程—环境科学]