游离氨对活性污泥系统中脱氮性能及胞外聚合物的影响  

Effect of free ammonia on nitrogen removal and extracellular polymeric substances in the suspended activated sludge system

作　　者：蔡晨健 吴常峰 杨浩[1] 陈桐生 孙洪伟[1,4] CAI Chenjian;WU Changfeng;YANG Hao;CHEN Tongsheng;SUN Hongwei(School of Environmental and Municipal Engineering,LanzhouJiaotong University,Lanzhou 730070,P.R.China;Lanzhou City Water Supply Group Co.,Ltd,Lanzhou 730060,P.R.China;South China Institute of Environmental Science,MEE,Guangzhou 510655,P.R.China;School of Environmental and Material Engineering,Yantai University,Yantai 264005,Shandong,P.R.China)

机构地区：[1]兰州交通大学环境与市政工程学院,兰州730070 [2]兰州城市供水集团有限公司,兰州730060 [3]生态环境部华南环境科学研究所,广州510655 [4]烟台大学环境与材料工程学院,山东烟台264005

出　　处：《土木与环境工程学报（中英文）》2021年第1期184-192,共9页Journal of Civil and Environmental Engineering

基　　金：National Natural Science Foundation of China(No.51668031)。

摘　　要：以人工模拟废水为研究对象,采用4组SBR反应器(R0.5、R5、R10和R15),考察了4种游离氨浓度(0.5、5、10和15mg/L)对生物脱氮效能、胞外聚合物含量及其组分(蛋白质(PN)、多糖(PS)和核酸(DNA))影响。结果表明,4种游离氨浓度条件下都实现了较高的脱氮效果(97.6%~99.4%)。游离氨对3种胞外聚合物(LB-EPS、TB-EPS、总EPS)及其组分有显著影响。当游离氨浓度从0.5mg/L增加到10mg/L时,LB-EPS、TB-EPS、总EPS的含量及其组分的含量都显著增加;当游离氨浓度进一步增加到15mg/L时,LB-EPS、TB-EPS、总EPS的含量及其组分的含量都呈降低的趋势;在4个游离氨浓度下,PN是LB-EPS的主要成分,PS是TB-EPS和总EPS的主要成分;在4个游离氨浓度下的整个反应周期中,3种胞外聚合物及其组分的含量都跟NOx-—N有着相同的变化趋势。To investigate the influences of free ammonia on nitrogen removal,the contents of extracellular polymeric substances and the chemical composition(proteins,polysaccharides,and DNA),four laboratory-scale sequencing batch reactors fed with synthetic wastewater were operated at free ammonia concentrations of 0.5,5,10and 15mg/L(R0.5,R5,R10and R15,respectively).Results showed that high nitrogen removal efficiencies(97.6%~99.4%)were achieved under four free ammonia concentrations.Free ammonia had a significant impact on the three kinds of extracellular polymeric substance(loosely bound extracellular polymeric substance,tightly bound extracellular polymeric substance and total extracellular polymeric substance,respectively)and their composition.Results showed that with the increased of initial free ammonia concentrations from 0.5to 10 mg/L,the production of three kinds of extracellular polymeric substance and their components were significantly increased.Further increased of free ammonia concentrations to 15mg/L caused a decreased trend of them.Moreover,proteins were the main component of loosely bound extracellular polymeric substance,while polysaccharides dominated in tightly bound extracellular polymeric substance and total extracellular polymeric substance under different free ammonia concentrations.It was found that the contents of three kinds of extracellular polymeric substance and their components showed a similar variation tendency to the NOx-—N contents during the whole cycle under four free ammonia concentrations.

关 键 词：游离氨 脱氮 胞外聚合物 蛋白质 多糖 

分 类 号：X703.1[环境科学与工程—环境工程]