外源Ca^(2+)对SBR启动期活性污泥胞外多聚物的动态影响  

Evolution of Extracellular Polymeric Substances of the Activated Sludge with Calcium Ion Addition During Set-up Period of Sequencing Batch Reactors

作　　者：任丽飞 杨新萍[1] 张雯雯[1] 

机构地区：[1]南京农业大学资源与环境学院,南京210095

出　　处：《环境科学》2017年第6期2470-2476,共7页Environmental Science

基　　金：国家自然科学基金项目(31370539)

摘　　要：利用无机物如Ca^(2+),加快活性污泥反应器启动,强化活性污泥絮体性能和结构稳定性,受到越来越多的重视.采用序批式反应器,研究进水中添加Ca^(2+)对反应器启动期活性污泥沉降性能和胞外多聚物的影响.结果表明运行至28 d,与进水中不添加Ca^(2+)的反应器(对照反应器)相比,进水中添加150 mg·L^(-1)外源Ca^(2+)的反应器中活性污泥MLSS和MLVSS值分别高出了89.6%和75.6%,SVI值则降低了47.9%;活性污泥胞外多聚物总量增加了76.4%,多糖增加了28.8%,蛋白质减少了31.6%,添加150 mg·L^(-1)外源Ca^(2+)的反应器中污泥胞外多聚物中多糖/蛋白质值为68.8,对照反应器的活性污泥胞外多聚物多糖/蛋白质值仅为36.6.三维荧光光谱和红外光谱分析表明外源Ca^(2+)导致活性污泥胞外多聚物组分发生了变化.实验结果为进水中添加外源Ca^(2+)改善活性污泥沉降性能提供了基础数据.Great attention has been paid to accelerate the start-up period and enhance floc properties and structural stability in activated sludge reactors with the aid of inorganic chemical agents such as calcium ion. The laboratory-scale sequencing batch reactors （SBRs） were operated continuously for 35 days to investigate the effect of calcium ion （Ca2＋） on the physicochemical properties and evolution of extracellular polymeric substances （EPS） of activated sludge during set-up period. When compared to the control （non-calcium ion addition）, the addition of 150 mg·L-1Ca2＋ to the influent significantly increased the mixed liquid suspended solids （MLSS） and the mixed liquid volatile suspended solids （MLVSS） by 89.6% and 75.6% on 28 d, respectively, and decreased the sludge volume index （SVI） by 47.9% following SBRs set-up. Compared with the control system, the contents of EPS, polysaccharides （PS） and proteins （PN） were increased by 76.4%, 28.8% and 31.6% under the condition of Ca2＋ dosage of 150 mg·L-1. The PS/PN ratio was 68.8 for Ca2＋ addition, compared to only 36.6 for the control reactor. Analysis using three-dimensional excitation emission matrix fluorescence spectroscopy and Fourier transform infrared spectrum revealed that Ca2＋ addition changed the compositional characteristics of EPS. Results from this study provided a fundamental knowledge basis for the improvement of the settling properties of activated sludge with calcium ion addition.

关 键 词：活性污泥 启动期 胞外多聚物 沉降性能 动态变化 

分 类 号：X703.1[环境科学与工程—环境工程]