1.Lanzhou Jiaotong University;2.Lanzhou City Water Supply Group Co., Ltd;3.South China Institute of Environmental Science.MEE;4.Yantai University
the National Natural Science Foundation of China
本实验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)，重点考察了4种游离氨浓度(0.5, 5, 10和15 mg/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)]的影响。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%)。游离氨对三种胞外聚合物(LB-EPS, TB-EPS,总EPS)及其组分有显著影响。当游离氨浓度从0.5 mg/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，三种胞外聚合物及其组分的含量都跟NO- x-N有着相同的变化趋势。
To investigate the influences of free ammonia (FA) on the nitrogen removal performance, the contents of extracellular polymeric substances (EPS) and the chemical composition (proteins (PN), polysaccharides (PS), and DNA), four laboratory-scale sequencing batch reactors (SBRs) fed with synthetic wastewater were operated at FA concentrations of 0.5, 5, 10 and 15 mg/L (R0.5, R5, R10 and R15, respectively). Results showed that high nitrogen removal efficiencies (97.6-99.4%) were achieved under four FA concentrations. FA had a significant impact on the three kinds of EPS (loosely bound EPS (LB-EPS), tightly bound EPS (TB-EPS) and total EPS, respectively) and their composition. Results showed that with the increased of initial FA concentrations from 0.5 to 10 mg/L, the production of three kinds of EPS and their components were significantly increased. Further increased of FA concentrations to 15 mg/L caused a decreased trend of them. Moreover, PN was the main component of LB-EPS, while PS dominated in TB-EPS and total EPS under different FA concentrations. It was found that the contents of three kinds of EPS and their components illustrated a similar variation tendency to the NO- x-N contents during the whole cycle under four FA concentrations.