摘要
为研究盐度对硝化菌的影响,以及硝化菌对盐度的抵抗机理,以模拟皮革废水为处理对象,考察了硝化菌硝化作用过程中的脱氮效率,脱氮数率,pH值,溶解氧,以及硝化菌胞外聚合物的含量与成分变化。结果表明在盐度逐步提高的情况下,出水氨氮从几乎检测不出升高到80 mg/L左右,硝化菌脱氮效率下降明显,并且有一定的规律性。pH值先降后升,溶解氧随着时间推移逐渐升高,但是随着盐度提高规律性越来越不明显。硝化菌所产生的胞外聚合物随着盐度提高,胞外聚合物总量有所提高,其主要成分含量发生变化,即多糖所占比例从35.2%升高到63.6%,蛋白质所占比例从58.8%减少到30.9%,从而影响活性污泥的絮凝性,从机理方面来解释盐度对硝化菌硝化作用的影响。
An experimental study was conducted to investigate the influence of salinity in wastewater on nitrifying bacteria with respect to their de-nitrification efficiency and rate. Wastewater samples containing salt were simulated tannery effluent prepared in the lab, in which changes of pH, DO and extracellular polymeric substances （EPS）of the de-nitrifying bacteria with the increases of salinity were studied. As salinity of the wastewater increased, so did EPS produced by the de-nitrifying bacteria, but EPS＇s major ingredients changed with the increase of portion of polysaccharides and decrease of protein. As a result, increased salinity affected flocculation of the activated sludge.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2012年第9期108-111,共4页
Environmental Science & Technology
基金
国家水体污染控制与治理科技重大专项(2009ZX07010-002-003.1)
