摘要
在5个SBR反应器中,通过对好氧颗粒污泥污染物去除功效、颗粒形态结构与粒径以及胞外聚合物组成的跟踪分析,研究Cr(VI)质量浓度0、1、3、5和10mg/L长期作用(历时65 d)对好氧颗粒污泥稳定性的影响。结果表明,好氧颗粒污泥对质量浓度3mg/L以下的Cr(VI)长期作用具有良好的抵御机制,而质量浓度5mg/L以上Cr(VI)则严重威胁好氧颗粒污泥的稳定性,使其结构趋于扁平化并逐渐解体。虽然Cr(VI)质量浓度越高各反应器的COD和TN去除率下降趋势愈明显,但在实验末期,各反应器对COD和TN仍保持着较高去除率,分别为97.43%、96.89%、95.43%、93.69%、90.46%和95.11%、94.31%、91.97%、87.68%、82.59%。EPS中胞外多糖在保护微生物、抵抗Cr(VI)毒害方面起主要作用,面临Cr(VI)胁迫,胞外多糖的含量明显增加,而胞外蛋白含量基本不变。胞外多糖与胞外蛋白比值的增加以及结构性多糖的消耗是降低好氧颗粒污泥结构稳定性的重要因素。
The long-term effects of Cr（Ⅵ） （0, 1, 3, 5 and 10 mg/L） on the substrate removal, granular morphology and diameter, and extracellular polymeric substances （EPS） of aerobic granular sludge were investigated in five sequencing batch reactors （SBRs）. Results showed that the effect of Cr （Ⅵ） under 3 mg/L could be withstood by the aerobic granular sludge, while the granular became unstable and gradually collapsed with more than 5 mg/L Cr（Ⅵ）. The removal efficiency of COD and total nitrogen （TN） decreased with an increase of the Cr（Ⅵ） concentration, while the high removal efficiency of COD and TN could been maintained at 97.43%, 96.89%, 95.43%, 93.69%, 90.46% and 95.11%, 94.31%, 91.97%, 87.68%, 82.59%, respectively in Cr （Ⅵ）-induced 65 days. The extracellular polysaccharide played the main role in protecting microorganism and resisting the toxicity ofCr （Ⅵ）. With the stress of Cr（Ⅵ）, the aerobic granular sludge significantly increased but extracellular protein remained stable. The increase of the ratio of polysaccharide and protein and the consumption of polysaccharide were the key factors that reduced the structural stability of aerobic granular sludge.
出处
《水处理技术》
CAS
CSCD
北大核心
2015年第2期27-31,36,共6页
Technology of Water Treatment
基金
国家自然科学基金(51208174)
水体污染控制与治理科技重大专项(2012ZX07506-002-2)
关键词
好氧颗粒污泥
Cr(Ⅵ)
长期胁迫
污泥结构
污泥稳定性
胞外聚合物
aerobic granular sludge
Cr（VI）
long-term stress
granular structure
sludge stability
extracellular polymeric substances
