Micron-sized silica particles in wastewater influenced the distribution of organic matters in sludge and their anaerobic degradation
Micron-sized silica particles in wastewater influenced the distribution of organic matters in sludge and their anaerobic degradation
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废水中微米级二氧化硅颗粒影响污泥中有机物的分布及其厌氧降解
DOI：
10.1016/j.jhazmat.2020.122340
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发表时间：
2020
影响因子：
13.6
通讯作者：
Xiaohu Dai
中科院分区：
文献类型：
--
作者：
Sisi Chen;Bin Dong;Dianhai Yang;Ning Li;Xiaohu Dai
研究了微米级二氧化硅颗粒对污泥中有机质分布及污泥中大分子有机组分（MOCs）厌氧降解的影响。随着微米级颗粒的加入（VS/TS从90.46 ± 0.21%逐渐降低到33.36 ± 0.17%），蛋白质降解率显著提高，多糖降解率受到抑制，导致MOCs总降解量和甲烷产量先升高（提升幅度在10%以内），后略有下降，VS/TS峰值为56.03 ± 0.21%。污泥中有机物分布的显著变化引起了蛋白质和多糖降解率的变化。随着微米级二氧化硅颗粒的加入，EPS的分子量和EPS中蛋白质的二级结构变化不大，影响不大。细胞外蛋白质含量的提高（即总蛋白质含量）和细胞外碳水化合物含量的降低（即总多糖含量）与蛋白质降解的增强和多糖降解的抑制密切相关。结果表明，污泥中大量的砂砾可能不是中国污水污泥可降解性较低的主要原因。
The influence of micron-sized silica particles on the distribution of organic matters in sludge and anaerobic degradation of macromolecular organic components (MOCs) in sludge was investigated. With the addition of micron-sized particles in the influent (VS/TS decreased gradually from 90.46 ± 0.21 % to 33.36 ± 0.17 %), the protein degradation percentage was significantly promoted while the polysaccharides degradation percentage was largely inhibited, resulting in the total MOCs degradation and methane production increasing firstly (with the promotion extent within 10 %) and then declining slightly, with the peak value at VS/TS of 56.03 ± 0.21 %. The shifted degradation percentage of protein and polysaccharides were caused by the significant changed distribution of organic matters in sludge. With the addition of micron-sized silica particles, the MW of EPS and secondary structure of protein in EPS changed little, which brought about little influence. While, the promoted extracellular protein content (so that the total protein content) and declined extracellular carbohydrates content (so that the total polysaccharides content), were found to be strongly correlated to the enhanced protein degradation and inhibited polysaccharides degradation. The results suggested that large amounts of grit in sludge might not be the main reason for lower degradability of sewage sludge in China.