采用溶菌酶和鼠李糖脂联合处理对剩余活性污泥进行水解和分解：pH 的影响。
Hydrolysis and decomposition of waste activated sludge with combined lysozyme and rhamnolipid treatment: Effect of pH.
机构信息
School of Civil and Transportation, Hebei University of Technology, Tianjin 300401, China; School of Environment, Harbin Institute of Technology, Harbin 150090, China.
School of Civil and Transportation, Hebei University of Technology, Tianjin 300401, China.
出版信息
Bioresour Technol. 2019 Dec;293:122074. doi: 10.1016/j.biortech.2019.122074. Epub 2019 Aug 28.
Effect of pH on waste activated sludge (WAS) hydrolysis and decomposition treating with lysozyme and rhamnolipid combined (Ly + RL) was investigated in this study. Results showed that Ly + RL system could significantly improve the release of soluble organic matters at the optimal RL dosage of 0.3 g/gSS and lysozyme dosage of 0.15 g/gSS. Alkali conditions showed better effect than that of acid on the release of soluble organics, improvement of WAS biodegradability and reduction of big floc size within Ly + RL treatment system and the optimal pH was 10. And 9591.6 mg/L soluble chemical oxygen demand (SCOD), 1612.0 mg/L protein and 1211.6 mg/L polysaccharide were released at pH10 after 12 h co-digestion. 83.7% bacteria and 92.2% archaea were decomposed at pH10. Class Gammaproteobacteria (82.4%) was the predominant bacteria after treated by Ly + RL system, and the treated WAS was beneficial for the subsequent organics bio-degradation and volatile fatty acids accumulation.
本研究考察了 pH 值对溶菌酶和鼠李糖脂联合（Ly+RL）处理剩余活性污泥（WAS）水解和分解的影响。结果表明，在最佳 RL 投加量 0.3g/gSS 和溶菌酶投加量 0.15g/gSS 下，Ly+RL 体系能显著提高可溶性有机物的释放。碱性条件比酸性条件更有利于可溶性有机物的释放、WAS 生物降解性的提高和 Ly+RL 处理体系中大絮体尺寸的减小，最佳 pH 值为 10。在 12h 共消化后，pH10 时可释放出 9591.6mg/L 的可溶性化学需氧量（SCOD）、1612.0mg/L 的蛋白质和 1211.6mg/L 的多糖。在 pH10 下，83.7%的细菌和 92.2%的古菌被分解。经 Ly+RL 体系处理后，属水平优势菌为γ变形菌纲（Gammaproteobacteria）（82.4%），处理后的 WAS 有利于后续有机物的生物降解和挥发性脂肪酸的积累。
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