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Improvement of activated sludge dewatering properties using green conditioners: chitosan hydrochloride and lysozyme

机译：使用绿色护发素改善活性污泥的脱水性能：壳聚糖盐酸盐和溶菌酶

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In this study, the effects of chitosan hydrochloride (CTSCL), lysozyme (LZM) and cationic polyacrylamide (CPAM) as conditioners on the dewatering performance of activated sludge were comparatively investigated in terms of the capillary suction time (CST), specific resistance to filtration (SRF) and water content after conditioning and subsequent dewatering. CTSCL showed nearly the same capacity to improve the sludge dewaterability as CPAM, with CTSCL and CPAM conditioning resulting in the SRF of sludge decreasing by 95.82% and 96.15%, CST decreasing by 78.22% and 84.88%, and water content of the dewatered sludge decreasing by 10.84% and 8.5%, respectively. However, LZM conditioning exhibited the best improvement in the dewatering extent, which could decrease the water content of dewatered sludge by 19.84%. In addition, the evolution of the physical properties, extracellular polymeric substance content and composition, and the sludge floc morphology were analyzed to explain the sludge conditioning mechanism. Both CTSCL and CPAM could extrude sludge surface bound water into free water, produce sludge flocs with a larger size and more surface pores and finally improve the sludge filterability. In comparison with chemical flocculants, the conditioning mechanism of LZM was distinctly different, which effectively decomposed cell walls, released the internal bound water beneficial for improving the sludge dewatering extent, while the released organic substances clogged the floc surface, and the high proportion of fine particles in the flocs resulted in poorer filtration.
机译：在这项研究中，比较了壳聚糖盐酸盐（CTSCL），溶菌酶（LZM）和阳离子聚丙烯酰胺（CPAM）作为调节剂对活性污泥脱水性能的影响，从毛细抽吸时间（CST），比抗过滤性方面进行了比较。 （SRF）和调节后的水分含量，然后进行脱水。 CTSCL的污泥脱水能力与CPAM几乎相同，通过CTSCL和CPAM调节，污泥的SRF分别降低了95.82％和96.15％，CST降低了78.22％和84.88％，脱水污泥的含水量降低了分别增加了10.84％和8.5％。然而，LZM调理在脱水程度方面表现出最好的改善，这可以使脱水污泥的含水量降低19.84％。此外，分析了物理性质，细胞外聚合物含量和组成的演变以及污泥絮凝形态，以解释污泥调节的机理。 CTSCL和CPAM均可将污泥表面结合的水挤出成自由水，产生更大的污泥絮凝物和更多的表面孔隙，最终提高污泥的过滤性。与化学絮凝剂相比，LZM的调节机理明显不同，它可以有效分解细胞壁，释放出内部结合水，有利于提高污泥的脱水程度，而释放出的有机物则堵塞了絮凝物表面，且细粉比例高。絮状物中的颗粒导致过滤效果较差。

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