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Effect of woody and non-woody bulking agents on biodrying of long-term storage sludge

机译：木质和非木质填充剂对长期存储污泥生物干燥的影响

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摘要

Storage sludge is associated with a range of environmental problems and biodrying such sludge via exothermic microbial decomposition can improve its stability and quality and decrease its mass. Bulking agents can be mixed with storage sludge to increase biodrying performance, but no studies have yet investigated differences between woody and non-woody bulking agents in the biodrying of storage sludge. This study investigated storage sludge mixed with four types of bulking agent, both woody (sawdust, wood shavings and pin chips) and non-woody (straw). Variations in temperature, moisture content, organic components, element contents, microbial populations and lignocellulase activity were measured under the laboratory scale for a period of 18 d. Straw performed better than woody bulking agents. It had the highest water removal capacity, followed by sawdust, wood shavings and pin chips. In such straw-sludge samples, the highest temperature reached 57.1 degrees C, the moisture content decreased from 71.83% to 56.89%, and the volatile solids (VSs) decreased from 60.95% to 51.01% while the moisture content only decreased from 69.34% to 64.91% in pin chips-sludge samples. Water soluble components, hemicellulose and cellulose decreased while humus increased in all treatments during biodying process, indicating that the biodrying process can improve the stability of storage sludge. Bacteria and actinomycetes had similar trends during the biodrying process, while fungi decreased. Carboxymethyl cellulase, lignin peroxidase and xylanase played key roles in lignocellulose degradation.
机译：储存污泥与一系列环境问题有关，通过放热微生物分解对此类污泥进行生物干燥可以提高其稳定性和质量并降低其质量。可以将填充剂与存储污泥混合以提高生物干燥性能，但是尚无研究调查木质污泥和非木质膨胀剂在存储污泥生物干燥中的差异。这项研究调查了存储污泥与四种填充剂混合的情况，这些填充剂是木质的（木屑，刨花和针屑）和非木质的（秸秆）。在实验室规模下，在18天的时间内测量温度，水分含量，有机成分，元素含量，微生物种群和木质纤维素酶活性的变化。稻草的性能优于木质填充剂。它具有最高的除水能力，其次是锯末，刨花和销屑。在这种秸秆污泥样品中，最高温度达到57.1摄氏度，水分含量从71.83％降低到56.89％，挥发性固体（VSs）从60.95％降低到51.01％，而水分含量仅从69.34％降低到51.01％。针屑-污泥样品中占64.91％。在生物染色过程中的所有处理中，水溶性成分，半纤维素和纤维素减少而腐殖质增加，这表明生物干燥过程可以提高存储污泥的稳定性。在生物干燥过程中，细菌和放线菌具有相似的趋势，而真菌则减少。羧甲基纤维素酶，木质素过氧化物酶和木聚糖酶在木质纤维素降解中起关键作用。

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