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- Title
Effect of woody and non-woody bulking agents on biodrying of long-term storage sludge.
- Authors
Tiantian Liu; Junguo He; Chongwei Cui; Jian Tang; Mengfei Wang
- Abstract
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°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.
- Subjects
BIODRYING; SLUDGE bulking; CARBON content of water
- Publication
Desalination & Water Treatment, 2018, Vol 129, p53
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2018.22815