期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2015
卷号：6
期号：8
页码：2206-2220
出版社：University of Mohammed Premier Oujda
摘要：In this work, the physico-chemical characteristics of activated sludge from domestic sewage treatment plants were first determined. The composting of waste activated sludge alone (100% w/w) and in presence of sawdust (25% w/w) during nine months was then investigated. Aerobic fermentatio n was monitored during the first month in reactors. After that, samples were transferred in p erforated bags for eight months to reach maturation. Two aerobic composting reactors (silos) were used simultaneously and under the same conditions (air-flow 20 L/h and external ambient temperature 25 ± 2°C). In order to control biotransformation processes, composting was monitored by determining physico-chemical and microbiological parameters. The evolution of the parameters analyzed (temperature, moisture, pH, organic matter, C/N ratio, nitrogen and carbon) during the nine months of co mposting process demonstrate the stability and maturity of obtained compost. In the system without sawdust material, the maximum temperature was 40°C. However, the mixture sludge/sawdust 75:25 reaches thermophilic conditions with a maximum temperature of about 58°C, thus providing a b est degradation. According to germination index, waste activated slud ge mixed with the aforementioned carpentry waste provided compost with visibly positive properties for agricultural use. The addition of sawdust to sludge decreases considerably the number of co liforms in compost; this is mainly due to the effect of dilution and to the level of temperature reached.
关键词：Waste activated sludge; Sawdust; Composting; Co;composting; Process monitoring
