الفهرس 
acknowledgmentOnly 14 pages are availabe for public view
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Abstract
This study contains two main parts, during the first part, four windrows formed from raw dewatered sewage sludge (about 30% solids) and composted sewage sludge (about 85% solids) (3:1 v/v, mixing ratio, respectively). These windrows composted under the same conditions but differ in turning frequency which were: EW1 was turned every week, EW2 was turned every 10 days, EW3 was turned every 15 days, and EW4 was turned according to temperature measurements which was monitored to be between 55-65oC. Changes in physical, chemical and microbiological parameters during the composting process were studied. Effects of composts on germination and growth of plants were also studied.
Generally, it was found that turning frequency of more than once per week is more efficient than the turning frequency every week, 10 days, or 15 days. In such case more addition of water is needed to adjust the proper moisture content.
During the second part of this study which, studying the co-composting of sewage sludge with garden wastes and municipal solid waste, four windrows were tested: SC, formed from raw dewatered sewage sludge and composted sewage sludge as bulking agent; SGW, formed from raw dewatered sewage sludge and garden wastes as bulking agent; SMSW, formed from raw dewatered sewage sludge and municipal solid waste (refuse of Alexandria) as bulking agent and finally, SCSC, which was composted under site 9N operation conditions that formed from raw dewatered sewage sludge and composted sewage sludge as bulking agent. In all windrows the mixing ratio was 3:1 (v/v) raw dewatered sewage sludge: bulking agents. The first three windrows were composted under the same conditions and compared with the fourth one.
Generally, co-composting of sewage sludge with garden waste and municipal solid waste enhanced the physical, chemical, and microbiological parameters than composting of sewage sludge with composted sludge and gave high germination and growth parameters.