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agricultural amount anaerobic digestion bench scale composters biological cadmium cellulose chemical COMPOST SCIENCE composting process composting rate cost crop decomposition developed digested sludge disposal dumping effect effluent Emmaus Engineering environment Environmental farm farmers feedlot fertilizer Figure free air space gallons garbage Golueke growth heavy metals humus inches incineration increased land landfill levels manure material ment method mixed refuse mixture moisture content municipal compost municipal refuse municipal solid waste municipal wastes nitrate nitrogen nutrients odors operation organic matter organic wastes oxygen paper pathogens percent phosphorus plastic plots pollution posting problem Public quantity reclamation recycling reduced resource recovery RODALE PRESS samples scrap seed sewage sludge sludge application soil soil conditioner Table temperature thermophilic tion toxic trogen truck ture utilization vegetation Virginia pine waste management wastewater windrow windrow composting zinc