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KMID : 1024519990080040509
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Journal of the Environmental Sciences
1999 Volume.8 No. 4 p.509 ~ p.514
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Physico-chemical Properties during Composting of Sewage Sludge and Livestock Manure in Static Piles System Composter
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Lee Hong-Jae
Sim Ju-Mi
Cho Ju-Sik
Lee Seong-Tae
Heo Jong-Soo
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Abstract
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The sewage sludges and livestock manures, respectively, were composted with sawdust used for control moisture in the static piles system composter. The variations of temperature, pH, moisture, C/N ratio, inorganic content, forms of organic materials and nitrogen, and contents of heavy metals were investigated. The results were summarized as follows ; The temperature for composting the sewage sludges reached the highest temperature of 52, after 3 days and lasted for 7 days, and then went down 3 after 52 days. In the case of composting livestock manures, the temperature reached to 63 after 10 days, that lasted for 10 days, and then went down gradually. After upsetting the sewage sludges and livestock manures for composting were decreased to 30% and 36%, respectively. The contents of inorganic matters and heavy metals were changed by the characteristics of raw materials but increased gradually during composting process. The total contents of organic materials in the sewage sludges and livestock manures for composting were decreased to 7% and 9%, respectively. The contents of ether extracts, resins, hemicellulose and cellulose were decreased but those of water soluble polysaccharides and lignins were not changed. The total contents of nitrogen in sewage sludges and livestock manures were decreased to 43% and 34%, respectively.
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KEYWORD
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sewage sludge, composting, temperature, C/N ratio, hemicellulose, amino acid
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