Title: Rapid and High-Efficiency Composting of Sewage Sludge
Abstract: A great deal of municipal sludge has been producing annually, and its components are very complex. How to stabilize and dispose the sewage sludge harmlessly is becoming more and more enormous challenge. The changes of chemicalparameters, such as temperature, moisture, pH, organic matter, water soluble organic carbon and germination index during the composting process were studied inthe present investigation. The optimal technological conditions for composting were evaluated. We have found that the water content of initial materials, forced ventilation volume and mixing frequency were 60%, 300 L·min-1and 5 min·8 h-1~5 min·12 h-1, respectively. The results indicated that the temperature could reach 55 ℃rapidly and lasted 4 days, suggesting that the conditions were able to fulfil the demand of sterilizing. Furthermore, the water content, water soluble organic carbon (WSOC) and organic matter reduced significantly during the composting process. In addition, the composing products in 14 days were almost mature, and could meet the class A hygienic standard of US EPA. The obtained composting products certainly become better regulator for soil fertility.
Publication Year: 2005
Publication Date: 2005-01-01
Language: en
Type: article
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