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Effects of Coal Fly Ash as a Bulking Agent under Co-composting with Swine Manure and Saw Dust
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 Title & Authors
Effects of Coal Fly Ash as a Bulking Agent under Co-composting with Swine Manure and Saw Dust
Lee, Chang Hoon; Park, Seong Jin; Kim, Myung Sook; Yun, Sun Kang; Sonn, Yeon Kyu;
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The coal fly ash (CFA) may be utilized as an extender for organic waste composting at the same time fully expected to solve all industrial waste disposal and sawdust tribe. The main objective in this study was to evaluate the effect of CFA addition as a bulking agent for swine manure composting. To determine the suitable addition rate of CFA as a bulking agent, 0, 10, 20 and 30% of saw dust were mixed with 30, 20, 10 and 0% of coal fly ash, respectively. Compost quality for swine manure composting was to evaluate temperature, pH, C/N ratio, and phytotoxicity as germination index. Stability of compost increased with increasing levels of CFA as bulking agent during swine manure composting due to the high alkaline materials including CFA. C to N ratio in treatment added CFA was higher than that of the control without CFA. After finishing composting, germination index of lettuce and cabbage in swine manure compost added 10% of CFA was similar to the control, all the heavy metal contents were far below the stipulated standard for organic farming. These results indicated tahr coal fly ash as bulking agents might be alternative materials to save saw dust and apply industrial products for swine manure composting.
Coal fly ash;Bulking agent;Composting;Phytotoxicity;Swine manure;
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