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| Differential Reduction of Different Components of Domestic Organic Wastes During Composting Process |
| Received:July 14, 2014 |
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| KeyWord:composting;elementary substance;reduction mechanism;redundancy analysis |
| Author Name | Affiliation | E-mail | | XIA Yun | College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, China
Institute of Environment, Resource, Soil & Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China | | | LIN Hui | Institute of Environment, Resource, Soil & Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China | | | WANG Qiang | Institute of Environment, Resource, Soil & Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China | | | MA Jun-wei | Institute of Environment, Resource, Soil & Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China | | | YE Jing | Institute of Environment, Resource, Soil & Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China | | | FU Jian-rong | Institute of Environment, Resource, Soil & Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China | fujr@mail.hz.zj.cn |
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| Abstract: |
| Kitchen wastes and straw represent major percentages in domestic wastes generated in the rural areas. A co-composting experiment of kitchen wastes and rice straw was performed under different conditions to investigate reduction behaviors of different components during composting and relationships between main composting factors and material consumption. The results indicated that the force aeration treatment without any exogenous inocula(T2) had the maximum reduction in the total fresh substance, followed by the force aeration treatment with one type of exogenous microbial inocula(T3), the treatment without any aeration or exogenous inocula(T1), and the force aeration treatment with two types of exogenous inocula(T4). For the force aeration treatments, the stage from 7 d to 13 d had the highest reduction of the fresh wastes throughout the composting. The decrease in the total weight of the fresh substances was attributed to the water loss in all treatments, but different treatments had different preferred ways of water removal. The addition of exogenous microbial inocula did reduce the leachates and increase the percentages of evaporated water. The consumption of the chemical elements of dry substances varied among different treatments. Both carbon loss/dry substance loss ratios and hydrogen loss/dry substance loss ratios were in order of T4>T3>T2>T1; the oxygen loss/dry substance loss ratios exhibited the opposite order among the treatments. In addition, the carbon consumption in all treatments mainly happened at the stage of 0~13 d, which accounted for more than 60% of the total carbon consumption. The RDA analysis indicated that temperature and bacteria had the most significant influences on the reduction behaviors of materials. The composting temperature associated highly with the reduction of the total fresh substance and water loss, while the population of bacteria, actinomycetes and fungi had the strongest relationship with the dry matter loss, the hydrogen element loss and the oxygen element loss, respectively. These results can provide some theoretical guidance for leachate discharge, element loss control and process improvement in the composting process. |
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