Abstract
Due to the abundance of organic matter in compost, the addition of compost to soil can promote the adsorption of pesticides. However, few studies have examined the influence of the composting duration on the organic matter (OM) transformation and adsorption capacity of the compost. In this study, a mixture of sewage sludge and straw was composted, and then the physicochemical properties of various OM were studied. Additionally, the sorption capacities of humic acid (HA), humin (HM), humic acid + humin, and fulvic acid (FA) + humic acid + humin extracted from composts of different stages toward pentachlorophenol (PCP) were compared. The sorption data can be well-described by the Freundlich model, and the sorption capacity of PCP on HM is the strongest of all organic components. After 120 days of composting, the sorption abilities of HA and HM increased by 54.76 and 36.73 %, respectively, which corresponds with increases in the aromatization degree, BET specific area, and pore volume and with a decrease in acid functional groups. The sorption ability of HA and HM increased by 54.76 and 36.73 % due to the increase of the aromatization degree. However, the sorption capacity of the compost decreased by 51.2 %, which resulted from a decrease in total organic matter content and from the interaction between organic components in composts. This could be verified by the sequence of the sorption capacity: HM > HM + HA > HM + HA + FA > HA. The contribution of humus to the sorption of PCP onto compost is approximately 41 to 55 %, and it increases with composting time. Therefore, it is possible that other components are present that affect the adsorption of PCP on composts.
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This work was financially supported by grants from the National Natural Science Foundation of China (41,371,447), National Key Technologies Research and Development Program of China (2013BAC16B03), Zhejiang Provincial Science and Technology Project (2013C33025), and Scientific Research Project of the Department of Education of Zhejiang Province (Y201226062).
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Liping, L., Defu, L., Huanyu, C. et al. The change of organic matter in sewage sludge composting and its influence on the adsorption of pentachlorophenol (PCP). Environ Sci Pollut Res 22, 4977–4984 (2015). https://doi.org/10.1007/s11356-014-3756-0
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DOI: https://doi.org/10.1007/s11356-014-3756-0