An Improved Vermicomposting System Provides More Efficient Wastewater Use of Dairy Farms Using Eisenia fetida

文献类型： 外文期刊

第一作者： Liu, Xue

作者： Liu, Xue;Geng, Bing;Zhu, Changxiong;Li, Lianfang;Liu, Xue;Francis, Frederic

作者机构：

关键词： wastewater; rice straw; cow manure; Eisenia fetida; biological parameters; vermicomposting; waste management; germination; microbial community

期刊名称：AGRONOMY-BASEL （ 影响因子：2.603； ）

ISSN：

年卷期： 2021 年 11 卷 5 期

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收录情况： SCI

摘要： Dairy cattle farming produces large amounts of wastewater and it causes environmental pollution and eutrophication of rivers, but the nutrients in the waste could be recycled. Here, an improved vermicomposting system was applied to dairy farm wastewater, and wastewater with a nitrogen content of 100 mg/L and 200mg/L tested with different combinations of organic substrates such as cow manure and rice straw in rural solid waste. Results showed that earthworms could continuously grow, wastewater (N 100mg/L) mixed with rice straw corresponding to the most significant gained weight for Eisenia fetida earthworms (2.38 to 9.12-fold), and the earthworms' weight was positively correlated with the C/N ratio, organic matter content, and pH. Compared to the initial state, the system significantly changed physicochemical parameters in nutrients, such as the percentages of total nitrogen, phosphorous, and potassium, which were found to increase in vermicomposting while organic matter content, C/N ratio, and cellulose declined as a function of the vermicomposting period, and the final vermicompost was better for the absorption of plants. These results suggest that continuous wastewater addition improved the effective transformation of organic waste to allow valorizing a broad range of organic residues, and avoid the risk of environmental pollution in dairy cattle farming.

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