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Article

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

1
Agricultural Clean Watershed Research Group, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Science (CAAS), Beijing 100081, China
2
Laboratory of Functional and Evolutionary Entomology, Gembloux Agro-Bio Tech, University of Liege, 5030 Gembloux, Belgium
*
Authors to whom correspondence should be addressed.
Academic Editor: Mirko Cucina
Agronomy 2021, 11(5), 833; https://doi.org/10.3390/agronomy11050833
Received: 11 March 2021 / Revised: 19 April 2021 / Accepted: 19 April 2021 / Published: 23 April 2021
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. View Full-Text
Keywords: wastewater; rice straw; cow manure; Eisenia fetida; biological parameters; vermicomposting; waste management; germination; microbial community wastewater; rice straw; cow manure; Eisenia fetida; biological parameters; vermicomposting; waste management; germination; microbial community
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MDPI and ACS Style

Liu, X.; Geng, B.; Zhu, C.; Li, L.; Francis, F. An Improved Vermicomposting System Provides More Efficient Wastewater Use of Dairy Farms Using Eisenia fetida. Agronomy 2021, 11, 833. https://doi.org/10.3390/agronomy11050833

AMA Style

Liu X, Geng B, Zhu C, Li L, Francis F. An Improved Vermicomposting System Provides More Efficient Wastewater Use of Dairy Farms Using Eisenia fetida. Agronomy. 2021; 11(5):833. https://doi.org/10.3390/agronomy11050833

Chicago/Turabian Style

Liu, Xue, Bing Geng, Changxiong Zhu, Lianfang Li, and Frédéric Francis. 2021. "An Improved Vermicomposting System Provides More Efficient Wastewater Use of Dairy Farms Using Eisenia fetida" Agronomy 11, no. 5: 833. https://doi.org/10.3390/agronomy11050833

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