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Article

Resource Utilization of Biogas Waste as Fertilizer in China Needs More Inspections Due to the Risk of Heavy Metals

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Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Institute of Botany, Jiangsu Province and Chinese Academy of Sciences (Nanjing Botanical Garden Memorial Sun Yat-Sen), Nanjing 210014, China
2
Jiangsu Engineering Research Center of Aquatic Plant Resources and Water Environment Remediation, Nanjing 210014, China
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College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China
4
School of Rail Transportation, Soochow University, Suzhou 215131, China
*
Author to whom correspondence should be addressed.
Academic Editor: Luciano Beneduce
Agriculture 2022, 12(1), 72; https://doi.org/10.3390/agriculture12010072
Received: 9 December 2021 / Revised: 4 January 2022 / Accepted: 5 January 2022 / Published: 6 January 2022
(This article belongs to the Section Ecosystem, Environment and Climate Change in Agriculture)
The utilization of livestock waste has attracted increasing attention in recent years. The presence of high levels of heavy metals is a major obstacle to the utilization of biogas as a fertilizer resource. In this study, the heavy metal contents in biogas residue, slurry, and discharged sewage from three representative farms of gooseries, henneries, and dairy farms in the Yangtze River Basin were investigated and assessed. The results demonstrated that heavy metals, including Cd, Mn, As, Cu, Pb, Cr, Zn, etc., could be detected in all biogas residues, with significantly different contents between farm types (p < 0.005). Specifically, biogas residues from the goosery and the dairy farms met “China’s Organic Fertilizer Standards” (COF Standards); however, Cd concentrations in biogas residues from hennery farms exceeded the limits by five times. The concentrations of Cd and Pb in biogas slurries from all of the farms exceeded the limits of the “China Farmland Irrigation Water Quality Standard” (CFIWQ Standard). In particular, the Pb concentrations in biogas slurry from the dairy farms exceeded the limits by 29 times, and the discharged sewage from all three farm types complied with the comprehensive sewage discharge standards in China; however, only that from the goosery farms was suitable for irrigation. Thus, it is recommended to increase the feed selection, biogas engineering, and biological-purification-supporting technology, and to carry out regular sampling inspections of the biogas residue, slurry, and discharged sewage for heavy metals, so that environmental and crop pollution risks can be reduced when they are used as sources of nutrients for eco-friendly agriculture. View Full-Text
Keywords: livestock and poultry breeding; biogas residue and slurry; sewage; heavy metal; safety assessment livestock and poultry breeding; biogas residue and slurry; sewage; heavy metal; safety assessment
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MDPI and ACS Style

Chang, Y.; Zhao, H.; Sun, L.; Cui, J.; Liu, J.; Tang, Q.; Du, F.; Liu, X.; Yao, D. Resource Utilization of Biogas Waste as Fertilizer in China Needs More Inspections Due to the Risk of Heavy Metals. Agriculture 2022, 12, 72. https://doi.org/10.3390/agriculture12010072

AMA Style

Chang Y, Zhao H, Sun L, Cui J, Liu J, Tang Q, Du F, Liu X, Yao D. Resource Utilization of Biogas Waste as Fertilizer in China Needs More Inspections Due to the Risk of Heavy Metals. Agriculture. 2022; 12(1):72. https://doi.org/10.3390/agriculture12010072

Chicago/Turabian Style

Chang, Yajun, Huijun Zhao, Linhe Sun, Jian Cui, Jixiang Liu, Qiang Tang, Fengfeng Du, Xiaojing Liu, and Dongrui Yao. 2022. "Resource Utilization of Biogas Waste as Fertilizer in China Needs More Inspections Due to the Risk of Heavy Metals" Agriculture 12, no. 1: 72. https://doi.org/10.3390/agriculture12010072

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