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| Meta-analysis on heavy metal content and risk of biogas digestate application as fertilizer on soil and different crops |
| Received:December 12, 2024 |
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| KeyWord:biogas digestate;heavy metals;Meta-analysis;soil;crops;risk evaluation |
| Author Name | Affiliation | E-mail | | AI Ping | College of Engineering, Huazhong Agricultural University, Wuhan 430070, China | | | LI Bolun | College of Engineering, Huazhong Agricultural University, Wuhan 430070, China | | | JIN Keda | College of Engineering, Huazhong Agricultural University, Wuhan 430070, China | | | CAI Wei | Qichun County Agricultural Technology Promotion Center, Huanggang 435300, China | | | NIU Wenjuan | College of Engineering, Huazhong Agricultural University, Wuhan 430070, China | | | RAN Yi | Biogas Institute of Ministry of Agriculture and Rural Affairs, Chengdu 610041, China | | | WAN Xiaochun | Rural Energy and Environment Agency, Ministry of Agriculture and Rural Affairs, Beijing 100125, China | xchunwan1123@126.com |
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| Abstract: |
| In order to reveal the risk of heavy metal accumulation in soil and different crops due to the application of biogas fertilizer, the effects of biogas fertilizer application on heavy metal contents in soil and different crops were comprehensively analyzed based on Metaanalysis method with 1 130 valid data from 65 literatures. The results showed that the application of biogas fertilizer increased the content of five heavy metals（Hg, Pb, Cd, Cr and As）in soil by 19.1%, 2.0%, 11.2%, 12.6% and 59.7%, respectively, and there was a significant difference between the five heavy metal elements affected by biogas fertilizer application（P<0.05）. The proportion of Hg and Cd in the soil with high risk and above after the application of biogas fertilizer was 48.3% and 47.7%, respectively, while Pb, Cr and As were at low risk. Biogas fertilizer application increased the pH of acidic soil, and the content of soil heavy metals Pb and As was positively correlated with soil pH, while the content of soil heavy metals Hg was negatively correlated with soil pH. The application of biogas fertilizer increased content of Pb and Cr in grain by 0.4% and 38.4%, increased content of Pb and Cr in vegetable crops by 10.6% and 44.3%. And there was no obvious accumulation pattern of Cd contents in the two types of crops, and there was no significant difference in the effects of biogas fertilizer application on the Pb, Cd and Cr contents of the two types of crops. The results of human intake risk evaluation showed that the target hazard coefficients（THQ）of vegetable crops were 0.509-0.626 for adults and 0.728-0.894 for children, which were higher than the THQ values of food crops for adults（0.158-0.487）and children（0.215-0.662）, respectively. The average THQ of food and vegetable crops were within the standard value of 1. Therefore, there is no health risk of consuming the two types of crops applied by biogas fertilizer. |
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