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| Influence of swine farm biogas slurry fractions on soil cadmium activity |
| Received:May 23, 2024 |
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| KeyWord:cadmium;biogas slurry;soil;components;activity |
| Author Name | Affiliation | E-mail | | LI Shijie | College of Resources and Environmental Sciences, Southwest University, Chongqing 400716, China
China Merchants Ecological and Environmental Protection Technology Co., Ltd., Chongqing 400060, China | | | LIU Xin | College of Resources and Environmental Sciences, Southwest University, Chongqing 400716, China | | | LI Shiqi | College of Resources and Environmental Sciences, Southwest University, Chongqing 400716, China | | | YANG Zhimin | College of Resources and Environmental Sciences, Southwest University, Chongqing 400716, China
Chongqing Engineering Research Center of Rural Cleaner Production, Key Laboratory of Agricultural Soil Pollution Risk Management and Control for Ecological Environment in Chongqing, Chongqing 400716, China | | | CHEN Yucheng | College of Resources and Environmental Sciences, Southwest University, Chongqing 400716, China
Chongqing Engineering Research Center of Rural Cleaner Production, Key Laboratory of Agricultural Soil Pollution Risk Management and Control for Ecological Environment in Chongqing, Chongqing 400716, China | 372505096@qq.com |
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| Abstract: |
| This study aims to investigate the effect of biogas slurry fractions with different molecular weights on soil cadmium activity. Pig biogas slurry was filtered, centrifuged, and concentrated via ultrafiltration, resulting in eight treatment groups：control（CK）, primary biogas slurry addition（T1）, biogas slurry particulate organic matter（POM）addition（T2）, biogas slurry dissolved organic matte（DOM）addition （T3）, >30 kDa biogas slurry addition（T4）, 10–30 kDa biogas slurry addition（T5）, 1–10 kDa biogas slurry addition（T6）, and <1 kDa biogas slurry addition（T7）. The incubation period for each treatment group was 30 d. The effective cadmium content of soil in the treatment group was significantly reduced compared with CK, in which the effective cadmium content reduction rates of T6 and T7 treatments were 39.41% and 31.01% on the 7th day, and 34.91% and 53.33% on the 30th day, respectively, which were significantly higher than those of the other treatments. Our results indicated that biogas slurry with a molecular weight of <10 kDa exhibited a better passivation effect on soil cadmium as well as superior long-term stability. The primary mechanism of action involves altering the physical and chemical properties of soil, which increases the fluorescent components of soil organic matter, aromatic substances, and high-molecular-weight organic matter. This transformation promotes the conversion of cadmium from weakly acidic and reducible states to oxidizable and residual states, thereby reducing the bioeffectiveness of cadmium. |
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