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| Passivating effect of biochar on heavy metals(Cu and Zn)during composting of pig manure and mushroom residues |
| Received:July 23, 2018 |
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| KeyWord:pig manure;composting;passivation;heavy metals;biochar |
| Author Name | Affiliation | | WANG Yi-xiang | Agricultural Ecology Institute, FAAS, Fujian Key Laboratory of Agricultural Ecological Process of Red Soil Mountain, Fuzhou 350013, China | | LI Bo | Agricultural Ecology Institute, FAAS, Fujian Key Laboratory of Agricultural Ecological Process of Red Soil Mountain, Fuzhou 350013, China | | YE Jing | Agricultural Ecology Institute, FAAS, Fujian Key Laboratory of Agricultural Ecological Process of Red Soil Mountain, Fuzhou 350013, China | | LIU Cen-wei | Agricultural Ecology Institute, FAAS, Fujian Key Laboratory of Agricultural Ecological Process of Red Soil Mountain, Fuzhou 350013, China | | LIN Yi | Agricultural Ecology Institute, FAAS, Fujian Key Laboratory of Agricultural Ecological Process of Red Soil Mountain, Fuzhou 350013, China |
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| Abstract: |
| With the rapid development of animal husbandry in China, the proportion of large-scale farms is increasing. Simultaneously, animal manure has largely been produced. Reusing animal manure as a resource and reducing its environmental adverse impact, are problems that need to be solved urgently. To explore the influence of biochar on the passivation effect of heavy metals during manure composting process, a series of composting tests were conducted to study the effect of different biochar applications on the status of heavy metals by using static forced-air composting boxes. The results showed that compared with the traditional compost control, the pH values of the composts with different biochar application increased by 0.2 to 0.3 pH units, and that the moisture contents of them increased by 15.6% to 20.0% at the end of the composting. It indicated that the addition of biochar improved the physiochemical characteristics of mixtures, such as the ventilation conditions, pH and the moisture content, and accelerated the composting process. The high-temperature durations of the treatments with 6% and 9% biochar application by weight were significantly higher than that of the treatment without biochar application. After aerobic composting with biochar, the concentrations of exchangeable Cu and Zn in the mixtures of pig manure and mushroom residues decreased by 4.25% to 12.06% and 2.83% to 20.87%, respectively. Moderate rate of biochar application could improve the passivation effect on Cu and Zn. The best estimated passivation effects on Cu and Zn were 18.84% and 11.55%, respectively, with 6% biochar application. These results suggest that the appropriate application of biochar can accelerate the composting process of pig manure and mushroom residues and reduce the effectiveness of Cu and Zn in composts. |
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