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| Effects of Pyrolysis Temperature on Yield and Physicochemical Characteristics of Biochar from Animal Manures |
| Received:May 12, 2015 |
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| KeyWord:temperature;animal manure;biochar;physicochemical characteristics |
| Author Name | Affiliation | E-mail | | WANG Huang-ping | Institute of Soil and Fertilizer, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China | | | ZHANG Qing | Institute of Soil and Fertilizer, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China | | | LI Yu | Institute of Soil and Fertilizer, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China | | | REN Li-hua | Central Laboratory, Fujian Academy of Agricultural Sciences, Fuzhou 350003, China | | | LI Fang-liang | Institute of Soil and Fertilizer, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China | | | LUO Tao | Institute of Soil and Fertilizer, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China | luotaofjfz@188.com | | WENG Bo-qi | Agricultural Ecology Institute, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China | | | WANG Qiu-ying | Institute of Soil and Fertilizer, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China
College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China | |
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| Abstract: |
| Many studies have examined the effects of pyrolysis temperature on yields and physicochemical characteristics of biochars from plant residues with high carbon and low ash content. However, few reports have been focused on biochars from animal manure with high mineral nutrient content. In this work, selected animal manures(chicken manure, solid-liquid separated pig manure, cow dung) were used to investigate the effects of different temperatures(350, 450, 550, 650 ℃ and 750 ℃) on yields and physicochemical properties of biochars produced in a closed low-oxygen reactor using pyrolysis process. As pyrolysis temperature increased, ash content, pH, conductivity, salinity content, and total content of P and K increased, while biochar yields, volatile content, fixed-C yield, total N content decreased gradually. Temperature had significant negative correlation with biochar yield, fixed-C yield and total N content. At higher temperatures, the biochar particles became rougher. The optimum pyrolysis temperature for high biochar yields and low N loss was 450 ℃. At this temperature, the biochar quality was cow dung> pig manure >chicken manure. Utilizing chicken manure biochar needs paying more attention to its salt toxicity. With higher pH and nutrient content, livestock manure biochars could be used in amending acidic soils and for producing organic fertilizers. |
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