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首页> 外文期刊>American journal of applied sciences >Biochar Types from Latrine Waste and Sewage Sludge Differ in Physico-Chemical Properties and Cadmium Adsorption
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Biochar Types from Latrine Waste and Sewage Sludge Differ in Physico-Chemical Properties and Cadmium Adsorption

机译：厕所废物和污水污泥中生物炭类型的理化性质和镉吸附差异

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Pyrolysis of latrine fecal waste could produce valuable products for minimizing environmental contamination with heavy metals. The objective of this study was to determine yields, characteristics and cadmium (Cd) sorption of biochar from latrine fecal waste and sewage sludge, as affected by pyrolysis temperature. Slow pyrolysis at 350, 550 and 650°C, was used to produce the biochar. In addition to proximate and ultimate analysis, surface area, porosity and functional groups were analyzed. A batch sorption study was conducted to determine the cadmium sorption capacity of the biochar. Biochar from latrine waste had higher yield, ash content, surface area and pore volume and lower total and fixed carbon (C) and volatile matter than from sewage sludge. Yield, volatile matter, total C, nitrogen (N) and hydrogen (H) decreased with pyrolysis temperature, while ash content, surface area and porosity increased. Surface functional groups of the biochar also varied with feedstock and pyrolysis temperature. The Cd sorption capacities were higher for biochar from latrine waste than from sewage sludge. The findings indicated that characteristics of biochar from latrine waste differ from that of sewage sludge origin and has greater potential as an adsorbent for removal of Cd from wastewater.
机译：厕所粪便废物的热解可产生有价值的产品，以减少对重金属的环境污染。这项研究的目的是确定受热解温度影响的厕所粪便废物和污水污泥中生物炭的产量，特性和对镉的吸附。在350、550和650°C下缓慢热解用于生产生物炭。除了进行最终分析外，还对表面积，孔隙率和官能团进行了分析。进行了批量吸附研究，以确定生物炭对镉的吸附能力。与污水污泥相比，厕所垃圾产生的生物炭具有更高的收率，灰分，表面积和孔体积，总碳和固定碳（C）和挥发性物质更低。产率，挥发性物质，总碳，氮（N）和氢（H）随着热解温度的降低而降低，而灰分，表面积和孔隙率则升高。生物炭的表面官能团也随原料和热解温度而变化。厕所废水中的生物碳对镉的吸附能力要高于污水污泥中的Cd吸附能力。研究结果表明，厕所废水中的生物炭特性与污水污泥来源不同，具有更大的潜力，可以作为吸附剂从废水中去除Cd。

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