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首页> 美国卫生研究院文献>Materials >The Preliminary Study of Water-Retention Related Properties of Biochar Produced from Various Feedstock at Different Pyrolysis Temperatures
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The Preliminary Study of Water-Retention Related Properties of Biochar Produced from Various Feedstock at Different Pyrolysis Temperatures

机译：不同热解温度下各种原料制得的生物炭的保水相关特性的初步研究

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摘要

Physicochemical properties of biochar, which are used as a soil amendment material in agricultural fields, are different depending on biomass feedstock and pyrolysis processes. In this study, we evaluated the influence of feedstock type and pyrolysis temperature on the water-retention related properties of biochar. Wood-chips [cedar (CE) and cypress (CY)]; moso bamboo (MB); rice husk (RH); sugarcane bagasse (SB); poultry manure (PM) and agricultural wastewater sludge (WS) were each pyrolysed at 400, 600 and 800 °C with a retention time of two hours. Scanning electron microscopy micrographs (SEM), hydrophobicity indices, pore-size distribution measured by mercury-intrusion porosimetry, water-retention curves (WRCs) and plant-available water capacities (AWCs) of the biochars were measured to evaluate their potentials as soil-amendment materials for improving soils’ water-retention. As the pyrolysis temperature was increased, the hydrophobicity index decreased. On the other hand, pyrolysis temperature did not affect the distribution of micrometre-range pores, which are useful for plant-available water, of biochars. The AWCs of the biochars formed from CE, CY and SB were greater than those produced from other feedstocks, at 600 and 800 °C. Therefore, we can suggest that the biochars derived from wood-chips (CE and CY) and SB have greater potential for enhancing soils’ water-retention.
机译：根据生物质原料和热解过程的不同，用作农业改良土壤材料的生物炭的理化特性也不同。在这项研究中，我们评估了原料类型和热解温度对生物炭保水相关特性的影响。木片[雪松（CE）和柏树（CY）]；毛竹（MB）;稻壳（RH）;甘蔗渣（SB）;家禽粪便（PM）和农业废水污泥（WS）分别在400、600和800°C下热解，保留时间为2小时。测量了生物炭的疏水性指数，通过压汞法测得的疏水性指数，孔径分布，保水曲线（WRC）和植物有效水容量（AWC），以评估其作为土壤生物质的潜力。改善土壤保水的改良材料。随着热解温度的升高，疏水指数降低。另一方面，热解温度不影响生物炭的微孔范围的孔分布，该孔可用于植物可用的水。在600和800°C下，CE，CY和SB形成的生物炭的AWC大于其他原料产生的AWC。因此，我们可以认为源自木片（CE和CY）和SB的生物炭具有增强土壤保水性的更大潜力。

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