The production of biochar is one of the new methods used in the recycling of organic wastes. The use of biochar may increase carbon storage in the soil for longer periods of time. In this study, carbon and nitrogen contents of different sizes of tomato harvest residue biochar (TB) produced at different temperatures and holding times were determined. TB produced at five different temperatures (300, 400, 500, 600, 700 °C) and three different durations (20, 40, and 80 min) was divided into three different grain size classes (< 0.5, 0.5–2, and 2–4 mm). Total carbon (C) and nitrogen (N) contents of each size class were examined. Production temperature significantly affected N contents of TB (p < 0.05) while changes in the C contents due to temperature were not statistically significant (p > 0.05). On the other hand, effect of TB size on C and N contents was statistically significant (p < 0.05). As TB grain size increases, BET surface area and total pore volume increased, while average pore radius decreased. The larger size of biochar (2–4 mm) demonstrated highly porous and honey-combed structures and contained both micro- and mesopores, which create a high specific surface area. It was suggested that the properties of biochar produced under the same conditions may vary according to their size and different sizes of biochar may be preferred according to the intended use.

中文翻译：

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粒径引起的碳氮浓度变化和番茄收获残余物生物炭的特征

生物炭的生产是用于有机废物回收的新方法之一。生物炭的使用可以增加土壤中碳的储存时间更长。在这项研究中，确定了在不同温度和保温时间下产生的不同大小的番茄收获残余物生物炭（TB）的碳和氮含量。在五种不同的温度（300、400、500、600、700°C）和三种不同的持续时间（20、40和80分钟）下产生的结核病被分为三种不同的粒度等级（<0.5、0.5–2和2） –4毫米）。检查每种尺寸类别的总碳（C）和氮（N）含量。生产温度显着影响TB的N含量（p  <0.05），而温度引起的C含量变化无统计学意义（p > 0.05）。另一方面，TB大小对C和N含量的影响具有统计学意义（p  <0.05）。随着TB晶粒尺寸的增加，BET表面积和总孔体积增加，而平均孔半径减小。较大尺寸的生物炭（2-4毫米）显示出高度多孔的蜂窝状结构，并同时包含微孔和中孔，从而产生了高的比表面积。建议在相同条件下生产的生物炭的性质可以根据其尺寸而变化，并且根据预期用途可以优选不同尺寸的生物炭。