Abstract

The hydrochar was generated by hydrothermal carbonization (HTC) reaction with real food waste (RFW) containing high moisture content. Hydrochar is generated as a solid product via HTC reaction. Hydrochar is a carbon-rich material gaining a great attention due to its unique characteristics. Especially, the surface of hydrochar is enhanced by HTC reaction so that it can be used as an adsorbent as well as a fertilizer in soils. In this study, hydrochar was generated from RFW obtained from dormitory in Seoul via HTC reaction at 230°C for 4 h. The surface enhancement of hydrochar was investigated by FT-IR, SEM images, and surface area measured by iodine and methylene blue number. Water retention capacity and pH of hydrochar were also measured. Then, hydrochar was applied at various mixing ratio of 0% (control), 0.5%, 1.0%, 2.5%, and 5.0% to granitic soil and 0% hydrochar mixed with leaf mold for lettuce growth. The measured parameters for effect of hydrochars included the length, the width, and the numbers of lettuce leaves. During 18 days, change in mass was measured. To characterize the hydrochar, specific surface area, pore volume, water retention capacity, and pH were measured. Surface enhancement of hydrochar was analyzed by FT-IR and FE-SEM. As a result, the specific surface area of hydrochar and the volumes of micro pores increased about 2 times than that of RFW as a biomass. The growth of lettuce was inhibited by hydrochar with the application rates of 1.0%, 2.5%, and 5.0% under the condition investigated.

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