Venna Saikrishna, Sharma Hari Bhakta, Mandal Debabrata, Reddy Hari Prasad, Chowdhury Shamik, Chandra Amreesh, Dubey Brajesh K
Department of Civil Engineering, National Institute of Technology Warangal, India.
Department of Civil Engineering, Indian Institute of Technology Kharagpur, India.
Waste Manag Res. 2022 Oct;40(10):1514-1526. doi: 10.1177/0734242X221081667. Epub 2022 Mar 8.
This study aims to use landfill leachate (LL) as an aqueous medium during hydrothermal carbonisation (HTC) of food waste to produce hydrochar (FWH-LL-C), which could be used as an electrode material in energy storage devices. The structural properties and electrochemical performance of the hydrochar were compared to that obtained using distilled water as a reaction medium (FWH-DW-C). The results showed that there is a difference in Brunauer-Emmett-Teller (BET) surface area of FWH-LL-C (220 m gm) and FWH-DW-C (319 m gm). The electrochemical properties were comparable, with FWH-LL-C having 227 F g specific capacitance at 1 A g current density and FWH-DW-C having 235 F g specific capacitance at 1 A g current density. Furthermore, at a power density of 634 W kg, FWH-DW-C achieved the highest energy density of 14.4 Wh kg. The energy retention capacity of the electrode was 98% which indicate that the material has an excellent energy storage capacity. The findings suggested that LL could be used as an alternative source of aqueous media during the HTC of food waste to produce hydrochar which could be used as an effective electrode material in supercapacitors.
本研究旨在将垃圾渗滤液（LL）用作食物垃圾水热碳化（HTC）过程中的水介质，以生产水炭（FWH-LL-C），其可作为储能装置中的电极材料。将该水炭的结构性质和电化学性能与使用蒸馏水作为反应介质获得的水炭（FWH-DW-C）进行了比较。结果表明，FWH-LL-C（220 m²/g）和FWH-DW-C（319 m²/g）的布鲁诺尔-埃米特-泰勒（BET）表面积存在差异。电化学性质相当，FWH-LL-C在1 A/g电流密度下具有227 F/g的比电容，FWH-DW-C在1 A/g电流密度下具有235 F/g的比电容。此外，在634 W/kg的功率密度下，FWH-DW-C实现了14.4 Wh/kg的最高能量密度。电极的能量保持能力为98%，这表明该材料具有优异的储能能力。研究结果表明，在食物垃圾的水热碳化过程中，LL可作为水介质的替代来源，以生产可作为超级电容器中有效电极材料的水炭。
