In order to study the effect of bean-processing wastewater in cooperation with lotus leaves hydrothermal carbonization on the characteristics of hydrochar, the bean-processing wastewater and lotus leaves were evenly mixed according to the ratios of their different dry-basis solid mass. The hydrothermal carbonization experiments of the mixture were performed with mass ratio of liquid to total dry-basis solid of 10 at 220 ℃ for 10 h. The physicochemical characteristics of the hydrochar obtained were further analyzed. The results show that compared with under pure water condition, the yields of the yields of hydrochar produced from bean-processing wastewater and lotus leaves decrease decrease, the C and N contents increase, and the O content declines. When the mass ratio of dry matter in bean-processing wastewater to lotus leaves increases from 1 to 5, the yields of hydrochar reduce from 34.05% to 31.00%, the C content rises from 58.78% to 66.74%, the mass fraction of O decreases from 26.15% to 16.23%, and the N content is about 3.60%. It provides favorable conditions for its application as electrode material. However, when the proportion of dry matter in bean-processing wastewater increases, the N content in hydrochar does not increase significantly, and the degree of graphitization reduces. The suitable mass ratio of dry matter in bean-processing wastewater to lotus leavesshould be less than 3.
Key words
biomass /
hydrothermal carbonization /
wastewater /
hydrochar /
lotus leaves
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
References
[1] WU X T, LEI G P, XU Y Q, et al.Facile preparation of functionalized hierarchical porous carbon from bean dregs for high-performance supercapacitors[J]. Journal of materials science materials in electronics, 2020, 31(22): 1-12.
[2] TITIRICI M M, WHITE R J, FALCO C, et al.Black perspectives for a green future: hydrothermal carbons for environment protection and energy storage[J]. Energy & environmental science, 2012, 5: 6796-6822.
[3] WANG T F, ZHAI Y B, ZHU Y, et al.A review of the hydrothermal carbonization of biomass waste for hydrochar formation: process conditions, fundamentals, and physicochemical properties[J]. Renewable and sustainable energy reviews, 2018, 90: 223-247.
[4] LANG Q Q, ZHANG B, LIU Z G, et al.Co-hydrothermal carbonization of corn stalk and swine manure: combustion behavior of hydrochar by thermogravimetric analysis[J]. Bioresource technology, 2019, 271: 76-83.
[5] ZHENG C P, MA X Q, YAO Z L, et al.The properties and combustion behaviors of hydrochars derived from co-hydrothermal carbonization of sewage sludge and food waste[J]. Bioresource technology, 2019, 285: 69-106.
[6] 郭淑青, 董向元, 陈祥, 等. 不同豆腐废水添加量下芦苇秆水热焦燃烧特性研究[J]. 农业机械学报, 2021, 52(3): 325-330.
GUO S Q, DONG X Y, CHEN X, et al.Fuel characteristics of reed stalk hydrochar under different dosages of bean curd wastewater[J]. Transactions of the Chinese Society for Agricultural Machinery, 2021, 52(3): 325-330.
[7] QU S S, WAN J F, DAI C C, et al.Promising as high-performance supercapacitor electrode materials porous carbons derived from biological lotus leaf[J]. Journal of alloys and compounds, 2018, 123: 751-763.
[8] DENG Y F, XIE Y, ZOU K X, et al.Review on recent advances in nitrogen-doped carbons: preparations and applications in supercapacitors[J]. Journal of materials chemistry A, 2016, 4: 1144-1173.
PDF(1712 KB)
