豆制品废水同荷叶水热碳化对水热焦特性的影响

EFFECT OF BEAN-PROCESSING WASTEWATER COMBINED WITH LOTUS LEAVES HYDROTHERMAL CARBONIZATION ON HYDROCHAR CHARACTERISTICS

为研究豆制品废水协同荷叶水热碳化对水热焦特性的影响,将豆制品废水与荷叶按两者不同干基固体质量比均匀混合,在200℃、10 h、液体与总干基固体质量比为10的条件下进行水热碳化,分析所获水热焦的理化特性。结果表明,同荷叶单独在纯水中水热碳化所得水热焦相比,豆制品废水同荷叶水热制得的水热焦产率有所下降,C和N质量分数有所增加,O质量分数有所减少。豆制品废水中干物质与荷叶干基质量比从1增至5时,水热焦产率从34.05%下降至31.00%,C质量分数从58.78%增至66.74%,O质量分数从26.15%降至16.23%,而N质量分数均约为3.60%,为其作为电极材料应用提供了有利条件,但豆制品废水中干物质占比增加时,并未明显增加水热焦中N元素质量分数,同时降低了石墨化程度,豆制品废水中干物质与荷叶干基质量比以不超过3为宜。

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 drybasis 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.