以芦苇秆为原料,分别用豆腐废水和造纸黑液作反应溶剂,在250℃、240 min和液固比为10的反应条件下开展水热碳化实验,并与纯水环境相对比。结果表明,2种废水都可替代纯水作为芦苇秆水热碳化反应溶剂;与造纸黑液和纯水相比,豆腐废水环境有利于提高水热焦产率、碳含量、高位热值和能量回收率,但造纸黑液作用下水热焦表现出更好的燃烧行为。2种废水替代纯水作为溶剂时,均无需额外处理且工艺简单,既减少了纯水资源消耗,又可充分回收利用废水中有机物,水热焦均可作燃料使用。

In order to explore the effects of different wastewater conditions on the characteristics of biomass hydrochar,taking reed straw as raw material,tofu wastewater (TW) and papermaking black liquor (PBL) as reaction solvent,respectively,hydrothermal carbonization experiments have been carried out under 250℃ and a liquid-solid ratio of 10 for 240 min.Comparative experiments are carried out in pure water environment.The results show that both TW and PBL can replace pure water as the solvent for the hydrothermal carbonization of reed stalk.Compared with PBL and pure water,TW environment is conducive to improving the yield and carbon content of hydrochar,higher heating value (HHV) and energy recovery.Hydrochar obtained under the action of PBL exhibits better combustion behavior than that under pure water condition.No additional treatment is needed and the process is simple when using TW or PBL as solvent,which can reduce the consumption of pure water,and recycle the organic matter in the wastewater.The produced hydrochar under TW or PBL condition can be used as fuel.

董向元(1974-),男,博士,副教授,研究方向为生物质热化学转化与利用,dongxiangyuan@163.com