稻草
烧焦
污水污泥
热解
化学
氮气
生物固体
环境化学
碳氮比
农学
制浆造纸工业
污水处理
环境科学
环境工程
有机化学
无机化学
生物
工程类
作者
Yingwen Zhang,Chunbao Zhou,Zeyu Deng,Xueguang Li,Yang Liu,Junshen Qu,Xiangtong Li,Long Wang,Jianjun Dai,Jie Fu,Changfa Zhang,Mengyan Yu,Hejie Yu
标识
DOI:10.1016/j.scitotenv.2021.152303
摘要
This study explored pyrolysis characteristics, nitrogen transformation and migration of heavy metals during microwave-assisted pyrolysis of municipal sewage sludge in a continuously operated auger pyrolyser at different temperatures and corn straw ratios. The results showed higher temperatures and more corn straw resulted in more gas yield (e.g., CO2, CO, CH4 and H2) and less char yield. 5 wt% corn straw addition at 750 °C achieved high-quality bio-oil with less O-containing compounds, which was more favorable for upgrading to transportation fuels. Sludge chars prepared at higher corn straw ratios had lower ratios of H/C and N/C, and higher carbon content. Nitrogen transformation pathways and mechanisms were investigated. The residual ratio of heavy metals (except Cd) in sludge char was 67.74-100%. However, the residual ratio of Cd decreased significantly to 6.46% at 750 °C. Concentrations of all heavy metals in sludge char conformed to national standard (CJ/T 362-2011, China), and the potential ecological risk was slight. Sludge chars prepared in the presence of corn straw had lower ecological risk and higher retention capacity of heavy metals (e.g., Pb, Cr, Mn, Cu, Zn, and Ni) compared with pyrolysis of sewage sludge.
科研通智能强力驱动
Strongly Powered by AbleSci AI