水热炭化终温对污泥生物炭产量及特性的影响  

Influence of final hydrothermal carbonization temperatures on the yields and characteristics of sludge biochars

作　　者：王定美[1] 徐荣险[1] 秦冬星[1] 王跃强[1] 周顺桂[1] 

机构地区：[1]广东省生态环境与土壤研究所,广东广州510650

出　　处：《生态环境学报》2012年第10期1775-1780,共6页Ecology and Environmental Sciences

基　　金：广东省中国科学院全面战略合作项目(2011B090300076);佛山市院市合作项目(2011BY100245);2012年广东省低碳发展专项资金项目(2012-010)

摘　　要：以市政污泥为原料,采用水热炭化法制备生物炭,研究水热炭化终温对生物炭产量及特性的影响,着重分析不同水热炭化终温(150~330℃)下生物炭的产率、工业成分、元素组成、重金属质量分数及表面官能团的变化。结果表明:随着水热炭化终温的增大,生物炭的产率从75.8%下降至60.6%,水分、挥发分分别从2.64%与23.62%下降至0.68%与12.57%,灰分从69.59%上升至82.50%,固定碳在3.67%~5.05%波动;N、O、C的质量分数下降,相对污泥分别减小46.4%~64.0%、39.2%~88.0%、24.5%~51.3%,H的则先下降后上升,减小3.3%^-27.6%;OH、C―H和C=C官能团逐渐降解,原子比n((O+N)/C)和n(O/C)下降,n(H/C)上升,芳香性和极性降低,水热炭化进程趋于脱水还原降解反应。生物炭中Zn、Pb、Cu、Cr的质量分数随水热炭化终温的增大而增大,Ni、Cd、As、Hg的则呈现出不一致的变化规律;相对污泥,Zn、Pb、Cu、Cr、Cd的质量分数分别增加14.5%~49.4%、39.1%~82.6%、28.5%~73.4%、7.2%~64.5%、53.8%~88.9%,Hg的减少20.5%~83.1%,Ni和As的则增减不一。Hydrothermal carbonization （HTC） has opened up the field of wet biomass residues for biochar production. The aim of this work was to investigate the influence of HTC final temperature on the yields and characteristics of sludge biochars. It was found that when the HTC final temperature was increased from 150 ℃ to 330 ℃, the yield of biochar decreased from 75.8% to 60.6%, moisture and volatile content decreased from 2.64% and 23.62% to 0.68% and 12.57%, respectively, ash content increased from 69.59% to 82.50%, and fixed-carbon changed between 3.67%-5.05%. As the temperature increased, N, O, C contents dropped 46.4%-64.0%, 39.2%-88.0% and 24.5%-51.3%, respectively. Hydrogen content first dropped and then increased, dropped 3.3%--27.6%. Bonds of O--H, C--H and C=C gradually cleaved. Atomic ratios of （O＋N）/C and O/C decreased, while H/C increased. Aromaticity and polarity decreased. HTC tends to be a dehydration reduction degradation reaction with increasing temperature. Higher contents ofZn, Pb, Cu and Cr were associated with a higher final temperature, while those ofNi, Cd, As and Hg changed differently. Zn, Pb, Cu, Cr and Cd increased 14.5% ~ 49.4%, 39.1% - 82.6%, 28.5% - 73.4%, 7.2% - 64.5% and 53.8% 88.9%, respectively, Hg dropped 20.5 % ~ 83.1%, while Ni and As did not change consistently.

关 键 词：生物炭 污泥 水热炭化终温 

分 类 号：X705[环境科学与工程—环境工程]