热解温度和时间对污泥生物碳理化性质的影响  

Effect of pyrolysis temperature and duration on production and nutrient properties of sludge biochar

作　　者：程国淡[1,2] 黄青[1] 张凯松[1] 

机构地区：[1]中国科学院城市环境与健康重点实验室,中国科学院城市环境研究所,厦门361021 [2]中国科学院研究生院,北京100049

出　　处：《环境工程学报》2012年第11期4209-4214,共6页Chinese Journal of Environmental Engineering

基　　金：科技部国际科技合作项目(2009DFB90120);国家"水体污染控制与治理"科技重大专项(2009ZX07317-003)

摘　　要：污泥热解制备生物碳是一种环境友好的污泥处理处置途径。重点考察了热解温度及时间等因素对生物碳品质的影响。污泥取自厦门某城市污水处理厂脱水污泥(初始含水率为80%),热解实验结果表明,随着热解温度的升高(从300～700℃),热解时间的增加(2～4 h),生物碳产率均下降;低温热解时(300℃),生物碳偏酸性,而高温热解时(700℃),生物碳偏碱性;生物碳N含量随着热解温度的升高、热解时间的增加而降低,而P、K及微量元素随着热解温度的升高,热解时间的增加而增加。DTPA浸提实验结果表明,高温热解能降低污泥生物碳中微量元素的有效性。Conversion of sludge to biochar through pyrolysis is one of the environmental friendly ways to treat wastewater sludge.The aim of this work is to investigate the effect of pyrolysis temperature and duration on production of wastewater sludge biochar and evaluate the properties required for agronomic applications.Wastewater sludge collected from a sewage treatment plant in Xiamen was pyrolysed in laboratory scale reactor.The result showed that by increasing the pyrolysis temperature（over the range from 300℃ to 700℃） or duration（over the range from 2 hours to 4 hours） the yield of biochar decreased.Biochar produced at low temperature was acid while at high temperature it was alkaline.The concentration of nitrogen in biochar was found to decrease whereas P,K and micronutrients increased with the increasing pyrolysis temperature or duration.The result of DTPA extraction showed that the high temperature pyrolysis reduced bioavalability of trace elements.

关 键 词：剩余污泥 生物碳 热解 营养元素 

分 类 号：X705[环境科学与工程—环境工程]