热解温度和时间对生物干化污泥生物炭性质的影响  

Effect of temperature and duration of pyrolysis on properties of bio-dried 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》2013年第3期1133-1138,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：污泥热解制备生物炭是一种很有潜力的污泥资源化处置方式,然而,生物炭产量和品质因污泥原料性质、热解条件(如热解温度、时间)的不同而存在显著差异。以生物干化污泥为主要研究对象,系统考察了热解温度及时间等热解因素对生物炭品质的影响。实验结果表明,随着热解温度的升高(300～700℃),热解时间的增加(2～4 h),生物炭产率均下降。低温热解(300℃)生物炭,偏酸性,而高温热解时(700℃)生物炭,偏碱性。生物炭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浸提结果表明,高温热解明显降低了生物炭中微量元素的生物有效性。Converting sewage sludge to biochar is one of the potential ways for sludge recycling. However, significant differences of the yields and properties of biochar were observed due to the properties of raw materials or pyrolysis conditions. The aim of this study is to systematically investigate the effect of pyrolysis conditions, such as temperature and duration, on the properties of the bio-dried sludge bioehar. The results showed that the yields of biochar decreased with the increasing the temperature and duration. Bioehar produced at 300℃ was acid while it was alkaline at 700℃. The content of nitrogen in biochar was found to decrease whereas P, K and the other mieronutrients increased with the increasing pyrolysis temperature or duration. The result of DTPA extraction showed that the high temperature significantly reduced the bioavalability of trace element.

关 键 词：生物干化污泥 生物炭 热解 资源化 

分 类 号：X705[环境科学与工程—环境工程]