热解时间对污泥炭特性及其重金属生态风险水平的影响  

EFFECT OF PYROLYSIS TIME ON CHARACTERISTICS AND HEAVY METAL ECOLOGICAL RISKS IN BIOCHAR MADE FROM WASTEWATER SLUDGE

作　　者：许思涵 王敏艳[2] 张进 刁韩杰 李彦铭 单胜道 曹玉成[1] XU Si-han;WANG Min-yan;ZHANG Jin;DIAO Han-jie;LI Yan-ming;SHAN Sheng-dao;CAO Yu-cheng(School of Environmental and Resource Sciences,Zhejiang A&F University,Hangzhou 311300,China;Department of Bio-Environmental Sciences,Zhejiang A&F University,Shaoxing 311800,China;School of Environment and Natural Resources,Zhejiang University of Science and Technology,Hangzhou 310023,China;Zhejiang Province Key Laboratory of Recycling and Eco-treatment of Waste Biomass,Hangzhou 310023,China)

机构地区：[1]浙江农林大学环境与资源学院,杭州311300 [2]浙江农林大学生物环境学院,浙江绍兴311800 [3]浙江科技学院环境与资源学院,杭州310023 [4]浙江省废弃生物质循环利用与生态处理技术重点实验室,杭州310023

出　　处：《环境工程》2020年第3期162-167,共6页Environmental Engineering

基　　金：国家自然科学基金(21777148,21906148);浙江省自然科学基金(LQ17B070001);浙江省重大科技专项(2015C02037,2015C03007,2015C03011)。

摘　　要：研究了热解时间(1,2,4 h)对污泥炭理化性质、结构和重金属总量的影响,并对污泥炭中重金属的生态风险进行了评价。结果表明:随着热解时间逐渐延长(1~4 h),污泥炭产率和H/C均有不同程度的下降,而其灰分含量和比表面积都显著增加,污泥炭芳香化程度也明显提高。与原污泥相比,热解后污泥炭中各重金属(Cu、Zn、Pb、Cr、Mn、Ni)风险系数均显著降低。当热解时间为2 h时,污泥炭中除Zn之外,其余5种重金属都呈低风险或无风险状态,该结果可为污泥无害化处理和资源化利用提供了参考。Pyrolysis is one of the promising technologies for wastewater sludge treatment,in which pyrolysis residence time is one of the primary factors affecting the properties of sludge biochar.This experiment studied the effects of different pyrolysis residence time(1 h,2 h and 4 h)on physico-chemical properties,structure and total content of heavy metals in sludge biochar.In addition,the ecological risk of heavy metals in sludge biochar was also assessed.Results showed that with increase of the pyrolysis time(1~4 hours),the yield and H/C ratio of the sludge biochar were reduced to some extent,while the ash content and the specific surface area were increased accordingly,as well as the aromaticity.Compared with the raw sludge,the risk index of heavy metals,i.e.Cu,Zn,Pb,Cr,Mn,Ni in the sludge biochar was lowered significantly(p<0.05).When the pyrolysis residence time was set at 2 h,Cu,Pb,Cr,Mn,Ni,except Zn in the sludge biochar,were of lower risk,or at a risk-free status.The results could provide a theoretical basis for hazard-free treatment and resource reuse for the sludge.

关 键 词：污泥热解 污泥炭 热解时间 重金属 风险评价 

分 类 号：X703[环境科学与工程—环境工程] X820.4