摘要
将添加剂Fe_(2)O_(3)、赤泥、CaO与市政污泥以1∶10(质量比)混合共热解,制备改性污泥炭BC-Fe、BC-RM和BC-Ca。研究添加剂对污泥炭特性及重金属(Pb、Zn、Cu、Cr、Mn)形态分布的影响,采用风险评价编码法(RAC)评价污泥炭的生态风险。结果表明,三种改性污泥炭的比表面积较未改性污泥炭(BC)分别增大58.08%,189.58%和122.99%,孔隙结构得到改善;Fe_(2)O_(3)可显著抑制Zn在热解过程中的逸散;BC-Ca中Zn、Pb、Cr、Mn和Cu处于残渣态(F4)的比例较未改性污泥炭(BC)分别增加11.76%,13.03%,26.96%,5.55%和2.11%,且均为RAC低风险。
The modified sludge derived biochar BC-Fe, BC-RM and BC-Ca was prepared by co-pyrolysis of metal oxide additives(Fe_(2)O_(3),red mud and CaO) and sewage sludge at a mass ratio of 1∶10.The influence of additives on the characteristics of the sludge-derived biochar, as well as the speciation distribution of heavy metals(Pb, Zn, Cu, Cr, Mn) were investigated.The ecological risk of the biochar was assessed based on the risk assessment code(RAC).The results showed that compared with unmodified biochar(BC),the specific surface area of the three modified sludge derived biochar increased by 58.08%,189.58% and 122.99%,respectively, and the microstructure performance of the sludge derived biochar was improved in the meantime.The study also revealed that Fe_(2)O_(3)prevented Zn escaping from sludge derived biochar during pyrolysis process.In addition, compared with BC,the fraction of residual state(F4) of Zn, Pb, Cr, Mn and Cu in BC-Ca increased by 11.76%,13.03%,26.96%,5.55% and 2.11%,respectively.Heavy metals investigated in the BC-Ca were all in a low risk condition according to the RAC risk assessment standard.
作者
田玉玲
王成杰
韩融
周梅
葛强茹
程阳
TIAN Yu-ling;WANG Cheng-jie;HAN Rong;ZHOU Mei;GE Qiang-ru;CHENG Yang(School of Water and Environment,Chang’an University,Xi’an 710054,China;Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region,Ministry of Education,Chang’an University,Xi’an 710054,China)
出处
《应用化工》
CAS
CSCD
北大核心
2023年第1期106-111,共6页
Applied Chemical Industry
基金
国家自然科学基金青年基金资助项目(21407012)
陕西省自然科学基础研究计划(2021JM-154)
中央高校基本科研业务费专项资助项目(300102298201)。
关键词
污泥炭
重金属稳定性
生态风险
热解
sludge-derived biochar
heavy metal stability
ecological risk
pyrolysis
