Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6968280 | Journal of Hazardous Materials | 2018 | 32 Pages |
Abstract
This study investigated the pyrolysis characteristic of textile dyeing sludge (DS) using an auger pyrolyser under microwave irradiation at different pyrolysis temperature. The migration and distribution characteristic of heavy metals and their potential ecological risks were investigated using inductively coupled plasma mass spectrometry (ICP-MS) techniques. Temperature and additives (e.g. Ca-bentonite, kaolin and CaO) significantly affected product distribution and yields. Heavy metals showed different enrichment characteristics during pyrolysis and a great percentage of the heavy metals was retained in the sludge char (SC), depending on different temperatures and additives. CaO had a strong ability for retention of S, Pb and Ni. Ca-bentonite, kaolin and CaO had considerable ability to retain Cr at 650â¯â. Ca-bentonite and CaO had positive effects on Ni retention at 450â¯Â°C and 650â¯Â°C. As was enriched at 450â¯Â°C with addition of Ca-bentonite. Cu and Zn were enriched at 450â¯Â°C and 850â¯Â°C without additives and the corresponding residue ratios (RRs) were 88.68-100%, which indicated good stability of these heavy metals during microwave pyrolysis of DS. The heavy metal contents in SC were lower than those in the national standards (CJ/T 362-2011, China) and these heavy metals showed slight potential ecological risk to the environment.
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Authors
Hedong Zhang, Zuopeng Gao, Yang Liu, Chunmei Ran, Xiao Mao, Qinhao Kang, Wenya Ao, Jie Fu, Jing Li, Guangqing Liu, Jianjun Dai,