Microwave-assisted pyrolysis of textile dyeing sludge, and migration and distribution of heavy metals

Journal of Hazardous Materials
Hedong ZhangJianjun Dai

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 650 ℃. Ca-bentonite and CaO had positive effects on Ni retention at 450 °C and 650 °C. As was enriched at 450 °C with addition of Ca-bentonite. Cu and Zn were enriched at 450 °C and 850 °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...Continue Reading

Citations

Nov 21, 2019·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Jincheng LiJie Liu
Jan 4, 2021·Journal of Hazardous Materials·Jiantao LiGuanyi Chen
Dec 7, 2020·Waste Management·Zhiyuan ZhangHongwei Chen
Jul 30, 2021·The Science of the Total Environment·Haiming CaiGang Zhang
Jul 20, 2021·Environmental Science and Pollution Research International·Grzegorz IzydorczykKatarzyna Chojnacka
Aug 24, 2021·The Science of the Total Environment·Weizhu ZhouChengyu Ma
May 24, 2020·Ecotoxicology and Environmental Safety·Huanlong PengWei Liu

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