Study on the effect of biomass on sulfur release behavior from dyeing sludge incineration: Focusing on in-situ sulfur fixation mechanism based on model compounds

Qinyuan Zhang; Yuchi Chen; Yongjie Xue; Si Chen; Jingxin Liu; Meng Mei; Jinping Li; Lu Ren; Teng Wang

doi:10.1016/j.scitotenv.2023.162544

Study on the effect of biomass on sulfur release behavior from dyeing sludge incineration: Focusing on in-situ sulfur fixation mechanism based on model compounds

Sci Total Environ. 2023 Jun 1:875:162544. doi: 10.1016/j.scitotenv.2023.162544. Epub 2023 Mar 4.

Authors

Qinyuan Zhang¹, Yuchi Chen², Yongjie Xue³, Si Chen⁴, Jingxin Liu⁴, Meng Mei⁴, Jinping Li⁴, Lu Ren⁵, Teng Wang⁶

Affiliations

¹ School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China.
² Center for Water and Ecology School of Environment, Tsinghua University, 100084 Beijing, China.
³ State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China.
⁴ School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China; Engineering Research Centre for Clean Production of Textile Dyeing and Printing, Ministry of Education, Wuhan Textile University, Wuhan 430073, China.
⁵ School of Civil Engineering, Suzhou University of Science and Technology, 215009 Suzhou, China.
⁶ School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China; Engineering Research Centre for Clean Production of Textile Dyeing and Printing, Ministry of Education, Wuhan Textile University, Wuhan 430073, China. Electronic address: 2018001@wtu.edu.cn.

PMID: 36871733
DOI: 10.1016/j.scitotenv.2023.162544

Abstract

Although incineration is a recommended disposal strategy for dyeing sludge (DS), sulfurous gases problem is severe. Wood sawdust (WS) and rice husk (RH) are eco-friendly and CO₂-neutral additives to relieve sulfur emission from DS incineration. However, the interaction between organic sulfur and biomass is uninterpreted. This study explores the effect of WS and RH on the combustion behavior and sulfur evolution from organic sulfur model compound combustion via thermogravimetry (TG) with mass spectrometry (MS). Results indicated that the sulfone and mercaptan combustion activities in DS were more drastic than in other forms. WS and RH additives generally deteriorated the combustibility and burnout performance of model compounds. The combustion of mercaptan and sulfone in DS contributed to most gaseous sulfur pollutants, where CH₃SH and SO₂ were the predominant forms. WS and RH minimized the sulfur release from mercaptan and sulfone incineration, whose in-situ retention ratios reached 20.14 % and 40.57 %. The retention mechanism to sulfur could be divided into: (1) Diffusion stage: the closed structure of biomass residue restrained sulfurous gases from escaping. (2) Chemical reaction stage: multiple sulfation occurred and inhibited sulfur release. Ca/K sulfate and compound sulfates were predisposed and thermostable sulfur-fixing products for the mercaptan-WS and sulfone-RH co-combustion systems.

Keywords: Biomass; Co-combustion; Dyeing sludge; In-situ desulfurization; Sulfur model compounds.