Dyeing sludge (DS) incineration is a promising strategy to achieve waste reduction and waste-to-energy conversion efficiency; however, the poor-combustion performance and high-emission level of the gaseous sulfur of DS limit its applications. This study attempts to introduce wood sawdust (WS) to improve combustion performance and inhibit the sulfur emission during DS incineration. The combustion characteristics and release behavior of sulfur gas products of DS-WS mixtures were investigated using thermogravimetry and mass spectrometry (TG-MS), as well as the influence of WS on sulfur fate of DS and the in-situ retention mechanism to sulfur were revealed by ash analysis. Results indicated that WS addition restrained the devolatilization of light volatiles and facilitated the degradation of heavy volatiles and fixed carbon. WS addition improved the combustibility, burnout performance and combustion stability of DS. Organic sulfur species occupied most sulfur-containing compounds in DS, the thermal degradation of organic matter was responsible for emitting SO₂, CH₃SH, H₂S, COS. SO₂ contributed > 40% of sulfurous gas emissions. WS addition (30%) significantly reduced the normalized sulfur content from DS, and the in-situ retention ratio to sulfur reached 16.72%. The in-situ retention mechanism to sulfur was explained as potassium iron sulfate and calcium hydrogen sulfate jointly retained the release of sulfur. Moreover, Ca-based sulfate was more stable, indicating that the newly formed mineral contributed to preventing the re-emission of sulfur from incineration residue.

染色污泥（DS）焚烧是实现废物减少和废物能源转换效率的有前途的策略；然而，DS的气态硫燃烧性能差，排放水平高，限制了其应用。本研究试图引入木屑 (WS) 以提高燃烧性能并抑制 DS 焚烧过程中的硫排放。使用热重和质谱 (TG-MS) 研究了 DS-WS 混合物中含硫气体产物的燃烧特性和释放行为，以及 WS 对 DS 和原位硫归宿的影响通过灰分分析揭示了对硫的保留机制。结果表明，添加WS抑制了轻挥发分的脱挥发分，促进了重挥发分和固定碳的降解。添加WS改善了DS的可燃性、燃尽性能和燃烧稳定性。有机硫物质在DS中占据了大部分含硫化合物，有机物的热降解负责排放SO ₂、CH ₃ SH、H ₂ S、COS。SO ₂贡献了> 40%的含硫气体排放。添加WS（30%）显着降低了DS的归一化硫含量，对硫的原位保留率达到16.72%。在原位对硫的保留机制被解释为硫酸铁钾和硫酸氢钙共同保留了硫的释放。此外，钙基硫酸盐更稳定，表明新形成的矿物有助于防止硫从焚烧残渣中重新排放。