State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China.
J Hazard Mater. 2012 Oct 15;235-236:298-306. doi: 10.1016/j.jhazmat.2012.07.060. Epub 2012 Aug 7.
Chemical conditioners are often used to enhance sewage sludge dewaterability through altering sludge properties and flocs structure, both affect odorous compounds emissions not only during sludge conditioning but also in subsequent sludge disposal. This study was to investigate emission characteristics of ammonia (NH(3)), sulfur dioxide (SO(2)), hydrogen sulfide (H(2)S) and carbonyl sulfide (COS) generated from sewage sludge conditioned by three representative conditioners, i.e., organic polymers, iron salts and skeleton builders, F-S (Fenton's reagent and skeleton builders) composite conditioner. The results demonstrate that polyacrylamide (PAM) has an insignificant effect on emission characteristics of nitrogen- and sulfur-containing odorous compounds, because the properties, sulfur and nitrogen speciations are similar in PAM-conditioned sludge and raw sludge (RS). Significant increases of SO(2) and H(2)S emissions in the H(2)SO(4) conditioning process were observed due to the accelerated decomposition of sulfur-containing amino acids in acidic environment. Fenton peroxidation facilitates the formation of COS. CaO can reduce sulfur-containing gases emission via generation of calcium sulfate. However, under strong alkaline conditions, free ammonia or protonated amine in sludge can be easily converted to volatile ammonia, resulting in a significant release of NH(3).
化学调理剂常用于通过改变污泥性质和絮体结构来增强污水污泥的脱水能力，这两者不仅会影响污泥调理过程中，也会影响后续污泥处置过程中恶臭化合物的排放。本研究旨在探究三种代表性调理剂（即有机聚合物、铁盐和骨架剂、F-S[芬顿试剂和骨架剂]复合调理剂）调理后的污水污泥产生的氨（NH(3)）、二氧化硫（SO(2)）、硫化氢（H(2)S）和羰基硫（COS）的排放特征。结果表明，聚丙烯酰胺（PAM）对含氮和含硫恶臭化合物的排放特征影响不大，因为 PAM 调理污泥和原污泥（RS）的性质、硫和氮形态相似。在酸性环境中，由于含硫氨基酸的加速分解，硫酸调理过程中观察到 SO(2)和 H(2)S 排放量的显著增加。芬顿氧化促进了 COS 的形成。CaO 可以通过生成硫酸钙来减少含硫气体的排放。然而，在强碱性条件下，污泥中的游离氨或质子化胺很容易转化为挥发性氨，导致 NH(3)的大量释放。
