Emission characteristics of nitrogen- and sulfur-containing odorous compounds during different sewage sludge chemical conditioning processes.
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).
State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China.
Huan
H
Liu
Guang-Qian
GQ
Luo
Hong-Yun
HY
Hu
Qiang
Q
Zhang
Jia-Kuan
JK
Yang
Hong
H
Yao
D000180:Acrylic Resins / Q000737:chemistry; D000641:Ammonia / Q000032:analysis*; D017610:Calcium Compounds / Q000737:chemistry; D002246:Carbon Disulfide / Q000032:analysis*; D002712:Chlorides / Q000737:chemistry; D003031:Coal; D005290:Ferric Compounds / Q000737:chemistry; D006861:Hydrogen Peroxide / Q000737:chemistry; D006862:Hydrogen Sulfide / Q000032:analysis*; D007220:Industrial Waste; D009812:Odorants / Q000032:analysis*; D010087:Oxides / Q000032:analysis* / Q000737:chemistry; D012722:Sewage; D013457:Sulfur Compounds / Q000032:analysis*; D013464:Sulfuric Acids / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods; D000099166:Polyacrylamides
D000180:Acrylic Resins; D000641:Ammonia; D017610:Calcium Compounds; D002246:Carbon Disulfide; D002712:Chlorides; D003031:Coal; D005290:Ferric Compounds; D006861:Hydrogen Peroxide; D006862:Hydrogen Sulfide; D007220:Industrial Waste; D010087:Oxides; D012722:Sewage; D013457:Sulfur Compounds; D013464:Sulfuric Acids; D000099166:Polyacrylamides; C405951:sulfur monoxide; C016538:lime; C033158:sulfuric acid; C024555:ferric chloride