Emission characteristics of volatile compounds during sludges drying process.
The emission characteristics of volatile compounds (VCs) during municipal sewage sludge (MSS) and paper mill sludge (PMS) drying process were investigated through experiments conducted on a lab-scale tubular drying furnace and a pilot-scale paddle dryer, respectively. The result indicated that five kinds of VCs, i.e. CO(2), NH(3), C(7)H(16) (n-heptane), volatile fatty acids (VFAs) and CH(4) were emitted during the drying process. It was found that the NH(3) and CO(2) were the primary compound released from the MSS drying process. In the case of the PMS, the VFAs and CO(2) were the main compounds released. The temperature and water content of sludge had great effects on the emission rates of NH(3), C(7)H(16), CO(2) and VFAs. The pH and chemical oxygen demand (COD) of condensate from the paddle dryer were also studied. It showed that pH and COD of condensate from MSS were much higher than that from the PMS, and that the higher COD value of the MSS condensate interrelated to the higher ammonium and sulfur content of it.
Deng
Wen-Yi
WY
Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China.
Yan
Jian-Hua
JH
Li
Xiao-Dong
XD
Wang
Fei
F
Zhu
Xiao-Wan
XW
Lu
Sheng-Yong
SY
Cen
Ke-Fa
KF
D000395:Air Pollutants, Occupational / Q000032:analysis*; D000641:Ammonia / Q000032:analysis; D002244:Carbon / Q000032:analysis; D002245:Carbon Dioxide / Q000032:analysis; D060729:Coal Ash; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste / Q000032:analysis*; D007221:Industry; D010209:Paper; D052638:Particulate Matter / Q000032:analysis; D010865:Pilot Projects; D012722:Sewage / Q000032:analysis*; D013055:Spectrophotometry, Infrared; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D014865:Waste Disposal, Fluid; D014877:Water Pollution, Chemical / Q000517:prevention & control*
D000395:Air Pollutants, Occupational; D060729:Coal Ash; D007220:Industrial Waste; D052638:Particulate Matter; D012722:Sewage; D002245:Carbon Dioxide; D002244:Carbon; D000641:Ammonia