Pyrolytic product characteristics of biosludge from the wastewater treatment plant of a petrochemical industry.
Biosludge was produced from the wastewater treatment plant of a petrochemical industry. The element compositions of pyrolytic residues, CO, CO(2), NOx, SOx, total hydrocarbons and detailed volatile organic compounds of pyrolytic gas, and C, H, N, S content and compositions in biofuel were determined in this study. Generally, 75-80% water content in sludge cakes and about 65-70% weight of water vapor and volatile compounds were volatilized during the drying process. Propene, propane, 1-butene, n-butane, isobutene, toluene and benzene were the major volatile organic compounds (VOCs) of the pyrolytic gas, and the concentrations for most of the top 20 VOC species were greater than 5 ppm. C(5)-C(9) compounds contributed 60% by weight of biofuel; 4-hydroxy-4-methyl-2-pentanone was the highest species, accounting for 28-53% of biofuel at various pyrolytic temperatures. Based on the dried residues, there was 8.5-13% weight in pyrolytic residues, 62-82% weight in liquid products (water and crude oil) and 5.8-30% weight in the gas phase after pyrolytic processing at 500-800 degrees C. Finally, 1.5-2.5 wt% liquid fuel was produced after the distillation process. The pyrolytic residues could be reused, the pyrolytic liquid product could be used as a fuel after distillation, and the pyrolytic gas could be recycled in the pyrolytic process to achieve non-toxic discharge and reduce the cost of sludge disposal.
Lin
Kuo-Hsiung
KH
Department of Environmental Engineering, Fooyin University, Kaohsiung, Taiwan.
Hsu
Hui-Tsung
HT
Ko
Ya-Wen
YW
Shieh
Zhu-Xin
ZX
Chiang
Hung-Lung
HL
D056804:Biofuels; D002244:Carbon / Q000737:chemistry; D005740:Gases; D006838:Hydrocarbons / Q000032:analysis; D007220:Industrial Waste; D012722:Sewage / Q000737:chemistry*; D013696:Temperature; D014131:Trace Elements / Q000032:analysis; D055549:Volatile Organic Compounds; D014865:Waste Disposal, Fluid / Q000379:methods; D014867:Water / Q000737:chemistry; D018508:Water Purification / Q000379:methods*
D056804:Biofuels; D005740:Gases; D006838:Hydrocarbons; D007220:Industrial Waste; D012722:Sewage; D014131:Trace Elements; D055549:Volatile Organic Compounds; D014867:Water; D002244:Carbon