Using oily wastewater emulsified fuel in boiler: energy saving and reduction of air pollutant emissions.
The limited data for using emulsified oil have demonstrated its effectiveness in reducing flue gas pollutant emissions. The presence of a high concentration of toxic organic compounds in industrial wastewaters always presents significant problems. Therefore, this study was undertaken by using wastewater with COD of 9600 mg/L and total petroleum hydrocarbons-gasoline 440 mg/L for making an emulsified oil (wastewater content 20% with 0.1% surfactant) to evaluate the extent of reductions in both criteria pollutants and polycyclic aromatic hydrocarbons. For comparison, two other systems (heavy oil fuel and water-emulsified oil) were also conducted. The wastewater-emulsified oil fuel results in significant reductions in particulate matter (PM), NO(x), SO2, and CO as compared to heavy oil fuel and similar to those from water/oil emulsified fuel; for PM, it is better in wastewater-emulsified oil. The reductions of total PAH flue gas emissions are 38 and 30% for wastewater- and water-emulsified fuel, respectively; they are 63 and 44% for total BaP(eq), respectively. In addition to reducing flue gas pollutant emissions, the results also demonstrate that the use of wastewater-emulsified fuel in boiler operation provides several advantages: (1) safe disposal of industrial wastewater; and (2) energy savings of about 13%. Thus, wastewater/oil-emulsified fuel is highly suitable for use in boilers.
Chen
Chun-Chi
CC
Department of Environmental Engineering and Sustainable Environment Research Center, National Cheng Kung University, Tainan 70101, Taiwan.
Lee
Wen-Jhy
WJ
D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000517:prevention & control*; D002245:Carbon Dioxide / Q000032:analysis; D003246:Conservation of Energy Resources; D007220:Industrial Waste; D009589:Nitrogen Oxides / Q000032:analysis; D052638:Particulate Matter / Q000032:analysis; D010578:Petroleum; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis; D011210:Power Plants; D013458:Sulfur Dioxide / Q000032:analysis; D014865:Waste Disposal, Fluid
D000393:Air Pollutants; D007220:Industrial Waste; D009589:Nitrogen Oxides; D052638:Particulate Matter; D010578:Petroleum; D011084:Polycyclic Aromatic Hydrocarbons; D013458:Sulfur Dioxide; D002245:Carbon Dioxide