Environment: Emissions Reduction

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Recommendations for Process Optimization Emissions Reduction Air pollution control has become a requirement set forth by the Environmental Protection Agency for every incineration facility. All pollution control equipment must be able to operate in such manner that it control and limit emissions and particulates {nitrogen oxides (NOx), sulfur oxides (SOx) and carbon monoxide (CO)} (“Biosolids Technology Fact Sheet”, 2003). The EPA expects that air pollution control devices will reduce nationwide emissions from sewage sludge incinerators by four pounds per year of mercury, 450 tons per year of acid gases, 58 tons per year of particulate matter, and 1.7 tons per year of cadmium and lead (USEPA Fact Sheet 2011). Emissions and particulates can be controlled through the use of mechanical collectors, wet scrubbers, fabric filters, and electrostatic precipitator. Process control devices are also implemented. For example, NOx formation is often reduced through burner operation with low excess air, staging the combustion process, recirculating flue gas, and using low-NOx burners (“Biosolids Technology Fact Sheet”, 2003). Mechanical Collectors and Scrubbers According to the EPA, mechanical collectors are low efficiency control systems, with a range from 50-95 percent efficiency for particles larger than 10 Fm. Mechanical collectors include settling chambers, which use gravity to induce particle settlement; impingement separators, which cause particles to lose momentum and drop out of the gas; and cyclone separators, in which the incinerator exit gas is forced down a cone of decreasing diameter. Wet scrubbers are commonly used to remove particulate matter and water-soluble air contaminants such as hydrogen chloride, sulfur dioxide, an... ... middle of paper ... ... Emissions form Municipal and Hospital Waste Combustors. Environmental Health Perspectives. 1992, 98, 227-234. Roy, M.; Dutta A.; Corscadden, K.; Havard, P.; Dickie, L. Review of Biosolids Management Options and Co-Incineration of a Biosolid-Derived Fuel. Waste Management. 2011, 31, 2228-2235. Miyake, Y,; Yura, A.; Misaki, H.; Ikeda, Y.; Usui, T.; Iki M.; Shimizu, T. Relationship between Distance of Schools from the Nearest Municipal Waste Incineration Plant and Child Health in Japan. European Journal of Epidemiology. 2005, 20(12), 1023-1030. “Final Standards Of Performance For New Stationary Sources And Emission Guidelines For Existing Sources: Sewage Sludge Incinerators” February 2, 2011 USEPA Fact Sheet “Biosolids Technology Fact Sheet: Use of Incineration for Biosolids Management” Environmental Protection Agency. June 2003. Office of Water EPA 832-F-03-013

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