Electrostatic precipitator for metal and particulate emission control

Improving air pollution control systems is crucial for incinerators to be a n option for sewage sludge disposal. Combinations of venturi and tray tower scrubbers are the most popular air pollution control system for sewage slu dge incinerators. Recently wet electrostatic precipitators have been instal led downstream of the scrubbing system to ensure the compliance of new regu lations. Performance and stack tests were conducted on sludge incinerators at Somerset Raritan Valley Sewage Authority and New England Treatment Compa ny. Efficiencies in terms of heavy metal and particulate removals are prese nted. This paper also describes sewage sludge incinerators, existing air po llution control systems, design considerations of the wet electrostatic pre cipitator, as well as sampling and analysis methods.