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Costs Of Air Pollution Abatement Systems For Sewage Sludge Incinerators, Final Report.

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Capital and annual costs were calculated for applying six different air pollution control systems to municipal sewage sludge incinerators that were using multiple-hearth furnaces. The systems involved three principal types of air pollution equipment--wet scrubbers, fabric filters, and electrostatic precipitators--applied to three different plant sizes (plants incinerating 36, 72, and 300 tons of dry sludge per day in one, two, and eight multiple-hearth furnaces, respectively). The six options were:
1) Venturi/tray scrubber with a 40-inch pressure drop.
2) Fabric filter system operating at 500 degree F and equipped with an upstream temperature control.
3) Fabric filter system operating at 500 degree F and equipped with a heat exchanger and a scrubber for SO2 reduction.
4) Electrostatic precipitator (ESP) with upstream limited temperature and humidity control.
5) Same as Option 4 but with an additional downstream wet scrubber for SO2 reduction.
6) ESP with upstream temperature control and an SO2 scrubber.
Technical feasibility studies indicated that all three types of controls could achieve a total particulate removal efficiency of 99 percent. The venturi/tray scrubber option entailed the lowest capital cost, but annual costs were high because of the high pressure drops and increased energy use.

Air pollution equipment; Incinerators; Sewage treatment; Filters; Cost comparison
Reference #:
EPA Office:
Office of Research and Development
Office Suboffice:
Water Engineering Research Laboratory
Office Division:
Wastewater Research Division
EPA Author:
Wall, Howard
Document Type:
Cost Analysis
PEI Associates, Inc., James Montomery Consulting Engineers
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