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The Mattabassett District operates a 20 mgd Regional Wastewater Treatment Facility located in Cromwell, Connecticut with a 1.55 dry ton/hour biosolids fluidized bed incinerator that runs 24 hours/day, seven days/week. In response to Connecticut Department of Environmental Protection (CTDEP) administrative orders and judgments, The District embarked on an ambitious program to evaluate new and emerging mercury removal technologies to address stricter mercury emissions limits planned by CTDEP for municipal sewage sludge (biosolids) incinerators. These administrative orders and judgments imposed targets of 180 and 150 micrograms per cubic meter (ug/m3): CTDEP's goal is 100 ug/m3.

The District evaluated a number of technologies including: Sodium tetra sulfide injection into theincinerator emissions' air stream, which has been used in several power generation plants with success; the introduction of foul air containing hydrogen sulfide, which is believed to oxidize some of the mercury in the incinerator emissions into a more stable form, enhancing overall removal rates; a static carbon bed; and, the most novel and leading edge technology, a Ultra High Efficiency traveling filter cloth system.

The Carbon Bed and Ultra High Efficiency filter manufacturer's experience were with other industries, and the Ultra High Efficiency filter manufacturer's experience was not even related to power generation or sewage sludge incinerators, let alone as an add on following a wet scrubber system.

This evaluation demonstrated that the Ultra High Efficiency traveling filter cloth system will remove sub-micron particles as well as mercury, and the carbon canister will remove mercury.

This study has value to the industry: Jeffery Holmstead, EPA assistant administrator for air and radiation, has been quoted stating, “Mercury control technology is not available on a commercial scale, so the agency was unable to set a MACT standard.” Scott Segal, director of the Electric Reliability Coordinating Council, has been quoted as stating, “There is no mercury control technology that exists today that can achieve the reduction levels finalized in the Clean Air Mercury rule, let alone the 90 percent reductions advocated by some activists."

Document Type: Research Article


Publication date: January 1, 2006

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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