Selection of a Solids Management Plan to Meet a Sewerage District's Vision of Becoming a Leader in Sustainability
Abstract:The Green Bay Metropolitan Sewerage District (GBMSD), established in 1931, is a public utility that reclaims 38 million gallons of wastewater per day at two treatment facilities in Green Bay and De Pere, Wisconsin. Its serves more than 219,000 people, and its service area covers 285 square miles. GBMSD's mission is to promote public health and welfare through the collection, treatment, and reclamation of wastewater, while assessing stable, competitive rates. In conjunction with others, the organization encourages pollution prevention and supports programs to help ensure that wastewater is returned clean to the environment. GBMSD conducts its business using a sustainable approach within the social, environmental, and economical values of its customers and stakeholders.
In 2008, GBMSD began to develop a Solids Management Plan to deal with its aging solids handling facilities and also the solids loadings from the recently acquired De Pere Facility. The solids processing system consists of belt press dewatering followed by multiple hearth incineration. The solids handling system is located at the Green Bay Facility. Solids from the De Pere Facility are transferred by pipeline to the Green Bay Facility for processing. The solids system, constructed in the 1970s, is reaching the end of its useful life. The multiple hearth incineration process is now deemed an outdated technology. Current incineration technology uses fluidized beds, which consume less fuel and produce lower air emissions.
The solids management planning effort was undertaken to develop a long-term plan for handling, processing, and disposing of solids. The plan included a comprehensive evaluation of numerous solids management technologies and approaches. This paper describes the process used to develop the plan, the alternatives that were considered, the alternatives evaluation process, and the preferred solids management alternative.
Keywords: Monte Carlo uncertainty analysis; Solids Management Plan; composting; digestion; drying; energy balance; greenhouse gas emissions; incineration; multi-attribute utility analysis; project goals; stakeholder involvement; strategic plan
Document Type: Research Article
Publication date: January 1, 2011
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