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In 2001 the Milwaukee Metropolitan Sewerage District celebrated the seventy-fifth anniversary of the continuous production of the heat dried biosolids fertilizer called Milorganite┬«. This biosolids fertilizer is produced at the Jones Island Wastewater Treatment Plant and is sold in bags or bulk to distributors in all 50 States and in Canada. While there is a long-term record of production of this biosolids fertilizer, there have been many challenges over the years, both in production and in marketing. In 1994 a new dewatering and drying facility was put into operation, replacing the old facility, which had served faithfully for nearly 70 years. While the design of this new facility incorporated many improvements, modifications are still being made to address operational problem areas. This paper discusses some of the more recent modifications, as well as other production issues an agency should be aware of before including “drying” in the biosolids processing train.

Seven areas of concern are discussed in this paper: 1. Controlling abrasion and corrosion; 2. Maintaining nutrient content; 3. Controlling particle size; 4. Avoiding combustion during production; 4. Avoiding combustion during storage; 6. Controlling air emissions; 7. Supplying the drying energy. These areas are discussed, both from a design and from an operational perspective, along with remedial measures pursued or being pursued by the Milwaukee Metropolitan Sewerage District.

Document Type: Research Article


Publication date: 2002-01-01

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