A Washington County sewer utility found a way to get rid of some of its most troublesome pollutants: sell them to gardeners. Clean Water Services installed a system at its Durham treatment plant that pulls phosphorus and ammonia from sewage waste and processes them into fertilizer pellets that are then sold to nurseries. The system, which began operating last month, is the first of its kind in the United States, and it’s drawing some big-name attention.
The project cost $2.5 million, including approximately $1 million for construction. Boring-based fabricator Marks Brothers built the stainless steel tanks and Stettler remodeled the existing facility to accommodate the new system. Ostara will market the fertilizer and split the profits with Clean Water Services, which expects to recoup the project cost in five years.
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