City and County of Broomfield, CO - case study

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Courtesy of AnoxKaldnes AB - a Veolia Water Company

The Overview
The City and County of Broomfield, Colorado, with a population of 48,000 was in need of improved wastewater treatment to meet effluent guidelines for phosphorus, ammonia, nitrates and BOD removal from their wastewater.

During the winter of 2000-2001, AnoxKaldnes conducted a pilot study to prove the effectiveness of the AnoxKaldnes Hybas process. It was selected as the most cost-effective choice for the city and county among four other alternatives.

The Challenge
Broomfield’s existing system consisted of an activated sludge system for BOD removal only. Because of an increase in projected flows from 5 to 8 MGD and the implementation of new effluent guidelines, expansion of the plant was required. The new effluent guidelines restricted the levels of phosphorus (<1 mg/L), ammonia (<2 mg/L), nitrates (<10 mg/L), and BOD (<10mg/L) that could be present in the water.

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