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CW’s Durham treatment plant sludge may just smell like money

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Portland Tribune

By Barbara Sherman

NEW TREATMENT PROCESS RECOVERS NUTRIENTS FROM SEWAGE AND TURNS IT INTO A MARKETABLE ‘GREEN’ FERTILIZER.

TIGARD – The potential marriage of Clean Water Services with Ostara Nutrient Recovery Technologies Inc. is a match made in heaven – or as close as it gets when the topic is sewage sludge.

Sewage treatment plants, including CWS’s Durham Advanced Wastewater Treatment Facility, have an ongoing problem dealing with phosphorus and other nutrients because the treatment process releases nutrients from the sludge that increases operation costs and consumes plant capacity.

What if the nutrients could be removed and turned into a marketable product that would earn the plant money?

Enter Ostara, a Vancouver, B.C., company founded in 2005 to recover resources from wastewater and recycle them into commercial products.

Ostara’s struvite-recovery process recovers pollutants, helps wastewater-treatment plants reduce operating costs and meet environmental regulations while also providing municipalities and utilities with revenue by creating an environmentally safe slow-release fertilizer.

The CWS Durham plant is now in the middle of a six-to-eight-week-long pilot project using the technology and is only the second place in the United States to test the process after a successful trial in Suffolk, Va., at the Hampton Roads Sanitation District’s Nansemond Wastewater Treatment Plant.

F. Phillip Abrary, president of Ostara, recently spent a day at the CWS plant leading tours of the project along with Rob Baur, a CWS operations analyst II.

In a nutshell, raw sewage enters the plant and goes through a primary treatment in which sludge settles to the bottom, a secondary treatment in which bacteria break down organics, and then a tertiary treatment where phosphorus is removed and particles are filtered out, and then the flow is disinfected before discharge into the Tualatin River.

Read the full article at www.portlandtribune.com

PDF download: 

2007-06-27-PortlandTribune

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