Nitrification case study


Courtesy of Cleveland Biotech Ltd.

The Bay View effluent treatment plant is one of the largest wastewater treatment facilities in North West Ohio, USA. The facility is located near the mouth of the Maumee River and provides treatment for an area of about 100 square miles. About 84 square miles of this area is located within Toledo city. The population that it serves is approximately 398,000.

The plant operates on a 24 hour a day, seven days a week schedule treating an average flow of 85 million gallons a day. Various preliminary and secondary treatment processes are operated at the Bay View treatment plant. The secondary activated sludge system is required to achieve nitrification to enable the facility to meet the ammonia discharge consent. Approximately May 1st a main transformer was damaged resulting in a power outage to the aeration basin. The lack of dissolved oxygen caused a loss of the nitrification population.

Process operators tried without success for about ten days to re-establish nitrification using the natural population. They then applied a selected nitrifier population supplied by bacterial product producer. As this proved ineffective they switched to Cleveland Biotech’s Amnite NS500 nitrifying product supplied by the local distributor together with on site technical support and service. As shown by the attached graph an almost immediate improvement in nitrification (ammonia removal) was achieved and maintained.

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