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Legumier Du Madawaska BioCord™ upgrade

The challenge:

The Legumier du Madawaska is a vegetable processing facility located near Riviere-Verte, New Brunswick. The company has been in operation since 1974 and has grown continuously since then, with three different expansions involving increased processing capacity. The main vegetable processed is potatoes for fresh cut French Fries, but they also process carrots, turnips and cabbages. It employs 8-15 workers year-round, and purchases all of its vegetables from local producers.

The Legumier had recently installed a system of four septic tanks to improve the treatment of the wastewater generated by the vegetable processing. While effective at removing suspended solids from the wastewater stream, an increased level of treatment was required to deal with the dissolved organics and increase the pH to the level required by the New Brunswick Department of the Environment.

The BioCord™ Reactor solution:

After examining several alternatives, the Legumier decided on installing BioCord Reactor technology into their existing four-tank septic system. BioCord Reactor Technology would provide a surface for treatment bacteria to grow, removing the organics from the wastewater treatment. A chemical dosing system was also installed to maintain the pH level.

Bishop Water Technologies prepared the full design of the BioCord Reactor system, including the aeration diffuser system and blower, stainless steel suspension brackets, and BioCord media. The pH adjustment system was designed and calibrated by Bishop Water.

In partnership with Complete Energy Systems of Grand Falls, New Brunswick, installation of the BioCord, aeration and chemical dosing system proceeded quickly, completed in two days. Proper scheduling allowed the Legumier to maintain full production while installation was proceeding.

BioCord in a septic tank design
Process diagram

VEPAS pH adjustment system

After a period of acclimatization, the pH adjustment system was able to increase the pH from an average of 5.9 to 7.2, a level much more suitable for the development of treatment bacteria in the system. Initial concentrations of BOD range from 1300-1600 mg/L, and has been reduced to less than 400mg/L. These results are expected to improve as the amount of treatment bacteria increase on the BioCord.

BioCord installation

Performance curve before and after BioCord installation at Legumier

BioCord™ Reactors - simple, low-energy, lagoon nutrient removal

BioCord Reactors provide a simple, low-energy, fixed-film biological treatment process to dramatically increase the performance of wastewater lagoons and conventional activated sludge systems for ammonia, BOD and TSS removal.

BioCord Reactors can be installed directly into an existing treatment system, which helps to dramatically reduce capital costs by avoiding expansion to the plant footprint or adding side-stream process tanks.

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