Nordevco Associates Ltd.

St. Claude wastewater case study


Courtesy of Nordevco Associates Ltd.

The dairy plant located in St. Claude, Manitoba was facing operational and regulatory pressure due to the significant amounts of BOD it was discharging into the community wastewater system. Levels of BOD discharged from the plant were steadily increasing creating pressures on the Town’s lagoon system, increasing from 450 mg/L in June – November 1990 to 2,512 mg/L in the January – April 1992 period. These increasing levels of BOD were placing a strain on the Town’s primary cell’s aeration system reducing the system’s ability to deal with the BOD load. Nordevco was approached to determine if its BactiDomus® Technology would be able to provide a solution. Specifically, could the BactiDomus® Technology reduce the BOD loading on the lagoon primary cell.

As the total storage capacity of the plant’s wastewater holding system ( a series of wastewater storage pits located both inside the plant and outside on the plant property) represented only 53% of the total daily volume of water used, Nordevco understood that it would have to try and maximize the contact time between the BactiDomus® Technology products (106, 210, 402 and 403) and the effluent being discharged from the facility. That was accomplished by using the Town’s sanitary sewer system as an extended treatment system.

The primary focus of BactiDomus® Technology product applications were the wastewater pits both inside and outside the pit. However, additional applications of BactiDomus® Technology products through manholes along the path the effluent took traveling to the lagoon, allowed for an increased treatment time and greater reduction in BOD.

Applications of the various BactiDomus® Technology products continued at varying degrees of regularity from July 20, 1992 until March 13, 1993. While the majority of the treatment focused on the dairy plant wastewater holding system and the sanitary sewer lines, a direct treatment of the lagoon primary cell took place on August 19, 1992.

It was made clear to Nordevco staff that at a minimum, the sewer lines between the plant and the lagoon had not been cleaned in a number of years – it could not even be confirmed that the lines had ever been cleaned. The application of BactiDomus® Technology products to both the plant effluent and the sewer lines would mobilize the years of existing accumulated organic matter and FOG allowing them to flow through the system to the lagoon primary cell. To moderate this temporary increased flow in organic material a BactiDomus® Technology product was, in August 1992, applied directly to the primary cell to deal with this short-term added BOD/organics load.

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