Results:

Significant B.O.D. reduction and elimination of strong odours from lagoons.
Table One:  Sampling results for one week time frame on lagoon systems.

Background : 

A Southern Ontario vegetable processor utilizes two separate lagoon systems to handle the process water from the plant.  One lagoon system recycles the water through the plant for a washing operation and then dumps into the lagoon for clean up.  The other is a once through lagoon system that contains significant amounts of vegetable matter, which is then discharged to surface water.

The lagoons were aerated in all areas but due to the organic loading in the water there were significant odours coming from the ponds.  The odours were bad enough to cause complaints from staff working in the area and from the surrounding community. 

Discussion:  

The lagoons were treated with BCL-4000 and BCP-60 to help lower the B.O.D. levels and eliminate the smell.  Refer to Table One above:  The B.O.D. loading was reduced by almost 98% to a level of 10 ppm in one lagoon in about a week.  The other lagoon showed better than 50% reduction in the same time period.

The odours were eliminated within 2 days and remained so for the rest of the treatment period (summer and fall).

BCP-60 was added to the lagoons approximately one week before the June 29 water samples were taken.

Significant B.O.D. reduction was observed in both lagoons.

Secondary benefit was elimination of strong odours from the lagoons.