Results:

This plant will now be able to meet their municipal discharge limits for B.O.D. thanks to the effectiveness of BCP-11.

Figure One:  C.O.D. decline over 7 day period.

Background:

The wastewater is from a solvent recovery plant, which redistills and purifies used solvents.  The wastewater is from a couple of sources such as rainwater washing contaminants from the process equipment and the ground surrounding the equipment.  The other source is from process water contaminated with various chemicals.

The treatment process involved the pH adjustment and aeration of a container filled with contaminated water.  The BCP-11 was added to the tank along with BCP-35 to ensure a complete degradation of low and high molecular weight contaminants.  The initial concentration of C.O.D. was about 15,000.

Discussion:

The tank was left over a seven-day period with C.O.D. readings taken each day.  The pH was adjusted to approximately 7.5 with sulphuric acid.  Foaming was observed at the 3-4 day mark and started to settle out after that.  By day 5 the foaming was greatly reduced.

Refer to Figure One above.  The final C.O.D. figure was less than 700 ppm and equates to a 96% reduction. Theoretically the B.O.D. results would be reduced similarly.