Benzaco Scientific engineers first addressed the bacteria issues in the plant’s million gallon water system. Site surveys showed bacteria levels were 1,000 times higher than the proper control range. Because of the fatty acids produced by the bacteria, they were a major source of the malodors at that level. In addition, certain parts of the system were anaerobic, leading to the generation of hydrogen sulfide gases (H2S). Benzaco Scientific suggested biological control program was effective in reducing aerobic bacteria by 85% and anaerobic bacteria by 99%.

While the number of odor complaints were reduced significantly, occasional outbreaks of odor resulted in continued pressure from the community and the DEP.

Even though biologically induced malodors were in control, other variables were contributing to the odor issues. Volatile fatty acids inherent in the recycled fiber and reaction products caused by de-inking and bleaching.

To remedy the problem, Benzaco Scientific introduced Odor-Armor odor neutralization technology. Applied to odor vapors as an atomized spray using a high-pressure system, Odor-Armor reacts to alter the odor molecules, rendering them odorless and imperceptible.

Spray nozzles were strategically placed to address problematic areas such as the aeration basin, clarifier, pulp dryer exhaust stack and exhaust fans for the roof and windows. Even the interior plant air was neutralized by applying Odor-Armor to the process chests and the “man-coolers” managing the air flow between floors.