87-15: The Growth and Control of Nitrifying Bacteria in a Urea Plant Cooling Drift the chemistry of the cooling

the chemistry of the cooling water does not support the growth of Legionella pneumophila

that all chemicals are the same despite the harassment many customers give them

water conserving

The precise and continuous monitoring of chlorine residual at low levels is essential to the efficient operation of cooling towers

87-15: The Growth and Control of Nitrifying Bacteria in a Urea Plant Cooling Drift the chemistry of the coolingA urea plant cooling water system experienced problems with the growth of nitrifying bacteria which produced nitric acid from ammonia resulting in a sharp drop in the pH of the cooling water was found to drop from 7. 5 to 6. 1 over a period of 34 days. It was demonstrated in the laboratory that bacteria possessing the enzyme urease were present in the cooling water. A number of biocides were screened for their ability to inhibit growth of ammonia