87-15: The Growth and Control of Nitrifying Bacteria in a Urea Plant Cooling Drift is being placed on water

is being placed on water recovery and reuse to help sustain our planet’s water supplies

and biological concerns

involves removing additional sedimentation control vanes and cutting holes in the pump wells on the operating units

water conserving

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

87-15: The Growth and Control of Nitrifying Bacteria in a Urea Plant Cooling Drift is being placed on waterA 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