Grey water is being considered more and more for cooling tower water, but what about untreated grey water with high concentrations of ammonia? We know how to handle the TSS, but what about ammonia in cooling water? Does ammonia do anything to the PVC fill? We had to go over to our wastewater and trickling filter group to pick their brains on this one a bit for this high of ammonia concentration. The PVC fill will handle the ammonia without a problem. Brentwood’s PVC media has been used for many years in wastewater treatment systems. The concern is biological growth and fouling at those levels. They could introduce a secondary biological treatment to remove the ammonia upstream of the tower, otherwise, we would highly recommend the use of a low fouling fill and the introduction of the AccuShield antimicrobial material for the fill.
OF21MA with AccuShield
Ammonia is excellent food for microbial growth, so with this concentration in the water we would highly recommend a vertical or vertical-offset fill in order to keep the water velocities higher in order to reduce fouling, but also, the antimicrobial material of the AccuShield product is designed specifically for these applications where there is a high probability for biological growth. I would consider the VF19Plus in Accushield (or possibly the OF21MA in Accushield) to handle the microbial concern.