Optimization of halogen dose for biofilm control

摘要

Two quasi closed recirculating systems (A and B) were operated in parallel in an attempt to optimize the halogen dose and residual required for biofouling control and/or the destruction of an established biofilm. Each system contained a deposit accumulation testing system (DATS~(TM)), from Bridger Scientific (heat exchanger, flow controller, and microprocessor for automated data collection), corrosion coupons, a differential pressure section (4' length), a 10 gallon conical bottom reservoir, and a centrifugal pump. Bromine (system A) and chlorine (system B) were studied under varying conditions (pH 7.6 and 8.6; nitrogen source ammonium/nitrate) with three or four halogen doses being examined for each set of conditions.