Optimization of halogen dose for biofilm control
Conference
·
OSTI ID:395347
- Purdue Univ., West Lafayette, IN (United States)
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{trademark}), from Bridger Scientific (heat exchanger, flow controller, and microprocessor for automated data collection), corrosion coupons, a differential pressure section (4 feet 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. Heat transfer resistance (HTR) and differential pressure were used as indicators to the extent of fouling. Corrosion rates and acute toxicity (Ceriodaphnia dubia) were also examined. Bromine and chlorine, in their combined forms, were both found to be effective for prevention of biofilm formation or removal of established biofilms. Residual bromine concentrations required to achieve effective biofilm control were roughly half of those required for residual chlorine.
- OSTI ID:
- 395347
- Report Number(s):
- CONF-9505206--
- Country of Publication:
- United States
- Language:
- English
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