Regulated and Emerging Disinfection Byproducts During the Production of High Quality Recycled Water
Type: Scientific Investigation
Year Released: 2015
Total Investment: $335,560 (Cash: $149,966: In-Kind: $185,594)
Principal Investigators: Maria José Farré, The University of Queensland (Australia) and Howard S. Weinberg, University of North Carolina at Chapel Hill (USA)
Wastewater reclamation utilizing secondary effluent is recognized as one of the most effective ways to reduce the demand for limited natural freshwater sources. High quality recycled water takes advantage of reverse osmosis or ultrafiltration membranes to achieve this goal but protecting the membranes from biofouling requires use of disinfectants that react with organic matter in the water to produce DBPs that may compromise the quality of treated water destined to supplement a drinking water supply.
Goals and Objectives
The project will provide utilities with insights into water quality issues associated with use of membranes for advanced water treatment by:
- Evaluating disinfection byproduct (DBP) occurrence in full-scale advanced water treatment plants (AWTPs) and their formation and speciation during the disinfection of secondary effluent,
- Determining the efficiency of DBP removal by reverse osmosis (RO) and nanofiltration (NF) membranes, and
- Predicting DBP removal rates at the bench-, pilot- and full-scale RO processes.
DBP formation kinetics with preformed or inline produced monochloramine as well as free chlorine were studied on secondary effluent grab samples obtained from South East Queensland wastewater treatment plants. A full two level three factor factorial design was then employed to investigate the effect of temperature and pH on DBP formation using the three disinfection strategies at different reaction times but at constant disinfectant dose.