SIMULATING CHLORAMINE DISSIPATION IN STORMWATER NETWORKS: A DECISION SUPPORT FRAMEWORK FOR POLLUTANT HAZARD ASSESSMENT

• Author / Creator

  Mohamed Gaafar

• Concerns about total residual chlorine effects on the aquatic
  environment have led to a lowering of allowable effluent discharge
  concentrations. Many municipalities use monochloramine as a water disinfectant, which makes its way into drainage systems through outdoor and industrial water uses, and ultimately into surface waters. Monochloramine is known to dissipate with variable temporal and spatial decay coefficients; however, no existing stormwater models simulate these aspects. Thus, this study describes a novel Variable Decay Coefficient
  Simulator (VDCS) that predicts levels of degradable substances in sewer systems. The importance of spatially- and temporally-varying monochloramine decay coefficients on pollutant concentrations was assessed through three scenarios using, (1) a constant decay coefficient,
  (2) spatially-varying decay coefficients per land-use; and (3) spatially- and temporally-varying decay coefficients. At the system outfall, the spatially- and temporally-varying decay coefficients generated 67% and 100% higher concentrations, respectively, than the constant decay coefficient. These differences have important implications for the modeling of degradable pollutants in stormwater systems, and for the
  application of environmental regulations.

• Subjects / Keywords

  • Water resources engineering

• Graduation date

  Fall 2019

• Type of Item

  Thesis

• Degree

  Doctor of Philosophy

• DOI

  https://doi.org/10.7939/r3-b2k0-m786

• License

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