Simplified process to determine rate constants for sunlight-mediated removal of trace organic and microbial contaminants in unit process open-water treatment wetlands

Andrea I. Silverman, David L. Sedlak, Kara L. Nelson

Research output: Contribution to journalArticle

Abstract

Unit process, open-water (UPOW) treatment wetlands are a unique type of constructed wetlands that are designed to promote photo- A nd microbiologically mediated natural water treatment processes. A mechanistic understanding of the removal processes for nitrate, trace organic contaminants (TrOCs), and microbial contaminants in UPOW wetlands has been established, and equations have been previously developed to describe removal kinetics. However, the numerical models developed to predict photodegradation rate constants for the removal of TrOC and microbial contaminants involve too many steps to facilitate a practical design approach. In this article, we present a method for predicting rates of phototransformation of representative TrOCs (atenolol, propranolol, sulfamethoxazole, and carbamazepine) and inactivation of microbial indicator organisms (Escherichia coli and MS2) that allows a user to readily design UPOW wetlands to meet different performance goals. Photodegradation rate constants were determined for a range of conditions that influence treatment efficacy (i.e., time of year, pH, latitude, and dissolved organic carbon concentration), and are presented in a series of figures. We illustrate the use of these figures for UPOW wetland design with a representative example of the design process. A spreadsheet containing sample calculations is included in the Supplementary Data.

Original languageEnglish (US)
Pages (from-to)43-59
Number of pages17
JournalEnvironmental Engineering Science
Volume36
Issue number1
DOIs
StatePublished - Jan 2019

Keywords

  • constructed wetland
  • maturation pond
  • photolysis model
  • sunlight disinfection
  • trace organic contaminants

ASJC Scopus subject areas

  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution

Fingerprint Dive into the research topics of 'Simplified process to determine rate constants for sunlight-mediated removal of trace organic and microbial contaminants in unit process open-water treatment wetlands'. Together they form a unique fingerprint.

  • Cite this