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Tertiary treatment and dual disinfection to improve microbial quality of reclaimed water for potable and non-potable reuse: A case study of facilities in North Carolina. | LitMetric

Tertiary treatment and dual disinfection to improve microbial quality of reclaimed water for potable and non-potable reuse: A case study of facilities in North Carolina.

Sci Total Environ

Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, The University of North Carolina at Chapel Hill, 135 Dauer Drive, CB #7431, Chapel Hill, NC 27599, United States.

Published: July 2018

AI Article Synopsis

  • - Treated wastewater is gaining attention for its use in nonpotable applications like agriculture and industry, but advanced treatment for drinking water isn't always feasible in low-resource areas.
  • - A cost-effective alternative involves a multi-barrier treatment approach approved in North Carolina (NCT2RW) which uses tertiary treatment followed by disinfection methods like UV and chlorination.
  • - A case study shows that NCT2RW systems effectively reduce microbes by high log10 reductions, achieving 6 for bacteria, and 4 for viruses and protozoan parasites, highlighting the treatment's effectiveness.

Article Abstract

Treated wastewater is increasingly of interest for either nonpotable purposes, such as agriculture and industrial use, or as source water for drinking water supplies; however, this type of advanced treatment for water supply is not always possible for many low resource settings. As an alternative, multiple barriers of physical, chemical and biological treatment with lower cost and simpler operation and maintenance have been proposed as more globally applicable. One such water reclamation system for both non-potable and potable reuse, is that approved by the State of North Carolina "for Type 2" reclaimed water (NCT2RW). NC Type 2 potable reuse systems consist of a sequence of tertiary treatment to produce well oxidized reclaimed water that is then then further treated by two steps of disinfection, typically UV radiation and chlorination. In this case study, the log10 microbial reduction performance of NCT2RW producing water reclamation facilities is evaluated. Based on the results presented here, NCT2RW consistently achieved high (6 for bacteria, 4 for virus and 4 for protozoan parasite surrogates) log10 reductions using the NC proposed treatment methods. Additionally, lower but significant log10 reduction performance was also documented for protozoan parasites and human enteric viruses.

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Source
http://dx.doi.org/10.1016/j.scitotenv.2018.02.239DOI Listing

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