Trihalomethane Formation Downstream Of Spray Aerators Treating Disinfected Groundwater

Keywords

Bromide; Chlorine; Disinfection; Nozzle; Spray aeration; Total trihalomethane

Abstract

Total trihalomethane (TTHM) formation was evaluated in disinfected groundwater that had been treated using spray aeration. A bench-scale air-stripping test apparatus was operated using two alternative spray nozzle configurations: a bench-scale (BS) spray head and an off-the-shelf (OTS) spray nozzle. Finished chlorinated water samples were collected from two Florida groundwater supplies. The Babson Park water treatment plant (BPWTP) contained bromide at below detection levels of >0.025 mg/L; the Oviedo Mitchell-Hammock water treatment plant (OWTP) contained ~0.17 mg/L bromide. Chlorine residuals were maintained downstream of spray aeration treatment at 1.0 mg/L with no apparent loss from aeration. The BS spray nozzle resulted in TTHM removals of 45.2 ± 3.3% for the BPWTP and 37.7 ± 3.1% for the OWTP. The OTS spray nozzle removed 54.7 ± 3.9% and 48.1 ± 6.6% of TTHMs for BPWTP and OWTP, respectively. Lower percent removals in the OWTP were attributed to bromide and subsequent formation of brominated TTHMs in the supply.

Publication Date

2-1-2016

Publication Title

Journal - American Water Works Association

Volume

108

Issue

2

Number of Pages

E99-E108

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.5942/jawwa.2016.108.0007

Socpus ID

84958231264 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84958231264

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