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Title: Mass transfer of volatile organic compounds from drinking water to indoor air: The role of residential dishwashers

Abstract

Contaminated tap water may be a source of volatile organic compounds (VOCs) in residential indoor air. To better understand the extent and impact of chemical emissions from this source, a two-phase mass balance model was developed based on mass transfer kinetics between each phase. Twenty-nine experiments were completed using a residential dishwasher to determine model parameters. During each experiment, inflow water was spiked with a cocktail of chemical tracers with a wide range of physicochemical properties. In each case, the effects of water temperature, detergent, and dish-loading pattern on chemical stripping efficiencies and mass transfer coefficients were determined. Dishwasher headspace ventilation rates were also measured using an isobutylene tracer gas. Chemical stripping efficiencies for a single cycle ranged from 18% to 55% for acetone, from 96% to 98% for toluene, and from 97% to 98% for ethylbenzene and were consistently 100% for cyclohexane. Experimental results indicate that dishwashers have a relatively low but continuous ventilation rate that results in significant chemical storage within the headspace of the dishwasher. In conjunction with relatively high mass transfer coefficients, low ventilation rates generally lead to emissions that are limited by equilibrium conditions after approximately 1--2 min of dishwasher operation.

Authors:
;  [1];  [2]
  1. Univ. of Texas, Austin, TX (United States). Dept. of Civil Engineering
  2. Environmental Protection Agency, Washington, DC (United States)
Publication Date:
OSTI Identifier:
678066
Resource Type:
Journal Article
Journal Name:
Environmental Science and Technology
Additional Journal Information:
Journal Volume: 33; Journal Issue: 13; Other Information: PBD: 1 Jul 1999
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; INDOOR AIR POLLUTION; DRINKING WATER; MATHEMATICAL MODELS; EMISSION; ACETONE; ALKYLATED AROMATICS; POLLUTION SOURCES

Citation Formats

Howard-Reed, C, Corsi, R L, and Moya, J. Mass transfer of volatile organic compounds from drinking water to indoor air: The role of residential dishwashers. United States: N. p., 1999. Web. doi:10.1021/es981354h.
Howard-Reed, C, Corsi, R L, & Moya, J. Mass transfer of volatile organic compounds from drinking water to indoor air: The role of residential dishwashers. United States. https://doi.org/10.1021/es981354h
Howard-Reed, C, Corsi, R L, and Moya, J. 1999. "Mass transfer of volatile organic compounds from drinking water to indoor air: The role of residential dishwashers". United States. https://doi.org/10.1021/es981354h.
@article{osti_678066,
title = {Mass transfer of volatile organic compounds from drinking water to indoor air: The role of residential dishwashers},
author = {Howard-Reed, C and Corsi, R L and Moya, J},
abstractNote = {Contaminated tap water may be a source of volatile organic compounds (VOCs) in residential indoor air. To better understand the extent and impact of chemical emissions from this source, a two-phase mass balance model was developed based on mass transfer kinetics between each phase. Twenty-nine experiments were completed using a residential dishwasher to determine model parameters. During each experiment, inflow water was spiked with a cocktail of chemical tracers with a wide range of physicochemical properties. In each case, the effects of water temperature, detergent, and dish-loading pattern on chemical stripping efficiencies and mass transfer coefficients were determined. Dishwasher headspace ventilation rates were also measured using an isobutylene tracer gas. Chemical stripping efficiencies for a single cycle ranged from 18% to 55% for acetone, from 96% to 98% for toluene, and from 97% to 98% for ethylbenzene and were consistently 100% for cyclohexane. Experimental results indicate that dishwashers have a relatively low but continuous ventilation rate that results in significant chemical storage within the headspace of the dishwasher. In conjunction with relatively high mass transfer coefficients, low ventilation rates generally lead to emissions that are limited by equilibrium conditions after approximately 1--2 min of dishwasher operation.},
doi = {10.1021/es981354h},
url = {https://www.osti.gov/biblio/678066}, journal = {Environmental Science and Technology},
number = 13,
volume = 33,
place = {United States},
year = {Thu Jul 01 00:00:00 EDT 1999},
month = {Thu Jul 01 00:00:00 EDT 1999}
}