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Clean vehicles, polluted waters: empirical estimates of water consumption and pollution loads of the carwash industry

Carwash stations use large volumes of water and release harmful chemicals into the environment through their operations. While a significant body of literature has focused on exploring water use in the carwash industry, none has provided comprehensive information on both the pollution loads of the w...

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Autores principales: Monney, Isaac, Donkor, Emmanuel Amponsah, Buamah, Richard
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7226662/
https://www.ncbi.nlm.nih.gov/pubmed/32426547
http://dx.doi.org/10.1016/j.heliyon.2020.e03952
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author Monney, Isaac
Donkor, Emmanuel Amponsah
Buamah, Richard
author_facet Monney, Isaac
Donkor, Emmanuel Amponsah
Buamah, Richard
author_sort Monney, Isaac
collection PubMed
description Carwash stations use large volumes of water and release harmful chemicals into the environment through their operations. While a significant body of literature has focused on exploring water use in the carwash industry, none has provided comprehensive information on both the pollution loads of the wastewater emanating from this industry and water consumption. Understanding how much water is used and the pollution loads of wastewater from this industry is useful to ensure adoption of water conservation measures and design wastewater recycling systems given the dwindling freshwater resources globally. This study estimated the freshwater quantities used to wash different vehicle types and the pollution loads of the resulting wastewater in the Kumasi Metropolis. Seven proxy carwash stations were purposively selected and monitored to estimate the water used to wash six different categories of vehicles. Composite wastewater samples from three carwash stations were analysed for concentrations of different contaminants which were used to compute pollution loads. Using R software, one-way ANOVA with Tukey's (HSD) post-hoc testing and 2-sample t-test at 95% confidence interval were employed to test statistical differences. After an 8-week monitoring campaign involving 3,667 vehicles, the study showed that average water used for each vehicle type were in the order: Motorbike - 97L (95% CI: 90–103L); Salon car - 158L (95% CI: 154–161L); SUV - 197L (95% CI:191–203L); Buses/Coaches - 370L (95%CI:351–381L); Articulated truck 1,139L (95% CI:916–1,363L); Graders/Loaders - 1405L (95% CI:327–2,483L). Overall, the carwash industry in the Metropolis uses about 1000m(3) of freshwater daily and discharges the resulting wastewater into waterways untreated. The wastewater has a low Biodegradability Index (0.3–0.4) and is characterized by a mildly alkali pH (7.6–8.6) with high levels of Sulphates (40.8–69.8 mg/L), COD (990–1413 mg/L), TSS (1260–3417 mg/L) and E. coli (2.3–4.7 × 10(3) CFU/100mL). Pollution loads of BOD and COD were up to 2tons/year and 6tons/year respectively. Stipulated effluent discharge guideline values were mostly exceeded – in some cases by up to 68 times. To avert the unbridled wastage of freshwater, the study recommends enforcement of wastewater recycling for all carwash stations and promulgation of a tax system that rewards stations that recycle wastewater and surchages those wasting freshwater.
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spelling pubmed-72266622020-05-18 Clean vehicles, polluted waters: empirical estimates of water consumption and pollution loads of the carwash industry Monney, Isaac Donkor, Emmanuel Amponsah Buamah, Richard Heliyon Article Carwash stations use large volumes of water and release harmful chemicals into the environment through their operations. While a significant body of literature has focused on exploring water use in the carwash industry, none has provided comprehensive information on both the pollution loads of the wastewater emanating from this industry and water consumption. Understanding how much water is used and the pollution loads of wastewater from this industry is useful to ensure adoption of water conservation measures and design wastewater recycling systems given the dwindling freshwater resources globally. This study estimated the freshwater quantities used to wash different vehicle types and the pollution loads of the resulting wastewater in the Kumasi Metropolis. Seven proxy carwash stations were purposively selected and monitored to estimate the water used to wash six different categories of vehicles. Composite wastewater samples from three carwash stations were analysed for concentrations of different contaminants which were used to compute pollution loads. Using R software, one-way ANOVA with Tukey's (HSD) post-hoc testing and 2-sample t-test at 95% confidence interval were employed to test statistical differences. After an 8-week monitoring campaign involving 3,667 vehicles, the study showed that average water used for each vehicle type were in the order: Motorbike - 97L (95% CI: 90–103L); Salon car - 158L (95% CI: 154–161L); SUV - 197L (95% CI:191–203L); Buses/Coaches - 370L (95%CI:351–381L); Articulated truck 1,139L (95% CI:916–1,363L); Graders/Loaders - 1405L (95% CI:327–2,483L). Overall, the carwash industry in the Metropolis uses about 1000m(3) of freshwater daily and discharges the resulting wastewater into waterways untreated. The wastewater has a low Biodegradability Index (0.3–0.4) and is characterized by a mildly alkali pH (7.6–8.6) with high levels of Sulphates (40.8–69.8 mg/L), COD (990–1413 mg/L), TSS (1260–3417 mg/L) and E. coli (2.3–4.7 × 10(3) CFU/100mL). Pollution loads of BOD and COD were up to 2tons/year and 6tons/year respectively. Stipulated effluent discharge guideline values were mostly exceeded – in some cases by up to 68 times. To avert the unbridled wastage of freshwater, the study recommends enforcement of wastewater recycling for all carwash stations and promulgation of a tax system that rewards stations that recycle wastewater and surchages those wasting freshwater. Elsevier 2020-05-13 /pmc/articles/PMC7226662/ /pubmed/32426547 http://dx.doi.org/10.1016/j.heliyon.2020.e03952 Text en © 2020 The Author(s) http://creativecommons.org/licenses/by-nc-nd/4.0/ This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Article
Monney, Isaac
Donkor, Emmanuel Amponsah
Buamah, Richard
Clean vehicles, polluted waters: empirical estimates of water consumption and pollution loads of the carwash industry
title Clean vehicles, polluted waters: empirical estimates of water consumption and pollution loads of the carwash industry
title_full Clean vehicles, polluted waters: empirical estimates of water consumption and pollution loads of the carwash industry
title_fullStr Clean vehicles, polluted waters: empirical estimates of water consumption and pollution loads of the carwash industry
title_full_unstemmed Clean vehicles, polluted waters: empirical estimates of water consumption and pollution loads of the carwash industry
title_short Clean vehicles, polluted waters: empirical estimates of water consumption and pollution loads of the carwash industry
title_sort clean vehicles, polluted waters: empirical estimates of water consumption and pollution loads of the carwash industry
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7226662/
https://www.ncbi.nlm.nih.gov/pubmed/32426547
http://dx.doi.org/10.1016/j.heliyon.2020.e03952
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