Effects of a new water disinfection technology on water quality

Jachimowski, Artur

doi:10.1051/e3sconf/20184400052

Cited by 1 publication

(2 citation statements)

References 8 publications

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“…However, the studies carried out by Jachimowski show that concentrations of ∑ THM in water from the distribution network supplied from the "Raba" Water Treatment Plant, where chlorine gas had been used, the mean being 20.6 μg•dm -3 . After the chlorination plant upgrade, the concentration of this indicator, with the mean value (23.5 μg•dm -3 ) increased by 14% (Jachimowski 2018). What may cause the concentration of chlorination by-products to increase is the use of UV rays which has a considerable impact on the formation potential of these compounds before chemical disinfection (Choi and Choi 2010, Lyon et al 2012, Weng et al 2012.…”

Section: Discussionmentioning

confidence: 99%

“…The average concentrations of selected water quality parameters and chlorine, sodium chloride and electricity use are presented in Table 2 (Jachimowski 2018). Water quality indicators and the quantities of substances/electricity used are taken directly from the Raba plant, while their environmental impacts are modelled with appropriate ecoinvent 3.0 records.…”

Section: Life Cycle Inventorymentioning

confidence: 99%

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Archives of Environmental Protection

Jachimowski¹,

Nitkiewicz²

2019

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The objective of the paper is to use life cycle assessment to compare environmental impact of different technologies used in the process of water disinfection. Two scenarios are developed for water disinfection life cycle at ZUW Raba water treatment plant: (1) historical, in which gaseous chlorine is used as a disinfectant and (2) actual, in which UV radiation and electrolytically generated sodium hypochlorite are used for that purpose. Primary data is supplemented with ecoinvent 3 database records. Environmental impact is assessed by IMPACT2002+ method and its midpoint and endpoint indicators that are calculated with the use of SimaPro 8.4 software. The focus of the assessment is on selected life cycle phases: disinfection process itself and the water distribution process that follows. The assessment uses the data on fl ows and emissions streams as observed in the Raba plant. As the results of primal analysis show, a change of disinfectant results in quantitative changes in THMs and free chlorine in water supplied to the water supply network. The results of analysis confi rm the higher potential of THMs formation and higher environmental impact of the combined method of UV/NaClO disinfection in distribution phase and in whole life cycle, mainly due to the increase of human toxicity factors. However, during the disinfection phase, gaseous chlorine use is more harmful for environment. But the fi nal conclusion states that water quality indicators are not signifi cant in the context of LCA, while both disinfection and distribution phases are concerned.

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