Abstract
Water quality monitoring is a fundamental tool in the management of freshwater resources. The purpose of monitoring is to provide meaningful quality data for local action planning and catchment-wide decision making. The assessment of water quality is crucial to guarantee the efficient operation of the Water Treatment Plants (WTPs), promoting health conditions and contributing for a more sustainable urban water cycle. In accordance, the objective of this study was to evaluate key target chemical and microbiological water quality parameters, some of them already monitored within Portuguese/EU legal framework and others still not regulated, but with environmental and human heath relevance. A local monitoring database model, using a 6-year period (from 2014 to 2019) of water quality data, regarding water samples collected on representative sampling locations covering the freshwater abstraction sites, conventional WTPs and distribution network was assessed. This work provides new knowledge regarding occurrence and seasonal behaviour for both microbiological and chemical water quality parameters, essential to understand/manage the water supply system. Additionally, relationships between the target variables were also assessed. Particularly, strong correlations were identified between TOC and THMs formation at distribution network (r = 0.69; p ≤ 0.001); nitrates were the water quality parameter that revealed the best correlation between surface water source and treated water (r = 0.81; p ≤ 0.001), suggesting that treatment yield/performance is dependent on surface water load. The local and continuous monitoring of water systems are crucial to implement new approaches to guarantee the best quality of drinking water throughout the supply system.
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Funding
This work was supported by FCT- Fundação Ciência e Tecnologia and Empresa Portuguesa das Águas Livres, SA (PhD grants PDE/BDE/122649/2016 and PDE/BDE/114582/2016).
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RSC: conceptualization, data curation, formal analysis, investigation, methodology, writing—original draft, writing—review & editing. DS: conceptualization, writing—review & editing. PN: data analysis. MMS: conceptualization, methodology, writing—review & editing. PA: data curation. CN: conceptualization, writing—review & editing. VVC: conceptualization, methodology, writing—review & editing. MJB: conceptualization, writing—review & editing. JER: conceptualization, formal analysis, methodology, writing—original draft, writing—review & editing. RNC: conceptualization, methodology, writing—review & editing.
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Chaves, R.S., Salvador, D., Nogueira, P. et al. Assessment of Water Quality Parameters and their Seasonal Behaviour in a Portuguese Water Supply System: a 6-year Monitoring Study. Environmental Management 69, 111–127 (2022). https://doi.org/10.1007/s00267-021-01572-w
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DOI: https://doi.org/10.1007/s00267-021-01572-w