Search the EPA Research Database

Project title

source, pathways and impacts on the AQUAtic environment - identifying solutions to mitigate MANganese issues

Primary Funding Agency

Environmental Protection Agency

Co-Funding Organisation(s)

n/a

Lead Organisation

National University of Ireland Galway (NUIG)

Lead Applicant

Liam Morrison

Project Abstract

Access to clean, safe, potable water sources is essential for our health and to support a balanced ecosystem. Manganese, a trace element required by humans, animals and plants for healthy functioning, found naturally in the environment in over 100 chemical compounds. Manganese becomes a contaminant of concern when found at elevated concentrations in the environment, particularly, in drinking water supplies at levels in excess of 50 µg/L. Recent investigations by local authorities, the EPA and NFGWS have shown that Mn in drinking water is a potential problem in some northern regions of Ireland. The current parametric value (50 µg/L) enforced under the Drinking Water Directive is a protective value, above which problems with discoloration, staining of clothing, plumbing fixtures can occur and an undesirable taste can develop at concentrations greater than 100 µg/L; and when Mn(II) undergoes oxidation this can result in encrustation problems on plumbing (WHO, 2011). Manganese in raw water sources from counties Cavan and Monaghan frequently exceed (up to 1,000 µg/L in 2020) the maximum allowable concentrations under EU and Irish Law (EU, 1989,2014; parametric value (PV) of 50 µg/L) and limits set by international regulations (WHO, 2020; 400 µg/L). A preliminary assessment of existing data (from Cavan and Monaghan Co. Co.’s) by the AQUA-MAN project team indicates that the mineralogical and hydrogeological conditions may have a significant influence on Mn concentrations in drinking water, with effluent from agricultural practices potentially enhancing this. A multi-disciplinary approach (water chemistry, hydrogeology, geology, civil engineering, earth observation, ecology, data analytics and policy) to developing an understanding of the fate and transport of this substance in our aquatic environment is proposed. The AQUA-MAN project aims to identify the sources, pathways and fate of Mn in the drinking water in Counties Cavan and Monaghan. The catchment characterization task will be fundamental in understanding the potential geogenic and anthropogenic sources of Mn and the interaction between both. The extensive water quality sampling efforts together with the analysis of the historical water quality data will help further our understanding regarding the source of Mn. Based on the result of water quality analysis, a Mn assessment and monitoring plan will be developed. In addition to sampling, Mn speciation will help to understand the pathways and recommend ways to mitigate this crisis and devise source water protection plans. The risk-based approach will identify critical source areas (CSA) relating to Mn; provide an assessment of the potential risks stemming from different CSAs; and recommendations will be provided where possible for the water supplier to adapt monitoring to the main risks and to take the necessary measures to manage the risks identified in the supply chain from the raw water source to treatment facility. In summary, the project helps to ensure our drinking water resources are safe, delivering a healthy environment.

Grant Approved

�349,989.65

Research Hub

Healthy Environment

Research Theme

n/a

Start Date

30/03/2022

Initial Projected Completion Date

29/03/2025