Assessment of Aluminum contents in domestic water in Northern Provinces, period 2020 - 2022
Abstract
In this study, the aluminium content was analyzed and evaluated in 266 samples of clean water from 61 water supply facilities with capacities < 1,000 m3/day across 11 provinces in the northern region during the period of 2020 - 2022. The assessment showed that aluminium was detected in clean water samples with concentrations ranging from 0.01 to 1.42 mg/L. Although the proportion of samples with aluminium levels not meeting the standard decreased from 2020 to 2022, during the period of 2020 - 2022, there were still 23 out of 266 samples with aluminium levels not meeting QCVN 01-1/2018/BYT, accounting for 8.64 %. The cause of this result was identified as water supply facilities inadequately considering the number of aluminium salts used, which needed to be more suitable and timely with the changing quality of the input water, leading to the persistence of aluminium levels in clean water and distribution systems. This research underscores the urgent need for water supply facilities to reevaluate their practices and consider the potential health risks of high aluminium levels in clean water. When evaluating the correlation between aluminum levels and some other parameters of clean water quality, the results showed that turbidity and aluminum had a significantly positive correlation with a correlation coefficient of 0.79. Conversely, the correlation between aluminium and permanganate index, ammonia, and hardness was very low.
