Household survey of installation and treatment efficiency of point-of-use water treatment systems in Hanoi, Vietnam

Since urban water supply is not yet available for every inhabitant in Hanoi City, numerous residents look for alternative sources such as groundwater and rainwater to compensate the supply shortage. However, in parts of Hanoi, it was reported that groundwater is polluted by various contaminants incl...

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Bibliographic Details
Published in:Aqua (London) 2014-01, Vol.63 (2), p.154-161
Main Authors: Do, An Thuan, Kuroda, Keisuke, Hayashi, Takeshi, Nga, Tran ThiViet, Oguma, Kumiko, Takizawa, Satoshi
Format: Article
Language:English
Subjects:
Ammonia
Anion exchange
Anion exchanging
Anions
Arsenic
Contaminants
Efficiency
Garbage collection
Ground-water quality
Groundwater
Groundwater quality
Groundwater treatment
Households
Integration
Microfiltration
Organizations
Proliferation
Rain
Rain water
Removal
Reverse osmosis
Sand
Sand filters
Shortages
Surveying
Water analysis
Water purification
Water quality
Water sampling
Water shortages
Water supplies
Water supply
Water treatment
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Summary:Since urban water supply is not yet available for every inhabitant in Hanoi City, numerous residents look for alternative sources such as groundwater and rainwater to compensate the supply shortage. However, in parts of Hanoi, it was reported that groundwater is polluted by various contaminants including arsenic (As) and ammonia (NH4-N). Therefore, numerous types of point-of-use (POU) water treatment systems have been used in households, but treatment efficiency has not been well documented. Hence, this study aims to investigate the proliferation and efficiency of household treatment systems. One hundred and seventy households from three communes were selected for a survey of questionnaires and face-to-face interviews. Twenty-four household water treatment systems from six communes were monitored for water sample collection and analysis. The results indicate that sand filter (SF), ceramic filter (CF), microfiltration (MF), anion exchange (AX) and reverse osmosis (RO) were popular POU water treatment systems, but removal efficiency varied among different treatment processes. Groundwater quality shows an average As concentration of 71 mu g/L (max. 305 mu g/L) and 81% of these samples had As concentration higher than the World Health Organization guideline value of 10 mu g/L. An integration of SF and RO can guarantee water with As concentration below 10 mu g/L, whereas AX, MF and CF did not remove As at all.
ISSN:0003-7214
1606-9935
1605-3974
DOI:10.2166/aqua.2013.011