Abstract
The research studied microbial contamination in household GAC filters with residence time. Initial GAC effluents were collected and stored in different circumstances (glass cup, silver cup and new GAC), Bacterial growth in GAC effluents and stored samples were detected during the 3-day residence time simultaneously. Besides, microbiome diversities in the GAC unit were measured for one month. Three main conclusions were found: (1) the maximum microbial counts were higher in storage water than in GAC filters. (2) The growth rates were faster in filters than those in storage water in a shorter residence time and the microbial risks were apparent initially. (3) The pH level decreased with residence time and the oxidation properties increased due to the desorption of GAC. The research provided useful information for optimizing household purifiers usage.
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