Abstract
A radio-frequency plasma system (RF) was used to investigate the removal of microorganisms from water.Plasma generated by RF radiation can produce active compounds (H•, •OH, H2O2, O3, etc.) that have a highoxidation potential and can kill microorganisms present in water (fecal coliforms and total coliforms). Thefrequency of the plasma system was set to 3.0, 3.3 and 3.7 MHz and applied to river water for 60 minutes. Theresults show that in all runs, the pH of the water produced was in the range from 7.4 to 7.9. The removalefficiencies of fecal coliforms achieved were between 83.75 and 95% and were higher than the removalefficiencies of total coliforms, which were between 82.61 and 93.48%. Meanwhile, the death rate (kD) of fecalcoliforms wasfaster than that of total coliforms. Therefore, the removal of total coliforms is the key to removingmicroorganisms fromwater. RF plasma treatment can be used for treatment of drinking water to decreasemicroorganisms.
Highlights
Industrial, domestic and other activities can have a negative impact on water resources, such as causing a decrease in water quality
A frequency of 3.0 MHz applied to the sample for 60 minutes could eliminate fecal coliforms and total coliforms by 83.75% and 82.61%
At 3.3 MHz the removal efficiency of fecal coliforms and total coliforms increased to 87.5% and 91.3%, respectively
Summary
Industrial, domestic and other activities can have a negative impact on water resources, such as causing a decrease in water quality. Such conditions can cause disruption, damage and danger to living organisms that depend on those water resources. Data from the National Development Planning Agency Indonesia in 2014 indicate that about 65-72% of contaminated wells were polluted by Escherichia coli. The bacteria come from toilets near the wells and even most of the rivers in Indonesia are contaminated by Escherichia coli. In Permenkes (Ministry of Health Regulation) 492 from 2010 about drinking water quality requirements it is determined that in water that will be used as drinking water, the total coliforms and fecal coliforms should be zero. Research about the removal of microorganisms (fecal coliforms and total coliforms) from water is very important
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