ASSESSING THE EFFECTIVENESS OF OZONATION FOR FRESH WATER DISINFECTION
DOI:
https://doi.org/10.11603/1811-2471.2023.v.i4.14189Keywords:
ozone, water disinfection, microbial inactivation, portable ozone generatorAbstract
SUMMARY. The demand for effective and environmentally safe methods of disinfection of fresh water sources is of paramount importance to address the growing problems with waterborne pathogens. A water treatment method that uses ozone to disinfect and purify water has gained popularity due to its potential advantages over traditional disinfection methods.
The aim – to evaluate the effectiveness of ozonation for fresh water disinfection in order to understand its applicability and suitability for different types of water.
Material and Methods. Samples of tap water, spring water and open water were taken, water ozonation was carried out electrolytically using a commercial portable ozonator for 2 and 5 minutes. To increase the duration of the action of ozone already formed in the water, the samples were kept for an additional 5 and 10 minutes. Treated and untreated samples were subjected to microbiological examination with the calculation of the total microbial number. The mineralization of water samples was additionally evaluated.
Results. Demonstrated that ozonation provided significant disinfection potential, effectively reducing the microbial load compared to the control. The effectiveness of inactivation depended on the initial concentration of microorganisms in the water and the duration of ozonation. The tap water was the least contaminated and was completely purified, the spring water contained ~2.7 log CFU/mL, which was inactivated by ozonation for 5 minutes with an additional exposure of 5 minutes. Water from open water bodies contained ~3.8 log CFU/mL, of which only 1.9 log CFU/mL could be neutralized even after ozonation for 5 minutes and an additional exposure of 10 minutes. Mineralization significantly decreased only in spring water from 421 mg/L to 388 mg/L.
Conclusions. Ozonation is an effective method of water disinfection, but its effectiveness can be affected by various factors, including water quality, ozone dosage, and contact time.
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