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Demonstration of the Enhanced Disinfection of E. coli Water Contamination by Associated Solar Irradiation with Potassium Persulfate.

Ghanizadeh G, Naseri Ara A, Esmaili D, Masoumbeigi H - Iran. J. Public Health (2015)

Bottom Line: Tremendous amount of researches have investigated the issue of water photodisnfection.The highest value of UVA solar irradiation measured at 13.30 p.m was 5510 μW/Cm(2).For bacterial density of 1000 cell/ml, increasing KPS dosage up to 0.7 mMol/l had no improved effect; however, beyond this dosage the disinfection time decreased to 1 h.

View Article: PubMed Central - PubMed

Affiliation: Health Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran.

ABSTRACT

Background: Tremendous amount of researches have investigated the issue of water photodisnfection. The aim of this research is to illustrate the influences of bacterial density, turbidity, exposure time and potassium persulfate (KPS) dosage on the efficacy of associated solar disinfection (SODIS) with KPS for E. coli (ATCC: 25922) eradication as an efficient and inexpensive process.

Methods: Desired bacterial density and turbidity was achieved by spiking of 0.5 Mc Farland (1.5×10(8) cell/ml) and sterile soil slurry in 1 liter of the commercially bottled water.

Results: The highest value of UVA solar irradiation measured at 13.30 p.m was 5510 μW/Cm(2). Increase of bacterial density from 1000 to 1500 cell/ml led to an increase in disinfection lapse time, except in 2 mMol/l KPS. Spiking of 0.1 mMol/l of KPS was not effective; however, increase of KPS dosage from 0.1 mMol/l to 0.7, 1.5 and 2 mMol/l led to the enhancement of disinfection time from 4 h to 3 h and 1 h, respectively. For bacterial density of 1000 cell/ml, increasing KPS dosage up to 0.7 mMol/l had no improved effect; however, beyond this dosage the disinfection time decreased to 1 h. Without KPS and up to 150 NTU within 4 h exposure time, E. coli disinfection was completed. In 2 mMol/l KPS and 1000 and 1500 cell/ml, the 2 h contact time was sufficient up to 150 and 100 NTU, respectively; moreover, complete disinfection was not achieved at higher turbidity.

Conclusion: Association of KPS with SODIS can lead to decreasing of water disinfection time.

No MeSH data available.


Related in: MedlinePlus

Graphic presentation of UVA-B irradiation registered during the experiments
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Figure 3: Graphic presentation of UVA-B irradiation registered during the experiments

Mentions: Figure 3 illustrates the variation of UV fluency rate for the non-cloudy days, corresponding to a calendar date from 15 of July to 15 of august, 2012. The results revealed that the intensity of UV irradiation increased from 7.30 a.m. to 13.30 p.m.; with the highest intensity recorded on 13.30 p.m. as 5265 μW/Cm2, and later the fluency of UV rate decreased until 16 p.m. as 3650 μW/Cm2, corresponding to the end point of the experiments. This finding shows that Tehran has an appropriate status for use of SODIS process associated with the technique of KPS for water disinfection and the enhanced active radical formation procedures by solar irradiation which can be applied as innovative techniques for the safe water preservation. As shown in Fig. 3, based on Tehran local time and UV fluency and the calendar time rate from July to august, it can be concluded that the local time of 10 a.m. to 16 p.m. (6 h exposure) is the best time for application of SODIS with UV irradiation for water disinfection. Based on these results, it can be claimed that Iran’s geographical latitude (25° 3′ to 35° 47′ N and 44° 5′ to 63° 18′ S) provided the appropriate status for development and application of SODIS technique as a simple method for safe water provision, especially in remote and low income areas.


Demonstration of the Enhanced Disinfection of E. coli Water Contamination by Associated Solar Irradiation with Potassium Persulfate.

Ghanizadeh G, Naseri Ara A, Esmaili D, Masoumbeigi H - Iran. J. Public Health (2015)

Graphic presentation of UVA-B irradiation registered during the experiments
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4644583&req=5

Figure 3: Graphic presentation of UVA-B irradiation registered during the experiments
Mentions: Figure 3 illustrates the variation of UV fluency rate for the non-cloudy days, corresponding to a calendar date from 15 of July to 15 of august, 2012. The results revealed that the intensity of UV irradiation increased from 7.30 a.m. to 13.30 p.m.; with the highest intensity recorded on 13.30 p.m. as 5265 μW/Cm2, and later the fluency of UV rate decreased until 16 p.m. as 3650 μW/Cm2, corresponding to the end point of the experiments. This finding shows that Tehran has an appropriate status for use of SODIS process associated with the technique of KPS for water disinfection and the enhanced active radical formation procedures by solar irradiation which can be applied as innovative techniques for the safe water preservation. As shown in Fig. 3, based on Tehran local time and UV fluency and the calendar time rate from July to august, it can be concluded that the local time of 10 a.m. to 16 p.m. (6 h exposure) is the best time for application of SODIS with UV irradiation for water disinfection. Based on these results, it can be claimed that Iran’s geographical latitude (25° 3′ to 35° 47′ N and 44° 5′ to 63° 18′ S) provided the appropriate status for development and application of SODIS technique as a simple method for safe water provision, especially in remote and low income areas.

Bottom Line: Tremendous amount of researches have investigated the issue of water photodisnfection.The highest value of UVA solar irradiation measured at 13.30 p.m was 5510 μW/Cm(2).For bacterial density of 1000 cell/ml, increasing KPS dosage up to 0.7 mMol/l had no improved effect; however, beyond this dosage the disinfection time decreased to 1 h.

View Article: PubMed Central - PubMed

Affiliation: Health Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran.

ABSTRACT

Background: Tremendous amount of researches have investigated the issue of water photodisnfection. The aim of this research is to illustrate the influences of bacterial density, turbidity, exposure time and potassium persulfate (KPS) dosage on the efficacy of associated solar disinfection (SODIS) with KPS for E. coli (ATCC: 25922) eradication as an efficient and inexpensive process.

Methods: Desired bacterial density and turbidity was achieved by spiking of 0.5 Mc Farland (1.5×10(8) cell/ml) and sterile soil slurry in 1 liter of the commercially bottled water.

Results: The highest value of UVA solar irradiation measured at 13.30 p.m was 5510 μW/Cm(2). Increase of bacterial density from 1000 to 1500 cell/ml led to an increase in disinfection lapse time, except in 2 mMol/l KPS. Spiking of 0.1 mMol/l of KPS was not effective; however, increase of KPS dosage from 0.1 mMol/l to 0.7, 1.5 and 2 mMol/l led to the enhancement of disinfection time from 4 h to 3 h and 1 h, respectively. For bacterial density of 1000 cell/ml, increasing KPS dosage up to 0.7 mMol/l had no improved effect; however, beyond this dosage the disinfection time decreased to 1 h. Without KPS and up to 150 NTU within 4 h exposure time, E. coli disinfection was completed. In 2 mMol/l KPS and 1000 and 1500 cell/ml, the 2 h contact time was sufficient up to 150 and 100 NTU, respectively; moreover, complete disinfection was not achieved at higher turbidity.

Conclusion: Association of KPS with SODIS can lead to decreasing of water disinfection time.

No MeSH data available.


Related in: MedlinePlus