Evaluation of the Solar Water Disinfection Process (SODIS) Against Cryptosporidium parvum Using a 25-L Static Solar Reactor Fitted with a Compound Parabolic Collector (CPC)

Fontán-Sainz, María; Goméz-Couso, Hipólito; Fernández‐Ibáñez, Pilar; Ares-Mazás, Elvira

doi:10.4269/ajtmh.2012.11-0325

Cited by 22 publications

(11 citation statements)

References 30 publications

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“…In contrast, Wilson demonstrated that there was no obvious trend between the presence of inorganic kaolin particles across a range of turbidity levels in water samples from 0–200 NTU and E .coli log reduction under various sunlight irradiances for 7 h [28]. In another recent research study by Fontán-Sainz et al ([2012]) using a solar CPC reactor, there was a significant loss of efficiency in the inactivation of Crytosporidium parvum oocysts under full sunlight conditions when the water turbidity increased from 5 to 30 NTU [46]. The study of Wilson [28] used a batch culture reactor whereas Fontán-Sainz et al [46] used an uncatalysed solar system for their disinfection treatment and these are both different methods compared to the present study using the continuous flow TFFBR system.…”

Section: Discussionmentioning

confidence: 99%

“…In another recent research study by Fontán-Sainz et al ([2012]) using a solar CPC reactor, there was a significant loss of efficiency in the inactivation of Crytosporidium parvum oocysts under full sunlight conditions when the water turbidity increased from 5 to 30 NTU [46]. The study of Wilson [28] used a batch culture reactor whereas Fontán-Sainz et al [46] used an uncatalysed solar system for their disinfection treatment and these are both different methods compared to the present study using the continuous flow TFFBR system. The present study used a different TiO 2 reactor (immobilised form) and found a similar pattern of decreased microbial inactivation with increased turbidity.…”

Section: Discussionmentioning

confidence: 99%

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Thin-film fixed-bed reactor for solar photocatalytic inactivation of Aeromonas hydrophila: influence of water quality

2012

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BackgroundControlling fish disease is one of the major concerns in contemporary aquaculture. The use of antibiotics or chemical disinfection cannot provide a healthy aquaculture system without residual effects. Water quality is also important in determining the success or failure of fish production. Several solar photocatalytic reactors have been used to treat drinking water or waste water without leaving chemical residues. This study has investigated the impact of several key aspects of water quality on the inactivation of the pathogenic bacterium Aeromonas hydrophila using a pilot-scale thin-film fixed-bed reactor (TFFBR) system.ResultsThe level of inactivation of Aeromonas hydrophila ATCC 35654 was determined using a TFFBR with a photocatalytic area of 0.47 m2 under the influence of various water quality variables (pH, conductivity, turbidity and colour) under high solar irradiance conditions (980–1100 W m-2), at a flow rate of 4.8 L h-1 through the reactor. Bacterial enumeration were obtained through conventional plate count using trypticase soy agar media, cultured in conventional aerobic conditions to detect healthy cells and under ROS-neutralised conditions to detect both healthy and sub-lethally injured (oxygen-sensitive) cells. The results showed that turbidity has a major influence on solar photocatalytic inactivation of A. hydrophila. Humic acids appear to decrease TiO2 effectiveness under full sunlight and reduce microbial inactivation. pH in the range 7–9 and salinity both have no major effect on the extent of photoinactivation or sub-lethal injury.ConclusionsThis study demonstrates the effectiveness of the TFFBR in the inactivation of Aeromonas hydrophila under the influence of several water quality variables at high solar irradiance, providing an opportunity for the application of solar photocatalysis in aquaculture systems, as long as turbidity remains low.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Thin-film fixed-bed reactor for solar photocatalytic inactivation of Aeromonas hydrophila: influence of water quality

2012

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“…Previous studies have reported a 0.1 to 3 log 10 inactivation of C. parvum oocysts by solar inactivation. [11][12][13][14][15][16][17][18][19][20] This reported variation in inactivation efficiency could be attributed to the differences in the oocyst source, the UV transmission spectrum of reactor material, solution composition, temperature, and radiation spectrum used in these studies. The importance of solar spectrum was suggested by higher oocyst inactivation in UV transmitting containers such as borosilicate glass tubes 11,12,15,16 compared to plastic containers that block solar UV transmission.…”

Section: Introductionmentioning

confidence: 95%

Inactivation mechanisms of cryptosporidium parvum oocysts by solar ultraviolet irradiation

Liu

Dong

Kuhlenschmidt

et al. 2015

Environ. Sci.: Water Res. Technol.

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“…Most of rural peoples in Ethiopia are not aware that SODIS is used as a HWT method [ 31 ]; whereas, over five million people in more than 50 developing countries disinfect their regular drinking-water by using SODIS [ 32 ]. Today, laboratory studies have consistently shown the efficiency of SODIS in significantly reducing the risk of a microbial contamination of drinking-water [ 33 , 34 ]. Though, an evidence-based health effect of SODIS intervention at the household level is limited, diarrheal disease problems could be prevented through improving the quality of drinking-water [ 35 ].…”

Section: Introductionmentioning

confidence: 99%

The effect of SODIS water treatment intervention at the household level in reducing diarrheal incidence among children under 5 years of age: a cluster randomized controlled trial in Dabat district, northwest Ethiopia

Bitew

Gete

Biks

et al. 2018

Trials

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BackgroundSolar Disinfection (SODIS) of water is an economical, user-friendly, and environmentally safe household water treatment method that has been advocated as a means of decreasing the burden of diarrhea among children under 5 years of age. Laboratory studies have consistently shown the efficacy of the SODIS method to destroy waterborne pathogens. However, the evidence-based health effect of a SODIS intervention at the household level is limited. The main aim of the study was to examine the effectiveness of a SODIS intervention in reducing the incidence of diarrhea among under-five children.MethodsA community-based, cluster randomized controlled trial was conducted, over 6 months from 10 January to 7 July 2016, in 28 rural villages of northwest Ethiopia. In the intervention group, 384 children in 279 households received polyethylene terephthalate (PET) bottles, and in the control group 394 children in 289 households who continued to use their usual drinking-water sources were included in the trial. The study compared diarrheal incidence among the intervention group children who were exposed to SODIS household water treatment and the control group children who were not exposed to such water treatment. A generalized estimating equation (GEE) model was used to compute the adjusted incidence rate ratio and the corresponding 95% confidence interval.ResultsIn this trial, the overall SODIS compliance was 90.6%. The incidence of diarrhea was 8.3 episodes/100 person-week observations in the intervention group compared to 15.3 episodes/100 person-week observations in the control group. A statistically significant reduction was observed in the incidence of diarrhea in the intervention group compared to the control (adjusted IRR 0.60 (95% CI 0.52, 0.70) with a corresponding prevention of 40% (95% CI: 34, 48).ConclusionThe SODIS intervention substantially reduced the incidence of diarrhea among under-five children in a rural community of northwest Ethiopia. This indicates that a SODIS intervention is an invaluable strategy that needs to be integrated with the National Health Extension Program to be addressed to rural communities.Trial registrationClinical Trial Registry India, ID: CTRI/2017/09/009640. Registered retrospectively on 5 September 2017.Electronic supplementary materialThe online version of this article (10.1186/s13063-018-2797-y) contains supplementary material, which is available to authorized users.

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Evaluation of the Solar Water Disinfection Process (SODIS) Against Cryptosporidium parvum Using a 25-L Static Solar Reactor Fitted with a Compound Parabolic Collector (CPC)

Cited by 22 publications

References 30 publications

Thin-film fixed-bed reactor for solar photocatalytic inactivation of Aeromonas hydrophila: influence of water quality

Thin-film fixed-bed reactor for solar photocatalytic inactivation of Aeromonas hydrophila: influence of water quality

Inactivation mechanisms of cryptosporidium parvum oocysts by solar ultraviolet irradiation

The effect of SODIS water treatment intervention at the household level in reducing diarrheal incidence among children under 5 years of age: a cluster randomized controlled trial in Dabat district, northwest Ethiopia

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