Inactivation of E. coli, Enterococcus spp., somatic coliphage, and Cryptosporidium parvum in wastewater by peracetic acid (PAA), sodium hypochlorite, and combined PAA-ultraviolet disinfection

2020 ◽  
Vol 6 (1) ◽  
pp. 197-209 ◽  
Author(s):  
Abdulrahman H. Hassaballah ◽  
Tanmay Bhatt ◽  
Jeremy Nyitrai ◽  
Ning Dai ◽  
Lauren Sassoubre
Keyword(s):  
Sodium Hypochlorite ◽  
Cryptosporidium Parvum ◽  
Peracetic Acid ◽  
Ecosystem Health ◽  
Ultraviolet Disinfection ◽  
E Coli ◽  
Enterococcus Spp ◽  
Wastewater Disinfection ◽  
Somatic Coliphage

Wastewater disinfection is important to protect human and ecosystem health.

A pilot-scale study of peracetic acid and ultraviolet light for wastewater disinfection

2019 ◽  
Vol 5 (8) ◽  
pp. 1453-1463 ◽  
Author(s):  
Abdulrahman H. Hassaballah ◽  
Jeremy Nyitrai ◽  
Christine H. Hart ◽  
Ning Dai ◽  
Lauren M. Sassoubre
Keyword(s):  
Ultraviolet Light ◽  
Peracetic Acid ◽  
Pilot Scale ◽  
Fecal Coliforms ◽  
Treated Wastewater ◽  
E Coli ◽  
Wastewater Disinfection ◽  
Somatic Coliphage

At the pilot-scale, peracetic acid effectively inactivates fecal coliforms,E. coliandEnterococcusspp. in secondary and tertiary treated wastewater. The addition of UV to PAA treatment increases inactivation of somatic coliphage.

Pilot-plant comparative study of peracetic acid and sodium hypochlorite wastewater disinfection

2003 ◽  
Vol 37 (1) ◽  
pp. 78-94 ◽  
Author(s):  
E Veschetti ◽  
D Cutilli ◽  
L Bonadonna ◽  
R Briancesco ◽  
C Martini ◽  
...  
Keyword(s):  
Comparative Study ◽  
Sodium Hypochlorite ◽  
Peracetic Acid ◽  
Pilot Plant ◽  
Wastewater Disinfection

scholarly journals Effect of different chemical compounds and ultrasound bath on the sanitization of minimally processed carrots

2020 ◽  
pp. 2087-2096
Author(s):  
Gabriela Lino Freitas ◽  
Gabriella Cristina Borges Melo ◽  
Fernanda Torqueti Toloi ◽  
Priscila Cristina Bizam Vianna ◽  
Letícia Dias dos Anjos Gonçalves ◽  
...  
Keyword(s):  
Organic Compounds ◽  
Sodium Hypochlorite ◽  
Peracetic Acid ◽  
Chemical Compounds ◽  
Minimally Processed ◽  
E Coli ◽  
Sodium Dichloroisocyanurate ◽  
Ultrasound Bath

The objective of this study was to evaluate the effect of the use of different chemical compounds combined with ultrasound bath on the sanitization of minimally processed carrots. The sanitizers sodium hypochlorite, peracetic acid, and sodium dichloroisocyanurate were investigated, all of them associated with the ultrasound bath, and the aerobic mesophiles and E. coli counts were evaluated. Sodium hypochlorite associated with ultrasound reduced the population of aerobic mesophiles and E. coli by 0.23 and 1.88 log cycles, respectively. For sodium dichloroisocyanurate associated with ultrasound, the reduction was 3.06 and 2.76 log cycles, while for the association with peracetic acid, this reduction was 2.72 and 2.35 log cycles. Thus, the effect of the ultrasound bath and sodium dichloroisocyanurate increased the decontamination efficiency of the minimally processed carrots. In addition, there is an alternative to the use of sodium hypochlorite, once they are not involved in reactions with organic compounds and the formation of trihalomethanes, which are harmful to health.

scholarly journals Evaluation by Flow Cytometry of Escherichia coli Viability in Lettuce after Disinfection

Antibiotics ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 14
Author(s):  
Pilar Teixeira ◽  
Bruna Fernandes ◽  
Ana Margarida Silva ◽  
Nicolina Dias ◽  
Joana Azeredo
Keyword(s):  
Escherichia Coli ◽  
Flow Cytometry ◽  
Sodium Hypochlorite ◽  
Peracetic Acid ◽  
Food Microbiology ◽  
Lower Percentage ◽  
E Coli ◽  
Promising Tool ◽  
Microbiological Techniques ◽  
Foodborne Outbreaks

Foodborne outbreaks due to the consumption of ready-to-eat vegetables have increased worldwide, with Escherichia coli (E. coli) being one of the main sources responsible. Viable but nonculturable bacteria (VBNC) retain virulence even after some disinfection procedures and constitute a huge problem to public health due to their non-detectability through conventional microbiological techniques. Flow cytometry (FCM) is a promising tool in food microbiology as it enables the distinction of the different physiological states of bacteria after disinfection procedures within a short time. In this study, samples of lettuce inoculated with E. coli were subject to disinfection with sodium hypochlorite at free chlorine concentrations of 5, 10, 25, 50, and 100 mg·L−1 or with 35% peracetic acid at concentrations of 5, 10, 25, and 50 mg·L−1. The efficiency of these disinfectants on the viability of E. coli in lettuce was evaluated by flow cytometry with LIVE/DEAD stains. Results from this study suggest that FCM can effectively monitor cell viability. However, peracetic acid is more effective than sodium hypochlorite as, at half the concentration, it is enough to kill 100% of bacteria and always induces a lower percentage of VBNC. Finally, we can conclude that the recommended levels of chemical disinfectants for fresh fruit and vegetables are adequate when applied in lettuce. More importantly, it is possible to ensure that all cells of E. coli are dead and that there are no VBNC cells even with lower concentrations of those chemicals. These results can serve as guidance for lettuce disinfection, improving quality and the safety of consumption.

Effects of Different Disinfection Treatments on the Natural Microbiota of Lettuce

2003 ◽  
Vol 66 (9) ◽  
pp. 1697-1700 ◽  
Author(s):  
M. S. NASCIMENTO ◽  
N. SILVA ◽  
M. P. L. M. CATANOZI ◽  
K. C. SILVA
Keyword(s):  
Acetic Acid ◽  
Sodium Hypochlorite ◽  
Peracetic Acid ◽  
Initial Level ◽  
Total Coliform ◽  
Total Coliforms ◽  
E Coli ◽  
Sodium Dichloroisocyanurate ◽  
Mold And Yeast ◽  
Natural Microbiota

In this study, water and eight sanitizing solutions (vinegar at 6, 25, and 50%; acetic acid at 2 and 4%; peracetic acid at 80 ppm, sodium hypochlorite at 200 ppm, and sodium dichloroisocyanurate at 200 ppm) were compared in terms of their effectiveness against the natural microbiota of lettuce. All of the samples were kept in contact with the sanitizing solutions for 15 min, and the effectiveness of a sanitizing agent was evaluated on the basis of the number of decimal reductions of the total aerobic mesophilic count, the mold and yeast count, the total coliform count, and the Escherichia coli count. The average initial levels of these organisms in the samples were 6.94 log10 CFU/g for aerobic mesophilic microorganisms, 5.62 log10 CFU/g for molds and yeasts, and 3.25 log10 CFU/g for total coliforms. Of 10 samples analyzed, only 4 contained E. coli, and the average initial level of this microorganism in these 4 samples was 1.64 log10 CFU/g. Salmonella was not detected in any of the samples tested. The decimal reductions of the populations of aerobic mesophilic microorganisms, molds and yeasts, total coliforms, and E. coli were 0.78, 0.87, 0.82, and >0.14 log10 CFU/g, respectively, in water; 2.89, >3.41, >2.21, and >0.26 log10 CFU/g, respectively, in 50% vinegar; 2.42, >3.20, >1.99, and >0.26 log10 CFU/g, respectively, in 25% vinegar; 1.83, 2.57, 1.58, and >0.26 log10 CFU/g, respectively, in 6% vinegar; 3.91, >3.58, >2.25, and >0.26 log10 CFU/g, respectively, in 4% acetic acid; 3.37, >3.53, >2.25, and >0.26 log10 CFU/g, respectively, in 2% acetic acid; 1.85, 2.32, 1.44, and >0.20 log10 CFU/g, respectively, in 80 ppm of peracetic acid; 2.63, 2.75, 1.91, and >0.26 log10 CFU/g, respectively, in 200 ppm of sodium hypochlorite; and 3.23, >3.08, >1.95, and >0.26 log10 CFU/g, respectively, in 200 ppm of sodium dichloroisocyanurate. Statistical analysis of the results showed that the effectiveness levels for all of the sanitizing agents tested were equivalent to or higher than that for sodium hypochlorite at 200 ppm.

scholarly journals Water and Wastewater Disinfection with Peracetic Acid and UV Radiation and Using Advanced Oxidative Process PAA/UV

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Jeanette Beber de Souza ◽  
Fernanda Queiroz Valdez ◽  
Rhuan Felipe Jeranoski ◽  
Carlos Magno de Sousa Vidal ◽  
Grasiele Soares Cavallini
Keyword(s):  
Uv Radiation ◽  
Peracetic Acid ◽  
Combined Method ◽  
Experimental Conditions ◽  
E Coli ◽  
Wastewater Disinfection ◽  
Combined Action ◽  
Oxidative Processes ◽  
Water And Wastewater ◽  
The Individual

The individual methods of disinfection peracetic acid (PAA) and UV radiation and combined process PAA/UV in water (synthetic) and sanitary wastewater were employed to verify the individual and combined action of these advanced oxidative processes on the effectiveness of inactivation of microorganisms indicators of fecal contaminationE. coli, total coliforms (in the case of sanitary wastewater), and coliphages (such as virus indicators). Under the experimental conditions investigated, doses of 2, 3, and 4 mg/L of PAA and contact time of 10 minutes and 60 and 90 s exposure to UV radiation, the results indicated that the combined method PAA/UV provided superior efficacy when compared to individual methods of disinfection.

scholarly journals Exposure Assessment of Airborne Bacteria Emitted from Swine Manure Composting Plant

Processes ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 1283
Author(s):  
Ki-Youn Kim
Keyword(s):  
Relative Humidity ◽  
Environmental Factors ◽  
Swine Manure ◽  
Airborne Bacteria ◽  
Particulate Matters ◽  
Distribution Characteristics ◽  
E Coli ◽  
Enterococcus Spp ◽  
Staphylococcus Spp ◽  
Rotary Type

This study was performed to investigate the distribution characteristics of airborne bacteria emitted from swine manure composting plants. The types of swine manure composting plants selected for the survey in this study were as follows: screw type, rotary type, and natural dry type. Mean levels of airborne bacteria in swine manure composting plants were 7428 (±1024) CFU m−3 for the screw type, 3246 (±1407) CFU m−3 for the rotary type, and 5232 (±1217) CFU m−3 for the natural dry type, respectively. Based on the results obtained from this study, the swine manure composting plant operated by screw type showed the highest concentration of airborne bacteria, followed by the natural dry type and rotary type. The monthly concentration of airborne bacteria was the highest in August and the lowest in November, regardless of the type of swine manure composting plant. The respirable size of airborne bacteria accounted for about 50% of the total. The ratio of respirable to the total quantity of airborne bacteria was 50%. The correlation relationships between airborne bacteria and environmental factors (temperature, relative humidity, particulate matters, and odor) were not found to be significant in the swine manure composting plants. The predominant genera of airborne bacteria identified were Micrococcus spp., Staphylococcus spp., Escherichia(E-coli) spp., Enterococcus spp., and Enterobacteriaceae spp.

Detection of antibiotic resistant E. coli and Enterococcus spp. in stool of healthy growing children in Portugal

2009 ◽  
Vol 49 (6) ◽  
pp. 503-512 ◽  
Author(s):  
Ângela Barreto ◽  
Bruno Guimarães ◽  
Hajer Radhouani ◽  
Carlos Araújo ◽  
Alexandre Gonçalves ◽  
...  
Keyword(s):  
Antibiotic Resistant ◽  
E Coli ◽  
Enterococcus Spp
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