Sustainable photocatalytic disinfection of four representative pathogenic bacteria isolated from real water environment by immobilized TiO2-based composite and its mechanism

2021 ◽  
pp. 131217
Author(s):  
Na Liu ◽  
Jie Ming ◽  
Aditya Sharma ◽  
Xiang Sun ◽  
Naoki Kawazoe ◽  
...  
Keyword(s):  
Pathogenic Bacteria ◽  
Water Environment ◽  
Photocatalytic Disinfection ◽  
Immobilized Tio2

scholarly journals Analysis of migration of pathogenic drug-resistant bacteria to soils and groundwater after fertilization with sewage sludge

PLoS ONE ◽  
2021 ◽  
Vol 16 (12) ◽  
pp. e0256936
Author(s):  
Ewa Stańczyk-Mazanek ◽  
Longina Stępniak
Keyword(s):  
Sewage Sludge ◽  
Sandy Soil ◽  
Pathogenic Bacteria ◽  
Water Environment ◽  
Intestinal Bacteria ◽  
Time Frame ◽  
Resistant Bacteria ◽  
Drug Resistant ◽  
Drug Resistant Bacteria ◽  
One Year

The paper discusses the analysis of the effect of using sewage sludge for fertilization on the level of soil and groundwater contamination with drug-resistant bacteria. Other sanitary contaminants in these environments were also analysed. Composted sewage sludge was introduced into the sandy soil over a period of 6 months. The examinations were conducted under conditions of a lysimetric experiment with the possibility of collecting soil leachates (in natural conditions). The following doses of sewage sludge were used: 0, 10, 20, 30 and 40 t/ha calculated per experimental object containing 10 kg of sandy soil. The research were carried out within the time frame of one year. Dactylis glomerata grass was grown on the fertilized soils. In soils and leachates from soils (which may have polluted groundwater) collected from fertilized experimental objects, the sanitary condition and quantity of drug-resistant bacteria (mainly from the families Enterobacteriaceae and Enterococcus) were analysed one year after fertilization. Their drug resistance to selected antibiotics was also analysed based on current recommendations. The study showed that fertilization with sewage sludge (even after stabilization and hygienization) results in contamination of soil and infiltrating waters with many species of drug-resistant pathogenic bacteria. The lowest level of contamination of soil and water environment was found after the application of sewage sludge at a dose of 10 t/ha. The isolated drug-resistant strains of intestinal bacteria were less sensitive to older generations of antibiotics including cefazolin, ampicillin, and co-amoxiclav.

scholarly journals Antibiotics resistance in pathogenic bacteria isolated from water and sediment around the floating fish farms in the Nha Trang bay

2021 ◽  
Vol 20 (4A) ◽  
pp. 199-209
Author(s):  
Nguyen Kim Hanh ◽  
Nguyen Trinh Duc Hieu ◽  
Nguyen Minh Hieu ◽  
Vo Hai Thi ◽  
Pham Thi Mien ◽  
...  
Keyword(s):  
Antibiotic Resistance ◽  
Pathogenic Bacteria ◽  
Water Environment ◽  
Resistant Bacteria ◽  
Antibiotics Resistance ◽  
Antibiotic Resistant Bacteria ◽  
Antibiotic Resistant ◽  
Water And Sediment ◽  
Nha Trang Bay ◽  
The Impact

To assess the impact of antibiotic use in aquaculture in Nha Trang bay, we conducted this study with the aim of assessing antibiotic resistance of opportunistic pathogenic bacteria isolated from water and sediment around shrimp/fish cages in the Nha Trang bay. 109 strains of Vibrio, Salmonella-Shigella and Aeromonas groups were isolated in the surrounding environment of farming areas in Dam Bay and Hon Mieu. Antimicrobial resistance test of these 109 strains showed that in the water environment in Dam Bay, TET (96.6%) and NIT (92.5%) were the two antibiotics with the highest rates of resistant bacteria while no bacteria were resistant to RIF. All 5 types of antibiotics had a statistically insignificant percentage of antibiotic-resistant bacteria in water samples at Hon Mieu, ranging from 33.3% to 68.9%. Also in the water environment, the rate of antibiotic-resistant bacteria in Dam Bay was not influenced by the distance to the cages (42.5–66.6%). Meanwhile, in Hon Mieu, the highest rate of resistant bacteria was observed at the distance of 200 m (100%) away from cages and the lowest rate at the distance of 100 m (20%). In the sediment environment around the cages, both the Dam Bay and Hon Mieu farming areas showed the highest rates of antibiotic-resistant bacteria against TET, NIF and RIF had the lowest rate of resistant bacteria. Among the total of 109 strains tested for antibiotic resistance, 2 strains labeled TCBS_HM200 m and SS_HM200 m were found to be resistant to all 5 tested antibiotics. These two strains were respectively identified as Vibrio harveyi and Oceanimonas sp.

Titanium Dioxide/UV Photocatalytic Disinfection in Fresh Carrots

2007 ◽  
Vol 70 (1) ◽  
pp. 97-101 ◽  
Author(s):  
MIHEE CHO ◽  
YOONJUNG CHOI ◽  
HYOJIN PARK ◽  
KWANSIK KIM ◽  
GUN-JO WOO ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Salmonella Typhimurium ◽  
Pathogenic Bacteria ◽  
Aerobic Bacteria ◽  
Photocatalytic Reaction ◽  
E Coli ◽  
Photocatalytic Disinfection ◽  
Washing Process ◽  
Fresh Vegetables ◽  
Bactericidal Effects

Increased occurrences of fresh produce–related outbreaks of foodborne illness have focused attention on effective washing processes for fruits and vegetables. A titanium dioxide (TiO2) photocatalytic reaction under UV radiation provides a high rate of disinfection. The photo-killing effects of TiO2 on bacteria in liquid cultures under experimental conditions have been widely studied. However, the disinfection effects of the TiO2 photocatalytic reaction on fresh vegetables during a washing process have not been evaluated. Our objectives were to design a pilot-scale TiO2/UV photocatalytic reactor for fresh carrots and to compare the bactericidal effects of the TiO2/UV reaction against bacteria in liquid media and on carrots. TiO2/UV photocatalytic reactions for 40, 60, and 30 s were required for the complete killing of Escherichia coli, Salmonella Typhimurium, and Bacillus cereus (initial counts of approximately 6.7 log CFU/ml), respectively. The counts of total aerobic bacteria in fresh carrots and foodborne pathogenic bacteria in inoculated carrots were also measured. Counts of total aerobic bacteria were reduced by 1.8 log CFU/g after TiO2/UV photocatalytic disinfection for 20 min compared with a 1.1-log CFU/g reduction by UV alone. E. coli, Salmonella Typhimurium, and B. cereus (8 log CFU/ml) were inoculated onto carrots, and the number of surviving bacteria in carrots was determined after treatment. The TiO2/UV treatment exhibited 2.1-, 2.3-, and 1.8-log CFU/g reductions in the counts of E. coli, Salmonella, Typhimurium, and B. cereus, respectively, compared with 1.3-, 1.2-, and 1.2-log CFU/g reductions by UV alone. The TiO2/UV photocatalyst reaction showed significant bactericidal effects, indicating that this process is applicable to nonthermal disinfection of fresh vegetables.

scholarly journals Comparative genomics of two Shewanella xiamenensis strains isolated from a pilgrim before and during travels to the Hajj

Gut Pathogens ◽  
2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Thongpan Leangapichart ◽  
Linda Hadjadj ◽  
Philippe Gautret ◽  
Jean-Marc Rolain
Keyword(s):  
Genome Size ◽  
Pathogenic Bacteria ◽  
Capsular Polysaccharide ◽  
Draft Genome ◽  
Water Environment ◽  
Antibiotic Resistance Genes ◽  
Genomic Analysis ◽  
Comparative Genomic ◽  
Whole Genome ◽  
Genome Sequences

Abstract Background Shewanella xiamenensis has been reported in water environment and in patients and can act as the originator of oxacillinase in gram-negative bacteria. In order to assess genome plasticity and its functional properties related diarrhea symptoms in pilgrim, comparisons of draft genome sequences of the two isolates were conducted with other closely related genomes. Results We isolated S. xiamenensis 111B and 111D strains from a pilgrim before travels to the Hajj and during travels with diarrhea symptom, respectively. Whole-genome sequencing showed that draft genome size of 111B strain was 5,008,191 bp, containing 49 kb of a putative plasmid. The genome size of 111D was 4,964,295 bp containing 225 kb of a putative plasmid that shared the backbone sequences with the hospital wastewater strain T17. Comparatively, two Hajj strains are identical at 97.3% identity and 98.7% coverage. They are closely related to river water strain, AS58 by SNPs analysis. Notably, a novel blaOXA-48 allele blaOXA-547 was identified in 111D, sharing 99.5% identity with blaOXA-546 and blaOXA-894. Multiple copies of virulence specific genes, such as capsular polysaccharide biosynthesis, O-antigen and lasB (vibriolysin related gene) have been identified specifically in 111D, but absent in 111B strain. Conclusions The whole genome sequences of S. xiamenensis strain 111B and 111D, including comparative genomic analysis, highlight here the potential for virulence factors that might be related to the cause of diarrhea in humans and also indicate the possible acquisition of pathogenic bacteria, including antibiotic resistance genes or plasmids during the Hajj.

Photocatalytic Disinfection of Bacterial Pollutants Using Suspended and Immobilized TiO2 Powders

2012 ◽  
Vol 88 (3) ◽  
pp. 728-735 ◽  
Author(s):  
Sarah Ede ◽  
Louise Hafner ◽  
Patrick Dunlop ◽  
John Byrne ◽  
Geoffrey Will
Keyword(s):  
Photocatalytic Disinfection ◽  
Immobilized Tio2

scholarly journals The Kinetic of Decolorizing Reactive Orange 122 (RO122) by Peracetic Acid in the Presence of Metal ions and UV Light

2019 ◽  
Vol 35 (3) ◽  
Author(s):  
Nguyen Thi Kim Giang ◽  
Cao The Ha ◽  
Vu Ngoc Duy
Keyword(s):  
Catalytic Activity ◽  
Metal Ions ◽  
Peracetic Acid ◽  
Metal Ion ◽  
Pathogenic Bacteria ◽  
Municipal Wastewater ◽  
Uv Light ◽  
Water Environment ◽  
Ion Concentration ◽  
Reactive Orange

Abstract: The kinetic of decolorizing Reactive Orange 122 (RO122) by peracetic acid (PAA) in the presence of metal ionsand UV light at 24 ± 1oChas been studied in this research. All experiments were conducted in a 500 mL reactor in which concentrations of peracetic acid were applied in large excess comparingto reactive orange 122. Four metal ions were tested for catalytic activity including Mn2+, Cu2+, Co2+, and Fe3+. The effects of metal ion concentration and pH were evaluated for the ion having the highest activity. Conbination of PAA and UV light was also tested.In this study, the variation of the dye concentration was monitored by measuring light absorption at the maximum absorption wavelength of Reactive Orange 122 (at 493 nm). The obtained results showed that Co2+ion has the highest catalytic activity. The rate of decolorization increases as the concentration of Co2+ and pH increases. Under UV light irradiation, PAA exhibited higher activity comparing to H2O2. This phenomenon can be explained by weaker O-O linkage in PAA. Keywords Peracetic acid, reactive orange 122, kinetics, UV light. References [1] P. Krizman , F. Kovac, P. F. Tavcer, Bleaching of cotton fabric with peracetic acid in the presence of different activators, Color. Technol. 121 (2005) 304 - 309.[2] D. P. Barros, V. L. Silva, H. Hamalainen, J. L. Colodette, Effect of last stage bleaching with peracetic acid on brightness development and properties of eucalyptus pulp, Bioresource 5 (2) (2010) 881 - 898.[3] D. S. R. Gehr, T. A. Bartrand, L. Liberti, M. Notarnicola, A. Dell’Erba, D. Falsanisi, C. N. Haas, Wastewater Disinfection by Peracetic Acid:Assessment of Models for Tracking Residual Measurements and Inactivation, Water Environment Research 79 (7) (2007) 775 - 787. [4] M. Kitis, Disinfection of wastewater with peraceticacid: a review, Environment International 30 (2004) 47–55.[5] S. Bonetta, C. Pignata, E. Lorenzi, M. D. Ceglia,L. M., S. Bonetta, G. Gilli, E. Carraro, Peracetic Acid (PAA) Disinfection: Inactivation ofMicrobial Indicators and Pathogenic Bacteria ina Municipal Wastewater Plant, Water 9 (2017) 427 https://doi.org/10.3390/w9060427.[6] R. D. Bach, P. Y. Ayala, H. B. Schlegel, A Reassessment of the Bond Dissociation Energies ofPeroxides. An ab Initio Study, J. Am. Chem. Soc. 118 (1996) 12758-12765.[7] H. M. N. H. IrvingR. J. P. Williams, The stability of transition-metal complexes, J. Chem. Soc. (1953) 3192  

scholarly journals Detection of potentially pathogenic Arcobacter spp. in Bangkok canals and the Chao Phraya River

2021 ◽  
Author(s):  
Noriko Tomioka ◽  
Wilasinee Yoochatchaval ◽  
Yasuyuki Takemura ◽  
Norihisa Matsuura ◽  
Tsuyoshi Danshita ◽  
...  
Keyword(s):  
16S Rdna ◽  
Water Samples ◽  
Pathogenic Bacteria ◽  
Water Environment ◽  
Oxygen Demand ◽  
High Density ◽  
Public Health Issue ◽  
E Coli ◽  
Drainage Canals ◽  
Chao Phraya River

Abstract The management of pathogenic bacteria in waterways is a public health issue. Here, we investigated the concentrations of potentially pathogenic bacteria, Arcobacter spp. and Campylobacter spp., and Escherichia coli, by quantifying species-specific genes in surface water samples from canals and the Chao Phraya River from June 2017 to June 2018 in Bangkok, Thailand. We assessed the relationship between the specific bacterial concentrations, water quality, and seasonal changes. Arcobacter spp. were detected at high density in all samples and showed seasonal fluctuations according to analyses based on 16S rDNA and the invasion gene ciaB. High levels of 16S rDNA and dut gene of E. coli were detected in the polluted drainage canals. A high correlation was observed between E. coli and chemical (COD) and biochemical oxygen demand (BOD), suggesting that untreated domestic wastewater was the source of the E. coli. In contrast, Arcobacter spp. were detected with high density even in water samples with relatively low COD, suggesting that Arcobacter spp. are more likely than E. coli to survive in the water environment. The analysis of 16S rDNA and ciaB gene sequence analyses indicated that the Arcobacter spp. isolated from the drainage canals were A. butzleri and A. cryaerophilus.

Probiotic Displaces Pathogenic Bacteria

2006 ◽  
Vol 37 (7) ◽  
pp. 48
Author(s):  
ERIK GOLDMAN
Keyword(s):  
Pathogenic Bacteria
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