Reduction of Escherichia coli bacteria from contaminated water by combining hydrogen peroxide, ozone and ultraviolet light

2013 ◽  
Vol 13 (3) ◽  
pp. 782-789 ◽  
Author(s):  
Bassam Tawabini ◽  
Amjad Khalil ◽  
Basim Abussaud
Keyword(s):  
Escherichia Coli ◽  
Hydrogen Peroxide ◽  
Ultraviolet Light ◽  
Water Samples ◽  
Organic Contaminants ◽  
Inactivation Rate ◽  
Contaminated Water ◽  
Butyl Ether ◽  
Tertiary Butyl ◽  
Escherichia Coli Bacteria

This study demonstrates the reduction of Escherichia coli bacteria from contaminated water when the water is treated with advanced oxidation processes utilising the following combinations: hydrogen peroxide (H2O2) and ozone (O3), ultraviolet light (UV) and hydrogen peroxide (H2O2), and ultraviolet light (UV) and ozone (O3). Approximately 1 × 108cell/mL of E. coli were spiked into water samples contaminated with 500 ppb of methyl tertiary butyl ether (MTBE) and benzene. Water samples were then treated in a bench-scale photoreactor using 15 W low pressure (LP) and 150 W medium pressure (MP) UV lamps. Hydrogen peroxide at 20, 50 and 100 ppm and ozone at 1, 2 and 5 ppm were used along with the UV irradiation to generate the hydroxyl radicals (.OH) needed to degrade organic contaminants such as MTBE and benzene and most likely destroy bacteria. The results of the study showed that, under the study conditions, no effect of benzene or MTBE was observed on the inactivation rate of the bacteria. Moreover, results showed that the combined effect of the LP 15 W UV lamp with 2 ppm O3 or with 50 ppm H2O2 showed the highest inactivation rate of bacteria within 5 min. The H2O2/O3 process showed high disinfection capability at high dosages of peroxide (50 ppm) and O3 (2 and 5 ppm).

scholarly journals Simultaneous Removal of MTBE and Benzene from Contaminated Groundwater Using Ultraviolet-Based Ozone and Hydrogen Peroxide

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Bassam S. Tawabini
Keyword(s):  
Hydrogen Peroxide ◽  
Contact Time ◽  
Methyl Tertiary Butyl Ether ◽  
Simultaneous Removal ◽  
Butyl Ether ◽  
Tertiary Butyl ◽  
No Removal ◽  
Groundwater Samples ◽  
Uv Lamps ◽  
Different Levels

Efficiency of ultraviolet-ozone (UV/O3) and ultraviolet-hydrogen peroxide (UV/H2O2) processes was investigated for simultaneous removal of methyl tertiary butyl ether (MTBE) and benzene from contaminated ground water. The photoreactor employed housed 15-watt low pressure (LP) and 150-watt medium pressure (MP) mercury UV lamps. Oxidation of contaminants was studied at two different levels of ozone and hydrogen peroxide. Brackish groundwater samples were spiked with MTBE and benzene up to a concentration of 500 μg L−1. Removal potential was evaluated at different parameters such as UV type and intensity and peroxide and ozone dosages, as well as contact time. Results indicated that no removal of the contaminants was attained when treated with hydrogen peroxide or ozone alone. However, about 50% and 30% removal of MTBE were achieved in 30 minutes when irradiated with MP-UV and LP-UV lamps, respectively. On the other hand, UV/H2O2process was found to be superior in removal of MTBE (90% in 10 min.) and benzene (95% in 5 min.) compared to UV/O3process. Furthermore, removal of benzene was comparatively easier than MTBE in both approaches. It is hence concluded that higher UV intensities and elevated doses of H2O2accelerate simultaneous removal of MTBE and benzene from water.

scholarly journals Instantaneous Water Purification by Deep Ultraviolet Light in Water Waveguide: Escherichia Coli Bacteria Disinfection

Water ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 968 ◽  
Author(s):  
Takahiro Matsumoto ◽  
Ichiro Tatsuno ◽  
Tadao Hasegawa
Keyword(s):  
Escherichia Coli ◽  
Point Source ◽  
Ultraviolet Light ◽  
Water Purification ◽  
Source Characteristics ◽  
Bacterial Contaminants ◽  
Duv Led ◽  
Deep Ultraviolet ◽  
Escherichia Coli Bacteria ◽  
Purification Equipment

The necessity of small water purification equipment has been increasing in recent years as a result of frequent natural disasters. Ultraviolet (UV) radiation treatment is an effective method for the disinfection of bacterial contaminants in water. As an emerging technology, disinfection by deep-ultraviolet light-emitting diodes (DUV-LEDs) is promising. Few studies have used the point-source characteristics of LEDs and have instead replaced mercury vapor lamps with LEDs. Here, we demonstrate the instantaneous purification of contaminated water by combining the point source characteristics of DUV-LEDs with a water waveguide (WW). The principle is based on the WW region acting as an effective DUV disinfector, whereby a high UV dose in a confined WW region can be applied to bacterial contaminants in a short period of time (around one second). We demonstrate the effect of this DUV-LED WW disinfection technique by showing the results of 3-log disinfection levels of water contaminated with Escherichia coli bacteria after a short treatment time. We believe that the combination of the point-source nature of DUV-LED emission, the water-waveguide effect, and a small photovoltaic cell paves the way toward environmentally friendly and emergency preparedness portable water purification equipment that instantaneously supplies clean water just before drinking.

scholarly journals A gastroenteritis outbreak associated with drinking water in a college in northwest China

2018 ◽  
Vol 16 (4) ◽  
pp. 508-515 ◽  
Author(s):  
Lixia Zhang ◽  
Xiu'E Li ◽  
Rui Wu ◽  
Hailong Chen ◽  
Jifeng Liu ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Water Samples ◽  
Northwest China ◽  
Watery Diarrhea ◽  
Contaminated Water ◽  
Gastroenteritis Outbreak ◽  
Duration Of Illness ◽  
Stool Specimens ◽  
Epidemiological Characteristics ◽  
Risk Ratios

Abstract An acute gastroenteritis outbreak occurred at a private college in June 2014 in northwest China. This outbreak involved two teachers and 629 students (range: 17–27 years, average 21.3 years). The main symptoms included non-bloody watery diarrhea, stomach ache, nausea, and vomiting, and the duration of illness ranged from 1 to 7 days. Eight of 18 water samples were disqualified. Thirty-four norovirus (NoV) RNA-positive samples were identified from 48 stool-related samples (genotyping results: 13 GII, 13 GI and 8 GI + GII mixture). Fourteen NoV samples were successfully characterized for genotype, including two GII.6, five GI.6, four GI.3, and three GI.1. Enteropathogenic Escherichia coli (EPEC) and enteroadherent Escherichia coli (EAEC) DNA was detected from patient stool specimens and water samples from well one; two EAEC strains and one EPEC strain were isolated from patient stool specimens. The risk ratios (RRs) associated with wells one and two were 1.66 and 1.49, respectively, and the RR associated with living in north dormitory building one was 2.59. The patients' epidemiological characteristics, symptoms, and duration of illness indicated that NoV-contaminated water might be the origin of this outbreak, and RR analysis suggested that the two wells were linked to the outbreak.

Hierarchically porous BiOCl@NiCo2O4 nanoplates as low-cost and highly efficient catalysts for the discoloration of organic contaminants in aqueous media

2020 ◽  
Vol 44 (1) ◽  
pp. 258-264 ◽  
Author(s):  
Lihua Zhi ◽  
Youyuan Xu ◽  
Shengya Zhang ◽  
Dongcheng Hu ◽  
Jiacheng Liu
Keyword(s):  
Catalytic Activity ◽  
Water Samples ◽  
Organic Contaminants ◽  
Low Cost ◽  
Aqueous Media ◽  
Contaminated Water ◽  
Hierarchically Porous ◽  
Highly Efficient

BiOCl@NiCo2O4 exhibits remarkable catalytic activity and stability and can be used to deal with real contaminated water samples.

A Kinetic Model for the Aqueous Degradation of MTBE by Fe0/H2O2

2007 ◽  
Vol 32 (3) ◽  
pp. 131-151 ◽  
Author(s):  
Nada M. Al-Ananzeha ◽  
John A. Bergendahlb ◽  
Robert W. Thompsona
Keyword(s):  
Kinetic Model ◽  
Organic Contaminants ◽  
Reaction Rate ◽  
Water Solubility ◽  
High Water ◽  
Oxidation Reactions ◽  
Iron Speciation ◽  
Butyl Ether ◽  
Tertiary Butyl ◽  
Mtbe Degradation

Methyl tertiary-butyl ether (MTBE) is a possible human carcinogen that has been used as a gasoline oxygenate at concentrations of up to 15% by volume for about 45 years in the US. However, its high water solubility has exacerbated spills at gasoline stations, sometimes resulting in local groundwater MTBE contamination levels of over 100 mg/L. Advanced oxidation using Fe0 and H2O2 is a promising technique for mineralizing organic contaminants, but current understanding of the remediation chemistry needs to be improved to facilitate design of subsurface or engineered systems. A kinetic model for the degradation of MTBE in batch systems applying zero-valent iron (Fe0) andhydrogen peroxide (H2O2) oxidation in aqueous solution was developed. The model includes: H2O2 and water chemistry, iron speciation, and MTBE oxidation reactions. H2O2/water and MTBE degradation equilibrium and reaction rate parameters were taken from the literature. Reaction rate and equilibrium parameters for iron speciation were taken from the literature, or from our prior work. The rate constant for the dissolution of Fe0 was found from this work. The model was compared to experimental data from the literature for MTBE degradation using Fe0/H2O2

Fishing, trapping and killing of Escherichia coli (E. coli) in potable water

2016 ◽  
Vol 2 (6) ◽  
pp. 931-941 ◽  
Author(s):  
Saumyadeb Dasgupta ◽  
Naga Siva Kumar Gunda ◽  
Sushanta K. Mitra
Keyword(s):  
Escherichia Coli ◽  
Water Samples ◽  
Potable Water ◽  
Contaminated Water ◽  
E Coli ◽  
Innovative Process

An innovative process of effective ‘fishing, trapping and killing’ ofEscherichia coli(E. coli) in contaminated water samples using paper strips is proposed here.

scholarly journals Degradation of boscalid, pyraclostrobin, fenbuconazole, and glyphosate residues by an advanced oxidative process utilizing ultraviolet light and hydrogen peroxide

2020 ◽  
Author(s):  
Blake Skanes ◽  
Jordan Ho ◽  
Keith Warriner ◽  
Ryan S. Prosser
Keyword(s):  
Escherichia Coli ◽  
Hydrogen Peroxide ◽  
Ultraviolet Light ◽  
Pesticide Residues ◽  
Individual Treatment ◽  
Oxidative Process ◽  
Uv C ◽  
Advanced Oxidative Process

AbstractRecently an advanced oxidative process (AOP) combining H2O2 and UV-C light was observed to be effective at controlling Listeria monocytogens (Murray et al., 2018) and Escherichia coli O157:H7 and degrading chlorpyrifos residues on the surface of apples (Ho et al., 2020). Little is known about the application of AOP for the degradation of other pesticide residues. This study examined degradation of boscalid, pyraclostrobin, fenbuconazole and glyphosate by 3% (w/v) H2O2, UV-C (254 nm) irradiation and their combination on apple skin and glass. The extent of degradation was not significantly different between the AOP and optimal individual treatment. However, treatment susceptibility was different with glyphosate most effectively degraded by H2O2 exposure (up to 98% on apple, 3% (w/v) H2O2 at 30□C for 15 min) while boscalid, pyraclostrobin and fenbuconazole were more effectively degraded by UV-C (up to 88%, 100% and 70% degradation after ~11,000 mJ/cm2). Suggestions for possible causes of degradation are proposed.

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