Effect of Storage Conditions on Shelf Stability of Undiluted Neutral Electrolyzed Water

2020 ◽  
Vol 83 (10) ◽  
pp. 1838-1843 ◽  
Author(s):  
ZACHARY BLOCK ◽  
ALIETA EYLES ◽  
ROSS CORKREY ◽  
ROGER STANLEY ◽  
TOM ROSS ◽  
...  
Keyword(s):  
Large Scale ◽  
Antimicrobial Effect ◽  
Storage Conditions ◽  
Electrolyzed Water ◽  
Shelf Stability ◽  
Log Reduction ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Two Temperatures ◽  
Similar Decrease

ABSTRACT Neutral electrolyzed water (NEW) is an oxidizing sanitizer that can be made locally on-site; it is often stored in a ready-to-use format to accumulate the large volumes required for periodic or seasonal use. The shelf stability of NEW sanitizer was, therefore, assessed under various storage conditions to guide the development of protocols for its industrial application. To that end, fresh NEW with an available chlorine concentration (ACC) of 480 mg/L, pH 6.96, and oxidation reduction potential (ORP) of 916 mV was stored under different conditions. These were open or sealed polypropylene bottles, three different surface area–to–volume (SA:V) ratios (0.9, 1.7, and 8.7), and two temperatures (4 and 25°C). NEW stored at 4°C was significantly more stable than NEW stored at 25°C; ACC and pH decreased by 137 mg/L and 0.7, respectively, whereas ORP increased by 23 mV, after 101 days of storage. At 25°C, ACC decreased to <0.01 mg/L after 52 days in bottles with a SA:V ratio of 8.7, with a similar decrease after 101 days in bottles with a SA:V ratio of 1.7. However, pH decreased by up to 3.7 pH units, and ORP increased by up to 208 mV. The antimicrobial efficacy of “aged” electrolyzed oxidizing (EO) water with different ACC and ORP, but the same pH (i.e., 3.4 ± 0.2), was evaluated against Escherichia coli and Listeria innocua to determine any differences in residual antimicrobial activity. EO water with an ACC of ≥7 mg/L and an ORP of 1,094 mV caused a reduction of at least 4.7 log, whereas EO water with nondetectable ACC and considerably high ORP (716 mV) had little antimicrobial effect (<1-log reduction). Results from this study indicate that the efficacy of NEW as a sanitizer for large-scale applications such as horticulture can be maintained for at least 3 months when it is stored in closed containers with low SA:V ratio at low temperatures. HIGHLIGHTS

scholarly journals Antimicrobial Effect of Plasma-Activated Tap Water on Staphylococcus aureus, Escherichia coli, and Candida albicans

Water ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1480
Author(s):  
William Chiappim ◽  
Aline da Graça Sampaio ◽  
Felipe Miranda ◽  
Mariana Fraga ◽  
Gilberto Petraconi ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Candida Albicans ◽  
Tap Water ◽  
Antimicrobial Effect ◽  
Gliding Arc ◽  
Oxidation Reduction ◽  
Treatment Conditions ◽  
Oxidation Reduction Potential

In this study, the potential antimicrobial activity of plasma-activated tap water (PAW) was evaluated against Staphylococcus aureus, Escherichia coli, and Candida albicans. For this, PAW was prepared in a gliding arc plasma system using two treatment conditions: stagnant water and water stirring by a magnetic stirrer, called moving water. Subsequently, their oxidation-reduction potential (ORP), pH, electrical conductivity (σ), and total dissolved solids (TDS) were monitored in different areas of the sample divided according to the depth of the beaker. It was observed that PAW obtained in dynamic conditions showed a more uniform acidity among the evaluated areas with pH 3.53 and ORP of 215 mV. Finally, standardized suspensions of Staphylococcus aureus (ATCC 6538), Escherichia coli (ATCC 10799), and Candida albicans (SC 5314) were treated with PAW, and the reduction of viable cells determined the antimicrobial effect. Our results indicate that the tap water, activated by plasma treatment using gliding arc, is an excellent inactivation agent in the case of Staphylococcus aureus and Escherichia coli. On the other hand, no significant antimicrobial activity was achieved for Candida albicans.

Environmentally-benign cleaning for giga DRAM using electrolyzed water

2001 ◽  
Vol 671 ◽  
Author(s):  
Kunkul Ryoo ◽  
Byeongdoo Kang
Keyword(s):  
Pure Water ◽  
Particle Removal ◽  
Electrolyzed Water ◽  
Particle Distributions ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Water Cleaning ◽  
Concentration Changes ◽  
The Many ◽  
Cleaning Technology

ABSTRACTA present semiconductor cleaning technology is based upon RCA cleaning technology which consumes vast amounts of chemicals and ultra pure water(UPW) and is the high temperature process. Therefore, this technology gives rise to the many environmental issues, and some alternatives such as functional water cleaning are being studied. The electrolyzed water was generated by an electrolysis system which consists of anode, cathode, and middle chambers. Oxidative water and reductive water were obtained in anode and cathode chambers, respectively. In case of NH4Clelectrolyte, the oxidation-reduction potential and pH for anode water(AW) and cathode water(CW) were measured to be +1050mV and 4.8, and -750mV and 10.0, respectively. AW and CW were deteriorated after electrolyzed, but maintained their characteristics for more than 40 minutes sufficiently enough for cleaning. Their deterioration was correlated with CO2 concentration changes dissolved from air. It was known that AW was effective for Cu removal, while CW was more effective for Fe removal. The particle distributions after various particle removal processes maintained the same pattern. In this work, RCA consumed about 9 chemicals, while EW did only 400ml HCl electrolyte or 600ml NH4Cl electrolyte. It was hence concluded that EW cleaning technology would be very effective for eliminating environment, safety, and health(ESH) issues in the next generation semiconductor manufacturing.

scholarly journals Revamp of existing lab-scale electrolytic cell design for electrolyzed water study in cleaning application

Food Research ◽  
2020 ◽  
Vol 4 (S6) ◽  
pp. 146-149
Author(s):  
N.S. Sulaiman ◽  
N.I. Khalid ◽  
E.M.H. Fauzi ◽  
N. Ab Aziz ◽  
N.A. Yusof ◽  
...  
Keyword(s):  
Reduction Potential ◽  
Current Flow ◽  
Chemical Properties ◽  
Electrolytic Cell ◽  
Free Chlorine ◽  
Electrolyzed Water ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Alkaline Electrolyzed Water ◽  
Electrode Plate

The lab-scale electrolytic cell was designed to produce acidic and alkaline electrolyzed water for cleaning study. Electrolyzed water (EW) was produced by electrolysis of a dilute sodium chloride solution. The generation of free chlorine, pH and oxidation-reduction potential from the electrolysis process by the electrolytic cell were far from the expected value. Thus, the lab-scale electrolytic cell was revamped by using the acrylic slot to hold the electrode plate and a membrane holder without metal screws. This revamp work is to reduce the resistance for current flow with the aim to increase the value of chemical properties (pH, oxidation-reduction potential, free chlorine) for acidic and alkaline electrolyzed water. Findings have shown that the current was increased from 0.013A to 2.5A after the revamp process. As a result of the revamp, the value of pH, oxidationreduction potential and free chlorine for acidic electrolyzed water was increased by 1.7 times, 2.7 times, and 20 times higher than previous results respectively. While for alkaline electrolyzed water, the value of pH and oxidation-reduction potential was increased by 1.4 times and 6.2 times higher than previous results respectively.

Effect of Electrolyzed Water on the Disinfection of Bacillus cereus Biofilms: The Mechanism of Enhanced Resistance of Sessile Cells in the Biofilm Matrix

2018 ◽  
Vol 81 (5) ◽  
pp. 860-869 ◽  
Author(s):  
MOHAMMAD SHAKHAWAT HUSSAIN ◽  
MINYEONG KWON ◽  
CHARLES NKUFI TANGO ◽  
DEOG HWAN OH
Keyword(s):  
Bacillus Cereus ◽  
Extracellular Polymeric Substances ◽  
Hypochlorous Acid ◽  
Electrolyzed Water ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Chlorine Ions ◽  
Potential Use ◽  
Insight Into ◽  
Dispersal Activity

ABSTRACT This study examined the disinfection efficacy and mechanism of electrolyzed water (EW) on Bacillus cereus biofilms. B. cereus strains, ATCC 14579 and Korean Collection for Type Cultures (KCTC) 13153 biofilms, were formed on stainless steel (SS) and plastic slide (PS) coupons. Mature biofilms were treated with slightly acidic EW (SAEW), acidic EW (AEW), and basic EW (BEW). SAEW (available chlorine concentration, 25 ± 1.31 mg L−1; pH 5.71 ± 0.16; and oxidation reduction potential, 818 to 855 mV) reduced ATCC 14579 biofilms on plastic slides to below the detection limit within 30 s. However, biofilms on SS coupons showed a higher resistance to the SAEW treatment. When the disinfection activities of three types of EW on biofilms were compared, AEW showed a higher bactericidal activity, followed by SAEW and BEW. In contrast, BEW showed a significantly (P < 0.05) higher biofilm dispersal activity than AEW and SAEW. SAEW disinfection of the B. cereus biofilms was due to the disruption of the B. cereus plasma membrane. The higher resistance of biofilms formed on the SS coupon might be due to the higher number of attached cells and extracellular polymeric substances formation that reacts with the active chlorine ions, such as hypochlorous acid and hypochlorite ion of SAEW, which decreased the disinfection efficacy of SAEW. This study showed that the EW treatment effectively disinfected B. cereus biofilms, providing insight into the potential use of EW in the food processing industry to control the biofilm formation of B. cereus.

scholarly journals On the role of operational dynamics in biogeochemical efficiency of a soil aquifer treatment system

2020 ◽  
Vol 24 (1) ◽  
pp. 417-426 ◽  
Author(s):  
Shany Ben Moshe ◽  
Noam Weisbrod ◽  
Felix Barquero ◽  
Jana Sallwey ◽  
Ofri Orgad ◽  
...  
Keyword(s):  
Water Quality ◽  
Large Scale ◽  
Field Measurements ◽  
Treated Wastewater ◽  
Soil Aquifer Treatment ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Flooding And Drying ◽  
Promising Solution ◽  
Sustainable Irrigation

Abstract. Sustainable irrigation with treated wastewater (TWW) is a promising solution for water scarcity in arid and semi-arid regions. Soil aquifer treatment (SAT) provides a solution for both the need for tertiary treatment and seasonal storage of wastewater. Stresses over land use and the need to control the obtained water quality makes the optimization of SAT of great importance. This study looks into the influence of SAT systems' operational dynamics (i.e., flooding and drying periods) as well as some aspects of the inflow biochemical composition on their biogeochemical state and the ultimate outflow quality. A series of four long-column experiments was conducted, aiming to examine the effect of different flooding/drying period ratios on dissolved oxygen (DO) concentrations, oxidation–reduction potential (ORP) and outflow composition. Flooding periods were kept constant at 60 min for all experiments while drying periods (DPs) were 2.5 and 4 times the duration of the flooding periods. Our results show that the longer DPs had a significant advantage over the shorter periods in terms of DO concentrations and ORP in the upper parts of the column as well as in the deeper parts, which indicates that larger volumes of the profile were able to maintain aerobic conditions. DO concentrations in the deeper parts of the column stabilized at ∼3–4 mg L−1 for the longer DPs compared to ∼1–2 mg L−1 for the shorter DPs. This advantage was also evident in outflow composition that showed significantly lower concentrations of NH4+-N, dissolved organic carbon (DOC) and total Kjeldahl nitrogen (TKN) for the longer DPs (∼0.03, ∼1.65 and ∼0.62 mg L−1 respectively) compared to the shorter DPs (∼0.5, ∼4.4 and ∼3.8 mg L−1, respectively). Comparing experimental ORP values in response to different DPs to field measurements obtained in one of the SAT ponds of the SHAFDAN, Israel, we found that despite the large-scale differences between the experimental 1-D system and the field 3-D conditions, ORP trends in response to changes in DP, qualitatively match. We conclude that longer DP not only ensure oxidizing conditions close to the surface, but also enlarge the active (oxidizing) region of the SAT. While those results still need to be verified at full scale, they suggest that SAT can be treated as a pseudo-reactor that to a great extent could be manipulated hydraulically to achieve the desired water quality while increasing the recharge volumes.

Inactivation Mechanism and Apoptotic-Like Changes in Aeromonas hydrophila Induced by Slightly Acidic Electrolyzed Water in Freshwater

2018 ◽  
Vol 61 (1) ◽  
pp. 305-314 ◽  
Author(s):  
Zhangying Ye ◽  
Shuo Wang ◽  
Weishan Gao ◽  
Songjian Nan ◽  
Songming Zhu ◽  
...  
Keyword(s):  
Membrane Permeability ◽  
Structural Damage ◽  
Suppressive Effect ◽  
Cell Membrane Permeability ◽  
Control Group ◽  
Nuclear Morphology ◽  
Electrolyzed Water ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Inactivation Mechanism

Abstract. This study investigated the suppressive effect and the inactivation mechanism of slightly acidic electrolyzed water (SAEW) on . The experiment compared different inhibition effects with SAEW and two antibiotics, gentamicin and norfloxacin. The conditions of pH of 6.5, oxidation-reduction potential (ORP) of 890 mV, available chlorine concentration (ACC) of 28 mg L-1 of SAEW, and volume ratios of 1:10, 1:15, and 1:20 were used. Using exposure times of 5 and 10 min to analyze the inactivation mechanism of SAEW from the perspectives of cell membrane permeability, cell nuclear morphology, cell fluorescence staining, and other aspects, the anti-infection effects of SAEW were tested using tilapia () culture experiments. SAEW had a stronger bacteriostasis effect than the antibiotics used. SAEW can inhibit the ability to reproduce, causing abnormal cell morphology and cell elongation. The cell volume was increased with a change in the membrane permeability. The cell nuclear morphology was changed, further inducing apoptosis. Based on study of tilapia in a control group, the organs (intestine, stomach, and liver) developed different degrees of infection. No obvious infection was observed in muscle samples. After SAEW treatment, SAEW showed a better antibacterial effect and improvement effects on the inflammation and structural damage induced by , which could be helpful in aquaculture application. Keywords: A. hydrophila, Antibiotics, Anti-infection, Cell apoptosis, Membrane permeability, Slightly acidic electrolyzed water.

scholarly journals Kinetic Modeling of Slightly Acidic Electrolyzed Water Decay Characteristics in Fresh Cabbage Disinfection Against Human Norovirus

2021 ◽  
Vol 12 ◽  
Author(s):  
Miran Kang ◽  
Boyeon Park ◽  
Ji-Hyoung Ha
Keyword(s):  
Goodness Of Fit ◽  
Information Criterion ◽  
Inactivation Kinetics ◽  
Human Norovirus ◽  
Electrolyzed Water ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Lower Akaike Information Criterion ◽  
Disinfection Process ◽  
Fresh Vegetables

To consistently disinfect fresh vegetables efficiently, the decay of disinfectants such as chlorine, electrolyzed oxidizing water (EOW), ozonated water, and plasma-activated water during the disinfection maintenance stage needs to be understood. The aim of our study was to evaluate the changes in the inactivation kinetics of slightly acidic electrolyzed water (SAEW) against human norovirus (HuNoV), based on the cabbage-to-SAEW ratio. After disinfection of fresh cabbage with disinfected SAEW solution, SAEW samples were collected and analyzed for physicochemical properties such as pH, available chlorine concentrations (ACCs), and oxidation-reduction potential (ORP). SAEW virucidal effects were evaluated. We confirmed the decay of post-disinfection SAEW solution and demonstrated the different patterns of the decay kinetic model for HuNoV GI.6 and GII.4. In addition, the goodness of fit of the tested models based on a lower Akaike information criterion, root-mean-square error (RMSE), and residual sum of squares (RSS) was close to zero. In particular, the change in both the HuNoV GI.6 and GII.4 inactivation exhibited a strong correlation with the changes in the ACC of post-disinfection SAEW. These findings demonstrate that physicochemical parameters of SAEW play a key role in influencing the kinetic behavior of changes in the disinfection efficiency of SAEW during the disinfection process. Therefore, to optimize the efficiency of SAEW, it is necessary to optimize the produce-to-SAEW ratio in future studies.

scholarly journals Electrolyzed Water and Its Application in the Food Industry

2008 ◽  
Vol 71 (9) ◽  
pp. 1934-1947 ◽  
Author(s):  
D. HRICOVA ◽  
R. STEPHAN ◽  
C. ZWEIFEL
Keyword(s):  
Reduction Potential ◽  
Food Products ◽  
Strict Adherence ◽  
Electrolyzed Water ◽  
Food Industries ◽  
Hygiene Practices ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Food Commodities ◽  
Vegetables And Fruits

Electrolyzed water (EW) is gaining popularity as a sanitizer in the food industries of many countries. By electrolysis, a dilute sodium chloride solution dissociates into acidic electrolyzed water (AEW), which has a pH of 2 to 3, an oxidation-reduction potential of >1,100 mV, and an active chlorine content of 10 to 90 ppm, and basic electrolyzed water (BEW), which has a pH of 10 to 13 and an oxidation-reduction potential of −800 to −900 mV. Vegetative cells of various bacteria in suspension were generally reduced by >6.0 log CFU/ml when AEW was used. However, AEW is a less effective bactericide on utensils, surfaces, and food products because of factors such as surface type and the presence of organic matter. Reductions of bacteria on surfaces and utensils or vegetables and fruits mainly ranged from about 2.0 to 6.0 or 1.0 to 3.5 orders of magnitude, respectively. Higher reductions were obtained for tomatoes. For chicken carcasses, pork, and fish, reductions ranged from about 0.8 to 3.0, 1.0 to 1.8, and 0.4 to 2.8 orders of magnitude, respectively. Considerable reductions were achieved with AEW on eggs. On some food commodities, treatment with BEW followed by AEW produced higher reductions than did treatment with AEW only. EW technology deserves consideration when discussing industrial sanitization of equipment and decontamination of food products. Nevertheless, decontamination treatments for food products always should be considered part of an integral food safety system. Such treatments cannot replace strict adherence to good manufacturing and hygiene practices.

Decontamination of Lettuce Using Acidic Electrolyzed Water

2001 ◽  
Vol 64 (5) ◽  
pp. 652-658 ◽  
Author(s):  
SHIGENOBU KOSEKI ◽  
KYOICHIRO YOSHIDA ◽  
SEIICHIRO ISOBE ◽  
KAZUHIKO ITOH
Keyword(s):  
Reduction Potential ◽  
Effective Means ◽  
Cellular Tissue ◽  
Coliform Bacteria ◽  
Aerobic Bacteria ◽  
Electrolyzed Water ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Alkaline Electrolyzed Water ◽  
Ozonated Water

The disinfectant effect of acidic electrolyzed water (AcEW), ozonated water, and sodium hypochlorite (NaOCl) solution on lettuce was examined. AcEW (pH 2.6; oxidation reduction potential, 1140 mV; 30 ppm of available chlorine) and NaOCl solution (150 ppm of available chlorine) reduced viable aerobes in lettuce by 2 log CFU/g within 10 min. For lettuce washed in alkaline electrolyzed water (AlEW) for 1 min and then disinfected in AcEW for 1 min, viable aerobes were reduced by 2 log CFU/g. On the other hand, ozonated water containing 5 ppm of ozone reduced viable aerobes in lettuce 1.5 log CFU/g within 10 min. It was discovered that AcEW showed a higher disinfectant effect than did ozonated water significantly at P < 0.05. It was confirmed by swabbing test that AcEW, ozonated water, and NaOCl solution removed aerobic bacteria, coliform bacteria, molds, and yeasts on the surface of lettuce. Therefore, residual microorganisms after the decontamination of lettuce were either in the inside of the cellular tissue, such as the stomata, or making biofilm on the surface of lettuce. Biofilms were observed by a scanning electron microscope on the surface of the lettuce treated with AcEW. Moreover, it was shown that the spores of bacteria on the surface were not removed by any treatment in this study. However, it was also observed that the surface structure of lettuce was not damaged by any treatment in this study. Thus, the use of AcEW for decontamination of fresh lettuce was suggested to be an effective means of controlling microorganisms.

scholarly journals Storage Stability and Disinfection Performance on Escherichia coli of Electrolyzed Seawater

Water ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 980
Author(s):  
Regina G. Damalerio ◽  
Aileen H. Orbecido ◽  
Marigold O. Uba ◽  
Patricio Elvin L. Cantiller ◽  
Arnel B. Beltran
Keyword(s):  
Escherichia Coli ◽  
Hypochlorous Acid ◽  
Storage Conditions ◽  
E Coli ◽  
Dominant Component ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Optimal Current ◽  
The Stability ◽  
Bactericidal Efficiency

The study investigated the effect of storage conditions on the stability of electrolyzed seawater (ESW)’s physicochemical properties (pH, oxidation-reduction potential (ORP), and free chlorine (FC) concentration), and bactericidal efficiency on the fecal coliform Escherichia coli for 30 days. Preliminary experiments were conducted to determine the optimal current and electrolysis time. Two batches of 2750 mL filtered seawater were electrolyzed using 50 mm × 192 mm platinum–titanium mesh electrodes at a current of 1.5 A for 20 min. One hundred milliliters of electrolyzed solution was transferred into each amber glass and high-density polyethylene (HDPE) bottles. The bottles were stored in a dark area at ambient temperature. The results showed an increase in pH and a decrease in ORP and FC concentration through time. Hypochlorous acid remained as the dominant component since the pH levels of the solutions remained below 7.5. FC decay was investigated using Chick’s Law. It was determined that the decay in HDPE bottles (k = −0.066 day−1) was faster compared to amber glass bottles (k = −0.046 day−1). Nonetheless, HDPE bottles could still be used as an alternative container for 30 days only due to observed instability beyond 30 days. ESW remained effective since no surviving population of E. coli was observed throughout the experimentation.

Sign in / Sign up

Export Citation Format

Share Document