scholarly journals Using Sodium Hypochlorite as the Main Disinfectant in the Swimming Pool of National Technical University Sports Complex

2021 ◽  
Vol 6 (1) ◽  
pp. 168-172
Author(s):  
K. V. Solomakha ◽  
◽  
S. I. Harkavyi
Keyword(s):  
Sodium Hypochlorite ◽  
Leisure Activities ◽  
Statistical Processing ◽  
Short Review ◽  
Swimming Pool ◽  
Swimming Pools ◽  
Advantages And Disadvantages ◽  
National Technical ◽  
Significant Difference ◽  
Technical University

This article is about the importance of sanitary and hygienic examination of water complexes, in particular, swimming pools and water parks. There is an increasing demand for visiting such water complexes in Ukraine, both for sports activities and for leisure activities. The focus of this article is on the sanitary and hygienic examination and survey of pool water, which is treated with sodium hypochlorite (obtained by chemical way). Material and methods. The studies were carried out for 10 weeks, including a series of water samples, which were taken during the quarantine period, when swimmers were prohibited from visiting the pool. This situation made possible to make a comparative hygienic assessment of the effect of workload on the water condition in the pool and the effectiveness of disinfection. There was also a short review and characteristics of hypochlorite A, which was obtained in chemical way, its advantages and disadvantages as a disinfectant. The article analyzes the data obtained during the sanitary and hygienic survey of the pool of the swimming pool of the national technical university, their statistical processing, and comparison with the current regulatory documents of Ukraine and some other states. The data obtained in the course of a series of studies indicated a significant human influence on the state of water in the pool, which once again indicates the importance of health education of the population and visitors in swimming pools and water parks, in particular, the need to take a shower before swimming, after using the toilet, etc.; the need for training the right culture of visiting different water objects. Particular attention should be paid to swimming pools frequented by children, as they often do not have sufficient hygiene skills, or due to age cannot constantly monitor urination, so, as a rule, it`s an acute issue of large amounts of chloramines in swimming pools for children. Conclusion. In particular, a statistically significant difference was obtained in terms of ammonia and ammonium ions (in total), which indicated a significant influence of visitors on this parameter. And, as you know, organic impurities (sweat, urine, cosmetics remains etc.) that get into the water together with the swimmers, react with chlorine and form chloramines, which can negatively affect the health of both the visitors and the staff. This must be taken into account while changing the workload on the pool and choosing the dose of disinfectant

scholarly journals Formation of trihalomethanes in swimming pool waters using sodium dichloroisocyanurate as an alternative disinfectant

2018 ◽  
Vol 78 (8) ◽  
pp. 1633-1641
Author(s):  
Yuanxiang Mao ◽  
Liping Zhang ◽  
Huiyu Dong
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Sodium Hypochlorite ◽  
Swimming Pool ◽  
Microbial Pathogens ◽  
Swimming Pools ◽  
Disinfection Methods ◽  
Factors Influencing ◽  
Sodium Dichloroisocyanurate ◽  
Swimming Pool Water

Abstract Disinfection is essential to preventing infection caused by microbial pathogens in swimming pool water. The most commonly used disinfection methods are chlorine disinfectant, including sodium hypochlorite (NaOCl) and sodium dichloroisocyanurate (SDIC, C3O3N3Cl2Na) with characteristics of available chlorine formation and stability. In this study, we estimate the formation of trihalomethanes (THM4) in indoor swimming pools filled with seawater that adopt these disinfection methods, and we investigated the factors influencing the formation of THM4. Formation of THM4 by free chlorine (FC) and SDIC respectively is 327.8 μg L−1 and 307.6 μg L−1; Br-THMs is 226.7 μg L−1 for FC, 198 μg L−1 for SDIC. SDIC has less THM4 formation than FC in the same molar Br− dosage (10 μM) and total chlorine dosage (20 μM), and bromoform is the main Br-THMs species. The occurrence of THM4 is inhibited at high dosages of natural organic matter and Br−. The total Br-THMs increase from 75 μg L−1 to 189.7 μg L−1 and from 64.6 μg L−1 to 190 μg L−1 by FC and SDIC at pH 5.0–9.0, both of which are highly dependent on pH. In real water, similar results were found in Br−-containing water (1 mg-Br− L−1).

scholarly journals The effectiveness of ozone-chlorine treatment for reducing chloramine concentration compared to chlorine treatment in swimming pools and whirlpools

2014 ◽  
Author(s):  
Derrick Mah ◽  
BCIT School of Health Sciences, Environmental Health ◽  
Helen Heacock
Keyword(s):  
Swimming Pool ◽  
Ozone Treatment ◽  
Concentration Limit ◽  
Upper Respiratory Tract ◽  
Swimming Pools ◽  
Chlorine Disinfection ◽  
Two Samples ◽  
Significant Difference ◽  
Analysis System ◽  
By Products

  Objectives: Chloramines are by-products of chlorine disinfected swimming pools and are hazardous to people if chloramines evaporate into the air. There is evidence that chloramines cause upper respiratory tract and eye irritation. It was suspected that ozone treatment in addition to chlorine disinfection will reduce chloramine levels in the pool. The following study compared chloramine concentration in a strictly chlorine disinfected swimming pool and whirlpool (C.G. Brown) in Burnaby, BC with an ozone-chlorine disinfected swimming pool and whirlpool (Killarney) in Vancouver, BC. The study also compared each pool and whirlpool to the 1.0 mg/L combined chlorine concentration limit in the B.C. Pool Regulation. Methods: Chloramine concentrations were determined by using a Hach Pocket Colorimeter 2 Analysis System which used a DPD method of analysis. Chloramine was determined by subtracting total chlorine by the free chlorine. Thirty pool water samples were analyzed based on two samples per pool per day for fifteen days. A two sample t-test was used to compare the ozone-chlorine treated pools with the chlorine only treated pools using the Mann-Whitney U test. A z-test was used to compare all types of swimming pools and whirlpools to the 1.0 mg/L limit. Results: The chloramine concentration in both the ozone-chlorine disinfected swimming pool and whirlpool was not statistically significantly lower than in the chlorine disinfected swimming pool (p=0.263597) and whirlpool (p=0.523672). Both types of swimming pools were found to be statistically significantly greater than the 1.0 mg/L chloramine limit (p=0.000023 in the chlorine pool and p=0.00001 for the ozone-chlorine pool). Similarly, both types of whirlpools were determined to be statistically significantly greater than the 1.0 mg/L chloramine limit (p=0.000001 for the chlorine pool and p=0.000001 for the ozone-chlorine pool). Conclusion: It was determined that there was no difference between ozone chlorine treated pools and chlorine only treated pools. Environmental Health Officers can suggest other forms of secondary treatment instead of ozone since there is no significant difference compared to chlorine only treated pools in reducing chloramine concentrations. This information is also beneficial for pool operators because they can increase their flow rates for pools that use ozonation or strictly chlorination relative to what they were originally designed for.  

scholarly journals Evaluating if airborne chemical levels in indoor swimming pools are influenced by type of water treatment

2020 ◽  
Vol 63 (2) ◽  
pp. 48-53
Author(s):  
Khayati Patel ◽  
Chun-Yip Hon
Keyword(s):  
Water Treatment ◽  
Ultra Violet ◽  
Sampling Period ◽  
Swimming Pool ◽  
Chemical Concentration ◽  
Swimming Pools ◽  
Indoor Space ◽  
Pool Water ◽  
Airborne Concentration ◽  
Significant Difference

Introduction Airborne chemical contaminants within an indoor space have the potential to cause adverse effects on those who work or visit the building. Indoor pools are no exception and airborne contaminants arise when chemicals, used for disinfection purposes, react with the pool water. Pool water can be treated by different means (e.g., chlorination or ultra-violet (UV) radiation) and whether the type of water treatment affects the airborne chemical levels is unclear. This study examined UV-treated vs. chlorine-treated swimming pools to determine if there is a difference in the resulting airborne chemical concentration of chlorine, hydrochloric acid (HCl) and trichloramines. Methods Two swimming pools (one UV-treated and one chlorine-treated) were selected to participate based upon the inclusion criteria. Partial period sampling was conducted on 3 different days at each facility when swim classes were occurring. For each sampling period, two ambient samples for each analyte (chlorine, HCl, and trichloramines) were collected according to recognized occupational hygiene protocols. Additionally, the temperature and relative humidity were measured, and other pool chemistry information was obtained. Comparative analyses were performed to ascertain if there was a difference in airborne chemical levels between the two pools. Results Summary statistics indicated very similar averages for each of the three airborne chemicals between the two water treatment types. A two-sample t-test found that the difference in means was not statistically significant for any of the three analytes. Conclusion There was no statistically significant difference reported in the mean airborne concentration for any of the analytes between the chlorine-treated swimming pool and the UV-treated swimming pool. In addition, all airborne chemical concentration levels were below their respective occupational exposure limit or recommended guideline level. The type of water treatment does not appear to impact the airborne chemical levels though further research is suggested to confirm these results.

Comparative Study to Evaluate the Surface Detail Reproduction of Dental Stone after Immersion in Various Different Disinfectant Solutions, Under Stereomicroscope 10 X Magnification –An In-Vitro Study

2017 ◽  
Vol 9 (3) ◽  
Author(s):  
Rathika Rai ◽  
M. A. Easwaran ◽  
K. T. Dhivya
Keyword(s):  
Sodium Hypochlorite ◽  
In Vitro Study ◽  
Control Group ◽  
Immersion Method ◽  
Significant Difference ◽  
Surface Irregularities ◽  
Disinfectant Solution ◽  
Surface Detail ◽  
Group B

Aim: To evaluate the surface detail reproduction of dental stone this is immersed in different disinfectant solution and studied under stereomicroscope. Methodology: Total number of 30 specimens of dental stone (Type III) were made with measurements of 1.5cm diameter and 1cm height .This samples are divided in to 3 groups group A,B,C. were A is immersed in Distilled water which was taken as control group ;B is immersed in 2% Glutaraldehyde and C is immersed in 5%sodium hypochlorite. Each specimen were immersed in the disinfectant solution for 15 minutes and dried under room temperature for 24 hrs. After 24 hrs each specimens are studied under stereomicroscope for surface details. Result: The results showed no significant difference in the surface irregularities and porosities for a group 1 and group 2 except group 3 which showed significant increase in the porosities, surface irregularities and erosions after disinfection with 5% NaHOCl by immersion method. Conclusion: The surface detail reproduction capacity of die stone was adversely affected when 5% Sodium hypochlorite was used as disinfectant solution when compare d to control group and 2% Glutaraldehyde

scholarly journals Metacarpal shaft fixation: a biomechanical comparison of dorsal plating, lag screws, and headless compression screws

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Felix G. E. Dyrna ◽  
Daniel M. Avery ◽  
Ryu Yoshida ◽  
David Lam ◽  
Simon Oeckenpöhler ◽  
...  
Keyword(s):  
Peak Load ◽  
Rigid Fixation ◽  
Advantages And Disadvantages ◽  
Shaft Fractures ◽  
Metacarpal Shaft ◽  
Significant Difference ◽  
Load To Failure ◽  
Headless Compression Screws ◽  
Diaphyseal Fractures ◽  
Dorsal Plating

Abstract Background Metacarpal shaft fractures are common and can be treated nonoperatively. Shortening, angulation, and rotational deformity are indications for surgical treatment. Various forms of treatment with advantages and disadvantages have been documented. The purpose of the study was to determine the stability of fracture fixation with intramedullary headless compression screws in two types of metacarpal shaft fractures and compare them to other common forms of rigid fixation: dorsal plating and lag screw fixation. It was hypothesized that headless compression screws would demonstrate a biomechanical stronger construct. Methods Five matched paired hands (age 60.9 ± 4.6 years), utilizing non-thumb metacarpals, were used for comparative fixation in two fracture types created by an osteotomy. In transverse diaphyseal fractures, fixation by headless compression screws (n = 7) and plating (n = 8) were compared. In long oblique diaphyseal fractures, headless compression screws (n = 8) were compared with plating (n = 8) and lag screws (n = 7). Testing was performed using an MTS frame producing an apex dorsal, three point bending force. Peak load to failure and stiffness were calculated from the load-displacement curve generated. Results For transverse fractures, headless compression screws had a significantly higher stiffness and peak load to failure, means 249.4 N/mm and 584.8 N, than plates, means 129.02 N/mm and 303.9 N (both p < 0.001). For long oblique fractures, stiffness and peak load to failure for headless compression screws were means 209 N/mm and 758.4 N, for plates 258.7 N/mm and 518.5 N, and for lag screws 172.18 N/mm and 234.11 N. There was significance in peak load to failure for headless compression screws vs plates (p = 0.023), headless compression screws vs lag screws (p < 0.001), and plates vs lag screws (p = 0.009). There was no significant difference in stiffness between groups. Conclusion Intramedullary fixation of diaphyseal metacarpal fractures with a headless compression screw provides excellent biomechanical stability. Coupled with lower risks for adverse effects, headless compression screws may be a preferable option for those requiring rapid return to sport or work. Level of evidence Basic Science Study, Biomechanics.

The Effect of Bleach Liquid and Household Cleaner on Surface Hardness and Roughness of Acrylic Base of Orthodontic Appliances

2021 ◽  
Author(s):  
Saeed Noorollahian ◽  
Farinaz Shirban ◽  
Vahid Mojiri
Keyword(s):  
Surface Roughness ◽  
Hydrochloric Acid ◽  
Sodium Hypochlorite ◽  
Surface Hardness ◽  
Acrylic Resin ◽  
Liquid Sodium ◽  
P Value ◽  
Orthodontic Appliances ◽  
Acrylic Resins ◽  
Significant Difference

Introduction: The daily use of orthodontic removable plates can interfere with the self-cleansing function of the mouth. Although various techniques have been proposed for cleaning removable orthodontic appliances, there is no consensus on the use of a safe method that preserves the physical properties of the appliance. This study aimed to investigate the effect of using hydrochloric acid (10%, for removal of mineral deposits) and sodium hypochlorite (5.25%, to remove organic matter and discolorations) on surface hardness and roughness of self-cure orthodontic acrylic resins. Materials & Methods: This cross-sectional laboratory study was conducted in the fall of 2017 at Isfahan University of Medical science and Isfahan University of Technology. In this study two orthodontic acrylic resins (Orthocryl® and Acropars®) were used. Eighty samples (12×10×3 mm) from each one were fabricated and divided into four groups (n = 20). Group 1: 15 minutes immersion in household cleaner liquid (Hydrochloric acid, 10%) followed by15 minutes immersion in household bleach liquid (Sodium Hypochlorite, 5.25%). In group 2, immersions were repeated just like group two times and in group 3, were done three times. Group 4 was as control and had no immersion. The surface hardness and roughness of samples were measured. Data were analyzed with Two Way ANOVA and the significance level was set at 0.05. Results: The number of immersion procedures did not significantly affect the surface hardness (p value = 0.958) and surface roughness (p value = 0.657) in the different study groups. There was no significant difference in the surface hardness between the two acrylic resin brands (p value = 0.077); however, Acropars acrylic resin samples exhibited significantly higher surface roughness compared to the Orthocryl acrylic resin samples(p value < 0.001). Conclusion: 15 minutes of immersion in 10% HCl, followed by 15 minutes of immersion in 5.25% NaOCl and repetition of the procedure three times did not significantly affect the surface hardness and roughness of self-cured acrylic resins.

scholarly journals Changes in Caregivers Lifestyle after Severe Acquired Brain Injury: A Preliminary Investigation

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
M. D’Ippolito ◽  
M. Aloisi ◽  
E. Azicnuda ◽  
D. Silvestro ◽  
M. Giustini ◽  
...  
Keyword(s):  
Brain Injury ◽  
Preliminary Investigation ◽  
Leisure Activities ◽  
Primary Caregivers ◽  
Acquired Brain Injury ◽  
Lifestyle Changes ◽  
Self Report ◽  
Severe Acquired Brain Injury ◽  
Significant Difference ◽  
Additional Support

Introduction. Severe acquired brain injury (sABI) is considered the most common cause of death and disability worldwide. sABI patients are supported by their caregivers who often exhibit high rates of psychological distress, mood disorders, and changes in relationship dynamics and family roles.Objectives. To explore lifestyle changes of caregivers of sABI patients during the postacute rehabilitation, by investigating possible differences between primary and secondary caregivers. Primary caregivers spend most of the time with the patient, providing daily care and taking most responsibility for the day-to-day decisions, while secondary caregivers are those who provide additional support.Methods. Three hundred forty-seven caregivers of sABI patients were asked to fill in an unpublished self-report questionnaire to explore their possible lifestyles changes.Results. A statistically significant difference was found between primary and secondary caregivers in time spent in informal caregiving (p<0.001). The primary caregivers reduced all leisure activities compared to secondary carers (p<0.05).Conclusions. By comparing the percentage of leisure activities performed by caregiversbeforeandafterthe patient’s sABI onset, all caregivers showed high percentages of changes in lifestyle and habits, even though primary caregivers reported more negative lifestyle changes than secondary caregivers. Further studies are needed to investigate needs and burden experienced by caregivers of sABI patients during the postacute rehabilitation phase, also in relation to the patients’ outcome, to address support interventions for them and improve their quality of life.

The database group at National Technical University of Athens (NTUA)

1995 ◽  
Vol 24 (4) ◽  
pp. 78-83
Author(s):  
CORPORATE National Technical Univ. of Athens
Keyword(s):  
National Technical ◽  
Technical University
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