فهرست مطالب

Iranian Journal of health, Safety and environment
Volume:2 Issue: 4, Autumn 2015

  • تاریخ انتشار: 1394/09/10
  • تعداد عناوین: 7
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  • Mohamadreza Massoudinejad, Haajar Sharifimaleksari, Amir Adibzadeh, Afsaneh Shahbazi Pages 341-347
    This study elucidates the de-colorization of phenolphthalein and phenol red from aqueous solution through electrochemical oxidation technique. An electrochemical reactor had 1 liter volume that used 2 graphite electrodes. Effect of electric power voltage, inter electrode distance and electrolyte concentration was investigated in this system. It was found that the optimum conditions for completely removal of phenolphthalein was at voltage of 48 V, retention time of 9 minutes, distance between the electrode of 5 cm, and the salt concentration of 1.5 g/l. Also completely removal of phenol red was at voltage of 48 V, retention time of 8 minutes, distance between the electrode of 5 cm, and the salt concentration of 2 g/l. Phenol red and phenolphthalein COD removal efficiency was 85 and 80 percent respectively. The results suggest that the electrolysis process is an effective way to removal of phenolphthalein and phenol red color from effluent, because of it can completely remove the color in a short time.
    Keywords: De, colorization, Electrolysis, Graphite electrodes, Phenolphthalein, Phenol red
  • Abolfazl Azhdarpoor, Zahra Mohammadi, Mansoureh Dehghani Pages 348-354
    Wastewater sludge typically contains large amounts of water and organic materials; therefore, its stabilization and dewatering is of particular importance. In this study, Fenton oxidation process is used for stabilization and dewatering of sludge in the output of a wastewater treatment plant. To evaluate the sludge stabilization and dewatering, specific resistance to filtration (SRF), volatile organic compounds (VSS), total suspended solids (TSS), soluble chemical oxygen demand (SCOD) and heterotrophic bacteria were measured. During the experiment, the optimal values of various parameters such as pH (2-9), hydrogen peroxide (0.015- 0.18mol/L), Fe2+ (0.008- 0.1mol/L) and time (5 - 60 minutes) for optimum sludge dewatering and stabilization were investigated. The results showed that the highest percentages of SRF reduction and removal rates of SCOD, VSS and TSS were 99.48, 61, 42, and 41 percent respectively. These results were obtained in optimum pH 5, 0.05 mol/l Fe2+, 0.12 mol/l hydrogen peroxide, and the retention time of 15 minutes. The removal rate of heterotrophic bacteria increased with increasing dose of hydrogen peroxide, so that a removal rate of 84 percent was observed at a dose of 0.18 mol/l. In general, Fenton process can reduce volatile organic materials and chemical oxygen demand of the sludge resulting in its significant stabilization and dewatering. In general, Fenton process can reduce volatile organic materials and chemical oxygen demand of the sludge resulting in its significant stabilization and dewatering.
    Keywords: Sludge, Fenton, stabilization, dewatering, organic materials
  • Uwem Ituen, Jacob Atser Pages 355-365
    This study examines the relationship between rural settlements characteristics and access levels to infrastructural facilities in Akwa Ibom State. A total of 50 rural settlements were randomly selected and utilized for this study. Access levels to five basic social infrastructural facilities and six variables of settlements characteristics were examined simultaneously using multivariate method of canonical correlation analysis. The question this research set to address is: along how many dimensions are the settlements characteristics related to the levels of infrastructural facilities? Five canonical functions were produced out of which the first two were found to be significant at 0.001 levels. The first canonical correlation coefficient of 0.88 (0.86 adjusted), representing 78% overlapping variance for the first pair of canonical functions or variates was obtained while the second canonical correlation coefficient was 0.59 (0.50 adjusted) and thus, represent 34% overlapping variance for the second pair of canonical variates. These canonical correlations are highly significant and represent a substantial relationship between pairs of canonical variates. The result showed that in Akwa Ibom State, rural settlements characteristics and basic social infrastructure can be related at least in two major dimensions. This study therefore reaffirms the potentials of canonical correlation analysis as a useful tool for establishing empirically based linkages between two data sets.
    Keywords: Rural Settlements, Characteristics, Infrastructural Facilities
  • Malek Hassanpour Pages 366-373
    Numerous small recycling units of plastic wastes have been currently constructed heedless to study of economic indices in Iran. Pay attention to the prominent performance of the industrial sector for economic development and its priority for fortifying other sectors to implement job opportunities, survey of the economic indices beckon the stakeholders and industries owners. The main objective of this study was a survey of economic indices in small recycling unit of plastic wastes. Therefore, the practice of computing the economic indices was performed using empirical equations, professional experiences and observations in site of the industry in terms of sustainability performance. Current study had shown the indices values such as value-added percent, profit, annual income, breakeven point, value-added, output value, data value, variable cost of good unit and production costs were found 62%, $ 366558, $ 364292.6, $ 100.34, $ 423451.25, $ 255335.75, $ 678787, $ 389.65 and $ 314494.4 respectively. The breakeven point about 15.93%, the time of return on investment about 1.12 (13.7 months) were represented that this industry slightly needs long time to afford the employed capital and starts making a profit.
    Keywords: Economic indices, Industry, Recycling, Plastic Wastes
  • Norouz Mahmodi, Mojtaba Sepandi, Amir Sheikh Mohammadi, Dr. Hossein Masoumbeigi Pages 374-379
    The most frequent way of transmission of various diseases such as HBV, HIV and HCV is exposure to sharp tools. The purpose of the study was to determine the epidemiological aspects of occupational exposure and risk factors of injuries from sharp tools among nurses in a military hospital. In this cross - sectional study 100 nursing staff in a military hospital was chosen as sample. Personal and professional information collected by a valid and reliable questionnaire, and data were analyzed using SPSS 17 software.The prevalence of occupational exposure to sharp tools of hospital waste was 41 %. Mean age and mean of experience years in nurses were 34.7 ± 5.88 and 10.99 ± 5.52 year respectively. About 63% of nurses in disaster reported the matter to the Committee on Hospital Infection Control.Most affected by the syringe needle was 46.3%. Working load and needle recapping were the main causes of the damage due to exposure to the sharp objects, 26.8 and % 31.7 respectively. The relationship between occupational exposure to hospital sharp tools and age, experience, education and place of work was significant with P= 0.006, 0.017, 0.027 and 0.008 respectively. According to the complications of sharp tools, reduction of sharp components requires regular training courses for staff, proportion of the number of work shifts, strict implementation of treatment protocols, modification of the current inaccuracy procedures, access to adequate equipment’s and safe and an effective mechanism for reporting of occupational accidents in all of the sectors.
  • Aioob Ghanbary, Ehsan Habibi, Arezou Abbaspour Darbandy Pages 380-384
    Work-related musculoskeletal disorders are the most prevalent work-related disorders and injuries and being the main cause of disability. This study was conducted to assessment of the prevalence of musculoskeletal disorders in worker company household appliances production. Posture analysis was evaluated by OWAS method and prevalence of musculoskeletal disorders by Nordic questionnaire. With evaluating musculoskeletal disorders among company household appliances production can intervention action to reduce musculoskeletal disorders was carried out. This cross-sectional study was performed on 100 workers of the appliance manufacturing industry. These Individuals were included 15 persons from foam injection workshop, 17 persons from molding workshop, 17 operators of presses, 17 persons from packaging, 17 person from cutting unit and 17 operators of rivet. The Nordic questionnaire was completed by Individuals for the organs of arm, back, leg and wrist and Posture analysis was performed by OWAS method. The data were analyzed using Spss software version 18 and descriptive statistics and Anova test. Nordic questionnaire results revealed that highest disorders were observed in the arm (25%), back (22%) and leg (21%). Also Anova test showed that was observed a significant correlation respectively between age and work experience with the prevalence of musculoskeletal disorders (p<0.02) (p<0.01). The results showed based on the level of risk OWAS for each job respectively, the highest level of risk associated with foam injection unit, packaging and cutting unit (risk level 4) and the lowest level of risk associated with molding workshop unit (risk level 2).The results of this study showed that household appliances Manufacturing workers due to the nature of their jobs are at risk of musculoskeletal disorders and Ergonomic interventions to do such as workstation redesign, reduced working hours, cycle of rest-work development.
    Keywords: Musculoskeletal Disorders, Company Household Appliances Production, OWAS Method
  • I. Alimohammadi, Farshad Nouraei, Mohammad Javad Daryalaal, Masoud Ghasemi Pages 385-402
    Tank fires are rare but carry significant potential risk to life and property. For this reason fire protection of tanks is critical. Fixed Low expansion foam and water spray cooling systems are one of the most effective and economical ways to reduce damages to a tank from fire. Such systems are currently installed in many companies but are not effective enough and require involvement of firefighters which in turn threaten their lives. This paper studies in a systematic way the problems of foam and cooling systems currently installed in a few domestic companies which operate storage tanks with focus on floating and fixed roof atmospheric tanks containing hydrocarbons and offers possible solutions for more efficient installation, design and operation of such systems.
    Keywords: Storage Tank, Cooling System, Fire Protection, Spray System, Spray System Design, Tank Fire, Problems, Foam System