Batoul Zarif Gharaati Oftadeh; Najmeh Afsharkohan; Mohammad Zanguoe; Mohammad Rashidi; Reza Barati; Sedigheh Majidian; Ali Akbar Dehghan
Abstract
Background and purpose: The COVID-19 pandemic swiftly swept across the globe as an infectious disease months after its initial reports. This study aims to identify the factors influencing employees’ adherence to health protocols using the health belief model within the Khorasan Razavi Regional ...
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Background and purpose: The COVID-19 pandemic swiftly swept across the globe as an infectious disease months after its initial reports. This study aims to identify the factors influencing employees’ adherence to health protocols using the health belief model within the Khorasan Razavi Regional Water Company context.Materials and Methods:In 2019, a descriptive-analytical (cross-sectional) investigation involved 65 Khorasan Razavi Regional Water Company employees. The data collection process involved a meticulously designed questionnaire fashioned by the researcher. This questionnaire encompassed 11, 24, and 18 inquiries about employees’ knowledge, attitudes, and practices. The responses were collected through an online survey platform, followed by meticulous analysis through the employment of SPSS software.Results: : Examination of the interplay between demographic variables and knowledge, attitudes, and behavior constructs revealed that mean scores for knowledge, attitudes, and behaviors did not display any significant variance amongst gender, educational, or occupational categories (p<0.05). Intriguingly, a significant positive correlation emerged between awareness and attitudes (p<0.01), as well as between awareness and behaviors (p=0.02). Other variables exhibited negligible correlation (p <0.05). Furthermore, the outcomes demonstrated that the structure of awareness significantlyimpacted the studied individuals’ behaviors (p =0.01). Employees’ knowledge and attitudes about coronavirus prevention exhibited a commendable standard.Conclusion: This study underscores the pivotal role of employee knowledge and attitudes in shaping their adherence to COVID-19 prevention practices. Consequently, it is recommended that educational initiatives be introduced as potent tools for augmenting the knowledge and attitudes of Khorasan Razavi Regional Water Company personnel.
Mohammad Javad Chaboki; Ali Asghar Najafpoor; Ziaeddin Bonyadi; Ali Akbar Dehghan
Abstract
Background:Human activities, especially in construction and agriculture, introduce large amounts of nitrogen, phosphorus and organic matter into aquatic ecosystems. Method: In this study, municipal and industrial wastewater samples were obtained from wastewater treatment plant No. 1 of Parkand Abad and ...
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Background:Human activities, especially in construction and agriculture, introduce large amounts of nitrogen, phosphorus and organic matter into aquatic ecosystems. Method: In this study, municipal and industrial wastewater samples were obtained from wastewater treatment plant No. 1 of Parkand Abad and wastewater treatment plant of Kalat industrial park, respectively. Before starting the reactor, wastewater samples were allowed to settle for 2 h to remove coarse suspended solids and then sterilizes in autoclave. Chlorella vulgaris was purchased from Jahad Daneshgahi of Mashhad and grown in specific culture media under temperature 25±2°C, photoperiod of 14 h light and 10 h dark, monochrome light with intensity of 5000±350 lux, pH of 7-8.5 and time of 10 d. Then 1 L of the above solution were transferred to three 10 L reactors loaded with municipal, industrial and culture media and aerated under sterile conditions in the presence of light for 10 d. In predetermined time intervals (each 2 d), 100 mL sample were taken from reactors and COD, total phosphorous, total nitrogen, pH and chlorophyll a measured. Results: Removal efficiency of COD, total nitrogen, and phosphorus in municipal, industrial and culture media by Chlorella vulgaris was 63.69, 12.52, and 13.79%, 66.57, 34, and 50.18%, respectively. According to results, the efficacy of algae for removal of COD was higher than other parameters, while that for total nitrogen was lowest. Efficacy of algae for removing pollutants from industrial was better than those in domestic wastewater.Conclusion:The results of this study showed that municipal and industrial media could be a suitable culture media for growing Chlorella vulgaris algae. It also has the ability to remove nutrients from wastewaters.
Mojtaba Afsharnia; Aliakbar Dehghan; Hosein Alidadi; Najmeh Afsharkohan; Sedigheh Majidian
Abstract
Abstract Background & Aim: The colored waste from the textile industry is one of the most pollutants in the aquatic environment. One of the most widely used paints in the textile industry is methylene blue, which is often aromatic, often toxic, carcinogenic, mutated and resistant to biological ...
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Abstract Background & Aim: The colored waste from the textile industry is one of the most pollutants in the aquatic environment. One of the most widely used paints in the textile industry is methylene blue, which is often aromatic, often toxic, carcinogenic, mutated and resistant to biological degradation and has harmful effects on living organisms. The purpose of this study was to investigate the bismuth oxyiodide nanoparticles capability to absorb methylene blue from synthetic wastewater. Materials &methods: The present study was carried out in a laboratory scale in batch mode. The effects of variables affecting the process including pH, adsorbent dose, contact time and initial concentration of color, kinetic and adsorption isotherm were investigated. Results: The maximum removal efficiency of methylene blue from solutions was observed in optimal conditions as pH of 9, contact time of 30 minutes, absorbance dose of 3 g/L and initial concentration of 10 mg/L. Methylene blue adsorption compliance by BiOI from a pseudo-second kinetic model and Langmuir isotherm model shows that the type of reaction is chemical absorption. Conclusion: The results of the experiments showed that bismuth oxide has a high potential for removal of methylene blue molecules from contaminated wastewater.
Ali Pakfetrat; Ali Sajjadi; Aliakbar Dehghan
Abstract
ABSTRACT
Background & Objectives: At present, one of the most important environmental issues is dental solid wastes due to its high contents of toxic, pathogen and hazardous agents. The aim of this study was to analyze the quantity and quality of dental solid waste in dental centers of Mashhad.
Materials ...
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ABSTRACT
Background & Objectives: At present, one of the most important environmental issues is dental solid wastes due to its high contents of toxic, pathogen and hazardous agents. The aim of this study was to analyze the quantity and quality of dental solid waste in dental centers of Mashhad.
Materials & Methods:In this descriptive study, 40 dental centers were studied. From each dental center, three samples were taken and analyzed at the successive working days (Sunday, Monday and Tuesday). The samples were manually sorted into 64 different components and measured by digital scale. Then, measured components were classified on the basis of characteristic and hazardous potential as well as material type. Obtained data were analyzed using a descriptive statistics software, SPSS 16.
Results:According to the results, total produced wastes in dental centers in Mashhad were 224.137 kg/day. Per capita and the average generation rate of each dental center were 106.32 g/day-patient and 5603 g/day, respectively. Potential infectious, domestic-type, chemical & pharmaceutical, and toxic wastes consisted of 41.24, 44.17, 9.89, and 4.7% of the generated waste, respectively.
Conclusion: Regarding optimal dental waste management, it is suggested that education of dentists should be done to learn waste reduction, separation and recycling in the offices along with separately collection and disposal of separated fractions of dental solid wastes according to the enacted instructions.
Keywords: Dental solid waste, Potential infectious waste, Domestic-type waste, Chemical &pharmaceutical waste, Mashhad.
Ali Asghar Najafpoor; omid nemati sani; hosein alidadi; aliakbar dehghan; Saeed Azarmi Moheb Seraj
Abstract
Introduction: Ciprofloxacin is one of the most important synthetic antibiotics from the fluoroquinolone group and is widely used in medicine and veterinary medicine. The presence of fluorine atom in its composition has made stability and Sustainability. Recently, ozone is used for wastewater treatment, ...
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Introduction: Ciprofloxacin is one of the most important synthetic antibiotics from the fluoroquinolone group and is widely used in medicine and veterinary medicine. The presence of fluorine atom in its composition has made stability and Sustainability. Recently, ozone is used for wastewater treatment, odor control and removal of persistent organic compounds. Ozone acts through direct oxidation or the mechanisms of chain reactions that result in the release of hydroxyl radicals. Goal: The aim of this study was to determine the efficiency of ciprofloxacin removal by ozonation process from aqueous solutions. Material and methods: In this study, at first, concentrations of produced ozone of generator were determined by iodometric method. The studied parameters in the process includingciprofloxacin concentrations of 10-50 mg/L, pH of 3-12, a reaction time of 60 min and an ozone concentration of 1.4 mg/lit.min was investigated in a semiconductor reactor. The remained concentrations of ciprofloxacin in the samples were measured by HPLC. Results: In the optimal condition, at pH: 12, O3: 1.4 gr/lit.min, and initial antibiotic concentration of 10 mg/L, 94.6% of ciprofloxacin was removed. Conclusion: The results showed that ozonation can be a suitable method for removal of ciprofloxacin antibiotic from aqueous solutions.
Mohsen Yazdani; Ali Asghar Najafpoor; Ali Akbar Dehghan; Hossein Alidadi; mahmood dankoob; Reyhane Zangi; Sima Nourbakhsh; Reza Ataei; Ali Asghar Navaei fezabady
Abstract
Background and objectives: Tetracycline is known as the second high consumed groups of antibiotics throughout the world, which their entrance into the domestic wastewater will lead to pollute the water resources. The aim of this study was to determine the performance of combined Ultrasonic/UVprocess ...
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Background and objectives: Tetracycline is known as the second high consumed groups of antibiotics throughout the world, which their entrance into the domestic wastewater will lead to pollute the water resources. The aim of this study was to determine the performance of combined Ultrasonic/UVprocess in removal of tetracycline antibiotic from aqueous environments. Material and methods: This experimental study was performed by the ultrasonic bath associated with ultraviolet radiation. To determine the effects of independent variables including contact time (5-60 min), initial antibiotic concentration (5-25 mg/l), pH (3-10) and the input power (100- 300 W) on response variable (tetracycline removal), the samples were taken from reactor in different time intervals and the residual concentrations of tetracycline were measured by spectrophotometer in 261 nm wavelength. Results: The results of this study showed that the removal efficiency of UV and Ultrasonic processes was16% and 32% in optimum conditions, respectively. While in Ultrasonic /UV process, removal efficiency increased. The best removal efficiency (72%) was observed in pHof 4.5, antibiotic concentrationof10 mg/I, input power of240 W and contact timeof50 min. Conclusion: According to the obtained results, Ultrasonic/UVprocess can be used as an effective process to remove the tetracycline antibiotic from aqueous solutions.