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Showing 6 results for Pirsaheb
The Special Health Education Course Effects on Knowledge, Attitude and Practice of Preparation, Distribution and Sale Centers Food Staff in Kermanshah
M Pirsaheb, A Almasi, M Rezaee,
Volume 3, Issue 3 (4 2010)
Abstract

Backgrounds and Objectives:The food handling employee education program improves food safety. Determining knowledge, attitude and practice (KAP) level of workers who prepare, distribute and sale the food products make easy to control food safety. This study aimed to evaluate effects of intensive food safety education course on KAP of food handlers. in Kermanshah.
Materials andMethods: Knowledge, attitude and practice of 370workers of variety of food handling fields were studied before and after educational intervention course.Avalidated questionnaire about knowledge, attitude based on instruction from Ministry of Health and Medical Sciences for food handling was used for data collection. Paired t-test and Χ2 were applied for statistical analysis.
Results: The results showed positive effects of education program on KAP of food handlers. There was significant increase in knowledge marks before and after intervention, 20.5+ 4.03 vs. 23.73 + 3.75 (p<0.001).Attitude and practice of participants were increased significantly before 107.2+14.6 43.93+7.6 compared to after 112.23+14.5 46.11+8 intervention respectively (p<0.001). The most increased mark of KAP was belonged to 21-30 years age group.
Conclusion: Our findings confirm that educational intervention improved KAP of food handlers. To increase food safety, running periodical educational courses for the same filed workers with final exam and providing certificate highly recommended.


Economic Comparison of Standard Method with E.Jurdo Simplified Method to Measure Linear Alkyl Benzenesulfonates in Municipal Wastewater
M Pirsaheb, A Almasi, A.a Zinatizade, R Khamutian, S Delangizan,
Volume 4, Issue 2 (9 2011)
Abstract

Background and Objectives: Linear alkyl benzene sulfonates are widely used as surfactants in formulated detergent products. Because of their use in household and industrial detergents, LAS is discharged into wastewater collection systems and subsequently entered to wastewater treatment plants. Therefore, it is important to determine the concentration of LAS with accuracy. They are usually determined by standard method which is time-consuming,tedious and requires great quantities of chloroform. IN 2006 E.Jurado et al proposed a simplified method for measurement of LAS. In the present work the standard method and E.Jurado simplified method was compared economically.
Material and Methods: In this work NPV method was used for accounting the cost of initial investment, consumable material, non-consumable equipment and annual cost of staff and finally Net Present Value was calculated for them separately. The rate of interest was considered 15%.
Results: calculation showed initial investment, annual cost of staff and materials for standard method 13351981, 499968 and 1710981 RLS, respectively. And these costs for simplified method were 12048202, 83328 and 58202 RLS, respectively. Finally NPV for standard method and simplified method were equal to 30360709 and 14681848 RLS.
Conclusion: The method proposed by E.Jurdo et al is simple, time consuming and more economical than standard method .This technique can be suggested applying to the routine measurement of LAS in wastewater treatment plants.


The Efficiency of Anaerobic Wastewater Stabilization  Pond in Removing Phenol from  Kermanshah  Oil Refinery Wastewater
Ali Almasi, Meghdad Pirsaheb, Abdollah Dargahi,
Volume 5, Issue 1 (6 2012)
Abstract
MicrosoftInternetExplorer4 Background and Objectives: Phenol is one of the aromatic compounds, which due to its high toxicity and its presence in the industrial effluents, should be removed and prevented it, to the receiving water resources. The natural biological plant has been accepted as one of the most feasible, eco-friendly and cost-effective options for the treatment of pollutants such as Phenol. The aim of this study is efficiency evaluation of the anaerobic stabilization pond performance in removing phenol and other organic compounds from Kermanshah oil refinery wastewater.
Materials and Methods: The method of study was experimental and analytical, a laboratory scale anaerobic stabilization pond, with dimensions of 1 × 1 × 0/2 m, using fiberglass sheet with a thickness of 6 mm was designed and built up. In this study The hydraulic retention time and hydraulic loading rate were expected 2 days and 95 liters per day respectively. Organic loading rate for anaerobic pond was 100 g/m3. After starting, seeding and biological stability, samples were taken. Initial phenol concentration was added about of 100 mg/l to pilot input, then the parameters such as NH3, PO4 and Phenol were measured by Varian spectrophotometer model UV-120-02 in the wavelength 425, 690, 500 nm respectively.  TCOD, SCOD, TBOD, SBOD, pH and ORP were measured according to the standard methods of water and wastewater.
Results: The results showed that the removal efficiency of NH3, PO4, phenol, TCOD, SCOD, TBOD, SBOD in the anaerobic pond were obtained 91.51%, 64.34%, 89.82% 74.99 % 73.34% 71.75%, 68.9% respectively.
Conclusion: The results showed that the ability for phenol and other organic compounds removal in anaerobic pond using petroleum refinery wastewater is higher than the other systems which are expensive and complex.

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Performance of Granular Activated Carbon to  2,4-Dichlorophenoxy Acetic Acid  Aemoval from Aqueous Environments 
Meghdad Pirsaheb, Kiumars Sharafi, Abdollah Dargahi,
Volume 5, Issue 1 (6 2012)
Abstract
MicrosoftInternetExplorer4 Background and Objectives: 2, 4-dichlorophenoxy acetic acid is a well-known herbicide which can be dangerous for  both human and animal health in different ways such as its presence in drinking water. This study aimed at Performance of granular activated carbon to 2-4-D removal from aqueous solution and assessing the relationship between COD and 2-4-D concentration
Materials and Methods: This study is a lab-scale study. Firstly, different 2-4-D concentrations were prepared from Stock solution (1000 mg/L), and then their CODs were measured. Optimum pH for 2-4-D removal was determined and its absorption rate at different concentrations was measured.
Results: Results showed a clear relationship between COD and 2-4-D concentration. On the other hand, COD removal increased as time elapsed, so that maximum removal 90% and 84% at initial 2-4-D concentrations of 50 and 100 mg/L were observed at contact time of 50 min respectively. Optimum pH for all concentrations was determined as 6.
Conclusion: According to present study it can be concluded that activated carbon have be up to 90% of 2-4-D removal from water environment. In addition, a significant relationship was observed between COD and 2-4-D concentration, so that direct measurement of COD can be used instead of 2-4-D measurement.


Evaluation of stability and maturity indices during composting process from a mixture of poultry waste and sawdust by windrow method
Asghar Yavari, Mehdi Moradi Nazar, Seyedeh Maryam Sharafi, Amir Hossein Nafez, Meghdad Pirsaheb,
Volume 15, Issue 1 (4-2022)
Abstract
Background and Objective: It is important to determine the quality of the compost to use compost properly. The aim of this study was to determine the effect of mixing ratio of bulking agent on stability and maturity indices in poultry waste compost.
Materials and Methods: Two piles of sawdust mixture with poultry wastes and volume ratios of 1:1 (W1) and 2:1 (W2) were prepared by Windrow method and a pile containing poultry manure was used as control (W0). In order to determine the stability and maturity indices in compost, the most important physicochemical and biological parameters were studied.
Results: The thermophilic phase lasted about 7 weeks for W1 and about 4 weeks for W2. The initial C/N ratios in the W0, W1 and W2 were 27.10, 31.40 and 56.24, respectively, which eventually reached less than 20. The reduction of organic matter in the three piles was 8.30%, 62.59% and 85.53%, respectively. The thermophilic phase caused a sharp decrease in the population of indicator and pathogenic microorganisms in all piles. The highest dehydrogenase activity in W1 pile was 2.95 mgTPF/gDW.h and by decreasing temperature until the last day, its value decreased to 0.29 mgTPF/gDW.h.
Conclusion: The best ratio for mixing sawdust with poultry manure was 1:1 (v:v). Microbial and enzymatic activities are useful parameters for monitoring poultry composting process and determining the rate of compost stability, and the use of this compost in agriculture will improve soil quality.
 

Gaseous toluene removal by pine-cone/compost biofilter: setup, performance, and optimization
Zohreh Naderi, Hiwa Hossaini, Meghdad Pirsaheb, Akbar Barzegar, Sara Kianpour,
Volume 15, Issue 3 (12-2022)
Abstract
Background and Objective: Toluene is one of the most important volatile organic compounds that threaten human health and introduce many environmental problems. Therefore, the present study aims to determine the performance of a biofilter based on pine cones/compost to remove toluene vapors from polluted air streams.
Materials and Methods: In this research, a biofilter with a volume of 19.468 L was designed and built. The biofilter bed consisted of two parts 26 cm in height and packed with a mixture of compost and pine cones in 1:1 volumetric ratio. After inoculating the bed with sludge from a municipal wastewater treatment plant and making it compatible with toluene, the performance of the biofilter in different parts of the bed was investigated at the inlet toluene concentrations of 2.5-5.5 g/m3 and Empty Bed Retention Times (EBRTs) of 1.3, 1.7, and 2.43 min. Also, the results were analyzed statistically.
Results: At EBRT of 2.43 min and different inlet toluene concentrations of 2.5-5.5 g/m3, the removal efficiency reached 100 percent. Also, the removal efficiency decreased with the reduction of EBRT. The results showed that removal efficiency was higher in the first part of the biofilter bed relate to the second part. At an inlet toluene concentration of 2.62 g/m3 and EBRT of 1.7 min, the maximum elimination capacity (ECmax) of 2.74 g/m3.min was obtained.
Conclusion: In all experimental conditions the outlet concentration of pine-cone/compost biofilter was below the WHO standard (260 µg/m3). Also, the high elimination capacity of biofilter verified its capability toward toluene removal from polluted gas streams.

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