Leila Rezaei; Vali Alipour; Amir Hesam Hassani; Mohsen Dehghani
Abstract
Background: the Persian Gulf ecosystem is facing degradation, so further degradation must be prevented. The present study was conducted to assess the environmental pollution risk potential of the coastal ecosystem due to heavy metal content in desalination plant’s effluent.Methods: In this cross-sectional ...
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Background: the Persian Gulf ecosystem is facing degradation, so further degradation must be prevented. The present study was conducted to assess the environmental pollution risk potential of the coastal ecosystem due to heavy metal content in desalination plant’s effluent.Methods: In this cross-sectional study, the researchers selected five stations in the west of Bandar Abbas beach, located at the outlet of desalination effluent canals to the shore, and two stations in the east shore (without effluent discharge) as case and control stations, respectively. The researchers collected 51 Sediment samples and measured heavy metal concentration, using an AA spectrophotometer, and assessed the potential ecological risk. They used SPSS software and the T-test to statistically analyze data.Results: The concentration means for sediments in case and control stations samples were: 40.63±16.79, 96.64±30.60, 159.74±50.65, 109.22±17.09, 205.35±86.96 mg.kg-1 and 40.15±17.21, 79.16±28.26, 152.43±90.07, 101.82±43.55, and 193.82±112.90 mg.kg-1, respectively for (Pb, Cu, Ni, Cd, and Zn). The ecological risk and Pollution Load Index were (31.72, 35.95, 3.30, 36.96, and 45.61) and (0.62, 0.63, 0.71, 0.68, and 0.9), respectively for metals mentioned order. Individual potential risk for all stations showed a low-risk degree.Conclusion: Although the heavy metals accumulated in coastal sediments due to the discharge of desalination plant effluents, severe ecological and environmental damage has not occurred. Therefore, there is still time to prevent an environmental catastrophe on the shores receiving desalination effluents. Therefore, it is recommended to all responsible persons to take the necessary measures to monitor and control the plan and reduce the discharge of effluents to the shores.
Mohsen Dehghani; Fatemeh Mosaferi; Vali Alipour
Volume 4, Issue 3 , July 2016, , Pages 106-110
Abstract
Background: Given that the share of imported rice from India and Pakistan, the current study was conducted to determine the concentration of lead, arsenic and cadmium in the rice imported from the two mentioned countries in comparison to Iranian rice. Methods: This cross-sectional study was conducted ...
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Background: Given that the share of imported rice from India and Pakistan, the current study was conducted to determine the concentration of lead, arsenic and cadmium in the rice imported from the two mentioned countries in comparison to Iranian rice. Methods: This cross-sectional study was conducted in 2014 in Bandar Abbas, using a completely randomized block design. Five samples of each brand (India,Pakistan and Iran) and a total of 75 samples were selected. To measure the amount of arsenic in them, atomic spectrum poll and to determine the amount of lead and cadmium, the graphite furnace atomic absorption spectrometer optical-compliant were used. To analyze the data, we applied descriptive statistics and analysis of variance using SPSS software. Results: The mean of Cd, As and Pb were 0.045, 0.057, and 0.022 mg/kg, respectively. There was a significant difference for Cd in the local and imported rice (P=0.002). Difference for As in the local and imported rice was not significant (P=0.218). A statistically significant difference was found between the imported and Iranian rice (P=0.354). There were no significant differences among all the measured heavy metals in the tested samples of India and Pakistan rice, both legally and illegally (P=0.144). Conclusion: It was found that the rice was contaminated with heavy elements; it is recommended that measures should be taken to promote healthy rice production, including periodic monitoring of heavy metals in the water and rice seeds, establishing an appropriate operating system to reduce heavy metal emissions, using international experiences on the effects and complications of heavy metals in water resources and farming, and performing quality control measures on the imported rice.
Leila rezaei; Vali Alipour; Sakine shokooheyan; Amin Ghanbarnejad
Volume 2, Issue 1 , January 2014, , Pages 36-41
Abstract
Background: Pre-chlorination of raw water containing natural organic matters may lead to forming harmful disinfection by-products such as trihalomethanes (THMs), the measurement of which needs expensive advanced analytical instruments. This study was conducted to anticipate THMs formation potential in ...
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Background: Pre-chlorination of raw water containing natural organic matters may lead to forming harmful disinfection by-products such as trihalomethanes (THMs), the measurement of which needs expensive advanced analytical instruments. This study was conducted to anticipate THMs formation potential in Bandar Abbas drinking water system using cheap and simple experiments and a mathematical model. Methods: In a 24 week sampling program, 96 samples were collected weekly from raw water (RW), clarification (CE), filtration (FE), and disinfection effluent (DE). After measuring the Dissolved Organic Carbon (DOC), residual chlorine, contact time, temperature and pH of water, THMs concentration was calculated using a mathematical model. Results: The means of DOC concentration in RW, CE, FE and DE were 5.56, 4.21, 3.50, and 3.01 (mg/l), respectively. The mean of temperature values varied from 22.28 in RW to 21.25 in DE and the mean of pH variations was measured from 6.75 in DE to 8.37 in CE. Also, the mean of residual chlorine concentration was 0.0 to 1.72 in RW and DE, respectively. Conclusion: The means of calculated THMs were 37.92±4.82μg/l, 51.15±9.44μg/l, and 52.71±8.37μg/l for CE, FE, and DE respectively; this did not meet the related EPA standard (30- 40μg/l); therefore, further detailed studies should be conducted to resolve the consumers’ concerns in this regard.
Hamid Reza Zeinaddine; Afshin Ebrahimi; Vali Alipour; Leila Rezaei
Volume 1, Issue 2 , October 2013, , Pages 89-93
Abstract
Background: This study aimed to determine the efficiency of the intermittent cycle extended aeration system (ICEAS) and the removal conditions of treating contaminants, especially nitrogen phosphorus from sea shopping center wastewater.Methods: Experiment was carried out on fish distribution center of ...
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Background: This study aimed to determine the efficiency of the intermittent cycle extended aeration system (ICEAS) and the removal conditions of treating contaminants, especially nitrogen phosphorus from sea shopping center wastewater.Methods: Experiment was carried out on fish distribution center of Bandar Abbas and 30 samples were collected in a 6 month period from the inlet of the market septic tank. The used pilot study carried out consisted of two zones: pre-react and main react zones. They were divided using a baffle wall. Firstly, wastewater enters a pre-react zone and then through the opening at the bottom of the baffle wall it enters the main react zone. The experiment was carried out with three simultaneous cycles per day.Results: The results showed that the mean of BOD5, COD, phosphorus, and nitrate and nitrite removal was 91.5, 86.7, 59.5, 49, and 80.8 percent, respectively.Conclusion: It was shown that the system is able to remove nitrogen and phosphorus almost similar to other proprietary phosphorus removal processes and with lower cost; however, it is not a proprietary process.
