Elahe Jafari Hafshajani; Mehran Hoodaji; Faezeh Ghanati; Yaghoob Hosseini; Vali Alipour
Abstract
Background: Magnetization of water, as a factor that stimulates the other factors related to plant growth, is an affective physical solution on plant resistance and yield.Methods: In this case-control research, the effect of magnetized water on cadmium removal by Lantana camara was investigated. An experiment ...
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Background: Magnetization of water, as a factor that stimulates the other factors related to plant growth, is an affective physical solution on plant resistance and yield.Methods: In this case-control research, the effect of magnetized water on cadmium removal by Lantana camara was investigated. An experiment with completely randomized-block design was done to irrigate the plant pots using 3 levels of water treatment (W1: magnetic, W2: semi magnetized and W3 non-magnetized:) and 4 levels of cadmium 0, 0.5, 1, and 2 mg/L with 3 replications.Results: The results showed that the interaction effects of cadmium levels and irrigation water treatment on soil, shoot, and root cadmium content were significant. The amount of soil cadmium decreased by 39.49 percent by increasing the concentration of metal (2 mg/L) in irrigation water under the influence of magnetized water treatment. Evaluation of cadmium accumulation, adsorption index and transfer factor showed that the highest amount of them in the treatment of 2 mg / l cadmium in the surface of magnetized water was equal to 0.836, 0.034, and 1.654 respectively. The lowest shoot and root cadmium under the influence of magnetic water treatment was 0.559 and 0.303 (mg Kg-1), respectively, which was significant compared to non-magnetized water treatment. The enzyme activity of CAT (Catalase), SOD (superoxide dismutase), POD (peroxidase), phenol, phenoloid, and anthocyanin was increased by applying magnetic water treatment.Conclusion: Magnetized water by increasing the cadmium absorption by plants and stimulating the plant antioxidants had a significant effect on the absorption and transport of cadmium and increased the efficiency of refining plants by Lantana camara plant.
Mohammad Reza Samaei; Razieh Ashoori; Abooalfazl Azhdarpoor; Saeed Yousefinejad
Abstract
Background: Simultaneous existence of excessive amounts of fluoride and nitrate in drinking water can cause health problems for humans. In this study, simultaneous removal of fluoride and nitrate from aqueous solutions was investigated using a combination of electroreduction and electrocoagulation processes ...
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Background: Simultaneous existence of excessive amounts of fluoride and nitrate in drinking water can cause health problems for humans. In this study, simultaneous removal of fluoride and nitrate from aqueous solutions was investigated using a combination of electroreduction and electrocoagulation processes in a batch reactor with different electrodes. Methods: In this study, at first, an optimum electrode was selected. Afterward, the effects of different operating parameters such as the current density (12- 36 mA/cm2), initial pH (5.5-8.5), NaCl concentration (0.5-1.5gr/L), and electrolysis time (15-120 min), ) on the removal of fluoride (initial concentration: 6 mg/L) and nitrate (initial concentration: 150 mg/) were evaluated, respectively. Results: The highest efficiency of the concurrent fluoride and nitrate removal with Al-Cu electrode and in optimal experimental conditions of the current density of 36 mA/cm2, pH of 7, NaCl concentration of 1gr/L, and electrolysis time of 90 minutes was obtained 87.04 and 89.70%, respectively. Conclusion: High catalytic activity of the copper cathode resulted in better performance than other cathodes in the simultaneous removal of fluoride and nitrate. Generally, it can be concluded that the electrochemical process can reduce the levels of fluoride and nitrate to the amounts below the WHO standard limits, 1.5 mg/L and 50 mg/L, respectively.
Marziyeh Ansari Shiri; mansooreh dehghani; Mohammad Reza Samaei
Volume 4, Issue 3 , July 2016, , Pages 121-128
Abstract
Background: Atrazine is a widely used herbicide. The increasing salinity of many water resources has had a negative effect on atrazine biodegradation. The aim of this study was to isolate atrazine degrading bacteria in semi-salinity media. Methods: Nine selected bacterial species were cultivated on ...
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Background: Atrazine is a widely used herbicide. The increasing salinity of many water resources has had a negative effect on atrazine biodegradation. The aim of this study was to isolate atrazine degrading bacteria in semi-salinity media. Methods: Nine selected bacterial species were cultivated on the mineral salt broth culture medium containing atrazine (50, 100, 500 mg/L), NaCl concentration (10 g/L), and 2% (wt/vol) agar. The bacteria with higher growths in the atrazine medium (500 mg/L) were selected. Then, those with higher growths were transferred to the medium with atrazine concentration of 1000 mg/L. The atrazine biodegradation rates by Ochrobactrum oryzae and consortium bacteria (all of the nine bacteria species) were compared by cultivating separately on the mineral salt broth containing atrazine concentration of 30 mg/l, and NaCl concentration of 10 g/L in the incubation time of 10 day and HPLC analysis. Results: The results indicated that Ochrobactrum oryzae had the highest growth compared to the other investigated bacteria (Acinetobacter radioresistens, Paenibacillus lautus, and Bacillus sp) in the mineral salt broth culture medium containing atrazine concentrations (1000 mg/L), NaCl (10 g/L), and 2% (wt/vol) agar. In the Ochrobactrum oryzae and bacterial consortium comparison, atrazine biodegradation rate in the culture medium containing NaCl, by Ochrobactrum oryzae, was higher than bacterial consortium and atrazine biodegradation rate in the culture medium with no NaCl addition, by Ochrobactrum oryzae, was lower than bacterial consortium. Conclusion: Based on the results, Ochrobactrum oryzae was significantly capable of atrazine biodegradation in the semisalinity aqueous environment.
