Khadijeh Darabi; Abooalfazl Azhdarpoor; Mansoureh Dehghani
Abstract
Background: Carbamazepine is a pharmaceutical compound used as an anticonvulsant for epilepsy and can enter the environment by inappropriate treatment of hospital wastewater. Therefore, the present study aimed to investigate the removal of carbamazepine from the aquatic environment, using the ozonation ...
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Background: Carbamazepine is a pharmaceutical compound used as an anticonvulsant for epilepsy and can enter the environment by inappropriate treatment of hospital wastewater. Therefore, the present study aimed to investigate the removal of carbamazepine from the aquatic environment, using the ozonation process. Methods: This is an experimental study in which certain concentrations of carbamazepine were removed, using the ozonation process. The effect of such factors as pH (3-11), carbamazepine concentration (5-15 ppm), ozone dose (200-400 mg/hr), and reaction time (15-180 seconds) on the removal efficiency was studied. Data analysis was performed to measure carbamazepine, using the High-Performance Liquid Chromatography (HPLC). Results: The results showed that the carbamazepine removal efficacy at pHs of 5, 7, and 11 was 81%, 66%, and 21%, respectively at 15 ppm, the reaction time of 30 seconds, and the ozone dose of 200 mg/hr, respectively. Also, at the dose of 200 and 400 mg/hr injectable ozone at pHs of 5 and 7, removal efficiency was 81%, 66%, 97%, and 78%, respectively. Conclusion: According to the results, at pH=5, reaction time of 30 seconds, the carbamazepine concentration of 15 ppm, injectable ozone dose of 200 mg/h, a removal efficiency of 81% was obtained. The ozonation process can react directly or indirectly with the drug contaminant in very low concentrations in aqueous solutions due to its high oxidation power, leading to its destruction or elimination, which may indicate that the ozonation method may be used as an effective method to remove carbamazepine and other similar contaminants.
Fallah Hashemi; Hassan Hashemi; Mansooreh Dehghani; Mohammad Hoseini
Abstract
Introduction: One of the major pollutants in the environment is heavy metals. The stability of heavy metals in the environment has created a lot of problems. Refinery effluents are one of the most important sources of heavy metals and should be treated before being discharged into the environment. ...
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Introduction: One of the major pollutants in the environment is heavy metals. The stability of heavy metals in the environment has created a lot of problems. Refinery effluents are one of the most important sources of heavy metals and should be treated before being discharged into the environment. Methods: This interventional experimental study aimed to remove heavy metals from petroleum effluent by using the micellar-enhanced ultrafiltration (MEUF) at Kermanshah Oil Refinery. Since ultrafiltration membranes alone cannot remove the heavy metals, surface active agents, such as surfactants, are injected into the effluent. Surfactant monomers in reaction to metal ions creating a complex that cannot cross the ultrafiltration membrane. Heavy metals are removed from the effluent stream. In the present study, Sodium Dodecyl Sulfate (SDS) as surfactant was used to add the effluent to improve the process of heavy metal removal. Result: The results showed that heavy metals such as nickel, lead, cadmium and chromium decreased by 96%, 95%, 92% and 86%, respectively. In the inlet effluent with increasing pH, the efficiency of the processes for metal removal increased, so that at pH = 10, the highest removal efficiency was observed. Conclusion: According to the results of this study, the use of membrane processes as a practical and efficient method in industrial wastewater treatment can be applied in various industries, especially refinery ones.
Abooalfazl Azhdarpoor; Rabieh Hoseini; Mansoureh Dehghani
Volume 3, Issue 4 , October 2015, , Pages 153-159
Abstract
Background: High amount of heavy metals in sludge is one of the major obstacles to its use on farms. The present study aimed to investigate the possibility of leaching heavy metals from wastewater sludge by Fenton method and determine the optimum level of parameters, such as iron, hydrogen peroxide, ...
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Background: High amount of heavy metals in sludge is one of the major obstacles to its use on farms. The present study aimed to investigate the possibility of leaching heavy metals from wastewater sludge by Fenton method and determine the optimum level of parameters, such as iron, hydrogen peroxide, time, and pH for Fenton reaction. Methods: The effects of various parameters, such as pH (2-9), hydrogen peroxide concentration (0.5-6 g/l), Fe concentration (0.5-4 g/l), and leaching time (5-60 min), were studied. Results: The results showed that the optimal condition for leaching of heavy metals occurred at pH of 2 3, hydrogen peroxide concentration of 3 g/l, iron concentration of 2 g/l, and leaching time of 15 min. Under these optimal conditions, 92% of Zn, 100% of Cd, 100% of Pb, and 80% of Cu were leached from the wastewater sludge. Conclusions: Fenton method can leach heavy metals from wastewater sludge through decomposition of organic materials at H2O2/Fe ratio of 1.5:2.