Fatemeh Sadat Arghavan; Behnam Barikbin; Negin Nasseh; Hosein Alidadi
Abstract
Background and Purpose: Removing pharmaceutical substances from wastewater is essential due to their high stability and toxic effects on humans and other living organisms before they enter the environment. Green-synthesized nanocomposites possess significant abilities to degrade pharmaceutical compounds ...
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Background and Purpose: Removing pharmaceutical substances from wastewater is essential due to their high stability and toxic effects on humans and other living organisms before they enter the environment. Green-synthesized nanocomposites possess significant abilities to degrade pharmaceutical compounds and exhibit antibacterial effects. Therefore, this study aimed to investigate the photocatalytic and antibacterial effects of a green-synthesized magnetic nanocomposite.Materials and Methods: In this experimental study, the photocatalytic process was conducted on a solution containing tetracycline to examine the photocatalytic capabilities of the synthesized nanocomposite. The antibacterial effect of the nanocomposite was also assessed on Gram-negative and Gram-positive bacteria using the broth dilution method.Results: The results of the tetracycline antibiotic photocatalytic degradation test showed a removal rate of 87.95% under the following conditions: pH = 7, nanocomposite dose = 0.26 g/L, contact time = 54 min, and initial TC concentration of 10 mg/L. The minimum inhibitory concentration (MIC) of the synthesized nanocomposite was determined to be 1.25 mg/mL for Staphylococcus aureus bacteria and 5 mg/mL for Escherichia coli and Klebsiella bacteria. The minimum bactericidal concentration (MBC) against Escherichia coli and Staphylococcus aureus bacteria was found to be 5 mg/mL.Conclusion: In addition to the inhibitory and bactericidal capabilities of the manganese-ferrite-based nanocomposite, it can be utilized as a powerful catalyst for the degradation of tetracycline antibiotics in aqueous solutions
Salehe Salehnia; Behnam Barikbin; Rasoul Khosravi
Abstract
Introduction :In recent years, concerns have been raised about the presence of a wide range of drug substances and antibiotics in aquatic environments. Usually these materials are due to the inefficiency of conventional wastewater treatment technologies, From various routes such as agricultural runoff, ...
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Introduction :In recent years, concerns have been raised about the presence of a wide range of drug substances and antibiotics in aquatic environments. Usually these materials are due to the inefficiency of conventional wastewater treatment technologies, From various routes such as agricultural runoff, direct discharge from urban wastewater treatment plants, human waste products, direct disposal of medical waste, industry, etc. into aquatic environments. The present study aims at the removal of penicillin G through electrofenton process in the aqueous solution. Methods : The present study was conducted on laboratory scale in tanks made of glass using iron electrodes with useful volume 400 cc. The device is equipped with a flow rate regulator and voltage regulator to control these variables. Urban alternate current forms the input to the devices. The tank was filled with synthetic penicillin G with a concentration of 50-200 mg/L. The removal of penicillin G at potential 26V, the intensity of the 0.05-0.6A, Time 0-120 min, pH: 3-12 and the distance between the electrodes was measured in the range of 1-4cm. Results: The aim of present study was to the potential of the processes of electrofenton removal of penicillin G in aquatic environments. The results were pH of 3, the electric current density 0.6A, reaction time 20min, the concentration of antibiotic 50mg/l, and the distance between electrodes 1cm with concentration of H2O2 25mmol . in these circumstances, the results showed that electrocoagulation process is the ability to remove 100 percent of the pollutants. Conclusion: The results of this study illustrate that electrofenton process with iron electrodes is cost-effective removal of organic compounds.
Mina Mortazavi; Taher Shahryari; Farzaneh Fanaei; Behnam Barikbin
Abstract
Background and purpose: One of the fundamental factors of water quality management plan is being guaranteed the qualitative and quantitative stability of fresh water in water supply systems. Water safety plan is a systematic approach that guarantees the constant supply of drinking water emphasizing the ...
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Background and purpose: One of the fundamental factors of water quality management plan is being guaranteed the qualitative and quantitative stability of fresh water in water supply systems. Water safety plan is a systematic approach that guarantees the constant supply of drinking water emphasizing the prevention of water pollution from catchment to the consumer. Material and methods: WSP-QA TOOL is employed as an instruction in order to assess the safety circumstance and identify vulnerability of water supply system in Torbat Jam; so that the necessary information aligned with WSP approach was provided based on current evidence of water and waste water company and related organization and interviewing experts and then it was analyzed in Excel. Results: The results of this study showed that by obtaining 159 scores of the total score evaluated, only 36.14% of the accordance between the approach in Torbat Jam city water supply system and the approach proposed by the World Health Organization. Among this, the management procedures with 66.67% and the formation of the WSP team with the 10%, has dedicated the highest and lowest amount of the coincided implementation with the plan, respectively. Conclusion: Because of the inadequacy of the conventional water quality control approach, which instead of preventing contamination only detects it, has the potential to cause various contamination in the water supply system, especially through vulnerable system. Therefore, planning to implement and develop a water safety plan as a basic method for reaching the goal of water health.