Ahmad Alah Abadi; Aalieh Tabasi; Ayyob Rastegar; Ali Akbar Rodbari; Amin Masoodi
Abstract
Abstract Background and purpose: The presence of drugs in water and wastewater sources poses risks to humans and the environment. These materials are not completely eliminated by conventional water and wastewater treatment methods. This study aimed to investigate the photocatalytic removal of acetaminophen ...
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Abstract Background and purpose: The presence of drugs in water and wastewater sources poses risks to humans and the environment. These materials are not completely eliminated by conventional water and wastewater treatment methods. This study aimed to investigate the photocatalytic removal of acetaminophen from aqueous solutions by the advanced UV/H2O2/ZnO oxidation method. Materials and Methods: In this experimental analytical study, zinc oxide and hydrogen peroxide were used in a 500 ml reactor under UV-C irradiation to remove acetaminophen. The effects of initial parameters of acetaminophen, solution pH, contact time, hydrogen peroxide concentration, and zinc oxide nanoparticle concentration were investigated. Experiments were designed and analyzed using the CCD method by Design Expert 10 software. Results:Themaximum removal efficiency of acetaminophen was obtained as 94% at pH 7, contact time 8 min, the initial contaminant concentration 62.5 mg/l, catalyst dose 0.0275 g, and H2O2 concentration 2 ml. By changing the time to 1 and 15 minutes, the removal rate decreased by 26 and 76%, respectively, and by increasing the catalyst dose from 0.0275 g to 0.05 g, the removal rate increased by 99%. Conclusion:In this study, the efficiency decreased with increasing contaminant concentration. The removal efficiency was higher in neutral conditions than in acidic and alkaline conditions. The photocatalytic process (UV/H2O2/ZnO) is highly potent for removing acetaminophen from aqueous solutions.
Abolfazl Rahmani Sani; Aalieh Tabasi; Mohammad Miri
Abstract
Abstract Background and Aim: Increasing wastewater production and increasing waste production are major threats to human health and the environment; therefore, wastewater treatment and waste reuse should be done. This study aimed to determine the efficiency of plastic, rubber, and electronic wastes for ...
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Abstract Background and Aim: Increasing wastewater production and increasing waste production are major threats to human health and the environment; therefore, wastewater treatment and waste reuse should be done. This study aimed to determine the efficiency of plastic, rubber, and electronic wastes for municipal wastewater treatment by the microbial electrochemical method. Materials and methods: This experimental-practical research was done on a pilot scale. Impacts of time and initial characteristics (temperature, pH, and EC) on the treatment efficiency were investigated. During the research, sampling (twice a week) was done from the input and output of the reactor, and BOD , COD, TSS, pH, and EC parameters were measured according to the standard methods. The results were analyzed by Excel 2010 software. Results: Mean BOD 5 , COD, and TSS in raw sewage were 227, 302, and 274 mg/l. BOD5 removal efficiencies by electronic, rubber, plastic and control wastes were 72.46, 69.74, 60.82, and 62.17%, respectively. Electronic wastes with 55.52% and 79.96% had the highest removal efficiencies of TSS and COD, respectively. Conclusion: Bed material affects BOD 5 removal efficiency. Substrates with electronic wastes and crumb rubber had a higher efficiency in removing BOD 5 , TSS, and COD, which shows the superior characteristics of wastewater treatment by these wastes. Key words: Municipal Wastewater Treatment; Chemical Electro Microbial Process; Electrobacter; Waste