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Your search keyword '"Mehrnia, Mohammad Reza"' showing total 3 results
Start Over Author "Mehrnia, Mohammad Reza" Topic bioreactors Topic wastewater treatment
3 results on '"Mehrnia, Mohammad Reza"'

1. MBR technology: A practical approach for petrochemical wastewater treatment.

Author

Sadeghi, Fatemeh, Mehrnia, Mohammad Reza, Nabizadeh, Ramin, Bahadori, Mohammad Bagher, and Sarrafzadeh, Mohammad Hossein

Subjects
*BIOREACTORS, *PETROLEUM chemicals, *WASTEWATER treatment, *FOULING, *SALINITY
Abstract

In this research membrane bioreactor (MBR) technology as a novel and practical technology was studied for treatment of saline petrochemical wastewater. Membrane fouling and permeability, mixed liquor properties such as change of flock size, and effluent characteristics of MBR were measured in presence of various salt concentrations in the feed. The results showed that the increasing the salinity reduced cake layer, total membrane resistances and increased the membrane permeability and sludge particle size. Also, COD removal efficiencies were up to 91% in all trials. These results indicate that the MBR was highly efficient for treating saline petrochemical wastewater. [ABSTRACT FROM PUBLISHER]

Published
2017
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2. Petrochemical wastewater treatment and reuse by MBR: A pilot study for ethylene oxide/ethylene glycol and olefin units.

Author

Bayat, Mitra, Mehrnia, Mohammad Reza, Hosseinzadeh, Mostafa, and Sheikh-Sofla, Reza

Subjects
PETROLEUM chemicals, WASTEWATER treatment, BIOREACTORS, ETHYLENE glycol, ALKENES, ETHYLENE oxide
Abstract

This study aims to investigate the technical feasibility of employing membrane bioreactor (MBR) as a practical approach for ethylene oxide/ethylene glycol (EO/EG) and olefin units wastewater treatment in a petrochemical complex. EO/EG unit wastewater mainly contains ethylene glycol and acetaldehyde and olefin unit wastewater includes benzene and ethyl benzene, with COD concentration of 1900 ± 900 mg/L and 900 ± 300 mg/L, respectively. Experimental studies of MBR pilot plants with volume of 2.5 m 3 were carried out during 6 months in different HRTs and various mixed ratios of EO/EG to olefin unit wastewater. Results revealed that using MBR, COD removal efficiency of 97.5% is accomplished in HRT of 13.5 h for EO/EG and 85% in HRT of 18 h for olefin wastewater. For the mixed ratio of 2/1 and in HRT of 18 and 24 h, COD removal efficiency of 93.5% and 96% was achieved, respectively. Membrane fouling was analyzed at different MLSS concentrations. The results at optimum MLSS of 8 g/L revealed that fouling resistance is mainly due to the membrane pore blocking, and cake and gel resistances contribute less to membrane fouling. Results indicated that MBR is a promising technology for treatment of high fluctuation toxic components in petrochemical wastewater. [ABSTRACT FROM AUTHOR]

Published
2015
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3. Membrane bioreactor for treatment of pharmaceutical wastewater containing acetaminophen

Author

Shariati, Farshid Pajoum, Mehrnia, Mohammad Reza, Salmasi, Bahreh Madadkhah, Heran, Marc, Wisniewski, Christelle, and Sarrafzadeh, Mohammad Hossein

Subjects
*ARTIFICIAL membranes, *WASTEWATER treatment, *ACETAMINOPHEN, *BIOREACTORS, *CHEMICAL oxygen demand, *ENERGY consumption, *DRUGS, *WATER pollution
Abstract

Abstract: Treatment of pharmaceutical wastewater is a real challenge for wastewater engineers. In this study, a pilot-scale system including an external loop airlift membrane bioreactor (ELAMBR) was applied for treatment of a synthetic pharmaceutical wastewater. The performance of this system was evaluated in removal of acetaminophen as the main pollutant of a pharmaceutical wastewater. A conventional activated sludge (CAS process) laboratory system was used in parallel with this system to compare both systems in regard to their ability for acetaminophen removal. The performance of the ELAMBR system was monitored for approximately one month to investigate the long-term operational stability of the system and possible effects of solids retention time on the efficiency of removal of acetaminophen. The removal efficiency was significantly higher in the ELAMBR system than the CAS process. 100% of the acetaminophen was removed after 2days in this system. The results also showed that initial concentration of acetaminophen, chemical oxygen demand (COD) and mixed liquid suspended solids (MLSS) are the most effective parameters in removal of a pollutant such as acetaminophen. This study demonstrates the usefulness of ELAMBR system for pharmaceutical wastewater treatment with the advantages such as: (i) simple operation and maintenance, (ii) efficient removal of pharmaceutical pollutant and COD and (iii) low-energy consumption. [Copyright &y& Elsevier]

Published
2010
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