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Dr. Muhammad Shoaib
Sungkyunkwan University

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0 Water Quality
0 Water Quality Modeling
0 Dissolved Oxygen
0 eutrophication
0 Water Quality Assessment

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Journal article
Published: 20 December 2018 in Sustainability
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The zinc oxide nanoparticles (ZnO NPs) and surfactants that are widely used in commercial and industrial products lead to the likelihood of their co-occurrence in natural water, making it essential to investigate the effect of surfactants on the fate and mobility of ZnO NPs. The present study seeks to elucidate the effect of an anionic sodium dodecyl sulfate (SDS) and a nonionic nonylphenol ethoxylate (NPEO), on ZnO NPs adsorption, aggregation, dissolution, and removal by the coagulation process. The results indicate that the presence of SDS in ZnO NPs suspension significantly reduced the ζ-potential and hydrodynamic diameter (HDD), while the effect of NPEO was found not to be significant. The sorption of SDS and NPEO by ZnO NPs were fitted with Langmuir model, but the Freundlich isotherm was more suitable for SDS at pH 9.0. Moreover, the adsorption was strongly pH-dependent due to the formation of mono-bilayer patches onto the NPs. The SDS remarkably affect the dissolution and aggregation phenomena of ZnO NPs in natural waters as compared to NPEO. Finally, the coagulation results showed that the removal efficiency of ZnO, Zn2+ and the surfactant in synthetic and wastewaters at optimum ferric chloride (FC) dosage reached around 85–98% and 20–50%, respectively. Coagulation mechanism investigation demonstrated that the cooperation of charge neutralization and adsorptive micellar flocculation (AMF) might play an important role. In summary, this study may provide new insight into the environmental behavior of coexisting ZnO NPs and surfactants in water treatment processes, and it may facilitate their sustainable use in commercial products and processes.

ACS Style

Rizwan Khan; Muhammad Inam; Muhammad Iqbal; Muhammad Shoaib; Du Park; Kang Lee; SooKyo Shin; Sarfaraz Khan; Ick Yeom. Removal of ZnO Nanoparticles from Natural Waters by Coagulation-Flocculation Process: Influence of Surfactant Type on Aggregation, Dissolution and Colloidal Stability. Sustainability 2018, 11, 17 .

AMA Style

Rizwan Khan, Muhammad Inam, Muhammad Iqbal, Muhammad Shoaib, Du Park, Kang Lee, SooKyo Shin, Sarfaraz Khan, Ick Yeom. Removal of ZnO Nanoparticles from Natural Waters by Coagulation-Flocculation Process: Influence of Surfactant Type on Aggregation, Dissolution and Colloidal Stability. Sustainability. 2018; 11 (1):17.

Chicago/Turabian Style

Rizwan Khan; Muhammad Inam; Muhammad Iqbal; Muhammad Shoaib; Du Park; Kang Lee; SooKyo Shin; Sarfaraz Khan; Ick Yeom. 2018. "Removal of ZnO Nanoparticles from Natural Waters by Coagulation-Flocculation Process: Influence of Surfactant Type on Aggregation, Dissolution and Colloidal Stability." Sustainability 11, no. 1: 17.

Journal article
Published: 15 October 2018 in International Journal of Environmental Research and Public Health
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A river water quality spatial profile has a diverse pattern of variation over different climatic regions. To comprehend this phenomenon, our study evaluated the spatial scale variation of the Water Quality Index (WQI). The study was carried out over four main climatic classes in Asia based on the Koppen-Geiger climate classification system: tropical, temperate, cold, and arid. The one-dimensional surface water quality model, QUAL2Kw was selected and compared for water quality simulations. Calibration and validation were separately performed for the model predictions over different climate classes. The accuracy of the water quality model was assessed using different statistical analyses. The spatial profile of WQI was calculated using model predictions based on dissolved oxygen (DO), biological oxygen demand (BOD), nitrate (NO3), and pH. The results showed that there is a smaller longitudinal variation of WQI in the cold climatic regions than other regions, which does not change the status of WQI. Streams from arid, temperate, and tropical climatic regions show a decreasing trend of DO with respect to the longitudinal profiles of main river flows. Since this study found that each climate zone has the different impact on DO dynamics such as reaeration rate, reoxygenation, and oxygen solubility. The outcomes obtained in this study are expected to provide the impetus for developing a strategy for the viable improvement of the water environment.

ACS Style

Muhammad Mazhar Iqbal; Muhammad Shoaib; Hafiz Umar Farid; Jung Lyul Lee. Assessment of Water Quality Profile Using Numerical Modeling Approach in Major Climate Classes of Asia. International Journal of Environmental Research and Public Health 2018, 15, 2258 .

AMA Style

Muhammad Mazhar Iqbal, Muhammad Shoaib, Hafiz Umar Farid, Jung Lyul Lee. Assessment of Water Quality Profile Using Numerical Modeling Approach in Major Climate Classes of Asia. International Journal of Environmental Research and Public Health. 2018; 15 (10):2258.

Chicago/Turabian Style

Muhammad Mazhar Iqbal; Muhammad Shoaib; Hafiz Umar Farid; Jung Lyul Lee. 2018. "Assessment of Water Quality Profile Using Numerical Modeling Approach in Major Climate Classes of Asia." International Journal of Environmental Research and Public Health 15, no. 10: 2258.

Journal article
Published: 10 August 2018 in Water
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One of the challenging problems of Punjab, the most populous province of Pakistan, is the surface water-quality problem of the Ravi River, which flows through the main cities of the province. At present, the overall status of water quality is very polluted, primarily due to residential and industrial wastewater directly discharged into the Ravi River through a network of drains. Due to the poor quality of the water, the river ecosystem is not favorable for the aquatic and surrounding environment. Hence, management options are proposed to reduce pollution. Therefore, the study was formulated to identify the main sources of pollution along the Ravi River and their potential impact on the course of the river channel. In addition, the study applied a numerical model WASP 8.1 (Water Quality Simulation Program) to discover the best strategy for the improvement of water quality. Through the model simulation it was found that, if the flow at headwater and link canals is increased up to 50%, along with 75% improvement in the pollution concentration of drains through wastewater-treatment facilities, the water quality of the Ravi River can be improved up to an acceptable limit of water-quality standards.

ACS Style

Muhammad Mazhar Iqbal; Muhammad Shoaib; Paul Agwanda; Jung Lyul Lee. Modeling Approach for Water-Quality Management to Control Pollution Concentration: A Case Study of Ravi River, Punjab, Pakistan. Water 2018, 10, 1068 .

AMA Style

Muhammad Mazhar Iqbal, Muhammad Shoaib, Paul Agwanda, Jung Lyul Lee. Modeling Approach for Water-Quality Management to Control Pollution Concentration: A Case Study of Ravi River, Punjab, Pakistan. Water. 2018; 10 (8):1068.

Chicago/Turabian Style

Muhammad Mazhar Iqbal; Muhammad Shoaib; Paul Agwanda; Jung Lyul Lee. 2018. "Modeling Approach for Water-Quality Management to Control Pollution Concentration: A Case Study of Ravi River, Punjab, Pakistan." Water 10, no. 8: 1068.