High rate treatment of hospital wastewater using activated sludge process induced by high-frequency ultrasound

Karami, Nasim and Mohammadi, Parviz and Zinatizadeh, Aliakbar and Falahi, Farzaneh and Aghamohammadi, Nasrin (2018) High rate treatment of hospital wastewater using activated sludge process induced by high-frequency ultrasound. Ultrasonics Sonochemistry, 46. pp. 89-98. ISSN 1350-4177

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Official URL: https://doi.org/10.1016/j.ultsonch.2018.04.009


The biomass concentration of conventional activated sludge (CAS) process due to low sludge sedimentation in clarifiers is limited to 3000 mg/L. In this study, high-frequency ultrasound wave (1.8 MHz) was applied to enhance the CAS process performance using high Mixed Liquor Suspended Solid (MLSS) concentration. The study conducted using a pilot scale CAS bioreactor (with and without ultrasound) and their performance for treating a hospital wastewater were compared. Experimental conditions were designed based on a Central Composite Design (CCD). The sets of data analyzed, modeled and optimized using Response Surface Methodology (RSM). The effect of MLSS concentration 3000–8000 mg/L and hydraulic retention time (HRT) 2–8 h are considered as operating variables to investigate on process responses. The obtained results showed that high-frequency ultrasound was significantly decreased the sludge volume index (SVI) 50% and effluent turbidity about 88.5% at high MLSS. Also, observed that COD removal of both systems was nearly similar, as the maximum COD removal for sonicated and non-sonicated systems were 92 and 92.5% respectively. However, this study demonstrates that the ultrasound irradiation has not had any negative effect on the microbial activity.

Item Type: Article
Uncontrolled Keywords: Activated sludge; High-frequency ultrasound; Mixed Liquor Suspended Solid; Response surface methodology
Subjects: R Medicine
Divisions: Faculty of Medicine
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 22 Jul 2019 06:32
Last Modified: 22 Jul 2019 06:32
URI: http://eprints.um.edu.my/id/eprint/21692

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