Sara Yasina Yusuf
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Preferred name
Sara Yasina Yusuf
Official Name
Sara Yasina, Yusuf
Alternative Name
Yusuf, S. Y.A.
Yusof, Sara Yasina
Yusuf, Sara Yasina
Yusuf, Sara Y.
Yusof, S. Y.
Sara, Y. Y.
Yusuf, S. Y.
Main Affiliation
Scopus Author ID
57221740411
Researcher ID
B-9242-2012

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Removal of molluscicide compound: A comparison of metaldehyde removal performance between rubber-based aerobic granules and molasses-based aerobic granules

2023-12-01 , Saad A.M. , Farrah Aini Dahalan , Naimah Ibrahim , Sara Yasina Yusuf

Rubber-based aerobic granules (RAGS) were developed in a bioreactor. Outside of the bioreactor, RAGS were supplemented with molasses wastewater to produce molasses-based aerobic granules (MAGS). Rates of RAGS and MAGS elimination and growth were calculated across a range of 180–330 mg/L of metaldehyde. Metaldehyde removal rates for RAGS and MAGS were 84 % and 85 %, correspondingly. Rates of biodegradation (K1) ranged from 0.402 to 0.063 h−1 for RAGS and from 0.404 to 0.065 h−1 for MAGS. There was a negative correlation between metaldehyde concentration and the first-order rate constant. MAGS had somewhat higher metaldehyde removal capacities than RAGS, with a lower Ks value (234 mg/L) than RAGS (282 mg/L). The MAGS had a higher μmax (0.188 day−1) value than the RAGS (0.129 day−1). RAGS and MAGS show promise for use in aerobic granular sludge remedy of wastewater due to their ability to degrade metaldehyde.

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Chemical extraction and quantification of extracellular polymeric substances in unspiked-metaldehyde and spiked-metaldehyde of rubber aerobic granular sludge and molasses aerobic granular sludge

2023-12-01 , Saad A.M. , Farrah Aini Dahalan , Naimah Ibrahim , Sara Yasina Yusuf

The building blocks of biofilm are called extracellular polymeric substances (EPSs), and they are composed of biopolymers. The optimal properties of EPSs include chemical interactions, resistance to dehydration, and resilience in the face of hazardous shock loads. It is necessary to have an understanding of EPSs extraction, composition, and the biomatrix's reaction to contaminants. This research aims to conduct chemical extraction to determine the amounts of EPSs found in unspiked-metaldehyde and spiked-metaldehyde rubber aerobic granular sludge (rAGS) and newly invented molasses aerobic granular sludge (mAGS). The rAGS was produced by feeding synthetic wastewater into sequencing batch reactors (SBRs). The mAGS was developed by adding the rAGS with different volumes of molasses wastewater. The EPSs were successfully extracted and identified by quantifying the number of proteins and carbohydrates present in each rAGS and mAGS condition. Hydroxyl, carboxyl, and amino groups showed that rAGS and mAGS EPSs contained carbohydrates and proteins. The compositions of the EPSs showed a strong correlation with the concentrations of metaldehyde in the spiked-metaldehyde rAGS and mAGS samples. When the total EPSs are taken into consideration, both rAGS and mAGS that are formed are effective treatments for metaldehyde treatment in wastewater.

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