Fatihah Suja - Academia.edu (original) (raw)

Papers by Fatihah Suja

Research paper thumbnail of Factorial design and optimization of pinecone seed powder as a natural coagulant for organic and heavy metals removal from industrial wastewater

DESALINATION AND WATER TREATMENT, 2023

Research paper thumbnail of The effectiveness of rosehip seeds powder as a plant-based natural coagulant for sustainable treatment of steel industries wastewater

DESALINATION AND WATER TREATMENT, 2022

Research paper thumbnail of Optimization of operation conditions for the start-up of a pilot-scale anaerobic biofilm digester treating leachate

DESALINATION AND WATER TREATMENT, 2017

Research paper thumbnail of Characterization of polyaniline–Ag–rGO nanocomposites for saprophytic and pathogenic Leptospira bacteria detection in water

Polymer Bulletin, 2022

This research aims to develop polyaniline (PANI)–Ag–rGO nanocomposite thin films to detect Saprop... more This research aims to develop polyaniline (PANI)–Ag–rGO nanocomposite thin films to detect Saprophytic and Pathogenic Leptospira bacterias in water. The sol–gel method followed by a spin-coating technique was conducted in this work to synthesize nanocomposite thin films of PANI–Ag(1−x) –rGOx (x = 0.025, 0.050, 0.075, 0.100). The results revealed that PANI–Ag0.975–rGO0.025 thin film exhibited the most robust sensitivity, with the highest Ag concentration. The x-ray diffraction and field-emission scanning electron microscope analysis confirmed the structure of the nanocomposites with Ag nanospheres. The atomic force microscope study showed greater surface roughness for the nanocomposites with high Ag concentrations. Furthermore, PANI–Ag0.975–rGO0.025 nanocomposite possessed the highest electrical conductivity (2.81 Scm−1), which resulted in the excellent detection of Leptospira bacteria in water.

Research paper thumbnail of SPR response of CS-GO nanostructured thin films for selective detection of Pb(II) ions in the Saigon River, Vietnam

DESALINATION AND WATER TREATMENT, 2017

Research paper thumbnail of Performance evaluation of inclined copper-stepped solar still in a wet tropical climate

Research paper thumbnail of Performance of pilot scale anaerobic biofilm digester (ABD) for the treatment of leachate from a municipal waste transfer station

Bioresource Technology, 2018

Research paper thumbnail of Productivity modelling of a developed inclined stepped solar still system based on actual performance and using a cascaded forward neural network model

Journal of Cleaner Production, 2018

Research paper thumbnail of Preliminary Work on Optimisation of a Pilot-Scale Anaerobic Digester for the Treatment of Leachate

Research paper thumbnail of Highly sensitive SPR response of Au/chitosan/graphene oxide nanostructured thin films toward Pb (II) ions

Sensors and Actuators B: Chemical, 2014

Research paper thumbnail of Nitrogen-removal efficiency in an upflow partially packed biological aerated filter (BAF) without backwashing process

Journal of Water Reuse and Desalination, Mar 1, 2011

Research paper thumbnail of Performance and Kinetic Model of a Single-Stage Anaerobic Digestion System Operated at Different Successive Operating Stages for the Treatment of Food Waste

Research paper thumbnail of Graduate Students’ Perspectives on Study Environment Based on Exit Survey

Asian Social Science, Nov 30, 2012

Graduate exit survey was conducted in the Faculty of Engineering and Built Environment, UKM for s... more Graduate exit survey was conducted in the Faculty of Engineering and Built Environment, UKM for students graduating from Masters and PhD programs between June 2010 to May 2011. A random sampling was responded by 82 students consisting of Malaysian and international students. The survey consisted of four main parts: respondents' profile; assessment of learning gains; assessment of educational experience; assessment of academic and non-academic support issues and assessment of facilities and resources. All the data were analysed using the Statistical Package for the Social Sciences (SPSS) software version 16.0. Learning gains were evaluated by relating the gains with six Program Outcomes (PO). PO6 on lifelong learning ability was marked "very good" by masters students (53.5%) whilst the majority of PhD students gave the highest score to PO1 on comprehension and in depth understanding of field study (72.7%). For educational experience, attribute on exposure to common and professional tools, was rated "excellent" with the highest percentage of 36.6%. A percentage of 42.7% was given to commitment of the lecturers/supervisors in assisting students for assessment of academic and non academic support issues. In terms of facilities and resources, security and safety was found to be the highest satisfactory factor (39.0%) among other factors.

Research paper thumbnail of Used Cylinder Oil Modified Cold-Mix Asphalt Concrete

Journal of Applied Sciences, 2007

Research paper thumbnail of Correlation between modified fouling index (MFI) and crossflow sampler-modified fouling index (CFS-MFI) under constant flux filtration

Journal of Water Process Engineering, 2014

This study presents the development of a simple correlation between modified fouling index (MFI) ... more This study presents the development of a simple correlation between modified fouling index (MFI) and crossflow sampler-modified fouling index (CFS-MFI) to assess fouling potential of feed under constant flux mode. The study was carried out using a bench-scale experimental setup with variables including crossflow effect, feed concentration, particle types and sizes, and the intrinsic resistance of membrane. From the forty-eight experimental data, upper and lower bounds of the correlation between MFI const.flux and CFS-MFI const.flux were successfully established. The permissible range of coefficient (1.007 ≤ m ≤ 1.561) for the correlation was further verified by the dataset reported in previous study.

Research paper thumbnail of Method Development of Fouling Index Measurement for Membrane Fouling Potential Evaluation

Journal of Applied Sciences, 2014

Research paper thumbnail of Setting-up of modified fouling index (MFI) and crossflow sampler-modified fouling index (CFS-MFI) measurement devices for NF/RO fouling

Journal of Membrane Science, 2013

This paper deals with setting-up of modified fouling index (MFI) and crossflow sampler-modified f... more This paper deals with setting-up of modified fouling index (MFI) and crossflow sampler-modified fouling index (CFS-MFI) devices for prediction of fouling potential in a reverse osmosis (RO)/ nanofiltration (NF) filtration system. The setting-up procedures of the laboratory-scale MFI and CFS-MFI devices operated in constant flux were described in detail. A practical approach to test the functionality of devices was also suggested. The devices are instrumented for monitoring transmembrane pressure, crossflow velocity, and flux at a desired time interval. A series of MFI const.flux and CFS-MFI const.flux tests were carried out using various types of membranes and foulants to determine the functionality and consistency of the newly developed system. The results showed that the differences between MFI const.flux and CFS-MFI const.flux values were more significant for high polydispersed foulants (e.g., 70-100 nm colloidal silica and Aldrich humic acid) than monodispersed foulants (e.g., 22 nm particle colloidal silica). When using the polydispersed foulants, the CFS-MFI const.flux showed a better agreement with actual RO fouling trend than the MFI const.flux. These observations proved that with the presence of CFS cell, the CFS-MFI const.flux is capable of simulating a more realistic RO fouling behaviour than the MFI const.flux value (without the consideration of crossflow effect). The successful setting-up of the fouling prediction devices in this study would provide a useful guide for future researchers on the fouling potential of membrane.

Research paper thumbnail of Review of the effect of selected physicochemical factors on membrane fouling propensity based on fouling indices

Desalination, 2012

Membrane fouling is one of the major drawbacks for membrane-based technologies because it leads t... more Membrane fouling is one of the major drawbacks for membrane-based technologies because it leads to severe flux decline which requires the fouled membrane to be cleaned and replaced on a regular basis. A systematic approach that is capable of providing early diagnosis is essential to control membrane fouling. Fouling index is a measure for fouling propensity of water in reverse osmosis applications. The present paper focuses on the review from the existing literature of the various fouling indices, i.e. SDI and MFI associated with a number of selected physicochemical factors. Despite of the fact that the membrane fouling problems and their forming mechanisms have been studied by numerous researchers, the evaluation on the contributing factors towards the fouling propensity is still remained unclear. Membrane fouling propensity can be influenced by: membrane morphology (i.e. surface porosity, membrane material, membrane hydrophobicity, membrane molecular cutoff , pore size), feedwater composition (i.e. ionic strength, pH, types and concentrations of feed), and hydrodynamic conditions (i.e. crossflow velocity, permeate flux and temperature). These factors were discussed in great detail in the present review.

Research paper thumbnail of Recycling of oleochemical wastewater for boiler feed water using reverse osmosis membranes — A case study

Desalination, 2011

Currently, awareness of water conservation has increased worldwide due to water scarcity. Wastewa... more Currently, awareness of water conservation has increased worldwide due to water scarcity. Wastewater recycling appears to be attractive for water conservation. This paper addresses a case study of oleochemical wastewater treatment using an advanced process that comprises ...

Research paper thumbnail of Comparative Assessment of Membrane Fouling Propensity Using Colloidal Silica as Foulant

Applied Mechanics and Materials, 2012

Other than silt density index (SDI), modified fouling index (MFI) is claimed as one of most usefu... more Other than silt density index (SDI), modified fouling index (MFI) is claimed as one of most useful fouling predictive tools in the practice of reverse osmosis. In this study, the effect of colloidal silica particles on the MFI value with the presence of crossflow sampler (CFS) cell at the upstream of MFI setup was systematically investigated. Colloidal silica with the particle size ranging from 70-100 nm was used as the model foulant in this experiment. The feed silica suspension was 0, 50, and 200 mg/L. The effect of membrane pore size as the test membrane in the dead-end cell on the fouling indices was also studied. Polyvinylidene fluoride (PVDF) membranes with molecular weight cut-offs of 150 and 100 kDa were employed. As predicted, the experiment results demonstrated that the fouling indices increased significantly as the feed silica concentration increased. The CFS-MFI values were always lower than the MFI in all the fouling index tests due to the shear force effect generated u...

Research paper thumbnail of Factorial design and optimization of pinecone seed powder as a natural coagulant for organic and heavy metals removal from industrial wastewater

DESALINATION AND WATER TREATMENT, 2023

Research paper thumbnail of The effectiveness of rosehip seeds powder as a plant-based natural coagulant for sustainable treatment of steel industries wastewater

DESALINATION AND WATER TREATMENT, 2022

Research paper thumbnail of Optimization of operation conditions for the start-up of a pilot-scale anaerobic biofilm digester treating leachate

DESALINATION AND WATER TREATMENT, 2017

Research paper thumbnail of Characterization of polyaniline–Ag–rGO nanocomposites for saprophytic and pathogenic Leptospira bacteria detection in water

Polymer Bulletin, 2022

This research aims to develop polyaniline (PANI)–Ag–rGO nanocomposite thin films to detect Saprop... more This research aims to develop polyaniline (PANI)–Ag–rGO nanocomposite thin films to detect Saprophytic and Pathogenic Leptospira bacterias in water. The sol–gel method followed by a spin-coating technique was conducted in this work to synthesize nanocomposite thin films of PANI–Ag(1−x) –rGOx (x = 0.025, 0.050, 0.075, 0.100). The results revealed that PANI–Ag0.975–rGO0.025 thin film exhibited the most robust sensitivity, with the highest Ag concentration. The x-ray diffraction and field-emission scanning electron microscope analysis confirmed the structure of the nanocomposites with Ag nanospheres. The atomic force microscope study showed greater surface roughness for the nanocomposites with high Ag concentrations. Furthermore, PANI–Ag0.975–rGO0.025 nanocomposite possessed the highest electrical conductivity (2.81 Scm−1), which resulted in the excellent detection of Leptospira bacteria in water.

Research paper thumbnail of SPR response of CS-GO nanostructured thin films for selective detection of Pb(II) ions in the Saigon River, Vietnam

DESALINATION AND WATER TREATMENT, 2017

Research paper thumbnail of Performance evaluation of inclined copper-stepped solar still in a wet tropical climate

Research paper thumbnail of Performance of pilot scale anaerobic biofilm digester (ABD) for the treatment of leachate from a municipal waste transfer station

Bioresource Technology, 2018

Research paper thumbnail of Productivity modelling of a developed inclined stepped solar still system based on actual performance and using a cascaded forward neural network model

Journal of Cleaner Production, 2018

Research paper thumbnail of Preliminary Work on Optimisation of a Pilot-Scale Anaerobic Digester for the Treatment of Leachate

Research paper thumbnail of Highly sensitive SPR response of Au/chitosan/graphene oxide nanostructured thin films toward Pb (II) ions

Sensors and Actuators B: Chemical, 2014

Research paper thumbnail of Nitrogen-removal efficiency in an upflow partially packed biological aerated filter (BAF) without backwashing process

Journal of Water Reuse and Desalination, Mar 1, 2011

Research paper thumbnail of Performance and Kinetic Model of a Single-Stage Anaerobic Digestion System Operated at Different Successive Operating Stages for the Treatment of Food Waste

Research paper thumbnail of Graduate Students’ Perspectives on Study Environment Based on Exit Survey

Asian Social Science, Nov 30, 2012

Graduate exit survey was conducted in the Faculty of Engineering and Built Environment, UKM for s... more Graduate exit survey was conducted in the Faculty of Engineering and Built Environment, UKM for students graduating from Masters and PhD programs between June 2010 to May 2011. A random sampling was responded by 82 students consisting of Malaysian and international students. The survey consisted of four main parts: respondents' profile; assessment of learning gains; assessment of educational experience; assessment of academic and non-academic support issues and assessment of facilities and resources. All the data were analysed using the Statistical Package for the Social Sciences (SPSS) software version 16.0. Learning gains were evaluated by relating the gains with six Program Outcomes (PO). PO6 on lifelong learning ability was marked "very good" by masters students (53.5%) whilst the majority of PhD students gave the highest score to PO1 on comprehension and in depth understanding of field study (72.7%). For educational experience, attribute on exposure to common and professional tools, was rated "excellent" with the highest percentage of 36.6%. A percentage of 42.7% was given to commitment of the lecturers/supervisors in assisting students for assessment of academic and non academic support issues. In terms of facilities and resources, security and safety was found to be the highest satisfactory factor (39.0%) among other factors.

Research paper thumbnail of Used Cylinder Oil Modified Cold-Mix Asphalt Concrete

Journal of Applied Sciences, 2007

Research paper thumbnail of Correlation between modified fouling index (MFI) and crossflow sampler-modified fouling index (CFS-MFI) under constant flux filtration

Journal of Water Process Engineering, 2014

This study presents the development of a simple correlation between modified fouling index (MFI) ... more This study presents the development of a simple correlation between modified fouling index (MFI) and crossflow sampler-modified fouling index (CFS-MFI) to assess fouling potential of feed under constant flux mode. The study was carried out using a bench-scale experimental setup with variables including crossflow effect, feed concentration, particle types and sizes, and the intrinsic resistance of membrane. From the forty-eight experimental data, upper and lower bounds of the correlation between MFI const.flux and CFS-MFI const.flux were successfully established. The permissible range of coefficient (1.007 ≤ m ≤ 1.561) for the correlation was further verified by the dataset reported in previous study.

Research paper thumbnail of Method Development of Fouling Index Measurement for Membrane Fouling Potential Evaluation

Journal of Applied Sciences, 2014

Research paper thumbnail of Setting-up of modified fouling index (MFI) and crossflow sampler-modified fouling index (CFS-MFI) measurement devices for NF/RO fouling

Journal of Membrane Science, 2013

This paper deals with setting-up of modified fouling index (MFI) and crossflow sampler-modified f... more This paper deals with setting-up of modified fouling index (MFI) and crossflow sampler-modified fouling index (CFS-MFI) devices for prediction of fouling potential in a reverse osmosis (RO)/ nanofiltration (NF) filtration system. The setting-up procedures of the laboratory-scale MFI and CFS-MFI devices operated in constant flux were described in detail. A practical approach to test the functionality of devices was also suggested. The devices are instrumented for monitoring transmembrane pressure, crossflow velocity, and flux at a desired time interval. A series of MFI const.flux and CFS-MFI const.flux tests were carried out using various types of membranes and foulants to determine the functionality and consistency of the newly developed system. The results showed that the differences between MFI const.flux and CFS-MFI const.flux values were more significant for high polydispersed foulants (e.g., 70-100 nm colloidal silica and Aldrich humic acid) than monodispersed foulants (e.g., 22 nm particle colloidal silica). When using the polydispersed foulants, the CFS-MFI const.flux showed a better agreement with actual RO fouling trend than the MFI const.flux. These observations proved that with the presence of CFS cell, the CFS-MFI const.flux is capable of simulating a more realistic RO fouling behaviour than the MFI const.flux value (without the consideration of crossflow effect). The successful setting-up of the fouling prediction devices in this study would provide a useful guide for future researchers on the fouling potential of membrane.

Research paper thumbnail of Review of the effect of selected physicochemical factors on membrane fouling propensity based on fouling indices

Desalination, 2012

Membrane fouling is one of the major drawbacks for membrane-based technologies because it leads t... more Membrane fouling is one of the major drawbacks for membrane-based technologies because it leads to severe flux decline which requires the fouled membrane to be cleaned and replaced on a regular basis. A systematic approach that is capable of providing early diagnosis is essential to control membrane fouling. Fouling index is a measure for fouling propensity of water in reverse osmosis applications. The present paper focuses on the review from the existing literature of the various fouling indices, i.e. SDI and MFI associated with a number of selected physicochemical factors. Despite of the fact that the membrane fouling problems and their forming mechanisms have been studied by numerous researchers, the evaluation on the contributing factors towards the fouling propensity is still remained unclear. Membrane fouling propensity can be influenced by: membrane morphology (i.e. surface porosity, membrane material, membrane hydrophobicity, membrane molecular cutoff , pore size), feedwater composition (i.e. ionic strength, pH, types and concentrations of feed), and hydrodynamic conditions (i.e. crossflow velocity, permeate flux and temperature). These factors were discussed in great detail in the present review.

Research paper thumbnail of Recycling of oleochemical wastewater for boiler feed water using reverse osmosis membranes — A case study

Desalination, 2011

Currently, awareness of water conservation has increased worldwide due to water scarcity. Wastewa... more Currently, awareness of water conservation has increased worldwide due to water scarcity. Wastewater recycling appears to be attractive for water conservation. This paper addresses a case study of oleochemical wastewater treatment using an advanced process that comprises ...

Research paper thumbnail of Comparative Assessment of Membrane Fouling Propensity Using Colloidal Silica as Foulant

Applied Mechanics and Materials, 2012

Other than silt density index (SDI), modified fouling index (MFI) is claimed as one of most usefu... more Other than silt density index (SDI), modified fouling index (MFI) is claimed as one of most useful fouling predictive tools in the practice of reverse osmosis. In this study, the effect of colloidal silica particles on the MFI value with the presence of crossflow sampler (CFS) cell at the upstream of MFI setup was systematically investigated. Colloidal silica with the particle size ranging from 70-100 nm was used as the model foulant in this experiment. The feed silica suspension was 0, 50, and 200 mg/L. The effect of membrane pore size as the test membrane in the dead-end cell on the fouling indices was also studied. Polyvinylidene fluoride (PVDF) membranes with molecular weight cut-offs of 150 and 100 kDa were employed. As predicted, the experiment results demonstrated that the fouling indices increased significantly as the feed silica concentration increased. The CFS-MFI values were always lower than the MFI in all the fouling index tests due to the shear force effect generated u...