Wong Yee Shian
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Preferred name
Wong Yee Shian
Official Name
Wong, Yee Shian
Alternative Name
Wong, Yee-Shian
Wong, Y. S.
Wong, Yee Shian
Yee-Shian, Wong
Y S Wong
Main Affiliation
Scopus Author ID
56004092100
Researcher ID
M-6006-2015

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  • Publication
    Enhanced photodegradation of phenol by ZnO nanoparticles synthesized through sol-gel method
    ( 2017-12-01)
    Nik Noor Athirah Nik Yusoff
    ;
    Ho Li Ngee
    ;
    Ong Soon An
    ;
    Wong Yee Shian
    ;
    Wan Fadhilah Khalik
    ;
    Fahmi Ridzwan
    Zinc oxide (ZnO) utilization in advanced oxidation process (AOP) via solar-photocatalytic process was a promising method for alternative treating wastewater containing phenol. The ZnO photocatalyst semiconductor was synthesized by sol-gel method. The morphology of the ZnO nanostructures was observed by using scanning electron microscope (SEM) and the crystallite phase of the ZnO was confirmed by x-ray diffraction (XRD). The objective of this study was to synthesis ZnO nanoparticles through a sol-gel method for application as a photocatalyst in the photodegradation of phenol under solar light irradiation. The photodegradation rate of phenol increased with the increasing of ZnO loading from 0.2 until 1.0 g. Only 2 h were required for synthesized ZnO to fully degrade the phenol. The synthesized ZnO are capable to totally degrade high initial concentration up until 45 mg L-1 within 6 h of reaction time. The photodegradation of phenol by ZnO are most favoured under the acidic condition (pH3) where the 100% removal achieved after 2 h of reaction. The mineralization of phenol was monitored through chemical oxygen demand (COD) reduction and 92.6% or removal was achieved. This study distinctly utilized natural sunlight as the sole sources of irradiation which safe, inexpensive; to initiate the photocatalyst for degradation of phenol.
  • Publication
    Synergistic Effect Between Iron and Food/Microorganism (F/M) Ratio in Biological Wastewater Treatment
    ( 2022-01-01)
    Subramaniam L.S.
    ;
    Nabilah Aminah Lutpi
    ;
    Wong Yee Shian
    ;
    Ong Soon An
    ;
    Nazerry Rosmady Rahmat
    ;
    Siripatana C.
    Biological wastewater treatment is mainly dependent on the actions of microorganisms that can be used to treat wastewater. Microorganisms will start to stick together when they degrade the organic matter in wastewater for food and flocculate to settle the pollutants. This study aimed to investigate the effect of food to microorganism (F/M) ratio and iron in a biological process using aerobic treatment. For this purpose, four aerobic tanks (A, B, C, D) were set up using activated sludge as the seed sludge, air pump as air diffuser to provide oxygen to the system, and three litres of synthetic medium as carbon source for each tank. A specific amount of iron (II) sulfate was added into tanks B, C, and D with the weight of 3 g, 6 g, and 9 g, respectively. Tank A act as a control, and no iron dosage was added. The F/M ratio for tanks A, B, C, and D were 0.8, 0.5, 0.4, and 0.3 mg BOD/mg MLVSS, respectively. The aerobic tanks were operated for 40 days in sequential batch mode and sampling was collected four times per week to observe the COD and MLVSS. This study has found that Tank D shows the best performance compared to all tanks with 84.71% COD removal efficiency and a fivefold increment of microorganism growth rate. These findings suggest that a relationship exists between the iron and F/M ratio to enhance the aerobic treatment process.
  • Publication
    Influence of Amaranth dye concentration on the efficiency of hybrid system of photocatalytic fuel cell and Fenton process
    ( 2017-10-01)
    Noradiba Nordin
    ;
    Ho Li Ngee
    ;
    Ong Soon An
    ;
    Abdul Haqi Ibrahim
    ;
    Wong Yee Shian
    ;
    Sin Li Lee
    ;
    Oon Yoong Sin
    ;
    Oon Yoong Ling
    A novel sustainable hybrid system of photocatalytic fuel cell (PFC) and Fenton process is an alternative wastewater treatment technology for energy-saving and efficient treatment of organic pollutants. The electrons generated from PFC photoanode are used to produce H2O2 in the Fenton reactor and react with the in situ generation of Fe2+ from sacrificial iron for hydroxyl radical formation. In this study, the effect of different initial Amaranth dye concentrations on degradation and electricity generation were investigated. ZnO/Zn photoanode was prepared by anodizing method and characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). Results revealed that the maximum power density (9.53 mW/m2) and current density (0.0178 mA/m2) were achieved at 10 mg/L of Amaranth. The correlation between dye degradation, voltage output, and kinetic photocatalytic degradation were also investigated and discussed.
  • Publication
    Biohydrogen production from palm oil mill effluent with Moringa Oleifera seeds as support carrier in attached growth system
    ( 2020-06-10)
    Hamid W.Z.W.A.
    ;
    Nabilah Aminah Lutpi
    ;
    Wong Yee Shian
    ;
    Ong Soon An
    ;
    Malek M.A.
    Biohydrogen production by dark fermentation is one of the attracting alternatives for renewable energy in worldwide. By employing immobilized cells, hydrogen production and cell density could be improved. This study aimed to investigate the efficiency of Moringa Oleifera Seeds (MOS) immobilized cells in enhancing the biohydrogen production using repeated batch fermentation under mesophilic condition, 37°C. The efficiency of MOS as support carrier, effect of the initial pH (5.0-7.0) and performance of raw and diluted Palm Oil Mill Effluent (POME) using MOS immobilized cells were investigated using anaerobic sludge as inoculums. The cumulative hydrogen production results were fitted into a modified Gompertz equation to find the maximum hydrogen production. MOS immobilized cells was more efficient in producing hydrogen compare to suspended cells (without MOS). The optimal pH obtained using MOS immobilized cells was found to be at pH 6 using raw POME with the maximum hydrogen production (Hm) of 122 mL, the maximum hydrogen production rate (Rm) of 39.0 mL/h, and 560 ppm of hydrogen concentration.
  • Publication
    Plastics in Water Treatment
    ( 2022-01-01)
    Nor Fauziah Zainudin
    ;
    Sam Sung Ting
    ;
    Wong Yee Shian
    ;
    Ismail H.
    Water is essential for many people around the world and needs to be conserved. Recently water shortages are becoming severe and urgent issues to be addressed due to the global population growth coupled with rapid economic developments. Water is considered contaminated when the presence of elevated concentrations of substances in water exceeds the prescribed limits. More efficient water treatments need to be developed to address the worsening clean water shortage. Water treatment facilities made from plastic materials proven to offer more advantages compared to alternative materials. Their unique properties such as lightweight, strength, chemical and corrosion resistance, weather and fire resistance, easy and long-lasting installations contribute to the excellent applications of the water treatment system. Plastic provides many solutions for ensuring the sustainability of water. The choice of plastic types of materials depends on their specific applications. In this article, we introduce different types of plastic and its advantages. The plastic applications in water treatments were also discussed in different fields of human activities such as in water and sewage treatments, irrigation and agriculture, potable water production, aquaculture and ultra-pure water production.
  • Publication
    Decolorization and mineralization of Amaranth dye using multiple zoned aerobic and anaerobic baffled constructed wetland
    ( 2017-08-03)
    Harvinder Kaur Lehl
    ;
    Ong Soon An
    ;
    Ho Li Ngee
    ;
    Wong Yee Shian
    ;
    Farah Naemah Mohd Saad
    ;
    Oon Yoong Ling
    ;
    Oon Yoong Sin
    ;
    Thung Wei Eng
    ;
    Yong Chin Yii
    The objective of this study is to determine the reduction efficiency of Chemical Oxygen Demand (COD) as well as the removal of color and Amaranth dye metabolites by the Aerobic–anaerobic Baffled Constructed Wetland Reactor (ABCW). The ABCW reactor was planted with common reed (Phragmite australis) where the hydraulic retention time (HRT) was set to 1 day and was fed with synthetic wastewater with the addition of Amaranth dye. Supplementary aeration was supplied in designated compartments of the ABCW reactor to control the aerobic and anaerobic zones. After Amaranth dye addition the COD reduction efficiency dropped from 98 to 91% while the color removal efficiency was 100%. Degradation of azo bond in Amaranth dye is shown by the UV–Vis spectrum analysis which demonstrates partial degradation of Amaranth dye metabolites. The performance of the baffled unit is due to the longer pathway as there is the up-flow and down-flow condition sequentially, thus allowing more contact of the wastewater with the rhizomes and micro-aerobic zones.
  • Publication
    Innovative baffled microbial fuel cells for azo dye degradation: Interactive mechanisms of electron transport and degradation pathway
    ( 2021-05-01)
    Oon Y.S.
    ;
    Ong Soon An
    ;
    Ho Li Ngee
    ;
    Wong Yee Shian
    ;
    Oon Y.L.
    ;
    Lehl H.K.
    ;
    Thung W.E.
    Two membrane-less baffled microbial fuel cells (BMFCs) were developed for non-dye (BMFC1) and dye degradation (BMFC2) investigations along with simultaneous bioelectricity generation. The influence of salinity, organic loading, circuit connection, aeration rate, dye concentration and addition of intermediates on BMFCs performances were evaluated systematically. The increase of salinity by 3-fold (0.39 g/L of NaCl) lowered the internal resistance of BMFC1 system by 38%–620 Ω, and the power density increased 49% to 10.55 ± 0.86 mW/m2. While the further increase of salinity (10-fold) adversely affected BMFC1. The power performance of BMFC1 improved with higher organic loading. Whereas, the increment in organic loading enhanced the decolourisation efficiency but deteriorated the power performance of BMFC2 ascribed to the competition between New Coccine (NC) molecules and anode for electrons. This finding corroborates that NC was a preferable electron acceptor than the anode. The addition of 50 mg/L NC increased the power density by 53% to 12.40 ± 1.60 mW/m2, which revealed that NC decolourised intermediates could act as the electron mediator, hence led to the increase of power performance. The electron-mediating mechanism of NC decolourised intermediate, 1-amino-2-naphthol-6,8-disulfonate as electron shuttle was unveiled. The in-depth understanding of the mechanisms involved in dye degradation in MFCs was presented, where a comprehensive degradation pathway of NC was proposed based on the intermediates identified via UV–Visible spectra, Fourier-transform infrared spectroscopy (FTIR), high-performance liquid chromatography (HPLC) and gas chromatograph-mass spectrometer (GC-MS) analyses.
  • Publication
    Transformation from biofiltration unit to hybrid constructed wetland-microbial fuel cell: Improvement of wastewater treatment performance and energy recovery
    ( 2023-05-01)
    Teoh T.P.
    ;
    Koo C.J.
    ;
    Ho Li Ngee
    ;
    Wong Yee Shian
    ;
    Nabilah Aminah Lutpi
    ;
    Tan S.M.
    ;
    Yap K.L.
    ;
    Ong Soon An
    This study aimed to compare the performance of biofiltration, constructed wetland, and constructed wetland microbial fuel cell (CW-MFC). The transformation from a biofiltration unit to a hybrid CW-MFC was demonstrated with the advantages of improvement of wastewater treatment while generating electricity simultaneously. The introduction of plants to the upper region of the bioreactor enhanced the DO level by 0.8 mg/L, ammonium removal by 5 %, and COD removal by 1 %. The integration of electrodes and external circuits stimulated the degradation rate of organic matter in the anodic region (1 % without aeration and 3 % with aeration) and produced 5.13 mW/m3 of maximum power density. Artificial aeration improved the nitrification efficiency by 38 % and further removed the residual COD to an efficiency of 99 %. The maximum power density was also increased by 3.2 times (16.71 mW/m3) with the aid of aeration. In treating higher organic loading wastewater (3M), the maximum power density showed a significant increment to 78.01 mW/m3 (4.6-fold) and the COD removal efficiency was 98 %. The ohmic overpotential dominated the proportion of total loss (67-91 %), which could be ascribed to the low ionic conductivity. The reduction in activation and concentration loss contributed to the lower internal resistance with the additional aeration and higher organic loading. Overall, the transformation from biofiltration to a hybrid CW-MFC system is worthwhile since the systems quite resemble while CW-MFC could improve the wastewater treatment as well as recover energy from the treated wastewater.
  • Publication
    Kinetic model discrimination on the biogas production in thermophilic co-digestion of sugarcane vinasse and water hyacinth
    ( 2022-08-01)
    Audrey Chai Yee Chieh
    ;
    Wong Yee Shian
    ;
    Ong Soon An
    ;
    Nabilah Aminah Lutpi
    ;
    Sam Sung Ting
    ;
    Kee W.C.
    ;
    Eng K.M.
    Co-digestion between sugarcane vinasse (Vn) and water hyacinth (WH) at various mixing ratios of 0:1, 1:0, 1:3, 3:1, and 1:1 was carried out under thermophilic conditions (55 Â°C) for 60 days. The effect of various mixing ratios on the pH changes, soluble chemical oxygen demand (sCOD) reduction, and cumulative biogas production was investigated. The first order, modified Gompertz, and logistic function kinetic models were selected to fit the experimental data. Model discrimination was conducted through the Akaike Information Criterion (AIC). The study revealed that co-digestion shows better performance compared to the mono-digestion of both substrates. Vn:WH mixing ratio 1:1 with inoculum to substrate ratio (ISR) of 0.38 g VSinoculum/g VSsubstrate is the most favorable ratio, achieving sCOD reduction efficiency and cumulative biogas production of 71.6% and 1229 mL, respectively. Model selection through AIC revealed that ratio 1:1 was best fitted to the logistic function kinetic model (R2 = 0.9897) with Ym and K values of 1232 mL and 31 mL/day, respectively.
  • Publication
    Comparative study on the biodegradation of mixed remazol dyes wastewater between integrated anaerobic/aerobic and aerobic sequencing batch reactors
    ( 2017-09-01)
    Ong Soon An
    ;
    Ho Li Ngee
    ;
    Wong Yee Shian
    ;
    Khairil Anuar Mohammad Pakri
    Complete mineralization of dye effluent was realized through sequential anaerobic followed by aerobic processes. The aim of this study was to evaluate and compare the degradation of wastewater of four remazol dyes with integrated anaerobic/aerobic (SBR1) and aerobic (SBR2) processes under sequencing batch reactor operation. The ORP profiles show that the SBR1 was in anaerobic condition during the 15 h React mode and turned to aerobic condition through air aeration for 3 h. The SBR1 and SBR2 achieved almost similar performance in the removal of organic compounds with average 95% COD removal. The SBR1 performed better in the color removal with 93% removal efficiency while the SBR2 only attained 50% removal efficiency. The biodegradation rate of the remazol dyes was well described by the first-order kinetic model with the sequence degradation rate remazol pink > remazol violet > remazil yellow > remazol green.