Conference Publications

Permanent URI for this collection

https://hdl.handle.net/20.500.14170/193

Browse

Browsing Conference Publications by Department "Universiti Malaysia Perlis"
  • Publication
    A mini-review of coupled convection-diffusion equations in a fixed-bed adsorption
    (IOP Publishing, 2020)
    Nurhusnina Mohd Supian
    ;
    Norzilah Abdul Halif
    ;
    Nursalasawati Rusli
    Environmental contamination triggered by dyes has gained global attention. Industrial effluent of dye in high concentration into the rivers must be reduced to minimise the harmful effect on the quality of water that threatens human health. The removal of dye from wastewater is a significant step in addressing the problem of dye emission which can be achieved through adsorption separation technologies. In the most adsorption process, the adsorbent is in contact with fluid in a fixed bed. The performance of adsorptive separation of dye can be predicted through a fixed bed mathematical model which consists of coupled partial differential equations for optimizing the design and operating conditions. This paper presents a mini-review of mathematical modelling of fixed-bed adsorption of dye. The discussions are limited to the used of single component-dye separation in, convection-diffusion equations coupled with Langmuir isotherm. Besides, the numerical methods used for solving the convection-diffusion equations are also discussed in this paper.
      1  3
  • Publication
    Bioengineering technologies used for the development and equipment of complex installations to obtain energy from three renewable sources. Complex installations for coastal areas
    (IOP Publishing Ltd, 2020)
    George Poteras
    ;
    Gyorgy Deak
    ;
    Andreea-Georgiana Baraitaru
    ;
    Marius Viorel Olteanu
    ;
    Nata’lia Simona Raischi
    ;
    Dewi Suriyani Che Halin
    Considering that the production of energy from fossil sources causes environmental pollution, increasing health hazards or climate change, the research for new alternative energy sources and the development of high-performance renewable energy conversion systems are a basic concern nowadays. Thus, the development and the use of renewable energy sources can increase diversity in energy supply markets, help to ensure long-term sustainable energy resources, to reduce local and global air emissions, and provide commercial attractive options to meet the specific needs of energy services. This paper aims to improve the efficiency of a patented complex installation which was developed vertically to ensure high-energy efficiency in relation to the occupied area, that integrates three renewable energy sources (wind, solar and hydro), by applying bioengineering solutions. Improvements to the original installation consisted in modifying the initial characteristics of the off-shore system (number of slots, deflectors angle, width of slots and width of deflectors), modification of aerial module blades according to the bioengineering model of the thistle seed (Carduus nutans), and modification of the submerged module paddies according to the bioengineering model of a fish species swimmers. Following the tests performed on the modified complex installation, a major improvement of the energy efficiency compared to the (initial) control installation was observed.
  • Publication
    Bioprotein optimization from spent mushroom substrate for fish feed application
    (AIP Publishing, 2020)
    Nuradibah Mohd Amer
    ;
    Z. Masyitah
    ;
    Sam Sung Ting
    ;
    Khairul Farihan Kasim
    ;
    Nik Noriman Zulkepli
    ;
    Omar S. Dahham
    ;
    Saad S. Dahham
    The utilization of spent mushroom substrate as potential substrate for bioprotein production is being explored in this study. The objectives of this study were to screen three different types of fungi in bioprotein production from spent mushroom substrate and to optimize the process condition of the best fungi for production of bioprotein by using Design Expert Software. In this present study, screening of three different strains; Aspergillus terreus UniMAP AA-1, Aspergillus niger (ATCC 16404) and Phanerochaete chrysosporium (ATCC 24725), was done for bioprotein production by solid state fermentation process. P. chrysosporium produced the highest amount of protein on the sixth day, with the amount of 0.3951 mg/mL. Optimization of two parameters; substrate concentration and inoculum size for the selected fungi, P. chrysosporium was done conducted by Response Surface Methodology (RSM): Central Composite Design (CCD) to investigate optimal condition of bioprotein production. The optimum condition for P. chrysosporium to produce bioprotein using SMS was achieved at 60% of substrate concentration and 15% (w/v) of inoculum size with maximum protein concentration of 0.3812 mg/mL.
  • Publication
    Botanical insecticide of chili and ginger extract on Nilaparvata lugens, brown planthopper
    (IOP Publishing Ltd., 2020)
    Noor Hasyierah Mohd Salleh
    ;
    Norhidayah Abd Aziz
    ;
    Alina Rahayu Mohamed
    ;
    Adilah Anuar
    ;
    I Nur Humaira
    Invasion of Nilaparvata lugens or brown planthopper (BPH) in paddy fields has led to the use of excessive chemical insecticides due to its effectiveness. However, excessive applications has contributed several negative effects on the environment, farmers as well as non-targeting organisms. As an alternative, a mixture of a botanical insecticide containing mixture of chili and ginger extracts have been studied. Three parameters were studied namely the extract concentration, time of exposure and temperature of exposure. The results showed that 90% of BPH mortality was found at 40% extract concentration with 72 hr duration time of exposure at optimal temperature 30 C. HPLC analysis proved the presence of capsaicin and gingerol at peaks of 4.502 min and 11.046 min respectively. From repellency analysis, the BPH showed selective repel action against the treated paddy. This is due to the pungent odor contributed from compound of gingerol, shogaol and capsaicin presented in the mixture. Meanwhile, contact toxicity studies have successfully give 100% of mortality of BPH. Microscopic analysis have shown BPH deformities was increased by the extract concentration.
      3  16
  • Publication
    Characterization and coagulation performance of poly ferric silicate sulfate from rice husk ash
    (AIP Publishing, 2020)
    Nor Fauziah Zainudin
    ;
    Sam Sung Ting
    ;
    Nik Noriman Zulkepli
    ;
    Omar S. Dahham
    ;
    Ainun Nisa Ganul
    ;
    Wong Yee Shian
    ;
    Hanafi Ismail
    Rice husk ash which mostly made up of silica is valuable material for use in industrial applications including production of sodium silicate. Different methods to extract SiO2 from rice husk ash was conducted and the best method was used to prepare poly ferric silicate sulfate coagulant. The prepared coagulant was characterized by using FTIR and SEM. In the coagulation-flocculation process, poly ferric silicate sulfate prepared shows better coagulation performance compared to commercialized polyacrylamide in terms of turbidity removal at three levels of turbidity.
  • Publication
    Chloroplast DNA sequence of trnR-N and trnL-F regions in Harumanis mango from different orchards in Perlis, Malaysia
    (IOP Publishing Ltd, 2020)
    Ahmad Mukhlis Abdul Rahman
    ;
    SFM Sabri
    ;
    Yusuf, Arbai
    ;
    Zarina Zakaria
    ;
    SV Kumar
    Harumanis is a premium mango cultivar widely known for its sweet taste, aroma and vibrant flesh colour. To date, the genetic identification of this mango based on multiple conserved DNA region using samples from different orchards has never been reported. The aim of this research is to identify the genetic signature of Harumanis mango at molecular level by analyzing chloroplast DNA sequences of the trnL-F and trnR-N regions. DNA samples were extracted from a total of 15 Harumanis samples collected from five selected orchards using Cetyl Trimethyl Ammonium Bromide (CTAB) extraction procedure. The extracted DNA and the PCR-amplified products were analyzed through gel electrophoresis and were then subjected to DNA Sequencing and in silico analysis. The obtained sequences were compared with the sequences available in the GeneBank. BLAST search for both the trnR-N and trnL-F regions confirmed that all the 15 samples belong to Mangifera indica with a 99% sequence identity. In addition, the trnL-F sequences were 99% identical to a number of specific mango cultivars such as, Tommy and Arunika. However, the trnR-N sequences were less informative as it gave hits to only two mango accessions (e.g. Mangifera indica voucher PDBK 2014-0249). It is postulated that the plastid trnR-N may be a potential candidate region for the development of the Harumanis genetic signature. The results may be used to complement other molecular data for the development of a genetic barcode for Harumanis.
      1  17
  • Publication
    Coagulation-flocculation process for turbidity removal using alum sludge from water treatment plant
    (AIP Publishing, 2023)
    J. H. Chan
    ;
    Nor Aida Yusoff
    ;
    Noor Ainee Zainol
    ;
    Nor Munirah Rohaizad
    ;
    Khairunissa Syairah Ahmad Sohaimi
    The aim of this research was to utilize alum sludge, also known as water treatment residual (WTR) from water treatment plant for preparing sludge reagent product (SRP) as coagulant in removing turbidity of kaolin suspension and river water. The WTR was characterized by examine the inorganic component (functional group, and surface morphology using X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscope (SEM) respectively. WTR had an amorphous structure and contained high aluminum metal constituents with 35.4 %, which can be recovered as coagulant. Acidification was conducted to recover these aluminium in WTR by using sulphuric acid and produced SRP. The optimum condition of SRP prepared from WTR was evaluated through parameters such as sludge concentration, normality and dosage of acid. It has been observed that 1 % sludge concentration acidified with 0.08 ml/ml sludge and 2.0 N H2SO4 of SRP gave the maximum percentage turbidity removal of 99.46 %. The performance of SRP in coagulation-flocculation process by using a standard jar test was studied based on the effect of pH, kaolin concentration, and SRP dosage. The highest percentage turbidity removal (99.79 %) was obtained at pH 7, kaolin concentration of 800 mg/L, and SRP dosage of 80 mg/L. The SRP performance was also compared to alum coagulant. The percentage turbidity removal of river water for both coagulants were almost similar, with 90.60 % for SRP and 91.18 % for alum respectively. Thus, SRP has the potential to replace commercial coagulant in water treatment plant in terms of costing and sustainability.
  • Publication
    Coconut husk based Lignosulfonate as sacrificial agent in surfactant flooding
    (AIP Publishing, 2023)
    Nik Muhammad Azhar Nik Daud
    ;
    Wan Muhammad Kamal Wan Jaafar
    ;
    Norhisyam Ismail
    ;
    Muhamad A. Manan
    ;
    Ahmad Kamal Idris
    ;
    Radzuan Junin
    Surfactant flooding is one of the techniques in chemical enhanced oil recovery (CEOR). The purpose of this technique is to reduce the interfacial tension between brine and oil in the reservoir so that the oil can be mobilized to the production well. However, the surfactant tends to adsorb on the rock minerals making it less efficient. The adsorption can be minimized by using three methods: matching surfactant type to specific reservoir rock by surface charge, application of surfactant mixtures to enhance the surfactant capability and using a sacrificial adsorbate to block the adsorption site on the rocks. This study will focus on utilizing the lignosulfonate (LS) from coconut husk as a sacrificial agent to increase the efficiency of surfactant flooding. Lignin was extracted from coconut husk before sulfonated using sodium sulphite, Na2SO3 to form lignosulfonate. FTIR was used to characterize the lignin and lignosulfonate and compare them with the commercial product. The oil (paraffin) displacement experiment was then conducted using 5% illite and 95% sand to simulate Malaysia's sandstone reservoir mineral composition. Two types of surfactant were studied; anionic (Sodium Dodeclyl Sulfate-SDS) and nonionic (4-octylphenol polyethoxylate-TX100). The percentage of oil recovery was calculated based on the volume of oil recovered from the original oil in place (OOIP). The displacement tests show that oil recovery was increased from 2.52% to 3.10% for SDS after the preflush and from 1.36% to 2.00% for TX100 after preflush with LS. This increase corresponds to 23.6% and 47.1% increments in oil cerovery from the test without preflush, respectively. These results have shown that the LS has the potential to be used as a sacrificial agent to increase the efficiency of surfactant flooding.
      4  18
  • Publication
    Combination of biological and hydrothermal pretreatment of mixed rice biomass for fermentable sugars production
    (IOP Publishing, 2020)
    Ang Kian Thing
    ;
    Saleha Shamsudin
    Rice biomass is one of the most staple agricultural by-products in Malaysia. In this study, mixed rice biomass (MRB) which combines rice husk and straw in certain ratio was used to produce the fermentable sugars. White-rot fungal strain, P.chrysosporium was used in biological pretreatment for 7 days (30°C). The pretreatment was proceeded by hydrothermal autohydrolysis for further removal of hemicellulose. The reducing sugar of soluble solid mixed rice biomass after autohydrolysis process was determined (0.225g sugar/g MRB). The characteristic of raw and insoluble solid pretreated MRB was observed by Scanning Electron Microscopy (SEM) and the functional groups changes were determined by Fourier Transformed Infrared (FTIR). The parameters of enzymatic saccharification were optimized using Central Composite Design for Response Surface Methodology by setting the concentration of commercial cellulase enzyme used, Celluclast 1.5L from 5 FPU/g to 15 FPU/g and incubation times from 24 to 72 hours. It was discovered that fermentable sugars production was increased from 0.098g sugar/g MRB (0.125 g/L) to 0.248g sugar/g MRB (0.319g/L) at optimized condition 82 hours incubation time and 10 FPU/g enzyme concentrations. Hence, the total reducing sugar produced was calculated as 0.473g sugar/g MRB and saccharification was determined as 66.31%.
      12  1
  • Publication
    Comparative study of various pretreatment on sugar production from mixed rice biomass
    (IOP Publishing, 2020)
    Lau Cheng Yee
    ;
    Saleha Shamsudin
    ;
    Khairul Farihan Kasim
    The aim of this work was to study the effectiveness of pretreatment methods by developing a comparative study of diluted acetic acid and hydrothermal pretreatment on reducing sugar production and inhibitors formation (Furfural) from the mixed rice biomass. Diluted acetic acid and hydrothermal pretreatment were carried out over a range of temperature (150 – 190 ºC) within 30 minutes to observe the reducing sugar production and inhibitor formation (Furfural). Seamen Model was used to obtain the rate of reaction in depolymerisation of lignocellulosic biomass. This experiment data were fitted the first-order kinetic model to obtain the reaction rate constant of production and degradation of sugar. In addition, Arrhenius equation was used to determine the activation energy of the reaction. From the result, it showed that the diluted acetic acid pretreatment had higher rate on reducing sugar production and inhibitor formation than the hydrothermal pretreatment. The activation energy for the formation sugar in hydrothermal pretreatment is found 29.1 kJ/mol which is higher than acetic acid pretreatment (23.9 kJ/mol).
  • Publication
    Comparative study on mechanisms of gases release from Ca-alginate beads
    ( 2024)
    Yee-Ming Peh
    ;
    Lee Boon Beng
    ;
    Farizul Hafiz Kasim
    ;
    Akmal Hadi Ma’Radzi
    ;
    Ahmad Radi Wan Yaakub
    ;
    Hafizah Mohd Johar
    ;
    D.F.A. Riza
    ;
    N. Izza
    ;
    K. Gustinasari
    ;
    I.K. Maharsih
    ;
    W.B. Sunarharum
    ;
    M. Nurcholis
    ;
    B.S.D. Dewanti
    ;
    V.T. Widayanti
    ;
    E. Mufidah
    ;
    I. Qisthiya
    ;
    D. Karadag
    ;
    S. Idrus
    ;
    H. Umakoshi
    ;
    Y.C. Lee
    ;
    D. Fatchurrahman
    ;
    M. Zhu
    ;
    K.A. Omwange
    ;
    T. Addini
    Calcium alginate (Ca-alginate) beads have attracted considerable attention as carriers for the controlled release of volatile compounds due to their biocompatibility and tunable properties. This study aimed to compare the release of ethylene and carbon dioxide gas from Ca-alginate beads. Ca-alginate beads were prepared from a sodium alginate solution containing ethephon and calcium carbonate as the gas-forming agent. The resulting solution was then extruded into a calcium chloride solution. The gas release behavior was studied by monitoring the concentration of released gases over time using gas detectors. Extrusion tip diameter, alginate concentration and gas-releasing agent concentration were systematically varied to assess their effect on the gas release rate. The results indicated distinct release patterns for ethylene and carbon dioxide gas. Ethylene gas exhibited a relatively slower and sustained release, while carbon dioxide gas exhibited a more rapid release. Moreover, the bead size influenced the gas release, with larger beads displaying faster release rates for ethylene and carbon dioxide gas. The concentration of alginate also played a role in modulating the release kinetics, with higher alginate concentration resulting in slower gas release. The findings have implications for designing and optimizing Ca-alginate-based systems for agricultural applications, including plant hormone delivery and modified atmosphere packaging.
      1  32
  • Publication
    Deep eutectic solvent for extraction of natural antioxidant from a medicinal plant, Coleus aromaticus
    (IOP Publishing, 2020)
    Ahmad Anas Nagoor Gunny
    ;
    Tay Wee Xiang
    ;
    Mohd Hishamuddin Che Mat
    Antioxidant is a basic requirement for maintaining good health. In this research, natural antioxidant was extracted from C. aromaticus by using different types of synthesized deep eutectic solvents (DES). The extracts were analysed using total phenolic content assay and DPPH radical scavenging assay. Finally, HPLC and FTIR methods were employed to check the present of target compounds. From the result obtained, the best DES was ChCl : glycerol with a ratio of 1:4 bearing 97.25 µg/ml of total phenolic content. The bioactive compounds that were successfully identified through HPLC and FTIR assays were Rosmarinic acid, Caffeic acid, Gallic acid and Quercetin. This shows DES is a potential green solvent to extract bioactive compounds present in medicinal plants.
      1  11
  • Publication
    Design of load control system using DTMF
    (IOP Publishing, 2020)
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Mohd Zamri Hasan
    ;
    Ahmad Muhyiddin Yusof
    ;
    Ahmad Shukri Fazil Rahman
    In agricultural sectors, one of the problems faced by the farmer is the water usage for watering schedule sometimes was wasted. With inefficient irrigation system, the water wastage could occur and resulting the excessive moisture for the soil and damaging the crops. The load control system in agricultural sectors especially for irrigation system is very important since it can affect the efficiency and the productivity of the operationsThe agricultural sectors also have many latest technologies implemented to the system such as irrigation system, temperature and humidity detection system and many other systems in order to operate efficiently so it can give profitable outcome. So, a desired load control system using Dual-Tone Multiple Frequency (DTMF) will be design for irrigation system in order to overcome the inefficiency of manual irrigation system. By using DTMF to control the irrigation system, it will consume less time and it can be control in a wide range. Firstly, by using Arduino IDE software, the coding for this control system is written with C++ language. Then, it will be compiled to make sure the coding working without any errors before it is uploaded into the Arduino Uno board. The coding will then be uploaded by connecting the Arduino Uno board to the computer via USB. Next, the schematic layout design of this control system will be simulated using Proteus 8 and Fritzing software. After the simulation of the circuit is successful, the construction of the hardware will take place. The hardware of this load control system that be assembled first is connecting the cell phone to the DTMF decoder by using 3.5mm jack. Then, from the DTMF decoder it will be connected to the Arduino Uno board. The 4 channel 12V relay then connected to the output port of the Arduino Uno. In conclusion, this irrigation control system works when the user sent the signal using cell phone and it will be received by the other cell phone that attach to the DTMF decoder
      38  3
  • Publication
    Durability properties of demineralized and torrefied Empty Fruit Bunch (EFB) pellets
    (IOP Publishing, 2020)
    Alina Rahayu Mohamed
    ;
    Ras Izzati Ismail
    ;
    Rashid, Mohammad Abdur
    ;
    Khairunissa Syairah Ahmad Sohaimi
    ;
    N N Kasim
    ;
    R Badlishah Ahmad
    The pelletization of raw and demineralized and torrefied empty fruit bunch (TDEFB) were conducted upon mixing with bio-oil that was obtained from EFB pyrolysis. The ratio of bio-oil addition to raw and TDEFB was varied from 0-20 wt%. Then it was pressed using the single pellet press machine. The effects of the ratio of bio-oil addition to raw and TDEFB and the thickness of pellets were evaluated towards its durability. It was identified that the ratio of bio-oil addition to raw and TDEFB pellet of 5 wt% had produced the optimum durability which was 69.27 and 74.46 % respectively. In terms of the thickness of the raw and torrefied pellets, it was determined that at thickness of 3 cm, the durability was the highest which were 70.12 and 71.12 % for both raw and TDEFB pellets respectively. The raw and TDEFB pellets were analysed using Fourier Transform Infra-Red (FTIR) spectroscopy in order to evaluate the presence of functional groups within the materials. The presence of O-H hydroxyl group, C=O from carbonyl or ester and C-H alkane groups are detected in both raw and torrefied pellets.
  • Publication
    Dynamic vulcanization of Polypropylene / natural rubber blends filled with Cyperus Odoratus
    (IOP Publishing, 2020)
    Norfatulikmah Zainal Abidin
    ;
    Mohamad Kahar Ab Wahab
    A new thermoplastic blend was developed using polypropylene (PP) with natural rubber (NR) as the base material. The natural filler is added to enhance the properties of PP/NR blend. The first series was to compare the properties of PP/NR blend with different filler loading. Second series was to investigate the effect of dynamic vulcanization on the properties of PP/NR blend filled with Cyperus Odoratus with the intention of improving the blend properties. Process development, tensile properties, thermal analysis, FTIR analysis and morphological characterization of blends were investigated with the variation of the conditions of the blend. The increasing filler loading decrease the tensile properties of the PP/NR blend and it shows in the morphology study of the blend. Dynamic vulcanization of the blend resulted in improved tensile and thermal properties compared to unvulcanized counterpart. This result is confirmed by the SEM study that showed better dispersion of NR in the PP matrix and improved adhesion between the two phases.
  • Publication
    Effect additions Zn on Sn-0.7Cu lead-free solder: a short brief
    (IOP Publishing, 2020)
    Fatin Sufina Mohd Tarmizi
    ;
    Mohamad Najmi Masri
    ;
    Muhammad Firdaus Mohd Nazeri
    ;
    Ahmad Azmin Mohamad
    Sn-0.7Cu lead-free solder is an alternative solder material that suitable to replace Sn-Pb solder in electronic manufacturing. However, it has a weakness of high melting temperature and lower mechanical strength. In this study, the change in microstructure, elements, the structural and melting point of Sn-0.7Cu after the addition of different compositions of Zn element was discussed. The result shows that after adding a small amount of Zn, a refinement microstructure of Sn-0.7Cu-xZn solder alloy was obtained, and the melting point of the solder decreased from 227.7 °C to 225.7 °C. Besides, the formation new phase of was investigated by scanning electron microscope (SEM) followed by energy-dispersive x-ray spectroscopy (EDX) and x-ray diffraction (XRD). Besides, the behaviour of Sn-0.7Cu-xZn solder alloy can be further studied via open circuit potential (OCP) to determine the corrosion potential.
      22  2
  • Publication
    Effect of carbonized coconut shell as a filler on tensile properties and water absorptivity of HDPE composite
    (AIP Publishing, 2023)
    Loh Shao Tee
    ;
    Nor Munirah Rohaizad
    ;
    Nor Aida Yusoff
    ;
    Khairunissa Syairah Ahmad Sohaimi
    ;
    Noor Ainee Zainol
    Generation of agricultural wastes have detrimental effect to our surrounding especially visual impacts and inefficient land use. Some of these wastes are natural fibers which can be used as potential filler in composite materials. In this study, carbonized coconut shell (CCS) had been utilized as filler and it was incorporated in the high density polyethylene (HDPE) matrix to develop carbonized coconut shell filled HDPE composites. Firstly, the coconut shell powder was treated by sodium hydroxide (NaOH) with the concentration of 1, 3, 5 and 7 wt% for 2 hours. The 7 wt% treated coconut shell revealed better filler properties in the proximate analysis. Next, it was converted into carbonized coconut shell via carbonization process at 600 °C and used as filler in HDPE composites. The carbonized coconut shell filled HDPE composites with different filler loading of 5 to 20 wt% were prepared using extruder at operating conditions of 180 °C at 70 rpm of screw speed. The increase in the filler loading enhanced the tensile strength and the Young’s modulus of the filled HDPE composite. However, the elongation at break of the composite was observed to decrease with an increasing in the filler loading. There are some voids observed in the HDPE/CCS5 composites while good surface adhesion was presented in HDPE/CCS15 composites. The water uptake by the composites was observed to be increased with the filler loading. In conclusion, the optimum filler loading for carbonized coconut shell filled HDPE composites was determined as 15 wt% because it imparts high tensile strength with moderate water absorption properties.
      15  2
  • Publication
    Effect of CO₂ concentration and liquid to gas ratio on CO₂ absorption from simulated biogas using Monoethanolamine solution
    (IOP Publishing Ltd, 2020)
    V Rajiman
    ;
    Hairul Nazirah Abdul Halim
    ;
    A M Shariff
    In industrial scale, removal of CO₂ by chemical absorption from raw biogas represents an imperative treatment and the cutting-edge technology towards improvement of its quality and heat value. In this work, CO₂ absorption studies were conducted in an absorption column packed with Sulzer metal gauze packing with simulated biogas absorbed using 30 wt. % of monoethanolamine (MEA) solution. Experimental works were conducted to determine the influence of different CO₂ concentrations in feed gas (30 % and 40 %) and L/G ratio (0.6 and 0.7) and subsequently assessed in terms of CO₂ absorption efficiency along the column. The results showed that 30 % CO₂ in feed gas has higher removal efficiency as compared to 40 % CO₂ with the ability to remove 94 % CO₂ during the process. In addition, the CO₂ absorption studied on the L/G ratio proved that CO₂ removal was improved at higher L/G ratio of 0.7.
      13  1