Mardhiah Farhana Omar
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Preferred name
Mardhiah Farhana Omar
Official Name
Mardhiah Farhana, Omar
Alternative Name
Omar, Mardhiah Farhana
Omar, M. F.
Main Affiliation
Scopus Author ID
57195442737
Researcher ID
DTV-3341-2022

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  • Publication
    Performance of sequencing batch reactor for the removal of chemical oxygen demand from waste cooking oil
    ( 2022-06-01)
    Abdul Rashid N.B.
    ;
    Abdul Latif Abdul Rani
    ;
    Mardhiah Farhana Omar
    ;
    Muhd Afiq Hizami Abdullah
    ;
    Permana Putri E.B.
    ;
    Syafiuddin A.
    The production of highly polluted waste cooking oil (WCO) that contains both inorganic and organic compounds has been increased in Malaysia particularly in food industries. This study was aimed to utilize a sequencing batch reactor (SBR) in order to investigate the aerobic treatment of WCO. The system was operated at pH ranging from 4 to 5 and temperature ranged from 25°C to 31°C. The SBR reactor was fabricated using Perspex with a working volume of 2 L. Experiments were con-ducted daily at fill, react, settle, draw, and idle phase at 1, 1, 2, 1, and 1 h, respectively. The chemical oxygen demand (COD) and turbidity were assessed in determining SBR performance. Highest COD removal and turbidity values were at 67% and 0.94 NTU, respectively. A stable effluent quality was achieved after 13 d of operational investigation. In general, the SBR treatment was able to achieve acceptable discharge limit for the final treated effluent.
      2  34
  • Publication
    Aerobic granules cultivated using industrial rubber wastewater: Effect of size distribution and Performance of granules.
    ( 2020-12-18)
    Najihah Abdul Rashid
    ;
    Abdul Latif Abdul Rani
    ;
    Mardhiah Farhana Omar
    ;
    Muhd Afiq Hizami Abdullah
    Sequential batch reactors (SBR) have been successfully developed granular sludge using industrial rubber wastewater on a cylindrical shaped SBR. SBR was introduced to industrial wastewater with varying chemical oxygen demand (COD) loadings from as low as 0.01 to 0.28 kgCOD/m3/d. First phase of experiment utilized 24 hours cycle time whilst second phase of experiment utilized 4 hours cycle time. Granules were successfully developed at the second phase (4 hours) of experiment. Fortunately, the overall performance for both cycles were excellent. COD removal efficiency throughout the experiment was kept at about 78 % to 98 %. Although higher COD removal was observed for both cycle, granulation did not occur in the first phase (24 hours). Decrement of cycling time to 4 hours promotes the growth of dense and structured sludge granules.
      5  28
  • Publication
    Competitiveness of Industrialised Building System (IBS) and Conventional Method in Construction Industry in Terms of Quality
    ( 2023-10-04)
    Mardhiah Farhana Omar
    ;
    Muhd Afiq Hizami Abdullah
    ;
    Najihah Abdul Rashid
    ;
    Fatt H.L.
    ;
    Abdul Latif Abdul Rani
    ;
    Ishak H.
    Construction quality is defined as the achievement of a satisfactory level of performance in construction work. One of the variables considered in the management of construction projects is quality. The quality of the building can be determined by its performance and compliance with all applicable requirements. However, the construction sector is facing difficulties because the quality of several projects has fallen short of expectations. As a result, the problem of lack of attention to construction quality must be addressed. Therefore, the objective of this study is to identify the elements that affect construction quality in the construction sector when IBS are used compared to conventional techniques, as well as to evaluate the success of construction with IBS compared to conventional methods in terms of quality. The final objective is to evaluate the link between the elements affecting the building quality in the Industrial Building System (IBS) and the conventional technology, as well as the quality success of the building. In this study, the quantitative analysis was conducted through questionnaire surveys that included the G7 construction companies in Selangor interested in building quality. Stratified random sampling approach was used in this study. QLASSIC was conducted by 130 Class 7 contractors from Selangor registered with the CIDB. This means that 97 people from the population are needed to complete the questionnaires. The results suggest that the most important elements affecting construction quality are that the construction of IBS components is not affected by extreme weather conditions because the prefabricated components are manufactured in a controlled environment, unlike the traditional technique. In addition, unlike traditional methods, IBS requires the use of professional personnel to install the structural components. As a result, the quality of a building can increases and defects can be reduced if it is successful. The importance of this study is that it will help contractors improve their quality on certain jobs and reduce unsatisfactory results in the future.
      1  35