Khairunissa Syairah Ahmad Sohaimi
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Khairunissa Syairah Ahmad Sohaimi
Official Name
Ahmad Sohaimi, Khairunissa Syairah
Alternative Name
Ahmad Sohaimi, Khairunissa Syairah
Ahmad Sohaimi, K. S
Main Affiliation
Scopus Author ID
57200989580
Researcher ID
GBL-8741-2022

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  • Publication
    Cactus opuntia as coagulant in treating landfill leachate via coagulation process
    ( 2021-02-23)
    Zainol N.A.
    ;
    Syarmimi F.N.
    ;
    Siti Nazrah Zailani
    ;
    Yusoff N.A.
    ;
    Ghani A.A.
    ;
    Khairunissa Syairah Ahmad Sohaimi
    Coagulation-flocculation treatment is often used for the treatment of stabilized landfill leachate. However, uses a non-environmentally friendly chemical coagulant which is a threat to environment quality, therefore Cactus opuntia is proposed to replace the use of current chemical coagulants such as aluminium sulphate in order to achieve sustainable growth. In this regard, the comparative suitability of Cactus opuntia and alum as coagulants for the treatment of the stabilised leachate of the Padang Siding Landfill Site was evaluated via a series of Jar Test experimental works with a rapid mixing speed of 100 rpm for 3 minutes, a slow mixing speed of 30 rpm for 10 minutes and a set-up period of 30 minutes. In addition, the sludge volume index (SVI) of the treated leachate sample was calculated under optimised conditions. Cactus opuntia was able to remove 66.8 per cent turbidity and 42 per cent COD at optimal pH 2 with a favourable dose of 8000 mg / L, while the optimal pH 5 with a coagulant dose of 8000 mg / L induced 94.5 per cent turbidity and 69 per cent COD reduction from the same leachate sample. In addition, the SVI of alum coagulant was 42.2 while the Cactus opuntia was 4.45 with a relative ratio of alum to opuntia of 9:1. Cactus opuntia may also be proposed as a plentiful coagulant of metal cationic ions such as aluminium, iron and silica elements for the treatment of leachate.
  • Publication
    Ammonium adsorption - Desorption using rice husk biochar
    ( 2021-05-24)
    Khairunissa Syairah Ahmad Sohaimi
    ;
    Nur Izzati Iberahim
    ;
    Ghani A.A.
    ;
    Zafifah Zamrud
    ;
    Heng C.W.
    Rice husk was utilized into biochar by pyrolysis and used as adsorbent for ammonium removal. Rice husk biochar (RHB) was produced at temperature of 3500C, 4000C, 4500C, 5000C, and 5500C. Characteristics of biochar were analyzed by moisture content, ash content, pH Zero Charge and Fourier Transform Infrared (FTIR) Spectroscopy. As the temperature for the pyrolysis increases, the moisture content of RHB decreases while the ash content of RHB increases. From the pH zero charge analysis, the value obtained from analysis is pH 7. The FTIR spectra showed the organic part of RHB with different functional groups such as alkene, alcohol, phenol, ether, ester etc. Based on the result of the characterization test, RHB500 was chosen as the best biochar for the adsorption of ammonium. The equilibrium contact time was 180 minutes and the optimum adsorbent dosage was 0.1g and the optimum concentration of ammonium was 1.2 ppm. For the adsorption-desorption of ammonium, RHB can run up to 5 cycles for biochar regeneration. Adsorption kinetic, pseudo-second-order model is more preferable than pseudo-first-order model because R2 value is 0.9995 which closer to 1.