Khairunissa Syairah Ahmad Sohaimi
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Preferred name
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
    Compost Physical Properties Study on Degradation of Poultry Manure Composting in Closed-Aerated Composter
    ( 2020-12-18)
    Siti Nazrah Zailani
    ;
    Lee C.T.
    ;
    Noor Ainee Zainol
    ;
    Yusoff N.A.
    ;
    Khairunissa Syairah Ahmad Sohaimi
    A variety of parameters including physical, chemical, and biological properties of different input materials contribute to different composting performance. This study aimed to investigate the compost physical properties (bulk density, porosity, specific surface area and water holding capacity) on the composting process at different initial moisture content (MC). The degradation of total organic carbon (TOC) for the compost inoculated with Bacillus coagulans (BC) and effective microorganism (EM) was determined. The composting materials consisted of 50 % sawdust, 12 % chicken dung and 38 % rice husk with a fixed initial C/N ratio of 30. A closed-aerated composter was fabricated with an optimum air flow rate of 0.3 L/min.kg compost to avoid O2 limitation for 7 d of composting. The compost temperature was recorded to exhibit the active reaction between microorganisms and compost materials will generate a considerable amount of heat. The effect of the initial MC of the compost bed has been intensively investigated with regards to compaction analysis and compost particle for the composting inoculated with BC or EM in an aerated closed-system composter. The results showed that composting using the single strain of BC provides comparable results to that degraded by the commercial mixed culture EM.
      10  47
  • 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.
      25  2