Siti Nazrah Zailani
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Preferred name
Siti Nazrah Zailani
Official Name
Siti Nazrah, Zailani
Alternative Name
Zailani, S. N.
Zailani, N. S.
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Scopus Author ID
37068168000
Researcher ID
FZZ-7095-2022

Research Output

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  • Publication
    Alum Sludge from Water Treatment Plant Potentials to Remove Aqueous Lead and Phosphorus
    ( 2023-06-09)
    Siti Nazrah Zailani
    ;
    Kamal N.K.
    ;
    Azani N.N.M.
    The use of alum as a coagulant throughout the process of drinking water treatment produces alum sludge as a by-product. The quantity of the sludge is enormous, so it is essential to manage and dispose appropriately. Conventionally, the authority of water treatment plant deposited the sludge in waste disposal area (landfill). To reduce the solid waste, many studies and research was done to utilize the use of this alum sludge. The reuse of this aluminium sludge as a solid adsorbent is one of the proposed applications, but alteration and characterization are required for this study. A batch process was developed to evaluate the potential of alum sludge for lead and phosphorus removal. The alum sludge undergoes chemical pre-treatment to enhance the adsorption capacity of the adsorbent (alum sludge). The dosages of alum sludge, concentration of heavy metal and pH were affecting the removal capacity was studied. The percentage of removal were nearly 100 % of both heavy metals Results demonstrated that alum sludge from water treatment plant is potential as adsorbent for removal of heavy metal.
  • Publication
    Effect of different microbial inoculums on the physico-chemical properties of spent mushroom medium composting
    ( 2023-07-01)
    Siti Nazrah Zailani
    ;
    Hamid N.S.A.
    The production of spent mushroom medium (SMM) from oyster mushroom industry is increasing every year parallel to the increment of the market demand. SMM is considered solid waste and conventionally collects and dumps into the landfill without any pre-treatment. SMM contains major beneficial organic elements with the potential to be converted into valuable compost with appropriate conditions. This research aims to study the potential of several types of microbial inoculum to compost the SMM with dried sludge from bio-ethanol waste and chicken manure in the aerobic composting process for 12 days. Three composting beds of 3 kg each were composted with different types of microbial inoculum; EM-1, tempeh fermented liquid, and food waste fermented liquid. The initial carbon-to-nitrogen (C/N) ratio and moisture for each composting bed were 23.42 and 55% respectively. The temperature, moisture content, pH, and total organic matter (TOM) were measured for each composting bed. All the composting beds reached the maximum temperature at the thermophilic phase (>40 °C) after 24 h of the composting being started. Similar trends were recorded for pH, moisture, and total organic matter (TOM) for all the composting beds. The commercial microbial inoculum (EM-1) recorded the highest degradation rate of TOM (0.0225 day−1) which followed the first-order kinetic reaction (R2 = 0.9556) compared to the tempeh and food waste fermented liquid. However, the results shown by tempeh and food waste fermented liquid were comparable to EM-1 microbial inoculum and thus feasible to substitute EM-1 for the composting of SMM.
  • Publication
    Spent Mushroom Medium Compost as a Soil Conditioner for the Initial Stage of Paddy Growth
    ( 2023-01-01)
    Siti Nazrah Zailani
    ;
    Ong J.J.
    ;
    Zarina Zakaria
    ;
    Zabidi K.A.A.
    Spent mushroom medium (SMM) is one of the agricultural wastes that produce daily from the cultivation of mushroom and is usually disposed by burning or landfilling, which is a waste of biological resources. The composted SMM has the potential physico-chemical properties that can be utilized as organic soil conditioner to improve soil fertility in paddy field. Conventionally, paddy field is usually fertilized by granular urea (GU) as nitrogen (N) fertilizer. The excessive use of GU had caused several environmental problems such as soil acidification and ammonia (NH3) volatilization. To evaluate the feasibility of organic SMM compost used as soil conditioner in paddy field, analysis was carried out to measure the physico-chemical properties. Pot experiment has been conducted, and the paddy growth was evaluated after 21 days of plantation. The soil sample was applied with GU and SMM compost with the same N fertilizer rate. Soil properties were measured before and after treated with soil conditioner. The paddy growth was evaluated with plant height and root:shoot (R/S) ratio. From the result obtained, SMM compost improved both physical and chemical properties of paddy soil, significantly increased WHC and soil porosity that help reduce nitrate (NO3−) leaching and reduce NH3 volatilization. As a whole, the application of SMM compost was successfully improved the soil fertility and had the potential to replace GU as the soil conditioner, but further improvement in the management practices should be performed to achieve better plant growth.