Browsing by Author "Ahmad Jusoh"

Now showing 1 - 4 of 4
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    Fruit waste as feedstock for recovery by pyrolysis technique
    (International Biodeterioration and Biodegradation, 2016) Su Shiung Lam; Rock Keey Liew; Xin Yi Lim; Farid Nasir Ani; Ahmad Jusoh
    Fruit wastes of mango endocarp and waste fruits peel from banana, orange and watermelon were pyrolysed respectively and subjected to different analyses to examine their thermal behaviour, chemical functional group, elemental and proximate content. The fruit wastes were dominated by volatile matter (52e67 wt%) containing aliphatic hydrocarbons, fatty acids and lignocellulosic components that can be recovered as potential fuel or chemical feedstock via pyrolysis. The wastes were also detected to have considerable amounts of fixed carbon (30e36 wt%), thus showing potential to be pyrolysed to produce biochar for use as activated carbon or catalyst support. The wastes can be pyrolysed at 400 C to convert the majority of the waste content into volatiles for recovery as useful bio-oil and bio-gas, and the remaining solid mass can be recovered as bio-char. The results demonstrate that the fruit wastes show exceptional promise as a feedstock for pyrolysis conversion into potentially useful products.
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    Optimization of biomass harvesting of microalgae, Chlorella sp. utilizing auto-flocculating microalgae, Ankistrodesmus sp. as bio-flocculant
    (International Biodeterioration and Biodegradation, 2016) Fathurrahman Lananan; Fareza Hanis Mohd Yunos; Nurfarahana Mohd Nasir; Nur Syuhada Abu Bakar; Su Shiung Lam; Ahmad Jusoh
    Current microalgae harvesting technology depends on sophisticated and complex approaches such as hollow fiber filtration, chemical flocculants and centrifugation, which are deemed feasible if high value products were obtained. In this study the potential of auto-flocculating microalgae Ankistrodesmus sp. was examined for its potential as bio-flocculant to harvest Chlorella sp. Zeta Potential Analysis was performed on the microalgae in the pH range of 4.16e9.55 before subjecting the microalgae to the coagulation e flocculation assay. The isoelectric point of microalgae suspension was observed in the range of pH 5e8 and the magnitude of zeta potentials ranged between 10 mv to 35 mV. Ankistrodesmus sp. was inoculated at a dosage of 50% (v/v) into a batch of Chlorella sp. culture during the coagulation e flocculation assay. The removal efficiency shown by Ankistrodesmus sp. was 82% at pH 7.1 followed by 55% at pH 6.2. Utilizing Ankistrodesmus sp. for flocculation was efficient since it did not require any changes of pH because isoelectric point was observed within the normal pH of Chlorella sp. growth condition. Development of innovative microalgae treatment technology incorporating continuous bio-harvesting with microalgae-microalgae flocculation could provide a low-cost and sustainable wastewater treatment approach. In addition, the use of microalgae itself to harvest microalgae biomass harvesting could simplify downstream processing, saving resources and would reduce the production cost for future microalgae-based technology.
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    Prestasi butiran arang tempurung kelapa sawit sebagai media penuras dalam rawatan air
    (Universiti Malaysia Terengganu, 2009) Ahmad Jusoh
    Penurasan adalah satu proses yang lazim digunakan untuk menyingkirkanzarah-zarah terampai dalam rawatan air. Butiran mediaseperti pasir sangat berkesan untuk menyingkirkan zarah-zarah terampai yang terdapat dalam air. Dewasa ini, pembangunan yang pesat telah menyebabkan sumber air menjadi sangat keruh dan ditambah pula dengan permintaan air yang tinggi, penuras mono-media pasir didapati tidak mampu memenuhi keperluan kapasiti penurasan yang tinggi. Maka, strategi reka bentuk sangat mustahak dalam pemilihan penuras dual-media seperti penuras butiran arang tempurung kelapa sawit, BOPS dan pasir.
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    A study of coagulating protein of Moringa oleifera in microalgae bioflocculation
    (International Biodeterioration and Biodegradation, 2016) Siti Hajar Abdul Hamid; Fathurrahman Lananan; Helena Khatoon; Ahmad Jusoh; Azizah Endut
    Moringa oleifera is characterized by high coagulation properties, low cost and low toxicity hence is very promising to be utilized as an alternative coagulant to recover microalgae biomass from its suspension system. Hence, this study was performed with the objective to investigate the potentiality of M. oleifera as coagulant agent in harvesting microalgae and to investigate the effect of zeta potential in its coagulation-flocculation activity. Bradford protein assay was applied for rapid and accurate determination of protein concentration in the M. oleifera seed powder and protein powder. The flocculation activities were determined at isoelectric pH by computing the flocculation efficiency in terms of microalgae biomass recovery and removal percentage at various coagulant dosages. It was observed that the protein concentration was 211.71 mg g 1 mL 1 in M. oleifera seed powder and 188.16 mg g 1 mL 1 in protein powder which yielded 97% and 78% of biomass recovery, respectively at the dosage of 10 mg L 1. Result showed that M. oleifera seed derivatives supersede chemical coagulant, alum which yielded 34% of biomass recovery at the same dosage. M. oleifera seed powder and protein powder was proven to be highly promising bio-coagulant and suitable alternative to the chemical coagulant in environmentallysustainable harvesting of microalgae biomass.