Mahyun Ab Wahab, Dr.This page provides access to scholarly publication by UniMAP Faculty members and researchershttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/411852024-03-28T10:55:57Z2024-03-28T10:55:57ZUse of alum and ferric sulphate for treating landfill leachate via coagulation Process: A comparative studyNoor Ainee, ZainolNur Adrina Nadia, MohamadAzlinda, GhaniMahyun, A.W.Nabilah Aminah, LutpiFarah Naemah, Mohd Saadhttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/639552020-02-11T03:05:58Z2019-01-01T00:00:00ZUse of alum and ferric sulphate for treating landfill leachate via coagulation Process: A comparative study
Noor Ainee, Zainol; Nur Adrina Nadia, Mohamad; Azlinda, Ghani; Mahyun, A.W.; Nabilah Aminah, Lutpi; Farah Naemah, Mohd Saad
Landfill leachate is a complex wastewater which may give potential problems to the
environment. Besides the new treatment processes that has been implemented, coagulation
and flocculation treatment are considered as the most widely used method in treating
landfill leachate to reach requirements specification for the discharge of leachate.
Regularly, aluminium sulphate (alum) is used as a chemical coagulant to enhance the
removal contaminants in this treatment process. Besides alum, ferric sulphate also shows
their ability in leachate treatment. Hence, this study has been carried out to examine the
comparison between both chemical coagulants in treating leachate form Padang Siding
Landfill Site. The optimum pH and coagulant dosage was evaluated by a series of Jar Test
experiment. In addition, the Sludge Volume Index (SVI) test also determined for the treated
leachate under optimized conditions. Ferric sulphate with optimum pH 3.0 and coagulant
dosage of 6000 mg/L was successfully removed of 58.9% of COD, 72.9% of turbidity and
46.1% of suspended solid. Meanwhile, alum coagulant was able to removed 69.4% of COD,
94.5% of turbidity and 84.3% of suspended solid under optimum pH 5.0 and 8000 mg/L of
optimum coagulant dosage. Besides that, SVI of alum was 46. 8 mL/g and ferric sulphate
gave the value of 32.5 mL/g for SVI. Hence, ferric sulphate is recommended to replace alum
as a coagulant in landfill leachate treatment process since the efficiency is almost the same
as alum.
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2019-01-01T00:00:00ZProperties of concrete containing rice husk ash under sodium chloride subjected to wetting and dryingRamadhansyah Putra, JayaSalwa, Mohd Zaini MakhtarMahyun, Ab WahabAbu BakarMegat Azmi, Megat JohariChe Norazman, Che Wanhttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/418772016-06-04T04:52:35Z2012-01-01T00:00:00ZProperties of concrete containing rice husk ash under sodium chloride subjected to wetting and drying
Ramadhansyah Putra, Jaya; Salwa, Mohd Zaini Makhtar; Mahyun, Ab Wahab; Abu Bakar; Megat Azmi, Megat Johari; Che Norazman, Che Wan
In this study, the influences of different replacement levels of RHA blended cement concrete subjected to 5% NaCl solution with drying-wetting cycles was evaluated. For parametric study, RHA was used as a Portland cement Type I replacement at the levels of 0%, 10%, 20, 30%, and 40% by weight of binder. The water-to-binder ratio was 0.49. The evolution of compressive strength, weight loss, and reduction in strength was monitored for up to 6 months. Generally, the compressive strength test has been shown that use of RHA in blended cement has a significant influence on chloride concentration. When increasing the replacement level of RHA, the strength of concrete also increases in comparison to OPC concrete (except RHA40) even subjected to sodium chloride. In addition, increasing the percentage replacement of RHA tends to reduce the compressive-strength loss due to increased pozzolanic reaction. It is concluded that the incorporation of RHA in cement significantly improved the resistance to chloride penetration of concrete.
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2012-01-01T00:00:00ZThermal analysis and pozzolanic index of rice husk ash at different grinding timeRamadhansyah Putra, JayaMahyun, Ab WahabSalwa, Mohd Zaini MakhtarAbu BakarMegat Azmi, Megat JohariMohd Haziman, Wan Ibrahimhttp://dspace.unimap.edu.my:80/xmlui/handle/123456789/414722016-05-06T08:14:38Z2012-01-01T00:00:00ZThermal analysis and pozzolanic index of rice husk ash at different grinding time
Ramadhansyah Putra, Jaya; Mahyun, Ab Wahab; Salwa, Mohd Zaini Makhtar; Abu Bakar; Megat Azmi, Megat Johari; Mohd Haziman, Wan Ibrahim
Thermo-gravimetric and differential thermo-gravimetric analyses were performance to study the effect of temperature on the mineralogical compositions of rice husk ash subjected to different grinding time. Eight rice husk ashes with different grinding time, i.e. coarse original rice husk ash (RHA0), RHA1, RHA2, RHA3, RHA4, RHA5, RHA6, and RHA7 were used for the study. The TGA/ DTA analysis and X-ray fluorescence (XRF) was used through this investigation. On the other hand, the pozzolanic activity index of the RHA was assessed in accordance with ASTM C 311-11a. From the experiment, it was found that the greater the weight loss, the less the crystallinity of the RHA. In addition, there are no significant differences in chemical compositions of the rice husk ashes with different grinding time. Furthermore, when the grinding time increased from 1 hour and 30 minutes to 5 hours, there was a significant drop in the pozzolanic index.
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2012-01-01T00:00:00Z