Mohd Zamri Abdullah

Consequence Study of Pressurized CO2 Release Containing Impurities with Obstacles

A rupture or puncture of a carbon dioxide (CO2) pipeline will result in a release of dense CO2 gas cloud mixed with toxic impurities such as hydrogen sulfide (H2S) to the ambience. This paper has proposed an approach for developing an accurate consequence model for CO2 release containing H2S in order to demonstrate a safe layout and other safeguards. Thus, a validated code using computational fluid dynamics (CFD) was applied to predict time-varying concentrations of CO2 and H2S at a point of downwind release area. Then overall fatality rate due to both CO2 and H2S has been estimated at this point. Results indicate that this is a suitable method for assessing the consequences of the release of CO2 via pipeline leakage.

Synthesis and Dehumidification Performance of Calcium Chloride Derived from the Waste Shells of Anadara granosa

The waste shell of Anadaragranosa or blood cockle is utilized as an alternative source for calcium carbonate (CaCO3) in the synthesis of calcium chloride (CaCl2) as a dehumidifier. In this paper, the synthesis of CaCl2 from the waste shell was investigated at various concentrations of HCl reactant and the shells’ particle sizes to determine the optimum yield. The synthesized CaCl2 was further tested on its capacity in adsorbing moisture and compared with the commercially-available dehumidifier. It was found that concentration of HCl at 5 M produced the highest yield, while the particle size of 0.5 mm took the shortest period in producing CaCl2 from the waste shells of Anadaragranosa. Investigating the performance as dehumidifier in a controlled environment, synthesized CaCl2 showed similar capacity in sorbing moisture as the commercially-available dehumidifier, proving the high potential of the waste shells of Anadaragranosa to serve as a green alternative for CaCO3 in producing CaCl2.

pH Dependence on Biosorption of Pb (II) by P. amaryllifolius Roxb

Solution pH plays an important criterion in the biosorption system in ensuring optimum uptake of heavy metal by a biomass is achieved at the highest performance. In this study, the biosorption of lead (II) ions by the non-living biomass of P. Amaryllifolius Roxb is performed at various pH from acidic to alkaline conditions. Results show that the optimum pH for the removal of lead (II) ions from wastewater occurs at pH 5, whereby the sorption activity occurs through monolayer process as it follows the Langmuir isotherm. High removal percentage of the metal ions at various concentrations further emphasize on the viability of P. amaryllifolius Roxbto be utilized as a green resources in the wastewater treatment.