Zulkifli Abdul Rashid

Hazardous waste management: current status and future strategies in Malaysia

Although Malaysia is a model for economic success amongst Southeast Asian countries with its impressive development over the last 36 years, it has not been without its detrimental effects on the natural environment. The most apparent effect is the drastic increase in the generation of hazardous wastes. This paper highlights Malaysias current status in hazardous waste management and the potential major difficulties. The principles, objectives and the remedial plans for hazardous waste control are also explained in detail and have been stipulated in the environmental policies as issued by the Department of Natural Resources and Environmental Ministry, Malaysia.

Thermal behaviour study of senakin coal and Refuse Derived Fuel (RDF) blends during pyrolysis using thermogravimetric analysis

Preliminary Thermogravimetric (TG) studies of pyrolysed Refuse Derived Fuel (RDF) – Coal blends (20 to 80%) at various heating rates, 20, 40, 60oC·min–1 have been performed to develop an efficient locally sourced renewable solid fuel. The characteristics of the coal/RDF blends followed those of the parent fuels in additive manner. Among the tested blends, 50:50 blends showed the optimum blend ratio but no synergistic effect was observed between the coal and RDF during co-pyrolysis. However, the kinetic analysis using modified Arrhenius equation indicates the existence synergistic effect between the RDF and coal, which induces lower coal pyrolysis activation energy.

Effect of Washing Pre-treatment of Empty Fruit Bunch Hydrogel Biochar Composite Properties as Potential Adsorbent

Hydrogel biochar composite (HBC) showed a great potential as effective organic contaminant removal in various wastewater and gas treatment. The effectiveness is depending upon quality of biochar used during the preparation of the HBC. In this work, pre-treatment of the biochar samples (EFB in this case) through washing was investigated. The raw EFB biochar was prepared using microwave assisted pyrolysis under 1,000 W for 30 min under N2 flow with 150 mL/min. The prepared biochar is chemically treated using either acid solution (HCl) or oxidising agent (H2O2) to enlarge the pores and remove impurities. The biochar is then polymerised by using acrylamide (AAm) as monomer, N,N’-methylenebisacrylamide (MBA) as crosslinker and ammonium persulfate (APS) as initiator to form the treated hydrogel biochar composite (EFB-HBC). The H2O2 treated biochar [EFB-HBC (P100)] shows better porosity compared to HCl treated biochar [EFB-HBC (H100)] where EFB-HBC (P100) has higher surface area (1.5997 m2/g) compared to EFB-HBC (H100) (1.2562 m2/g). The HBC is porous and carbonaceous material with 21 % and 31 % of carbon content in EFB-HBC (P100) and EFB-HBC (H100) which have potential as an adsorbent in wastewater and gas treatment.

Analysis the Effect of Explosion Efficiency in the TNT Equivalent Blast Explosion Model

In this study, the analysis will focus firstly on the analysis of the effect of an increment of explosion yield, η value between 2 and 9 % and its correlation toward the parameter peak side-on overpressure po, the duration of the positive phase td compared to diagnostic features of explosion damage results translated according to criteria developed by V.J. Clancey. Secondly, the aim is to validate the recommended methods of yield factor by Less [1] with estimated results (η between 2 and 9 %) by using TNT model in comparison with the physical observation damage of VCE incident impact at Flixborough in 1974.