Developing country causes growth of industries sectors. Despite that industrial sectors releases massive amount of waste water into the environment. At the same time, the increasing number of vehicles in Malaysia promotes the development of automobile workshop that produces huge amount of wastewater as well. Wastewater contains high level of suspended total solids and leave untreated. For instance oil, grease, dyestuff, chromium, phosphate in washing products and colouring, as well as heavy metals such as lead, cadmium, barium and others potential metals. All these hazardous wastes directly pollute the environment especially the groundwater and harm the ecosystem. In order to minimize and reduce the impact to the environment, the wastewater needed to be treated using technology such as permeable reactive barrier (PRB). Activated carbon is one of the PRB utilised. It is a compromised material for treatment of wastewater where there are varieties of sources to produce activated carbon. Malaysia as an active agricultural country, massive amount of agriculture wastes can be turned into activated carbon. They are two methods used to produce activated carbon, namely furnace heat processing and microwave processing. The usage of furnace and microwave instruments can produce different quality of activated carbon due to different mechanism involves. Furnace heat processing transferred the heat from external to the internal but microwave processing is vice versa. In this article, a brief overview of activated carbon usage for wastewater treatment is highlighted.
Clay as pottery’s raw material is a major factor that is affecting the quality and reliability of any pottery product. The clay source areas need to be well determined their geochemical properties in order to control the end properties of clay product. Pergau river is located in the northwest of Kelantan, a state in Malaysia. In this study, elemental and phase analysis of Pergau river clay was carried out. The baked clay products were characterized their density and toughness. X-ray fluorescence showed the clay is rich with Fe and X-ray diffraction showed low concentration of feldspar compared to other known clay source areas, which are Sayong and Mambong. Fewer feldspar content decrease toughness of the pottery product. However, some location showed the comparable result with the Sayong and Mambong. The clay is high in density, low in shrinkage percentage and excellent in mechanical strength compare to other clays collected from Pergau River.
Pottery in Malaysia is been known for its utilized functions and unique properties. Clays as the pottery’s raw materials are a major factor that affecting the quality and reliability of some pottery products. Observations on clays’ elements and phases are very helpful for productions of the good pottery. Hence, in this review, chemical compositions of clays in terms of elements and phases structures are discussed. Basically, the most elements found in clays are Si, Al, Fe, Ti, K and Ca. Depends on location, the concentrations for those clays elements in Malaysia are at range of 24.8 – 32.4 for Si, 10.8 – 19.0 for Al, 0.09 – 2.12 for Fe, 0.08 – 1.13 for Ti and 0.45 – 3.39 for K. Several studies reported, they exist in form of oxide compound which are SiO2, Al2O3, Fe2O3, TiO2, MgO, CaO, Na2O, K2O and P2O5. The percentages of elements in clays do not only determine the clays characteristics, but also influence the physical, mechanical and chemical properties of the end product. Increase of major element like silica arises the melting point, lowers the fluidity, and enhances the hardness and tensile strength. Meanwhile, increase alumina content enables the green body to withstand the sintering temperature and also increase the hardness of the pottery.
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