Sludge is a by-product of water treatment. Sludge is produced during the clarification and filtration process in the water treatment system. It is also produced from the accumulated solids removed from sedimentation basin or settling tank.
The objective of this project is to reduce the environmental impact generated by the sludge coming from the Water Treatment Plant (WTP), through a new sludge management concept that introduces a method that re-uses sludge as raw material for the structural pottery industry.
Pottery is the type of ceramic material, which the American Society for Testing and Materials (ASTM) has defined as wall fired ceramic wares that contain clay when formed except technical, structural and refractory product.
The term pottery is also used for a technique involving ceramic, where clay is mixed with other minerals and is formed into objects, including vessels generally designed for utilitarian purposes.
ii) corrosion resistance,
iii) electrically insulating, semi-conducting, or super conducting,
iv) non-magnetic and magnetic, and
v) hard and strong, but brittle.
The Eco-pottery is made from water treatment sludge. During the process, the organic substances in the sludge were eliminated through burning, while the heavy metals were safely contained in the product.
Furthermore, energy is saved during the production process since sludge is used as combustion during the burning process. Technically the Eco-pottery has demonstrated that the WTP sludge could be viably used in the mixture to produce pottery. The chemical composition, the energy properties of the sludge and the mineral contained in the sludge were analysed in a laboratory.
Chemical composition is vital because of its effect on the product behaviour. X-ray Fluorescence (XRF) and Total Nitrogen Measurement (TNM) determined the chemical composition of water treatment sludge.
The physical characteristics of the sludge were also tested. The test conducted is moisture content and plasticity of the sludge. The mineral compositions were determined by X-ray Diffraction (XRD) was silica, kaolinite, muscovite, iron oxide and iron hydrogen phosphate.
Water treatment sludge contained high concentration of free silica. The Eco-pottery was made using throwing technique. The samples are then pressed into mould to make prismatic bar each mark with 100mm measurement. Linear shrinkage was determined by measuring the length of the samples before and after the firing stage using a calliper with a precision of Â±0.01 mm. Water absorption was done according to the Malaysian Standard, MS ISO 10545-3:2001. Firing properties were obtained by observing whether potteries resistant to low and high temperature.
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