Browsing by Author "Wijerathne, WDCC"

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    Development and characterization of a novel brick made from clay brick waste/rice husk ash/cement/coconut shell ash
    (IEEE, 2023-11-09) Wijerathne, WDCC; Kanagarajah, V; Abeysooriya, R; Adikariwattage, V; Hemachandra, K
    Agro and demolition waste have been researched to develop masonry units in the contemporary construction industry. This study aims to enhance the performance of an already-developed clay brick waste/rice husk ash/cement brick by adding coconut shell ash (CSA). Here, CSA was separately added to replace cement by 0,2,4,6 and 8%, by weight. As per results, 4% of CSA yield in minimum water absorption (20.6%) and maximum compressive strength (4.56 MPa). By adding CSA, the water absorption of the clay brick waste/rice husk ash/cement brick can be reduced, and such bricks result in improved compressive strength and water absorption. The scanning electron microscope micrographs confirm that pozzolanic reactions take place in bricks. The proposed bricks can be recommended to control the land pollution caused by rice husk ash, coconut shells and clay brick waste and they ideally suit for non-load-bearing applications in moderate weathering conditions.
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    A novel brick made from clay brick waste/rice husk ash/cement to adsorb heavy metals and organic dyes in wastewater
    (IEEE, 2022-07) Rajapaksha, RPTN; Wijerathne, WDCC; Rathnayake, M; Adhikariwatte, V; Hemachandra, K
    We propose a composite brick made of rice husk ash, brick waste and cement for convenient application of the adsorbent and removal (after the adsorption is completed). Four commonly found adsorbates in industrial wastewater effluents (i.e., Pb(II), As(V), Hg(II) and Malachite green dye (MG)) were selected and the adsorption studies were conducted at 25°CC. Results indicate that the brick is capable of removing 9S.S6%, 7S.36%, 22.20% and 99.9S% of Pb(II), As(V), Hg(II) and MG, respectively. These values are close to individual removal percentages by rice husk ash and clay brick and clay brick waste. The equilibrium loading follows the order Pb(II) > As(V) > MG ≈ Hg(II). Further, Pb(II), As(V) and MG follow the pseudo second order kinetics and the film diffusion becomes the rate-limiting step. The strength of the adsorption bond follows the order Pb(II) > As(V) >MG and the adsorption rate decreases according to MG > As(V) >Pb(II) order. Considering its adsorption efficiency and effectiveness, the proposed brick can be identified as an efficient, effective and convenient solution to treat industrial wastewater streams.