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Home  >  Volume 46 (May, 2018)

27. EXPLOITING RICE HUSK POTENTIALS THROUGH REUSE, RECYCLING AND RECOVERY (3-R) APPROACH by Ekoh G.O., Ilaboya I.R. and Okpoko J.S. Volume 46 (May, 2018 Issue), pp207 –216
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EXPLOITING RICE HUSK POTENTIALS THROUGH REUSE, RECYCLING AND RECOVERY (3-R) APPROACH

Ekoh G.O., Ilaboya I.R. and Okpoko J.S.

Estate and Works Division, Akanu Ibiam Federal Polytechnic, Unwana Afikpo, Ebonyi State, Nigeria

Department of Civil Engineering, Faculty of Engineering, University of Benin, P.M.B 1154, Benin City, Edo State, Nigeria

Abstract

The target of this study was to exploit the full potential of rice husk, viz; as partial replacement of cement in the production of reinforced concrete (Reuse), as adsorbent in the treatment of effluent wastewater (Reuse), as mixture with sodium hydroxide and poultry droppings in the generation of biogas (Recovery), and in the production of silica for use in the cosmetics industry (Recycling) instead of being disposed as it is currently practiced in most developing countries of the world. 

The rice husk was collected, its potential as mixed ingredient with cement in the production of reinforced concrete coupled with its suitability as adsorbent in the treatment of domestic/industrial waste water, generation of biogas in conjunction with other materials and in the production of silica was studied with the aim of ensuring full utilization of the material and promoting environmental sustainability. 

Result obtained shows that rice husk can partially replace cement in concrete production up to about 15%, and can thus be recommended for use in low load bearing structures. In addition, about 47% removal efficiency for lead was obtained when 6.0g of activated rice husk was used in the treatment of effluent wastewater. Rice husk on its own cannot generate biogas, but about 57.5ml and 15ml biogas was produced from a mixed ratio of 1:1 and 3.5:1 of rice husk to poultry dropping in addition to a constant volume of 10% sodium hydroxide solution. Lastly, rice husk exhibited good potential in the production of silica as about 37.6g silica was precipitated from 250g rice husk ash.

Keyword: Reuse, Recovery, Recycling, Partial Replacement, and Environmental Sustainability.

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