Potential applications of rice husk ash waste from rice husk biomass power plant

Published Date
January 2016, Vol.53:1468–1485, doi:10.1016/j.rser.2015.09.051

Title 
Potential applications of rice husk ash waste from rice husk biomass power plant

• Author 

• Ramchandra Pode ^,

• Kyung Hee University, Department of Physics, Dongdaemoon-gu, Seoul 130-701, Republic of Korea

Received 17 August 2014. Revised 29 June 2015. Accepted 18 September 2015. Available online 10 November 2015.

Abstract

Rice husk (RH), an agricultural waste, is abundantly available in rice producing countries like China, India, Bangladesh, Brazil, US, Cambodia, Vietnam, Myanmar, and South East Asia. Despite the massive amount of annual production worldwide, so far RHs have been recycled only for low-value applications. In recent years, many rice mills in rice producing countries have started using RH for the energy production for mill operations as well as household lighting in rural regions. Burning of RHs produces the rice husk ash (RHA). The disposal in landfills or open fields can be problematic and may cause a serious environmental and human health related problems due to the low bulk density of RHA.

Several ways are being thought of for disposing RHA by making its commercial use. The amorphous silica forms the main component (83–90%) of RHA. The amorphous silica rich RHA has wide range of applications. High-value applications and current research investigations such as the use of RHA in manufacturing of silica gels, silicon chip, synthesis of activated carbon and silica, production of light weight construction materials and insulation, catalysts, zeolites, ingredients for lithium ion batteries, graphene, energy storage/capacitor, carbon capture, and in drug delivery vehicles are presented. Use of RHA in potential future applications is also discussed. It is suggested that the amorphous silica rich RHA could become a potential resource of low cost precursor for the production of value-added silica based materials for practical applications.

Keywords

Bioenergy Rice

 husk (RH)

Rice husk ash (RHA)

Disposal of RHA

Amorphous silica

Applications of RHA

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