Sustainable utilization of rice husk ash from power plants: A review

Abstract To move towards sustainability, finding sustainable ways of using rice husk ash for a large rice producing country like Thailand is essential. This review seeks to find sustainability characteristics of the uses of rice husk ash from power plants. It also reviews how rice husk ash is produced from different power generation technologies. Characteristics of rice husk ash are affected by different factors such as sources, preparation methods and combustion technologies. Different forms of rice husk ash, amorphous and crystalline, suit different applications. Ash from moving grate technology is suggested for use as adsorbent while that from fluidized bed is suggested for use as filler in polymeric composites and in the synthesis of innovative ceramic compounds. The ash from suspension fired technology is suggested for use in the construction industry and zeolite production. In addition to technical viability, using rice husk ash to substitute conventional products helps gain both environmental and economic benefits. Despite claiming sustainable applications of rice husk ash, many research papers report only technical performances of the products. This paper draws out sustainability characteristics of different rice husk ash applications using the “triple bottom line” framework. Potential reduction of greenhouse gas emissions, cost saving and employment generation of rice husk ash use options have been investigated. Results from the review suggest that using the ash to replace charcoal is the most sustainable option when comparing with other alternatives such as Portland cement, commercial silica and lime. This option could help to reduce GHG up to 1005 kg CO 2eq /t product, to save cost up to 8000 THB/t product, as well as to help generate employment for about 5 person-years/M THB spent in the sector. However, to make the sustainability assessment more comprehensive, other sustainability indicators such as fossil fuel depletion, human toxicity, ecotoxicity, particulate matter formation, total net profit (TNP), total value added (TVA), and incomes of workers are also needed to be considered in future research.

[1]  Shabbir H. Gheewala,et al.  Emission Assessment of Rice Husk Combustion for Power Production , 2009 .

[2]  A. El-Dakroury,et al.  Rice husk ash (RHA) as cement admixture for immobilization of liquid radioactive waste at different temperatures , 2008 .

[3]  D. J. Cook,et al.  Rice husk ash-lime-cement mixes for use in masonry units , 1977 .

[4]  M. Kawakami,et al.  Development of a New Furnace for the Production of Rice Husk Ash , 2001, "SP-199: Seventh CANMET/ACI International Conference on Fly Ash, Silica Fume, Slag and Natural Pozzolans in Concrete".

[5]  S. Kurama,et al.  The reaction kinetics of rice husk based cordierite ceramics , 2008 .

[6]  A. J. Toft,et al.  A techno-economic comparison of power production by biomass fast pyrolysis with gasification and combustion , 2002 .

[7]  A.L.A. Fraaij,et al.  Reactive pozzolanas from rice husk ash: An alternative to cement for rural housing , 2006 .

[8]  R. Pode.  Potential applications of rice husk ash waste from rice husk biomass power plant , 2016 .

[9]  Somchart Soponronnarit,et al.  Techno-economical evaluation of a rice husk ash (RHA) based sand–cement block for reducing solar conduction heat gain to a building , 2009 .

[10]  Chao-Lung Hwang,et al.  Investigation into the use of unground rice husk ash to produce eco-friendly construction bricks , 2015 .

[11]  P. K. Mehta,et al.  Energy and industrial materials from crop residues , 1976 .

[12]  Donald E. Macphee,et al.  Immobilization of metal-containing waste in alkali-activated lime–RHA cementitious matrices , 2007 .

[13]  Simon Shackley,et al.  Sustainable gasification–biochar systems? A case-study of rice-husk gasification in Cambodia, Part II: Field trial results, carbon abatement, economic assessment and conclusions , 2012 .

[14]  C. Hwang,et al.  The use of rice husk ash in concrete , 1996 .

[15]  Figen Balo,et al.  Feasibility study of “green” insulation materials including tall oil: Environmental, economical and thermal properties , 2015 .

[16]  P. Abdul Salam,et al.  Assessment of sustainable energy potential of non-plantation biomass resources in Sri Lanka , 2005 .

[17]  A. Abu Bakar,et al.  An investigation of the potential of rice husk ash as a filler for epoxidized natural rubber—II. Fatigue behaviour , 1997 .

[18]  Luciana Paulo Gomes,et al.  Life cycle analysis (LCA) for the incorporation of rice husk ash in mortar coating , 2010 .

[19]  Zichen Wang,et al.  A sustainable route for the preparation of activated carbon and silica from rice husk ash. , 2011, Journal of hazardous materials.

[20]  S. Prasertsan,et al.  Biomass and biogas energy in Thailand: Potential, opportunity and barriers , 2006 .

[21]  Tim Grant,et al.  Comparative life cycle assessment of uses of rice husk for energy purposes , 2011 .

[23]  S. Gheewala,et al.  Biofuels and employment effects: implications for socio-economic development in Thailand. , 2012 .

[24]  R. Fao,et al.  Rice-husk, conversion to energy , 1978 .

[25]  Lars Iselid,et al.  Web of Science and Scopus: a journal title overlap study , 2008, Online Inf. Rev..

[26]  David Chiaramonti,et al.  Power generation using fast pyrolysis liquids from biomass , 2007 .

[27]  Richard C.M. Yam,et al.  A cleaner production of rice husk-blended polypropylene eco-composite by gas-assisted injection moulding , 2014 .

[28]  Piet Stroeven,et al.  Ash of vegetable waste used for economic production of low to high strength hydraulic binders , 1999 .

[29]  P. Rangaraju,et al.  Effect of grinding of low-carbon rice husk ash on the microstructure and performance properties of blended cement concrete , 2015 .

[30]  G. C. Isaia.  High-performance concrete for sustainable constructions , 2000 .

[31]  Paul Komor,et al.  Renewable Energy Policy , 2004 .

[32]  Muhammad Ekhlasur Rahman,et al.  Self compacting concrete from uncontrolled burning of rice husk and blended fine aggregate , 2014 .

[33]  S. Kumar,et al.  Utilization of Rice Husk and Their Ash: A Review , 2013 .

[34]  C. A. Moraes,et al.  Characterization of rice husk ash produced using different biomass combustion techniques for energy , 2016 .

[35]  Jumras Limtrakul,et al.  Synthesis of ZSM-5 zeolite from lignite fly ash and rice husk ash , 2004 .

[36]  V. D. Ramos,et al.  Design and analysis of single-factor experiments: Analysis of variance of the effect of rice husk ash and commercial fillers in NR compounds , 2007 .

[37]  M. Bahrololoom,et al.  Enhancing the mechanical properties of an epoxy coating with rice husk ash, a green product , 2011 .

[38]  O. Ortíz-Rodriguez,et al.  Laboratory processing of Colombian rice husk for obtaining amorphous silica as concrete supplementary cementing material , 2015 .

[39]  A. P. Gursel,et al.  A life-cycle approach to environmental, mechanical, and durability properties of “green” concrete mixes with rice husk ash , 2016 .

[40]  Natthakich Assanee,et al.  State of The Art of Biomass Gasification Power Plants in Thailand , 2011 .

[41]  Jahangir Mirza,et al.  Reduction in environmental problems using rice-husk ash in concrete , 2012 .

[42]  J Prasara-A,et al.  Comparative life cycle assessment of rice husk utilization in Thailand , 2009 .

[43]  Zichen Wang,et al.  A green route to preparation of silica powders with rice husk ash and waste gas , 2010 .

[44]  S. Fukuda.  Pyrolysis Investigation For Bio-Oil Production From Various Biomass Feedstocks In Thailand , 2015 .

[45]  Carlos Perez Bergmann,et al.  Thermal insulators made with rice husk ashes: Production and correlation between properties and microstructure , 2007 .

[46]  S. Datta,et al.  Simultaneous recovery of silica and treatment of rice mill wastewater using rice husk ash: An economic approach , 2015 .

[47]  S. Sohi,et al.  Sustainable gasification–biochar systems? A case-study of rice-husk gasification in Cambodia, Part I: Context, chemical properties, environmental and health and safety issues , 2012 .

[48]  Luiz Claudio Pardini,et al.  PREPARATION AND CHARACTERIZATION OF CERAMIC COMPOSITES DERIVED FROM RICE HUSK ASH AND POLYSILOXANE , 2009 .

[49]  E. Bontempi,et al.  A sustainable technology for Pb and Zn stabilization based on the use of only waste materials: A green chemistry approach to avoid chemicals and promote CO2 sequestration , 2014 .

[50]  S. Antiohos,et al.  Low embodied energy cement containing untreated RHA: A strength development and durability study , 2013 .