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Red mud for production of novel clay-compost from organic waste

Hofstede, H.T. and Ho, G.E.ORCID: 0000-0001-9190-8812 (1992) Red mud for production of novel clay-compost from organic waste. In: Proceedings of an International Bauxite Tailings Workshop, 2 - 6 November, Perth, Western Australia pp. 353-365.

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Abstract

Compost produced from municipal waste can be limited in its application because of contamination by heavy metals from, for example, dry cell batteries. The heavy metals are complexed to the organic fraction and are released during decomposition. Experiments on batch and pilot plant scale were carried out where red mud was added to organic waste before composting, in order to reduce the long term metal mobility by metal adsorption into the inorganic fraction (red mud). The metal mobility was observed to be reduced considerably for various heavy metals, reducing plant and soil solution availability as well as acid extractability. The compost process was not affected. Immobilisation of the heavy metals will enable increased use of municipal compost as a soil conditioner to fight soil erosion, improve parks and gardens and increase yields in agriculture and horticulture.

Item Type: Conference Paper
Murdoch Affiliation: School of Environmental Science
United Nations SDGs: Goal 13: Climate Action
URI: http://researchrepository.murdoch.edu.au/id/eprint/22733
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