Elden Willems , Niels Van Velthoven , Erik Smolders , Maarten Everaert
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引用次数: 0
Abstract
Nutrient recycling is imperative for moving towards a circular economy. Layered double hydroxides (LDH) have been suggested as materials of interest for phosphorus (P) recycling, as they can selectively recover P from liquid waste streams and can be used as efficient P fertilisers in agriculture. Local P recycling with LDH can be particularly valuable for smallholder farmers with limited access to fertilisers, e.g. in tropical regions. However, conventional LDH production relies on external sources of Al3+ for the synthesis of MgAl LDH. The present work proposed a new fertiliser technology based on LDH partly synthesized at room temperature with weathered soil as a local and omnipresent source of Al, supplemented with MgO and NaOH. The successful synthesis of LDH via this approach was confirmed by X-ray diffractometry (XRD). The capacity of this LDH to recover P was determined with synthetic P solutions and human urine as a waste model. A chemical desorption test demonstrated the available nature of P sorbed onto the soil-based LDH, which largely outperformed the availability of P sorbed onto the untreated soil. Finally, the fertiliser potential of the soil-based LDH loaded with recycled P was confirmed in a pot trial with rice (Oryza sativa L.) in weathered soil, indicating the combined P fertiliser and liming effect. Taken together, this study presented the proof-of-concept of a novel technology for local P recycling in tropical regions.
期刊介绍:
Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as:
• Synthesis and purification
• Structural, crystallographic and mineralogical properties of clays and clay minerals
• Thermal properties of clays and clay minerals
• Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties
• Interaction with water, with polar and apolar molecules
• Colloidal properties and rheology
• Adsorption, Intercalation, Ionic exchange
• Genesis and deposits of clay minerals
• Geology and geochemistry of clays
• Modification of clays and clay minerals properties by thermal and physical treatments
• Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays)
• Modification by biological microorganisms. etc...