Simple technology for recycling phosphate from wastewater to farmland in rural areas

A simple technology for phosphate (Pi) recovery has been developed using a bifunctional adsorption–aggregation agent. The bifunctional agent was prepared by soaking calcium silicates in hydrochloric acid solution. Importantly, recyclable calcium silicates were available almost free of charge from th...

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Bibliographic Details
Published in:Ambio 2018-01, Vol.47 (Suppl 1), p.S83-S92
Main Authors: Ohtake, Hisao, Okano, Kenji, Kunisada, Masashi, Takano, Hiroyuki, Toda, Masaya
Format: Article
Language:English
Subjects:
Agricultural land
Anaerobic treatment
Atmospheric Sciences
Calcium
Calcium silicates
Earth and Environmental Science
Ecology
Environment
Environmental Engineering/Biotechnology
Environmental Management
Farms
Hydrochloric acid
Iron and steel industry
Phosphates
Physical Geography
Recycling
Rural areas
Silicates
Sludge
Sludge digestion
Steel industry
Technology
Waste materials
Wastewater treatment
Wastewater treatment plants
Water resources
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Summary:A simple technology for phosphate (Pi) recovery has been developed using a bifunctional adsorption–aggregation agent. The bifunctional agent was prepared by soaking calcium silicates in hydrochloric acid solution. Importantly, recyclable calcium silicates were available almost free of charge from the cement industry and also from the steel industry. The acid treatment was essential not only for enhancing the ability of calcium silicates to remove Pi from aqueous solution but also for enabling the high settleability of removed Pi. On-site experiments using a mobile plant showed that approximately 80% Pi could be recovered from anaerobic sludge digestion liquor at a wastewater treatment plant. This technology has the potential to offer a simple, compact service for recycling Pi from wastewater to farmland in rural areas.
ISSN:0044-7447
1654-7209
DOI:10.1007/s13280-017-0976-9