Abstract
Amorphous calcium silicate hydrates (A-CSHs) can be chemically synthesized using abundantly available, inexpensive materials such as siliceous shale and calcium hydroxide. A-CSHs can serve as a bifunctional adsorption-aggregation agent for phosphate (Pi) recovery from aqueous solution. A-CSHs can also be prepared by soaking recyclable calcium silicates such as concrete sludge and steelmaking slag in a dilute hydrochloric acid solution. Since A-CSHs show high Pi removability, settleability, and filterability, they have the potential to offer a simple, cost-effective option to the recovery of Pi from Pi-rich waste streams. On-site experiments using a mobile, pilot-scale plant have showed that A-CSHs can recover approximately 80% Pi from a Pi-rich sidestream in a wastewater treatment plant. This chapter describes a simple process for Pi recovery from aqueous solution using A-CSHs as a bifunctional adsorption-aggregation agent.
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Okano, K., Ohtake, H., Kunisada, M., Takano, H., Toda, M. (2019). Phosphate Recovery Using Amorphous Calcium Silicate Hydrates. In: Ohtake, H., Tsuneda, S. (eds) Phosphorus Recovery and Recycling . Springer, Singapore. https://doi.org/10.1007/978-981-10-8031-9_30
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DOI: https://doi.org/10.1007/978-981-10-8031-9_30
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