Preliminary study of calcium silicate hydrate (tobermorite) as crystal material to recovery phosphate from wastewater

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Phosphorus is an essential nutrient for the growth of organism and plays a key role in the health and functioning of both terrestrial and aquatic ecosystems. However, excessive amounts of phosphorus may lead to adverse effects on both the ecology and receiving waters. High phosphorus concentration is often associated with algal blooms which results in eutrophication. Therefore, phosphorus removal from water is essential to control the eutrophication. On the other hand, the demand of phosphorus resources for the production of fertilizer is growing. With the depletion of high-quality commercial phosphate rocks and the adoption of stringent phosphorus discharge limit of wastewater, phosphorus recovery from wastewater has become of great concern. A crystallisation process for recovering phosphates was developed using an artificial seed crystal material consisting of calcium silicate hydrate. Laboratory experiments were conducted to apply the seed material in the phosphorus recovery from both model water and sewage from a wastewater treatment plant.

Original languageEnglish
Pages (from-to)49-54
Number of pages6
JournalDesalination and Water Treatment
Issue number3-Jan
Publication statusPublished - 1 Nov 2010


  • calcium silicate hydrate
  • phosphate recovery
  • tobermorite
  • sustainability
  • crystallisation


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