Ferric (hydr)oxide is a suspension of aquafer that results from the process of iron removal from groundwater and coagulation of surface water. As a rule, we distinguish between liquid aquafer (dry-matter content of 8-12%) and dewatered aquafer (dry-matter content of 30-40%).
Ferric (hydr)oxide is red-brown in colour and, in its dewatered form, looks a lot like clay. It consists primarily of aquafer, with varying concentrations of materials such as calcium carbonate, organic matter and metals. This residual stream is generated at almost 100 water production locations in the Netherlands and Belgian Flanders.
Ferric (hydr)oxide is known for its property of releasing the (hydr)oxide when it binds to sulphur, arsenic or phosphorus. This is why it is frequently used in biogas reactors and WWTPs to prevent the formation of sulphur gases.
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