To maintain design capacity of sand filters, they need to be backwashed periodically with treated water.

Globally, up to 10% of all treated water is used for backwashing.

This water contains high amounts of suspended solids, bacteria, parasites, and heavy metals and is typically sent wholly or partly to the raw water intake of the plant. This risks upsetting the treatment process and affecting the final water quality.

Although filter backwash wastewater contains suspended solids in the hundreds of mg/L and turbidities exceeding 1,000 NTU, our Silicon Carbide membranes can directly treat and reuse the wastewater for potable reuse.

Key highlights for recovery of sand filter backwash water using Cembrane include:

• No pretreatment
• Treated water suitable for potable reuse
• >95% recovery rate
• Energy consumption of 20-40 watts pr. m3
• Compact design built into existing concrete structure or in skid or containerized unit

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