Water Sector

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New initiative Alu Circles: converting sludge waste in water plants into a valuable resource

Cost reduction and sustainability are already proven in practice for residuals from drinking water production including lime pellets and ferric sludges. Aluminium based sludges are the next target, the disposal of which comes at substantial and ever-increasing cost. Alu Circles, an international initiative based on PCP (Pre-Commercial Procurement) principles, will make this happen. Allied Waters and Corvers Procurement Services are coordinating Alu Circles.

Aluminium based flocculants are generally used in drinking water plants treating surface water. The remaining sludge is typically sent to a disposal site as it  has few beneficial uses. The sum of internal and out-of-pocket costs of disposal often exceeds 100 €/ton sludge (as is). For a water plant producing 100 million m3/year this represents a cost of around 100.000 €/year. The challenge is to convert this one-off use of material into a sustainable solution, such as  upcycling or recycling, at lower cost. This is the principal goal of Alu Circles.

New initiative Alu Circles: converting sludge waste in water plants into a valuable resource

Cost reduction and sustainability are already proven in practice for residuals from drinking water production including lime pellets and ferric sludges. Aluminium based sludges are the next target, the disposal of which comes at substantial and ever-increasing cost. Alu Circles, an international ini...

  • Allied Waters
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