CADoS – Cellulose Assisted Dewatering of Sludge

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Cellulose uit toiletpapier oogsten om zuiveringsslib lokaal te ontwateren

RWZI Ulrum (Waterschap Noorderzijlvest)

RWZI Ulrum (Waterschap Noorderzijlvest)

The concept of CADoS is based on the efficient separation of cellulose fibers from raw wastewater and their reuse for dewatering excess sludge. This form of resource recycling proves to be advantageous due to a simpler sludge handling on site, minimal chemical consumption, lower energy consumption and lesser sludge transport.

In a consortium comprising two water authorities (Noorderzijlvest and Wetterskip Fryslan), Attero, CEW, RUG and Brightwork, the concept has been tested at WwTW Ulrum by implementing a pilot plant, capable of handling full flows. The pilot is based on fine screening technology for the “harvesting” of the cellulose fibers.

During the study, all relevant design variables have been investigated. The research showcased that high percentages of dry matter can be achieved with appropriate ratios of sieve material to surplus sludge. The research also led to a new and reliable measurement method for analyzing cellulose in a wastewater matrix.

In 2014, the CADoS consortium received the “Waterinnovatieprijs van de Unie van Waterschappen’’ (Water Innovation Award of the Union of Water authorities).