EcoPhos to Recover Phosphorus from Sewage Fly Ash

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Belgian-based EcoPhos contracted the delivery of fly ash from two Dutch incinerators of sewage sludge

Half of all Dutch sludge from municipal waste water treatment plants - 1,5 million ton/year - is burned in two fluidised bed incinerators by Slibverwerking Noord-Brabant in Moerdijk and HVC Groep in Dordrecht.

The recovery of phosphorus from fly ash of two incinerator plants is expected to become operational in 2017.

The contract was signed on 26 February by financial manager Silvester Bombeeck of Slibverwerking Noord-Brabant (SNB), chief executive office Mohamed Takhim of EcoPhos, and director raw materials Dion van Steensel of HVC Groep.

High concentration phosphorus

Sewage water in the Netherlands contains approximately 12 million kg of phosphorus of which 85% ends up in sewage sludge.

When sewage sludge is subsequently burned in a separate mono-sludge combustor, such as at HVC and SNB, most of the phosphorus ends up in the fly ash.

Fly ash contains up to 27% phosphorus.

Wet chemical process

EcoPhos, in cooperation with SNB and HVC, developed a wet-chemical process to recover phosphorus from fly ash in the form of fertilizer.

In Dunkirk (France), EcoPhos is building a new animal feed grade DCP production plant with an annual capacity of 220 kiloton. This plant incorporates the new process to treat 50 to 60,000 tonnes fly ash.

It will be the first industrial plant in Europe processing these ashes.

Source: Dutch Water Sector

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