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Status Task 03

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The substitution of iron salts by aluminium salts at the Damhusaaen WWTP started in February 2006 and continued until August. The period of substitution was prolonged because of a higher processtime at the plant, but this is due to other reasons than the substitution. The dewatering of the sludge has taken place at Damhusaaen, and at AWS a separate batch of sludge has been incinerated, thus producing lighter bio ash. This ash has been used in concrete at Unicon, and the concrete has a slight tint of light red. The appearance of the concrete has been assessed both subjectively and objectively.

A memo regarding the Chemical composition of European bio ashes has been written as a part of Task 3.  

Final report for Task 3 is completed.

Tiles made of concrete (A) without bioash B) with light ash and C) with "normal" bioash.

Bio-P tanks

Aeration tank

Status per 2008.09.25