Almere has a separate sewer system with ca. 1600 kilometers of sewer, in which the water is pumped by means of 298 sewage pumps. The accounting depreciation period of the sewage system is 60 years, but the municipality only replace a large scale if the system no longer functions properly. This means that it is difficult to predict when exactly will emerge the great wave of replacement sewer. The next 4 years, the municipality expects no large-scale replacement of drains.

Waste flows sewage

At this time, only residual flows that will release is when a local operation is necessary in order to get the system again functional. It therefore involves relatively numbers released in 2016 involved the following quantities:

• 18 tons of asphalt, costs € 560, - per tonne;
• 1010 m plastic pipe 125mm, cost € 10 300, - in total;
• 21 YOU gully heads, cost unknown;
• 30 YOU troittoirkolkkoppen, cost unknown;
• The chambers can be assumed that for each subscribed one is removed.

Sewage sludge from sewers, drains, ground

Every year the municipality cleans sewers, drains and ground, releasing sewage sludge. This sludge is potentially an interesting residual because it is not yet processed at this time. It involves the following quantities:

• 2015: total discharge of 1,780 tonnes, this was a great year;
• 2016: until 08/01/2016 discharge of 984 tons, this is a normal amount.

Now released sludge is dumped at Braambergen as capping ground, but it may also be used in a sludge digester, which can be made with the addition of heat biogas. Currently, among others Waterschap Zuiderzeeland runs such a plant, perhaps this has possibilities. Cleaning costs and revenues and deposit can not be reduced at this time, because it is integrated into existing contracts.


Most current contracts of the municipality for the maintenance of public spaces are 'RAW specifications'. Basically, the municipality in this standard 'RAW specifications' gives ownership of the released material to the contractor. Reversing the ownership of the released nutrients will lead to more or less work. This should take into account the Environmental Management Act. This states that if the client wants to get rid of certain building materials, legal and economic ownership of these materials is transferred to the contractor. On the basis of this Environmental Management Act can only be transferred to the contractor if these building materials should not be issued to a licensed establishment under the Act.

Municipal ownership

It is good to realize that these quantities (sewers and sewage sludge) are about the system that manages the church. The residues which are removed from the wastewater in the sewage treatment plant on the industrial canal owned by Waterschap Zuiderzeeland.