Objective
The project is to demonstrate the feasibility of the full-scale re-use system for potable water sludge, hereby including:
- a detailed insight into the operation and design of the sludge acidification process and its influence on the functioning of the water treatment plants;
- an economic cost-benefit analysis;
- the reduction of the amount of sludge disposal to zero;
- a considerable reduction of chemicals (iron salts) for phosphate removal in pre-precipitation in sewage waste water treatment.
During the production of potable water from groundwater or surface water, in the Netherlands alone about 40,000 tonnes annually of sludge are being produced. The large volume of these sludges entails negative impacts on the environment and high disposal and storage costs.
The waste policies of the European Union and national as well as regional authorities are to stimulate the prevention of waste production and disposal as well as the re-use of waste, and to reduce the use of raw materials. Potable water sludges, which are rich in iron oxides, are currently disposed of as waste material. It is, however, possible to re-use these sludges after treating them with acid: they can be re-used as a chemical agent in the pre-precipitation process of sewage and industrial waste water treatment plants for phosphate removal.
The potable water supply company PWN and the water treatment station of the water transport company NV Watertransportmaatschappij Rijn-Kennemerland (WRK-III) produce 2,500 dry weight tonnes of sludges containing 950 tonnes of iron oxides a year. At this stage, they are disposed of. This volume represents 6-7% of the total production of potable water sludge in the Netherlands. PWN is to build and operate a full-scale acidification plant. In cooperation with WRK and the regional waste water authority Uitwaterende Sluizen Hoogheemraadschap Noord-Holland (USHN), the acidified sludge is to be re-used totally as iron salts for phosphate removal in several sewage treatment plants of the USHN.
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Programme(s)
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Funding Scheme
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
2060 BA Bloemendaal
Netherlands
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.