summary
Evides Industriewater is responsible for treatment of the waste water originating from a large number of industries at the industrial complex of Sloe (Vlissingen). To that cause and by means of a DBFO (Design, Build, Finance & Operate) scheme, Evides Industriewater has constructed a waste water treatment plant based on the active sludge process based on in-house expertise. The treatment plant has a capacity of maximum 50,000 p.e. While Evides Industriewater guarantees a reliable treatment of their waste water, the industries can do with a minimum effort with respect to waste water treatment while focusing on their core business.
outsourcing of waste water treatment
At the time of development of the Sloe area (currently the Vlissingen-East harbour area) into an industrial park for heavy industry, no central facilities for the collection and treatment of waste water were available. However, the authorities expressed the idea to connect the companies to a sewerage system with subsequent treatment of the waste water beyond the boundaries of the Sloe area.
Evides ordered a study to be carried out into the sewerage issues in the harbour area, in which the previous and future waste water quantities were mapped out. Following analysis of the results, it appeared that installing both a sewerage system and a collective waste water treatment plant for treatment of industrial and domestic waste water in the harbour area itself offered advantages to all parties involved.
A sewerage system to a local treatment plant results in a reduction of costs in comparison to transportation towards a plant outside the harbour area. Additionally, the companies were prevented from having to invest in their own treatment plants and thus were able to delegate this non-core activity to a third party. And finally, industrial waste water is often single-sided by composition, as a result of which the operational management of treatment processes can be complex. Collective treatment of all waste water streams in the harbour area produces fewer of these types of problems. The efficiency of treatment is higher in the event of collective treatment of different waste water streams, while the relative investment (per population equivalent) is less.
project details
In 1995, Delta Afvalwater BV (a 100% subsidiary of Evides Industriewater) was established for the purpose of constructing the waste water treatment plant and treatment of the waste water for the companies situated in the Sloe area. The construction of the sewerage system (including pressure pumping station) and the waste water treatment plant were completed in 20 months. The plant entered active service in 1997. Currently this waste water treatment plant treats the waste water of 60 connected companies.
The operation of the waste water treatment plant is fully automatic allowing remote control from a different location (operate-by-wire); full data logging allows the process data to be recorded and analysed by expert process engineers at the headquarters of Evides Industriewater. Process technologists and process engineers of Evides Industriewater are responsible for management and maintenance in order to guarantee full compliance of the performance with contractual obligations and applicable legislation.
| Active sludge capacity |
50,000 p.e. |
| Volume carrousel |
2,750 m³ |
| Volume clarifier |
1,200 m³ |
| Volume sludge thickener |
150 m³ |
| Volume sludge holding |
1,000 m³ |
| Capacity aerators |
120 kW
200 kg 02/h |
| Capacity effluent pumps |
350 m³/h |
For more details please refer to the
brochure of this project.