WWTP Harnaschpolder

Coordinates: 52.0162744, 4.3167138
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Water and sanitation


The Harnaschpolder waste water treatment plant (WWTP) has a treatment capacity of 1.3 million pollution equivalents (p.e.), which makes it the largest in the Netherlands and one of the largest in Europe. On a site that covers no less than 25 hectares, Delfluent Services treats the waste water from more than 1 million inhabitants and around forty thousand companies in the region of The Hague. On average, the WWTP can treat 255,000 cubic metres of waste water a day, in other words the capacity of more than 8,000 trucks. Construction of WWTP Harnaschpolder started early 2004. By the end of 2006 the WWTP was taken into operation.

The biological waste water treatment process is as ingenious as it is simple: we employ billions of micro-organisms that do the actual work for us, they literally consume the waste material in the water. In fact this is exactly what happens naturally, but then in a controlled way and on a large scale.

The entire treatment process is fully automated. The operator can log in remotely and, if required, intervene. Pumping stations transport the waste water from the municipalities to the WWTP.

Immediately on arrival, remove the large solid materials (paper, plastic, wood, textiles, etc.) from the waste water. After being cleaned, this separated waste material is stored in containers and later transported to a waste incineration plant outside of the WWTP.

Record history

Date Name Changes
Feb. 28, 2019, 2:31 p.m. Carolin Bellstedt Reference space create from source document