Dams and other forms of coastal infrastructure play a vital role for the Netherlands. Since The Hague is a city that is partially situated on the coast and only 4 metres above sea level, these meas...Show more
Dams and other forms of coastal infrastructure play a vital role for the Netherlands. Since The Hague is a city that is partially situated on the coast and only 4 metres above sea level, these measures of protection are also crucial there.
One experimental measure, called “The Sand Motor”, was first created in 2011. As it reads on the website: “By building the Sand Motor (also known as Sand Engine), a peninsula on the coast near Ter Heijde, we try to find out whether nature can spread sand along the coast for us. It goes without saying that the Dutch government is not experimenting with the safety of its people: the coastal defences are now at maximum strength as the Sand Motor starts to take shape.
Between March 2011 and November 2011, Rijkswaterstaat and the provincial authority of Zuid-Holland created the hook-shaped peninsula. It extends 1 km into the sea and is 2 km wide where it joins the shore. Trailing suction hopper dredgers picked up the sand ten kilometres off the coast and took it to the right place. Two offshore replenishment locations alongside the peninsula are also part of the Sand Motor.
The Sand Motor is a great example of building with nature. By depositing a large amount of sand in a single operation, we can avoid repeated disruption of the vulnerable seabed. Nature will take the sand to the right place for us. If the Sand Motor fulfils our expectations, sand replenishment off the Delfland Coast will be unnecessary for the next 20 years.
The Sand Motor is the first experiment of its kind. With this pilot project, the Netherlands is continuing to set the standard in water management. In 2011, we are doing this by actually working with water, instead of against it. If the Sand Motor works as we expect, the concept can be rolled out to other places in the Netherlands and the rest of the world.”
There are two wastewater treatment plants (WWTP), both operated by Defluent Services that treat the water from the sewer system of The Hague.
One of the plants, Houtrust WWTP, lies in the north of the city and was originally built in 1967. It was partially renovated in 1988 and 1995 to meet the (environmental) demands of that time. Even so, around 2000 the treatment plant was showing its age and was no longer capable of effectively treating the waste water flow from the homes and companies in The Hague. Moreover, the plant could not meet the more stringent European requirements for nitrogen removal. This was sufficient reason to totally refurbish this wastewater treatment plant. In 2007 and 2008, the Houtrust WWTP was drastically renovated. With the current treatment capacity of 430,000 pollution equivalents (p.e.) the plant is able to treat the waste water from the residents and companies of The Hague and surrounding areas. On a site that covers 5 hectares, the Houtrust WWTP can treat on average almost 79,000 cubic metres of waste water a day, in other words the capacity of more than 2,600 trucks.
The biological wastewater 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 in nature, but here 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) from the waste water. After being cleaned, this waste material is stored in containers and transported to a waste incineration plant outside of the WWTP.
Harnaschpolder WWTP is just outside the Southern border of The Hague. It 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.
|Water consumption||Jan. 1, 2008 - Dec. 31, 2016||Preview chart View details|
|Composition and length of drinking water pipes in The Hague||Nov. 22, 2016 - None||Preview chart View details|