wastewater

There is a country in the world that, when it runs out of space, manufactures more. And when it doesn’t have water, it recycles it infinitely. It’s not science fiction: it’s Singapore, a city-state that surpasses the six million inhabitants concentrated on an island that was barely 580 square kilometers and that today it occupies 736 square kilometers. A growth of almost 25% in just over half a century. It is not ambition, but necessity: it does not have enough land or its own rivers or aquifers, so it has had to cook everything for itself. Since its independence from the United Kingdom, it has not only increased its surface area: it has also built one of the most sophisticated water management systems on the planet, capable of converting wastewater into drinking water. of superior quality to standards of the World Health Organization. Singapore’s territorial resilience. Singapore has understood that its land and water (scarcity) problems are not independent, so it is solving them jointly and in a long-term plan (its sewage system is literally designed to last 100 years). It is the urban resilience applied to territorial development in its maximum expression, that is, the capacity of a territory to face climate, demographic and economic change through its infrastructure. A concept promoted by organizations such as the United Nations Office for Disaster Risk Reduction of which Singapore is today the most advanced student. A living laboratory in real time. If those southern geometric shapes don’t seem natural, it’s because they aren’t. Google Earth Context. The quick response to why is Singapore doing all this? It is because it lacks land and water, but reality is based on three essential axes that invite urgency: Geography. Singapore is a small island (more than New York) with a brutal population density, it does not have mountains that function as a natural reservoir or large rivers or aquifers. The rain is abundantbut collecting it in such a small field is a challenge. Strategic dependence. Historically, it has imported water from Malaysia through different agreements (the last one expires in 2061) but that represents a strategic vulnerability of the first order. Also they have imported sand from neighboring countries such as Indonesia, Vietnam and Cambodia. Climate change. Singapore is especially vulnerable to the threat of sea level rise as 30% of the territory is less than 5 meters above mean sea level. How to gain land. We enter first-class public works engineering. The traditional method consists of dredging sand from the seabed, transporting it to where it is required and filling the hole. The problem is that Singapore has run out of sand to dredge and no countries to sell it to it. As own governmentcountries such as Malaysia, Indonesia and Malaysia have banned sand exports to Singapore over the years citing environmental reasons. The second method is the dutch poldera construction that consists of setting up a dam to gain land, so that the water is then pumped outside and the soil is kept dry permanently with a drainage and pumping system, so that the land created remains below sea level. Less sand is needed, but it requires sophisticated and permanent hydraulic engineering. In any case, gaining land is increasingly expensive, complex and more delicate from an environmental point of view. Polder operation diagram. Dutch Water Sector Megaprojects to gain land. It is enough to look at a satellite map of the south of the country to see geometric shapes that do not exist in nature and that are geographical proof of their projects. And more specifically, a glimpse of some of the most impressive: Pulau Tekong. The best example of a polder is this project started in 2008 and completed in September 2025 from the hand of the Dutch Deltaresinvolved the recovery of 810 hectares of land located 1.2 meters below sea level. Jurong Island It is today a petrochemical hub, an industrial estate that was born from the merger of seven islands: Pulau Merlimau, Pulau Ayer Chawan, Pulau Ayer Merbau, Pulau Seraya, Pulau Sakra, Pulau Pesek and Pulau Pesek Kecil. Long Island It is his most ambitious and futuristic project. It will join three strips of land in the east (from Marina East to Tanah Merah) to gain 20 kilometers of coastline and about 800 hectares. How to gain water. Singapore’s water strategy is an absolute global benchmark and is carried out by the National Water Agency. Its strategy is articulated around four sources of supply (its four national taps): water from the local basin, imported water, desalination and NE water (from NEWater). The idea is simple but effective: diversify supply sources as much as possible so that, no matter what happens, the city’s supply is not compromised. And that no drop of water leaves the cycle without being reused. The first two consist of the local capture of rainwater in its network of 17 reservoirs and the agreement with the State of Johor (Malaysia), which began in 1962 and expires in 2061. For desalination they use reverse osmosis through membranes and have five plants in operation. But he tap More interesting is the NEWater, capable of covering 40% of the total demand of the country. How do they do it? With a three-stage treatment consisting of microfiltration, reverse osmosis and disinfection. The resulting water is so pure that it is used for industrial and cooling purposes. Megaprojects to gain water. Although we have already outlined the main lines of Singapore’s water strategy, there are truly impressive specific projects: DTSS (the deep tunnel sewage system): is a huge underground network for wastewater management 206 km long that is centralized in three recovery plants in Changi, Kranji and Tuas. The recovered wastewater is what is then passed to NEWater. Marina Barrage. A project that serves to get an idea of ​​the Singapore mentality: it is a reservoir built in the center of the city thanks to a 350-meter dam. It combines three functions: producing drinking water, keeping possible floods at bay … Read more