如何通过技术帮助解决缺水问题
地球上有足够的淡水来满足每个人的需要。然而,全世界仍有九分之一的人缺乏安全的饮用水。技术可以发挥关键作用。
日期 2023-11-28Population growth, urbanization and changing lifestyles only make the limited supplies of safe drinking water even more scarce. By 2030, we will only have enough water supplies to satisfy 60 percent of global demand. In many developing regions already struggling with lack of fresh water the supplies will satisfy less than 50% of demand. There is no magic bullet – but technology has a critical role to play. Waterless toilets, ingenious water purification systems and water-efficient plants could play a key role in ensuring that everyone gets access to the water they need. Another example comes from one of our customers.
In the economic and commercial capital of Karachi, Pakistan, they are producing more than 4 million m3 of drinkable water yearly for over 100,000 homes and businesses. Read more below.
Convert seawater into drinkable water
With a growing population of close to 14 million, the city faces an increasing demand for potable water from its primary source, the Indus River. In 2000, one of the largest housing authorities in Asia began an international search to look for a solution that would provide a new source of drinkable water. As a result, DHA Cogen Ltd (DCL) was formed as a joint venture between Karachi's Defence Housing Authority (DHA) and Sacoden Investments of Singapore.
DCL has initiated and installed Pakistan's first co-generation plant to produce both electrical power and potable water. They chose to use Alfa Laval technology to solve its potable water issue because of the innovative desalination process that turns seawater into fresh potable water. Based on the concept of co-generation, the plant uses waste heat from one piece of equipment to run another piece of equipment. Co-generation makes the plant highly efficient in terms of energy consumption by using exhaust steam from the steam turbine as heat source for the desalination process, which reduces energy costs.
Because the plant also has a very large intake of seawater compared with the output of freshwater, the water returned to the sea has a salt concentration that is low enough to be safe for the marine life and the seabed in the area. And it regulates the water temperature ensuing that it is harmless to the local marine environment.
The plant has been up and running since the beginning of April 2008. It produces 94 megawatts of electrical power and about 4 million m3 of drinkable water yearly, providing water and electricity to more than 100,000 homes and businesses in Karachi.
Four facts about water
- Only 1% of all water on the planet is drinkable, and two-thirds of what is drinkable is inaccessible
- About 880 million people lack access to safe drinking water
- Bad water causes more than 2 million deaths each year, most of them children
- About 3,600km3 of water is withdrawn for human use annually. Of this, 70% goes to irrigation, 20% to industry and 10% is used by households
![water 320x180](https://www.alfalaval.com/globalassets/images/media/here-magazine/no34/water_320x180.jpg)
Alfa Laval’s solutions
Alfa Laval offers a wide spectrum of solutions – from desalination and water supply systems to biological wastewater and sewage sludge treatment and systems for enhanced water efficiency and ballast water treatment, read more:
阿法拉伐致力于为全球目标而努力
世界各国领导人承诺到2030年实现17个可持续发展目标,联合国也已经通过了这个全球目标。现在,需要像我们这样的企业来共同实现。
Global Goal 6
Global Goal 6 is to ensure availability and sustainable management of water and sanitation for all. Alfa Laval offers a wide range of technologies to treat wastewater and generate freshwater. These solutions contribute to improved access to clean and fresh water across the globe.
![SDG 6 Vignette](https://www.alfalaval.com/globalassets/images/media/stories/sustainability/sdg-6-vignette.png)