In 5 years, half of the people will not have access to drinking water. New types of greenhouses can save us

According to forecasts by the World Health Organization (WHO), by 2025, roughly half of the human population will not have access to sufficient drinking water. 2025 will be in 5 years.

I admit that this prediction may sound absurd. After all, the surface of the Earth consists of 71 percent. from water and we never missed it so much, so why this panic? Yes, indeed, the surface of the Earth is 71 percent. water, but drinking water is only 2.5 percent. all our water resource.

Not too much. If we add to this equation the rising temperature on our planet and many years of ignorance of many countries regarding water management, it suddenly turns out that the world's drinking water resources are not that large. Oh, and there are more and more people. You don't have to be an expert to come to the conclusion that sooner or later you will run out of water.

Well, unless we start drawing it directly from the sea

The idea of ​​converting seawater into drinking water is by no means new. Such projects have been operating for many years in the United States, Israel, China, Spain, Australia and Dubai. The biggest problem when it comes to desalinating water remains the cost of the process. Dubai authorities can afford to source 99 percent. drinking water precisely by desalinating sea water. Annually, however, they spend around USD 1.6 billion on this, while producing around 182 million liters of water per day. Less wealthy countries unfortunately have to get along with the taste.

Well, unless someone developed a cheaper way to desalinate water. Currently, one of two methods is used to obtain drinking water: evaporation or reverse osmosis. Both methods are quite efficient, but the common problem is high energy consumption for the production of desalinated water. But what are scientists for.

Researchers at Stanford University in California came up with a much cheaper idea to desalinate water. The state has been struggling with the problem of a shortage of freshwater for some time, so it's no wonder that scientists there are very interested in this problem.

A new method of desalinating water: silver and manganese oxide

Stanford scientists have developed a method that is based on the use of two electrodes made of manganese oxide and silver. The current passed through them causes the chloride ions to attach to the silver electrode, and the sodium ions to the one made of manganese oxide. In this way, salt (NaCl) is broken down into prime factors and separated from water.

Ie. separated in theory. In practice, unfortunately, it turns out that a single application of this method removes approx. 50 percent. salt from sea water. And in order to consider desalinated water safe to drink, 98% of it must be removed. salt. This method can of course be repeated several times, but it misses a bit from the idea of ​​developing a cheap, fast and effective method of desalination, so so far we are talking about a prototype of the method that requires further improvement. However, it is definitely a step in the right direction.

Since water desalination uses a lot of energy, perhaps the answer is ... cheaper energy?

Another very promising method, especially in regions characterized by a warm and dry climate, is ... creating a specific microclimate in greenhouses. Sorry for the descriptive name, I'm already explaining what's going on.

It is an idea of ​​Charlie Paton , the founder of the Seawater Greenhouse project, who said that places such as Oman, Australia and the United Arab Emirates are so dry and hot that water evaporates instantly and without using any additional energy.

Okay, but free evaporation alone does not solve the problem of recycle water. And here, all green, there are Paton's greenhouses, irrigated with evaporated seawater and powered (mainly by ventilation) with electricity produced by solar panels.

It works extremely well. Sea water, the so-called brine, is exposed to solar energy, which separates the salt from the evaporating water. This moist steam then irrigates the plants grown in the greenhouse, and is additionally filtered by them, thanks to which its excess is used for drinking and irrigation of nearby areas. This idea, in addition to the considerable advantage of obtaining potable water, also allows you to grow plants in places where it would be normally impossible.

Such cooperation between our technology and plants also allows for the retention of more water in the soil and in the plants themselves, which has a very positive effect on retention and broadly understood water management. Hence the appeals in our country not to mow lawns during drought. Effective methods for obtaining and recovering drinking water are becoming an increasingly important issue. And it's not just about some remote desert countries. Drought is becoming a regular problem also in Poland. The situation is not yet so dramatic as to interest the public opinion, so it will be a while before we start to worry about this problem on a large scale, but let's not be under any illusions. This problem exists. And it gets bigger every year.

In 5 years, half of the people will not have access to drinking water. New types of greenhouses can save us


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