After evaporation, the amount of sugar would be 0. Then, I want to talk about the TDS and safeness of various kinds of water that we can see around us. When we boil groundwater from the European region, limestone is left. It is hard for Koreans to understand this situation. How could Europeans drink water containing limestone? However, Europeans are very healthy and drink water without any doubts.
Why is that? Water bottles have labels indicating a TDS figure. TDS of bottled water from the Alps is more than ppm. However, that of bottled water in Korea is only 30ppm.
Korea is famous for clean water and good mountains. It is rare to find a country whose water is as clean as that of Korea. The spot from which we get water is different but it is usually ppm. You may be confused about this fact because this figure of Korea is similar with that of European countries. How about the water from the water purifier attached to the faucet? Some water purifiers have TDS and some removes it but their TDS figures are not really different from those of tap water. Also, if we compare the upper region of the river with the lower one, it would be obvious that TDS of the lower region is higher than the upper one.
The lower region of the river has more pollutants than the upper region, so the valley water in a mountain of the upper region will have far less TDS values. Rainwater will encounter many substances from here and there as it runs down the mountain but there are few foreign substances flowing from nature.
Therefore, it is natural that TDS of rainwater before rainwater falls on the ground is lowest. Definitely, it is possible that pollutants such as sulfur or nitrogen oxide from the air dissolves into the rain. There is dust or yellow dust from air pollution, but it is easy to get rid of them. Some substances that were not filtered exist but its amount is very low. Their TDS is ppm. However, there is water that has lower TDS than this. That is the rainwater that the pollutants in it are washed away after rain.
Within 20 minutes of pouring rain, pollutants in rainwater are washed away. So the rainwater after 20 minutes is like distilled water. If we want to use this water, it is important to keep catchment area clean. The remaining particles will be removed if it is carefully deposited and separated from the rainwater. If we screen the sun and carefully pay attention to the water storage system, the water can be saved months.
In this way, people in regions far from a city have used rainwater. Of course there was nothing to worry. Thus, you can definitely use rainwater. The purest water in the world is rainwater! However, people think they cannot get the special water because they are not rich like a queen.
How pitiful the sky is! As the mirror taught, a servant brings rainwater to the queen, but is it possible for her to stop her pickiness? I understand that the acidity of the rainwater is not dangerous enough to worry.
However, even though rainwater is clean, it will be dirty soon because of air pollution! Most of people will also be picky about this issue because of yellow dust rain as well as acid rain. We just call the rain accompanied by yellow dust yellow dust rain. Our misunderstanding mentioned above begins with the lack of knowledge about the difference between air pollution and water pollution.
It is not true that some substances exposed to the polluted air are dangerous in regard with water pollution. It is not different from the thought that the person who has dark skin would have a dark mind. In other words, pollutants in the air do not contaminate the surrounding water. Some substances affecting our respiratory tract come into the nose, and the membrane in our nose is relatively weak. However, since drinking water is supplied to people after water treatment, there is a huge gap between air pollution and water pollution.
When you are in your room, suppose that your mother put some hot pepper powder into the plate to make Kimchi, which is one of the Korean traditional foods. At this moment, you will sneeze even to a little bit of hot pepper flying around.
However, that amount of hot pepper powder mixed with water will have no flavor and no effect on our body. The same principle is applied to the relationship between air pollution and water pollution. The unit indicating the level of air pollution and water pollution will help you understand.
Do you understand what I said? Is it still difficult? That is to say, for the same substances, they are not a problem in the water quality standard until the level of air pollution exceeds million times of the standard. Even though air pollution is severe, water quality standard never reach million times of the standard in reality. Evidence that yellow dusts are easily separated from water is yellow dust left on the surface of a car. Even without this kind of unit system, just think about muddy water that overflows in summer.
Since the water facilities of Korea is quite nice, muddy water is handled and supplied to us in spite of its great amount over million to ten million times of yellow dust. Among air pollution substances, the standard of Sulfide and Nitride is far smaller than that of water pollution.
In the standard of water pollution, there are no defined substances but it uses Total Dissolved Substance, the sum of a negative ion and a positive ion.
In the matter of the effect of inorganic substance on our body or recommended amount, experts in WHO reviewed and set the water pollution standard of drinking water. Of course, before figuring out the effect of air pollution substances on water quality, firstly we should reduce materials that cause air pollution and try to meet the safety standards.
However, as I mentioned enough earlier, the reason we have to do so is not because rainwater is polluted, but because we should prevent corrosion of buildings and respiratory diseases. Are your concerns washed away now? If someone still has doubts, and asks me questions again, there is nothing I can do.
If you keep reading this book though, your anxieties will gradually disappear. Suppose that one company is criticized because of its corruption and tax evasion. This kind of things frequently happens. It is unfair that they seem to have problems only because they are the members of that company.
The Department of the Environment insisted that the quality of the river could be improved with a great amount of money to prevent Nonpoint Source. Although they may have tried to improve the quality of water by managing rainwater, the quality of water has not been improved despite trillions of investment for several years and thus blamed rainwater for water pollution. Anyways, their purpose should have been improving the quality of water but word choice seems like a problem.
What comes into your mind when you hear the source of rainwater pollution? You will immediately think that rainwater equals the source of pollution. The latter acquires a lot of rainwater during times of torrential downpour. Rainwater is also considered to have lower levels of pollution, mold, pollen, and other kinds of contaminants compared to our public water supply. Keep in mind, though, that rain can and does pick up some amounts of bacteria as well as dust and even the occasional insect parts, so it is crucial that you filter rainwater before you attempt to drink it.
So what are the considerations you should keep in mind when drinking rainwater? While it is mostly safe, you should steer clear of drinking it if it falls near any radioactive sites, such as Chernobyl or Fukushima.
Likewise for rainwater that falls near chemical plants and factories. Finally, common sense will tell you not to collect any rain that has fallen directly on the ground and collected into puddles. The best and safest way that you can collect rainwater is by using storage containers made specifically by a reputable company that produces steel rainwater tanks for the purpose of directly harvesting rain.
If you live in an urban area you should filter your rainwater if you are going to drink or cook with it. There are two ways by which you can do this: boiling and filtration. Most rainwater is safe to drink. The levels of pollution , pollen, mold, and other contaminants are low — possibly lower than your public drinking water supply. Keep in mind, rain does pick up low levels of bacteria as well as dust and occasional insect parts, so you may want to treat rainwater before drinking it.
Two key steps you can take to improve the quality of rainwater are to boil it and filter it. Filtration, such as through a home water filtration pitcher, will remove chemicals, dust, pollen, mold, and other contaminants.
The other important consideration is how you collect rainwater. You can collect rainwater directly from the sky into a clean bucket or bowl.
Ideally, use a disinfected container or one that was run through a dishwasher. Let the rainwater sit for at least an hour so heavy particulates can settle to the bottom.
Alternatively, you can run the water through a coffee filter to remove debris. Although it isn't necessary, refrigerating the rainwater will retard the growth of most microorganisms it could contain. Most rainwater is naturally acidic, with an average pH of around 5. This is not dangerous. In fact, drinking water rarely has a neutral pH because it contains dissolved minerals. Approved public water could be acidic, neutral, or basic, depending on the source of the water.
To put the pH into perspective, coffee made with neutral water has a pH around 5. Orange juice has a pH closer to 4. The truly acidic rain that you would avoid drinking might fall around an active volcano. Otherwise, acid rain isn't a serious consideration. Reddy, Avanija, et al. Actively scan device characteristics for identification.
0コメント