Now that we have sediment and odor and taste problems discussed, it is time to look at more complex hazardous impurities (TLC). DC are not only aesthetic problems, which are, as the name suggests, seriously dangerous pollutants. Depending on the specific situation, ask some of DC acute (immediate) threat to health, while others are chronic (developing over time). For example, microorganisms such as Cryptosporidium and Giardia do very ill within hours, while heavy metals such asmercury, lead or in the fat body is slowly and accumulate over time. DC, who have chronic effects are subtle, the effects are not immediately seen and felt by the appearance. In any case, DC is a serious problem, with potentially fatal consequences that must not be overlooked. There are many municipalities in the DC that we need to spend time, and can take two full article, so I hope you stay with me. I'll try and worth your time!
Let's start with theto make simple DC; microorganisms. Examples include pathogenic bacteria such as E. coli, Legionella, Dysentary, salmonella and cholera, protozoa such as Giardia lamblia and Cryptosporidium pathogens and viruses such as hepatitis A and polio virus. This is not an exhaustive list, but I'm sure you've heard of the infamous murderess. The good news is that microorganisms are relatively easy to remove. If you are unable to chemicals, chlorine or bromine-injection systems are good options.It is a fuel injection pump, which pumps containing the chemical in water in the correct amount depending on the speed of water flow, which is then followed by a tank of exposure time. The exposure time is critical because all chemicals will have an impact in the world if you do not have enough exposure time. Finally, these systems usually have a type of filtration to remove residual chemicals. These systems are very effective and can often solve the other problems of watersimultaneously. For example, the injection of chlorine, a good way to oxidize dissolved ferrous iron and precipitated out, was dissolved in iron so that it can be removed by mechanical filtration.
Water Filter
For those who want to avoid chemicals, there is UV light. UV light is electromagnetic radiation with wavelengths in the range from 10 to 400 nanometers and is not visible to the naked eye. It 's very good at dealing with microorganisms, but the systems must be sized correctly to providethe right dosage of UV radiation to kill microorganisms effectively, and the water must meet the following specifications for UV rays to penetrate the water. Iron: <0.3 ppm (0.3 mg / L), Manganese: <0.05 ppm (0.05 mg / L), turbidity <1 NTU, hardness: <7 gpg (120 mg / L), Tannins : <0.1 ppm (0.1 mg / L). In other words, there is little or no iron, fresh water, and it should be clear. Once these conditions are met, UV is a very user-friendly option.
Another method to treatmicroorganisms with the injection of ozone. Ozone is a powerful oxidizing agent. Disinfection with ozone is a direct result of the disintegration of the bacterial cell wall, also known as lysis. drinking water systems with ozone are compact and easy to use, but the whole house are much more complicated, where the air-drying, and fumigation, and tanks of exposure for exposure. The main reason could be chosen this type of complex system, such as injection of chlorine able to deal with moreProblems in parallel with its ability oxidants.
One might ask why I did not mention any filter. This is because there are few systems that require the absolute level of filtration must Protection. An "absolute" filter tested up to 99% of the particles removed by filtration specifically for this filter. 99% has a 2-log reduction, a 3-log reduction would be 99.9% and a 4-log is 99.99%, etc. .. 2-log reduction is sufficient as a backup foran existing water source, such as treated municipal water, but if the community has a problem like a broken water pipe or other circumstances leading to a boil water advisory, it is necessary to reduce the 4-log 99.99% or higher. I am not aware of filters, especially at the level of the entire building, capable of this level of filtration. Properly sized, chemicals, UV and ozone systems are able to disinfect easily to a 6-log reduction. In addition, all filters are only a 2-log reductionalmost certainly a very low filtration like.2 or not. This type of filter to allow adequate flow for giant would have a common whole house water filter system. In other words, the whole house of situations, not simply reasonable. Each of the above options will be a much better choice. However, if you are looking for small water filter systems for emergencies or other special situations that require only a small amount of water, such systems areavailable and are very helpful and able to clean water. The Katadyn Vario and EX Microfilter MSR Mini works are examples.
In the next article will continue our look at the look of the DC and volatile organic compounds, heavy metals and some of the other DC.
How to select a portion of the water filter 6: dangerous pollutants
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