Well water among consumers is often synonymous with ideal. But in fact, she is not rare characterized by increased mineralizationespecially for artesian wells.
ferruginous water has a wide range of negative effectsso it needs to be cleaned up.
We will talk about how to independently analyze it and get rid of iron in the water in our article.
Iron in water and harm from it
Considering any impurity in water, its negative impact on the human body and its economic activity and property is assessed. As for iron, on the second point, its harm is obvious and more tangible.
- Overgrowth of water pipes from the inside with a brown coating, which in turn accelerates the oxidation and precipitation of new portions of iron from water. As a result, the lumen of the tube decreases up to complete obstruction.
- Plaque forms on sanitary ware, which is very difficult to remove.
- From glandular sediment water heaters are damaged.
- Rusty smudges remain on clothes washed in ferruginous water. This is especially important not only in everyday life, but also in the textile industry.
- Cooked food may have an unpleasant aftertaste.
In the media and society, you can often hear about the negative effects of ferruginous water on the body. At the same time, which organs and systems this metal affects is said somehow vaguely: allergies, accumulation in the liver and pancreas, risk of heart attacks. Basically common words.
According to the WHO, ferruginous water does not have such a negative effect on the human body and animals. And this is due primarily to the fact that this trace element is very poorly absorbed.
Best of all, the body takes it in an organic form from food, primarily of animal origin. In this case, the absorption coefficient depends on the content of other substances: vitamins increase it, but some compounds, such as calcium, reduce it.
Therefore, to increase hemoglobin with rusty water is a utopian hope.
Of course, with prolonged use in drinking water with a high iron content, this the metal will accumulate in the liver, eventually destroying the cells. But such water does not taste very pleasant, so the consumer is unlikely to agree to drink it.
But the truth can cause allergies, because the cause of this pathology of the immune system can be any.
How to determine iron in water? Verification and research
Qualitative analysis can be carried out at home. Usually, after flushing the well, the water from it is clear. It can put in a jar and leave for a few hoursor even days.
To speed up the reaction, water can be mixed well to saturate the air with oxygen. If the water is cloudy after soakingand then becomes brown with sediment, then this says that she is ferrous.
This reaction also indicates that this the metal in well water is in a soluble divalent formand under the action of oxygen, it is oxidized to a trivalent state, which in the form of an insoluble precipitate falls to the bottom.
In addition, the fact that iron is present in the water indicates:
- metallic taste of water;
- rust deposits on plumbing;
- stains on clothes after washing.
But such an analysis is not enough for the selection of equipment for cleaning.
Take the sample to a laboratory, such as the local Vodokanal or Rospotrebnazdor.
Where, using a photoelectric colorimeter or spectophotometer, a quantitative analysis of water will be carried out.
Iron removal methods
The removal of iron from water is called iron removal. There are many methodologies Their choice depends on several factors:
- initial water quality, including all impurities;
- the required degree of purification;
- volumes of water consumption and frequency of use of the well;
- consumer budget.
For well water, methods are applicable, the action of which is aimed at removing ferrous iron.
reverse osmosis system
This way lately enjoys wide popularity. In such installations, pressure is created that forces water molecules to move from an area of high to an area of low salt content, passing through a membrane that is permeable only to water. This process is usually preceded by passing the liquid to be purified through a coarse filter.
The degree of purification is very high. Not only iron salts are removed, but also other impurities, including infectious agents. It turns out almost distilled water. But this is the minus of the method, since demineralized water is harmful to the body.
This method can be used for universal cleaning of well water.used for drinking needs of a private house. It will be enough to install a three‑, four- or five-cassette small installation under the kitchen sink, the price of which is 7 — 80 $. It provides for the stage of additional introduction of salts into the water after purification by reverse osmosis.
If there is a desire to purify water for the whole house in this way, including for the bathroom and toilet, you can purchase a higher capacity unit with a storage tank. The price of such equipment is about 900 $, it all depends on the power.
If there is iron in the water in a concentration not exceeding 1–2 mg / l, then you can get rid of it using filters. They are loaded with ion-exchange resins, the cations of which are replaced by iron ions.
An important condition is the acidic environment of water (pH less than 7)which slows down the process of iron oxidation. In parallel, manganese is removed from the water.
But this method is not the most successful for removing iron, since resins often require regeneration and even replacement. It is often used to soften water, and iron removal occurs along the way. The cost of such an installation for a private house can be an average of 400–450$.
Cleaning methods with pre-oxidation
it the most traditional way of deferrizationused both in private homes and on an industrial scale. It includes the oxidation of water with further filtration, and in some cases settling.
For such cleaning, know the original chemistry of the liquid, especially its pH. The higher the value of this parameter, the more efficient the oxidation processes.
- Iron removal with pre-aeration is used very often and requires the least cost. This method is well suited for the removal of high concentrations of ferrous iron. Water, into which air is preliminarily supplied by a compressor, is passed through a filter, where oxidized iron settles on the load.
- A special case of such water treatment is catalytic oxidation. It is distinguished by a special filter bed coated with a film that accelerates the oxidation process. This loading modification helps to effectively remove not only iron, but also manganese.
- For oxidation in some cases, ozonizers are used, since ozone is not only a strong oxidizing agent, but also disinfects water.
Filter cost depends on the method of washing, power and ranges from 70 $. The average price of such systems is 350 $. For the effective operation of such cleaning, it is necessary to strictly follow the instructions that accompany the equipment, and it is better to entrust commissioning work to professionals.
To do this, you need any clean tank with a minimum volume of 1 m³. Water is supplied to it through an irrigation system. Such a shower is a kind of do-it-yourself aeration.
Electromagnetic iron removal
Purification of water from iron using electromagnetic waves is a fairly new, but effective method that can only be used in laboratory conditions.
Water quality standards
The quality of drinking water is regulated by the Sanitary Norms and Rules SanPin 22.214.171.1244–01. “Hygienic requirements for water quality of centralized drinking water supply systems. Quality control”.
This government document contains tables that indicate MPC of harmful substances and their hazard class. For iron, this indicator is 0.3 mg/l.
SanPin 126.96.36.1994 01 download