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Currently, according to statistics, 60% of the country’s population uses the wells used for domestic use, production and business. Drilled well water is an underground water circuit, depending on the depth, geographic area, to assess the cleanliness of the well water. So with this article MET technology would like to introduce to readers ” Application of MET treatment technology to treat polluted wells ” to help you take measures to treat your home water. .

Signs identifying contaminated well water?

1 – Water contaminated with heavy metals and ammonium.

2 – Alum contaminated well water.

3 – Well water contaminated with Fe and Mn.

4 – The well water is contaminated with lime.

5 – Saline water from well water.

Due to the source of groundwater, water from drilled wells currently carries many risks of pollution, the composition of well water contains many impurities, which can be listed below:

Water parameters of wells contaminated with alum

1 – The pH of the water.

Characterized by the concentration of H + ions in water (pH = -lg [H +]. Water properties are determined by different pH values.When pH = 7 water is neutral, pH <7 carrier water acidic and when pH> 7 water is alkaline.

2 – Water hardness.

Is the quantity representing the content of calcium and magnesium salts in water. There are three types of hardness: temporary hardness, permanent hardness, and total hardness. The temporary hardness represents the total amount of carbonate and bicarbonate salts of calcium and magnesium in the water. Permanent hardness is the total content of the remaining calcium and magnesium salts in the water. Total hardness is the sum of the two above hardness types.

3 – Chemical, organic compounds.

Human activities and production all affect the surrounding environment, including your well water source. Industrial production activities emit a multitude of chemicals that cause countless harms. With this environment, everyone must be aware of this. Industrial chemicals are present in well water.

In addition, agricultural production with residual content of fertilizers, pesticides and livestock breeding activities also has a great impact on your well water source.

4 – The alkalinity of the water.

Can be distinguished into total and partial alkalinity. Total alkalinity consists of the total content of bicarbonate, hydroxide and anion ions of the salts of weak acids. When natural water has a large coloration, the total alkalinity includes the alkalinity caused by salts of organic acids. The partial alkalinity is also distinguished: alkaline bicarbonate or alkaline hydrate.

5 – Heavy metals.

There are many reasons for your underground water, your well water is contaminated with heavy metals such as: Due to the mining of heavy metal ores, industrial wastes into the soil and water environment, heavy metals are present. in the sediments that the groundwater flows through.

The heavy metals in well water include: Iron (Alum), Lead, Arsenic, Mercury, Mn, Magnesium, Aluminum …

6 – Nitrite, ammonium.

Ammonium metal molecules in water. In livestock breeding facilities, domestic wastewater, fertilizers, and agricultural pesticides are contaminated with organic compounds of nitrogen that seep into groundwater.

In Vietnam, there are many livestock farms, so the water source contaminated with these toxic substances occurs quite a lot.

Limestone contaminated water

Groundwater, well water drilled in limestone mountainous areas of high calcium content in the water. The source of water contaminated with calcium is easy to recognize that it is very clear water, when boiled there will be white residue on the bottom of the pot.

Limestone contaminated well water

Why is drilled well water yellow and has a fishy smell?

The cause of the phenomenon of drilled well water yellow is due to iron contaminated water (alum). Iron in well water usually exists in the form of Iron 2+ (Fe2 +) or non-precipitated Iron oxide that exists suspended in water, causing yellow color and unpleasant fishy smell.

The yellow drilled well water has a fishy smell

Why is drilled well water opaque color and black residue, unpleasant viscosity

When many families pump water from a drilled well, the water looks very clear, but when left in the air for a long time, gold deposits appear on the bottom or scum (viscous) floating on the surface. And when he touched the tank with his hand, he saw black viscous.

The main reason causing this situation is that the well water has been heavily contaminated with Manganese. Some popular types of well water today are:

– Saline water (commonly found in Mekong River Delta and Central Coast);

– Water contaminated with iron and manganese (found in the Red River Delta region);

– Water contains a lot of armoni and arsenic (common in big cities with developed industries and densely populated populations);

– Water has a high concentration of calcium (commonly found in the Central Highlands);

Drilled well water is cloudy in color and has black, viscous sediment

Why does drilled well water taste salty?

Our country has about 1 million hectares of saline soil. Accounting for about 3% of the country’s natural area. Saline areas are mainly in the Mekong Delta. There are more than 700 thousand hectares of salty and salty soil. The saline intrusion areas penetrate deep into the inner fields from 30-40km. In addition, in the central coastal provinces such as Quang Binh, Ha Tinh, Ninh Thuan … the area of ​​saline soil is up to several tens of thousands of hectares. When the soil is salty, groundwater cannot avoid being salty.

Why is well water contaminated with lime?

You can easily see that the water source in your household is using white residue on the bottom of the kettle, the thermos when it is boiled, the water pipes, in the tap of the heater, or the water supply hose of the washing machine …. Ancient folk have a way to clean the lime residue on the bottom of the kettle by squeezing lemon juice, vinegar soaked for 24 hours for calcium deposits to peel off, using potatoes to boil with water … But only a short time after the kitchen items were this unpleasant calcium white residue reappears.

The above phenomenon is due to the “hard” water source because it contains a lot of dissolved calcium and magnesium. Most wells drilled in the karst area are encountered. It not only appears in households that drilled wells by themselves but also in households using tap water in the city, due to the inadequate water treatment of the plant.

Well water contaminated with heavy metals

Current water treatment solutions for wells:

1 – Build filter tanks to treat iron alum contamination by rain rig technology.

2 – Using a well water filtration system of a composite filter column.

2 measures above: They are not able to remove solids mixed in water, and cost a real proven real life in every household.

3 – Treatment of well water by water treatment technology MET

MET technology is capable of completely removing impurities and minerals harmful to human health such as arsenic, alum, iron … At the same time retaining ingredients that are beneficial to human health , thoroughly handling to some toxic gases including: methane, hydrogen sulphide, ammonium …

Water treatment technology MET

– Principle of operation

– Outstanding advantages

– Application of MET treatment technology to treat polluted wells water

– Installation fee

– Guarantee

– Contact information

– Some products have been installed

– Video water treatment technology MET