The purification process at a groundwater plant contains different number of steps depending on the quality of the raw water used. Although the raw water comes from the bedrock, one may have to take into account substances that originate from the weathering of bedrock, such as fluoride and uranium. In some areas the groundwater has also been contaminated by, for example, pesticides or road salt. At small groundwater plants in Sweden sometimes treatment is not needed at all. The water can be pumped out largely to consumers. However, there must always be the possibility of disinfection.
It is often a challenge in waterworks to keep the right moisture level. Especially considering that condensation can occur on the surface of the cold pipes and walls. The moisture load from open water surfaces poses a special challenge. It is important to keep a temperature difference between the air and the open water surfaces, which makes the water a cold surface relative to the air. Then the moisture load in the room is limited by condensation on the cold water surface. Even if the air feels dry, there is water in the air. Hot air keeps more moisture than cold. This means that the temperature at the cold surface means that the moisture present in the "dry" air can be precipitated on pipes that usually have a temperature below 10 ° C. It is the temperature of the pipes that make up the dew point and it is the one who controls the relative humidity level that must be kept in the space. In many cases, the heat is kept up in the works to lower the relative humidity level. It often helps against mould in the station but not against rust because heating does not remove the water from the air, but only allows the air to hold more water. But it doesn't help with the cold pipes! The moisture level must therefore be regulated by means of dehumidifiers in order to establish a suitable relative humidity level.
The right moisture level
What is needed is a controlled humidity level below 60% relative humidity (RH) to avoid corrosion and mould, but also to reduce bacterial growth. This requires a controlled relative humidity at the temperatures that can cause condensation on the cold surfaces - not in the air otherwise. See the Mollier chart where the curve for condensation (saturation) is indicated as 100% RH at different temperatures. We recommend having a dew point sensor connected to our dehumidifier. It then senses the temperature on the coldest surface in the room (pipes or walls) and which then controls the dehumidifier to extract as much water from the air so that condensation does not occur.
It is also important to limit the moisture load that a temperature difference is kept between the air and any open water surfaces.
We do not need to pick up any holes in the walls or pull long ventilation pipes. And our dehumidification technology is as energy efficient in cold as in hot spaces. The dehumidifier can easily be mounted with a wall bracket so that the floor is kept free in the building. Ordinary 1-phase 230V plug is enough to supply power to FLEX. The water is most easily led away with a hose to the sump or other runoff.
An Airwatergreen FLEX dehumidifier consumes on average less than 400W and a REX consumes on average less 2250W. Our dehumidifiers also only work when the moisture level exceeds the set values. It provides a cost-effective solution to avoid damage that may occur due to corrosion and bacterial growth.
At installations in Waterworks, both of our product models can be relevant. REX is used in larger spaces and FLEX in smaller spaces and where the moisture load is lower. We can assist with measurement and assessment of moisture load and give suggestions on how a suitable installation can be designed. Our FLEX dehumidifier has a capacity of 5 liters of water / day, which is more than sufficient in a smaller to medium-sized space. REX has a capacity of 30 liters of water / day, which may be needed in larger halls with open water beds and in larger pipe galleries. Each installation in Waterworks is unique and should be adapted to the moisture load that applies there.
Airwatergreen has a number of installations in the area Drinking water. In polymer rooms and filter halls but also tube galleries. In some cases, the dehumidifier works independently against the set dew point and in other cases it is connected to the existing monitoring system. The products are built to withstand the tough environment that applies with few moving parts and well thought out material choices and an IP63 classification.
Do not hesitate to contact us for a climate investigation to define the moisture levels and to design a suitable solution for your business!