Chriwa has implemented a complex water treatment plant for well water and river water in Azerbaijan in 2024. Two systems, each with a capacity of 15 m³/h of treated water, supply the bottling of a regionally important mineral water brand in a newly built plant in the Kalbajar region, which became known for its rich thermal baths in Soviet times.

The treatment plant for the well water draws from a raw water storage tank 200 m away and is led into the plant through a pumping station.

The temperature of the well water is approx. 61 °C and must be cooled before treatment. The system has two coolers connected in series. The first cooler can be used for the customer's heating system in winter. In summer, a cooling tower feeds the first cooler. The second cooler is used to heat the incoming river water before treatment.

After this cooling step, the well water is impregnated with CO2 to stabilize the alkalinity of the well water and for an optimized degassing effect. After that, the water is passed through a degassing tower to remove gaseous substances and aerate the water. By increasing the pH value through the degassing tower, the well water is impregnated with CO2 again to stabilize the alkalinity.

Then, the water is passed through a sand filter to eliminate the iron content and allow for mechanical clear filtration. The water then passes through three adsorption filters in series to eliminate arsenic and other heavy metals.

After the adsorption filter, the water passes through an ion exchanger to reduce the boron content. It is then collected in a storage container. The treated water is supplied to consumers via a pumping station.

Before the water is sent to consumers, it can be mixed with the treated river water to achieve the desired quality.

The mentioned river water is treated separately and first filtered through a mechanical pre-filter and can be heated if necessary.

It is then passed through an ultrafiltration unit to obtain very clear filtered water, which is collected in an intermediate storage tank. The filtered water is used for backwashing the ultrafiltration system and for feeding the next treatment stage of the river water, reverse osmosis.

The resulting permeate of the reverse osmosis is impregnated with free chlorine and then collected in a storage tank. The product water then passes through an activated carbon filter into the mixing device (mixing with well water) and into production. The chlorinated water from the storage tank is also used externally for households and utilities.

The reverse osmosis purification device can also be used to purify both water treatment plants. Cleaning can be carried out in individual cleaning circuits.