Waterworks (4): the sand filter building - filter aeration

The sound was recorded in the course of aerating the sand filter.

Water from the settling tank where most suspended matter was removed, goes into the filter building. In the sand filter building, the water goes through the filter bed. Contaminants are trapped by the sand in the voids between the grains. Aeration of the filter includes starting the blowers and introducing air into the filtration drainage in order to move the sand bed. Then the filter is rinsed.

The recording was made at the Rudawa Water Treatment Plant, which is part of Krakow waterworks. The water intake is located on the Rudawa River, the left tributary of the Vistula. The raw water from the intake is subjected to a treatment process which consists of oxidation, coagulation, sedimentation, filtration and disinfection. ZUW Rudawa is one of four treatment plants that provide drinking water for Krakow. Tap water in Krakow is of high quality and good for drinking. Its parameters are monitored on an ongoing basis by the Central Laboratory of Miejskie Przedsiębiorstwo Wodociągów i Kanalizacji in Krakow. ZUW Rudawa produces an average of 22,000 - 28,000 m3 of water per day and supplies about 200,000 inhabitants.

The information comes from: https://zuwrudawa.wkraj.pl/#/64541/0

Sound recording: Monika Widzicka
Photo: Piotr Żabicki