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For 85 years now, the competition for a new sewage treatment plant, which was supposed to replace an already obsolete sewage treatment plant in Bubenec, was over.
The Bubenec clean-room, designed by the well-known water-engineer William Heerlein Lindley and completed in 1906, after the First World War, has ceased to be sufficient for growing Prague. Its technology did not suffice for the increasing volume of sewage that Lindleys sewer system had brought, and the form of clean-up using simple mechanical sludge sedimentation was not sufficient at this time.
In 1933, therefore, the city and the Sewerage Office went on to open a competition for a new treatment plant. In the 20s, three other projects were created - two placed a new treatment plant in Reža and one on the Imperial Island. Because the professional public was unable to decide which project to choose, she had listed the competition.
The competition was launched on May 2, 1933 and ended on March 15, 1934. At the end of the competition, fifteen competition projects - thirteen competitions and two out-of-competition - were completed, which made the whole committee surprised and prolonged its decision for the whole year. The first prize was not awarded, only two, one third and a number of other projects were purchased. All of the projects have been cleansed at least in part by biological treatment, except for most of the sludge activation.
All three first projects, "Dorr" and "Clean Soil" in second place, and "Roztoky" in the third place, placed the treatment plant outside Prague. "Dorr" to Podhorí, "Clean soil" on already purchased land in Rež and "Roztoky" to Roztok u Prahy. Likewise, all three used artificial biological sludge activation, differing only with the technology used. Other projects also used other methods, such as natural biological purification by irrigation of agricultural land or using a system of biological ponds. The "Hygiene 3" project came up with the revolutionary idea of ??water purification by electrolysis, but it turned out that the aluminum consumption on the electrodes was too expensive. However, the project was purchased for its originality.
Finally, the competition did not bring about how to handle the new cleaners. Despite some success in the form of new projects, the city eventually failed to decide where to place the plant. During the Second World War, there were project relocations between Reze and Císarský Island, where the cleaner was eventually placed in the final project in the 50th Lets - the site of the Nuclear Physics Institute in Rež is located today. The completion and official start-up of the new treatment plant did not take place until 1965, and the original treatment plant operated for 60 years with the original equipment of the early 20th century.
At present, the Prague Water Supply and Sewerage System operates the Central Wastewater Treatment Plant and twenty adjacent sewage treatment plants. The total length of the sewerage network in Prague is 3,689 kilometers and 989 kilometers of sewerage connections.
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