Wastewater Association Reither Ache
The Reither Ache wastewater association is a supraregional community association and representation of interests according to the Tyrolean municipal code of the amalgamation of the three communities Kirchberg in Tirol , Reith bei Kitzbühel , Going am Wilden Kaiser and the city of Kitzbühel in the Tyrolean Leukental .
activity
The wastewater association looks after the upper Großache (Tiroler Achen) , which is called the Kitzbühler Ache there, and its left tributary, the Reither Ache . It treats the wastewater from a total of up to 60,000 inhabitants (due to the massive seasonal tourism, it varies greatly). This association and the resulting measures, tasks and responsibilities is one of the largest nature and environmental protection projects to protect the water quality of the Bavarian Chiemsee on Tyrolean soil, supported by the entire inhabitants of the 4 member municipalities. The association has the task of keeping the water that feeds the Chiemsee at the best possible quality, along with some other similar institutions on a municipal association basis.
The majority of the Kitzbühel district represents the water catchment area of the Chiemsee. To date, the municipalities on the Bavarian and Tyrolean side have invested well over 500 million euros in protecting the Chiemsee in the form of technical systems. Overall, the Chiemsee protection projects on the German and Austrian side are one of the largest and most important, as well as cross-border environmental protection projects in Europe, with a great role model effect.
History of origin
In 1973, the municipalities of the Grossache (Tiroler Ache) were advised or prescribed by the Innsbruck Cultural Building Authority to sewer and build sewage treatment plants. In particular, the Bavarian municipalities in the area of the Chiemsee pushed for the upcoming projects to be completed quickly, especially since all sewage due to the hydraulic situation and the watershed of the entire catchment area ultimately led to heavy pollution in the Chiemsee and an ecological tipping of the Chiemsee had to be feared in the medium term. As early as June 1975, the first draft of the statutes of the Grossache cleanliness association was drawn up.
At that time, Kitzbühel, Kirchberg in Tirol, Reith near Kitzbühel, Going am Wilden Kaiser, Oberndorf in Tirol , St. Johann in Tirol and Kirchdorf were all members of the association . In 1977 the communities of Aurach bei Kitzbühel and Jochberg were added. In 1978 a general project by the Grossache Cleanliness Association followed, with a cost comparison between the Going am Wilden Kaiser site and a sewage treatment plant in Erpfendorf.
In 1982, however, the decision was made to found its own association, from which the Wastewater Association (AWV) Reither Ache was created with the four member municipalities. The first constituent meeting of the association produced the following results: Mayor Mitterer from Going am Wilden Kaiser, Deputy Mayor Noichl from Kirchberg, other members: Mayor Hölzl from Reith bei Kitzbühel and Mayor Brettauer from the city of Kitzbühel. The municipality of Going am Wilden Kaiser was set as the legal seat of the AWV Reither Ache. The civil engineering office Kirchebner from Innsbruck was commissioned to plan the sewage treatment plant and the collecting sewer network. In 1983 the construction of the main collector sewer network and in 1984 the construction of the sewage treatment plant began.
In the end, just before the end of 1987, before the final completion of the circular sewer system around the Chiemsee itself by the Bavarian municipalities, the message “Sewage treatment plant and collecting sewer network finished”. Mayor Mitterer was the chairman of the community association until 1989, after which Mayor Trixl took over until 2004, as well as Mayor Josef Pirchl from the community of Going am Wilden Kaiser until 2016. From March 2016 to March 2022 (current electoral period until 2022), Mayor Alexander Hochfilzer from Going am Wilden Kaiser is the head of the association, responsible for its environmental relevance and areas of responsibility.
Over the years, the Reither Ache wastewater association has developed an intensive collaboration with the surrounding associations of the same kind, as well as with the Bavarian colleagues in the Chiemsee area. For example, Lorenz Kollmannsberger, the long-time chairman of the Chiemsee wastewater association and mayor of Prien am Chiemsee, has repeatedly honored those responsible for AWV Reither Ache for their prudence in environmental matters to protect the Chiemsee, and a long-term, cross-border partnership in the interests of nature has developed.
Technical description of the system
The wastewater arrives in the main sewer network (diameter 500–800 mm) on the right bank of the Reither Ache to the sewage treatment plant in Going. The wastewater treatment practiced here essentially takes place in a mechanical and a biological treatment stage, the phosphate precipitation is carried out by adding precipitating agents .
During mechanical cleaning, the coarse material that accumulates in the wastewater is first removed using automatic sieves (5 mm gap width). The screenings are then washed, pressed and thrown into a container. The wastewater now flows on to the sand trap . This is designed as a ventilated long sand trap with a grease trap on the side. The sand-sludge mixture is fed to the sand washer, which has the task of holding back the sand. The washed out sludge is fed to the plant. After the sand trap, the amount of wastewater inflow is determined by means of a radar measurement. The next cleaning step takes place in the two primary clarifiers . These were designed as rectangular basins with longitudinal flow, the sludge removal is carried out using a shield scraper. The sludge produced here is temporarily stored in the pre-thickener and then fed to the digestion tower.
The wastewater, which has been mechanically cleaned in this way, flows through a distribution channel to the biological treatment stage. The biological stage has two lines with upstream denitrification and a subsequent circulation basin. Surface aerators are installed in the area of the pool brine in the circulating pool in order to ensure an even supply of oxygen. The oxygen content is controlled by means of oxygen probes. After passing through the two activated sludge tanks, the activated sludge mixture reaches the four secondary clarification tanks through a rectangular channel with a distributor tongue. This is where the purified wastewater and activated sludge are separated.
The up to 98% purified clear water flows through the aluminum channels and the subsequent drainage channel into the receiving water (Reither Ache) and ultimately into the Chiemsee.
The activated sludge deposited in the secondary clarifier is returned to the biological cycle. Part of it is fed as excess sludge to the mechanical sludge sealer (disc thickener). The thickened sludge is placed in a 1700 m³ digestion tower heated to a temperature of approx. 38 ° C. The warmth causes bacteria in the sludge to generate digester gases . These are diverted and temporarily stored in a 580 m³ gas storage facility. If necessary, the gas is used by two micro gas turbines in the combined heat and power plant . The digester gas is converted into approx. 1/3 electricity and 2/3 thermal energy. With the two turbines, a self-sufficient electricity coverage of currently 117% can be achieved for the operation of the complete sewage treatment plant. The excess 17% electrical energy is fed into the public grid as green electricity.
The digested sewage sludge from the digestion tower is temporarily stored in the post-thickener, then dewatered using a centrifuge and stored in containers for final recycling by a disposal company.
In 2013, an additional 544 m 2 photovoltaic system with an output of 84 KWp was built. The electricity generated there is fed entirely into the public grid as green electricity. On October 23, 2013, the wastewater association Reither Ache was presented with an award for the innovative, self-developed, efficiency-increasing execution of module assembly with the process exhaust ventilation system for defrosting the modules in winter and cooling in summer as part of the e5 Gala in the Innsbruck Congress Center.
Web links
Individual evidence
- ↑ Chiemsee-Ringkanal ( Memento of the original from October 22, 2010 in the Internet Archive ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice.
- ^ Association website
- ↑ Energie Tirol: Exemplary communities honored at e5 Gala ( page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.
