Upgrade of the Treatment Plant Domžale - Kamnik
The upgrade project of the CTP Domžale - Kamnik includes an upgrade of the CTP Domžale - Kamnik to the tertiary biological treatment with a sequential batch reactor technology - SBR and a construction of the input object with the adoption of the cesspool sludge.
In accordance with the Decree on the emission of substances in waste water discharges from municipal wastewater treatment plants (Official Gazette of RS, Nos. 45/2007, 63/2009, 105/2010), the area of settlement Domžale - Kamnik and the CTP Domžale - Kamnik must provide tertiary treatment until August 22, 2016, which means an additional removal of nitrogen and phosphorus. The cleaning effect of nitrogen and phosphorus compounds from waste water will be unsatisfactory under the new legislation and would - due to surplus of the concentrations - be an excessive burden to the environment.
By upgrading the biological levels of water lines the cleaning effect will be improved and, thus, the quality of the effluent, which will significantly contribute to the reduction of pollution of the river in Kamniška Bistrica will be improved, and be marked with a better ecological status. The CTP will also adopt and clean larger volumes of wastewater when rainfall from the mixed sewerage network. A safe operation within statutory limits and standards will be ensured and the excessive pollution of the environment reduced.
Subject of the project is also to build an entrance building and sludge reception. This will increase operational safety, allow a more efficient elimination of sand and larger particles, arrange adequate hydraulic flow to the CTP, increase the quantities of coarse purification of rainwater and reduce air emissions.
Intentions and objectives
The upgrade of the CTP Domžale - Kamnik has environmental importance, the objectives of which are:
- to solve the problem of wastewater treatment in the region (an area of 149,000 PE) for the 30-year period,
- to ensure safe operation within statutory limits and standards and
- to ensure a reduction in environmental pollution.
Technical solutions
Tertiary biological purification step (SBR)
An upgrade of the existing plants includes a construction of new facilities of the biological level of water lines, bins and excess sludge thickeners, a hardware pre-condensation of excess sludge and the disintegration of excess sludge before pumping into the digester, and the reduction of nitrogen in mud.
Subject to the following technological upgrades subassemblies and facilities:
- the effluent from the primary sedimentation tanks,
- distributor of water,
- sequential pools,
- object of the effluent measurement location,
- excess sludge thickener,
- hardware pre-condensation of mud,
- bins of pre-condensated mud,
- disintegration sludge,
- precipitation of phosphorus,
- a compressor station (existing facility),
- feeding an external source of carbon,
- mud pumping,
- air biofilter,
- new substation and
- reduction of nitrogen in mud
Boarding facility
Due to the increased demands of operational security, more effective elimination of sand and larger particles, achieving a greater flow through a mechanical pre-cleaning and replacement of some worn-out equipment is provided for reconstruction of the existing entrance building. At the same time there is a plan for the construction of the facility for various slurries, which are collected in two separate pools and drawn in two different locations in the digester or aerated sand trap and trap fat.
Existing entry facility, which comprises discharging an influx of rain and rough rake with a conveyor system to eject rakes culled waste in the containers will be completely demolished and built to the new entrance building as a covered single-story structure. The facility will be carried out following technological subassemblies: stormwater overflow I, coarse rakes mounted on the bypass to the discharge of waste on the system of the spiral conveyor rough electric rake, trap rock with a hydraulic device to extract the penstock precipitated sand / stones in 5 m3 of container for sand, two coarse and fine two electric rake in double kinetic and associated transport equipment for evacuation rakes culled waste in three containers (AC charging) and meter the flow of water into the device. All containers are installed in a closed facility.
The access to the facility and all three containers is from the north and south through the electro-shutter doors and is designed to allow smooth driving and loading refuse collection containers. For free access of goods vehicles in the input object will be the northern edge of the road at the entrance pumping shifted slightly to the pumping facility. On the northern part of the plot access road will be built, which will enable circular traffic through the facility mainly used for carrying containers, as this road will allow driveway waste water vehicles to the facility for receiving sludge. After completion of the reconstruction of the entrance building will be removed and the existing fine rakes mounted on the sand collector. The facility will be above the source of air pollution carried out by local exhaust, which will lead to the air cleaning in the bio-filter. The bio-filter will be located in the northern part of the input object.
In the context of the reconstruction of the entrance building will reconstruct the existing stormwater overflow at the inlet pumping station. Increase the length of the discharging overflow. Before the start of the reconstruction of the entrance building will be the inflow of water to the WWTP temporarily diverted into an existing recess. Taking here the water will shift to the input pumping station.
Facility for receiving sludge will be carried out as a two-floor structure, with two underground storage tank and the engine and part of the ground floor in which they are installed fine electromotive rake with a conveyor system and press waste. Part of the ground floor space is fitted with electrical switch blocks and place a container for collecting ograbkov. The estimated reconstruction will also reduce air emissions.
