Water treatment plants

    Water treatment plants (WTPs) are based on mechanical and/or biological principle, and are used for cleaning sewage water from both population and industry.

    First, a mechanical cleaning of sewage water takes place at the entry of WTP. Liquide sewage is channeled to fine machine rakes. Impurities are caught on the fine machine rakes and using a motor driving a rake conveyer, they are transported from the water to a worm conveyer. This waste is transported from there to a trash washing machine or moulding press. Cleaned water is further sent to sand catchers. Here, sand and gravel are removed from water.

    Then water goes to sedimentation tanks on the bottom of which sludge is deposited. Water continues to aeration tanks. In their water there are bacteria eating organic impurities from sewage water thus cleaning it. While the bacteria are without sewage water, they become dormant, whereas without oxygen they are dying. Therefore, water in aeration tanks must by aerated by turbo-compressors all the time. Water from aerating tanks goes to fine sedimentation tanks where the last cleaning of water and depositing of fine sludge take place. Clean water from fine sedimentation tanks goes back to the river.

    The sludge from the bottom of sedimentation tanks is transported to concentration tanks and consequently to decomposition tanks where it is cumulated and heated from the bottom to speed up the process of decomposition.

    During the decomposition process, gas is produced and stored in gasholders. This gas can be use for the production of electricity which can be used by WTP for its own power supply.

    In Slovakia, there is a directive on water treatment plants. According to this directive, each city having more than 10 000 inhabitants must have a water treatment plant on the level of European register by the end of year 2008. WTPs must be operated in villages which have more than 2000 people too. WTPs in village must be built by the end of year 2014 at the latest. WTPs are important for the preservation of clean rivers and surroundings for our children.

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    If you decide to build a water treatment plant we are ready to help you. Our company is focused on the design, development and production of control systems in industry. We can prepare for you all project documentation, design, produce and install control systems, added with software, including putting WTP into operation. Control systems can be connected with visualization on remote PCs (in control centre), providing you with the monitoring of all WTP functions from one place. It is also possible to archive measured values in a database or export daily/monthly reports. Of course we are can provide for you service after WTP goes into operation.

letecky pohlad 

Reference applications

WTP Slovnaft, Bratislava

    This industrial water treatment plant is for cleaning sewage water coming from oil refinery Slovnaft. Its function is to clean liquid impurities which are produced in the factory. In the WTP we developed a system for controlling mechanical cleaning by fine mechanical rakes. This control system is specific in that it is designed for operation in explosive surroundings. Here, we used e.g. analyzers of gas and oil substances.

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WTP Petržalka, Bratislava

    This water treatment plant is for cleaning sewage water coming from inhabitants in suburb Petržalka. We implemented here the measuring of quarter-hour energy consumption maximum, controlling of rakes, and controlling of two turbo-compressors (one small and one big). The control for turbo-compressors provides aeration for an activation tank. Rakes, quarter-hour energy consumption maximum, and turbo-compressors controls are interconnected through optical cables and Ethernet with visualization in the control centre. The visualization is our work too. Using this visualization, operators can monitor current values and water treatment plant status directly from the control centre.

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WTP Vrakuňa, Bratislava

    This treatment plant is for cleaning sewage water coming from inhabitants in Bratislava. We implemented here the control of preliminary cleaning of sewage water at the entry of the WTP with using machine rakes, the control of measuring of water level in decomposition tanks. In gasholders containing gas produced in this decomposition process we implemented the measuring of gas volume. We developed visualization for all water treatment plant which is monitoring the actual status of plant from the control centre. The visualization records actual values in a database and, based on this database, reports are produced (daily and monthly) for later use.

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