In present thesis, the sludge blanket controller for clearing the sludge out of waste water is presented. My work started with gathering of information about industrial waste water treatment and with undrestanding the corresponding chemical processes that take place before the sludge is accumulated in the waste water cleaning device. For cleaning the accumulated sludge, the most appropriate electronics system turned out to be the electronics with a sensor that measures the sludge thickness on the water trough the receiving and transmission diodes. This system uses the information from the sensor to adjust the information capure spreed via the frequency converter. When installing the presented sludge blanket controller, first the process needs to be monitored to determine the optimal withdrawal of the sludge. In the case where the sludge removal speed is too small, the sludge can gradually sink toward the bottom and is mixed with clean water, while in the case where the sludge removal speed is to fast, too much clean water is removed. In the presented electronics, the sludge removal speed is regulated with three potentiometers, each adjusted for its own sludge thickness. The first potentiometer is used to set the speed for a small amount of sludge, the second potentiometer is used to set the speed in larger quantities of sludges and the third potentiometer, serves to adjust the speed of the dipper in the maximum quantity of sludge.
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