Method and device for detecting blockage of filter material in water treatment filter

Abstract

The invention provides a method and a device for detecting blockage of a filter material in a water treatment filtering basin. The device comprises a radar liquid level meter arranged in a waste water region at the upper part of the filtering basin, a pressure transducer arranged in a clean water region at the lower part of a filtering plate of the filtering basin, and a pneumatic control valve arranged at a place where a water discharge pipe of the filtering basin is, wherein the radar liquid level meter, the pressure transducer and the pneumatic control valve are connected to a PLC control system. The method comprises the steps that the PLC control system calculates out a blockage value psi of the filter material in the filtering basin based on a filtering basin practical water level detected by the radar liquid level meter in real time and a pressure at the lower part of the filtering plate of the filtering basin detected by the pressure transducer in real time; when psi reaches to the maximum blockage value, the PLC control system enters into a filter material backwashing procedure, starts up a backwashing water pump and a draught fan to backwash the filter material in the filtering basin, then stops the backwashing water pump and draught fan until psi drops to be close to zero in the backwashing process and enters into a filtering basin filtering production procedure, so the cycle. According to the method and the device for detecting blockage of the filter material in the water treatment filtering basin, frequent startup of the backwashing water pump and the draught fan, and waste of electric energy can be avoided, efficient production of the filtering basin is ensured.

Description

technical field [0001] The invention relates to the field of measurement and control of water treatment instruments in the metallurgical industry, in particular to a method and device for detecting blockage of filter materials in water treatment filter tanks. Background technique [0002] The production process of the metallurgical industry produces a large amount of alkali, acid, oily wastewater and domestic wastewater. In order to protect the environment and save water resources, the wastewater generated in the production process must be purified. The waste water from the factory is filtered and purified after passing through the grid tank for slag removal and the high-density sedimentation tank for further filtration and purification. Part of the purified water is sent back to the factory for reuse as industrial water, and the other part of the clean water is further treated and used as domestic water. [0003] The filter is an important link in the wastewater treatment a...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a water treatment filter filter clogging detection method and its device for the above-mentioned deficiencies in existing filter clogging detection, which can avoid frequent start-up of backwash pumps and fans, Waste of electricity, but also to ensure efficient production of the filter

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