Sludge dewatering membrane filter press and filtration method thereof

Abstract

The invention relates to a sludge dewatering membrane filter press and a filtration method thereof. The membrane filter press mainly comprises a framework part, a filtration part, a hydraulic part and a PLC (Programmable Logic Controller) automatic control part, wherein the framework part comprises a main beam connection base and a thrust plate, and the upper end of a main beam is provided with a pressure plate; the filtration part comprises a membrane filter plate and a frame type filter plate and filter cloth; a hydraulic cylinder of the hydraulic part is installed on the base, and a piston rod of the hydraulic cylinder is connected with the pressure plate; and a sludge thickening tank is provided with a blender and a feeding pump, and a feeding pipeline is provided with a control valve and is connected with the feeding pump. The filtration method is characterized by adding an organic flocculant in the sludge thickening process. By using the sludge dewatering membrane filter press and the filtration method thereof provided by the invention, the sludge filtration speed is high, and the sludge can be subjected to quick solid-liquid separation under the thickening action of the added organic flocculant. Besides, the filtered sludge cakes can be used as organic fertilizers in the farm field, and can be also used for incineration power generation in a power plant to save the energy, thereby fully achieving the effect of waste reutilization.

Description

technical field [0001] The invention relates to a sludge dewatering diaphragm filter press. [0002] The invention also relates to a diaphragm filter press and a filtering method thereof. Background technique [0003] The filter press is the main filter equipment for sludge dewatering. At present, most of the filter equipment used for sludge dewatering are belt filter presses and centrifuges. The sludge injected into the filter belt by the feed pump discharges water to form a filter cake, and the centrifuge uses high-speed rotating centrifugal force to discharge the water in the sludge to form a filter cake, so as to achieve the purpose of transporting the filtered mud cake outside. The sludge concentration method is as follows: Add about 15% filter aid to the sludge before filtering to concentrate the sludge. The filter aid is composed of known technologies (ferric chloride, diatomaceous earth, calcium carbonate), but these two kinds of equipment are used to filter the slu...

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Problems solved by technology

[0003] The filter press is the main filter equipment for sludge dewatering. At present, most of the filter equipment used for sludge dewatering are belt filter presses and centrifuges. The sludge injected into the filter belt by the feed pump discharges water to form a filter cake, and the centrifuge uses high-speed rotating centrifugal force to discharge the water in the sludge to form a filter cake, so as to achieve the purpose of transporting the filtered mud cake outside. The sludge concentration method is as follows: Add about 15% filter aid to the sludge before filtering to concentrate the sludge. The filter aid is composed of known technologies (ferric chloride, diatomaceous earth, calcium carbonate), but these two kinds of equipment are used to filter the sludge The shortcoming of the effect is that the mud cake filtered by the centrifugal force of the centrifuge still contains a lot of water due to the fact that the shaft roller of the belt filter press squeezes the mud cake on the filter belt in an instant and the water in the mud cake is difficult to quickly discharge. High moisture, due to the high moisture content of the mud cake, the sludge cannot be transported after filtration, which affects the normal daily treatment capacity and working environment of the sludge. At the same time, the components contained in the filter aid in the mud cake cannot be recycled, which still affects Cleanliness of the environment

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