Microporous Membrane Filter for Treatment of Heavy Metal Wastewater

Abstract

The invention relates to a microporous membrane filter for treating heavy metal wastewater, which belongs to the technical field of wastewater treatment. The invention includes: tank body, stainless steel flower plate, expanded polytetrafluoroethylene film filter bag, filter bag support cage, acid inlet flexible valve, backflow flexible valve, backwash flexible valve, mud discharge flexible valve, Detergent inlet valve, air solenoid valve and exhaust solenoid valve. The expanded polytetrafluoroethylene film filter bag is set on the filter bag supporting cage, and then all the filter bag supporting cages are fixed on the stainless steel flower plate by screws. The stainless steel flower plate divides the tank body into two, the upper part is the clear water area, and the lower part is the waste liquid (ie filtration) area. The filter has a simple structure, and the film made of expanded polytetrafluoroethylene material is used as the filter material to achieve a real surface filtration effect, so that all impurities in the acid liquid are trapped on the surface of the film. Because the selected film has excellent Acid resistance, non-stick and very small coefficient of friction ensure that the filter material will not be clogged.

Description

technical field [0001] The invention relates to equipment in the technical field of wastewater treatment, in particular to a microporous membrane filter for treating heavy metal wastewater. The invention can be applied to the treatment of heavy metal wastewater and HNO 3 +HF mixed acid pickling wastewater, etc. Background technique [0002] In the previous wastewater treatment process, for some heavy metal d-block elements, such as Cd 2+ 、Cr 3+ 、Cu 2+ , Fe 2+ , Fe 3+ , Hg 2+ , Pb 2+ , Zn 2+ etc. and fluorine-containing wastewater are mainly treated by alkali neutralization precipitation method to form hydroxide precipitation with very fine particles (a considerable part is about 1 micron) and CaF 2 Such precipitation is separated by physical separation method or chemical flocculation precipitation method. [0003] Physical separation methods are mostly based on physical methods such as filtration and centrifugation. Due to the limitation of filter materials, small ...

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Problems solved by technology

[0005] (1) The processing process is relatively long and occupies a large area;

[0006] (2) The water content of the sludge discharged from the general sedimentation tank is relatively high, so the sludge treatment system is relatively large and the investment is high;

[0007] (3) The chemical flocculation-sedimentation method has high requirements for precipitation reaction conditions and poor impact resistance. When the raw water volume, water quality and reaction conditions to be treated fluctuate greatly, it is difficult to guarantee the quality of the effluent;

[0008] (4) The operating cost per ton of water of the chemical flocculation and sedimentation method is relatively high, which is mainly reflected in the cost of chemicals;

[0009] (5) Due to the complex system of the chemical flocculation and sedimentation method, the operation and management requirements are also relatively high, and a sound management system and sense of responsibility are required to achieve good operation results;

[0010] (6) Due to increasingly stringent environmental protection regulations, the threat of secondary pollution that may be caused by long-term use of chemicals added by chemical flocculation and precipitation cannot be ignored

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