Microporous film filter for processing heavy metal wastewater

Abstract

The invention relates to a millipore membrane filter for treating heavy water waste water, which belongs to the technical field of wastewater treatment. The filter comprises a tank body, a stainless steel tube sheet, a bulky polyfluortetraethylene membrane filter bag, filter bag support cage frameworks, an acid feeding flexible valve, a reflux flexible valve, a backsurge flexible valve, a mud discharge flexible, a cleaning agent liquid feeding valve, an air electromagnetic valve and an exhaust electromagnetic valve, wherein the bulky polyfluortetraethylene membrane bag is sleeved on the filter bag support cage framework, and all filter bag support cage frameworks are fixed on the stainless steel tube sheet through screws. The stainless steel tube sheet divides the tank body into two parts, wherein the upper part is a clean water area, and the lower part is a waste liquid area (a filter area). The filter has a simple structure, and takes a membrane made of a bulky polyfluortetraethylene material as a filter material, so as to achieve the real surface filter effect, and completely retain impurities in an acid liquid on the surface of the membrane. Because the selected membrane has excellent acid resistance, hydrophobias and smaller friction coefficient, the block phenomenon of the filter material can not occur.

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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