CN102553358B - Filter element cleaning and recycling method - Google Patents

Abstract

The invention provides a filter element cleaning and recycling method which comprises the steps of detection on physical appearance of a filter element component, performance test, analytical test, anatomy analysis, chemical cleaning experiment and recoverability test. By adopting the method, the filter element can be used repeatedly, thereby saving cost for replacing a great quantity of filter elements and reducing environmental pollution resulted from a great quantity of scraped filter elements.

Description

A kind of filter core cleans reuse method

Technical field

The present invention relates to a kind of filter core and clean reuse method, belong to the Treatment of Industrial Water field.

Background technology

In the reverse osmosis desalination system, be scratched in order to prevent reverse osmosis membrane, its front of being everlasting installs security personnel's filter additional, with except trace suspension particle remaining in anhydrating, colloid, microorganism etc.Security personnel's filter belongs to secondary filter, interior dress filter core, and its operation principle is to utilize the hole of 5 μ m to carry out mechanical filter, removes impurity such as suspension in the liquid, particulate, iron rust effectively.The PP melt-blown filter is typically used as the pre-filtering of secondary filter, be to adopt aseptic nonpoisonous and tasteless polypropylene particles, through heating high temperature, spray silk, traction, accept to be shaped and the tubulose filter core made characteristics such as have the filtering accuracy height, flow is big, pressure reduction is little, pollutant holding capability, volume are little, high pressure resistant, corrosion-resistant.Itself does not use any chemical adhesive this filter core, more meets health, the high-quality requirement of safety.

Along with water time lengthening processed, the PP melt-blown filter is because of the pollution of trapped substance, and running resistance rises, and reaches setting value (when the work pressure drop was 0.01 ~ 0.2MPa), needs are renew cartridge more when moving to inlet and outlet pressure.When especially coming water water quality inferiority or summer operation, the replacement cycle is short, and more renew cartridge is very expensive, the filter core increase in investment.Simultaneously, the filter core that changes becomes industrial refuse, contaminated environment again.

Summary of the invention

In order to overcome above-mentioned deficiency, the present invention aims to provide a kind of filter core and cleans reuse method, by cleaning the filter core that lost efficacy, makes it reach designing requirement, so that recycling, cost saving reduces the pollution to environment.

Filter core of the present invention cleans reuse method, and technical scheme is as follows:

(1) physical appearance of filter core element detects: the filter core element is estimated and weighed;

(2) performance test: detect the filter core element and under the code test situation, produce discharge and pressure reduction, and contrast with standard filter cartridges element function parameter, or compare with the original performance parameter of dispatching from the factory;

(3) analytical test: combustible loss method (LOI), it is a kind of gravimetric analysis method, pollutant residual on the filter core is being heated to 550oC after the drying under 110 oC, and to destroy the organic matter in the pollutant, high temperature makes organic matter degradation or the volatilization in the pollutant, pollutant weight before and after the weighing heating, with definite organic contamination percentage, and determine whether it is biological pollution, generally, dry matter content shows usually that less than 20% o'clock major part is biological pollution in the organic contamination;

(4) dissection and analysis: axially evenly cut 2 ~ 4 joint-cuttings along filter core element circumference, check in earnest comprehensively, cutting filter core sample or collection fouling products carry out chemical analysis;

(5) Chemical cleaning test: at first, the filter core that lost efficacy is put into cleaning case, inject demineralized water, the hydro-oxidation sodium solution soaked 24 hours, during the filter core that will regularly overturn, clean filter core with demineralized water then, soaked one hour with 1% clorox again after the cleaning, clean up (paying special attention to the flushing of filter core water producing pipe), In Shade drying with demineralized water at last, filter core after cleaning is installed in security personnel's filter, adds non-oxidizable bactericide 2000mL again and soak;

(6) restorability test: the filter core element is carried out Chemical cleaning recover test, with definite type of polluting and the restorability of filter core element.

If cleaning performance is undesirable, adopt different cleaning programs to test with continuing, to determine optimum cleaning program, all will carry out performance test to the filter core element after each cleaning finishes, the recovery effects with the assessment Chemical cleaning adopts optimum cleaning program to clean, make it reach designing requirement, to reuse, cost saving reduces the pollution to environment.

Filter core provided by the invention cleans reuse method, and filter core is reused, saved the expense of changing a large amount of filter cores, and has reduced filter core and scrapped pollution to environment in a large number.

The specific embodiment

Embodiment 1:

Taiyuan Iron and Steel Co. energy source and power head factory chemical films is handled workshop first-stage reverse osmosis security personnel filter element cleaning reuse and is taked following steps:

(1) physical appearance of filter core element detects:

Open security personnel's filter (filter core is connected with security personnel's filter bottom, is shaped as tubulose), take off filter core, estimating its surface has yellow thick attachment, for the dirt of organic matter and microorganism is blocked up.

(2) performance test:

According to log, under the status of criterion, the performance parameter of the filter core element after dirt is stifled and the performance parameter when putting into operation beginning are made comparisons:

(3) analytical test:

Combustible loss method (LOI): get two part of 5.0000 gram pollutant the residual contaminants from filter core and place in two crucibles and carry out parallel test, carry out constant temperature baking two hours in the drying box under 110 oC, take out, when specimen temperature reaches room temperature, put it in the drier and take out after half an hour, weigh at assay balance, the 1# sample weighs 3.8890 grams, the 2# sample weighs 3.9023 grams, continue to put into drying box constant temperature and toast half an hour, weigh after the taking-up, the 1# sample weighs 3.8869 grams, and the 2# sample weighs 3.8978 grams; Use the same method and toast repeatedly, up to constant weight, the 1# sample weighs 3.8857 grams, and the 2# sample weighs 3.8859 grams; Sample with constant weight after the drying, putting into temperature is heated to the 550oC high temperature furnace and carries out constant temperature and handle (to destroy the organic matter of pollutant, make organic matter degradation or volatilization in the pollutant), take out after seven minutes, when specimen temperature reaches room temperature, it is put into drier takes out half an hour, weigh at assay balance, the 1# sample weighs 0.9825 gram, and the 2# sample weighs 0.9826 gram, continues to put into high temperature furnace constant temperature baking seven minutes, taking-up is weighed, the 1# sample weighs 0.9823 gram, and the 2# sample weighs 0.9825 gram, really with constant weight.

Through the parallel analysis test, dry matter content is 13.65%.Generally, dry matter content shows usually that less than 20% o'clock major part is biological pollution in the organic contamination.

(4) dissection and analysis:

A, sampling: with cut-off knife filter core is axially evenly cut 4 joint-cuttings along the element circumference, check its inner dirty stifled situation comprehensively in earnest, find that also there is dirty stifled thing filter core inside, radial measurement reaches 6mm; Cutting filter core sample is collected into fouling products in the small beaker with pocket knife, carries out chemical analysis;

B, with the fouling products calcination, smell the hairiness fever smell of burning, determine that tentatively fouling products is mainly organic matter and microorganism;

C, dispose pH=10, pH=11, pH=12 respectively each two parts of sodium hydroxide solutions in 6 beakers, with the stifled filter core sample of the dirt of cutting be put in respectively for 6 parts soak 24 hours in 6 beakers after, find that dirty stifled thing obviously reduces;

D, configuration concentration is that each two parts of 0.5%, 1%, 3% liquor natrii hypochloritises are in 6 beakers respectively, the stifled filter core sample of the dirt of cutting is put in respectively in 6 beakers for 6 parts, and stirs with glass bar, observe its dissolving situation, among the liquor natrii hypochloritis of discovery 1%, fouling products disperses rapidly, dissolves;

E, carry out two steps of above-mentioned c, d successively, the stifled filter core sample of dirt is soaked in sodium hydroxide solution soaked 1 hour with 1% liquor natrii hypochloritis after 24 hours again, weigh after the drying, discovery weight has obvious minimizing again;

Therefore, this time analytical method is determined to adopt sodium hydroxide solution and liquor natrii hypochloritis that sample is carried out chemical analysis successively.

(5) Chemical cleaning test:

A, the filter core that lost efficacy is put into cleaning case, inject demineralized water 800mL;

B, in the cleaning case hydro-oxidation sodium solution, pH value is transferred to 12, soaked 24 hours.During this time, 1 filter core of upset in 1 hour is chemically examined pH value at interval, if pH value reduces, in time the hydro-oxidation sodium solution is regulated, and guarantees that cleaning case solution remains PH=12;

C, the solution in the cleaning case is drained, cleans filter core five times with demineralized water, after the cleaning again the liquor natrii hypochloritis with 1% soaked 1 hour;

D, the solution in the cleaning case is drained, clean filter core twice with demineralized water, then filter core is taken out one one meticulous cleaning from cleaning case, pay special attention to the flushing of filter core water producing pipe, be weighed as 635 grams (weight of new filter core is 629 grams) after the In Shade drying; Error is 1%, (coincidence loss scope＜5 %).

(6) restorability test:

Filter core after cleaning is installed in security personnel's filter, adds non-oxidizable bactericide 2000mL immersion again and put into operation after 2 hours, observe its operational factor, the gained data are as follows:

The proof that puts into operation, the filter core after the cleaning can reach designing requirement fully.

Taiyuan Iron and Steel Co. energy source and power head factory 2 * 300MW unit boiler make-up water is handled the workshop and is used 5 μ m filter cores of a large amount of PP materials to do security personnel's filter core of counter-infiltration and CEDI.After putting into operation 8 months, security personnel's filter filtered water rate reduces gradually, and pressure reduction is big, and filter core is dirty stifled, should more renew filter core, and test by analysis utilizes after the filter core that decision will be changed cleans again.Reinstall the proof that puts into operation, can reach designing requirement fully, one time one can economize on the use of funds 70 * 35 yuan=2450 yuan, 12 counter-infiltrations security personnel filters can be saved 29400 yuan in 1 year, simultaneously, had reduced and had scrapped filter core in a large number to the pollution of environment.

Claims (1)

1. a filter core cleans reuse method, it is characterized in that comprising the steps:

(1) physical appearance of filter core element detects: the filter core element is estimated and weighed;

(2) performance test: detect the filter core element and under the code test situation, produce discharge and pressure reduction, and contrast with standard filter cartridges element function parameter, or compare with the original performance parameter of dispatching from the factory;

(3) analytical test: combustible loss method, it is a kind of gravimetric analysis method, pollutant residual on the filter core is being heated to 550oC after the drying under 110 oC, and to destroy the organic matter in the pollutant, high temperature makes organic matter degradation or the volatilization in the pollutant, pollutant weight before and after the weighing heating, with definite organic contamination percentage, and determine whether it is biological pollution, generally, dry matter content shows usually that less than 20% o'clock major part is biological pollution in the organic contamination;

(4) dissection and analysis: axially evenly cut 2 ~ 4 joint-cuttings along filter core element circumference, check in earnest comprehensively, cutting filter core sample or collection fouling products carry out chemical analysis;

(5) Chemical cleaning test: at first, the filter core that lost efficacy is put into cleaning case, inject demineralized water, the hydro-oxidation sodium solution soaked 24 hours, during the filter core that will regularly overturn, clean filter core with demineralized water then, soaked one hour with 1% clorox again after the cleaning, clean up In Shade drying at last with demineralized water, filter core after cleaning is installed in security personnel's filter, adds non-oxidizable bactericide 2000mL again and soak;

(6) restorability test: the filter core element is carried out Chemical cleaning recover test, with definite type of polluting and the restorability of filter core element.