How to deal with used filter elements

Abstract

The invention discloses a method for treating a waste filter core, which comprises the following steps: coring, breaking the filter core to separate a filter medium and a gel shell skeleton; pickling, preparing a hydrochloric acid solution, putting a filter medium to be treated into the solution for soaking after the preparation is completed, placing the filter medium under a stirrer and heating it after soaking for a certain period of time, heating it to a predetermined temperature, stirring it continuously for a certain period of time and then stopping stirring; cleaning, rinsing with clean water, placing the filter medium in water after rinsing, adding a cleaning agent into the water and continuing heating and stirring, heating it to a predetermined temperature, and stirring it continuously for a certain period of time; bleaching, rinsing the filter medium in the cleaning process with clean water after stirring is completed, preparing a hydrogen peroxide solution, and immersing the filter medium rinsed in the bleaching process in the hydrogen peroxide solution for bleaching treatment for a certain period of time; drying, rinsing the filter medium with clean water and then drying it. The method can effectively treat the waste filter core.

Description

Technical Field

[0001] The invention relates to the technical field of waste treatment, and in particular to a method for treating a waste filter element. Background Art

[0002] The filter element is made of filter media wrapped around a plastic shell frame and is mainly used in the food and beverage industry, electronics industry, petroleum and chemical industry, pharmaceutical industry and other industries. Due to the hazardous waste properties of the filter element after production and use, the disposal of the filter element has become an industry problem.

[0003] At present, the common method of treating waste filter elements is incineration. However, due to the characteristics of their existence, their treatment efficiency is low in the current hazardous waste incineration process, and they produce more pollutants, which is not conducive to environmental protection. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a method for treating waste filter elements, which can treat and recycle the waste filter elements, save costs, reduce pollution, and improve treatment efficiency.

[0005] A method for processing a waste filter element according to a first aspect of an embodiment of the present invention comprises the following steps:

[0006] Remove the core and break the filter element to separate the filter medium and the shell skeleton;

[0007] Acid washing, preparing hydrochloric acid solution, and then putting the filter medium to be treated into it for soaking after the preparation is completed. After soaking for a certain period of time, it is placed under a stirrer and heated to a predetermined temperature, and the stirring is stopped after continuous stirring for a certain period of time;

[0008] Cleaning: Rinse with clean water. After rinsing, place the filter medium in water, add cleaning agent to the water, continue heating and stirring, heat to a predetermined temperature, and continue stirring for a certain period of time;

[0009] Bleaching: After the filter medium being washed is stirred, it is rinsed with clean water. After the rinsing is completed, a hydrogen peroxide solution is prepared, and the filter medium rinsed in the bleaching process is immersed in the hydrogen peroxide solution for bleaching treatment for a certain period of time;

[0010] Let dry, rinse with clean water and let the filter media dry.

[0011] A method for processing waste filter elements according to an embodiment of the present invention has at least the following beneficial effects: it can completely transform the waste filter elements from the previous simple incineration treatment to a treatment method that meets environmental protection requirements, that is, the waste filter elements are disassembled, the filter medium is cleaned and recovered, and the plastic shell skeleton is crushed and recovered, so that the waste filter elements can be recycled as resources, and the generated hazardous waste substances are also greatly reduced, eliminating the complicated steps of purifying the incineration gas, greatly reducing the difficulty and danger of processing the waste filter elements, and the products after the filter element recycling can be resold to obtain income to make up for the cost of processing the waste filter elements, thereby achieving sustainable development.

[0012] According to some embodiments of the present invention, in the pickling step, the pH of the hydrochloric acid solution is 3, the soaking time is 30 minutes, the heating temperature is 80° C., and the stirring time is 2 hours.

[0013] According to some embodiments of the present invention, in the cleaning step, when the cleaning agent is added to the water, the volume ratio of water to the cleaning agent is 99:1, the heating temperature is 60° C., and the stirring time is 2 hours.

[0014] According to some embodiments of the present invention, in the bleaching step, the volume of the hydrogen peroxide solution is 99% water and the volume of hydrogen peroxide is 1%, and hydrochloric acid is added to the hydrogen peroxide solution to adjust the pH to 4.

[0015] According to some embodiments of the present invention, in the bleaching step, the bleaching treatment time is 2 hours.

[0016] According to some embodiments of the present invention, when treating the carbon fiber filter medium, a cleaning step is adopted but no cleaning agent is added, and the medium is rinsed with clean water after cleaning. After cleaning, waste water in the carbon fiber filter medium is separated by suction filtration.

[0017] According to some embodiments of the present invention, wastewater from cleaning the carbon fiber filter medium is collected, and the collected wastewater contains copper sulfate. After the copper sulfate is extracted and precipitated with alkaline solution, dilute sulfuric acid is added to obtain copper sulfate, thereby achieving the collection of copper sulfate.

[0018] According to some embodiments of the present invention, when processing a darker-colored cotton filter medium, the cotton filter medium needs to be scrubbed after the acid washing step and after the cleaning step.

[0019] According to some embodiments of the present invention, the clean water used in the washing step, the bleaching step and the drying step is recycled to the previous step after being purified, and the clean water used in the drying step can also be used in the pickling step or in the rinsing process after the pickling step after purification.

[0020] According to some embodiments of the present invention, the gelatin shell skeleton removed in the coring step is crushed and then collected.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 This is a process flow chart of a method for treating a waste filter element according to an embodiment of the present invention; DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0025] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] In the description of the present invention, "several" means one or more, "more" means two or more, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0027] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0028] Reference Figure 1 A method for treating a waste filter element comprises the following steps:

[0029] Remove the core and break the filter element to separate the filter medium and the shell skeleton;

[0030] Acid washing, preparing hydrochloric acid solution, and then putting the filter medium to be treated into it for soaking after the preparation is completed. After soaking for a certain period of time, it is placed under a stirrer and heated to a predetermined temperature, and the stirring is stopped after continuous stirring for a certain period of time;

[0031] Cleaning: Rinse with clean water. After rinsing, place the filter medium in water, add cleaning agent to the water, continue heating and stirring, heat to a predetermined temperature, and continue stirring for a certain period of time;

[0032] Bleaching: After the filter medium being washed is stirred, it is rinsed with clean water. After the rinsing is completed, a hydrogen peroxide solution is prepared, and the filter medium rinsed in the bleaching process is immersed in the hydrogen peroxide solution for bleaching treatment for a certain period of time;

[0033] Let dry, rinse with clean water and let the filter media dry.

[0034] This method can completely transform the waste filter elements from the previous simple incineration treatment to a treatment method that meets environmental protection requirements, that is, the waste filter elements are disassembled, the filter medium is cleaned and recovered, and the plastic shell skeleton is crushed and recovered, so that the waste filter elements can be recycled as resources, and the generation of hazardous waste substances is also greatly reduced, eliminating the complicated steps of purifying incineration gases, greatly reducing the difficulty and danger of treating the waste filter elements, and the products after the filter element recycling can be resold to obtain income to make up for the cost of treating the waste filter elements, thereby achieving sustainable development.

[0035] In some embodiments, in the pickling step, the pH of the hydrochloric acid solution is 3, the soaking time is 30 minutes, the heating temperature is 80°C, and the stirring time is 2 hours. It is understandable that when preparing the hydrochloric acid solution, five hydrochloric acid solutions with pH values ​​of 1 to 5 are prepared, and each hydrochloric acid solution has a total of one liter, which is placed in a beaker, and then an equal amount of the same filter medium is added to each beaker. The filter medium can be made of cotton or PP material, and then heated to 80°C and stirred for the same time to observe the pickling effect. The experimental results show that when the pH is 3, the pickling effect is best. In addition, the stirring time is 2 hours because after the hydrochloric acid solution with a pH of 3 is determined, a total of five portions of hydrochloric acid solution with a pH of 3 are prepared, each totaling 1 L, and placed in a beaker for standby use. Then, an equal amount of the same filter medium is added to each beaker. The filter medium can be made of cotton or PP material, and then heated to 80°C. The stirring times are 0.5 hour, 1 hour, 1.5 hours, 2 hours and 2.5 hours, respectively. Experiments show that when the stirring time is 2 hours and 2.5 hours, the effect of cleaning the cotton core meets the requirements. After comprehensive consideration, 2 hours is used in the pickling, cleaning and bleaching processes.

[0036] In some embodiments, in the cleaning step, when the cleaning agent is added to the water, the volume ratio of water to the cleaning agent is 99:1, the heating temperature is 60°C, and the stirring time is 2 hours. It can be understood that the volume ratio refers to the mixture of the cleaning agent and water, in which the volume of water accounts for 99 parts and the volume of the cleaning agent accounts for 1 part. For example, in one liter of the mixture, water accounts for 0.99 liters and the cleaning agent accounts for 0.01 liters.

[0037] In some embodiments, in the bleaching step, a hydrogen peroxide solution is prepared, wherein water accounts for 99% by volume and hydrogen peroxide accounts for 1% by volume, and hydrochloric acid is added to the hydrogen peroxide solution to adjust the pH to 4. It is understood that the addition of hydrochloric acid to the hydrogen peroxide solution can enhance the bleaching function of the hydrogen peroxide solution.

[0038] In some embodiments, in the bleaching step, the bleaching treatment time is 2 hours.

[0039] In some embodiments, when treating the carbon fiber filter medium, a cleaning step is used but no cleaning agent is added, and the medium is rinsed with clean water after cleaning, and the waste water in the carbon fiber filter medium is separated by suction filtration after cleaning. It is understandable that when treating the carbon fiber filter medium, the carbon fiber filter medium needs to be placed in clean water and heated and stirred, and after repeating this for more than four times, the carbon fiber filter medium is rinsed, and finally the carbon fiber filter medium is suction filtered.

[0040] In some embodiments, wastewater from cleaning the carbon fiber filter medium is collected, and the collected wastewater contains copper sulfate. After the copper sulfate is extracted and precipitated with alkali solution, dilute sulfuric acid is added to obtain copper sulfate to achieve the collection of copper sulfate. It can be understood that the added alkali solution is sodium hydroxide solution.

[0041] In some embodiments, when processing darker colored cotton filter media, the cotton filter media needs to be scrubbed after both the acid washing step and the cleaning step. The scrubbing can be performed by a machine or by a manually operated scrubbing tool such as a scrubbing board.

[0042] In some embodiments, the clean water used in the washing step, the bleaching step and the drying step is purified and then recycled to the previous step. The clean water used in the drying step can also be used in the pickling step or the rinsing process after the pickling step after purification. It can be understood that because the clean water used for rinsing is not highly contaminated, it is relatively easy to purify and can be recycled after purification to save water resources.

[0043] In some embodiments, the plastic shell skeleton taken out in the coring step is collected after being crushed. It can be understood that the plastic shell skeleton itself is recyclable. After being crushed into pieces, it can be sold to a plastic factory for melt injection molding again to achieve waste recycling.

[0044] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A method for treating waste filter elements, It is characterized in that The following steps are involved: Remove the core and break the filter element to separate the filter medium and the shell skeleton; Acid washing, preparing hydrochloric acid solution, and then putting the filter medium to be treated into it for soaking after the preparation is completed. After soaking for a certain period of time, it is placed under a stirrer and heated to a predetermined temperature, and the stirring is stopped after continuous stirring for a certain period of time; Cleaning: Rinse with clean water. After rinsing, place the filter medium in water, add cleaning agent to the water, continue heating and stirring, heat to a predetermined temperature, and continue stirring for a certain period of time; Bleaching: After the filter medium being washed is stirred, it is rinsed with clean water. After the rinsing is completed, a hydrogen peroxide solution is prepared, and the filter medium rinsed in the bleaching process is immersed in the hydrogen peroxide solution for bleaching treatment for a certain period of time; Dry, rinse with clean water and dry the filter media; When treating the carbon fiber filter medium, a cleaning step is adopted but no cleaning agent is added, and the medium is rinsed with clean water after cleaning. After cleaning, wastewater in the carbon fiber filter medium is separated by suction filtration, and the wastewater after cleaning the carbon fiber filter medium is collected. The collected wastewater contains copper sulfate, and the copper sulfate is extracted and precipitated by adding alkali solution, and then dilute sulfuric acid is added to obtain copper sulfate, so as to realize the collection of copper sulfate; When processing a darker-colored cotton filter medium, the cotton filter medium needs to be scrubbed after the acid washing step and after the cleaning step; The clean water used in the washing step, the bleaching step and the drying step is recycled to the previous step after being purified, and the clean water used in the drying step can also be used in the pickling step or in the rinsing process after the pickling step after being purified; The gelatin shell skeleton taken out in the coring step is crushed and then collected.

2. The method for treating a waste filter element according to claim 1, Features: In the pickling step, the pH of the hydrochloric acid solution is 3, the immersion time is 30 minutes, the heating temperature is 80° C., and the stirring time is 2 hours.

3. The method for treating a waste filter element according to claim 1, Features: In the cleaning step, when the cleaning agent is added to the water, the volume ratio of water to the cleaning agent is 99:1, the heating temperature is 60° C., and the stirring time is 2 hours.

4. The method for treating a waste filter element according to claim 1, Features: In the bleaching step, the volume of the hydrogen peroxide solution is 99% water and 1% hydrogen peroxide, and hydrochloric acid is added to the hydrogen peroxide solution to adjust the pH to 4.

5. The method for treating a waste filter element according to claim 1, Features: In the bleaching step, the bleaching treatment time is 2 hours.

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