Mine water pretreatment device

Abstract

The utility model provides a mine water pretreatment device, which comprises a multi-medium filter, a first security filter, an ultrafiltration device and a second security filter, the multi-medium filter is sequentially communicated with the first security filter, the ultrafiltration device and the second security filter and is used for pretreating mine water. According to the pretreatment device, the mine water is treated through the multi-medium filter and the ultrafiltration device, some impurities in the mine water are effectively removed before entering the reverse osmosis membrane group, the water quality of the mine water is purified, the treatment burden of the reverse osmosis membrane group is relieved, and the service life of the reverse osmosis membrane group is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a mine water pretreatment device. Background Art

[0002] The annual municipal water consumption of Selian No. 2 Mine is far beyond the approved local tap water consumption of 161,500 cubic meters. In October 2019, our mine built a 2*20t deep mine water treatment system. In 2020, the annual municipal water consumption was reduced to 160,000 cubic meters, and the tap water consumption was controlled within the approved water consumption range.

[0003] However, the pretreatment link of the existing mine water deep treatment system is relatively simple, and only uses a security filter. The water quality of the filtered mine water is poor, and the suspended matter, organic matter, colloids, etc. in the mine water cannot be removed. Only the reverse osmosis membrane group in the mine water deep treatment system is used to treat the mine water, which increases the processing burden of the reverse osmosis membrane group, easily pollutes and blocks the reverse osmosis membrane group, and shortens the service life of the reverse osmosis membrane group. Utility Model Content

[0004] The technical problem to be solved by the utility model is how to pre-treat mine water and increase the service life of the reverse osmosis membrane group.

[0005] The utility model solves the above technical problems through the following technical means:

[0006] The utility model provides a mine water pretreatment device, which comprises a multi-media filter, a post-filtration water tank, a first safety filter, an ultrafiltration device, an ultrafiltration water tank and a second safety filter. The mine water is sequentially connected to the multi-media filter, the post-filtration water tank, the first safety filter, the ultrafiltration device, the ultrafiltration water tank and the second safety filter for pretreatment.

[0007] Beneficial effects: The pretreatment device of the present application treats mine water through a multi-media filter and an ultrafiltration device. Some impurities in the mine water are effectively removed before entering the reverse osmosis membrane group, thereby purifying the water quality of the mine water, reducing the processing burden of the reverse osmosis membrane group, and increasing the service life of the reverse osmosis membrane group.

[0008] Preferably, it also includes a compressor, which performs air washing on the multi-media filter and the ultrafiltration device by passing compressed air into the multi-media filter and the ultrafiltration device.

[0009] Preferably, part of the water in the post-filtration water tank flows into the multi-media filter to backwash the multi-media filter.

[0010] Preferably, a cleaning feeder is also included to add a bactericide to the water used for backwashing the ultrafiltration water tank for sterilization.

[0011] Preferably, the cleaning feeder first adds an alkali agent and then an acid agent to the backwash water to chemically clean the ultrafiltration device.

[0012] Preferably, it also includes a water feeder to add a reducing agent and a scale inhibitor to the water flowing from the ultrafiltration water tank into the second security filter.

[0013] Preferably, the ultrafiltration device uses a hollow fiber ultrafiltration membrane.

[0014] Preferably, the pore size of the hollow fiber ultrafiltration membrane is 0.03-0.2 um.

[0015] Preferably, the multi-media filter is a fully automatic multi-media filter.

[0016] Preferably, the fully automatic multi-media filter comprises a quartz sand / anthracite multi-media filter.

[0017] The advantages of the utility model are:

[0018] 1. The pretreatment device of the present application treats mine water through a multi-media filter and an ultrafiltration device, so that larger suspended solids, organic matter, colloids and macromolecular solutes in the mine water are effectively removed before entering the reverse osmosis membrane group, purifying the water quality of the mine inlet water, reducing the processing burden of the reverse osmosis membrane group, and increasing the service life of the reverse osmosis membrane group.

[0019] 2. The present application uses a compressor and a cleaning feeder to perform air washing and chemical cleaning on the ultrafiltration device to clean impurities on the hollow fiber ultrafiltration membrane, which can extend the service life of the hollow fiber ultrafiltration membrane.

[0020] 3. The present application uses a multi-media filter to utilize its multiple filtering interfaces, each interface has filter materials with different particle sizes to adsorb and filter the mine water, reducing the penetration rate of suspended matter in the mine water. Compared with other types of filters, the multi-media filter has a greater pollution interception capacity. The multi-media filter effectively removes large suspended matter, solid particles and suspended solids in the mine water. Suspended solids are non-colloidal solid substances that are insoluble in water and can be precipitated when conditions are suitable. This reduces the SDI value of the water and meets the requirements for purified water quality.

[0021] 4. This application uses an ultrafiltration device to remove large molecular impurities in mine water after passing through a multi-media filter. The large molecular impurities are blocked by the hollow fiber ultrafiltration membrane wall and flow out of the ultrafiltration device with the concentrated water. The hollow fiber ultrafiltration membrane is not easily clogged and can be used continuously for a long time. The filtration process can be operated at room temperature and low pressure without phase changes, and is highly efficient and energy-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a flow chart of a mine water pretreatment device in an embodiment. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present utility model, it should be noted that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, an indirect connection through an intermediate medium, or a connection between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0025] In the early stage of this application, we held exchanges and discussions with relevant manufacturers to understand the most advanced and applicable mine water deep treatment systems and to solve the shortcomings of the existing mine water deep treatment systems. The existing pretreatment process is relatively simple, and only uses a security filter. The water quality of the treated mine water is poor. The reverse osmosis membrane group filters the mine water for a long time, which easily pollutes and clogs the membrane group and shortens the life of the reverse osmosis membrane group. Finally, the mine water pretreatment device of the embodiment was determined.

[0026] Example 1

[0027] This embodiment provides a mine water pretreatment device, which includes a multi-media filter, a post-filtration water tank, a first safety filter, an ultrafiltration device, an ultrafiltration water tank, and a second safety filter. The mine water is connected to the multi-media filter, the post-filtration water tank, the first safety filter, the ultrafiltration device, the ultrafiltration water tank, and the second safety filter in sequence for pretreatment.

[0028] The multi-media filter is a fully automatic multi-media filter, which can be purchased directly from the market. The fully automatic multi-media filter can meet the water treatment requirements of mine water. The fully automatic multi-media filter of this embodiment is a quartz sand / anthracite multi-media filter, which has two filter materials, quartz sand and anthracite. The two filter materials are arranged in a cross-layered manner in the filter tank body, and the particle sizes of the two filter materials gradually decrease from top to bottom in the filter tank body. For example, a layer of quartz sand, a layer of anthracite, another layer of quartz sand, and another layer of anthracite are arranged from top to bottom in the filter tank body, and the cross-distribution is such that the particle sizes of quartz sand and anthracite gradually decrease from top to bottom. Such a ratio ensures that the filter will not produce a disordered layer phenomenon when backwashing, thereby ensuring the interception capacity of the filter material.

[0029] Therefore, the quartz sand / anthracite filter has multiple filtering interfaces, and each interface has filter materials with different particle sizes to adsorb and filter the mine water, reducing the penetration rate of suspended matter in the mine water. Compared with other types of filters, it has a greater pollution interception capacity. The multi-media filter effectively removes large suspended matter, solid particles and suspended solids in the mine water. Suspended solids are non-colloidal solid substances that are insoluble in water and can be precipitated when conditions are suitable. Thereby reducing the SDI value of water and meeting the requirements of purified water quality.

[0030] Mine water enters the post-filtration water tank through the quartz sand / anthracite multi-media filter. A portion of the water in the post-filtration water tank enters the first security filter through the water pump to further filter out fine particles in the water, and then enters the ultrafiltration device for treatment. Another portion of the water in the post-filtration water tank flows into the multi-media filter to backwash the multi-media filter. After backwashing, the filter material can be used multiple times, extending the service life of the filter material.

[0031] After the quartz sand / anthracite multi-media filter is backwashed, compressed air is introduced into the quartz sand / anthracite multi-media filter for air washing, the purpose of which is to peel off the dirt attached to the filter material and enhance the backwashing effect.

[0032] The ultrafiltration device can be purchased directly from the market, and any device that meets the requirements for mine water treatment is sufficient. The ultrafiltration device used in this embodiment is UFOA2880, and the filter membrane is a hollow fiber ultrafiltration membrane with a pore size of 0.05 um. The hollow fiber ultrafiltration membrane is made of polyvinylidene fluoride.

[0033] The hollow fiber ultrafiltration membrane wall is densely covered with micropores. Mine water passes through one side of the membrane under a certain pressure. Water and small molecules are filtered out through the membrane wall, while larger molecular impurities are retained by the membrane, thereby achieving the purpose of separating impurities from mine water. The separation process is a dynamic filtration process. Large molecular impurities are blocked by the membrane wall and flow out of the membrane assembly with the concentrated water. The membrane is not easily blocked and can be used continuously for a long time. The filtration process can be operated at room temperature and low pressure, without phase change, and is highly efficient and energy-saving.

[0034] The purpose of selecting hollow fiber ultrafiltration membrane for ultrafiltration device in this application is that polyvinylidene fluoride material has strong chemical stability, can withstand cleaning with bactericides and acids and alkalis, and effectively prevents the reproduction of bacteria and other microorganisms; this embodiment uses a smaller membrane pore size, which can remove most of the suspended particles, microorganisms, colloids, pathogens and bacteria.

[0035] After passing through the ultrafiltration device, the mine water enters the ultrafiltration water tank. Part of the water enters the second security filter for filtration, and finally enters the reverse osmosis membrane group through a high-pressure pump. Another part of the water flows into the ultrafiltration device to clean the ultrafiltration device.

[0036] For cleaning of the ultrafiltration device, firstly, introduce compressed air for air washing, and the air washing time is 30-180s; then backwashing and sterilization are carried out, and the bactericide is generally selected as sodium hypochlorite, and the amount of bactericide is adjusted according to the water quality; finally, chemical cleaning is carried out, and chemical cleaning is first cleaned with an alkali agent, and then cleaned with an acid agent. The alkali agent is generally selected as a 0.1% NaOH+0.2% NaClO mixed solution, and the acid agent is generally selected as a 1-2% citric acid solution or a 0.4% HCI solution, and the chemical cleaning time is 60-90min. The bactericide, alkali agent and acid agent are not limited to the above solutions, and other suitable solutions can be selected according to the water quality.

[0037] After the mine water passes through the ultrafiltration device, most of the suspended particles, microorganisms, colloids, pathogens and bacteria in the mine water are removed, improving the water quality of the mine water. Then the water enters the reverse osmosis membrane group, reducing the filtration burden of the reverse osmosis membrane group and increasing the service life of the reverse osmosis membrane group.

[0038] Before the mine water enters the reverse osmosis membrane group, adding antiscalant to the water is to further reduce the scaling of impurities in the mine water on the reverse osmosis membrane, prevent water flow blockage, and increase the water output of the reverse osmosis membrane group. Before the mine water enters the reverse osmosis membrane group, adding reducing agent to the water eliminates the residual chlorine in the water entering the reverse osmosis membrane group and prevents the damage of the reverse osmosis membrane group caused by the oxidant. The reducing agent is generally selected as sodium sulfite solution, and other reducing agents can be selected according to the water quality.

[0039] Example 2

[0040] This embodiment provides a mine water pretreatment device. The difference between this embodiment and Embodiment 2 is that the membrane pore size of the hollow fiber ultrafiltration membrane is 0.2 um.

[0041] Example 3

[0042] This embodiment provides a mine water pretreatment device. The difference between this embodiment and Embodiment 2 is that the membrane pore size of the hollow fiber ultrafiltration membrane is 0.03 um.

[0043] The pretreatment device of this application has been built and put into operation. The water quality meets the requirements of the "Sanitary Standard for Drinking Water" (GB5749-2006) for drinking water quality. The average daily water output is 500m 3 In winter, when water consumption is high, the mine’s daily tap water consumption is effectively controlled at 100m 3 The application of deep treatment and reuse of mine water reduces the amount of municipal tap water used in the mine, reduces the amount of water discharged from the mine, and alleviates the environmental pressure of the mine to a certain extent.

[0044] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A mine water pretreatment device, characterized in that: The pretreatment device includes a multi-media filter, a post-filtration water tank, a first safety filter, an ultrafiltration device, an ultrafiltration water tank and a second safety filter. The mine water is connected to the multi-media filter, the post-filtration water tank, the first safety filter, the ultrafiltration device, the ultrafiltration water tank and the second safety filter in sequence for pretreatment.

2. The mine water pretreatment device according to claim 1, characterized in that: The invention also comprises a compressor, which passes compressed air into the multi-media filter and the ultrafiltration device to perform air washing on the multi-media filter and the ultrafiltration device.

3. The mine water pretreatment device according to claim 2, characterized in that: A portion of the water in the post-filtration water tank flows into the multi-media filter to backwash the multi-media filter.

4. The mine water pretreatment device according to claim 2, characterized in that: It also comprises a cleaning feeder, which adds a bactericide to the water used for backwashing the ultrafiltration water tank for sterilization.

5. The mine water pretreatment device according to claim 4, characterized in that: The cleaning feeder first adds an alkali agent and then an acid agent to the backwashing water to chemically clean the ultrafiltration device.

6. The mine water pretreatment device according to claim 1, characterized in that: It also includes a water feeder for adding a reducing agent and a scale inhibitor into the water flowing from the ultrafiltration water tank into the second security filter.

7. The mine water pretreatment device according to claim 1, characterized in that: The ultrafiltration device uses a hollow fiber ultrafiltration membrane.

8. The mine water pretreatment device according to claim 7, characterized in that: The membrane pore size of the hollow fiber ultrafiltration membrane is 0.03-0.2um.

9. The mine water pretreatment device according to claim 1, characterized in that: The multi-media filter is a fully automatic multi-media filter.

10. The mine water pretreatment device according to claim 9, characterized in that: The fully automatic multi-media filter comprises a quartz sand / anthracite multi-media filter.

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