Mine water underground treatment system

Abstract

The utility model discloses a mine water underground treatment system which comprises a water collecting bin, a water collecting bin, a water collecting bin, a water collecting bin and a water collecting bin, and the water collecting bin is used for collecting to-be-treated mine water underground; an inlet of the separation membrane device is connected with an outlet of the water collecting bin, and the separation membrane device is used for carrying out oil removal and turbidity removal treatment on the mine water in the water collecting bin; an inlet of the product water bin is connected with an outlet of the separation membrane device, the product water bin is used for storing product water obtained after treatment, and a backwashing pump is installed between an outlet of the product water bin and the separation membrane device and used for backwashing treatment of the separation membrane device; the separation membrane device comprises a pressure container and a filtering membrane structure installed in the pressure container, and the filtering membrane structure is a PolyCra series H-UF-40-8040 type membrane element. In the process of treating the mine water, chemicals do not need to be added, new pollution is not generated, oil removal and suspended solid treatment can be carried out at the same time, in-situ treatment and reuse of the mine water can be achieved in one step, and waste of energy and resources is greatly reduced.

Description

TECHNICAL FIELD

[0001] The application relates to an underground mine water treatment system and belongs to the technical field of mine water treatment. BACKGROUND

[0002] In the process of mine exploitation, a series of measures need to be taken to effectively manage and control the water in the underground aquifer. Mine exploitation is often accompanied by changes in the hydrogeological conditions underground, and if not properly handled, it may lead to water disasters, flooded mines, affect the efficiency of coal mining, and even threaten the personal safety of miners. For example, the patent for invention with the publication number CN103332803A discloses a mine water underground treatment and reuse device and method, which specifically comprises a secondary filtration mechanism, a COD detection mechanism, a dosing flocculation mechanism, a secondary filtration mechanism and a water supply mechanism, which reduces the cost of underground operation, saves resources, and is efficient and safe; it can be applied to coal mine water treatment with goaf, especially to the treatment of high-mineralized mine water and high-suspended solid mine water. However, when treating the suspended solids in mine water, flocculants and other reagents need to be added, and at the same time, corresponding sludge disposal facilities need to be matched, which will cause new pollution to the treated mine water and the surrounding environment. CONTENT OF THE UTILITY MODEL

[0003] According to one aspect of the application, a mine water underground treatment system is provided, which does not need to add reagents during the treatment of mine water, does not produce new pollution, and can simultaneously remove oil and suspended solids, achieving in-situ treatment and reuse of mine water in one step, greatly reducing energy and resource waste.

[0004] An underground mine water treatment system, characterized in that it comprises:

[0005] A water collecting bin for collecting mine water to be treated underground;

[0006] A separation membrane device, the inlet of which is connected to the outlet of the water collecting bin through a pipeline, for removing oil and turbidity from the mine water in the water collecting bin;

[0007] A product water bin, the inlet of which is connected to the outlet of the separation membrane device through a pipeline, for storing the product water obtained after treatment, and the outlet of the product water bin is connected to the backwashing port of the separation membrane device through a backwashing water pipe, and a backwashing pump is installed on the backwashing water pipe for backwashing treatment of the separation membrane device;

[0008] The separation membrane device comprises a pressure vessel, and a filter membrane structure is installed inside the pressure vessel, and the filter membrane structure is a PolyCera series H-UF-40-8040 type membrane element.

[0009] Further, the treatment system further comprises:

[0010] A backwash water collecting bin, an inlet of which is connected with the separating membrane device, a top of the backwash water collecting bin is provided with a floating oil collecting device, after collecting the floating oil, secondary recycling is carried out, a middle part of the backwash water collecting bin is provided with a clarified liquid reflux device which is connected with the water collecting bin;

[0011] A dewatering device, an inlet of which is connected with a blowdown port of the backwash water collecting bin, a water outlet of the dewatering device is connected with the water collecting bin.

[0012] Further, the pressure container is a 20-branch 3-core pressure container;

[0013] The filtering membrane structure is a 60-branch membrane element.

[0014] Further, an adjusting valve is installed at an outlet of the water collecting bin, which is used for adjusting the treatment water amount of the mine water.

[0015] Further, the outlet of the product water bin is respectively connected with a downhole reuse pipe and a clean water discharge pipe;

[0016] The downhole reuse pipe is used for the utilization of mine production;

[0017] The clean water discharge pipe is used for discharging the clean water.

[0018] Further, a water outlet of the backwash water collecting bin is connected with the water collecting bin through a supernatant water discharge pipe;

[0019] Further, an outlet of the clarified liquid reflux device is connected with the water collecting bin through the supernatant water discharge pipe;

[0020] The blowdown port of the backwash water collecting bin is connected with the dewatering device through a sludge pipe.

[0021] Further, the treatment system further comprises:

[0022] A controller;

[0023] A power distribution module, which provides safe and reliable power supply for the whole system, ensures that all operation and maintenance activities can be safely and conveniently carried out;

[0024] A water quality monitoring module, which is connected with the controller, the water collecting bin, the separating membrane device and the product water bin, and is used for monitoring the pH value and turbidity of the mine water in each state;

[0025] Each pipe is provided with an adjusting valve, and each adjusting valve is connected with the control system.

[0026] The application can produce beneficial effects, including:

[0027] This application provides a mine water treatment system with a separation membrane device for removing oil and turbidity from the mine water in the collection tank. The separation membrane device includes a pressure vessel and a filter membrane structure installed inside the pressure vessel. The filter membrane structure is a PolyCera series H-UF-40-8040 membrane element. No chemicals need to be added during the mine water treatment process, and no new pollution is generated. It can simultaneously remove oil and suspended solids, achieving in-situ treatment and reuse of mine water in one step, greatly reducing energy and resource waste. Furthermore, this system has strong shock resistance to cope with fluctuations in the quality and quantity of mine water. It also adopts an integrated design, has a small footprint, high treatment rate, and simple equipment maintenance. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a mine water downhole treatment system according to one embodiment of this application;

[0029] Figure 2 This is a top view of a separation membrane device in a mine water downhole treatment system according to one embodiment of this application;

[0030] Figure 3 This is a side view of a separation membrane device in a mine water downhole treatment system according to one embodiment of this application. Figure 1 ;

[0031] Figure 4 This is a side view of a separation membrane device in a mine water downhole treatment system according to one embodiment of this application. Figure 2 ;

[0032] List of components and reference numerals: 1-Water collection tank; 2-Separation membrane device; 3-Product water tank; 4-Backwash pump; 5-Backwash water collection tank; 6-Dewatering device. Detailed Implementation

[0033] The present application is described in detail below with reference to the embodiments, but the present application is not limited to these embodiments.

[0034] See Figure 1 A mine water downhole treatment system, characterized in that it comprises:

[0035] Water collection chamber 1 is used to collect mine water awaiting treatment underground;

[0036] Separation membrane device 2, the inlet of which is connected to the outlet of the water collection tank 1 via a pipeline, is used to remove oil and turbidity from the mine water in the water collection tank 1;

[0037] A product water tank 3, an inlet of which is connected with an outlet of the separation membrane device 2 through a pipeline, is used for storing the product water after treatment, and an outlet of the product water tank 3 is connected with a backwashing port of the separation membrane device 2 through a backwashing water pipeline, a backwashing pump 4 is installed on the backwashing water pipeline, and is used for backwashing treatment of the separation membrane device 2.

[0038] Specifically, when the separation membrane device 2 is in the feeding, some components are accumulated on the membrane surface or embedded in the membrane holes, which causes the increase of the filtration resistance and the decrease of the permeation rate. There are several different forms of fouling, static membrane fouling can occur without the flow of the permeate, which is caused by the adsorption of the components in the feeding on the membrane due to the physical and chemical interactions. On the other hand, dynamic membrane fouling occurs with the flow of the permeate, and the fouling reason can be based on one or more mechanisms. One of them is that the membrane holes are partially or completely blocked due to the accumulation of the fouling medium on the membrane holes. The other is that a cake layer is formed due to the continuous deposition of the particles in the feeding on the membrane surface. Similarly, a gel layer formed on the membrane surface due to the concentration polarization also has a similar fouling effect. Therefore, according to the operation condition, the separation membrane device 2 needs to be backwashed regularly to prevent unnecessary fouling.

[0039] According to the operation condition, the separation membrane device 2 is backwashed regularly, and the product water in the product water tank is transported to the separation membrane device 2 for backwashing operation by the water pump. The backwashing waste water is transported to the backwashing water collection tank 5 for collection by the backwashing waste water pipeline.

[0040] The separation membrane device 2 comprises a pressure container and a filter membrane structure installed in the pressure container, and the filter membrane structure is a PolyCera series H-UF-40-8040 type membrane element.

[0041] The filter membrane breaks the boundary between the traditional organic membrane and the inorganic ceramic membrane, and has the characteristics of oil resistance, high temperature resistance, acid and alkali resistance, high flux, easy recovery after backwashing and the like.

[0042] Specifically, the mine water first enters the water collection tank 1 of the treatment system through the water inlet pipeline, the water collection tank 1 plays a role of storing and adjusting the water quantity, and the mine water stored in the water collection tank 1 enters the separation membrane device 2 for separation treatment under the action of the water pump. The product water after separation is stored in the product water tank 3 through the product water pipeline, and the mine water after separation realizes the in-situ treatment and reuse of the mine water without adding reagents, which does not produce new pollution, and greatly reduces the waste of energy and resources. At the same time, the system has strong impact resistance, so as to cope with the fluctuation of the water quality and quantity of the mine water. In addition, the system has the advantages of small occupation, high treatment rate and simple equipment maintenance.

[0043] The processing system further comprises:

[0044] A backwash water collection bin 5, an inlet of which is connected with the separation membrane device 2, a top of which is provided with a floating oil collection device, and after collecting the floating oil, secondary recycling is carried out, and a middle part of the backwash water collection bin 5 is provided with a clarified liquid reflux device and is connected with the water collecting bin 1.

[0045] The floating oil collection device is a mechanical device specially used for recycling the oil overflowed on the water surface and the oil-water mixture without changing the physical and chemical properties of the oil overflowed on the water surface and the oil-water mixture, and the floating oil collection device can be realized by using the following equipment: the floating oil collection device includes two rollers, an oil collecting groove, a light diaphragm pump, an oil level sensor, a float providing buoyancy, a steel wire hose and the like. The working principle is that the entire floating oil collection device floats on the water surface, the lower edges of the two rollers are submerged below the liquid surface, the water surface floating oil is adhered to the oleophilic surface of the roller through rotation, and then is scraped to the oil collecting groove by the scraper. The oil collecting groove is provided with a backwater hole in communication with an external water pool, and as more and more oil is scraped into the oil collecting groove, the water in the oil collecting groove is gradually squeezed out. When the oil level sensor detects that the oil amount in the oil collecting groove is relatively large, the light diaphragm pump is started to pump the oil liquid to a waste oil tank.

[0046] A dewatering device 6, an inlet of which is connected with a blow-off port of the backwash water collection bin 5, and a drain port of the dewatering device 6 is connected with the water collecting bin 1.

[0047] Specifically, the backwash wastewater generated in the separation membrane device 2 is transported to the backwash water collection bin 5 through a backwash drain pipe for collection. After the concentrated water and the backwash wastewater collected by the backwash water collection bin 5 are left standing, the floating oil at the top is separately collected for secondary utilization; the supernatant at the upper layer is transferred to the water collecting bin 1; and the sediment at the lower layer is transferred to the dewatering device 6.

[0048] After the dewatering device 6 performs dewatering treatment on the sediment, the filter pressing liquid is discharged into the water collecting bin 1 through a filter pressing liquid pipe; and the coal powder is regularly transported out.

[0049] The dewatering device 6 selects a disc filter cloth dewatering mechanism, which includes a main machine and an auxiliary machine. The main machine includes a main shaft, a main shaft transmission device, a slurry tank body, a dewatering filter plate, filter cloth, a filter liquid pipeline, a stirring device, a gas-liquid conversion distribution device, a filter cloth cleaning device, a filter spraying device and a dry oil automatic lubricating device. The auxiliary machine includes a steam-water separation liquid discharge tank, a high-pressure air bag, a water ring vacuum pump and an electric control cabinet.

[0050] In the dehydration process, first through the pipeline sediment continuously input disc type dehydrator tank body; When working, the dehydration plate immersed in the tank under the action of negative pressure of vacuum pump, dehydration plate surface adsorption forming solid particles accumulation layer, liquid through the dehydration plate and filtrate pipeline to distribution head to the drain pipe. Under the action of main shaft reducer, the filter cake adsorbed on the filter fan rotates to the drying zone, and continuous dehydration operation is carried out under the action of vacuum; After drying, the main shaft rotates to the unloading area, and unloading is carried out under the action of blowing or scraper device; The dehydrator disc after unloading enters the belt area again, and the above process is repeated.

[0051] The pressure vessel is a 20-core 3-core pressure vessel;

[0052] The filter membrane structure is 60 membrane elements.

[0053] Specifically, the membrane area of a single element is 24.7m 2 .

[0054] In this application, the nominal flux of water production is considered as 80LMH, so the total membrane area required is: 120m 3 / h*1000Lit / m 3 ÷80Lit / m 2 .h=1500m 2 (Overall membrane area) ÷ 24.7m 2 / membrane element = 60.7 membrane elements. Here, round to 60 membrane elements, which means that the nominal flux designed will be slightly greater than 80LMH (the reverse calculation result is 81LMH). Considering the total number of membrane elements is large, multi-core membrane shells should be used, and may need to be divided into multiple groups for operation. Ultrafiltration usually installed horizontally can be designed as 3-core or 4-core, here 3-core design is adopted, so 60 membrane elements need 20 3-core pressure vessels.

[0055] At the same time, considering the convenience of piping and maintenance, the pressure vessels on the transversely installed membrane rack are designed as 2 columns, and no more than 6 layers of pressure vessels are arranged in each column (too many layers will make the membrane rack too high and the center of gravity unstable). The 20 pressure vessels of the system are divided into 2 membrane groups, each membrane group has 10 membrane shells, which are divided into 2 columns, each column has 5 layers, and the specific separation membrane device structure is as shown in Figures 2-4 .

[0056] Among them, in the backwashing process, the flow of backwashing pump 4 is equal to the total membrane area of a single membrane group multiplied by the set backwashing flux, assuming that the backwashing flow of this system is designed as 120LMH, then: 10 membrane shells * 3 membrane elements per membrane shell * 24.7m 2 / membrane element * 120 Lit / m 2 .h ÷ 1000 Lit / m 3 =89m 3 / h, a pump with a flow rate of 89m3 The backwash pump 4 has a lift of 2-2.5 bar, regardless of the specific pipe pressure loss and elevation loss. Therefore, a conventional vertical or horizontal clean water centrifugal pump is selected.

[0057] The outlet of the product water tank 3 is also connected with a downhole reuse pipe and a clean water outlet pipe, respectively;

[0058] The downhole reuse pipe is used for the utilization of mine production;

[0059] The clean water outlet pipe is used for the clean water outlet.

[0060] The outlet of the clarified liquid reflux device is connected with the water collecting tank 1 through a supernatant drainage pipe;

[0061] The blowdown outlet of the backwash water collecting tank 5 is connected with the dewatering device 6 through a sludge pipe;

[0062] The dewatering device 6 is connected with the water collecting tank 1 through a press filtrate pipe.

[0063] The mine water entering the system forms a certain amount of product water and concentrated water during the water production process, and a certain amount of product water is discharged from the system during backwashing. In addition, the positive flushing during backwashing also causes a part of the raw water to be discharged from the system. Therefore: total water inflow = final net product water total amount + concentrated water generation amount during water production + backwash water discharge amount + positive flushing water discharge amount overall recovery rate = final net product water total amount ÷ total water inflow The definitions of operation recovery rate and total recovery rate are different, and should be calculated according to the following formula: operation recovery rate = instantaneous product water flow rate ÷ (instantaneous product water flow rate + instantaneous concentrated water flow rate).

[0064] The treatment system further comprises:

[0065] a controller;

[0066] a power distribution module, which provides safe and reliable power supply for the entire system, and ensures that all operations and maintenance activities can be safely and conveniently performed;

[0067] a water quality monitoring module, which is connected with the controller, the water collecting tank, the separation membrane device and the product water tank, and is used for monitoring the pH value and turbidity of the mine water in each state;

[0068] Among them, an adjusting valve is arranged on each pipeline of the application, and each adjusting valve is connected with the control system.

[0069] The entire treatment process of the application can be automatically controlled according to the indication of the system, so as to realize automatic operation of the entire process without human intervention.

[0070] It is worth mentioning that the water collecting tank is connected with the special separation device water inlet pump and water inlet regulating valve according to the liquid level, so as to realize the continuous and stable operation of the separation device; meanwhile, the pressure transmitter is arranged in the separation membrane device, so as to realize the automatic switching of operation and backwashing according to the change of operation pressure; the backflow pump of the backwashing water collecting device is connected with the water collecting tank, so as to ensure the continuous and stable operation of the device.

[0071] The overall control part of the system is arranged on the ground, so that the number of downhole workers can be effectively reduced and the working environment can be improved.

[0072] The adjusting valves are all intelligent valves, specifically SRV series intelligent adjusting valves, which have the functions of intelligent measurement of differential pressure, temperature, flow and other pipeline fluid parameters, intelligent control and network communication, can implement the operation state and change trend of the feedback device, and thus effective intelligent monitoring can be realized.

[0073] The indexes of the mine water before treatment in the application are shown in Table 1:

[0074] Serial number Item Unit Design value 1 Temperature ℃ Normal temperature 2 pH 7-8 3 Suspended solids mg / L ≤500 4 Oil mg / L ≤200

[0075] The indexes of the product water obtained after treatment in the application are shown in Table 2: Figure 2

[0076]

[0077]

[0078] Therefore, the oil removal and turbidity removal effects of the mine water treated by the system in the application are remarkable.

[0079] The above is only a few embodiments of the application, and does not limit the application in any form. Although the above preferred embodiments are disclosed, the application is not limited thereto. Any skilled person in the art can make some changes or modifications to the above disclosed technical contents without departing from the scope of the application, and the equivalent embodiments are equivalent to the equivalent embodiments, which are all within the scope of the technical scheme.​

Claims

1. An in-mine water in-mine treatment system, characterized by, The application relates to a mine water treatment system. The mine water treatment system comprises a water collecting bin for collecting mine water to be treated, a separation membrane device connected with the water collecting bin through a pipeline for oil removal and turbidity removal of the mine water in the water collecting bin, and a product water bin connected with the separation membrane device through a pipeline for storing product water after treatment, wherein the product water bin is connected with the separation membrane device through a backwashing water pipeline for backwashing treatment of the separation membrane device. The separation membrane device comprises a pressure container, and a filter membrane structure is arranged in the pressure container. The mine water treatment system further comprises a backwashing water collecting bin connected with the separation membrane device, a floating oil collecting device arranged on the top of the backwashing water collecting bin, a clear liquid backflow device arranged in the middle of the backwashing water collecting bin and connected with the water collecting bin, and a dehydration device connected with a blow-off port of the backwashing water collecting bin. The pressure container is a 20-3-core pressure container.

2. An in-mine water in-mine treatment system as claimed in claim 1 wherein, The filter membrane structure comprises 60 membrane elements. An adjusting valve is arranged at the outlet of the water collecting bin for adjusting the water quantity of the mine water. The outlet of the product water bin is connected with a mine water recycling pipeline and a clean water pipeline.

3. A mine water in-mine treatment system according to claim 1, characterised in that, The mine water recycling pipeline is used for mine production. The clean water pipeline is used for discharging clean water.

4. A mine water in-mine treatment system according to claim 1, characterised in that, The outlet of the clear liquid backflow device is connected with the water collecting bin through a supernatant water pipeline.

5. A mine water in-mine treatment system according to claim 1, characterised in that, The blow-off port of the backwashing water collecting bin is connected with the dehydration device through a sludge pipeline. The mine water treatment system further comprises a controller, a power distribution module, and a water quality monitoring module. The power distribution module provides safe and reliable power supply for the whole system, and ensures that all operation and maintenance activities can be safely and conveniently performed.

6. A mine water in-mine treatment system according to claim 2, characterised in that, The water quality monitoring module is connected with the controller, the water collecting bin, the separation membrane device and the product water bin, and is used for monitoring the pH value and turbidity of the mine water in each state. An adjusting valve is arranged on each pipeline, and each adjusting valve is connected with the controller.

7. A mine water in-mine treatment system according to claim 1, characterised in that, ​ ​ ​ ​ ​

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