Mine water hardness and silicon removal solid-liquid separation treatment system

Abstract

The utility model discloses a solid-liquid separation treatment system for hardness and silicon removal of mine water. The solid-liquid separation treatment system comprises a water inlet tank, a first reaction tank, a second reaction tank, a concentration tank and a tubular membrane filtration device which are sequentially communicated along the treatment direction of the mine water, the first reaction tank is connected with a lime dosing device and a magnesium dosing device, the second reaction tank is connected with an alkali dosing device, aeration devices are arranged at the bottoms of the water inlet tank, the first reaction tank, the second reaction tank and the concentration tank, the aeration devices are connected with an external aeration fan, and mechanical stirrers are arranged in the first reaction tank, the second reaction tank and the concentration tank; a water outlet of the tubular membrane filtration device is connected with a water outlet tank through a water outlet pipe, a pipeline mixer is arranged on the water outlet pipe, and an acid dosing device is connected to the pipeline mixer; and a concentrated water port of the tubular membrane filtering device returns to the concentration tank through a return pipe. The device can simultaneously realize high-efficiency hardness removal, silicon removal and solid-liquid separation of mine water, and has the advantages of good effluent quality, stable operation, small occupied area and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of mine water treatment, in particular to a mine water hardness and silicon removal solid-liquid separation treatment system. Background Art

[0002] Coal mine water refers to all the water that seeps into the underground mining space during the coal mining process. The discharge of mine water is one of the pollution sources with industry characteristics in the coal industry. It is large in quantity and wide in scope. The characteristics of mine water depend on the geological environment of coal formation and the mineral chemical composition of the coal-bearing strata. When mine water flows through the coal mining face and tunnels, due to the influence of human activities, coal rock powder and some organic matter enter the water. Mine water generally contains suspended matter mainly composed of coal rock powder, as well as soluble inorganic salts, less organic pollutants, and generally no toxic substances. Therefore, the purification and utilization of mine water will produce huge economic and social benefits; the treatment method of coal mine water depends on the different water quality.

[0003] At present, with the increasingly stringent environmental protection, the demand for zero emission in the steel, electric power, mining, chemical, printing and dyeing industries is increasing. The high calcium, magnesium and silicon content of RO concentrated water, resin regeneration water, circulating cooling water, etc. restricts the efficiency of subsequent RO reduction. The use of chemical dosing + tubular membrane filtration can replace the "high-density pool + sand filtration + ultrafiltration" in one step, effectively solving the impact of subsequent RO and evaporator scaling. The zero emission process contains biochemical, physicochemical, membrane concentration and salt separation systems and evaporation crystallization systems. The essential pretreatment in the zero emission process is to remove hardness and silicon, so as to ensure the stable operation of the membrane concentration system. Commonly used treatment processes include high-density precipitation method and coagulation precipitation method.

[0004] Coagulation and sedimentation is a water treatment technology that is mainly used to remove hardness components in water, mainly calcium and magnesium ions. This technology adds chemical agents (such as coagulants and flocculants) to the water, causing the calcium and magnesium ions in the water to react with the agents to form water-insoluble precipitates, which are then removed through a process of sedimentation and filtration, thereby achieving the purpose of reducing the hardness of the water. This method can effectively reduce the formation of scale, improve water quality, and make it more suitable for various purposes.

[0005] The technical principle of coagulation sedimentation to remove hardness mainly includes the following steps:

[0006] 1. Coagulation: Adding coagulants (such as aluminum salts or iron salts) to the water can neutralize the electric charge in the water, so that tiny particles and colloids can form larger particles through adsorption, bridging and other effects.

[0007] 2. Flocculation: Add flocculants (such as polyacrylamide, etc.) to help the larger particles to further aggregate and form flocs that are easy to precipitate.

[0008] 3. Sedimentation: Under the action of gravity, the flocs sink to the bottom of the water to form sediment.

[0009] 4. Filtration and Discharge: The sediment is removed by filtering device and the treated water can be used for appropriate purposes.

[0010] The high-efficiency sedimentation tank is a new type of clarification tank after the horizontal flow sedimentation tank, the inclined plate (tube) sedimentation tank and the mechanical acceleration (pulse) clarification tank. It integrates the functions of coagulation, flocculation, sedimentation and sludge concentration. It is divided into a mixing zone, a flocculation zone, a sedimentation zone and a pH adjustment zone. A fast mixer is set in the mixing zone to quickly disperse the added coagulant and lime, fully mix with the raw water and form small flocs. The raw water after pre-coagulation flows to the bottom of the circular guide tube in the reaction tank. The raw water, return sludge and coagulant are mixed evenly from bottom to top by the stirring paddle in the guide tube. The extremely high sludge concentration improves the flocculation effect. After forming a larger floc, it enters the sedimentation zone for rapid sedimentation and concentration. An inclined tube is set in the sedimentation zone. The remaining alum flowers are retained on the inclined tube, combined into large alum flowers and fall to the bottom of the pool to ensure the effluent quality. After the effluent reaches the pH adjustment zone, it enters the next level of treatment device. Part of the concentrated sludge is pumped to the inlet of the reaction tank by the sludge circulation pump in the concentration area, and the other part is discharged as residual sludge to the sludge dewatering room or for other treatment.

[0011] Conventional chemical hardness and silicon removal systems generally have at least one of the following disadvantages:

[0012] 1. It occupies a large area;

[0013] 2. The suspended solids in the effluent are high, and a filtration process needs to be set up before entering the membrane system;

[0014] 3. After running for a period of time, mud is likely to accumulate at the bottom of the pool and the sludge pipe is likely to be blocked. Utility Model Content

[0015] In view of the deficiencies in the prior art, the utility model provides a solid-liquid separation treatment system for removing hardness and silicon from mine water.

[0016] The utility model discloses a solid-liquid separation treatment system for removing hardness and silicon from mine water, comprising: a water inlet pool, a first reaction pool, a second reaction pool, a concentration pool and a tubular membrane filtration device which are sequentially connected and arranged along the treatment direction of the mine water;

[0017] The first reaction tank is connected to a lime dosing device and a magnesium dosing device, the second reaction tank is connected to an alkali dosing device, an aeration device is provided at the bottom of the water inlet tank, the first reaction tank, the second reaction tank and the concentration tank, the aeration device is connected to an external aeration fan, and a mechanical stirrer is provided in the first reaction tank, the second reaction tank and the concentration tank;

[0018] The water outlet of the tubular membrane filtration device is connected to the water outlet tank or the lower treatment unit (such as the lower reverse osmosis treatment device) through the water outlet pipe, and a pipeline mixer is provided on the water outlet pipe, and an acid dosing device is connected to the pipeline mixer; in the pipeline mixer, the acid liquid and the outlet water are mixed to neutralize the water produced by the tubular membrane filtration device with acid to ensure that the outlet water is neutral; the concentrated water outlet of the tubular membrane filtration device returns to the concentration tank through the reflux pipe.

[0019] As a further improvement of the utility model, water is transported between the water inlet tank and the first reaction tank by a primary lift pump, a connected overflow port is provided between the first reaction tank and the second reaction tank, a connected water hole is provided between the second reaction tank and the concentration tank, and water is transported between the concentration tank and the tubular membrane filtration device by a secondary lift pump.

[0020] As a further improvement of the utility model,

[0021] The lime dosing device comprises a lime agent tank, which is connected to the dosing port of the first reaction tank through a lime drug delivery pipe, and the lime drug delivery pipe is provided with a valve and optionally a delivery pump;

[0022] The magnesium agent dosing device comprises a magnesium agent tank, which is connected to the dosing port of the first reaction tank via a magnesium agent delivery tube, and the magnesium agent delivery tube is provided with a valve and optionally a delivery pump;

[0023] The alkali dosing device comprises a liquid alkali agent tank, which is connected to the dosing port of the second reaction tank through a liquid alkali drug delivery pipe, and the liquid alkali drug delivery pipe is provided with a valve and optionally a delivery pump;

[0024] The acid dosing device comprises an acid agent tank, which is connected to the dosing port of the pipeline mixer through an acid drug delivery pipe. The acid drug delivery pipe is provided with a valve and optionally a delivery pump.

[0025] As a further improvement of the utility model, it also includes: a mud discharge pump;

[0026] The inlet of the mud discharge pump is connected to the mud outlet of the concentration tank through a mud discharge pipe, and the mud discharge pipe is also connected to a flushing branch pipe.

[0027] Compared with the prior art, the beneficial effects of the utility model are:

[0028] The utility model adopts a tubular membrane filtration device, and the mixed liquid in the concentration tank can directly enter the tubular membrane filtration device to achieve solid-liquid separation, with good effluent quality and stable operation; there is no need to add a filtration process at the back end, and the effluent can directly enter the membrane concentration treatment system, which occupies a small area;

[0029] The utility model is equipped with mechanical stirring and air stirring in the water inlet tank, two-stage reaction tank and concentration tank to ensure uniform mixing and prevent sludge from depositing at the bottom of the tank, thus reducing the workload of later operation and maintenance;

[0030] The utility model can simultaneously achieve the needs of hardness removal and silicon removal by cooperating with different agents. At the same time, after filtering through the tubular membrane, the suspended matter is effectively controlled and the effluent water quality is stable.

[0031] The utility model provides a flushing system for the mud discharge pipeline to avoid clogging of the mud discharge pipeline and affecting the operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of a solid-liquid separation treatment system for removing hardness and silicon from mine water disclosed in the utility model.

[0033] Explanation of symbols:

[0034] 1. Water inlet tank; 2. First reaction tank; 3. Second reaction tank; 4. Concentration tank; 5. Tubular membrane filtration device; 6. Water outlet tank; 7. Acid dosing device; 8. Alkali dosing device; 9. Lime dosing device; 10. Magnesium dosing device; 11. Aeration fan; 12. First-stage lifting pump; 13. Aeration device; 14. Mechanical mixer; 15. Second-stage lifting pump; 16. Mud pump. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment 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.

[0036] The utility model provides a solid-liquid separation treatment system for removing hardness and silicon from mine water, which is optimized on the existing coagulation and sedimentation hardness removal treatment system; the existing coagulation and sedimentation hardness removal treatment system includes a reaction tank and a sedimentation tank, and the effluent needs to be filtered before entering the membrane concentration treatment system; the optimized design is reflected in the use of a tubular membrane filtration device in the utility model, and the mixed liquid in the concentration tank can directly enter the tubular membrane filtration device to achieve solid-liquid separation. In addition, the utility model is equipped with mechanical stirring and air stirring in the water inlet tank, the two-stage reaction tank and the concentration tank to ensure uniform mixing while preventing sludge from depositing on the bottom of the tank, reducing the workload of later operation and maintenance; the utility model can simultaneously achieve the needs of hardness removal and silicon removal through the cooperation of different agents, and at the same time, after filtering by the tubular membrane filtration device, the suspended matter is effectively controlled, the effluent water quality is stable, and can directly enter the reverse osmosis system, thereby shortening the recovery system process and reducing investment costs and space. The mud discharge pipeline of the utility model is provided with a flushing system to avoid clogging of the mud discharge pipeline and affecting the operation of the system.

[0037] The utility model is further described in detail below in conjunction with the accompanying drawings:

[0038] like Figure 1 As shown, the utility model provides a solid-liquid separation treatment system for removing hardness and silicon from mine water, including: an inlet tank 1, a first reaction tank 2, a second reaction tank 3, a concentration tank 4, a tubular membrane filtration device 5, an outlet tank 6, an acid dosing device 7, an alkali dosing device 8, a lime dosing device 9, a magnesium dosing device 10, an aeration fan 11, a primary lift pump 12, an aeration device 13, a mechanical mixer 14, a secondary lift pump 15 and a sludge pump 16; wherein,

[0039] The water inlet pool 1 is used to receive the mine water to be treated. The bottom outlet of the water inlet pool 1 is connected to the water inlet of the first reaction pool 2 through a primary lift pump 12. An aeration device 13 is provided at the bottom of the water inlet pool 1, and the aeration device 13 is connected to an external aeration fan 11. In addition, a mechanical mixer can also be optionally provided in the water inlet pool 1. The water inlet pool 1 is intermittently aerated by the aeration device 13 to homogenize and adjust the water quality of the inlet water and prevent sludge from being deposited at the bottom of the pool.

[0040] The first reaction tank 2 is connected to the second reaction tank 3 through the overflow port at the top, and the second reaction tank 3 is connected to the concentration tank 4 through a water hole (not shown in the figure); the bottom of the first reaction tank 2, the second reaction tank 3 and the concentration tank 4 is provided with an aeration device 13, and the aeration device 13 is connected to the external aeration fan 11; further, the inlet tank 1, the first reaction tank 2, the second reaction tank 3 and the concentration tank 4 share the same aeration fan. A mechanical agitator 14 is provided in the first reaction tank 2, the second reaction tank 3 and the concentration tank 4; the first reaction tank 2, the second reaction tank 3 and the concentration tank 4 use mechanical agitation and air agitation to make the reagent fully react with the inlet water, and at the same time avoid the accumulation of sludge at the bottom of the tank after long-term operation. The first reaction tank 2 is connected with a lime dosing device 9 and a magnesium dosing device 10, and the second reaction tank 3 is connected with an alkali dosing device 8; the lime dosing device 9 includes a lime agent tank, which is connected to the dosing port of the first reaction tank 2 through a lime drug delivery pipe, and the lime drug delivery pipe is provided with a valve and a delivery pump can be optionally provided; the magnesium agent dosing device 10 includes a magnesium agent tank, which is connected to the dosing port of the first reaction tank 2 through a magnesium agent drug delivery pipe, and the magnesium agent drug delivery pipe is provided with a valve and a delivery pump can be optionally provided; the alkali dosing device 8 includes a liquid alkali agent tank, which is connected to the dosing port of the second reaction tank 3 through a liquid alkali drug delivery pipe, and the liquid alkali drug delivery pipe is provided with a valve and a delivery pump can be optionally provided. The utility model adds lime and magnesium to the first reaction tank 2, and adds liquid alkali to the second reaction tank 3, so as to realize different chemical reactions, achieve the purpose of removing hardness and silicon, and avoid affecting its precipitation effect. Furthermore, the concentration tank 4 adopts a double tank structure, so that the mine water stays in the concentration tank 4 for a longer time, allowing the chemical reaction to proceed more thoroughly; the concentration tank 4 is provided with two mud buckets to facilitate mud discharge, and a vortex is formed inside the concentration tank 4 to achieve a completely mixed state.

[0041] The water outlet of the concentration tank 4 is connected to the water inlet of the tubular membrane filter device 5 through the secondary lift pump 15, and the water outlet of the tubular membrane filter device 5 is connected to the water outlet tank 6 or the lower treatment unit (such as the lower reverse osmosis treatment device) through the outlet pipe. A pipeline mixer is provided on the outlet pipe, and an acid dosing device 7 is connected to the pipeline mixer. The acid dosing device 7 includes an acid agent tank, which is connected to the dosing port of the pipeline mixer through an acid delivery pipe. The acid delivery pipe is provided with a valve and a delivery pump. In the pipeline mixer, the acid liquid and the effluent are mixed to neutralize the water produced by the tubular membrane filter device 5 with acid to ensure that the effluent is neutral; the concentrated water outlet of the tubular membrane filter device 5 returns to the concentration tank 4 through the reflux pipe for circulation treatment. Among them, the tubular membrane filtration device 5 is a conventional membrane filtration device, which realizes solid-liquid separation through the interception and filtration of membrane elements; the tubular membrane has good water output effect, and the turbidity of the produced water is generally equivalent to that of the hollow fiber ultrafiltration membrane, and can directly enter the reverse osmosis system, thereby shortening the recovery system process and reducing investment costs and space.

[0042] The inlet of the sludge pump 16 is connected to the sludge outlet of the thickening tank 4 through a sludge pipe, and a flushing branch pipe is also connected to the sludge pipe. Furthermore, a sensor for detecting sludge concentration is provided in the thickening tank 4, and the sensor is interlocked with the valve of the sludge pipe or the sludge pump 16; when the sludge concentration in the thickening tank is high, automatic sludge discharge can be achieved. At the same time, in order to prevent the sludge pipeline from being blocked and affecting the sludge discharge, the thickening tank 4 and the sludge pipe can be flushed through the flushing branch pipe.

[0043] The method of using the utility model includes:

[0044] The mine water first enters the water inlet tank 1, and then is lifted to the first reaction tank 2 by the first-stage lifting pump 12. The effluent of the first reaction tank 2 enters the second reaction tank 3. Different reagents are added in the first reaction tank 2 and the second reaction tank 3 to achieve the purpose of hardness removal and silicon removal. Then the effluent of the second reaction tank 3 enters the concentration tank 4, and then is lifted to the tubular membrane filtration device 5 by the second-stage lifting pump 15 to achieve solid-liquid separation. The concentrated water returns to the concentration tank 4, and the produced water enters the effluent tank 6 after pH adjustment. The effluent can directly enter the reverse osmosis system. The concentration tank is regularly discharged, and the sludge discharge system is set to flush to prevent pipeline blockage.

[0045] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A solid-liquid separation treatment system for removing hardness and silicon from mine water, characterized in that: include: A water inlet tank, a first reaction tank, a second reaction tank, a concentration tank and a tubular membrane filtration device are sequentially connected along the treatment direction of the mine water; The first reaction tank is connected to a lime dosing device and a magnesium dosing device, the second reaction tank is connected to an alkali dosing device, an aeration device is provided at the bottom of the water inlet tank, the first reaction tank, the second reaction tank and the concentration tank, the aeration device is connected to an external aeration fan, and a mechanical stirrer is provided in the first reaction tank, the second reaction tank and the concentration tank; The water outlet of the tubular membrane filtration device is connected to the water outlet tank or the lower processing unit through a water outlet pipe, and a pipeline mixer is provided on the water outlet pipe, and an acid dosing device is connected to the pipeline mixer; the concentrated water outlet of the tubular membrane filtration device returns to the concentration tank through a reflux pipe.

2. The solid-liquid separation treatment system for removing hardness and silicon from mine water according to claim 1, characterized in that: A primary lift pump is used to transport water between the water inlet tank and the first reaction tank, a connected overflow port is provided between the first reaction tank and the second reaction tank, a connected water hole is provided between the second reaction tank and the concentration tank, and a secondary lift pump is used to transport water between the concentration tank and the tubular membrane filtration device.

3. The solid-liquid separation treatment system for removing hardness and silicon from mine water according to claim 1, characterized in that: The lime dosing device comprises a lime agent tank, which is connected to the dosing port of the first reaction tank through a lime agent delivery pipe, and a valve is provided on the lime agent delivery pipe. The magnesium agent dosing device comprises a magnesium agent tank, which is connected to the dosing port of the first reaction tank through a magnesium agent delivery pipe, and a valve is provided on the magnesium agent delivery pipe; The alkali dosing device comprises a liquid alkali agent tank, the liquid alkali agent tank is connected to the dosing port of the second reaction tank through a liquid alkali drug delivery pipe, and a valve is provided on the liquid alkali drug delivery pipe; The acid dosing device comprises an acid agent tank, which is connected to the dosing port of the pipeline mixer through an acid drug delivery pipe, and a valve is provided on the acid drug delivery pipe.

4. The solid-liquid separation treatment system for removing hardness and silicon from mine water according to claim 1, characterized in that: Also includes: Mud pump; The inlet of the mud discharge pump is connected to the mud outlet of the concentration tank through a mud discharge pipe, and the mud discharge pipe is also connected to a flushing branch pipe.

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