Advanced treatment system for cement kiln flue gas wet desulphurization wastewater

Abstract

The utility model discloses an advanced treatment system for cement kiln flue gas wet desulphurization wastewater, which comprises an ultrafiltration mechanism, an electrodialysis mechanism, a wet desulphurization mechanism, a wet desulphurization mechanism, a wet desulphurization mechanism, a wet desulphurization mechanism and a wet desulphurization mechanism, and is characterized in that the ultrafiltration mechanism is connected with the electrodialysis mechanism and is used for removing suspended matters, colloidal impurities, tiny particles and bacteria in wastewater; the electrodialysis mechanism is connected with the nanofiltration mechanism and is used for separating electrolyte in the wastewater through the selective permeability of an ion exchange membrane; the nanofiltration mechanism is connected with the reverse osmosis mechanism and is used for separating organic matters and divalent salt ions in the wastewater; the reverse osmosis mechanism is connected with the recycling equipment and is used for removing charged ions, inorganic matters, colloidal particles, bacteria and organic matters in the wastewater; the input end of the triple-effect evaporation mechanism is connected with the electrodialysis mechanism, the output end of the triple-effect evaporation mechanism is connected with the reverse osmosis mechanism, the triple-effect evaporation mechanism is used for desalting high-concentration crystal slurry generated by treating electrodialysis concentrated liquor, and generated centrifugal mother liquor continues to be treated by the reverse osmosis mechanism; the dosing mechanism is respectively connected with the nanofiltration mechanism and the reverse osmosis mechanism and is used for providing required medicaments for the nanofiltration mechanism and the reverse osmosis mechanism.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the desulfurization wastewater treatment technical field, concretely relates to a cement kiln flue gas wet desulfurization wastewater advanced treatment system. BACKGROUND

[0002] In the actual application process of the cement kiln flue gas desulfurization system, the slurry in the desulfurization absorption tower is repeatedly recycled, and the soluble salt slurry in the tower is continuously concentrated, in order to ensure the desulfurization performance and maintain the Cl - Balance in the system, the slurry needs to be continuously supplemented and updated, and in this process, wastewater containing a large amount of dissolved salt and heavy metal ions is discharged, and this part of the discharged wastewater is "desulfurization wastewater". - The desulfurization wastewater is usually weakly acidic, has a high Cl And salt content, contains COD, ammonia nitrogen and various heavy metal ion pollutants, has strong corrosion, and has great harm to the environment, and has great difficulty in deep purification treatment and comprehensive utilization.

[0003] At present, the desulfurization wastewater treatment in the industry mainly uses the triple box (neutralization, flocculation and sedimentation) process, and the desulfurization wastewater is treated by the traditional process of "neutralization, flocculation and sedimentation". CONTENT OF THE UTILITY MODEL

[0004] Therefore, the main purpose of the utility model is to provide a cement kiln flue gas wet desulfurization wastewater advanced treatment system.

[0005] To achieve the above purpose, the technical scheme of the utility model is as follows:

[0006] The utility model embodiment provides a cement kiln flue gas wet desulfurization wastewater advanced treatment system, and the system comprises:

[0007] The ultrafiltration mechanism is connected with the electrodialysis mechanism, is used for removing suspended solids, colloidal impurities, micro-particles and bacteria in the accessed wastewater, and the filtered wastewater is delivered to the electrodialysis mechanism;

[0008] The electrodialysis mechanism is connected with the nanofiltration mechanism, is used for separating electrolytes in the wastewater through the selective permeability of the ion exchange membrane;

[0009] The nanofiltration mechanism is connected with the reverse osmosis mechanism, is used for separating organic matter and divalent salt ions in the wastewater;

[0010] The reverse osmosis mechanism is connected with the reuse equipment, is used for removing charged ions, inorganic matter, colloidal particles, bacteria and organic matter in the wastewater;

[0011] The input end of the triple-effect evaporation mechanism is connected with the electrodialysis mechanism, and the output end is connected with the reverse osmosis mechanism, which is used for desalination of high-concentration crystal slurry generated by the electrodialysis mechanism, and centrifugal mother liquor generated is further treated by the reverse osmosis mechanism.

[0012] The dosing mechanism is connected with the nanofiltration mechanism and the reverse osmosis mechanism respectively, and is used for providing required reagents.

[0013] In the scheme, the ultrafiltration mechanism comprises a multi-medium filter, an activated carbon filter, an ultrafiltration assembly and an ultrafiltration water pool; the multi-medium filter, the activated carbon filter, the ultrafiltration assembly and the ultrafiltration water pool are sequentially connected through pipelines; the ultrafiltration assembly is provided with a water outlet and a concentrated water outlet; the water outlet is connected with the ultrafiltration water pool; and the concentrated water outlet is connected with the triple-effect box.

[0014] In the scheme, the electrodialysis mechanism comprises an electrodialysis assembly, an electrodialysis water pool and an electrodialysis concentrated liquid pool; the electrodialysis assembly is connected with the electrodialysis water pool and the electrodialysis concentrated liquid pool respectively; the electrodialysis assembly is provided with a water outlet and a concentrated water outlet; the water outlet is connected with the electrodialysis water pool; and the concentrated water outlet is connected with the electrodialysis concentrated liquid pool.

[0015] In the scheme, the nanofiltration mechanism comprises a nanofiltration assembly, a nanofiltration water pool and a nanofiltration concentrated water pool; the nanofiltration assembly is connected with the nanofiltration water pool and the nanofiltration concentrated water pool respectively; the nanofiltration assembly is provided with a water outlet and a concentrated water outlet; the water outlet is connected with the nanofiltration water pool; and the concentrated water outlet is connected with the nanofiltration concentrated water pool.

[0016] In the scheme, the reverse osmosis mechanism comprises a reverse osmosis assembly, a reverse osmosis water pool and a reverse osmosis concentrated water pool; the reverse osmosis assembly is connected with the reverse osmosis water pool and the reverse osmosis concentrated water pool respectively; the reverse osmosis assembly is provided with a water outlet and a concentrated water outlet; the water outlet is connected with the reverse osmosis water pool; and the concentrated water outlet is connected with the reverse osmosis concentrated water pool.

[0017] In the scheme, the reverse osmosis concentrated water pool is further connected with the ultrafiltration water pool of the ultrafiltration mechanism.

[0018] In the scheme, the water inlet of the triple-effect evaporation mechanism is connected with the water outlet of the electrodialysis concentrated liquid pool through a pipeline; and the water outlet is connected with the reverse osmosis water pool.

[0019] In the scheme, the dosing mechanism comprises a reducing agent dosing assembly and a scale inhibitor dosing assembly; the outlet of the reducing agent dosing assembly is connected with the water inlets of the nanofiltration assembly and the reverse osmosis assembly through pipelines respectively; and the outlet of the scale inhibitor dosing assembly is connected with the water inlet of the reverse osmosis assembly through a pipeline.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] The utility model discloses a set up ultrafiltration mechanism, electrodialysis mechanism, nanofiltration mechanism, reverse osmosis mechanism, three effect evaporation mechanism, dosing mechanism solve the traditional triple box treatment process to handle the problem of not thoroughly of desulfurization wastewater.

[0022] The utility model discloses advanced, reasonable, reliable combination treatment process, under the premise of ensuring treatment discharge requirement, realize a kind of cement kiln flue gas wet desulfurization wastewater advanced treatment, with simple operation, easy management, small footprint, investment is saved, low operating cost and other advantages, with strong stability, system processing water can be used for circulating water make-up water, system has no sewage discharge, realize liquid phase "zero discharge". BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings described herein are used to disclose further understanding of the utility model, constitute a part of the utility model, and the illustrative embodiment of the utility model and its explanation are used to explain the utility model, and do not constitute undue limitation to the utility model.In the drawings:

[0024] Figure 1 Provide a kind of cement kiln flue gas wet desulfurization wastewater advanced treatment system's connection schematic diagram for the utility model embodiment. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantage of the utility model more clear and obvious, the following is connected with drawing and embodiment, and the utility model is further detailedly explained.It should be understood that the specific embodiment described here is only used to explain the utility model, and is not used to limit the utility model.

[0026] Same or similar reference numerals in the drawing of the embodiment correspond to same or similar components;In the description of the utility model, it should be understood that the orientation or position relationship indicated by terms "upper", "lower", "left", "right", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawing, and is only for the convenience of describing the utility model and simplifying the description, and is not indicative or suggestive of the device or element indicated must have a particular orientation, a particular orientation and operation, therefore, the position relationship of the term described in the drawing is only used for example, and can not be understood as the limitation of the patent, for the ordinary skilled in the art, can understand the specific meaning of the above terms according to specific circumstances.

[0027] It is to be understood that the terms "including", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, article, or apparatus. Without further limitation, an element defined by an "including a" statement does not exclude the existence of additional identical elements in the process, article, or apparatus including the element.

[0028] The embodiment of the utility model provides a cement kiln flue gas wet desulphurization wastewater advanced treatment system, as shown in the picture, the system includes: Figure 1

[0029] The ultrafiltration mechanism 1 is connected with the electrodialysis mechanism 2, is used to remove the suspended matter, colloidal impurities, tiny particles and bacteria in the access wastewater, and the filtered wastewater is delivered to the electrodialysis mechanism 2;

[0030] The electrodialysis mechanism 2 is connected with the nanofiltration mechanism 3, is used to separate the electrolyte in the wastewater through the selective permeability of ion exchange membrane;

[0031] The nanofiltration mechanism 3 is connected with the reverse osmosis mechanism 4, is used to separate the organic matter and divalent salt ion in the wastewater;

[0032] The reverse osmosis mechanism 4 is connected with the reuse equipment, is used to remove the charged ion, inorganic matter, colloidal particle, bacteria and organic matter in the wastewater;

[0033] The input end of the three-effect evaporation mechanism 5 is connected with the electrodialysis mechanism 2, and the output end is connected with the reverse osmosis mechanism 4, is used to handle the high concentration slurry produced by the electrodialysis concentrated solution to desalt, and the centrifugal mother liquor produced is handled by the reverse osmosis mechanism 4;

[0034] The dosing mechanism 6 is connected with the nanofiltration mechanism 3 and the reverse osmosis mechanism 4 respectively, is used to provide the required medicament.

[0035] The utility model discloses a ultrafiltration mechanism 1, electrodialysis mechanism 2, nanofiltration mechanism 3, reverse osmosis mechanism 4, three-effect evaporation mechanism 5, dosing mechanism 6 are set up, among them, for the ultrafiltration mechanism, by front end adding multi -media filter, activated carbon filter, ultrafiltration device is matched with self -cleaning filter to remove cement sand, rust, colloidal substance, pigment, peculiar smell, a large number of biochemical organic matter to guarantee the subsequent device " desalination " operation smooth.

[0036] For the electrodialysis mechanism, by adjusting the electrodialysis ion exchange membrane and the baffle and the two end electrode assembly mode, the contact area and time are as far as possible increased to as far as possible improve the desalination efficiency of the electrodialysis device, and the processing load of subsequent mechanism is reduced.

[0037] ​For the nanofiltration mechanism and the reverse osmosis mechanism, a large-flux precision filter is matched to remove residual suspended matter, non-spherical particles and colloids in water, so that the subsequent equipment operation is safer and more reliable. The filter core is a 5um melt-blown filter core, and the purpose is to remove the impurities larger than 5um leaked by the upper filtering unit. It prevents the impurities from entering the nanofiltration and reverse osmosis device to damage the surface of the membrane, thereby damaging the desalination performance of the membrane.

[0038] A plurality of measures are taken, so that the problem of incomplete treatment of desulfurization wastewater by the traditional triple box treatment process is effectively solved. In addition, a series of operations such as backwashing and forward flushing are performed through the full-automatic controller. The water quality produced by the equipment is guaranteed, and the service life of the equipment is prolonged. The utility model optimizes the advanced, reasonable and reliable combined treatment process, realizes the deep treatment of the cement kiln flue gas wet desulfurization wastewater under the premise of ensuring the treatment and discharge requirements, has the advantages of simple operation, convenient management, small occupation, low investment and low operation cost, has strong stability, and the system treatment water can be used for circulating water supplement water, the system has no sewage discharge, realizes liquid phase "zero discharge".

[0039] The utility model discloses according to the process characteristics of ultrafiltration mechanism 1, electrodialysis mechanism 2, nanofiltration mechanism 3, reverse osmosis mechanism 4, the concentrated water produced by each mechanism is organically integrated, is repeatedly handled, and the subsequent evaporation system processing scale can be reduced.

[0040] The three-effect evaporation mechanism 5 of the utility model adopts the downflow evaporation, utilizes the high temperature of the first effect to reduce the solution viscosity, improve the concentration ratio of the equipment and the high boiling point temperature rise problem, and ensure the continuous and stable operation of the system.

[0041] Specifically, the ultrafiltration mechanism 1 includes a multi-medium water supply tank 101, a multi-medium filter 102, an activated carbon filter 103, an ultrafiltration assembly 104 and an ultrafiltration water tank 105. The multi-medium water supply tank 101, the multi-medium filter 102, the activated carbon filter 103, the ultrafiltration assembly 104 and the ultrafiltration water tank 105 are sequentially connected by pipelines. The ultrafiltration assembly 104 is provided with a water outlet and a concentrated water outlet. The water outlet is connected with the ultrafiltration water tank 105, and the concentrated water outlet is connected with the triple box 7.

[0042] The ultrafiltration assembly 104 is selected from a capillary structure, which is an upgraded version of hollow fiber ultrafiltration membrane technology. The filter membrane material is a high-dimensional mesh structure PVDF, and the membrane hole diameter is 0.10 microns. The recovery rate of the ultrafiltration assembly is more than 90%.

[0043] The multi-medium filter 102 is connected to the desulfurization wastewater of the triple box 7.

[0044] The ultrafiltration mechanism 1 can further remove suspended solids and colloidal impurities in wastewater, and effectively remove micro-particles and bacteria that cannot be removed by the existing triple box 7.

[0045] The electrodialysis mechanism 2 comprises an electrodialysis assembly 201, an electrodialysis water production tank 202, and an electrodialysis concentrated liquid tank 203; the electrodialysis assembly 201 is connected with the electrodialysis water production tank 202 and the electrodialysis concentrated liquid tank 203 respectively, and is provided with a water outlet and a concentrated liquid outlet; the water outlet is communicated with the electrodialysis water production tank 202, and the concentrated liquid outlet is communicated with the electrodialysis concentrated liquid tank 203.

[0046] The electrodialysis assembly 201 is essentially assembled by ion exchange membranes, separators and two electrodes, and can be divided into three parts, namely an anode chamber, an intermediate chamber and a cathode chamber. Under the action of direct current, positive and negative ions migrate to the cathode and anode respectively through the membrane. Finally, in the intermediate chamber between the two membranes, the concentration of salt is reduced, and the produced water is the electrodialysis water; the anode chamber and the cathode chamber are concentrated chambers, and the salt concentration in the area is sharply increased, which is the electrodialysis concentrated liquid.

[0047] The electrodialysis mechanism 2 mainly utilizes the selective permeability of the ion exchange membrane to separate the electrolyte, so as to realize the desalination and concentration of the wastewater.

[0048] The nanofiltration mechanism 3 comprises a nanofiltration assembly 301, a nanofiltration water production tank 302, and a nanofiltration concentrated liquid tank 303; the nanofiltration assembly 301 is connected with the nanofiltration water production tank 302 and the nanofiltration concentrated liquid tank 303 respectively, and is provided with a water outlet and a concentrated liquid outlet; the water outlet is communicated with the nanofiltration water production tank 302, and the concentrated liquid outlet is communicated with the nanofiltration concentrated liquid tank 303.

[0049] The nanofiltration assembly 301 adopts a nanofiltration membrane, which is a charged membrane with a pore size of about several nanometers. Its internal structure can be simply described as a plurality of "membrane bags" wound outside a porous central tube to form a plurality of "membrane bags", three edges of the membrane bag are sealed, and the other edge is sealed on the porous central tube. A permeate flow channel is formed in the membrane bag by a porous support material. Through the screening and dissolution diffusion of the nanofiltration membrane and the charge repulsion effect, the nanofiltration salt separation function is realized.

[0050] The nanofiltration concentrated liquid in the nanofiltration concentrated liquid tank 303 can be used as make-up water for a desulfurization system.

[0051] The nanofiltration mechanism 3 can effectively separate organic matter and divalent salt ions in the wastewater, which helps to improve the concentration efficiency of the subsequent reverse osmosis mechanism 4.

[0052] The reverse osmosis mechanism 4 comprises a reverse osmosis assembly 401, a reverse osmosis water production tank 402, and a reverse osmosis concentrated liquid tank 403; the reverse osmosis assembly 401 is connected with the reverse osmosis water production tank 402 and the reverse osmosis concentrated liquid tank 403 respectively, and is provided with a water outlet and a concentrated liquid outlet; the water outlet is communicated with the reverse osmosis water production tank 402, and the concentrated liquid outlet is communicated with the reverse osmosis concentrated liquid tank 403.

[0053] The reverse osmosis component 401 adopts a reverse osmosis membrane group, mainly a highly ordered matrix structure of a polyamide composite membrane, and has a specification size of 4 / 5 core 8-inch membrane component, and a filter membrane pore size of about 0.1-10 nanometers. Water purification and separation are realized through high-pressure pump pressure driving, and the working pressure is usually 1.0 Mpa.

[0054] The reverse osmosis mechanism 4 can effectively remove charged ions, inorganic matter, colloidal particles, bacteria and organic matter in the wastewater, and ensure that the produced water meets the requirements of the circulating water replenishment index.

[0055] The reverse osmosis concentrated water tank 403 is also in communication with the ultrafiltration produced water tank 105 of the ultrafiltration mechanism 1.

[0056] The water inlet of the three-effect evaporation mechanism 5 is in communication with the water outlet of the electrodialysis concentrated liquid tank 203 through a pipeline, and the water outlet is in communication with the reverse osmosis produced water tank 403.

[0057] The three-effect evaporation mechanism 5 is aimed at the electrodialysis concentrated liquid (high-salt water), the generated high-concentration crystal slurry enters the centrifuge for desalination, and the generated centrifugal mother liquor enters the three-effect evaporation system for continuous evaporation treatment, so as to achieve the purpose of wastewater evaporation reuse.

[0058] The dosing mechanism 6 includes a reducing agent dosing component 601 and a scale inhibitor dosing component 602, the outlet of the reducing agent dosing component 601 is connected with the water inlets of the filter component 301 and the reverse osmosis component 401 through pipelines respectively, and the outlet of the scale inhibitor dosing component 602 is connected with the water inlet of the reverse osmosis component 401 through a pipeline.

[0059] The above is only a preferred embodiment of the present application, and is not used to limit the protection scope of the present application.

Claims

1. A cement kiln flue gas wet desulphurization wastewater advanced treatment system, characterized in that, The system comprises: The ultrafiltration mechanism is connected with the electrodialysis mechanism, and is used for removing suspended matters, colloidal impurities, and micro-particles and bacteria in the accessed wastewater, and delivering the filtered wastewater to the electrodialysis mechanism; The electrodialysis mechanism is connected with the nanofiltration mechanism, and is used for separating electrolytes in the wastewater through the selective permeability of the ion exchange membrane; The nanofiltration mechanism is connected with the reverse osmosis mechanism, and is used for separating organic matters and divalent salt ions in the wastewater; The reverse osmosis mechanism is connected with the reuse device, and is used for removing charged ions, inorganic matters, colloidal particles, bacteria and organic matters in the wastewater; The input end of the triple-effect evaporation mechanism is connected with the electrodialysis mechanism, and the output end is connected with the reverse osmosis mechanism, and is used for processing high-concentration crystal slurry generated by the electrodialysis to remove salt, and centrifugal mother liquor generated by the processing is continuously processed by the reverse osmosis mechanism; The dosing mechanism is connected with the nanofiltration mechanism and the reverse osmosis mechanism respectively, and is used for providing required reagents to the nanofiltration mechanism and the reverse osmosis mechanism.

2. The system for advanced treatment of cement kiln flue gas wet desulphurization wastewater according to claim 1, characterized in that, The ultrafiltration mechanism comprises a multi-medium filter, an activated carbon filter, an ultrafiltration assembly, and an ultrafiltration water pool; the multi-medium filter, the activated carbon filter, the ultrafiltration assembly, and the ultrafiltration water pool are sequentially connected through pipelines, and the ultrafiltration assembly is provided with a water outlet and a concentrated water outlet; the water outlet is connected with the ultrafiltration water pool, and the concentrated water outlet is connected with a triple-effect box.

3. The system for advanced treatment of cement kiln flue gas wet desulfurization wastewater according to claim 1 or 2, characterized in that, The electrodialysis mechanism comprises an electrodialysis assembly, an electrodialysis water pool, and an electrodialysis concentrated water pool; the electrodialysis assembly is connected with the electrodialysis water pool and the electrodialysis concentrated water pool respectively; the electrodialysis assembly is provided with a water outlet and a concentrated water outlet; the water outlet is connected with the electrodialysis water pool, and the concentrated water outlet is connected with the electrodialysis concentrated water pool.

4. The system for advanced treatment of cement kiln flue gas wet desulphurization wastewater according to claim 3, characterized in that, The nanofiltration mechanism comprises a nanofiltration assembly, a nanofiltration water pool, and a nanofiltration concentrated water pool; the nanofiltration assembly is connected with the nanofiltration water pool and the nanofiltration concentrated water pool respectively; the nanofiltration assembly is provided with a water outlet and a concentrated water outlet; the water outlet is connected with the nanofiltration water pool, and the concentrated water outlet is connected with the nanofiltration concentrated water pool.

5. The system for advanced treatment of cement kiln FGD wastewater according to claim 4, characterized in that, The reverse osmosis mechanism comprises a reverse osmosis assembly, a reverse osmosis water pool, and a reverse osmosis concentrated water pool; the reverse osmosis assembly is connected with the reverse osmosis water pool and the reverse osmosis concentrated water pool respectively; the reverse osmosis assembly is provided with a water outlet and a concentrated water outlet; the water outlet is connected with the reverse osmosis water pool, and the concentrated water outlet is connected with the reverse osmosis concentrated water pool.

6. The system for advanced treatment of cement kiln flue gas wet desulphurization wastewater according to claim 5, characterized in that, The reverse osmosis concentrated water pool is also connected with the ultrafiltration water pool of the ultrafiltration mechanism.

7. The system for advanced treatment of cement kiln flue gas wet desulphurization wastewater according to claim 6, characterized in that, The water inlet of the triple-effect evaporation mechanism is connected with the water outlet of the electrodialysis concentrated water pool through a pipeline, and the water outlet is connected with the reverse osmosis water pool.

8. The system for advanced treatment of cement kiln flue gas wet desulphurization wastewater according to claim 7, characterized in that, The reducing agent dosing assembly is connected with the water inlets of the nanofiltration assembly and the reverse osmosis assembly through pipelines respectively, and the outlet of the scale inhibitor dosing assembly is connected with the water inlet of the reverse osmosis assembly through a pipeline.

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