High-salt wastewater treatment system

Abstract

The utility model discloses a high-salt wastewater treatment system, wherein a high-salt wastewater pool, a sedimentation tank, a sand filter, a purification pool, a tubular microporous filter, a filter water tank, a heater, a bag filter, an ultrafiltration device, an ultrafiltration pool, a weak acid bed, a softening pool, a primary concentration reverse osmosis device, a primary concentrate tank, a secondary concentration reverse osmosis device, a secondary concentrate tank, and an MVR evaporator are sequentially connected in series through pipelines along the water flow direction of the concentrated water concentrate, the MVR evaporator is connected to a hazardous waste treatment device, the sedimentation tank is connected to a sludge buffer tank through a pipeline, the sludge buffer tank is connected to a filter press through a pipeline 1, and the high-salt sludge treated by the filter press is transported out; the primary concentration reverse osmosis device, the secondary concentration reverse osmosis device, and the MVR evaporator are respectively connected to the whole plant reuse water pool through pipelines. The utility model realizes a significant reduction in high-salt wastewater, effectively saves water resources, and has significant environmental protection and economic benefits.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial wastewater discharge, in particular to a high-salt wastewater treatment system. Background Art

[0002] Thermal power plants are major users of industrial water in my country, with huge water and discharge volumes. The "zero discharge" of wastewater from coal-fired power plants is increasingly being mentioned. As a major water consumer, thermal power plants face a sharp increase in pressure on water resource constraints and emission restrictions. Accelerating the implementation of deep water conservation and "zero discharge" of wastewater has become an inevitable choice. With the continuous advancement of environmental protection technology and the innovation of environmental protection concepts, some leading coal-fired power plants have begun to make advanced layouts and reasonable plans. Utility Model Content

[0003] The utility model is to overcome the shortcomings of the above-mentioned prior art and provide a high-salt wastewater treatment system. The utility model not only achieves a significant reduction in high-salt wastewater or even (near) zero discharge, but also recovers the heat of the condensed water of the MVR evaporator. At the same time, the fresh water produced by reverse osmosis and the condensed water after cooling are all recovered to the whole plant reuse water pool, effectively saving water resources, solving the problem of high-salt industrial wastewater discharge in the thermal power and power generation industries, alleviating the problem of water resources and energy shortages, and having significant environmental protection and economic benefits.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] A high-salt wastewater treatment system, comprising a water pool, a filtering device, a heater, a concentration and reverse osmosis device, and an MVR evaporator. The water pool comprises a high-salt wastewater pool, a sedimentation tank, a sand filter, a purified water pool, and a softened water pool. The filtering device comprises a tubular microporous filter, a filter water tank, a bag filter, an ultrafiltration device, an ultrafiltration water pool, and a weak acid bed. The concentration and reverse osmosis device comprises a primary concentration reverse osmosis device, a primary concentrated liquid tank, a secondary concentration reverse osmosis device, and a secondary concentrated liquid tank. The high-salt wastewater pool, the sedimentation tank, the sand filter, the purified water pool, the tubular microporous filter, the filter water tank, the heater, Bag filter, ultrafiltration device, ultrafiltration water pool, weak acid bed, softening water pool, primary concentration reverse osmosis device, primary concentrate tank, secondary concentration reverse osmosis device, secondary concentrate tank, MVR evaporator are connected in series along the flow direction of concentrated water through pipelines, MVR evaporator is connected to hazardous waste treatment device, sedimentation tank is connected to sludge buffer tank through pipeline, sludge buffer tank is connected to filter press through pipeline 1, and high-salt sludge treated by filter press is transported out; primary concentration reverse osmosis device, secondary concentration reverse osmosis device and MVR evaporator are connected to the reuse water pool of the whole plant through pipelines respectively.

[0006] The sludge buffer tank is connected to the high-salt wastewater pool through an overflow water pipeline, and the filter press is connected to the sludge buffer tank through pipeline 2.

[0007] The sand filter, tubular microporous filter, bag filter and ultrafiltration device are respectively connected to the high-salt wastewater pool through pipeline three.

[0008] The ultrafiltration pool is connected to the ultrafiltration device through pipeline four.

[0009] The weak acid bed is connected to the neutralization water tank through a pipeline, and the neutralization water tank is connected to the high-salt wastewater tank through pipeline five.

[0010] The sedimentation tank is a high-density sedimentation tank, into which substances capable of reducing suspended matter, hardness, alkalinity, and COD pollutants in water are added.

[0011] The high-density sedimentation tank includes a mixing zone, a flocculation zone, and a sedimentation zone.

[0012] The sand filter tank is filled with quartz sand filter material, magnetite filter material, porous ceramic filter material or manganese sand filter material for removing insoluble solid suspended matter and colloid in raw water.

[0013] The weak acid bed is filled with weak acid cation exchange resin for high-salt wastewater.

[0014] The beneficial effects of the utility model are:

[0015] The utility model comprises a high-salt wastewater pool, a sedimentation tank, a sand filter, a purified water pool, a tubular microporous filter, a filtered water tank, a heater, a bag filter, an ultrafiltration device, an ultrafiltration water pool, a weak acid bed, a softening water pool, a primary concentration reverse osmosis device, a primary concentrated liquid tank, a secondary concentration reverse osmosis device, a secondary concentrated liquid tank, and an MVR evaporator which are sequentially connected in series through pipelines along the flow direction of the concentrated water; the MVR evaporator is connected to a hazardous waste treatment device; the sedimentation tank is connected to a sludge buffer tank through a pipeline; the sludge buffer tank is connected to a filter press through a pipeline 1; and the high-salt sludge treated by the filter press is transported out; the primary concentration reverse osmosis device, the secondary concentration reverse osmosis device, and the MVR evaporator are respectively connected to the whole plant reuse water pool through pipelines, thereby realizing efficient removal of hardness, suspended solids, colloids, organic matter, etc. in industrial wastewater; the system can effectively reduce the salt content in the water and basically realize zero discharge of concentrated brine. In addition, the heat of the condensed water of the MVR evaporator is recovered. At the same time, the fresh water produced by reverse osmosis and the condensed water after cooling are all recycled to the reuse water pool of the whole plant, which effectively saves water resources, solves the problem of discharge of high-salt industrial wastewater in thermal power and power generation industries, and alleviates the problem of water resources and energy shortages. It has significant environmental and economic benefits.

[0016] 2. The effluent from the high-density clarification tank has good water quality, which can effectively buffer the changes in the incoming water quality and water volume load. The sludge is simultaneously concentrated, which is beneficial to reducing the load on the sludge treatment system.

[0017] 3. The use of a multi-stage filtration structure is conducive to the stable operation of the membrane concentration system and ensures the water quality of the membrane desalination water.

[0018] 4. The first-stage reverse osmosis device adopts a two-stage structure with a high recovery rate.

[0019] 5. High pH operation and weak acid ion exchange resin can completely remove the hardness of concentrated water from the first-stage reverse osmosis device.

[0020] 6. The secondary reverse osmosis adopts a high-concentration three-stage reverse osmosis process, which can increase the concentration of concentrated water at a lower pressure, improve the recovery rate, and reduce operating energy.

[0021] 7. The high-density sedimentation tank includes a mixing zone, a flocculation zone, and a sedimentation zone, which integrates the functions of coagulation, flocculation, sedimentation, and sludge concentration. It also provides nuclei for the flocculation process by returning the sediment sludge, ensuring that the floc particles are large and dense.

[0022] 8. The filter press is connected to the sludge buffer tank through pipeline 2 to recover the filtrate from the filter press.

[0023] 9. The ultrafiltration water pool is connected to the ultrafiltration device through pipeline 4 and provides backwash water to the ultrafiltration device, thereby meeting the ultrafiltration process requirements that the ultrafiltration device needs to use filtered water for backwashing.

[0024] 10. The neutralization pool is connected to the high-salt wastewater pool through pipeline 5 to recover, treat and reuse the ion exchanger regeneration wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0026] Attached middle school, high-salt wastewater pool 1, high-density sedimentation tank 2, sand filter 3, purified water pool 4, tubular microporous filter 5, filtered water tank 6, heater 7, bag filter 8, ultrafiltration device 9, ultrafiltration water pool 10, weak acid bed 11, softening water pool 12, primary concentration reverse osmosis device 13, primary concentrate tank 14, secondary concentration reverse osmosis device 15, secondary concentrate tank 16, MVR evaporator 17, neutralization water pool 18, sludge buffer tank 19, filter press 20, plant reuse water pool 21, overflow water pipeline 22, pipeline one 23, pipeline two 24, pipeline five 25, pipeline four 26, pipeline three 27. Specific implementation methods

[0027] In order to make the purpose, technical solution, purpose and effect of the utility model clear and easy to understand, the preferred embodiments of the utility model will be described in detail below with reference to the accompanying drawings so that technicians can understand.

[0028] It should be noted that in the description of the present utility model, unless otherwise clearly defined and limited, the terms “installed”, “connected”, “connected”, “connected”, etc. should be understood in a broad sense, that is, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0029] Example:

[0030] As shown in the figure, a high-salt wastewater treatment system includes a high-salt wastewater pool 1, a high-density sedimentation tank 2, a sand filter 3, a purification pool 4, a tubular microporous filter 5, a filter water tank 6, a heater 7, a bag filter 8, an ultrafiltration device 9, an ultrafiltration pool 10, a weak acid bed 11, a softening water pool 12, a primary concentration reverse osmosis device 13, a primary concentrate tank 14, a secondary concentration reverse osmosis device 15, a secondary concentrate tank 16, an MVR evaporator 17, a neutralization pool 18, a sludge buffer tank 19, a filter press 20, a whole plant reuse water pool 21, an overflow water pipeline 22, a pipeline one 23, a pipeline two 24, a pipeline five 25, a pipeline four 26, and a pipeline three 27.

[0031] The high-salt wastewater pool 1, high-density sedimentation tank 2, sand filter 3, purified water pool 4, tubular microporous filter 5, filtered water tank 6, heater 7, bag filter 8, ultrafiltration device 9, ultrafiltration water pool 10, weak acid bed 11, softening water pool 12, primary concentration reverse osmosis device 13, primary concentrated liquid tank 14, secondary concentration reverse osmosis device 15, secondary concentrated liquid tank 16, and MVR evaporator 17 are connected in sequence through pipelines, the MVR evaporator 17 is connected to the hazardous waste treatment device, the high-density sedimentation tank 2 is connected to the sludge buffer tank 19 through a pipeline, the sludge buffer tank 19 is connected to the filter press 20 through a pipeline 23, and the high-salt sludge treated by the filter press 20 is transported out.

[0032] The high-density sedimentation tank 2 is doped with flocculants, coagulants, lime, soda ash and other substances that can reduce pollutants such as suspended matter, hardness, alkalinity, COD and the like in the water.

[0033] The high-density sedimentation tank 2 includes a mixing zone, a flocculation zone, and a sedimentation zone. It integrates the functions of coagulation, flocculation, sedimentation, and sludge concentration, and provides nuclei for the flocculation process by returning the sediment sludge, thereby ensuring that the floc particles are large and dense.

[0034] The sand filter 3 is filled with quartz sand filter material, magnetite filter material, porous ceramic filter material or manganese sand filter material for removing insoluble solid suspended matter and colloid in raw water. The purified water pool 4 is connected to the sand filter 3 through a pipeline 5.

[0035] The tubular filter 5 is provided with a filter cartridge, and the insoluble solid suspended matter and colloid remaining in the water after being filtered by the sand filter 3 are further removed through the interception and filtration effect of the filter cartridge.

[0036] The ultrafiltration device 9 is provided with a filter membrane, through which the macromolecular substances and microparticles of 0.001-0.02um such as proteins, water-soluble polymers, bacteria, etc. in the water filtered by the self-matching self-cleaning filter are retained and concentrated under pressure.

[0037] The weak acid bed 1 is filled with weak acid cation exchange resin for high-salt wastewater, and the carbonate hardness remaining in the ultrafiltration water is further removed through the softening effect of the weak acid cation exchange resin.

[0038] The primary concentration reverse osmosis device 13 is provided with a reverse osmosis membrane, which is used to filter and isolate impurities such as charged ions, inorganic salts, colloidal particles, bacteria and organic matter dissolved in the water filtered by the ultrafiltration device 9, so that high-concentration wastewater is concentrated into higher-concentration wastewater. The primary concentrated liquid is transported to the primary concentrated liquid tank 14 through a pipeline connection, and its fresh water is transported to the whole plant reuse water pool 21 through a pipeline connection.

[0039] The sludge buffer tank 19 is connected to the high-salt wastewater pool 1 through an overflow water pipe 22, and the filter press 20 is connected to the sludge buffer tank 19 through a pipe 24 to recover the filtrate of the filter press.

[0040] The primary concentration reverse osmosis device 13, the secondary concentration reverse osmosis device 15, and the MVR evaporator 17 are connected to the whole plant reuse water pool 21 through pipelines respectively.

[0041] The sand filter 3, the tubular microporous filter 5, the bag filter 8, and the ultrafiltration device 9 are connected to the high-salt wastewater pool 1 through pipeline three 27 respectively.

[0042] The ultrafiltration pool 10 is connected to the ultrafiltration device 9 through a pipe 26, so as to realize the requirement that the ultrafiltration device needs to use filtered water for backwashing in the ultrafiltration process.

[0043] The weak acid bed 11 is connected to the neutralization water tank 18 through a pipeline, and the neutralization water tank 18 is connected to the high-salt wastewater tank 1 through a pipeline 5 25. The ion exchanger regeneration wastewater is recovered, treated and reused.

[0044] The working principle of this utility model:

[0045] The high-salt wastewater pool 1 collects the initial wastewater and the equipment drainage generated during the wastewater treatment process. The high-density sedimentation tank 2 reduces the suspended solids, hardness, alkalinity, COD and other pollutants in the water by adding flocculants, coagulants, lime and soda ash. The high-density sedimentation tank 2 includes a mixing area, a flocculation area and a sedimentation area. It integrates the functions of coagulation, flocculation, sedimentation and sludge concentration, and provides a nucleus for the flocculation process through the reflux of the sedimentation sludge to ensure that the floc particles are large and dense. The water produced by the high-density sedimentation tank 2 flows by gravity to the downstream sand filter 3 through a pipeline connection. The sand filter 3 is filled with quartz sand filter material, magnetite filter material, porous ceramic filter material or manganese sand filter material and other filter materials to remove the insoluble solid suspended matter and colloids in the raw water, and flows by gravity into the purification pool 4 through a pipeline connection.

[0046] The purified water in the purified water tank 4 is pressurized by a water pump and transported to the downstream equipment through a pipeline. The insoluble solid suspended matter and colloids remaining in the water after being filtered by the sand filter tank 3 are further removed through the interception and filtration effect of the filter cartridge in the tubular filter 5. The produced water is transported to the filter water tank 6 through a pipeline.

[0047] The water in the filtered water tank 6 is lifted by a water pump and transported to the heater 7 and the bag filter 8 in sequence through a pipeline connection. The heating effect of the heater 7 and the interception and filtration effect of the filter bag in the bag filter 8 are beneficial to increase the flux value of the subsequent membrane element, remove crystals in the water that may be caused by the temperature increase, ensure that there are no solid impurities in the subsequent water flow, and avoid mechanical damage and pollution to the membrane elements of the downstream equipment; its produced water is transported to the ultrafiltration device 9 through a pipeline connection, and through the filtration effect of the filter membrane in the ultrafiltration device 9, the protein, water-soluble polymer, bacteria and other 0.001-0.02um macromolecular substances and microparticles in the water filtered by the self-matching self-cleaning filter are retained and concentrated under pressure, and transported to the ultrafiltration water pool 10 through a pipeline.

[0048] The ultrafiltration water in the ultrafiltration pool 10 is lifted by a water pump and transported to the weak acid bed 1 through a pipeline connection. The carbonate hardness remaining in the ultrafiltration water is further removed by the softening effect of the weak acid cation exchange resin specially used for high-salt wastewater in the weak acid bed 1, and then transported to the softening water pool 12 through a pipeline.

[0049] The softened water in the softened water pool 12 is lifted by a water pump and transported to the primary concentration reverse osmosis device 13 through a pipeline connection. The primary concentration reverse osmosis device 13 uses a reverse osmosis membrane to filter and isolate impurities such as charged ions, inorganic salts, colloidal particles, bacteria and organic matter dissolved in the water filtered by the ultrafiltration device 9, so that high-concentration wastewater is concentrated into higher-concentration wastewater. The primary concentrate is transported to the primary concentrate tank 14 through a pipeline connection, and its fresh water is transported to the whole plant reuse water pool 21 through a pipeline connection.

[0050] The primary concentrated liquid in the primary concentrated liquid tank 14 is lifted by a water pump and transported to the secondary concentrated reverse osmosis device 15 through a pipeline connection. The secondary concentrated reverse osmosis device 15 uses a reverse osmosis membrane to once again filter and isolate impurities such as charged ions, inorganic salts, colloidal particles, bacteria and organic matter dissolved in the concentrated liquid concentrated by the primary concentrated reverse osmosis device 13, so that the high-concentration wastewater can be concentrated to a higher multiple, thereby meeting the liquid inlet requirements of the MVR evaporator 17. The secondary concentrated liquid is transported to the secondary concentrated liquid tank 16 through a pipeline connection, and its fresh water is transported to the whole plant reuse water pool 21 through a pipeline connection.

[0051] The secondary concentrated liquid is lifted by a water pump and transported to the MVR evaporator 17 through a pipeline connection. The MVR evaporator 17 uses its own high-efficiency steam compressor to compress the secondary steam generated by evaporation, converts electrical energy into thermal energy, and increases the enthalpy of the secondary steam. The secondary steam with increased thermal energy is pumped into the evaporation chamber for heating, so as to achieve the recycling of the existing thermal energy of the secondary steam, thereby eliminating the need for external fresh steam and relying on the evaporator's self-circulation to achieve the purpose of evaporation and concentration. The system temperature, pressure, and motor speed are controlled by a PLC controller to maintain the evaporation balance of the system. The concentrated mother liquor is finally treated as hazardous waste, and the condensate is recovered to the whole plant reuse water pool 21.

[0052] In this embodiment, the backwash water and ultrafiltration concentrated water discharged from the sand filter 3, the tubular microporous filter 5, the bag filter 8, and the ultrafiltration device 9 are recovered to the high-salt wastewater pool 1 through a drainage ditch or a pipeline connection.

[0053] In this embodiment, part of the sludge in the high-density sedimentation tank 2 is returned to the high-density sedimentation tank 2 through the sludge pump pressurized pipeline, and the other part is transported to the sludge buffer tank 19 through the pipeline. The sludge in the sludge buffer tank 19 is transported to the filter press 20 through the sludge transport pump pipeline and discharged after dehydration by the filter press. The overflow water of the sludge buffer tank 19 is returned to the high-salt wastewater tank 1 through the overflow water pipeline.

[0054] In this embodiment, the regenerated wastewater of the weak acid bed 11 is recovered to the neutralization water tank 18 through pipelines such as drainage ditches, and after neutralization treatment, it is lifted by the neutralization water pump and transported to the high-salt wastewater tank 1 through pipeline five.

[0055] In the description of the present invention, the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "vertical", "horizontal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the purpose of describing the present invention rather than requiring the present invention to be constructed or operated in a specific position, and therefore cannot be understood as a limitation on the present invention. The terms "connected" and "connected" in the present invention should be understood in a broad sense, for example, it can be a connection or a detachable connection; it can be a direct connection or an indirect connection through an intermediate component. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0056] The above is a preferred embodiment of the present invention, and the description of the specific embodiment is only used to better understand the concept of the present invention. For ordinary technicians in this technical field, several improvements or equivalent substitutions can be made according to the principle of the present invention, and these improvements or equivalent substitutions are also considered to fall within the protection scope of the present invention.

Claims

1. A high-salinity wastewater treatment system, comprising a water pool, a filtering device, a heater, a concentration and reverse osmosis device, and an MVR evaporator, characterized in that: The water pool includes a high-salt wastewater pool, a sedimentation tank, a sand filter, a purified water pool, and a softened water pool. The filtering device includes a tubular microporous filter, a filter water tank, a bag filter, an ultrafiltration device, an ultrafiltration water pool, and a weak acid bed. The concentration and reverse osmosis device includes a primary concentration reverse osmosis device, a primary concentrate tank, a secondary concentration reverse osmosis device, and a secondary concentrate tank. The high-salt wastewater pool, the sedimentation tank, the sand filter, the purified water pool, the tubular microporous filter, the filter water tank, the heater, the bag filter, the ultrafiltration device, the ultrafiltration water pool, the weak acid bed, the soft The deionized water tank, the primary concentration reverse osmosis device, the primary concentrate tank, the secondary concentration reverse osmosis device, the secondary concentrate tank and the MVR evaporator are connected in series along the flow direction of the concentrated water through pipelines. The MVR evaporator is connected to the hazardous waste treatment device, the sedimentation tank is connected to the sludge buffer tank through pipelines, the sludge buffer tank is connected to the filter press through pipeline 1, and the high-salt sludge treated by the filter press is transported out; the primary concentration reverse osmosis device, the secondary concentration reverse osmosis device and the MVR evaporator are connected to the reuse water tank of the whole plant through pipelines.

2. The high-salinity wastewater treatment system according to claim 1, characterized in that: The sludge buffer tank is connected to the high-salt wastewater pool through an overflow water pipeline, and the filter press is connected to the sludge buffer tank through pipeline 2.

3. The high-salt wastewater treatment system according to claim 1, characterized in that: The sand filter, tubular microporous filter, bag filter and ultrafiltration device are respectively connected to the high-salt wastewater pool through pipeline three.

4. The high-salinity wastewater treatment system according to claim 1, characterized in that: The ultrafiltration pool is connected to the ultrafiltration device through pipeline four.

5. The high-salinity wastewater treatment system according to claim 1, characterized in that: The weak acid bed is connected to the neutralization water tank through a pipeline, and the neutralization water tank is connected to the high-salt wastewater tank through pipeline five.

6. The high-salinity wastewater treatment system according to claim 1, characterized in that: The sedimentation tank is a high-density sedimentation tank, into which substances capable of reducing suspended matter, hardness, alkalinity, and COD pollutants in water are added.

7. The high-salinity wastewater treatment system according to claim 6, characterized in that: The high-density sedimentation tank includes a mixing zone, a flocculation zone, and a sedimentation zone.

8. The high-salinity wastewater treatment system according to claim 1, characterized in that: The sand filter tank is filled with quartz sand filter material, magnetite filter material, porous ceramic filter material or manganese sand filter material for removing insoluble solid suspended matter and colloid in raw water.

9. The high-salinity wastewater treatment system according to claim 1, characterized in that: The weak acid bed is filled with weak acid cation exchange resin for high-salt wastewater.

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