CN217479251U - Phosphate waste water zero release processing system - Google Patents
Phosphate waste water zero release processing system Download PDFInfo
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- CN217479251U CN217479251U CN202220968838.XU CN202220968838U CN217479251U CN 217479251 U CN217479251 U CN 217479251U CN 202220968838 U CN202220968838 U CN 202220968838U CN 217479251 U CN217479251 U CN 217479251U
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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Abstract
The utility model discloses a phosphate wastewater zero discharge treatment system, which comprises a raw water pool, a pH adjusting device, a sedimentation tank, a sedimentation filter, a clarification tank and a multi-medium filter which are connected in sequence; the output end of the multi-medium filter is connected with a resin softener; a resin softener; the output end of the resin softener is connected with a softening water tank; the output end of the softening water tank is connected with an ultrafiltration device; the output end of the ultrafiltration device is connected with an ultrafiltration water generating tank; the output end of the ultrafiltration water producing tank is connected with an R0 device, and the output end of the R0 device is respectively connected with a concentrated/fresh water tank and an R0 water producing tank; the output end of the concentrated/fresh water pool is connected with an ED device; the output end of the ED device is connected with an ED fresh water pool and an ED concentrated water pool respectively; the ED concentrated water tank is connected with an MVR device; the utility model discloses the industrial production's that has significantly reduced water consumption, very big water resource that alleviates is deficient and solves environmental pollution's problem, conveniently retrieves solid by-product simultaneously.
Description
Technical Field
The utility model relates to the technical field of wastewater treatment, in particular to a phosphate wastewater zero discharge treatment system.
Background
The phosphate wastewater refers to wastewater with the total content of at least 2 percent by mass. It mainly comes from wood activated carbon production enterprises. If the phosphate wastewater generated in the production process of wood activated carbon production enterprises is directly discharged, the environment can be polluted; if the waste water is recycled, the technical difficulty is very high, and no formed waste water zero-discharge treatment process exists in the prior art.
Zero discharge means that the wastewater generated in the process production process can be recycled after being treated, and no waste liquid is discharged out of a factory. The salt substances in the water are changed into solid after concentration, evaporation and crystallization treatment or are recycled as chemical raw materials. The wastewater zero discharge technology has the advantages of reducing water consumption, fully utilizing resources, saving cost, reducing environmental pollution and the like, and has obvious social, economic and environmental benefits.
The advantages of zero emission are as follows:
1. 90 to 99 percent of water can be recovered from the discharged sewage and reused for industrial production.
2. Greatly reduces the water consumption of industrial production and greatly relieves the problem of water resource shortage.
3. The problem of environmental pollution is thoroughly solved.
4. Recovering the solid by-product.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a phosphate waste water zero discharge treatment system aiming at the defects of the prior art so as to solve the problems in the background art.
The utility model discloses a following technical scheme realizes:
a phosphate wastewater zero-discharge treatment system comprises a raw water tank, a pH adjusting device, a sedimentation tank and a sedimentation filter; the output end of the raw water tank is connected with the pH adjusting device, and the raw water with the pH adjusted enters a sedimentation tank for sedimentation; the output end of the sedimentation tank is connected with the sedimentation filter; the output end of the sedimentation filter is connected with a clarification tank; the output end of the clarification tank is connected with a multi-media filter; the output end of the multi-medium filter is connected with a resin softener; the output end of the resin softener is connected with a softening water tank; the output end of the softening water tank is connected with an ultrafiltration device; the output end of the ultrafiltration device is connected with an ultrafiltration water generating tank; the output end of the ultrafiltration water producing tank is connected with an R0 device, and the output end of the R0 device is respectively connected with a concentrated/fresh water tank and an R0 water producing tank; the output end of the concentrated/fresh water pool is connected with an ED device; the output end of the ED device is connected with an ED fresh water pool and an ED concentrated water pool respectively; the ED concentrated water tank is connected with an MVR device.
Further, the pH adjusting device is a PE plastic barrel, and the pH value of the liquid is adjusted by adopting a mode of adding a medicament on line by a metering pump according to the pH feedback condition of the feed liquid.
Further, the sedimentation filter is a plate-frame filter and is operated in a pressure mode.
Further, the backwashing water of the multi-medium filter, the regenerated water of the resin softener and the backwashing water are returned to the sedimentation tank through pipelines.
Further, the concentrated water/backwash water of the ultrafiltration device is returned to the sedimentation tank through a pipeline.
Further, the R0 device is a reverse osmosis device used for removing most ions in water by a membrane separation technology.
Further, the ED device is a treatment device for electrodialysis, and is used for selective permeability of anion and cation exchange membranes to anions and cations in a solution under the action of a direct current electric field.
Further, the MVR device is used to evaporate the solution.
Further, the output end of the ED fresh water pool is connected with the ultrafiltration water production pool.
The utility model has the advantages that:
compared with the prior art, the utility model discloses a phosphate waste water zero release processing system adopts membrane separation technique + ED technique to separate the phosphate from waste water, and dense water finally obtains solid powder by one section next process MVR evaporation, realizes the waste water zero release, and concrete technical scheme comprises pretreatment systems, ultrafiltration system, ED system, RO system, and water treatment total amount 600m 3 The final water output of the sewage treatment station is 500m3/d reuse water (phosphate radical content)<100mg/l)、100m 3 Concentrated brine of/d (phosphate radical content)>90 g/l). The reclaimed water after treatment can be reused in the production lineOn, the concentrated water obtains solid powder after the evaporation, guarantees that this system can retrieve 90% -99% water from the sewage that discharges, recycles to industrial production, and the water consumption that has significantly reduced industrial production, very big release water resource deficient and solve environmental pollution's problem conveniently retrieve the solid by-product simultaneously.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic view of a continuous fluid separation system of the present invention;
FIG. 2 is a water quality meter for water intake in an embodiment of the present invention;
figure 3 is a water quality meter of the embodiment of the utility model.
In the drawings: 1-a raw water pool; 2-a pH adjusting device; 3-a sedimentation tank; 4-a sedimentation filter; 5-a clarification tank; 6-a multi-media filter; 7-a resin softener; 8-softening the water tank; 9-an ultrafiltration device; 10-ultrafiltration water producing tank; 11-R0 devices; 12-R0 water producing pool; 13-dense/fresh water pool; 14-ED means; 15-ED concentrated water pool; 16-ED fresh water pool; 17-MVR device.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "vertical", "upper", "lower", "horizontal", etc. are directions or positional relationships based on the drawings, and are only for convenience of description of the present invention and simplification of description, but not for indicating or implying that the indicated device or element must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should be further noted that, unless otherwise specified or limited, the terms "disposed," "installed," "connected" and "connected" should be understood broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, or connected through an intermediate medium, and can communicate between the inside of two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
As shown in fig. 1, a phosphate wastewater zero-discharge treatment system comprises a raw water tank 1, a pH adjusting device 2, a sedimentation tank 3 and a sedimentation filter 4; the output end of the raw water tank 1 is connected with the pH adjusting device 2, and the raw water with the adjusted pH enters a sedimentation tank 3 for sedimentation; the output end of the sedimentation tank 3 is connected with a sedimentation filter 4; the output end of the sedimentation filter 4 is connected with a clarification tank 5; the output end of the clarification tank 5 is connected with a multi-media filter 6; the output end of the multi-medium filter 6 is connected with a resin softener 7; the output end of the resin softener 7 is connected with a softening water tank 8; the output end of the softened water tank 8 is connected with an ultrafiltration device 9; the output end of the ultrafiltration device 9 is connected with an ultrafiltration water generating tank 10; the output end of the ultrafiltration water producing pool 10 is connected with an R0 device 11, and the output end of the R0 device 11 is respectively connected with a concentrated/fresh water pool 13 and an R0 water producing pool 12; the output end of the concentrated/fresh water pool 13 is connected with an ED device 14; the output end of the ED device 14 is respectively connected with an ED fresh water pool 16 and an ED concentrated water pool 15; the output end of the ED fresh water pool 16 is connected with the ultrafiltration water generating pool 10; the ED concentrated water tank 15 is connected with an MVR device 17.
The phosphate wastewater zero-discharge treatment system of the utility model adopts the membrane separation technology and the ED technology to separate phosphateSeparating out from the wastewater, evaporating the concentrated water by the MVR in the next step to obtain solid powder to realize zero discharge of the wastewater, wherein the specific technical scheme comprises a pretreatment system, an ultrafiltration system, an ED system and an RO system, and the total water treatment amount is 600m 3 The final water output of the sewage treatment station is 500m3/d reuse water (phosphate radical content)<100mg/l)、100m 3 Concentrated brine of/d (phosphate radical content)>90 g/l). The reclaimed water after the treatment can be reused on a production line, the concentrated water is evaporated to obtain solid powder, the system is ensured to recover 90-99% of water from the discharged sewage and reuse the water for industrial production, the water consumption of the industrial production is greatly reduced, the problems of water resource shortage and environmental pollution are greatly relieved, and meanwhile, solid byproducts are conveniently recovered.
Specifically, in the embodiment, the pH adjusting device 2 is a PE plastic barrel, and adjusts the pH value of the liquid by adding a reagent on line by a metering pump according to the pH feedback condition of the feed liquid.
Specifically, in the embodiment, the sedimentation filter 4 is a plate-and-frame filter and is operated under pressure.
Specifically, in the present embodiment, the backwash water of the multimedia filter 6, the regeneration water of the resin softener 7, and the backwash water are returned to the sedimentation tank 3 through pipes.
It should be noted that the multi-media filter 6 is a steel cylindrical tank body, adopts quartz sand as a filter medium, and operates in a pressure mode; in the whole treatment project, the distribution gradient of the gaps with small top and big bottom of an ideal filter material is met, the efficiency is high, the filtering speed can reach 8-10 m, the sewage interception capacity is large, the multi-medium filter 6 can achieve the filtering effect, and the method is widely applied to construction and transformation of sewage stations.
The multi-media filter 6 is connected with the sedimentation tank 3 through filter backwashing equipment; the pretreatment mainly aims to remove suspended matters, colloid, manganese ions, iron ions, organic matters and other impurities which obstruct the subsequent reverse osmosis operation in raw water. The treatment facilities comprise a sedimentation water outlet tank, a raw water pump, a multi-media filter, a filter backwashing device and the like.
The resin softener 7 mainly aims at further reducing the content of calcium and magnesium ions in the feed liquid and preventing the subsequent feed liquid from generating precipitation after high-power concentration;
specifically, in the embodiment of the present invention, the concentrate/backwash water of the ultrafiltration device 9 is returned to the sedimentation tank 3 through a pipeline. The ultrafiltration device 9 is formed by an ultrafiltration membrane separation technology, and the ultrafiltration membrane separation technology has the characteristics of small floor area, good effluent quality, high automation level and the like. Membrane separation techniques are a general term for a broad class of techniques. The water treatment mainly comprises micro-filtration, ultra-filtration, nano-filtration, reverse osmosis and the like. The membrane separation products all utilize the interception capability of a specially manufactured porous material to remove impurities with certain particle size in water in a physical interception mode. The filtration precision is related to the pore size of the filter membrane. Ultrafiltration can remove viruses, macromolecular substances, colloids, and the like. According to the practical engineering experience, if ultrafiltration protection is not provided, electrodialysis is easily affected by bacteria/macromolecular organic matters and partial flocculated substances, finally the electrodialysis pollution risk is aggravated, and in severe cases, the membrane flux is reduced, so that online cleaning cannot be performed.
Specifically, in this embodiment, the R0 apparatus 11 is a reverse osmosis apparatus for removing most of the ions in water by using a membrane separation technology. The R0 device 11 is a reverse osmosis device which is used for removing most of ions in water by a membrane separation technology, and one end of the R0 device 11 is connected with a dense-dilute water pool; the R0 device 11 belongs to a key device in a desalting system, and the device removes most of ions, SiO2 and the like in water by utilizing a membrane separation technology, thereby greatly reducing TDS. RO is that a part of raw water passes through the membrane along the direction vertical to the membrane, salts and colloidal substances in the water are concentrated on the surface of the membrane, and the rest of raw water takes away the concentrated substances along the direction parallel to the membrane, so that the membrane is self-cleaned in the operation process. The greater the water flux of the membrane element, the higher the recovery rate, the higher the concentration of the membrane surface, and due to the concentration effect, the solubility of substances at the membrane surface is different from the concentration of substances in the main water flow, and a concentration polarization phenomenon occurs. Concentration polarization causes high concentration of salt on the membrane surface, increases osmotic pressure of the membrane, causes salt transmittance to increase, needs more energy consumption for increasing the pressure of feed water, and adopts a cleaning method for recovery
Specifically, in this embodiment, the ED device 14 is an electrodialysis treatment device, and is used for selective permeability of anion and cation exchange membranes to anions and cations in a solution under the action of a dc electric field. Electrodialysis is an electrochemical separation process that utilizes the migration of ions in a direct current electric field, and is widely used for desalination of systems. Electrodialysis is a physical and chemical process for separating ionic solutes from solvents in a solution by using the selective permeability of anion and cation exchange membranes to anions and cations in the solution under the action of a direct current electric field.
The electrodialysis adopts a patent product which is independently researched and developed, namely an impregnation method homogeneous membrane, and compared with the traditional heterogeneous membrane, the electrodialysis has lower resistance and is top in the industry in terms of current efficiency and selective permeability. The impregnation method homogeneous membrane has high selective permeability which is more than or equal to 95 percent; good conductivity, large exchange capacity, proper swelling rate and water content, strong mechanical property, acid and alkali resistance and pollution resistance, and can be cleaned on line or off line. Under normal use, the service life can reach 5 years.
Specifically, in this embodiment, the MVR device 17 is used to evaporate the solution. The concentrated water may be evaporated using the process MVR device 17 to obtain a solid powder.
In conclusion, the wastewater firstly enters a pretreatment system, and the pretreatment mainly aims at removing impurities which are in the raw water and hinder the subsequent reverse osmosis operation, such as suspended matters, colloids, manganese ions, iron ions, organic matters and the like. The treatment facilities comprise a sedimentation water outlet tank, a raw water pump, a multi-media filter, a filter backwashing device and the like.
The wastewater treated by the pretreatment system enters a multi-media filter 6, the multi-media filter is a steel cylindrical tank body, quartz sand is used as a filter medium, and the multi-media filter operates in a pressure mode. In the whole treatment project, the filter material meets the ideal gap distribution gradient of small upper part and large lower part of the filter material, the efficiency is high, the filtering speed can reach 8-10 m, the sewage interception capacity is large, and the multi-medium filter 6 can achieve the security effect and can be widely applied to the construction and the reconstruction of a sewage station. The treated water amount is 30m3/h, and the outlet water ensures that NTU meets the water inlet requirement.
The effluent of the multi-media filter 6 enters a resin softener 7, and the main purpose is to further reduce the content of calcium and magnesium ions in the feed liquid and ensure the water quality requirement of subsequent advanced treatment;
the water produced by the resin softener 7 enters an ultrafiltration membrane system. Ultrafiltration can remove viruses, macromolecular substances, colloids, etc. The type selection of the ultrafiltration membrane element selects a membrane with large water permeability, good chemical stability, good pollution resistance and good mechanical strength according to the characteristics of water quality. The ultrafiltration membrane is made of PVDF material, and has strong anti-fouling capability, good chemical stability and good mechanical strength. The pipeline of the ultrafiltration device 9 body is a UPVC pipe. The pipeline and valve in the ultrafiltration device 9 body adopt UPVC pipeline and valve, the UPVC pipeline and valve are chemical grade, 1.6 MPa. The service life of the film is more than 3 years. In any period within 3 years, the net output reaches a guaranteed value SDI less than or equal to 3. The pipeline design velocity of flow is 1.5 ~ 2.5m/s to reduce the pressure loss through the system, actual operation flux: 40 LMH. The ultrafiltration device 9 is arranged on the skid-mounted frame, the membrane elements are arranged in parallel, and a valve is arranged on each row of inlet and outlet water main pipes so as to be connected with the cleaning fluid inlet and outlet pipes during cleaning. The product water pipe, the water inlet pipe and the water outlet pipe of each ultrafiltration membrane component are provided with sampling points and necessary detection meters, and the quantity and the position can effectively supervise, diagnose and determine the defects of the system. All pipelines and joints are arranged on the frame, all brackets, fasteners, clamps and the like are included, and the frame is designed to meet the local seismic intensity. The ultrafiltration membrane module frame is provided with a leak detection device to detect the operation condition of the membrane element. And setting DCS to control full-automatic operation. The water yield of the system can meet the operation requirements of various ED working conditions. If a single membrane core goes out the problem, can cut off single row valve and change alone, do not influence the operation of other membrane cores.
And (4) performing advanced treatment desalination on the ultrafiltration effluent. The advanced treatment desalination unit mainly adopts a reverse osmosis + ED process to remove soluble solids and other substances in water, so that the produced water can meet the water requirements of reuse water. In the electrodialysis unit, when phosphate wastewater passes through an electrodialysis compartment formed by alternately stacking anion and cation exchange membranes and concentrated and fresh water separators and arranging electrodes at two ends, directional ion migration is generated under the action of a direct current electric field, namely cations migrate towards the direction of a cathode and anions migrate towards the direction of an anodeMigration, wherein the ion exchange membrane has selective permeability, the anion exchange membrane can only allow anions to pass through, and the cation exchange membrane can only allow cations to pass through, so that the anions in the fresh water chamber migrate towards the anode direction and enter the concentrated water chamber through the cathode membrane, and the cations migrate towards the cathode direction and enter the concentrated water chamber through the anode membrane; although the negative ions and the positive ions in the concentrated water chamber respectively migrate towards the anode and the cathode under the action of the direct current electric field, the negative ions and the positive ions cannot migrate out of the concentrated water chamber due to the blocking of the positive membranes and the negative membranes on the two sides of the compartment, and are remained in the concentrated water chamber, so that the concentration of the concentrated water chamber is improved due to the continuous entering of the negative ions and the positive ions, the concentration of the fresh water chamber is reduced due to the continuous moving of the negative ions and the positive ions, and the water flows of the concentrated compartments and the fresh water chambers are respectively converged and led out through special holes on the edge of the partition plate, so that two main water flows, namely desalted water and concentrated brine are generated. The number of electrodialysis co-arranged membrane stacks is as follows: 6 briquetting, can handle the water yield: 34m 3 H is used as the reference value. Considering the time of membrane washing or maintenance required at ordinary times, the whole ED system is designed according to the working time of 23h per day, and the total water inlet amount is 800m 3 D, wherein the final concentrate amount is 500m 3 /d；
The concentrated brine after the electrodialysis treatment contains a large amount of phosphate radicals, and white solid powder is obtained after the waste water is evaporated by MVR. The desalted water enters a reverse osmosis system to be continuously filtered to prepare the production reuse water.
Referring to fig. 2 and 3, the reverse osmosis membrane element is selected according to the water quality characteristics of circulating water, and a membrane with large water permeability, high desalination rate, good chemical stability, good pollution resistance and good mechanical strength is selected, and the membrane element is an enhanced low-pressure pollution high-desalination composite membrane of DOW company. Considering the time required for membrane cleaning or maintenance at ordinary times, the reverse osmosis membrane bioreactor is designed according to the working time of 23 hours per day, and the total water yield of reverse osmosis is 500m 3 The water yield was 69%, and the membrane flux was 12.75 LMH.
The technical solutions provided by the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by using specific examples, and the descriptions of the above embodiments are only applicable to help understand the principles of the embodiments of the present invention; meanwhile, for a person skilled in the art, according to the embodiments of the present invention, there may be variations in the specific implementation manners and application ranges, and in summary, the contents of the present specification should not be construed as limitations of the present invention.
Claims (9)
1. The utility model provides a phosphate waste water zero release processing system which characterized in that: comprises a raw water tank, a pH adjusting device, a sedimentation tank and a sedimentation filter; the output end of the raw water tank is connected with the pH adjusting device, and the raw water after pH adjustment enters a sedimentation tank for sedimentation; the output end of the sedimentation tank is connected with the sedimentation filter; the output end of the sedimentation filter is connected with a clarification tank; the output end of the clarification tank is connected with a multi-media filter; the output end of the multi-medium filter is connected with a resin softener; the output end of the resin softener is connected with a softening water tank; the output end of the softening water tank is connected with an ultrafiltration device; the output end of the ultrafiltration device is connected with an ultrafiltration water generating tank; the output end of the ultrafiltration water producing tank is connected with an R0 device, and the output end of the R0 device is respectively connected with a concentrated/fresh water tank and an R0 water producing tank; the output end of the concentrated/fresh water pool is connected with an ED device; the output end of the ED device is connected with an ED fresh water pool and an ED concentrated water pool respectively; the ED concentrated water tank is connected with an MVR device.
2. The phosphate wastewater zero-discharge treatment system according to claim 1, characterized in that: the pH adjusting device is a PE plastic barrel, and the pH value of the liquid is adjusted by adopting a mode of adding a medicament on line by a metering pump according to the feedback condition of the pH of the feed liquid.
3. The phosphate wastewater zero-discharge treatment system according to claim 1, characterized in that: the sedimentation filter is a plate-frame filter and is operated in a pressure mode.
4. The phosphate wastewater zero-discharge treatment system according to claim 1, characterized in that: and the backwashing water of the multi-medium filter, the regenerated water of the resin softener and the backwashing water are returned to the sedimentation tank through pipelines.
5. The phosphate wastewater zero-discharge treatment system according to claim 1, characterized in that: and the concentrated water/backwashing water of the ultrafiltration device returns to the sedimentation tank through a pipeline.
6. The phosphate wastewater zero-discharge treatment system according to claim 1, characterized in that: the R0 device is a reverse osmosis device and is used for removing most ions in water by a membrane separation technology.
7. The phosphate wastewater zero discharge treatment system according to claim 1, characterized in that: the ED device is an electrodialysis treatment device and is used for the selective permeability of anion and cation exchange membranes to anions and cations in a solution under the action of a direct current electric field.
8. The phosphate wastewater zero-discharge treatment system according to claim 1, characterized in that: the MVR device is used to evaporate the solution.
9. The phosphate wastewater zero discharge treatment system according to claim 1, characterized in that: and the output end of the ED fresh water tank is connected with the ultrafiltration water production tank.
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| CN202220968838.XU CN217479251U (en) | 2022-04-25 | 2022-04-25 | Phosphate waste water zero release processing system |
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| CN202220968838.XU CN217479251U (en) | 2022-04-25 | 2022-04-25 | Phosphate waste water zero release processing system |
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Address after: 361101 room 3152, Xuanye building, entrepreneurship Park, torch high tech Zone, Xiamen, Fujian Patentee after: Xiamen Shida Membrane Environmental Protection Technology Co.,Ltd. Address before: 361101 room 3152, Xuanye building, entrepreneurship Park, torch high tech Zone, Xiamen, Fujian Patentee before: Xiamen Shida membrane Engineering Co.,Ltd. |
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