CN115465991A - Iron phosphate mother liquor wastewater treatment method and system - Google Patents
Iron phosphate mother liquor wastewater treatment method and system Download PDFInfo
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Abstract
The invention relates to a method and a system for treating iron phosphate mother liquor wastewater, wherein the method comprises the steps of respectively introducing two streams of mother liquor water into two water collecting tanks, mixing the mother liquor water with different water qualities, and controlling the ratio of polyvalent metal ions to phosphorus content in the mother liquor water to be within a range from Mg: P =1 to 2.6-3, mn: P =1 to 2.2, fe: P = 1.1, and the water quality phosphorus content is the sum of the ion ratios; at the moment, chemical precipitation is carried out to remove polyvalent metal ions in the mixed mother liquor wastewater, and the generated precipitate can be recycled as slow release fertilizer and phosphorus resources after being dehydrated, so that the produced water can be recycled. The invention separately collects the mother liquor wastewater according to the water quality, respectively controls the flow rate, and adjusts the content ratio of metal ions and phosphorus in the mixed sedimentation tank, so that the effect of precipitating the metal ions in the pretreatment process is better, the scaling of pipelines and water pump impellers and the pollution and blockage of reverse osmosis membrane devices are reduced or avoided, the floor area of the water tank is reduced, and the phosphorus resource is fully utilized.
Description
Technical Field
The invention belongs to the technical field of industrial wastewater treatment, and relates to a method and a system for treating iron phosphate mother liquor wastewater.
Background
The ferric phosphate mother liquor wastewater is residual high-salt wastewater after separation and precipitation in the ferric phosphate synthesis process, the mother liquor wastewater has two streams with different water quality, and the two streams comprise a saturated solution separated from a synthetic mother liquor, namely raw material synthesis in the ferric phosphate production process, and an aging mother liquor, namely a saturated solution separated from synthesized heterogeneous ferric phosphate after a constant-temperature aging process.
The existing iron phosphate mother liquor wastewater treatment methods are divided into a lime precipitation method, a magnesium salt treatment method and a membrane treatment method: (1) The lime precipitation method comprises the steps of adding a large amount of lime into the wastewater, directly discharging the supernatant without considering the standard exceeding of total salt, generating a large amount of sludge which is difficult to treat, and not considering the discharge and treatment of the salt; (2) Blowing off high-concentration ammonia nitrogen and precipitating magnesium ammonium phosphate, namely adding magnesium oxide and magnesium hydroxide into the wastewater to generate magnesium ammonium phosphate (struvite); the residual ammonia gas is stripped and absorbed by sulfuric acid to generate ammonium sulfate, but the method has high treatment cost, the wastewater is difficult to discharge after reaching the standard, a subsequent membrane treatment system with over-high magnesium content is difficult to treat, and the pipelines of the system are easy to scale; (3) A membrane treatment method, namely, mother liquor pretreatment is carried out to convert most polyvalent metal ions and phosphorus in the mother liquor into precipitate, solid-liquid separation is carried out on the generated solid-liquid mixture, and clear mother liquor is output; separating clear mother liquor to remove most of particulate matters and polyvalent metal ions in the clear mother liquor and outputting low-salt mother liquor; and then the water is concentrated by a two-stage membrane and output to a terminal to produce water.
Traditional mother liquor pretreatment methods is directly to introduce the equalizing basin with two strands of waste waters of mother liquor, most polyvalent metal ion and phosphorus in messenger's mother liquor turn into the sediment and carry out solid-liquid separation to the solid-liquid mixture who generates, because synthetic mother liquor that produces in the anhydrous ferric phosphate production process is all inequality with ageing mother liquor quality of water and water yield, lead to the effect that the equalizing basin area needs very big play the homogeneity water, the equalizing basin volume is little, the mother liquor treatment effect after the mixture is not good, metal ion is difficult to deposit, and when workshop quality of water changes, easily cause the influence that is difficult to resume to water processing system, for example: the scale of the lift pump and the pipeline causes serious pollution and blockage of the membrane system.
Patent No. 202111617465.8 discloses a method and a system for treating iron phosphate wastewater, wherein the method comprises the following steps: s1, pretreating a ferric phosphate mother solution to obtain a mother solution clear filtrate, and pretreating ferric phosphate washing water to obtain concentrated water A; s2, mixing the mother liquor clear filtrate with concentrated water A, and then evaporating and concentrating to obtain concentrated water B; s3, centrifuging the concentrated water B, cooling and crystallizing to obtain a solid product, and drying. The processing system comprises: the first pretreatment device is used for pretreating the ferric phosphate mother liquor to obtain mother liquor clarified filtrate; the second pretreatment device is used for pretreating the iron phosphate washing water to obtain concentrated water A; the evaporation concentration device is respectively communicated with the first pretreatment device and the second pretreatment device and is used for carrying out evaporation concentration on the mother liquor clarified filtrate and the concentrated water A to obtain concentrated water B; the centrifugal device is communicated with the evaporation concentration device and is used for centrifuging the concentrated water B; the cooling crystallization device is communicated with the centrifugal device and is used for cooling and crystallizing the centrifuged product; and the drying device is respectively communicated with the centrifugal device and the cooling crystallization device and is used for drying the products after centrifugation and cooling crystallization. According to the technical scheme, the iron phosphate production wastewater is respectively treated according to the characteristics, and concentrated water after evaporation and concentration is subjected to centrifugation, cooling crystallization, drying and other operations, so that ammonium sulfate, ammonium hydrogen phosphate, magnesium sulfate and pure water in the wastewater are recycled, and the purposes of resource recovery and zero emission are achieved. In the technical scheme, the ferric phosphate production mother liquor is divided into synthesis mother liquor and aging mother liquor, wherein the magnesium ion content in the synthesis mother liquor is 300-800ppm, the iron ion content is about 100ppm, the manganese ion content is about 100-150ppm, and the phosphorus content is 100ppm; the aged mother liquor contains less impurity ions and phosphorus content is about 1500-2000ppm, two mother liquors are directly mixed for pretreatment in the patent No. 202111617465.8, and due to the fact that the water quality and water quantity of the two mother liquors are different, the precipitation multivalent metal ions in the pretreatment mainly depend on a phosphorus source, and the phosphorus in water bodies in different time periods is insufficient, so that the magnesium and manganese content in the whole system is high, scaling of impellers of pipelines and water pumps is difficult to clean, oxidation can be generated on a reverse osmosis membrane, the treatment capacity of the system is reduced, operation and maintenance labor and material cost are increased, and irreversible damage can be generated on the reverse osmosis membrane due to overhigh manganese ions.
In 202210433515.5, a comprehensive treatment method for wastewater generated in iron phosphate production is disclosed, which comprises the following steps: (S1) washing water treatment: (S2) mother liquor treatment: A. removing fluorine; B. removing phosphorus; C. removing manganese; D. producing a byproduct calcium sulfate; E. removing calcium and magnesium; F. removing ammonia; G. and (6) circulating. According to the technical scheme, zero discharge of the iron phosphate wastewater is realized through process optimization, and the iron phosphate wastewater is separated and recovered in a grading manner according to different properties of various impurities, so that the resources are recovered to the maximum extent; by removing the fluoride ions in the wastewater in the early stage, a high-quality iron phosphate byproduct can be obtained, and then manganese dioxide and calcium sulfate are respectively obtained, so that new impurities are not introduced while the resources are recycled, and the method is slightly surplus through cost benefit accounting, and is a wastewater comprehensive treatment method with high economic value. In the technical scheme, calcium hydroxide is used for adjusting the pH value in the stage D, the pH value needs to be adjusted to 11-12, the iron phosphate wastewater belongs to high ammonia nitrogen wastewater, ammonia water is used for adjusting the pH value in the stage A and the stage B to introduce ammonium ions, when the pH value is adjusted to 11-12, ammonium radicals are converted into ammonia gas in high alkalinity water quality and are easy to diffuse, the ammonia concentration in the air is high in the stage D of treatment, potential safety hazards exist, when the product calcium sulfate sludge is filtered and solidified, the ammonia gas volatilizes during drying and dehydration, the operation process cannot avoid manual operation, and the risk of ammonia poisoning exists; meanwhile, the flow of the mother liquor pretreatment process is long, the content of polyvalent metal ions in water is limited, and the pretreatment agent and the operation energy consumption are high and the labor cost is high.
In view of this, how to treat the ferric phosphate mother liquor wastewater more optimally is a direction of research and development.
Disclosure of Invention
In order to solve the technical problems, the invention provides a ferric phosphate mother liquor wastewater treatment method and a ferric phosphate mother liquor wastewater treatment system, which have good pretreatment effect, can ensure that a sewage treatment system is not influenced even if the water quality of a workshop changes, and can furthest avoid the scaling condition of pipelines and water pump impellers and the fouling condition of a membrane system during the operation and maintenance of the sewage treatment system.
The invention is realized by the following technical scheme:
the method for treating the iron phosphate mother liquor wastewater comprises the steps of respectively introducing two strands of mother liquor water into two water collecting tanks, controlling the water outlet amount of the two water collecting tanks, mixing the mother liquor water with different water quality, and controlling the content ratio of polyvalent metal ions to phosphorus in the mother liquor water to be Mg: P =1:2.6-3, mn: P = 1-2.2, fe: P = 1.1, and the water quality phosphorus content is the sum of the ion ratios, at this time, chemical precipitation is carried out to remove polyvalent metal ions in the mixed mother liquor wastewater, the polyvalent metal ions are reduced to below 5ppm, and the generated precipitate is dehydrated and then recycled as slow release fertilizer and phosphorus resource, and the produced water is recycled.
The method for treating the iron phosphate mother liquor wastewater specifically comprises the following steps:
the first step is as follows: respectively collecting mother liquor water in an anhydrous iron phosphate production workshop according to different water qualities;
the second step is that: introducing two mother liquor waters into a primary mixing reaction tank, controlling the flow of the two mother liquor waters, controlling the ratio of metal ion content to phosphorus content in the two mother liquor waters to flow into the primary mixing reaction tank in a mixing manner within the range of Mg: P = 1;
the third step: carrying out mud-water separation on the mud-water mixed liquid in the primary mixing reaction tank, carrying out plate-frame pressing, and dehydrating and drying the generated sludge to be recovered as a slow-release phosphate fertilizer;
the fourth step: lifting the filtered clear liquid in the third step to a secondary mixed reaction tank, adding ammonia water, controlling the pH value to be 8.5 to 9.0, and keeping the hydraulic power for 15 to 30min to remove the rest metal ions;
the fifth step: carrying out mud-water separation on the mud-water mixed liquid in the secondary mixing reaction tank, carrying out plate-frame pressing, and dehydrating and drying the generated sludge, wherein the component is mainly magnesium ammonium phosphate which can be recovered as a slow release fertilizer; filtering the clear liquid to enter a mother liquid middle water pool;
and a sixth step: water in a water tank in the mother liquor enters a tubular microfiltration cycle, the produced water enters the next step, and concentrated water continues to be subjected to the tubular microfiltration cycle;
the seventh step: concentrating the produced water in the sixth step by using a reverse osmosis membrane, and taking the produced water as reuse water;
the eighth step: and seventhly, carrying out MVR evaporation concentration on the concentrated water with high salt content, and centrifuging the concentrated crystallization mixed solution for separating salt when the density reaches 1.38 to 1.42g/cm for carrying out thin film evaporation, wherein the salt product is ammonium sulfate.
The method for treating the iron phosphate mother liquor wastewater comprises the following steps: in the sixth step, concentrated water is circulated through a tubular microfiltration machine, ammonia is added for precipitation, the mud-water mixture is subjected to mud-water separation plate frame squeezing, and the filtered clear liquid returns to the tubular microfiltration machine.
The iron phosphate mother liquor wastewater treatment system comprises a mother liquor collecting tank, a primary pretreatment system, a secondary pretreatment system, a mother liquor middle water tank, a tubular microfiltration system, a reverse osmosis membrane device, an MVR evaporation device, a centrifugal machine and a paddle dryer; the mother liquor collecting tank comprises a synthetic mother liquor collecting tank and an aging mother liquor collecting tank; the primary treatment system comprises a primary mixed reaction tank, a primary diaphragm plate-and-frame filter press and a primary filtrate collecting tank; the primary mixing reaction tank is used for mixing the synthetic mother liquor and the aging mother liquor and comprises a water inlet pipeline and a water outlet pipeline; the water inlet pipeline comprises a main pipeline, a first branch and a second branch which are respectively connected with the synthetic mother liquor collecting tank and the aging mother liquor collecting tank; the inlet of the primary membrane plate-and-frame filter press is connected with a water outlet pipeline of the primary mixed reaction tank, and the outlet end of the primary membrane plate-and-frame filter press is provided with a sludge conveying pipeline and a filtered clear liquid water outlet pipeline; the primary filtrate collecting tank is used for collecting the filtered clear liquid of the primary membrane plate-and-frame filter press, and the inlet of the primary filtrate collecting tank is connected with a filtered clear liquid outlet pipeline of the primary membrane plate-and-frame filter press; the secondary treatment system comprises a secondary mixing reaction tank and a secondary diaphragm plate-and-frame filter press; the second-stage mixed reaction tank is used for removing metal ions, and a water inlet pipeline is connected with an outlet of the first-stage filtrate collecting tank; the inlet of the secondary membrane plate-and-frame filter press is connected with a water outlet pipeline of the secondary mixed reaction tank, and the outlet end of the secondary membrane plate-and-frame filter press is provided with a sludge conveying pipeline and a filtered clear liquid water outlet pipeline; the mother liquor middle water tank is used for collecting the filtered clear liquid of the secondary membrane plate-and-frame filter press, and the inlet of the mother liquor middle water tank is connected with a filtered clear liquid outlet pipeline of the secondary membrane plate-and-frame filter press; the tubular microfiltration system is used for microfiltration of water in mother liquor; the reverse osmosis membrane system is used for concentrating tubular microfiltration produced water and is connected with the tubular microfiltration system; the inlet of the MVR evaporation device is connected with the concentrated water outlet of the ultrahigh pressure reverse osmosis module of the reverse osmosis membrane device; the centrifuge 8 is used for centrifuging and separating salt from the crystallization mixed solution concentrated by the MVR evaporation device; and the inlet of the paddle dryer is respectively connected with the sludge conveying pipelines of the primary diaphragm plate-and-frame filter press and the secondary diaphragm plate-and-frame filter press.
Ferric phosphate mother liquor effluent disposal system, wherein: and the first branch and the second branch are respectively provided with an electric flow regulating valve for regulating the flow of two strands of mother liquor.
Iron phosphate mother liquor effluent disposal system, wherein: a pipeline mixer and an ammonia adding device are arranged on the main pipeline of the primary mixing reaction tank; and a stirring device and an acid-resistant and corrosion-resistant pump at the bottom are arranged in the primary mixing reaction tank.
Iron phosphate mother liquor effluent disposal system, wherein: and a stirring device is arranged in the secondary mixing reaction tank, an acid-resistant and corrosion-resistant pump is arranged at the bottom of the secondary mixing reaction tank, and a pipeline mixer and an ammonia adding device are arranged on the water inlet pipeline.
Iron phosphate mother liquor effluent disposal system, wherein: the tubular microfiltration device comprises a feeding reaction tank, a water feeding pump, a tubular microfiltration concentrated solution tank, a circulating pump, a tubular microfiltration membrane and a tubular microfiltration water production tank which are connected in sequence; the water outlet end of the tubular microfiltration concentrated solution tank is respectively connected with the feeding reaction tank, the circulating pump and the inlet of the secondary diaphragm plate-and-frame filter press; the water outlet end of the tubular micro-filtration membrane is respectively connected with the tubular micro-filtration production water tank and the tubular micro-filtration concentrated solution tank.
Ferric phosphate mother liquor effluent disposal system, wherein: the reverse osmosis membrane system comprises a high-pressure reverse osmosis module, a high-pressure reverse osmosis water producing tank, a high-pressure reverse osmosis concentrated water tank, an ultrahigh-pressure reverse osmosis module and a terminal reverse osmosis module; the inlet end of the high-pressure reverse osmosis module is connected with the tubular micro-filtration production water tank, and a lifting pump, a high-pressure pump and a security filter are sequentially arranged on a water inlet pipeline from the tubular micro-filtration production water tank to the high-pressure reverse osmosis module; the inlet of the high-pressure reverse osmosis water production pool is connected with the water production outlet of the high-pressure reverse osmosis module; the inlet of the high-pressure reverse osmosis concentrated water tank is respectively connected with the concentrated water outlets of the high-pressure reverse osmosis module and the terminal reverse osmosis module; the inlet of the ultrahigh pressure reverse osmosis module is connected with the high pressure reverse osmosis concentrated water tank, and a lifting pump, a high pressure pump and a security filter are sequentially arranged on a water inlet pipeline from the high pressure reverse osmosis concentrated water tank to the ultrahigh pressure reverse osmosis module; a water production outlet of the ultrahigh pressure reverse osmosis module is connected with the tubular microfiltration water production tank, and a concentrated water outlet is connected with the MVR evaporation device; the inlet of the terminal reverse osmosis module is connected with the high-pressure reverse osmosis water producing tank, and a lifting pump, a high-pressure pump and a security filter are sequentially arranged on a water inlet pipeline from the high-pressure reverse osmosis water producing tank to the terminal reverse osmosis module; and the produced water of the terminal reverse osmosis module is recycled, and a concentrated water outlet is connected with an inlet of the high-pressure reverse osmosis concentrated water tank.
Has the advantages that:
the invention separately collects the mother liquor wastewater generated in a production workshop according to water quality, respectively controls the flow, and adjusts the content ratio of metal ions and phosphorus in the mixed sedimentation tank, so that the effect of precipitating the metal ions in the pretreatment process is better, and the scaling of pipelines and water pump impellers and the pollution and blockage of reverse osmosis membrane devices are reduced or avoided.
After mother liquor water in an anhydrous iron phosphate production workshop is collected independently according to water quality, an overlarge adjusting tank is not needed to be used as a homogeneous water body, the sum of the volumes of a synthetic mother liquor collecting tank and an aging mother liquor collecting tank can be smaller than that of an original mother liquor adjusting tank, and the floor area of a water tank is reduced.
Phosphorus resources are fully utilized, and the extreme conditions that metal ions cannot be completely precipitated (equipment is polluted and blocked and scales are formed) and the phosphorus content is surplus after the metal ions are precipitated during mixed precipitation due to different water qualities of two mother liquor waters are avoided.
Drawings
FIG. 1 is a flow chart of the iron phosphate mother liquor wastewater treatment according to the invention;
FIG. 2 is a schematic structural diagram of a ferric phosphate mother liquor wastewater treatment system according to the present invention;
FIG. 3 is a schematic structural diagram of a tubular microfiltration device of the ferric phosphate mother liquor wastewater treatment system according to the invention;
fig. 4 is a schematic structural diagram of a reverse osmosis membrane device of the iron phosphate mother liquor wastewater treatment system.
Detailed Description
The method for treating the iron phosphate mother liquor wastewater comprises the steps of respectively introducing two strands of mother liquor water into two water collecting tanks, arranging a flowmeter and an electric regulating valve at the outlet of a water feeding pump to control the water yield, mixing the mother liquor water with different water qualities in proportion to control the proportion of polyvalent metal ions and phosphorus content in the mother liquor water to be optimal, carrying out chemical precipitation at the moment, enabling the polyvalent metal ions in the mixed mother liquor wastewater to be higher in removal rate, enabling the water quality treatment range of the mother liquor wastewater in the anhydrous iron phosphate production process to be wider, enabling generated precipitates to be used as slow release fertilizers after being dehydrated, and recycling phosphorus resources.
As shown in fig. 1, the method for treating iron phosphate mother liquor wastewater specifically comprises the following steps:
the first step is as follows: collecting mother liquor water in an anhydrous iron phosphate production workshop to a synthetic mother liquor collecting tank and an aging mother liquor collecting tank respectively according to different water qualities;
the second step is that: introducing two strands of mother liquor into a primary mixing reaction tank by using a lift pump, and controlling the flow of the two strands of mother liquor by using an electric regulating valve so that the two strands of mother liquor are mixed to flow into the primary mixing reaction tank, wherein the content of metal ions and the content of phosphorus in the primary mixing reaction tank reach corresponding proportions: 2.6-3 parts of Mg, P =1 part of Mn, 2-2.2 parts of Mn, P =1 part of Fe, 1.1 part of P, and the water quality phosphorus content is the sum of the ion ratios, when the water flows through a pipeline mixer on a main pipeline, an ammonia adding device adds ammonia water, the pH value of the discharged water is controlled to be 5.0-6.0, the hydraulic retention time is 30-60min, and polyvalent metal ions in the water are removed by chemical precipitation;
the third step: a stirring device is arranged in the primary mixing reaction tank, an acid-resistant corrosion-resistant pump is arranged at the bottom of the primary mixing reaction tank, the sludge-water mixed liquid in the water tank is conveyed to a membrane plate-and-frame filter press for sludge-water separation, the produced sludge is conveyed to a paddle dryer for dehydration and drying after the plate-and-frame pressing, the sludge is recovered as slow-release phosphate fertilizer, and the filtered clear liquid enters a primary filtrate collection tank;
the fourth step: lifting the clear liquid in the primary filtrate tank to a secondary mixing reaction tank by using a lifting pump, adding ammonia water into an ammonia adding device when the clear liquid flows through a pipeline mixer of a main pipeline, controlling the pH value to be 8.5-9.0, and keeping the hydraulic retention time to be 15-30min, and removing the rest metal ions;
the fifth step: conveying the sludge-water mixed liquor of the secondary mixing reaction tank to a plate-and-frame filter press by using an acid-resistant corrosion-resistant pump for sludge-water separation, and conveying the generated sludge to a paddle dryer for dehydration and drying after plate-and-frame pressing, wherein the component is mainly magnesium ammonium phosphate which can be recovered as a slow-release fertilizer; filtering the clear liquid to enter a mother liquid middle water pool;
and a sixth step: lifting water in a mother liquor middle water pool into a tubular microfiltration device by using a lifting pump, wherein the tubular microfiltration device comprises a feeding reaction box, a water feeding pump, a tubular microfiltration concentrated solution box, a circulating pump and a tubular microfiltration membrane, water in the mother liquor middle water pool circulates in the tubular microfiltration device, produced water enters a tubular microfiltration produced water pool, concentrated water circulates in the tubular microfiltration device, ammonia is added for precipitation and then enters the tubular microfiltration concentrated solution box, a bottom mud-water mixed solution conveying pump is conveyed to a plate frame filter press, and filter liquor returns to the feeding reaction box;
the seventh step: the water in the tubular microfiltration production tank is lifted to a reverse osmosis membrane device by a lifting pump, and the reverse osmosis device comprises a high-pressure reverse osmosis module, an ultrahigh-pressure reverse osmosis module, a lifting pump, a high-pressure pump and a cartridge filter. Concentrating the tubular microfiltration produced water through a membrane device, taking the produced water as reuse water, leading the electrical conductivity to be less than or equal to 50 mu s/cm, leading the concentrated water to have high salt content, and leading the concentrated water to enter an MVR evaporation device;
eighth step: and (3) after the high-salt concentrated water entering the MVR device is evaporated and concentrated, raising the temperature of the water body, raising the density, and when the density reaches 1.38 to 1.5g/cm, pouring the concentrated crystallization mixed liquid into a centrifugal machine, and separating salt through the centrifugal machine, wherein the salt product is ammonium sulfate.
According to the method for treating the wastewater of the ferric phosphate mother liquor, the mother liquor wastewater generated in the production process of anhydrous ferric phosphate is separately collected according to different water qualities, and the optimal proportion of metal ions and phosphorus content in a mixed water body is controlled by artificial interference, so that the pretreatment effect of the mother liquor is better, the application range is wide, and a sewage treatment system can be prevented from being influenced even if the water quality of a workshop changes; the pretreatment method of the mother liquor is compared with the same homogeneous regulating tank, and under the condition that other coagulation and flocculation reagents are not added, the content of metal ions in the water body can be reduced to the minimum, the scaling condition of pipelines and water pump impellers and the pollution and blockage condition of a membrane system during the operation and maintenance of a sewage treatment system are avoided to the maximum extent, and the cost of later-stage operation and maintenance is reduced.
As shown in fig. 2, the iron phosphate mother liquor wastewater treatment system adopting the treatment method comprises a mother liquor collection tank 1, a primary pretreatment system 2, a secondary pretreatment system 3, a mother liquor middle water tank 4, a tubular microfiltration system 5, a reverse osmosis membrane device 6, an MVR evaporation device 7, a centrifuge 8 and a paddle dryer 9.
The mother liquor collecting tank 1 comprises a synthetic mother liquor collecting tank 11 and an aging mother liquor collecting tank 12; the synthesis mother liquor collecting tank 11 is used for collecting synthesis mother liquor; the aging mother liquor collecting tank 12 is used for collecting aging mother liquor.
The primary treatment system 2 comprises a primary mixing reaction tank 21, a primary diaphragm plate-and-frame filter press 22 and a primary filtrate collecting tank 23;
the primary mixing reaction tank 21 is used for mixing the synthetic mother liquor and the aging mother liquor, and comprises a water inlet pipeline and a water outlet pipeline, wherein the water inlet pipeline comprises a main pipeline, and a first branch and a second branch which are respectively connected with the synthetic mother liquor collecting tank and the aging mother liquor collecting tank; the main pipeline is provided with a pipeline mixer and an ammonia adding device; the first branch and the second branch are respectively provided with an electric flow regulating valve for regulating the flow of the two strands of mother liquor; a stirring device and an acid-resistant and corrosion-resistant pump at the bottom are arranged in the primary mixing reaction tank;
the inlet of the first-stage membrane plate-and-frame filter press 22 is connected with the water outlet pipeline of the first-stage mixing reaction tank, and the outlet end is provided with a sludge conveying pipeline and a clear liquid filtering water outlet pipeline;
the primary filtrate collecting tank 23 is used for collecting the filtered clear liquid of the primary membrane plate-and-frame filter press, and the inlet of the primary filtrate collecting tank is connected with a clear liquid filtering outlet pipeline of the primary membrane plate-and-frame filter press.
The secondary treatment system 3 comprises a secondary mixing reaction tank 31 and a secondary diaphragm plate-and-frame filter press 32;
the second-stage mixing reaction tank 31 is used for removing metal ions, a water inlet pipeline is connected with an outlet of the first-stage filtrate collecting tank, and a pipeline mixer and an ammonia adding device are arranged on the water inlet pipeline; a stirring device is arranged in the secondary mixing reaction tank, and an acid-resistant and corrosion-resistant pump is arranged at the bottom of the secondary mixing reaction tank;
the inlet of the second-stage membrane plate-and-frame filter press 32 is connected with the water outlet pipeline of the second-stage mixing reaction tank, and the outlet end is provided with a sludge conveying pipeline and a clear liquid filtering water outlet pipeline.
And the mother liquor middle water tank 4 is used for collecting the filtered clear liquid of the secondary membrane plate-and-frame filter press 32, and the inlet of the mother liquor middle water tank is connected with a clear liquid filtering water outlet pipeline of the secondary membrane plate-and-frame filter press 32.
The tubular microfiltration system 5 is used for carrying out microfiltration on water in the mother liquor; as shown in fig. 3, the tubular microfiltration system 5 comprises a feed reaction tank 51, a feed pump 52, a tubular microfiltration concentrate tank 53, a circulating pump 54, a tubular microfiltration membrane 55 and a tubular microfiltration product water tank 56 which are connected in sequence; the water outlet end of the tubular microfiltration concentrate tank 53 is respectively connected with the feeding reaction tank 51, the circulating pump 54 and the inlet of the secondary membrane plate-and-frame filter press 32, and a tubular microfiltration sludge tank 57 is arranged between the tubular microfiltration concentrate tank 53 and the secondary membrane plate-and-frame filter press 32; the water outlet end of the tubular micro-filtration membrane 55 is respectively connected with a tubular micro-filtration production water tank 56 and a tubular micro-filtration concentrated solution tank 53.
The reverse osmosis membrane system 6 is used for concentrating tubular microfiltration produced water and is connected with a tubular microfiltration produced water tank 56 of the tubular microfiltration system 5; as shown in fig. 4, the reverse osmosis membrane system 6 includes a high-pressure reverse osmosis module 61, a high-pressure reverse osmosis water producing tank 62, a high-pressure reverse osmosis concentrated tank 63, an ultrahigh-pressure reverse osmosis module 64, and a terminal reverse osmosis module 65;
the inlet end of the high-pressure reverse osmosis module 61 is connected with the tubular microfiltration yielding water tank 56, and a lifting pump, a high-pressure pump and a safety filter are sequentially arranged on the water inlet pipeline from the tubular microfiltration yielding water tank 56 to the high-pressure reverse osmosis module 61;
an inlet of the high-pressure reverse osmosis water production tank 62 is connected with a water production outlet of the high-pressure reverse osmosis module 61;
the inlet of the high-pressure reverse osmosis concentrated water tank 63 is respectively connected with the concentrated water outlets of the high-pressure reverse osmosis module 61 and the terminal reverse osmosis module 65;
the inlet of the ultrahigh pressure reverse osmosis module 64 is connected with the high pressure reverse osmosis concentrated water tank 63, and a lifting pump, a high pressure pump and a cartridge filter are sequentially arranged on the water inlet pipeline from the high pressure reverse osmosis concentrated water tank 63 to the ultrahigh pressure reverse osmosis module 64; the produced water outlet of the ultrahigh pressure reverse osmosis module 64 is connected with the tubular microfiltration produced water tank 56, and the concentrated water outlet is connected with the MVR evaporation device 7;
the inlet of the terminal reverse osmosis module 65 is connected with the high-pressure reverse osmosis water producing tank 62, and a lifting pump, a high-pressure pump and a cartridge filter are sequentially arranged on the water inlet pipeline from the high-pressure reverse osmosis water producing tank 62 to the terminal reverse osmosis module 65; the produced water of the terminal reverse osmosis module 65 is recycled, and the concentrated water outlet is connected with the inlet of the high-pressure reverse osmosis concentrated water tank 63.
An inlet of the MVR evaporation device 7 is connected with a concentrated water outlet of the ultrahigh pressure reverse osmosis module 64 of the reverse osmosis membrane device 6; high-pressure reverse osmosis (greater than or equal to 12 Mpa) concentrated water is produced into a concentrated solution pool, the concentrated water is introduced into an MVR evaporation device 7 through a lifting pump, and the density is improved to separate out salt crystals through evaporation concentration.
And the centrifuge 8 is used for centrifuging and separating salt from the crystallization mixed liquid concentrated by the MVR evaporation device 7.
And the paddle dryer 9 is used for recovering sludge generated by dehydration and drying as slow release fertilizer, and the inlet of the paddle dryer is respectively connected with the sludge conveying pipelines of the primary membrane plate and frame filter press 22 and the secondary membrane plate and frame filter press 32.
The treatment system uses the tubular microfiltration membrane as a front-end treatment device of the reverse osmosis system, the tubular microfiltration membrane adopts a ceramic membrane, the requirement on pressure during operation is small, generally lower than 4 multiplied by 10^4 Pa, the operation is safe and stable, compared with the traditional ultrafiltration membrane which adopts a hollow fiber membrane, the operation pressure is generally 4 multiplied by 10^4 Pa-7 multiplied by 10^5 Pa, the membrane is easy to block when the membrane is not cleaned in time, and the membrane is easy to damage when the pressure difference of inflow water and production water is too large, so that the treatment system has great advantages.
The invention is further illustrated by the following specific examples.
Example 1
The system of the invention is adopted, and the specific processing method comprises the following steps:
the first step is as follows: collecting mother liquor water in an anhydrous iron phosphate production workshop to a synthetic mother liquor collecting tank and an aging mother liquor collecting tank respectively according to different water qualities;
the second step: introducing two mother liquor waters into a first-stage mixing reaction tank by using a lift pump, controlling the flow of the two mother liquor waters by using an electric regulating valve, mixing the two mother liquor waters, and making the two mother liquor waters flow into the first-stage mixing reaction tank, when the metal ion content and the phosphorus content in the waters reach Mg: P =1, 2, mn: P =1, 1.1, and the phosphorus content of the water quality is the sum of the ion proportions, flowing through a pipeline mixer on a main pipeline, adding ammonia water by an ammonia adding device, controlling the pH value of the effluent to be 6.0, and performing hydraulic retention for 30min, and removing polyvalent metal ions in the waters by chemical precipitation;
the third step: a stirring device is arranged in the primary mixing reaction tank, an acid-resistant corrosion-resistant pump is arranged at the bottom of the primary mixing reaction tank, the sludge-water mixed liquid in the water tank is conveyed to a membrane plate-and-frame filter press for sludge-water separation, the produced sludge is conveyed to a paddle dryer for dehydration and drying after the plate-and-frame pressing, the sludge is recovered as slow-release phosphate fertilizer, and the filtered clear liquid enters a primary filtrate collection tank;
the fourth step: lifting the clear liquid in the primary filtrate tank to a secondary mixing reaction tank by using a lifting pump, adding ammonia water by using an ammonia adding device when the clear liquid flows through a pipeline mixer of a main pipeline, controlling the pH value to be 9.0, and performing hydraulic retention for 20min to remove the rest metal ions;
the fifth step: conveying the sludge-water mixed liquor of the secondary mixing reaction tank to a plate-and-frame filter press by using an acid-resistant corrosion-resistant pump for sludge-water separation, and conveying the generated sludge to a paddle dryer for dehydration and drying after plate-and-frame pressing, wherein the component is mainly magnesium ammonium phosphate which can be recovered as a slow-release fertilizer; filtering the clear liquid to enter a mother liquid middle water pool;
and a sixth step: lifting water in a mother liquor middle water tank into a tubular microfiltration device by using a lifting pump, wherein the tubular microfiltration device comprises a feeding reaction tank, a water feeding pump, a tubular microfiltration concentrated solution tank, a circulating pump and a tubular microfiltration membrane, water in the mother liquor middle water tank circulates in the tubular microfiltration device, produced water enters a tubular microfiltration produced water tank, concentrated water circulates in the tubular microfiltration device and is added with ammonia for precipitation, a mud-water mixture enters the tubular microfiltration concentrated solution tank, a bottom mud-water mixed solution is conveyed to a secondary plate frame filter press by using a conveying pump, and a filtrate of the tubular microfiltration concentrated solution tank returns to the feeding reaction tank;
the seventh step: the method comprises the following steps of lifting water in a tubular microfiltration production water tank to a reverse osmosis membrane device by using a lifting pump, wherein the reverse osmosis device comprises a high-pressure reverse osmosis module, an ultrahigh-pressure reverse osmosis module, a lifting pump, a high-pressure pump and a cartridge filter. After tubular microfiltration produced water is concentrated by a membrane device, the produced water is used as reuse water, and the concentrated water has high salt content and enters an MVR evaporation device;
the eighth step: get into the concentrated water of high salt of MVR device and pass through evaporation concentration after, water temperature risees, and density risees, when density reaches 1.38g/cm when cultivating, pours into the crystallization mixed liquid after the concentration into centrifuge, divides the salt through centrifuge, and the salt result is the ammonium sulfate.
The sample detection data for example 1 is shown in table 1:
table 1 sample testing data for example 1
Example 2
The system of the invention is adopted, and the specific processing method comprises the following steps:
the first step is as follows: collecting mother liquor water in an anhydrous iron phosphate production workshop to a synthetic mother liquor collecting tank and an aging mother liquor collecting tank respectively according to different water qualities;
the second step: introducing two mother liquor waters into a first-stage mixing reaction tank by using a lift pump, controlling the flow of the two mother liquor waters by using an electric regulating valve, leading the metal ion content and the phosphorus content of the water mixed and flowing into the first-stage mixing reaction tank to be Mg: P =1, mn: P = 1.2, fe: P = 1.1, and leading the water quality phosphorus content to be the sum of the ion ratios, adding ammonia water into an ammonia adding device when flowing through a pipeline mixer on a main pipeline, controlling the pH value of effluent to be 5.0, and leading the hydraulic retention time to be 40min, and removing multivalent metal ions in the water by chemical precipitation;
the third step: conveying the sludge-water mixed liquor in the primary mixed reaction tank into a primary diaphragm plate-and-frame filter press for sludge-water separation, after plate-and-frame squeezing, conveying the generated sludge into a paddle dryer for dehydration and drying, recovering the sludge as a slow-release phosphate fertilizer, and conveying the filtered clear liquid into a primary filtrate collecting tank;
the fourth step: lifting the clear liquid in the primary filtrate tank to a secondary mixing reaction tank by using a lifting pump, adding ammonia water by using an ammonia adding device when the clear liquid flows through a pipeline mixer of a main pipeline, controlling the pH value to be 8.5, and allowing hydraulic retention time to be 30min to remove other metal ions;
the fifth step: conveying the sludge-water mixed liquor in the secondary mixing reaction tank to a plate-and-frame filter press by using an acid-resistant corrosion-resistant pump for sludge-water separation, and conveying the generated sludge to a paddle dryer for dehydration and drying after the plate-and-frame press is carried out, wherein the components mainly comprise magnesium ammonium phosphate which can be recovered as a slow release fertilizer; filtering the clear liquid to enter a mother liquid middle water pool;
and a sixth step: lifting water in a mother liquor middle water tank into a tubular microfiltration device by using a lifting pump, wherein the tubular microfiltration device comprises a feeding reaction tank, a water feeding pump, a tubular microfiltration concentrated solution tank, a circulating pump and a tubular microfiltration membrane, water in the mother liquor middle water tank circulates in the tubular microfiltration device, produced water enters a tubular microfiltration produced water tank, concentrated water circulates in the tubular microfiltration device, the concentrated water enters the tubular microfiltration concentrated solution tank after the concentration is improved, a bottom mud-water mixed solution is conveyed to a plate and frame filter press by using a conveying pump, and filtered liquid returns to the feeding reaction tank;
the seventh step: lifting water in the tubular microfiltration production water tank to a reverse osmosis membrane device by using a lifting pump, wherein the reverse osmosis device comprises a high-pressure reverse osmosis module, an ultrahigh-pressure reverse osmosis module, a lifting pump, a high-pressure pump and a cartridge filter; after tubular microfiltration produced water is concentrated by a membrane device, the produced water is used as reuse water, and the concentrated water has high salt content and enters an MVR evaporation device;
eighth step: after the high-salt concentrated water entering the MVR device is evaporated and concentrated, the temperature of the water body rises, the density rises, when the density reaches 1.40g/cm for carrying out thin film evaporation and concentration, the concentrated crystallization mixed liquid is poured into a centrifugal machine, salt is separated through the centrifugal machine, and a salt product is ammonium sulfate.
The sample assay data for example 2 is shown in table 2:
table 2 sample testing data for example 2
Example 3
The system of the invention is adopted, and the specific processing method comprises the following steps:
the first step is as follows: collecting mother liquor water in an anhydrous iron phosphate production workshop to a synthetic mother liquor collecting tank and an aging mother liquor collecting tank respectively according to different water qualities;
the second step is that: introducing two streams of mother liquor water into a first-stage mixing reaction tank by using a lift pump, wherein the flow of the water is controlled by using an electric regulating valve, so that the ratio of the metal ion content to the phosphorus content of the water mixed and flowing into the first-stage mixing reaction tank is Mg: P =1, 2.1 of Mn: P =1, 1.1 of Fe: P =1, and the phosphorus content of water quality is the sum of the ion ratios, when the water flows through a pipeline mixer on a main pipeline, adding ammonia water into an ammonia adding device, controlling the pH value of effluent to be 5.5, and performing hydraulic retention for 30min to remove polyvalent metal ions in the water by chemical precipitation;
the third step: a stirring device is arranged in the primary mixing reaction tank, an acid-resistant corrosion-resistant pump is arranged at the bottom of the primary mixing reaction tank, the sludge-water mixed liquid in the water tank is conveyed to a membrane plate-and-frame filter press for sludge-water separation, the produced sludge is conveyed to a paddle dryer for dehydration and drying after the plate-and-frame pressing, the sludge is recovered as slow-release phosphate fertilizer, and the filtered clear liquid enters a primary filtrate collection tank;
the fourth step: lifting the clear liquid in the primary filtrate tank to a secondary mixing reaction tank by using a lifting pump, adding ammonia water by using an ammonia adding device when the clear liquid flows through a pipeline mixer of a main pipeline, controlling the pH value to be 8.9, and controlling the hydraulic retention time to be 15min to remove the rest metal ions;
the fifth step: conveying the sludge-water mixed liquor in the secondary mixing reaction tank to a plate-and-frame filter press by using an acid-resistant corrosion-resistant pump for sludge-water separation, and conveying the generated sludge to a paddle dryer for dehydration and drying after the plate-and-frame press is carried out, wherein the components mainly comprise magnesium ammonium phosphate which can be recovered as a slow release fertilizer; filtering the clear liquid to enter a mother liquid middle water pool;
and a sixth step: lifting water in a mother liquor water tank to a tubular microfiltration device by using a lifting pump, circulating a mother liquor water tank water body in the tubular microfiltration device, feeding produced water into a tubular microfiltration water producing tank, and circulating concentrated water in the tubular microfiltration device;
the seventh step: lifting the water in the tubular microfiltration water producing tank to a reverse osmosis membrane device by using a lifting pump, concentrating the tubular microfiltration water producing tank by using the membrane device, taking the produced water as reuse water, and enabling the concentrated water to have high salt content and enter an MVR (mechanical vapor recompression) evaporation device;
eighth step: after the high-salt concentrated water entering the MVR device is evaporated and concentrated and the density reaches 1.42g/cm, pouring the concentrated crystallization mixed liquid into a centrifugal machine, and separating salt through the centrifugal machine.
The sample assay data for example 3 is shown in table 3:
table 3 sample testing data for example 3
Example 4
The system of the invention is adopted, and the specific processing method comprises the following steps:
the first step is as follows: collecting mother liquor water of an anhydrous iron phosphate production workshop to a synthetic mother liquor collecting tank and an aging mother liquor collecting tank respectively according to different water qualities;
the second step is that: introducing two strands of mother liquor water into a first-stage mixing reaction tank by using a lift pump, and controlling the flow of the two strands of mother liquor water by using an electric regulating valve, so that the metal ion content and phosphorus content ratio of the water mixed and flowing into the first-stage mixing reaction tank is as follows: the water quality phosphorus content is the sum of the ion ratios, when the water flows through a pipeline mixer on the main pipeline, an ammonia adding device adds ammonia water, the pH value of the discharged water is controlled to be 5.6, the hydraulic retention time is 60min, and polyvalent metal ions in the water are removed by chemical precipitation;
the third step: a stirring device is arranged in the primary mixing reaction tank, an acid-resistant corrosion-resistant pump is arranged at the bottom of the primary mixing reaction tank, the sludge-water mixed liquid in the water tank is conveyed to a membrane plate-and-frame filter press for sludge-water separation, the produced sludge is conveyed to a paddle dryer for dehydration and drying after the plate-and-frame pressing, the sludge is recovered as slow-release phosphate fertilizer, and the filtered clear liquid enters a primary filtrate collection tank;
the fourth step: lifting the clear liquid in the primary filtrate tank to a secondary mixing reaction tank by using a lifting pump, adding ammonia water by using an ammonia adding device when the clear liquid flows through a pipeline mixer of a main pipeline, controlling the pH value to be 8.7, and allowing hydraulic retention time to be 25min to remove other metal ions;
the fifth step: conveying the sludge-water mixed liquor of the secondary mixing reaction tank to a plate-and-frame filter press for sludge-water separation, and conveying the generated sludge to a paddle dryer for dehydration and drying after plate-and-frame pressing, wherein the component is mainly magnesium ammonium phosphate which can be recovered as slow-release fertilizer; filtering the clear liquid to enter a mother liquid middle water pool;
and a sixth step: lifting water in a mother liquor water tank to a tubular microfiltration device by using a lifting pump, circulating a mother liquor water tank water body in the tubular microfiltration device, feeding produced water into a tubular microfiltration water producing tank, and circulating concentrated water in the tubular microfiltration device;
the seventh step: lifting the water in the tubular microfiltration water producing tank to a reverse osmosis membrane device by using a lifting pump, concentrating the tubular microfiltration water producing tank by using the membrane device, taking the produced water as reuse water, and enabling the concentrated water to have high salt content and enter an MVR (mechanical vapor recompression) evaporation device;
eighth step: after the high-salt concentrated water entering the MVR device is evaporated and concentrated, when the density reaches 1.40g/cm, pouring the concentrated crystallization mixed liquid into a centrifugal machine, and separating salt through the centrifugal machine.
Claims (9)
1. The iron phosphate mother liquor wastewater treatment method comprises the steps of respectively introducing two strands of mother liquor water into two water collecting tanks, controlling the water outlet amount of the two water collecting tanks, mixing the mother liquor water with different water quality, controlling the ratio of polyvalent metal ions to phosphorus content in the mother liquor water to be within the range of 2.6-3 of Mg: P =1, 2-2.2 of Mn: P =1, 1.1 of Fe: P =1, and controlling the phosphorus content of water to be the sum of the ion ratios, carrying out chemical precipitation to remove the polyvalent metal ions in the mixed mother liquor wastewater, reducing the polyvalent metal ions to be below 5ppm, dehydrating the generated precipitate, recovering the precipitate as slow release fertilizer and phosphorus resource, and recycling the produced water.
2. The method for treating the iron phosphate mother liquor wastewater according to claim 1, comprising the following steps:
the first step is as follows: respectively collecting mother liquor water in an anhydrous iron phosphate production workshop according to different water qualities;
the second step is that: introducing two mother liquor waters into a primary mixing reaction tank, controlling the flow of the two mother liquor waters, controlling the ratio of metal ion content to phosphorus content in the water after the two mother liquor waters are mixed and flow into the primary mixing reaction tank to be controlled in a range from 2.6 to 3 of Mg: P =1, from 2 to 2.2 of Mn: P =1, from 1.1 of Fe: P =1, controlling the phosphorus content in the water to be the sum of the ion ratios, adding ammonia water, controlling the pH value of effluent to be 5.0 to 6.0, controlling the hydraulic retention time to be 30 to 60min, and removing polyvalent metal ions in the water by chemical precipitation;
the third step: carrying out mud-water separation on the mud-water mixed liquor in the primary mixing reaction tank, squeezing a plate frame, and dehydrating and drying the generated sludge to recover as a slow-release phosphate fertilizer;
the fourth step: lifting the filtered clear liquid in the third step to a second-stage mixing reaction tank, adding ammonia water, controlling the pH value to be 8.5-9.0, and keeping the hydraulic retention time to be 15-30min, and removing the rest metal ions;
the fifth step: carrying out mud-water separation on the mud-water mixed liquid in the secondary mixing reaction tank, carrying out plate-frame pressing, and dehydrating and drying the generated sludge, wherein the component is mainly magnesium ammonium phosphate which can be recovered as a slow release fertilizer; filtering the clear liquid to enter a mother liquid middle water pool;
and a sixth step: water in a water tank in the mother liquor enters a tubular microfiltration cycle, the produced water enters the next step, and the concentrated water continues the tubular microfiltration cycle;
the seventh step: concentrating the produced water in the sixth step by using a reverse osmosis membrane, and taking the produced water as reuse water;
the eighth step: and seventhly, carrying out MVR evaporation concentration on the concentrated water with high salt content, and centrifuging the concentrated crystallization mixed solution for separating salt when the density reaches 1.38 to 1.42g/cm for carrying out ethanol precipitation so as to obtain the salt product ammonium sulfate.
3. The method for treating wastewater of iron phosphate mother liquor according to claim 2, characterized by comprising the following steps: and in the sixth step, the concentrated water is circulated through tubular microfiltration, ammonia is added for precipitation, the mud-water mixture is subjected to mud-water separation plate frame pressing, and the filtered clear liquid returns to the tubular microfiltration circulation.
4. The utility model provides an iron phosphate mother liquor effluent disposal system which characterized in that: the treatment system comprises a mother liquor collecting tank, a primary pretreatment system, a secondary pretreatment system, a mother liquor middle water tank, a tubular microfiltration system, a reverse osmosis membrane device, an MVR evaporation device, a centrifugal machine and a paddle dryer;
the mother liquor collecting tank comprises a synthetic mother liquor collecting tank and an aging mother liquor collecting tank;
the primary treatment system comprises a primary mixing reaction tank, a primary diaphragm plate-and-frame filter press and a primary filtrate collecting tank;
the primary mixing reaction tank is used for mixing the synthetic mother liquor and the aging mother liquor and comprises a water inlet pipeline and a water outlet pipeline; the water inlet pipeline comprises a main pipeline, a first branch and a second branch, wherein the first branch and the second branch are respectively connected with the synthesized mother liquor collecting tank and the aged mother liquor collecting tank;
the inlet of the primary membrane plate-and-frame filter press is connected with a water outlet pipeline of the primary mixing reaction tank, and the outlet end of the primary membrane plate-and-frame filter press is provided with a sludge conveying pipeline and a clear liquid filtering water outlet pipeline;
the primary filtrate collecting tank is used for collecting the filtered clear liquid of the primary membrane plate-and-frame filter press, and the inlet of the primary filtrate collecting tank is connected with a filtered clear liquid outlet pipeline of the primary membrane plate-and-frame filter press;
the secondary treatment system comprises a secondary mixing reaction tank and a secondary diaphragm plate-and-frame filter press;
the second-stage mixed reaction tank is used for removing metal ions, and a water inlet pipeline is connected with an outlet of the first-stage filtrate collecting tank;
the inlet of the secondary membrane plate-and-frame filter press is connected with a water outlet pipeline of the secondary mixing reaction tank, and the outlet end of the secondary membrane plate-and-frame filter press is provided with a sludge conveying pipeline and a clear liquid filtering water outlet pipeline;
the mother liquor middle water tank is used for collecting the filtered clear liquid of the secondary membrane plate-and-frame filter press, and the inlet of the mother liquor middle water tank is connected with a filtered clear liquid outlet pipeline of the secondary membrane plate-and-frame filter press;
the tubular microfiltration system is used for microfiltration of water in mother liquor;
the reverse osmosis membrane system is used for concentrating tubular microfiltration produced water and is connected with the tubular microfiltration system;
the inlet of the MVR evaporation device is connected with the concentrated water outlet of the ultrahigh pressure reverse osmosis module of the reverse osmosis membrane device;
the centrifuge 8 is used for centrifuging and separating salt from the crystallization mixed solution concentrated by the MVR evaporation device;
and the inlet of the paddle dryer is respectively connected with the sludge conveying pipelines of the primary diaphragm plate-and-frame filter press and the secondary diaphragm plate-and-frame filter press.
5. The iron phosphate mother liquor wastewater treatment system according to claim 4, characterized in that: and the first branch and the second branch are respectively provided with an electric flow regulating valve for regulating the flow of two mother liquor.
6. The iron phosphate mother liquor wastewater treatment system according to claim 4, characterized in that: a pipeline mixer and an ammonia adding device are arranged on the main pipeline of the primary mixing reaction tank; and a stirring device and an acid-resistant and corrosion-resistant pump at the bottom are arranged in the primary mixing reaction tank.
7. The iron phosphate mother liquor wastewater treatment system according to claim 4, characterized in that: and a stirring device is arranged in the secondary mixing reaction tank, an acid-resistant and corrosion-resistant pump is arranged at the bottom of the secondary mixing reaction tank, and a pipeline mixer and an ammonia adding device are arranged on the water inlet pipeline.
8. The iron phosphate mother liquor wastewater treatment system according to claim 4, characterized in that: the tubular microfiltration device comprises a feeding reaction tank, a water feeding pump, a tubular microfiltration concentrated solution tank, a circulating pump, a tubular microfiltration membrane and a tubular microfiltration water production tank which are connected in sequence;
the water outlet end of the tubular microfiltration concentrated solution tank is respectively connected with the feeding reaction tank, the circulating pump and the inlet of the secondary membrane plate-and-frame filter press;
the water outlet end of the tubular microfiltration membrane is respectively connected with the tubular microfiltration water generating tank and the tubular microfiltration concentrated solution tank.
9. The iron phosphate mother liquor wastewater treatment system according to claim 4, characterized in that: the reverse osmosis membrane system comprises a high-pressure reverse osmosis module, a high-pressure reverse osmosis water producing tank, a high-pressure reverse osmosis concentrated water tank, an ultrahigh-pressure reverse osmosis module and a terminal reverse osmosis module;
the inlet end of the high-pressure reverse osmosis module is connected with the tubular micro-filtration production water tank, and a lifting pump, a high-pressure pump and a security filter are sequentially arranged on a water inlet pipeline from the tubular micro-filtration production water tank to the high-pressure reverse osmosis module;
the inlet of the high-pressure reverse osmosis water production pool is connected with the water production outlet of the high-pressure reverse osmosis module;
the inlet of the high-pressure reverse osmosis concentrated water tank is respectively connected with the concentrated water outlets of the high-pressure reverse osmosis module and the terminal reverse osmosis module;
the inlet of the ultrahigh pressure reverse osmosis module is connected with the high pressure reverse osmosis concentrated water tank, and a lifting pump, a high pressure pump and a security filter are sequentially arranged on a water inlet pipeline from the high pressure reverse osmosis concentrated water tank to the ultrahigh pressure reverse osmosis module; a water production outlet of the ultrahigh pressure reverse osmosis module is connected with the tubular microfiltration water production tank, and a concentrated water outlet is connected with the MVR evaporation device;
the inlet of the terminal reverse osmosis module is connected with the high-pressure reverse osmosis water producing tank, and a lifting pump, a high-pressure pump and a security filter are sequentially arranged on a water inlet pipeline from the high-pressure reverse osmosis water producing tank to the terminal reverse osmosis module; and the produced water of the terminal reverse osmosis module is recycled, and a concentrated water outlet is connected with an inlet of the high-pressure reverse osmosis concentrated water tank.
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| CN110759532A (en) * | 2019-11-07 | 2020-02-07 | 山东鑫动能锂电科技有限公司 | High-salt concentrated water treatment process for producing iron phosphate by sodium method |
| CN111635053A (en) * | 2020-05-25 | 2020-09-08 | 深圳能源资源综合开发有限公司 | Desulfurization wastewater zero-discharge treatment system and method |
| CN113860546A (en) * | 2021-09-28 | 2021-12-31 | 四川思达能环保科技有限公司 | Treatment system and treatment method for wastewater generated in production of anhydrous iron phosphate |
| CN114105392A (en) * | 2021-12-27 | 2022-03-01 | 昆山三一环保科技有限公司 | Iron phosphate wastewater treatment method and system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117049732A (en) * | 2023-08-22 | 2023-11-14 | 深圳市华虹清源环保科技有限公司 | Method and device for treating wastewater from iron phosphate production |
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