CN218403895U - Iron phosphate wastewater treatment device - Google Patents
Iron phosphate wastewater treatment device Download PDFInfo
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- CN218403895U CN218403895U CN202222516465.5U CN202222516465U CN218403895U CN 218403895 U CN218403895 U CN 218403895U CN 202222516465 U CN202222516465 U CN 202222516465U CN 218403895 U CN218403895 U CN 218403895U
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- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Abstract
The utility model discloses a processing apparatus of ferric phosphate waste water relates to waste water treatment technical field, including mother liquor pretreatment unit, rinsing pretreatment of water unit, concentrated unit and desalination unit, mother liquor pretreatment of unit is used for collecting and the preliminary treatment to the mother liquor that discharges, rinsing pretreatment of water unit is used for collecting and the preliminary treatment to the rinsing water that discharges, concentrated unit is used for mixing and concentrating the rinsing water after mother liquor after the preliminary treatment and the preliminary treatment, and the concentrate that concentrated unit produced is used for the evaporation crystallization water, the desalination unit is arranged in mixing and the desalination to the product water of each component in the concentrated unit, the fresh water that the desalination unit produced can be retrieved. This processing apparatus of ferric phosphate waste water has realized that the zero release of ferric phosphate waste water is handled and resource retrieval and utilization.
Description
Technical Field
The utility model relates to a waste water treatment technical field specifically relates to a processing apparatus of ferric phosphate waste water.
Background
In the lithium battery industry, the positive electrode material is one of the core materials, and nowadays, the positive electrode material includes ternary material, lithium cobaltate, lithium iron phosphate, and the like. In the total sales of domestic power batteries at present, the ratio of lithium iron phosphate batteries is increasing day by day, and the speed is far higher than that of other positive electrode materials. While the industry is growing at a high speed, the iron phosphate wastewater is also seriously examined for the environment.
The wastewater in the iron phosphate industry mainly comprises mother liquor and rinsing water, wherein the mother liquor has small water content and high salt content, and the rinsing water has large water content and lower salt content relative to the mother liquor. The conventional treatment method at present is a sodium regulation method, metal ions in water are removed by adding sodium hydroxide, then mixed mother liquor and rinsing water enter a reverse osmosis unit for desalination treatment, and the final produced water is lower than a discharge index after two-stage or three-stage desalination treatment as a process requirement. The method inevitably introduces sodium ions, and the purity of sodium phosphate and sodium sulfate in the concentrated water is not high, and the product value of the sodium phosphate and the sodium sulfate is low.
In conclusion, how to treat the iron phosphate wastewater by a zero-discharge idea and how to improve the value of byproducts are important subjects in the water treatment of the iron phosphate industry.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a processing apparatus of ferric phosphate waste water to solve the problem that above-mentioned prior art exists, realized the zero release of ferric phosphate waste water and handled and the retrieval and utilization of resourceful.
In order to achieve the above object, the utility model provides a following scheme:
the utility model provides a processing apparatus of ferric phosphate waste water, including mother liquor pretreatment unit, rinsing pretreatment of water unit, concentrated unit and desalination unit, mother liquor pretreatment of water unit is used for collecting and the preliminary treatment the mother liquor that discharges, rinsing pretreatment of water unit is used for collecting and the preliminary treatment to the rinsing water that discharges, concentrated unit is arranged in mixing and concentrating the mother liquor after the preliminary treatment and the rinsing water after the preliminary treatment, just the concentrate that the concentrated unit produced is used for the evaporative crystallization water, the desalination unit is used for right the product water of each component mixes and desalination in the concentrated unit, the fresh water that the desalination unit produced can be retrieved.
Preferably, the mother liquor pretreatment unit includes first equalizing basin subassembly, mixed reaction tank and mother liquor filtering ponds subassembly, first equalizing basin subassembly is used for carrying out quality of water volume regulation and alkaline regulation to the mother liquor, mixed reaction tank is used for mixing the mother liquor after will adjusting and forms mixed liquid, mother liquor filtering ponds subassembly is used for filtering mixed liquid.
Preferably, the first equalizing basin subassembly includes mother liquor equalizing basin and mother liquor pH equalizing basin, the mother liquor equalizing basin is used for adjusting the quality of water and the water yield of the mother liquor of emission, mother liquor pH equalizing basin is used for carrying out the alkaline regulation to the mother liquor after the mother liquor equalizing basin is adjusted.
Preferably, the mother liquor filter tank assembly comprises a plate-and-frame filter press, a first multi-media filter and a first ultrafiltration element, the plate-and-frame filter press is used for performing solid-liquid separation on the mixed liquor, the first multi-media filter is used for removing particulate matters and part of colloids in the mixed liquor after the solid-liquid separation, the first ultrafiltration element is used for removing colloids and organic matters in the wastewater treated by the first multi-media filter, and the produced water of the first ultrafiltration element is used for being introduced into the concentration unit for concentration.
Preferably, rinsing pretreatment of water unit includes second equalizing basin subassembly, high-efficient sedimentation tank, rinsing water filtering ponds subassembly and one-level reverse osmosis component, the second equalizing basin subassembly is used for carrying out quality of water regulation and alkaline regulation to the rinsing water, high-efficient sedimentation tank is used for realizing the deposit of metal impurities in the rinsing water after adjusting and forms the clear liquid, rinsing water filtering ponds subassembly is used for filtering the clear liquid, one-level reverse osmosis component is used for the warp clear liquid after rinsing water filtering ponds subassembly is handled carries out the one-level concentration, and lets in the concentration unit is concentrated.
Preferably, the second conditioning tank assembly comprises a rinse water conditioning tank for conditioning the quality and quantity of the discharged rinse water, and a rinse water pH conditioning tank for performing alkaline conditioning on the rinse water conditioned by the rinse water conditioning tank.
Preferably, the rinsing water filtering pool assembly comprises a second multi-media filter and a second ultrafiltration element, wherein the second multi-media filter is used for removing particles and part of colloid in the clear liquid, and the second ultrafiltration element is used for removing colloid and organic matters in the clear liquid treated by the second multi-media filter.
Preferably, the concentration unit comprises a concentrated water reverse osmosis element, a concentration reverse osmosis element and an evaporation and crystallization element, the concentrated water reverse osmosis element is used for mixing and concentrating the pretreated mother liquor and the pretreated rinsing water, the concentrated water after concentration is introduced into the concentration reverse osmosis element for secondary concentration, the evaporation and crystallization element is used for carrying out evaporation and crystallization on the concentrated water after secondary concentration, and condensate produced water of the concentrated water reverse osmosis element, the concentration reverse osmosis element and the evaporation and crystallization element can be introduced into the desalination unit.
Preferably, the desalination unit comprises an intermediate reverse osmosis element, a secondary reverse osmosis element and a tertiary reverse osmosis element, the intermediate reverse osmosis element can mix and desalt the produced water of each element in the concentration unit, the produced water of the intermediate reverse osmosis element can be introduced into the secondary reverse osmosis element for desalination, the produced water of the secondary reverse osmosis element can be introduced into the tertiary reverse osmosis element for desalination, and the produced water of the tertiary reverse osmosis element can be recycled.
The utility model discloses for prior art gain following technological effect:
the utility model provides a processing apparatus of ferric phosphate waste water, mother liquor pretreatment unit is used for collecting and the preliminary treatment the mother liquor that discharges, rinsing pretreatment of water unit is used for collecting and the preliminary treatment the rinsing water that discharges, carry out preliminary pretreatment to mother liquor and rinsing water, with the concentrated unit of protection, the concentrated unit is arranged in mixing and concentrating the mother liquor after the preliminary treatment and the rinsing water after the preliminary treatment, and the concentrate that the concentrated unit produced is used for the evaporation crystallization water, with retrieving the ammonium sulfate, ammonium phosphate and other products, the treatment effect is improved, the desalination unit is arranged in mixing and desalination to the product water of each component in the concentrated unit, with the production fresh water, the fresh water that the desalination unit produced can be retrieved, as the recycle-water, be used for the factory recycling, through the evaporation recovery of above-mentioned recycle-back, the factory of waste water and cleaner production's target, be favorable to improving water resource factory utilization, reduce the waste water discharge, reduce the water consumption, not only do benefit to the long-term economic development of enterprise, more be favorable to environmental protection and energy saving.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and 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 these drawings without creative efforts.
FIG. 1 is a flow chart of the treatment of an iron phosphate wastewater treatment apparatus according to the first embodiment;
FIG. 2 is a schematic view showing the structure of a ferric phosphate wastewater treatment apparatus according to the first embodiment;
in the figure: 100-mother liquor pretreatment unit, 101-mother liquor adjusting tank, 102-mother liquor pH adjusting tank, 103-mixed reaction tank, 104-plate-and-frame filter press, 105-first multi-media filter, 106-first ultrafiltration element, 200-rinsing water pretreatment unit, 201-rinsing water adjusting tank, 202-rinsing water pH adjusting tank, 203-high efficiency sedimentation tank, 204-second multi-media filter, 205-second ultrafiltration element, 206-first-stage reverse osmosis element, 300-concentration unit, 301-concentrated water reverse osmosis element, 302-concentration reverse osmosis element, 303-evaporative crystallization element, 400-desalination unit, 401-intermediate reverse osmosis element, 402-second-stage reverse osmosis element, 403-third-stage reverse osmosis element.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the 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.
The utility model aims at providing a processing apparatus of ferric phosphate waste water to solve the technical problem that current ferric phosphate waste water treatment effect is poor, resource utilization is low.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
Example one
As shown in fig. 1-2, the present embodiment provides a device for treating iron phosphate wastewater, which includes a mother liquor pretreatment unit 100, a rinsing water pretreatment unit 200, a concentration unit 300, and a desalination unit 400, wherein the mother liquor pretreatment unit 100 is configured to collect and pretreat discharged mother liquor, preliminarily pretreat the mother liquor and rinsing water to protect the concentration unit 300, the rinsing water pretreatment unit 200 is configured to collect and pretreat discharged rinsing water, the concentration unit 300 is configured to mix and concentrate the pretreated mother liquor and the pretreated rinsing water, and the concentrated solution generated by the concentration unit 300 is used to evaporate crystallization water to recover ammonium sulfate, ammonium phosphate, and other products, thereby improving treatment effect, the desalination unit 400 is configured to mix and desalt produced water of each element in the concentration unit 300 to generate fresh water, the fresh water generated by the desalination unit 400 can be recovered as recovered water, and is used for plant recycling, by the above design, thereby achieving the purposes of evaporation recovery of the concentrated solution, plant recycling and clean production of wastewater, and being beneficial to improving plant area desalination, reducing water discharge, reducing water resource, and being beneficial to environmental protection and being beneficial to long-saving enterprises.
Specifically, the mother liquor pretreatment unit 100 comprises a first adjusting tank assembly, a mixing reaction tank 103 and a mother liquor filtering tank assembly, and the designed treatment capacity of mother liquor pretreatment is 84m 3 The first adjusting tank assembly is used for adjusting the water quality and the water quantity and the alkalinity of the mother liquor to perform solid-liquid separation on the mother liquor, the mixed reaction tank 103 is used for mixing the adjusted mother liquor to form mixed liquor, and the mother liquor filtering tank assembly is used for filtering the mixed liquor to prevent the mother liquor from directly entering the concentration unit 300 and damaging the concentration unit 300.
The first regulating tank assembly comprises a mother liquor regulating tank 101 and a mother liquor pH regulating tank 102, the mother liquor regulating tank 101 is used for regulating the water quality and the water quantity of discharged mother liquor, the regulated mother liquor is introduced into the mother liquor pH regulating tank 102 through a lift pump, the mother liquor regulated by the mother liquor regulating tank 101 is subjected to alkaline regulation through the mother liquor pH regulating tank 102, the alkaline regulation is realized by adding a proper amount of ammonia water, the pH value is regulated to 8-9, the wastewater after the pH regulation enters a mixed reaction tank 103, and metal impurities in the wastewater are removed by utilizing the characteristic that most of the metal impurities are insoluble under the alkaline condition. The ammonia water is used, so that the final product can be sold as a nitrogen-phosphorus compound fertilizer, and the comprehensive cost is reduced.
The mother liquor filter tank assembly comprises a plate-and-frame filter press 104, a first multi-media filter 105 and a first ultrafiltration element 106, wherein the plate-and-frame filter press 104 is used for carrying out solid-liquid separation on mixed liquor, the plate-and-frame filter press 104 is a high-pressure membrane plate-and-frame filter press, the two filter presses are alternately used for guaranteeing the continuity of water inflow, filtrate is lifted to the first multi-media filter 105 through a lifting pump, the first multi-media filter 105 is used for removing fine particles in the mixed liquor after the solid-liquid separation, iron and manganese colloids in wastewater are removed at the same time, the operation stability of a subsequent membrane system is guaranteed, the wastewater is filtered by using different media, suspended matters and colloids in the wastewater are removed, but the removal capacity of the first multi-media filter 105 is limited, and the fine particles and the colloids in the wastewater cannot be isolated, therefore, the first ultrafiltration element 106 is additionally arranged in pretreatment, the first ultrafiltration element 106 is used for removing the colloids and larger organic matters in the wastewater treated by the first multi-media filter 105, the SDI value of the final pretreated effluent is guaranteed, the damage of the fine particles and the colloids on the subsequent reverse osmosis membrane is prevented, and the balance of the water produced by the ultrafiltration element 106 is concentrated in the ultrafiltration unit 300. The first ultrafiltration element 106 is an internal pressure type ultrafiltration membrane, which is advantageous in terms of heat resistance and alkali resistance compared to a conventional external pressure type ultrafiltration membrane.
The rinsing water pretreatment unit 200 includes a second conditioning tank assembly, an efficient sedimentation tank 203, a rinsing water filtering tank assembly, and a primary reverse osmosis element 206, and the rinsing water pretreatment design throughput is 450m 3 And the second regulating tank component is used for regulating the quality and quantity of the rinsing water and regulating the alkalinity of the rinsing water so as to separate the rinsing water from the liquid, the efficient sedimentation tank 203 is used for realizing the precipitation of metal impurities in the regulated rinsing water and forming clear liquid, the rinsing water filtering tank component is used for filtering the clear liquid so as to prevent the rinsing water from being directly introduced into the concentration unit 300 and damage the concentration unit 300, and the primary reverse osmosis element 206 is used for performing primary concentration (design recovery rate is 70-75%) on the clear liquid treated by the rinsing water filtering tank component and introducing the clear liquid into the concentration unit 300 for concentration. Because the salt content of the rinsing water of the ferric phosphate wastewater is greatly different from that of the mother liquor, the rinsing water pretreatment unit 200 is provided withA first-level reverse osmosis element 206 is added at an outlet to concentrate rinsing water, and concentrated water TDS and mother liquor are mixed after being similar to each other, so that fluctuation of a subordinate water inlet end due to overlarge water quality difference is avoided.
The second adjusting tank component comprises a rinsing water adjusting tank 201 and a rinsing water pH adjusting tank 202, the rinsing water adjusting tank 201 is used for adjusting the water quality and the water quantity of the discharged rinsing water, the rinsing water is lifted to the rinsing water pH adjusting tank 202 through a lifting pump, a proper amount of ammonia water is added to adjust alkalinity in the period, the pH value is adjusted to 8-9, the wastewater after pH adjustment enters an efficient sedimentation tank 203, so that metal impurities in the wastewater are removed by utilizing the characteristic that most of the metal impurities form precipitates under the alkaline condition, and clear liquid is lifted to the rinsing water filtering tank component through the lifting pump for further filtering.
The rinsing water filter tank component comprises a second multi-media filter 204 and a second ultrafiltration element 205, the second multi-media filter 204 is used for removing fine particles in clear liquid and iron and manganese colloids in water, the operation stability of a subsequent membrane system is guaranteed, and produced water enters the second ultrafiltration element 205 so as to remove the colloids and larger organic matters in wastewater again through the second ultrafiltration element 205 and protect the subsequent reverse osmosis membrane system.
The concentration unit 300 comprises a concentrated water reverse osmosis element 301, a concentration reverse osmosis element 302 and an evaporation crystallization element 303, wherein the concentrated water reverse osmosis element 301 is used for mixing and concentrating the pretreated mother liquor and the pretreated rinsing water (design recovery rate is 50% -55%), the concentrated water is introduced into the concentration reverse osmosis element 302 for secondary concentration (design recovery rate is 35% -40%), the TDS value of the concentration reverse osmosis element 302 is 160000mg/L, the evaporation crystallization element 303 is used for carrying out evaporation crystallization on the concentrated water after secondary concentration (design recovery rate is 90% -95%), and condensate produced water of the concentrated water reverse osmosis element 301, the concentration reverse osmosis element 302 and the evaporation crystallization element 303 can be introduced into the desalination unit 400.
The desalination unit 400 comprises a middle reverse osmosis element 401, a second-stage reverse osmosis element 402 and a third-stage reverse osmosis element 403, the middle reverse osmosis element 401 can mix and desalt the produced water of each element in the concentration unit 300 (the design recovery rate is 75% -90%), the produced water of the middle reverse osmosis element 401 can be introduced into the second-stage reverse osmosis element 402 for desalt and desalt (the design recovery rate is 75% -90%), the produced water of the second-stage reverse osmosis element 402 can be reused for production, and considering that the quality of the reverse osmosis produced water can be reduced along with the time, the third-stage reverse osmosis element 403 is designed, the produced water of the second-stage reverse osmosis element 402 is desalt and desalt (the design recovery rate is 75% -90%), and the produced water of the third-stage reverse osmosis element 403 can be recycled. The tertiary reverse osmosis element 403 is used when the water production index is insufficient, and the produced water is mixed with the secondary reverse osmosis produced water to ensure the quality of the pure water.
Example two
The embodiment provides a zero-emission treatment method for concentrating and recycling iron phosphate wastewater, and the water quality indexes before treatment are as follows:
| item | Mother liquor | Rinsing water |
| Water temperature (. Degree.C.) | 30-35 | 30-35 |
| pH | 2.0-2.5 | 2.2-2.5 |
| Total P, mg/L | 2200～3000 | 200～400 |
| NH 3 -N，mg/L | 6000～7000 | 1500～2000 |
| SO 4 2- ，mg/L | 50000～60000 | 3000～4000 |
| Na + ，mg/L | 30～50 | ≦20 |
| Ca 2+ ，mg/L | 30～50 | ≦20 |
| Mg 2+ ，mg/L | 500～700 | 30～50 |
| Mn 2+ ，mg/L | 80～100 | ≦30 |
| Fe 2+ ，mg/L | 30～50 | ≦30 |
| F - ，mg/L | 30～50 | ≦20 |
| TDS，mg/L | 55000～65000 | 12000～15000 |
| COD，mg/L | ≦60 | ≦20 |
Considering the water consumption situation of iron phosphate manufacturing enterprises comprehensively, the treatment process of the embodiment treats the wastewater, the conductivity of the desalted produced water is less than or equal to 10 mus/cm, and the pH value is as follows: 6-7, and can be used as water for producing iron phosphate. The concentrated solution meets the condition that TDS is more than or equal to 160000, the water content after evaporation and crystallization is less than or equal to 5 percent, an evaporation and crystallization system comprises an ammonium sulfate and ammonium phosphate packaging device, the concentrated solution can be sold as a product, and the overall economic benefit is good.
This example is specifically as follows:
1. the design throughput of the mother liquor pretreatment unit 100 is 84m 3 Firstly adjusting the water quality and the water quantity through a mother liquor adjusting tank 101, then lifting the mother liquor adjusting tank to a mother liquor pH adjusting tank 102 through a lift pump, adjusting the alkalinity through adding a proper amount of ammonia water (2000-2500 ppm according to the water quality fluctuation), feeding the wastewater after adjusting the pH (8-9) into a mixing reaction tank 103, adding a proper amount of PAM (1-5 ppm according to the water quality fluctuation), and arranging variable frequency speed adjusting motors, remote transmission instruments and flow adjusting valves on the medicine adding modules, wherein the regulation can be carried out automatically according to the water quality fluctuation. Under the alkaline condition, metal impurities in the wastewater are removed by utilizing the characteristic that most of the metal impurities are insoluble, the mixed liquor is subjected to solid-liquid separation through a plate-and-frame filter press 104, filtrate is lifted to a first multi-media filter 105 (three tanks with the designed diameter of 3000 mm) through a lifting pump, fine particles in the wastewater are further removed, iron and manganese colloids in the wastewater are simultaneously removed to ensure the operation stability of a subsequent membrane system, produced water enters a first ultrafiltration element 106, colloids and larger organic matters in the wastewater are removed again, the subsequent reverse osmosis membrane system is protected, the ultrafiltered produced water enters a first-stage reverse osmosis element 206 concentrated water tank, the whole design of the project is zero discharge, backwash water and drainage of the first multi-media filter 105 and the first ultrafiltration element 106 flow back to a mother liquor adjusting tank 101, and the treatment capacity of the system is 100m after water balance calculation 3 /h。
2. Designed treatment for pretreatment of rinsing waterThe amount is 450m 3 Adjusting the water quality and the water quantity through a rinsing water adjusting tank 201, lifting the water to a rinsing water pH adjusting tank 202 through a lift pump, adjusting the alkalinity through adding a proper amount of ammonia water (according to water quality fluctuation of 1500-2000 ppm), enabling the wastewater with the pH adjusted (8-9) to enter a high-efficiency sedimentation tank 203, and adding a proper amount of PAM (according to water quality fluctuation of 1-3 ppm) in the process. The dosing modules are all provided with a variable frequency speed regulating motor, a remote transmission instrument and a flow regulating valve, and can be automatically regulated according to water quality fluctuation. Removing metal impurities in the wastewater by utilizing the characteristic that most of the metal impurities form precipitates under an alkaline condition, lifting clear liquid to a second multi-medium filter 204 through a lifting pump, further removing fine particles in the wastewater, simultaneously removing iron and manganese colloids in the wastewater to ensure the operation stability of a subsequent membrane system, enabling produced water to enter a second ultrafiltration element 205, removing colloids and larger organic matters in the wastewater again, and protecting the subsequent reverse osmosis membrane system; the whole design of the project is zero discharge, backwash water and drainage water of the second multi-media filter 204 and the second ultrafiltration element 205 flow back to the rinse water regulating tank 201, and the treatment capacity of the system is 500m after water balance calculation 3 H is used as the reference value. The water produced by ultrafiltration after pretreatment enters a first-stage reverse osmosis element 206, the first-stage reverse osmosis element 206 adopts a two-stage design, a high-desalination special membrane element is used, the desalination rate can reach 97-98.5%, a variable-frequency speed-regulating high-pressure pump is designed, the operating pressure is 30bar, the recovery rate is designed to be adjusted between 70-75%, the system is designed to realize concentrated water reflux, and the flow can be adjusted between 0-70m through a valve 3 And adjusting between/h. The final stage reverse osmosis element 206 produced water as follows: na (Na) + ：0.2mg/L，Mg 2+ ：0.01mg/L，NH 4+ ：35mg/L，PO 4 3- ：5mg/L，SO 4 2- :88mg/L, TDS-128 mg/L. The concentrated water indexes are as follows: na (Na) + ：74mg/L，Mg 2+ ：6mg/L，NH 4 + ：13975mg/L，PO 4 3- ：1727mg/L，SO 4 2- ：35017mg/L，TDS～50000-55000mg/L。
3. The concentrated water mixed mother liquor of the first-stage reverse osmosis element 206 is pretreated to discharge water, and then is concentrated by a concentrated water reverse osmosis element 301, the concentrated water reverse osmosis element adopts a two-stage design, and high desalination rate is usedThe desalination rate of the special membrane element can reach 97-98.5%, a variable-frequency speed-regulating high-pressure pump is designed, the operating pressure is 60bar, the recovery rate is designed to be regulated between 50-55%, the system is designed to realize concentrated water reflux, and the flow can be 0-15m through a valve 3 The adjustment is carried out between/h, the energy recovery is designed for concentrated water, the cost of the high-pressure pump is reduced, and the economical efficiency of the system is enhanced. The water production index of the final concentrated water reverse osmosis element 301 is as follows: na (Na) + ：0.6mg/L，Mg 2+ ：0.2mg/L，NH 4 + ：153mg/L，PO 4 3- ：30mg/L，SO 4 2- :364mg/L, TDS-547 mg/L. The concentrated water indexes are as follows: na (Na) + ：112mg/L，Mg 2+ ：27mg/L，NH 4 + ：30298mg/L，PO 4 3- ：5843mg/L，SO 4 2- ：72332mg/L，TDS～100000-110000mg/L。
4. Concentrated water of the concentrated water reverse osmosis element 301 enters the concentration reverse osmosis element 302 for secondary concentration, the concentration reverse osmosis element 302 adopts a two-stage design, an ultrahigh pressure special membrane element is used, the desalination rate is not less than 98%, a variable-frequency speed-regulating high-pressure pump is designed, the operating pressure is 98bar, the recovery rate is designed to be adjusted between 35% and 40%, the system is designed to realize concentrated water backflow, and the flow can be adjusted to be 0-15m through a valve 3 The adjustment is carried out between/h, the energy recovery is designed for concentrated water, the cost of the high-pressure pump is reduced, and the economical efficiency of the system is enhanced. The water production index of the final concentration reverse osmosis device is as follows: na (Na) + ：1mg/L，Mg 2+ ：0.3mg/L，NH 4 + ：300mg/L，PO 4 3- ：60mg/L，SO 4 2- :724mg/L, TDS-1100 mg/L. The concentrated water indexes are as follows: na (Na) + ：170mg/L，Mg 2+ ：42mg/L，NH 4 + ：46449mg/L，PO 4 3- ：8958mg/L，SO 4 2- :110000mg/L, TDS-160000-170000 mg/L. The concentrated water enters evaporation crystallization (the designed recovery rate is 90-95%).
5. The produced water (TDS-700 mg/L) of the condensate of the concentrated water reverse osmosis element 301, the concentration reverse osmosis element 302 and the evaporation crystallization element 303 is mixed with the concentrated water of the secondary reverse osmosis element 402 and then treated by the middle reverse osmosis element 401. The middle reverse osmosis element 401 adopts a two-stage design and has high use heightThe desalination rate of the membrane element with low energy consumption is more than or equal to 98 percent, a variable-frequency speed-regulating high-pressure pump is designed, the operating pressure is 6.8bar, the recovery rate is designed to be adjusted between 75 percent and 90 percent, and finally the water production index of the intermediate reverse osmosis element 401 is as follows: na (Na) + ：0.02mg/L，NH 4 + ：6mg/L，PO 4 3- ：0.7mg/L，SO 4 2- :14mg/L and TDS-20 mg/L. The concentrated water indexes are as follows: na (Na) + ：4mg/L，Mg 2+ ：0.7mg/L，NH 4 + ：1172mg/L，PO 4 3- ：153mg/L，SO 4 2- ：2862mg/L，TDS～4000-4500mg/L。
6. The produced water of the middle reverse osmosis element 401 enters a second-stage reverse osmosis element 402, the second-stage reverse osmosis element 402 adopts a two-stage design, a membrane element with high desalination rate and low energy consumption is used, the desalination rate is more than or equal to 98%, a variable-frequency speed-regulating high-pressure pump is designed, the operating pressure is 6.1bar, the recovery rate is designed to be adjusted between 75% and 90%, and finally the water production index of the second-stage reverse osmosis element 402 is as follows: NH 4 + ：1mg/L，PO 4 3- ：0.1mg/L，SO 4 2- :1.7mg/L, TDS-2.8 mg/L. The concentrated water indexes are as follows: na (Na) + ：1mg/L，Mg 2+ ：0.06mg/L，NH 4 + ：151mg/L，PO 4 3- ：19mg/L，SO 4 2- :377mg/L, TDS 450-600mg/L. The secondary reverse osmosis element 402 produces water for reuse in production.
7. Considering that the quality of produced water is reduced along with the time, the second-stage reverse osmosis element 402 is designed to be added with a third-stage reverse osmosis element 403, the third-stage reverse osmosis element 403 adopts a two-stage design, and a membrane element with high desalination rate and low energy consumption is used, so that the desalination rate is as follows: 90% -95%, designing a variable-frequency speed-regulating high-pressure pump, regulating the operating pressure to 5.5bar, regulating the recovery rate to 75% -90%, and finally regulating the water production indexes of the three-stage reverse osmosis element 403 as follows: NH 4 + ：0.05mg/L，PO 4 3- ：0.01mg/L，SO 4 2- :0.13mg/L, TDS-0.2 mg/L. The concentrated water indexes are as follows: na (Na) + ：0.02mg/L，NH 4 + ：4.34mg/L，PO 4 3- ：0.54mg/L，SO 4 2- ：11mgand/L, TDS-16 mg/L. The tertiary reverse osmosis element 403 is used when the water production index is insufficient, and mixes the produced water with the produced water of the secondary reverse osmosis element 402 to ensure the quality of the pure water.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for those skilled in the art, the idea of the present invention may be changed in the specific embodiments and the application range. In summary, the content of the present description should not be construed as a limitation of the present invention.
Claims (9)
1. The utility model provides a processing apparatus of ferric phosphate waste water which characterized in that: the device comprises a mother liquor pretreatment unit, a rinsing water pretreatment unit, a concentration unit and a desalination unit, wherein the mother liquor pretreatment unit is used for collecting and pretreating discharged mother liquor, the rinsing water pretreatment unit is used for collecting and pretreating discharged rinsing water, the concentration unit is used for mixing and concentrating pretreated mother liquor and pretreated rinsing water, concentrated liquid generated by the concentration unit is used for evaporating crystallization water, the desalination unit is used for mixing and desalting produced water of each element in the concentration unit, and fresh water generated by the desalination unit can be recovered.
2. The apparatus for treating iron phosphate wastewater according to claim 1, characterized in that: the mother liquor pretreatment unit comprises a first regulating reservoir component, a mixed reaction tank and a mother liquor filtering reservoir component, wherein the first regulating reservoir component is used for regulating the water quality and the water quantity and regulating the alkalinity of the mother liquor, the mixed reaction tank is used for mixing the regulated mother liquor to form mixed liquor, and the mother liquor filtering reservoir component is used for filtering the mixed liquor.
3. The apparatus for treating iron phosphate wastewater according to claim 2, wherein: the first equalizing basin subassembly includes mother liquor equalizing basin and mother liquor pH equalizing basin, the mother liquor equalizing basin is used for adjusting the quality of water and the water yield of the mother liquor of emission, the mother liquor pH equalizing basin is used for the warp the mother liquor after the mother liquor equalizing basin is adjusted carries out alkaline regulation.
4. The apparatus for treating iron phosphate wastewater according to claim 2, wherein: the mother liquor filter tank component comprises a plate-and-frame filter press, a first multi-media filter and a first ultrafiltration element, the plate-and-frame filter press is used for carrying out solid-liquid separation on mixed liquor, the first multi-media filter is used for removing particulate matters and part of colloids in the mixed liquor after the solid-liquid separation, the first ultrafiltration element is used for removing colloids and organic matters in wastewater treated by the first multi-media filter, and produced water of the first ultrafiltration element is used for being introduced into the concentration unit for concentration.
5. The apparatus for treating iron phosphate wastewater according to claim 1, characterized in that: rinsing pretreatment of water unit includes second equalizing basin subassembly, high-efficient sedimentation tank, rinsing water filtering ponds subassembly and one-level reverse osmosis component, the second equalizing basin subassembly is used for carrying out quality of water regulation and alkaline regulation to the rinsing water, high-efficient sedimentation tank is used for realizing the deposit of metal impurities in the rinsing water after the regulation and forms the clear liquid, rinsing water filtering ponds subassembly is used for filtering the clear liquid, one-level reverse osmosis component is used for the warp the clear liquid after rinsing water filtering ponds subassembly is handled carries out the one-level concentration, and lets in the concentration unit is concentrated.
6. The apparatus for treating iron phosphate wastewater according to claim 5, wherein: the second adjusting tank component comprises a rinsing water adjusting tank and a rinsing water pH adjusting tank, the rinsing water adjusting tank is used for adjusting the water quality and the water quantity of the discharged rinsing water, and the rinsing water pH adjusting tank is used for carrying out alkaline adjustment on the rinsing water adjusted by the rinsing water adjusting tank.
7. The apparatus for treating iron phosphate wastewater according to claim 5, characterized in that: the rinsing water filter tank component comprises a second multi-media filter and a second ultrafiltration element, wherein the second multi-media filter is used for removing particles and part of colloids in the clear liquid, and the second ultrafiltration element is used for removing the colloids and organic matters in the clear liquid treated by the second multi-media filter.
8. The apparatus for treating iron phosphate wastewater according to claim 1, wherein: the concentration unit comprises a concentrated water reverse osmosis element, a concentration reverse osmosis element and an evaporation crystallization element, the concentrated water reverse osmosis element is used for mixing and concentrating the pretreated mother liquor and the pretreated rinsing water, the concentrated water is introduced into the concentration reverse osmosis element for secondary concentration, the evaporation crystallization element is used for carrying out evaporation crystallization on the concentrated water after secondary concentration, and condensate produced water of the concentrated water reverse osmosis element, the concentration reverse osmosis element and the evaporation crystallization element can be introduced into the desalination unit.
9. The apparatus for treating iron phosphate wastewater according to claim 1, characterized in that: the desalination unit includes middle reverse osmosis component, second grade reverse osmosis component and tertiary reverse osmosis component, middle reverse osmosis component can be right the product water of each component mixes and desalination in the concentration unit, the product water of middle reverse osmosis component can let in carry out the desalination in the second grade reverse osmosis component, the product water of second grade reverse osmosis component can let in carry out the desalination in the tertiary reverse osmosis component, just the product water of tertiary reverse osmosis component can be recycled.
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| CN202222516465.5U CN218403895U (en) | 2022-09-22 | 2022-09-22 | Iron phosphate wastewater treatment device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115991560A (en) * | 2023-03-22 | 2023-04-21 | 深圳永清水务有限责任公司 | Treatment method for recycling iron phosphate production wastewater |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115991560A (en) * | 2023-03-22 | 2023-04-21 | 深圳永清水务有限责任公司 | Treatment method for recycling iron phosphate production wastewater |
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