CN110746009A - Method and device for improving treatment effect of ammonium nitrate electrodialysis water - Google Patents
Method and device for improving treatment effect of ammonium nitrate electrodialysis water Download PDFInfo
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- CN110746009A CN110746009A CN201911067224.3A CN201911067224A CN110746009A CN 110746009 A CN110746009 A CN 110746009A CN 201911067224 A CN201911067224 A CN 201911067224A CN 110746009 A CN110746009 A CN 110746009A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 46
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 238000000909 electrodialysis Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000000694 effects Effects 0.000 title claims abstract description 19
- 238000001914 filtration Methods 0.000 claims abstract description 73
- 239000000110 cooling liquid Substances 0.000 claims abstract description 69
- 239000007788 liquid Substances 0.000 claims abstract description 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052742 iron Inorganic materials 0.000 claims abstract description 25
- -1 iron ions Chemical class 0.000 claims abstract description 22
- 229960004887 ferric hydroxide Drugs 0.000 claims abstract description 15
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 claims abstract description 15
- 239000002244 precipitate Substances 0.000 claims abstract description 13
- 238000003860 storage Methods 0.000 claims description 52
- 238000006386 neutralization reaction Methods 0.000 claims description 31
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 25
- 229910052748 manganese Inorganic materials 0.000 claims description 25
- 239000011572 manganese Substances 0.000 claims description 25
- 239000004576 sand Substances 0.000 claims description 25
- 239000000919 ceramic Substances 0.000 claims description 20
- 238000005406 washing Methods 0.000 claims description 9
- 238000004064 recycling Methods 0.000 claims description 7
- 239000012528 membrane Substances 0.000 abstract description 22
- 239000002351 wastewater Substances 0.000 abstract description 11
- 238000012423 maintenance Methods 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 239000003344 environmental pollutant Substances 0.000 abstract description 3
- 231100000719 pollutant Toxicity 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 description 23
- 239000000758 substrate Substances 0.000 description 14
- 238000000108 ultra-filtration Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 7
- 230000009466 transformation Effects 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000005370 electroosmosis Methods 0.000 description 5
- 238000001556 precipitation Methods 0.000 description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 239000004088 foaming agent Substances 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- 238000011001 backwashing Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000009287 sand filtration Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000003657 drainage water Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000036284 oxygen consumption Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
Abstract
The invention discloses a method and a device for improving the treatment effect of ammonium nitrate electrodialysis water, wherein the method mainly comprises the following steps: converting divalent and trivalent iron ions in the surface cooling liquid into ferric hydroxide precipitate through a first-stage filtering unit to obtain treated surface cooling liquid; and (4) further filtering the surface cooling liquid at a nanometer level through a second-stage filtering unit, and meanwhile, outputting clear liquid to a first-stage source liquid tank for subsequent electrodialysis treatment. This is disclosed handles the pollutant in the ammonium nitrate waste water before getting into the membrane stack, realizes the nanometer and clears away, not only improves the effect of original ammonium nitrate electrodialysis water treatment, does not have extra pollution discharge moreover, and can: the service life of the original device is prolonged, and the maintenance cost is reduced, thereby realizing economic and environmental protection benefits.
Description
Technical Field
The invention belongs to the technical field of ammonium nitrate wastewater treatment, and particularly relates to a method for improving the treatment effect of ammonium nitrate electrodialysis water.
Background
In the existing domestic operating ammonium nitrate device, the generated wastewater contains trace iron ions, rust and foaming agent macromolecular organic matters added in part of the production process due to trace corrosion of equipment and secondary recovery of washing liquid returned to a primary evaporator in the production process.
At present, the relatively mature domestic ammonium nitrate (also called ammonium nitrate) wastewater treatment is electrodialysis membrane stack treatment, the device only designs wire winding, melt-blowing and ceramic three-stage filtration, the filtration precision is 3 microns, and the requirement of production cannot be met; in addition, in the water treatment process, rust and foaming agent can slowly gather on the surface of the electrodialysis membrane stack and even permeate into the membrane stack, so that the treatment capacity and effect of the membrane stack are sharply reduced, even the treatment capacity is not high, and the phenomenon that the current is increased and then the polar plate is burnt is caused.
In order to remove the sundries deposited on the surface of the membrane stack, the electrodialysis membrane stack can only be forcedly and periodically disassembled for manual mechanical cleaning, and as a result, the use effect in a short time can be met after cleaning, but the service life of the membrane stack is damaged due to manual cleaning, so that the operation period is greatly shortened, and the device operation of a production enterprise is greatly disturbed under the condition at present.
However, the electroosmosis water treatment has high device investment cost when treating the ammonium nitrate wastewater, and the problem results in that the ammonium nitrate electrodialysis related device needs to replace and treat part of the positive membrane and the negative membrane of the membrane stack every year: the maintenance cost is up to 50 ten thousand per year according to the calculation of treating 30t of waste water per hour, the operation period is continuously reduced, 600 ten thousand are required to be invested again for all replacement, and the heavy economic burden is brought to a waste water treatment party.
That is to say, the membrane stack of the existing ammonium nitrate electrodialysis water treatment device is affected by iron ions, iron filings, macromolecular organic matters of foaming agent and the like in water, and is deposited on the surface of the membrane stack, even enters the inside of the membrane to cause the blockage of an ion migration channel, thereby: on one hand, the exchange capacity and the desalination rate are influenced, so that membrane pollution is caused, and the treatment effect of an electrodialysis membrane stack is greatly influenced; on the other hand, the life of the electrodialysis membrane stack is also greatly influenced, which leads to heavy maintenance costs.
Therefore, a technical solution for improving the treatment effect of the ammonium nitrate electrodialysis water is needed, and the related maintenance cost can be reduced.
Disclosure of Invention
In view of the above problems, the present disclosure provides a method for improving the treatment effect of ammonium nitrate electrodialysis water, comprising the following steps:
s100: conveying the surface cooling liquid to a first-stage filtering unit through a first-stage lift pump unit;
s200: converting divalent and trivalent iron ions in the surface cooling liquid into ferric hydroxide precipitate through a first-stage filtering unit to obtain treated surface cooling liquid, wherein the first-stage filtering unit is further connected with an input port of a first storage tank to store the treated surface cooling liquid, and an output port of the first storage tank is further connected with a second-stage lift pump unit;
s300: conveying the treated surface cooling liquid in the first storage tank to a cooler through a second-stage lifting pump unit; the cooler is sequentially conveyed to the first precision filter, the second precision filter and the ceramic filter after being cooled;
s400: the second-stage filtering unit is connected with an output port of the ceramic filter, so that the surface cooling liquid is further filtered in a nanometer level, and meanwhile, clear liquid is output to the first-stage source liquid tank; and the clear liquid stored in the primary source liquid tank is further used for subsequent electrodialysis treatment.
More preferably, it is a mixture of more preferably,
the first-stage lift pump unit comprises a first lift pump and a second lift pump and is used for conveying the surface cooling liquid to the first-stage filtering unit through the first lift pump and the second lift pump.
More preferably, it is a mixture of more preferably,
the first-stage filtering unit comprises a manganese sand filter, and is used for converting divalent and trivalent iron ions in the surface cooling liquid into ferric hydroxide precipitate to obtain the surface cooling liquid treated by the manganese sand filter, and the manganese sand filter is further connected with an input port of the first storage tank.
More preferably, it is a mixture of more preferably,
the second-stage lift pump unit comprises a third lift pump and a fourth lift pump and is used for conveying the treated surface cooling liquid in the first storage tank to a cooler through the third lift pump and the fourth lift pump.
More preferably, it is a mixture of more preferably,
the second-stage filtering unit comprises a security filter and an UF filter which are connected in sequence, wherein an output port of the ceramic filter is connected with an input port of the security filter.
More preferably, it is a mixture of more preferably,
and the second-stage filtering unit also outputs concentrated solution for recycling ammonium nitrate to a second storage tank, and an output port of the second storage tank is further connected with the ammonium nitrate storage tank.
More preferably, it is a mixture of more preferably,
the first-stage lift pump unit is connected with the surface cooling liquid through a washing condensate pump and a neutralization tank in sequence.
More preferably, it is a mixture of more preferably,
the first lift pump and the second lift pump are used alternately.
More preferably, it is a mixture of more preferably,
the third lift pump and the fourth lift pump are used alternately.
More preferably, it is a mixture of more preferably,
the neutralization tank comprises a first neutralization tank and a second neutralization tank which are alternately used.
Further, according to another aspect of the present disclosure, there is provided an apparatus for improving an effect of water treatment for ammonium nitrate electrodialysis, the apparatus comprising: the device comprises a first-stage lift pump unit, a first-stage filtering unit, a first storage tank, a second-stage lift pump unit and a second-stage filtering unit;
the first-stage lift pump unit is used for conveying the surface cooling liquid to the first-stage filtering unit through the lift pump unit;
the first-stage filtering unit is used for converting divalent and trivalent iron ions in the surface cooling liquid into ferric hydroxide precipitate to obtain treated surface cooling liquid, the first-stage filtering unit is further connected with an input port of a first storage tank to store the treated surface cooling liquid, and an output port of the first storage tank is further connected with a second-stage lift pump unit;
the second-stage lift pump unit is used for conveying the treated surface cooling liquid in the first storage tank to a cooler through the second-stage lift pump unit; the cooler is sequentially conveyed to the first precision filter, the second precision filter and the ceramic filter after being cooled;
the second-stage filtering unit is used for being connected with an output port of the ceramic filter so as to further filter the surface cooling liquid at a nanometer level and output clear liquid to the first-stage source liquid tank; and the clear liquid stored in the primary source liquid tank is further used for subsequent electrodialysis treatment.
More preferably, it is a mixture of more preferably,
the first-stage lift pump unit comprises a first lift pump and a second lift pump and is used for conveying the surface cooling liquid to the first-stage filtering unit through the first lift pump and the second lift pump.
More preferably, it is a mixture of more preferably,
the first-stage filtering unit comprises a manganese sand filter, and is used for converting divalent and trivalent iron ions in the surface cooling liquid into ferric hydroxide precipitate to obtain the surface cooling liquid treated by the manganese sand filter, and the manganese sand filter is further connected with an input port of the first storage tank.
More preferably, it is a mixture of more preferably,
the second-stage lift pump unit comprises a third lift pump and a fourth lift pump and is used for conveying the treated surface cooling liquid in the first storage tank to a cooler through the third lift pump and the fourth lift pump.
More preferably, it is a mixture of more preferably,
the second-stage filtering unit comprises a security filter and an UF filter which are connected in sequence, wherein an output port of the ceramic filter is connected with an input port of the security filter.
More preferably, it is a mixture of more preferably,
and the second-stage filtering unit also outputs concentrated solution for recycling ammonium nitrate to a second storage tank, and an output port of the second storage tank is further connected with the ammonium nitrate storage tank.
More preferably, it is a mixture of more preferably,
the first-stage lift pump unit is connected with the surface cooling liquid through a washing condensate pump and a neutralization tank in sequence.
More preferably, it is a mixture of more preferably,
the apparatus alternates use of the first lift pump and the second lift pump.
More preferably, it is a mixture of more preferably,
the apparatus alternates use of the third lift pump and the fourth lift pump.
More preferably, it is a mixture of more preferably,
the neutralization tank comprises a first neutralization tank and a second neutralization tank which are alternately used.
Compared with the prior art, the beneficial effect of this disclosure is:
pollutants in the ammonium nitrate wastewater are treated before entering the membrane stack, so that the nanoscale removal is realized, the original effect of the ammonium nitrate electrodialysis water treatment is improved, no extra pollution is caused, and the method can: the service life of the original device is prolonged, and the maintenance cost is reduced, thereby realizing economic and environmental protection benefits.
Drawings
FIG. 1 is a schematic diagram of a method according to one embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of an apparatus for operating the method in one embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some embodiments of the present disclosure, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
In one embodiment, the present disclosure provides a method for improving the effect of water treatment for ammonium nitrate electrodialysis, comprising the steps of:
s100: conveying the surface cooling liquid to a first-stage filtering unit through a first-stage lift pump unit;
s200: converting divalent and trivalent iron ions in the surface cooling liquid into ferric hydroxide precipitate through a first-stage filtering unit to obtain treated surface cooling liquid, wherein the first-stage filtering unit is further connected with an input port of a first storage tank to store the treated surface cooling liquid, and an output port of the first storage tank is further connected with a second-stage lift pump unit;
s300: conveying the treated surface cooling liquid in the first storage tank to a cooler through a second-stage lifting pump unit; the cooler is sequentially conveyed to the first precision filter, the second precision filter and the ceramic filter after being cooled;
s400: the second-stage filtering unit is connected with an output port of the ceramic filter, so that the surface cooling liquid is further filtered in a nanometer level, and meanwhile, clear liquid is output to the first-stage source liquid tank; and the clear liquid stored in the primary source liquid tank is further used for subsequent electrodialysis treatment.
For the above embodiment, the key is: firstly, the conversion and the precipitation of bivalent and trivalent iron ions in surface cooling liquid to ferric hydroxide are realized through the first-stage filtering unit, secondly, the nanoscale filtration is realized through the second-stage filtering unit, and thirdly, the first-stage lift pump unit and the second-stage lift pump unit are specially designed for facilitating the normal work of the first-stage filtering unit and the second-stage filtering unit. It should be noted that the first storage tank, the cooler, the first precision filter and the second precision filter belong to the prior art related devices for electro-dialysis water treatment, and the ingenuity of the embodiment lies in that in the process of operating the prior related devices, new units are inserted into different positions of the corresponding devices and a series of actions/steps are executed, so that the prior related devices can be fully utilized and a new process method is realized, namely: the scheme of this embodiment is a transformation scheme, and the transformation cost is controllable.
In another embodiment of the present invention, the substrate is,
the first-stage lift pump unit comprises a first lift pump and a second lift pump and is used for conveying the surface cooling liquid to the first-stage filtering unit through the first lift pump and the second lift pump.
It is to be understood that this embodiment is one specific implementation of a first stage lift pump unit. On the premise of meeting the transformation target, if only one lifting pump is adopted to effectively convey the surface cooling liquid to the first-stage filtering unit, then one lifting pump can also be adopted. Generally, it is preferred to use two lift pumps.
In another embodiment of the present invention, the substrate is,
the first-stage filtering unit comprises a manganese sand filter, and is used for converting divalent and trivalent iron ions in the surface cooling liquid into ferric hydroxide precipitate to obtain the surface cooling liquid treated by the manganese sand filter, and the manganese sand filter is further connected with an input port of the first storage tank.
For this example, the conversion and precipitation of the corresponding iron ions was achieved by means of a manganese sand filter.
In another embodiment of the present invention, the substrate is,
the second-stage lift pump unit comprises a third lift pump and a fourth lift pump and is used for conveying the treated surface cooling liquid in the first storage tank to a cooler through the third lift pump and the fourth lift pump.
Similar to the first stage lift pump unit described above, it is preferred that the second stage lift pump unit also employs two lift pumps. If possible, a lift pump may also be used.
In another embodiment of the present invention, the substrate is,
the second-stage filtering unit comprises a security filter and an UF filter which are connected in sequence, wherein an output port of the ceramic filter is connected with an input port of the security filter.
It can be understood that the use of a security filter and an UF filter (note: the UF filter is simply referred to as UF ultrafiltration apparatus, or further simply referred to as ultrafiltration) connected in series is one embodiment of achieving nano-scale filtration.
In another embodiment of the present invention, the substrate is,
and the second-stage filtering unit also outputs concentrated solution for recycling ammonium nitrate to a second storage tank, and an output port of the second storage tank is further connected with the ammonium nitrate storage tank.
For this example, it further shows that: compared with the prior art, the method has better recycling capability, and the economic and environmental benefits of the method are further improved.
In another embodiment of the present invention, the substrate is,
the first-stage lift pump unit is connected with surface cooling liquid through a washing condensate pump and a neutralization tank in sequence.
It should be noted that the washing condensate pump and the neutralization tank belong to the related devices of the existing electroosmosis water treatment, which further highlights that the related devices of the existing electroosmosis water treatment can be fully utilized by the present disclosure.
In another embodiment of the present invention, the substrate is,
the first lift pump and the second lift pump are used alternately.
More preferably, it is a mixture of more preferably,
the third lift pump and the fourth lift pump are used alternately.
More preferably, it is a mixture of more preferably,
the neutralization tank comprises a first neutralization tank and a second neutralization tank which are alternately used.
For the different embodiments described above, which involve alternating use of the associated lift pump and neutralization tank, this is all to increase the efficiency of use of the lift pump or neutralization tank. In addition, the alternate use can also play a redundant backup role: in the extreme case, when one of the lift pumps or neutralization tanks fails, the other can be temporarily used for water treatment.
With reference to fig. 1, a more detailed embodiment is illustrated, which employs not only the first and second lift pumps, i.e. lift pumps a and B, but also the third and fourth lift pumps, and which are of exactly the same specifications as lift pumps a and B, respectively, while making the most possible use of: the original first and second neutralization tanks, i.e., neutralization tank a and neutralization tank B, and: the original first and second fine filters, i.e., fine filters a and B, and the original ceramic filter. In this embodiment, neutralization tank a corresponds to lift pump a and neutralization tank B corresponds to lift pump B, all of which can be used alternately as described above. It should be noted that, in this embodiment, the manganese sand filter and the UF filter further include an input port into which electrodialysis-qualified water is supplied so as to be used as backwash water, and in this case, the manganese sand filter and the UF filter further include an output port from which washing-drainage water is discharged. In addition, in order to facilitate the conversion of divalent and trivalent iron ions, the manganese sand filter can additionally mix air into the electrodialysis qualified water when the electrodialysis qualified water is introduced.
In another embodiment, the cartridge filter is of the 5 micron or even 1 micron filtration class.
In another embodiment, the UF filter is on the order of 0.002 microns, i.e., 2 nanometers. And better, a finer nanometer level can be achieved.
In another embodiment, the first fine filter is a wire-wound cartridge filter and the second fine filter is a melt blown cartridge filter.
The following table 1 shows the analysis and detection results of water treatment according to the technical scheme disclosed by the present disclosure:
| analyzing test items | Unit of | Requirement index | Measured index |
| Temperature of water | ℃ | 5～40 | 20 |
| Free chlorine | mg/L | <0.2 | Reach the standard |
| Oxygen consumption | mg/L | <3 | Reach the standard |
| Iron | mg/L | <0.3 | Reach the standard |
| Manganese oxide | mg/L | <0.1 | Reach the standard |
| Turbidity of water | NTU | <1 | Reach the standard |
| Pollution index (SDI) | <10 | Reach the standard |
That is, under the condition that the whole process flow of the original system is not changed, a manganese sand filter is additionally arranged at an inlet of a first storage tank, namely an inlet of a condensate buffer storage tank, divalent and trivalent iron ions in surface cooling liquid are finally converted into ferric hydroxide precipitate to remove iron ions and suspended matters in the wastewater, then the wastewater treated by a first-stage filtering unit (such as the manganese sand filter) enters a cooler to be cooled, and then enters a second-stage filtering unit (particularly an UF ultrafiltration filter) newly added in the disclosure after being subjected to three-stage filtering of an original wire winding (a first precision filter), a melt-blown (a second precision filter) and a ceramic filter to further treat iron rust and high molecular organic matters contained in the wastewater, so that the turbidity of the wastewater is reduced to be below 0.2 NTU; the backwashing water at the manganese sand filter and the UF filter can also be backwashed by adopting final qualified water, and the water after regular backwashing can enter another emergency pool. Returning the second storage tank (which can be an original first-stage concentrated solution tank) finally entering the ammonium nitrate electrodialysis into a neutralization washing tower of an ammonium nitrate system for recovery and entering an ammonium nitrate storage tank; concentrated water obtained by ultrafiltration of the UF filter can also enter the emergency pool, and can be reprocessed by a supernatant reflux system after final precipitation in the emergency pool, and the concentrated water and backwash water are completely processed in the ammonium nitrate device in the processing process, so that the method has no outward discharge and does not bring new processing load to a sewage station; the water after ultrafiltration treatment (namely clear liquid entering a primary source liquid tank) is treated by an electrodialysis membrane stack, thereby realizing the technical effects of the disclosure: on one hand, the effect of the ammonium nitrate electrodialysis water treatment is improved; on the other hand, the expenditure is reduced. According to the method disclosed by the disclosure, all indexes of the corresponding device are better than the original design expectation after the corresponding device operates for one year, the maintenance cost is reduced, and the cost is saved. In summary, the above embodiments fully illustrate:
1. the newly-added manganese sand and ultrafiltration device can well treat iron ions, rust, high molecular organic matters and other impurities in the ammonium nitrate electrodialysis water, reduce the turbidity of the wastewater entering an electrodialysis membrane stack to be below 0.2NTU, has a pollution index (SDI) <10, avoids pollutants from depositing on the surface of the membrane stack and blocking an ion exchange channel of the membrane stack, improves the effect of electrodialysis water treatment better than that of the original device, prolongs the service life and reduces the maintenance cost;
2. the newly-added manganese sand and ultrafiltration device has no discharge in the whole process of treating concentrated water and backwash water generated in the process of ammonium nitrate wastewater, and all the concentrated water and the backwash water are digested in the ammonium nitrate device, so that the treatment load is not newly added to a sewage station.
In addition, referring to fig. 2, the present disclosure also provides an apparatus for improving the effect of water treatment for ammonium nitrate electrodialysis, comprising:
the device comprises a first-stage lift pump unit, a first-stage filtering unit, a first storage tank, a second-stage lift pump unit and a second-stage filtering unit;
the first-stage lift pump unit is used for conveying the surface cooling liquid to the first-stage filtering unit through the lift pump unit;
the first-stage filtering unit is used for converting divalent and trivalent iron ions in the surface cooling liquid into ferric hydroxide precipitate to obtain treated surface cooling liquid, the first-stage filtering unit is further connected with an input port of a first storage tank to store the treated surface cooling liquid, and an output port of the first storage tank is further connected with a second-stage lift pump unit;
the second-stage lift pump unit is used for conveying the treated surface cooling liquid in the first storage tank to a cooler through the second-stage lift pump unit; the cooler is sequentially conveyed to the first precision filter, the second precision filter and the ceramic filter after being cooled;
the second-stage filtering unit is used for being connected with an output port of the ceramic filter so as to further filter the surface cooling liquid at a nanometer level and output clear liquid to the first-stage source liquid tank; and the clear liquid stored in the primary source liquid tank is further used for subsequent electrodialysis treatment.
For the above embodiment, the key is: firstly, the conversion and the precipitation of bivalent and trivalent iron ions in surface cooling liquid to ferric hydroxide are realized through the first-stage filtering unit, secondly, the nanoscale filtration is realized through the second-stage filtering unit, and thirdly, the first-stage lift pump unit and the second-stage lift pump unit are specially designed for facilitating the normal work of the first-stage filtering unit and the second-stage filtering unit. It should be noted that the first storage tank, the cooler, the first precision filter and the second precision filter belong to the prior art related device for electro-dialysis water treatment, and the present embodiment is skillfully characterized in that new units are inserted into different positions of the prior related device, so that the prior related device can be fully utilized, namely: the scheme of this embodiment is a transformation scheme, and the transformation cost is controllable.
In another embodiment of the present invention, the substrate is,
the first-stage lift pump unit comprises a first lift pump and a second lift pump and is used for conveying the surface cooling liquid to the first-stage filtering unit through the first lift pump and the second lift pump.
It is to be understood that this embodiment is one specific implementation of a first stage lift pump unit. On the premise of meeting the transformation target, if only one lifting pump is adopted to effectively convey the surface cooling liquid to the first-stage filtering unit, then one lifting pump can also be adopted. Generally, it is preferred to use two lift pumps.
In another embodiment of the present invention, the substrate is,
the first-stage filtering unit comprises a manganese sand filter, and is used for converting divalent and trivalent iron ions in the surface cooling liquid into ferric hydroxide precipitate to obtain the surface cooling liquid treated by the manganese sand filter, and the manganese sand filter is further connected with an input port of the first storage tank.
For this example, the conversion and precipitation of the corresponding iron ions was achieved by means of a manganese sand filter.
In another embodiment of the present invention, the substrate is,
the second-stage lift pump unit comprises a third lift pump and a fourth lift pump and is used for conveying the treated surface cooling liquid in the first storage tank to a cooler through the third lift pump and the fourth lift pump.
Similar to the first stage lift pump unit described above, it is preferred that the second stage lift pump unit also employs two lift pumps. If possible, a lift pump may also be used.
In another embodiment of the present invention, the substrate is,
the second-stage filtering unit comprises a security filter and an UF filter which are connected in sequence, wherein an output port of the ceramic filter is connected with an input port of the security filter.
It can be understood that the use of a security filter and an UF filter (note: the UF filter is simply referred to as UF ultrafiltration apparatus, or further simply referred to as ultrafiltration) connected in series is one embodiment of achieving nano-scale filtration.
In another embodiment of the present invention, the substrate is,
and the second-stage filtering unit also outputs concentrated solution for recycling ammonium nitrate to a second storage tank, and an output port of the second storage tank is further connected with the ammonium nitrate storage tank.
For this example, it further shows that: compared with the prior art, the method has better recycling capability, and the economic and environmental benefits of the method are further improved.
In another embodiment of the present invention, the substrate is,
the first-stage lift pump unit is connected with surface cooling liquid through a washing condensate pump and a neutralization tank in sequence.
It should be noted that the washing condensate pump and the neutralization tank belong to the related devices of the existing electroosmosis water treatment, which further highlights that the related devices of the existing electroosmosis water treatment can be fully utilized by the present disclosure.
In another embodiment of the present invention, the substrate is,
the apparatus alternates use of the first lift pump and the second lift pump.
More preferably, it is a mixture of more preferably,
the apparatus alternates use of the third lift pump and the fourth lift pump.
More preferably, it is a mixture of more preferably,
the neutralization tank comprises a first neutralization tank and a second neutralization tank which are alternately used.
For the different embodiments described above, which involve alternating use of the associated lift pump and neutralization tank, this is all to increase the efficiency of use of the lift pump or neutralization tank. In addition, the alternate use can also play a redundant backup role: in the extreme case, when one of the lift pumps or neutralization tanks fails, the other can be temporarily used for water treatment.
The above is merely a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, which may be variously modified and varied by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. A method for improving the treatment effect of ammonium nitrate electrodialysis water comprises the following steps:
s100: conveying the surface cooling liquid to a first-stage filtering unit through a first-stage lift pump unit;
s200: converting divalent and trivalent iron ions in the surface cooling liquid into ferric hydroxide precipitate through a first-stage filtering unit to obtain treated surface cooling liquid, wherein the first-stage filtering unit is further connected with an input port of a first storage tank to store the treated surface cooling liquid, and an output port of the first storage tank is further connected with a second-stage lift pump unit;
s300: conveying the treated surface cooling liquid in the first storage tank to a cooler through a second-stage lifting pump unit; the cooler is sequentially conveyed to the first precision filter, the second precision filter and the ceramic filter after being cooled;
s400: the second-stage filtering unit is connected with an output port of the ceramic filter, so that the surface cooling liquid is further filtered in a nanometer level, and meanwhile, clear liquid is output to the first-stage source liquid tank; and the clear liquid stored in the primary source liquid tank is further used for subsequent electrodialysis treatment.
2. The method of claim 1, wherein:
the first-stage lift pump unit comprises a first lift pump and a second lift pump and is used for conveying the surface cooling liquid to the first-stage filtering unit through the first lift pump and the second lift pump.
3. The method of claim 1, wherein:
the first-stage filtering unit comprises a manganese sand filter, and is used for converting divalent and trivalent iron ions in the surface cooling liquid into ferric hydroxide precipitate to obtain the surface cooling liquid treated by the manganese sand filter, and the manganese sand filter is further connected with an input port of the first storage tank.
4. The method of claim 1, wherein:
the second-stage lift pump unit comprises a third lift pump and a fourth lift pump and is used for conveying the treated surface cooling liquid in the first storage tank to a cooler through the third lift pump and the fourth lift pump.
5. The method of claim 1, wherein:
the second-stage filtering unit comprises a security filter and an UF filter which are connected in sequence, wherein an output port of the ceramic filter is connected with an input port of the security filter.
6. The method of claim 1, wherein:
and the second-stage filtering unit also outputs concentrated solution for recycling ammonium nitrate to a second storage tank, and an output port of the second storage tank is further connected with the ammonium nitrate storage tank.
7. The method of claim 1, wherein:
the first-stage lift pump unit is connected with the surface cooling liquid through a washing condensate pump and a neutralization tank in sequence.
8. The method of claim 2, wherein:
the first lift pump and the second lift pump are used alternately.
9. The method of claim 4, wherein:
the third lift pump and the fourth lift pump are used alternately.
10. An apparatus for improving the effect of water treatment by ammonium nitrate electrodialysis, comprising:
the device comprises a first-stage lift pump unit, a first-stage filtering unit, a first storage tank, a second-stage lift pump unit and a second-stage filtering unit;
the first-stage lift pump unit is used for conveying the surface cooling liquid to the first-stage filtering unit through the lift pump unit;
the first-stage filtering unit is used for converting divalent and trivalent iron ions in the surface cooling liquid into ferric hydroxide precipitate to obtain treated surface cooling liquid, the first-stage filtering unit is further connected with an input port of a first storage tank to store the treated surface cooling liquid, and an output port of the first storage tank is further connected with a second-stage lift pump unit;
the second-stage lift pump unit is used for conveying the treated surface cooling liquid in the first storage tank to a cooler through the second-stage lift pump unit; the cooler is sequentially conveyed to the first precision filter, the second precision filter and the ceramic filter after being cooled;
the second-stage filtering unit is used for being connected with an output port of the ceramic filter so as to further filter the surface cooling liquid at a nanometer level and output clear liquid to the first-stage source liquid tank; and the clear liquid stored in the primary source liquid tank is further used for subsequent electrodialysis treatment.
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