CN114956380A - Ternary wastewater pretreatment method and system - Google Patents
Ternary wastewater pretreatment method and system Download PDFInfo
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- CN114956380A CN114956380A CN202210613753.4A CN202210613753A CN114956380A CN 114956380 A CN114956380 A CN 114956380A CN 202210613753 A CN202210613753 A CN 202210613753A CN 114956380 A CN114956380 A CN 114956380A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 118
- 238000002203 pretreatment Methods 0.000 title claims abstract description 35
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 145
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 101
- 239000012528 membrane Substances 0.000 claims abstract description 61
- 238000004519 manufacturing process Methods 0.000 claims abstract description 59
- 238000000034 method Methods 0.000 claims abstract description 50
- 238000003825 pressing Methods 0.000 claims abstract description 37
- 230000008569 process Effects 0.000 claims abstract description 37
- 239000003513 alkali Substances 0.000 claims abstract description 19
- 238000007599 discharging Methods 0.000 claims abstract description 15
- 239000000706 filtrate Substances 0.000 claims abstract description 13
- 239000007787 solid Substances 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 239000002893 slag Substances 0.000 claims abstract description 10
- 239000002244 precipitate Substances 0.000 claims abstract description 7
- 238000004140 cleaning Methods 0.000 claims description 47
- 239000000243 solution Substances 0.000 claims description 32
- 238000005406 washing Methods 0.000 claims description 31
- 239000002253 acid Substances 0.000 claims description 28
- 239000002585 base Substances 0.000 claims description 15
- 238000001556 precipitation Methods 0.000 claims description 12
- 239000006228 supernatant Substances 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 11
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- 239000013049 sediment Substances 0.000 claims description 9
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- 239000000047 product Substances 0.000 claims description 7
- 238000009295 crossflow filtration Methods 0.000 claims description 4
- 239000010842 industrial wastewater Substances 0.000 claims description 2
- 230000001376 precipitating effect Effects 0.000 claims description 2
- 239000012141 concentrate Substances 0.000 claims 1
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- 229910001385 heavy metal Inorganic materials 0.000 abstract description 8
- 239000003814 drug Substances 0.000 abstract description 5
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 7
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- 239000010941 cobalt Substances 0.000 description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
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- 239000011572 manganese Substances 0.000 description 2
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- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
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- 229940044175 cobalt sulfate Drugs 0.000 description 1
- 229910000361 cobalt sulfate Inorganic materials 0.000 description 1
- KTVIXTQDYHMGHF-UHFFFAOYSA-L cobalt(2+) sulfate Chemical compound [Co+2].[O-]S([O-])(=O)=O KTVIXTQDYHMGHF-UHFFFAOYSA-L 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
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- 150000002500 ions Chemical class 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
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- 239000011702 manganese sulphate Substances 0.000 description 1
- SQQMAOCOWKFBNP-UHFFFAOYSA-L manganese(II) sulfate Chemical compound [Mn+2].[O-]S([O-])(=O)=O SQQMAOCOWKFBNP-UHFFFAOYSA-L 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 description 1
- 229940053662 nickel sulfate Drugs 0.000 description 1
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 description 1
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- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/02—Forward flushing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/04—Backflushing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/16—Use of chemical agents
- B01D2321/162—Use of acids
-
- 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
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- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to the technical field of wastewater treatment, and provides a ternary wastewater pretreatment method and a ternary wastewater pretreatment system, wherein the ternary wastewater pretreatment method comprises the following steps: carrying out ultrafiltration treatment on the production wastewater by using an alkali-resistant ultrafiltration membrane to obtain ultrafiltration production water and ultrafiltration concentrated water; discharging the ultrafiltration produced water into the next process section, and performing filter pressing treatment on the ultrafiltration concentrated water to obtain filter pressing solid slag and filter pressing filtrate; discharging the filter pressing solid slag, mixing the filter pressing filtrate into the to-be-treated production wastewater, and performing ultrafiltration treatment again. According to the ternary wastewater pretreatment method and system provided by the invention, the alkaline-resistant ultrafiltration membrane is directly used for carrying out ultrafiltration treatment on the production wastewater, impurities and alkaline heavy metal precipitates in the wastewater are effectively intercepted, and the water produced after membrane filtration (ultrafiltration water production) can directly enter a subsequent process section; the method saves equipment such as a high-density sedimentation tank and the like, reduces the dosage of the medicament, reduces the process steps compared with the traditional process, reduces the occupied area of treatment facilities, is favorable for improving the automation degree of the system and reduces operators.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a ternary wastewater pretreatment method and a ternary wastewater pretreatment system.
Background
In recent years, with the great heat of the new energy market, the demand for the ternary lithium battery is more vigorous. The production of the ternary precursor is to react a certain proportion of nickel sulfate, cobalt sulfate and manganese sulfate solution (the existing precursors of nickel, cobalt, aluminum, nickel, cobalt and the like) with liquid alkali under the ammonium condition to synthesize a compound taking hydroxide as a main body, and the solid obtained after the solid-liquid separation of the synthesized slurry is the ternary precursor material. The process for producing the ternary precursor material can generate a sulfate solution containing ammonium and sodium, wastewater generated in the production process and process washing water, the wastewater has the characteristics of high heavy metal content, high ammonia nitrogen concentration, high salt content, high alkalinity and the like, belongs to industrial wastewater difficult to treat, and simultaneously contains a small amount of heavy metal ions such as nickel, cobalt, manganese and the like, so that the ternary wastewater is necessary to be effectively recycled.
At present, the mainstream pretreatment method for lithium battery wastewater is a traditional treatment process, wherein the traditional treatment process refers to the steps of setting a weight removal link and carrying out pretreatment by a combined method of precipitation filtration, precise filtration and the like.
The heavy metal precipitation content in the ternary wastewater is low, and the particle size of the hydroxide precipitation of the heavy metal is very small and reaches the micron level. The traditional process is adopted to remove the heavy load, an adjusting tank, a high-density sedimentation tank, a precision filter and a plate-and-frame filter press need to be arranged, and because the production process of the filter cloth of the filter press determines that the pore of the filter cloth cannot be too small, the production wastewater with low content and tiny particles is difficult to effectively intercept, the running process of the traditional process is complex, a large amount of medicaments need to be added, and a plurality of operators need to be occupied.
Disclosure of Invention
The invention provides a ternary wastewater pretreatment method and a ternary wastewater pretreatment system, which are used for solving the problems that the ternary wastewater treatment process is complex, a large amount of medicament needs to be added and a plurality of operators are occupied in the prior art.
The invention provides a ternary wastewater pretreatment method, which comprises the following steps:
carrying out ultrafiltration treatment on the production wastewater by using an alkali-resistant ultrafiltration membrane to obtain ultrafiltration production water and ultrafiltration concentrated water;
discharging the ultrafiltration produced water into the next process section, and performing filter pressing treatment on the ultrafiltration concentrated water to obtain filter pressing solid slag and filter pressing filtrate;
and discharging the filter pressing solid slag, and mixing the filter pressing filtrate into the to-be-treated production wastewater for ultrafiltration treatment again.
According to the ternary wastewater pretreatment method provided by the invention, before the ultrafiltration treatment is carried out on the production wastewater by using the alkali-resistant ultrafiltration membrane to obtain ultrafiltration production water and ultrafiltration concentrated water, the method further comprises the following steps:
and adjusting the pH value of the production wastewater to enable the pH value of the production wastewater to be in a preset range.
According to the ternary wastewater pretreatment method provided by the invention, the pH value adjustment of the production wastewater comprises the following steps:
and adding an acid-base regulator into the production wastewater, and stirring the production wastewater.
The ternary wastewater pretreatment method provided by the invention further comprises the following steps:
the ultrafiltration membrane is acid washed so that the ultrafiltration membrane can be reused for ultrafiltration treatment.
According to the ternary wastewater pretreatment method provided by the invention, the cleaning acid solution for carrying out acid cleaning on the ultrafiltration membrane is a sulfuric acid cleaning solution.
The ternary wastewater pretreatment method provided by the invention further comprises the following steps:
carrying out precipitation treatment on the membrane washing water;
discharging the sediment, and mixing the sediment concentrated solution into the production wastewater to be treated for ultrafiltration treatment again.
According to the ternary wastewater pretreatment method provided by the invention, after the membrane washing water is subjected to precipitation treatment, the method further comprises the following steps:
the supernatant of the precipitate is used again by acid washing.
According to the ternary wastewater pretreatment method provided by the invention, the ultrafiltration produced water is discharged into the next process section, and the method comprises the following steps:
detecting the ultrafiltration water production;
mixing the ultrafiltration produced water which does not meet the preset conditions into the production wastewater to be treated or ultrafiltration concentrated water;
and discharging the ultrafiltration product water meeting the preset conditions into the next process section.
According to the ternary wastewater pretreatment method provided by the invention, the production wastewater is subjected to ultrafiltration by adopting a cross-flow filtration method.
The invention also provides a pretreatment system suitable for the ternary wastewater pretreatment method, which comprises the following steps:
a raw water supply unit;
the ultrafiltration unit is an alkali-resistant ultrafiltration membrane and is provided with a stock solution inlet, an ultrafiltrate outlet and a concentrated solution outlet, the stock solution inlet is communicated with the raw water supply unit, and the ultrafiltrate outlet is communicated with subsequent treatment equipment; and
and the inlet of the filter pressing equipment is communicated with the concentrated solution outlet, and the filtrate outlet of the filter pressing equipment is communicated with the raw water supply unit.
According to the ternary wastewater pretreatment method and system provided by the invention, the alkaline-resistant ultrafiltration membrane is directly used for carrying out ultrafiltration treatment on the production wastewater, impurities and alkaline heavy metal precipitates in the wastewater are effectively intercepted, and the water produced after membrane filtration (ultrafiltration water production) can directly enter a subsequent process section; the method saves equipment such as a high-density sedimentation tank and the like, reduces the dosage of the medicament, reduces the process steps compared with the traditional process, reduces the occupied area of treatment facilities, is favorable for improving the automation degree of the system and reduces operators.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of the overall structure of a ternary wastewater pretreatment system provided by the present invention;
FIG. 2 is a schematic diagram showing a liquid supply pipeline structure in a ternary wastewater pretreatment system provided by the present invention;
FIG. 3 is a schematic flow diagram of a ternary wastewater pretreatment process provided by the present invention;
reference numerals: 1. a raw water pool; 2. a regulating tank; 3. an ultrafiltration unit; 31. an ultrafiltration device; 4. a filter pressing device; 5. cleaning equipment; 6. washing the membrane water sedimentation tank; 7. adding equipment; a. a first feed liquid outlet branch; b. a second feed liquid outlet branch; c. a liquid supply inlet branch; d. a first liquid return inlet branch; e. a second return liquid inlet branch; f. a liquid return outlet branch; g. and (4) switching on and off the valve.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
The ternary wastewater pretreatment system according to the embodiment of the present invention is described below with reference to fig. 1 and 2, and includes a raw water supply unit adapted to supply ternary wastewater to a subsequent filtration apparatus, the ternary wastewater itself being alkaline and having a PH of about 13, an ultrafiltration unit 3, and a pressure filtration apparatus 4. The ultrafiltration unit 3 adopts an alkali-resistant ultrafiltration membrane and can directly filter the ternary wastewater.
The ultrafiltration unit 3 is provided with a stock solution inlet, an ultrafiltrate outlet and a concentrated solution outlet, the stock solution inlet is communicated with the raw water supply unit, the ternary wastewater supplied by the raw water supply unit enters the ultrafiltration unit 3 through the stock solution inlet, and is filtered through an alkali-resistant ultrafiltration membrane of the ultrafiltration unit 3, so that impurities and alkali heavy metal in the ternary wastewater can be effectively intercepted.
The ultrafiltrate outlet is communicated with subsequent treatment equipment, the ultrafiltration water produced from the ultrafiltrate outlet is the water produced after being filtered by the ultrafiltration membrane, all indexes of the ultrafiltration water reach the standard, and the ultrafiltration water can directly enter the next process section for further concentration and evaporation.
The filter pressing equipment 4 can adopt a plate-and-frame filter press, the inlet of the filter pressing equipment 4 is communicated with the concentrated solution outlet, the filtrate outlet of the filter pressing equipment 4 is communicated with the raw water supply unit, after the ultrafiltered concentrated water enters the filter pressing equipment 4, the filter pressing equipment 4 removes suspended matters in the solution to obtain filter pressing solid slag and filter pressing filtrate, the filter pressing solid slag is discharged outwards, and the filter pressing filtrate is discharged into the raw water supply unit to perform the pretreatment circulation process again.
Compared with the traditional impurity and weight removal process, the ternary wastewater pretreatment system provided by the embodiment of the invention has the advantages that the addition amount of a medicament can be reduced, the process steps are reduced, the occupied area of treatment facilities is reduced, the automation degree of the system is improved, the number of operators is reduced, and the ternary wastewater pretreatment system has good economic benefits and environmental protection benefits.
In some embodiments of the present invention, the raw water supply unit includes a raw water tank 1, a regulating tank 2, and an adding device 7, an inlet of the regulating tank 2 is communicated with an outlet of the raw water tank 1, and wastewater in the raw water tank 1 can flow into the regulating tank 2. The inlet of the adding device 7 is communicated with the regulating reservoir 2 so as to be suitable for adding an acid-base regulator into the regulating reservoir 2 to regulate the acid-base of the wastewater in the regulating reservoir 2. The adding device 7 can select a PH value adjusting automatic dosing device, after a proper PH value range is set, the adding device 7 can automatically add an acid-base regulator into the regulating tank 2, so that the wastewater in the regulating tank 2 is maintained in the PH value range. The outlet of the regulating reservoir 2 is communicated with the ultrafiltration unit 3, and the wastewater after acid-base regulation enters the ultrafiltration unit 3 for filtration.
Establish equalizing basin 2 through adding, can guarantee to let in the waste water pH value in ultrafiltration unit 3 at reasonable within range, not only can guarantee the filter effect, can also play the guard action to alkali-resistant milipore filter. It should be noted here that when the pH of the wastewater is within a reasonable range, the adjustment tank 2 may not be provided, or the adjustment of pH may be performed without using the adjustment tank 2.
In some embodiments of the present invention, the raw water supply unit further comprises a stirring device, the stirring device is a stirrer or a flow impeller, the stirring device is installed in the regulating reservoir, for example, when the stirring device is a stirrer, a stirring head of the stirring device is placed in the regulating reservoir 2. When the stirring equipment runs, the waste water can be stirred, so that the acid-base regulator is better mixed in the waste water, and the solution is uniform.
In some embodiments of the present invention, the ultrafiltration unit 3 includes an ultrafiltration device 31, the ultrafiltration device 31 may adopt an internal pressure type membrane module or an external pressure type membrane module, and the ultrafiltration membrane inside is an alkali-resistant ultrafiltration membrane, which can filter alkaline ternary wastewater. Further, the ultrafiltration device 31 adopts a cross-flow filtration mode, so that a pollution layer of the ultrafiltration membrane can be kept at a relatively thin level, and the filtering capability of the ultrafiltration membrane can be ensured.
In some embodiments of the present invention, the ternary wastewater pretreatment system further includes a cleaning device 5, a liquid supply pipeline and a liquid return pipeline, the cleaning device 5 is communicated with an inlet of the liquid supply pipeline, an outlet of the liquid supply pipeline is communicated with the ultrafiltration unit 3 to be suitable for supplying a cleaning liquid to the ultrafiltration unit 3 to clean the ultrafiltration unit 3, and the cleaning liquid supplied by the cleaning device 5 is preferably sulfuric acid, which can prevent impurities from being introduced. The inlet of the return line communicates with the ultrafiltration unit 3 and is adapted to lead away the washing liquid in the ultrafiltration unit 3.
Optionally, the ternary wastewater pretreatment system further comprises a membrane washing water sedimentation tank 6, an outlet of the liquid return pipeline is communicated with an inlet of the membrane washing water sedimentation tank 6, membrane washing water for cleaning the ultrafiltration unit 3 is introduced into the membrane washing water sedimentation tank 6 through the liquid return pipeline, membrane washing water is precipitated to form sediment, a precipitation concentrated solution and a precipitation supernatant, the sediment is discharged outside, a concentrated solution outlet of the membrane washing water sedimentation tank 6 is communicated with a raw water supply unit, and the precipitation concentrated solution can be refluxed to the raw water supply unit so as to be subjected to ultrafiltration treatment again.
Optionally, the liquid supply pipeline comprises a first liquid supply outlet branch a, a second liquid supply outlet branch b and a liquid supply inlet branch c which are communicated with each other; the liquid return pipeline comprises a first liquid return inlet branch d, a second liquid return inlet branch e and a liquid return outlet branch f which are communicated with each other; the first liquid supply outlet branch a and the second liquid return inlet branch e are communicated with a stock solution inlet of the ultrafiltration device 31, the second liquid supply outlet branch b and the first liquid return inlet branch d are communicated with a concentrated solution outlet of the ultrafiltration device 31, the liquid supply inlet branch c is communicated with the cleaning equipment 5, the liquid return outlet branch f is communicated with the membrane washing water sedimentation tank 6, and the first liquid supply outlet branch a, the second liquid supply outlet branch b, the first liquid return inlet branch d and the second liquid return inlet branch e are respectively provided with a switch valve g.
When the ultrafiltration membrane is cleaned, the cleaning operation can be carried out in two directions of forward direction and reverse direction. When the cleaning equipment 5 runs in the forward direction, the switch valves g on the second liquid supply outlet branch b and the second liquid return inlet branch e are closed, the switch valves g on the first liquid supply outlet branch a and the first liquid return inlet branch d are opened, the cleaning liquid is supplied to the stock solution inlet of the ultrafiltration device 31 through the first liquid supply outlet branch a, flows into the first liquid return inlet branch d through the concentrated solution outlet of the ultrafiltration device 31, and finally flows into the membrane washing water sedimentation tank 6; when the cleaning equipment 5 runs reversely, the switch valves g on the first liquid supply outlet branch a and the first liquid return inlet branch d are closed, the switch valves g on the second liquid supply outlet branch b and the second liquid return inlet branch e are opened, the cleaning liquid is supplied to the concentrated liquid outlet of the ultrafiltration device 31 through the second liquid supply outlet branch b, flows into the second liquid return inlet branch e through the stock solution inlet of the ultrafiltration device 31, and finally flows into the membrane washing water sedimentation tank 6. Therefore, the ultrafiltration membrane can be cleaned in two directions, and a better cleaning effect is achieved.
Optionally, the cleaning device 5 includes an acid storage tank and a first pressure pump, an inlet of the first pressure pump is communicated with an outlet of the acid storage tank, an outlet of the first pressure pump is communicated with an inlet of the liquid supply pipeline, and the first pressure pump is operable to pump the acid in the acid storage tank into the liquid supply pipeline for cleaning the ultrafiltration membrane.
Optionally, the ternary wastewater pretreatment system further comprises a cleaning controller, and the first pressure pump and the switch valves g on the first liquid supply outlet branch a, the second liquid supply outlet branch b, the first liquid return inlet branch d and the second liquid return inlet branch e are simultaneously connected with the cleaning controller, so that the comprehensive control of the first pressure pump and each switch valve g is realized.
In some embodiments of the present invention, the ternary wastewater pretreatment system further includes a circulation device, an inlet of the circulation device is communicated with the supernatant outlet of the membrane washing water sedimentation tank 6, and an outlet of the circulation device is communicated with the cleaning device 5, so that the reuse of the acid liquor can be realized, and the amount of the cleaning acid liquor can be reduced.
Optionally, the circulating device comprises a second pressure pump and a filter, an inlet of the second pressure pump is communicated with the supernatant outlet of the membrane washing water sedimentation tank 6, an outlet of the second pressure pump is communicated with an inlet of the filter, an outlet of the filter is communicated with the cleaning device 5, the supernatant in the membrane washing water sedimentation tank 6 is pumped out by the second pressure pump, filtered by the filter and then supplied to the cleaning device 5 for reuse, and therefore impurities can be prevented from blocking the cleaning device 5.
Optionally, the outlet of the filter is connected to the inlet of the first pressure pump, and the recycled acid liquid is not fed into the acid liquid storage tank, but is directly fed into the liquid supply pipeline through the first pressure pump, so as to prevent the unused acid liquid in the acid liquid storage tank from being polluted.
Optionally, the outlet pipeline of the acid liquor storage tank and the outlet pipeline of the filter are respectively provided with a one-way valve, so that acid liquor backflow can be prevented.
The ternary wastewater pretreatment method provided by the invention is described below with reference to fig. 3, and the ternary wastewater pretreatment described below and the ternary wastewater pretreatment system described above can be referred to correspondingly.
The ternary wastewater pretreatment method provided by the embodiment of the invention comprises the following steps:
s1, carrying out ultrafiltration treatment on the production wastewater by using an alkali-resistant ultrafiltration membrane to obtain ultrafiltration production water and ultrafiltration concentrated water. The production wastewater in the raw water supply unit is supplied to the ultrafiltration unit 3, and the production wastewater is subjected to ultrafiltration treatment by the alkali-resistant ultrafiltration membrane in the ultrafiltration unit 3, wherein the ultrafiltration treatment process preferably adopts a cross-flow filtration mode, and ultrafiltration product water and ultrafiltration concentrated water are obtained through the filtration effect of the ultrafiltration unit 3.
S2, discharging the ultrafiltration produced water into the next process section, and carrying out filter pressing treatment on the ultrafiltration concentrated water to obtain filter pressing solid slag and filter pressing filtrate. Verified, the ultrafiltration produced water obtained by the alkali-resistant ultrafiltration membrane has the following component parameters: ss is less than or equal to 8mg/L, Ni is less than or equal to 0.1mg/L, Co is less than or equal to 0.1mg/L, Mn is less than or equal to 0.1mg/L, turbidity is less than or equal to 1NTU, and the waste water can be directly discharged into the next process section. The ultrafiltration concentrated water can be subjected to filter pressing treatment by a filter pressing device 4 to remove suspended matters in the ultrafiltration concentrated water.
S3, discharging the filter-pressing solid slag, mixing the filter-pressing filtrate into the to-be-treated production wastewater, and performing ultrafiltration treatment again.
According to the ternary wastewater pretreatment method provided by the embodiment of the invention, before the step S1 of performing ultrafiltration treatment on the production wastewater by using the alkali-resistant ultrafiltration membrane to obtain ultrafiltration production water and ultrafiltration concentrated water, the method further comprises the following steps:
s1', adjusting the pH value of the production wastewater to make the pH value of the production wastewater within a preset range. The raw water supply unit is provided with an adjusting tank 2, and after water in the raw water tank 1 enters the adjusting tank 2, an acid-base regulator is added into the adjusting tank 2, so that the pH value in the adjusting tank 2 is controlled within a preset range. The predetermined range may be determined according to the applicable ph of the alkali-resistant ultrafiltration membrane in the ultrafiltration unit 3. It can be understood that when treating partial kinds of wastewater, the PH of the wastewater itself meets the filtration requirement, i.e. the PH of the wastewater is within a preset range, and PH adjustment may not be performed.
Optionally, the adjusting the ph of the production wastewater in step S1' includes: adding an acid-base regulator into the production wastewater, and stirring the production wastewater. The process of adding the acid-base regulator can be realized by the adding equipment 7, and after the acid-base regulator is added, the production wastewater is stirred by the stirring equipment, so that the acid-base regulator can be better mixed in the production wastewater, and the solution is uniform.
Optionally, the process of adding the pH adjusting agent is automatically performed by the adding device 7. Specifically, add equipment 7 and can choose for use PH pH valve regulation automatic reagent feeding equipment, its PH value that can measure in the equalizing basin 2 and carry out automatically regulated according to the measured value, after setting for suitable PH value scope, add equipment 7 and can add acid-base regulator in to equalizing basin 2 voluntarily, make the waste water in the equalizing basin 2 maintain in this PH value scope.
In some embodiments of the invention, the draining of the ultrafiltration product water to the next process stage in step S2 comprises:
and S2', detecting the ultrafiltration water production. The detected content may include suspended matter and heavy metal content, turbidity, etc.
S2', mixing the ultrafiltration produced water which does not meet the preset conditions into the production wastewater to be treated or the ultrafiltration concentrated water. The step of not meeting the preset condition means that part or all of the detection results of the ultrafiltration water production exceed the preset value vertically, and the ultrafiltration water production which does not meet the preset condition is mixed into the production wastewater to be treated or ultrafiltration concentrated water, so that ultrafiltration treatment or filter pressing treatment can be repeatedly carried out.
S2', and discharging the ultrafiltration product water meeting the preset conditions to the next process section.
It should be noted here that there is no precedence order between step S2 ″ and step S2 ″, and both steps can be performed simultaneously.
The ternary wastewater pretreatment method provided by the embodiment of the invention further comprises the following steps:
s4, acid washing the ultrafiltration membrane so that the ultrafiltration membrane can be repeatedly used for ultrafiltration treatment.
Optionally, the cleaning acid solution for acid cleaning of the ultrafiltration membrane is a sulfuric acid cleaning solution, which can prevent the introduction of impurities.
The acid washing process is realized by using a cleaning device 5, and the cleaning device 5 supplies acid liquor to the ultrafiltration unit 3 to clean impurities on the alkali-resistant ultrafiltration membrane. Preferably, the cleaning device 5 is used for cleaning in both the forward direction and the reverse direction, so that a better cleaning effect can be achieved. In an alternative mode, forward cleaning and reverse cleaning are continuously and alternately carried out in each cleaning process; in another alternative, one cleaning process is selected from either the forward cleaning process or the reverse cleaning process, the other cleaning process is selected from the other cleaning process, and the above steps are repeated.
In some embodiments of the invention, the ternary wastewater pretreatment method further comprises:
and S5, precipitating the membrane washing water. After the ultrafiltration membrane is acid-washed, the membrane washing water contains impurities washed from the ultrafiltration membrane, and the membrane washing water is led into a membrane washing water sedimentation tank 6 to be subjected to sedimentation treatment, so that sediment, a sedimentation concentrated solution and a sedimentation supernatant can be formed.
S6, discharging the sediment, mixing the sediment concentrated solution into the to-be-treated production wastewater, and performing ultrafiltration treatment again. The precipitated concentrated solution enters the raw water supply unit and then is mixed with the production wastewater, and the precipitated concentrated solution is acidic, so that the acid-base regulation can be performed on the production wastewater in the process, and the reduction of the use amount of the acid-base regulator is facilitated.
According to the ternary wastewater pretreatment method provided by the embodiment of the invention, after the step S5 is used for carrying out precipitation treatment on the membrane washing water, the method further comprises the following steps:
s7, putting the supernatant of the precipitate into acid washing again for use. And (3) supplying the supernatant of the precipitate into the cleaning equipment 5 by using a circulating device, wherein the supernatant of the precipitate is acidic and can be repeatedly used for carrying out ultrafiltration membrane acid cleaning.
Optionally, the precipitation supernatant is filtered before being put into acid washing again to prevent impurities in the precipitation supernatant from clogging the washing apparatus 5.
It should be noted that there is no precedence order between step S6 and step S7, and both steps may be performed simultaneously.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A ternary wastewater pretreatment method is characterized by comprising the following steps:
carrying out ultrafiltration treatment on the production wastewater by using an alkali-resistant ultrafiltration membrane to obtain ultrafiltration production water and ultrafiltration concentrated water;
discharging the ultrafiltration produced water into the next process section, and performing filter pressing treatment on the ultrafiltration concentrated water to obtain filter pressing solid slag and filter pressing filtrate;
and discharging the filter-pressing solid slag, and mixing the filter-pressing filtrate into the to-be-treated production wastewater for ultrafiltration treatment again.
2. The ternary wastewater pretreatment method of claim 1, further comprising, before the ultrafiltration treatment of the production wastewater with the alkali-resistant ultrafiltration membrane to obtain the ultrafiltration product water and the ultrafiltration concentrate water:
and adjusting the pH value of the production wastewater to enable the pH value of the production wastewater to be in a preset range.
3. The ternary wastewater pretreatment method according to claim 2, wherein the adjusting of the pH value of the production wastewater comprises:
and adding an acid-base regulator into the production wastewater, and stirring the production wastewater.
4. The ternary wastewater pretreatment method of claim 1, further comprising:
the ultrafiltration membrane is acid washed so that the ultrafiltration membrane can be reused for ultrafiltration treatment.
5. The ternary wastewater pretreatment method of claim 4, wherein the cleaning acid solution used for acid cleaning of the ultrafiltration membrane is a sulfuric acid cleaning solution.
6. The ternary wastewater pretreatment method according to claim 4 or 5, further comprising:
carrying out precipitation treatment on the membrane washing water;
discharging the sediment, and mixing the sediment concentrated solution into the production wastewater to be treated for ultrafiltration treatment again.
7. The ternary wastewater pretreatment method according to claim 6, further comprising, after the precipitating the membrane washing water:
the supernatant of the precipitate is used again by acid washing.
8. The ternary wastewater pretreatment method of claim 1, wherein said discharging the ultrafiltration product water to the next process stage comprises:
detecting the ultrafiltration water production;
mixing the ultrafiltration produced water which does not meet the preset conditions into the production wastewater to be treated or ultrafiltration concentrated water;
and discharging the ultrafiltration product water meeting the preset conditions into the next process section.
9. The ternary wastewater pretreatment method of claim 1, wherein the ultrafiltration treatment of the industrial wastewater employs a cross-flow filtration method.
10. A pretreatment system suitable for the ternary wastewater pretreatment method according to any one of claims 1 to 9, comprising:
a raw water supply unit;
the ultrafiltration unit is an alkali-resistant ultrafiltration membrane and is provided with a stock solution inlet, an ultrafiltrate outlet and a concentrated solution outlet, the stock solution inlet is communicated with the raw water supply unit, and the ultrafiltrate outlet is communicated with subsequent treatment equipment; and
and the inlet of the filter pressing device is communicated with the concentrated solution outlet, and the filtrate outlet of the filter pressing device is communicated with the raw water supply unit.
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