CN117819760A - Foil washing wastewater treatment method - Google Patents
Foil washing wastewater treatment method Download PDFInfo
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- 238000005406 washing Methods 0.000 title claims abstract description 93
- 239000011888 foil Substances 0.000 title claims abstract description 80
- 238000004065 wastewater treatment Methods 0.000 title abstract description 6
- 239000002351 wastewater Substances 0.000 claims abstract description 92
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 64
- 238000000034 method Methods 0.000 claims abstract description 44
- 238000001914 filtration Methods 0.000 claims abstract description 30
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims abstract description 19
- 230000000844 anti-bacterial effect Effects 0.000 claims abstract description 19
- 239000003899 bactericide agent Substances 0.000 claims abstract description 19
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims abstract description 19
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 19
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 18
- 239000011574 phosphorus Substances 0.000 claims abstract description 18
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052796 boron Inorganic materials 0.000 claims abstract description 16
- 238000011033 desalting Methods 0.000 claims abstract description 13
- 238000005189 flocculation Methods 0.000 claims abstract description 7
- 230000016615 flocculation Effects 0.000 claims abstract description 7
- 230000001105 regulatory effect Effects 0.000 claims abstract description 6
- 238000005496 tempering Methods 0.000 claims abstract description 6
- 230000000368 destabilizing effect Effects 0.000 claims abstract description 5
- 230000003311 flocculating effect Effects 0.000 claims abstract description 3
- 230000001376 precipitating effect Effects 0.000 claims abstract 2
- 238000001223 reverse osmosis Methods 0.000 claims description 28
- 238000004062 sedimentation Methods 0.000 claims description 19
- 238000000108 ultra-filtration Methods 0.000 claims description 15
- 239000012528 membrane Substances 0.000 claims description 13
- 238000011084 recovery Methods 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 238000001471 micro-filtration Methods 0.000 claims description 6
- 230000001590 oxidative effect Effects 0.000 claims description 6
- 239000002455 scale inhibitor Substances 0.000 claims description 6
- 239000003638 chemical reducing agent Substances 0.000 claims description 5
- 230000004907 flux Effects 0.000 claims description 5
- 239000006004 Quartz sand Substances 0.000 claims description 4
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims description 4
- 239000003830 anthracite Substances 0.000 claims description 4
- 230000014759 maintenance of location Effects 0.000 claims description 3
- 238000011282 treatment Methods 0.000 abstract description 22
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000004064 recycling Methods 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 15
- 239000000126 substance Substances 0.000 description 14
- 239000007787 solid Substances 0.000 description 9
- 244000005700 microbiome Species 0.000 description 6
- 238000010612 desalination reaction Methods 0.000 description 5
- 239000012535 impurity Substances 0.000 description 5
- 239000000084 colloidal system Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000001728 nano-filtration Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 229940037003 alum Drugs 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 2
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 2
- 239000004327 boric acid Substances 0.000 description 2
- 238000009395 breeding Methods 0.000 description 2
- 230000001488 breeding effect Effects 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 239000012776 electronic material Substances 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000008235 industrial water Substances 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- JPMIIZHYYWMHDT-UHFFFAOYSA-N octhilinone Chemical compound CCCCCCCCN1SC=CC1=O JPMIIZHYYWMHDT-UHFFFAOYSA-N 0.000 description 2
- 239000013618 particulate matter Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- DUCCKQSNXPFEGT-UHFFFAOYSA-N 4-hydroxy-5-[(2-hydroxyphenyl)methylideneamino]naphthalene-2,7-disulfonic acid Chemical compound Oc1ccccc1C=Nc1cc(cc2cc(cc(O)c12)S(O)(=O)=O)S(O)(=O)=O DUCCKQSNXPFEGT-UHFFFAOYSA-N 0.000 description 1
- 241000251468 Actinopterygii Species 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 210000005056 cell body Anatomy 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000001687 destabilization Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000011221 initial treatment Methods 0.000 description 1
- MGIYRDNGCNKGJU-UHFFFAOYSA-N isothiazolinone Chemical group O=C1C=CSN1 MGIYRDNGCNKGJU-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
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- 238000005375 photometry Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The application relates to the technical field of wastewater treatment, and particularly discloses a treatment method of foil washing wastewater. The treatment method of the foil washing wastewater provided by the application comprises the following steps: tempering and destabilizing, flocculating, precipitating, filtering and desalting; wherein, the tempering and destabilizing steps are as follows: firstly, regulating the pH value of foil washing wastewater to 7-8; the flocculation step is as follows: adding a bactericide, polyaluminium ferric chloride and polyacrylamide into the quenched and destabilized foil washing wastewater; the pH of raw water of the foil washing wastewater is 3-4, the phosphorus content is 30-60mg/L, the boron content is 1-2mg/L, and the suspended matter concentration is 300-1000mg/L. The treatment method of the foil washing wastewater can reduce the phosphorus content, the boron content and the suspended matter concentration of the foil washing wastewater; and the regenerated desalted water with different conductivities can be obtained, so that different water demands can be met, the recycling of wastewater resources is achieved, and the method has good economic benefit.
Description
Technical Field
The application relates to the technical field of wastewater treatment, in particular to a method for treating foil washing wastewater.
Background
A large amount of foil washing waste water is generated in the electrode foil forming section, and the foil washing waste water is characterized in that: the salt content, organic matters and other impurities are low, and the phosphorus concentration, the boron concentration and the solid suspended matters are seriously out of limits, so that the ecological environment is seriously influenced. The existing foil washing wastewater treatment methods comprise a biological treatment method, an ion exchange method and a precipitation method. The biological treatment method has more occupied area, large investment and more application limit; the ion exchange method has the advantages that the equipment is expensive, the maintenance is very inconvenient, and the treatment is extremely difficult when the phosphorus concentration and the boron concentration in the wastewater are high; the precipitation method has simple facilities and easy operation, but has general treatment effect.
In addition, most of the current electronic production plants are also faced with the problems of shortage of water resources, high industrial water price, high pollution discharge cost and the like. Therefore, it is necessary to provide a method for treating foil-washing wastewater, which is simple to operate, small in occupied area and excellent in treatment effect, so as to treat and recycle the foil-washing wastewater.
Disclosure of Invention
In order to reduce the phosphorus content, the boron content and the suspended matter content in the foil washing wastewater, the application provides a treatment method of the foil washing wastewater.
The foil washing wastewater treatment method provided by the application adopts the following technical scheme:
a method for treating foil washing wastewater comprises the following steps: quenching and tempering, destabilization, flocculating settling, filtering and desalting;
tempering and destabilizing: firstly, regulating the pH value of foil washing wastewater to 7-8;
flocculation: then adding a bactericide, polyaluminium ferric chloride and polyacrylamide into the quenched and destabilized foil washing wastewater;
the pH of raw water of the foil washing wastewater is 3-4, the phosphorus content is 30-60mg/L, the boron content is 1-2mg/L, and the suspended matter concentration is 300-1000mg/L.
In the first-stage treatment of the foil washing wastewater, phosphorus-containing substances, boron-containing substances, microorganisms and the like in the foil washing wastewater are separated out and form solid floccule alum flocs by adjusting the pH value and then adding a bactericide, polyaluminium ferric chloride and polyacrylamide, so that good conditions are created for subsequent solid-liquid separation. The pH is adjusted to destabilize the water quality of the foil washing wastewater, and substances such as phosphoric acid, boric acid and the like in the water react and are separated out to form white floccules; the bactericide can inhibit and kill microorganisms in the foil washing wastewater and a small amount of organic matters are primarily oxidized and decomposed; the addition of polyaluminum ferric chloride and polyacrylamide can react with the white floc to form larger solid floc alum.
In this application, suspended matter refers to solid matter suspended in water, including suspended particulate matter, colloidal matter, and soluble organics.
Optionally, the addition of the bactericide is 0.05 to 0.15 per mill of the weight of the foil washing wastewater, the addition of the polyaluminum ferric chloride is 0.03 to 0.21 per mill of the weight of the foil washing wastewater, and the addition of the polyacrylamide is 0.0005 to 0.002 per mill of the weight of the foil washing wastewater.
In some embodiments, the polyaluminum ferric chloride may be added in an amount of 0.08 to 0.1%, 0.08 to 0.15%, 0.08 to 0.21%, 0.1 to 0.15%, 0.1 to 0.21%, or 0.15 to 0.21% by weight of the foil wash wastewater.
In a specific embodiment, the addition amount of the polyaluminum ferric chloride can be 0.08 per mill, 0.1 per mill, 0.15 per mill or 0.21 per mill of the weight of the foil washing wastewater.
In some embodiments, the polyacrylamide may be added in an amount of 0.0005-0.001%, 0.0005-0.0015%, 0.0005-0.0002%, 0.001-0.0015%, 0.001-0.002%, or 0.0015-0.002% by weight of the foil-washing wastewater.
In a specific embodiment, the polyacrylamide may be added in an amount of 0.0005%, 0.001%, 0.0015%, or 0.002% by weight of the foil-washing wastewater.
In the application, the component of the bactericide is isothiazolinone with the CAS number of 26172-55-4.
In the application, the flocculation step specifically comprises: and adding a bactericide, polyaluminium ferric chloride and polyacrylamide into the quenched and destabilized foil washing wastewater, and rapidly and uniformly mixing under the action of a stirrer.
In the flocculation step, foil washing wastewater, polyaluminium ferric chloride, polyacrylamide and the like can be uniformly mixed and quickly coagulated through quick stirring, alum flowers with larger volume and density are generated, the quality of the generated floccules is further ensured, and conditions are created for subsequent precipitation.
Optionally, the sedimentation adopts inclined plate sedimentation, and the hydraulic retention time SRT of the inclined plate sedimentation is 60-90min.
In the application, the specific steps of inclined plate sedimentation are as follows: and (5) delivering the flocculated water to an inclined plate sedimentation area, and staying for 60min.
This application design adopts the pipe chute to deposit and carries out mud-water separation, because precipitation effect is efficient, the suspended solid concentration of leaving sedimentation tank mud layer is very low, and the pipe chute has also increased sedimentation area, utilizes shallow pond sedimentation principle, and the pipe chute helps changing the rivers direction and then changes the interrelationship of floc sinking rate and water velocity, reduces the route that aquatic suspended particles subsided, improves the suspended solid removal rate, has also improved hydraulic load, has less cell body and higher water velocity. Compared with the common flat plate sedimentation in the related art, the inclined plate sedimentation has the advantages that the hydraulic retention time SRT is greatly shortened, the occupied area is smaller, and the mud-water separation effect is better.
Optionally, the filtering comprises coarse filtering and fine filtering; the coarse filtration adopts a multi-medium filter, and the multi-medium filter is filled with quartz sand and anthracite in a weight ratio of 2:1.
In this application, can get rid of impurity such as silt, suspended solid, colloid in the aquatic through coarse filtration, carry out preliminary purification to producing water, reduce the turbidity of intaking, reach follow-up fine filtration's requirement of intaking.
Optionally, the fine filtration comprises microfiltration, ultrafiltration, primary security filtration, primary reverse osmosis, secondary security filtration, and secondary reverse osmosis.
Optionally, the microfiltration employs a self-cleaning filter; the security filter adopts a security filter, and a PP melt-blown filter element with the aperture of 1-5 mu m is arranged in the security filter.
In this application, from wasing the filter and can produce water with the multi-media filter, hold back the big granule suspended solid in the aquatic, the safe operation of protection follow-up ultrafiltration device avoids the milipore filter component to be blocked by big particulate matter or by the fish tail damage to improve the life of milipore filter. The ultrafiltration can remove suspended matters, colloid, microorganisms and macromolecular organic matters in water, so that the quality of the effluent reaches the water inlet requirement of primary reverse osmosis, and the recovery rate and the membrane flux of the ultrafiltration are controlled within the above range, so that the membrane assembly can be prevented from bearing higher operation load, and has good anti-pollution capability and backwash and cleaning recovery capability. The security filtration can effectively intercept the leaked fine mechanical impurities and broken active carbon particles in the pretreatment equipment, ensure that the particles do not enter the reverse osmosis water treatment system, and prevent the reverse osmosis membrane from being blocked by the possible residual impurities. Reverse osmosis can remove dissolved salts, organic molecules, silica colloid, macromolecular substances, particles which are not removed by pretreatment, and the like in water.
Optionally, in the ultrafiltration step, the recovery rate is set to be 80-95%, the membrane flux is 30-70LMH, and the effluent quality reaches turbidity less than or equal to 0.2NTU and SDI less than or equal to 3.
Optionally, a scale inhibitor, a reducing agent and a non-oxidizing bactericide are added into the primary reverse osmosis water before the primary security filtration; before the secondary security filtration, a PH regulator is added into the secondary reverse osmosis inflow water.
In this application, the reducing agent acts to reduce residual chlorine present in the pre-treatment process. Because the reverse osmosis and nanofiltration composite membrane is very sensitive to residual chlorine, the total accumulated bearing capacity is only 1000mg/lh; therefore, an excessive amount of reducing agent must be added to prevent oxidation of the membrane desalination layer by the oxidizing agent, resulting in reverse osmosis and a decrease in nanofiltration membrane desalination rate. The function of the scale inhibitor is to add the high-efficiency RO special scale inhibitor before the pretreated raw water enters the nanofiltration and reverse osmosis system so as to inhibit scaling on the nanofiltration and reverse osmosis concentrated water side. The non-oxidizing bactericide is used for preventing microorganisms and bacteria from breeding and polluting the reverse osmosis membrane, and the reverse osmosis water inlet is preferably added with the non-oxidizing bactericide periodically so as to ensure that the system is not bothered by microorganism breeding.
Optionally, the desalting adopts EDI desalting.
In the application, the step of EDI desalination is specifically: and (3) feeding the water produced by the second-stage reverse osmosis into EDI, and performing refined desalting through continuous electric desalting to obtain regenerated desalted water.
In summary, the present application has the following beneficial effects:
1. the application provides a treatment method of foil washing wastewater, which can effectively remove phosphorus-containing substances, boric acid, partial soluble organic substances, refractory organic substances, suspended substances, microorganisms, dissolved salts, colloid and the like in the foil washing wastewater, so that the phosphorus content in the foil washing wastewater is reduced to below 5mg/L, the boron content is reduced to below 0.1mg/L, the concentration of suspended substances is reduced to below 20mg/L, and the wastewater discharge standard is completely met.
2. According to the method for treating the foil washing wastewater, the desalted water with the conductivity below 400us/cm can be obtained after the first-stage reverse osmosis, the regenerated desalted water with the conductivity below 0.5us/cm can be obtained after the EDI desalting, the desalted water with different conductivities can respectively meet the water quality requirements of the reuse water in different process sections, and the treatment, recycling and reutilization of the foil washing wastewater are realized.
Drawings
Fig. 1 is a flow chart of a method for treating foil washing wastewater provided by the application.
Detailed Description
The application provides a treatment method of foil washing wastewater, which comprises the following steps:
(1) Regulating to destabilize: firstly, naOH is added into the foil washing wastewater to adjust the pH value of the foil washing wastewater to 7-8.
(2) Flocculation: to the foil washing wastewater were added a bactericide (Kathon, available from Shandong gold beautification Co., ltd.), polyaluminum ferric chloride and polyacrylamide. Wherein, the addition of the bactericide is 0.05 to 0.15 per mill of the weight of the foil washing wastewater, the addition of the polyaluminum ferric chloride is 0.03 to 0.21 per mill of the weight of the foil washing wastewater, and the addition of the polyacrylamide is 0.0005 to 0.002 per mill of the weight of the foil washing wastewater.
In the application, the pH value of raw water of the foil washing wastewater is 3-4, the phosphorus content is 30-60mg/L, the boron content is 1-2mg/L, and the suspended matter concentration is 300-1000mg/L.
(3) Inclined plate sedimentation: and (5) delivering the flocculated water to an inclined plate sedimentation area, and staying for 60-90min.
(4) Coarse filtration: pumping the product water after the inclined plate sedimentation treatment into a multi-medium filter for preliminary coarse filtration; wherein, the multi-medium filter is filled with quartz sand and anthracite with the mass ratio of 2:1.
(5) Fine filtration: the produced water of the multi-medium filter enters a self-cleaning filter for microfiltration, then enters an ultrafiltration device for ultrafiltration, the recovery rate is set to be 90%, the membrane flux is set to be 40LMH, and the quality of the effluent reaches that the turbidity is less than or equal to 0.2NTU and the SDI is less than or equal to 3; then the ultrafiltration produced water is sequentially sent to a primary cartridge filter, a primary reverse osmosis device, a secondary cartridge filter and a secondary reverse osmosis device. Wherein, the scale inhibitor, the reducing agent and the non-oxidizing bactericide are added before the ultrafiltration produced water enters the cartridge filter, and a PP melt-blown filter element with the aperture of 5 mu m is arranged in the cartridge filter; and adding a PH regulator before the primary reverse osmosis produced water enters the secondary cartridge filter.
(6) EDI desalination: and (3) feeding the water produced by the second-stage reverse osmosis into EDI, and performing refined desalting through continuous electric desalting to obtain regenerated water.
Foil washing wastewater adopted in the embodiment of the application: pH 3.4, phosphorus content 54mg/L, boron content 1.7mg/L, suspension concentration 825mg/L. The drugs, reagents, solvents, etc. used in the present application are all commercially available.
The present application is described in further detail below with reference to examples, performance test and accompanying description.
Example 1
Embodiment 1 provides a method for treating foil washing wastewater, comprising the following steps:
the application provides a treatment method of foil washing wastewater, which comprises the following steps:
(1) Regulating to destabilize: firstly, naOH is added into the foil washing wastewater to adjust the pH value of the foil washing wastewater to 7.2.
(2) Flocculation: to the foil washing wastewater were added a bactericide (Kathon, available from Shandong gold beautifier Co., ltd.), polyaluminum ferric chloride and polyacrylamide (available from Henan Alfock chemical Co., ltd.). Wherein, the addition of the bactericide is 0.15 per mill of the weight of the foil washing wastewater, the addition of the polyaluminum ferric chloride is 0.08 per mill of the weight of the foil washing wastewater, and the addition of the polyacrylamide is 0.001 per mill of the weight of the foil washing wastewater.
(3) Inclined plate sedimentation: and (5) delivering the flocculated water to an inclined plate sedimentation area, and staying for 60min.
(4) Coarse filtration: pumping the product water after the inclined plate sedimentation treatment into a multi-medium filter for preliminary coarse filtration; wherein, the multi-medium filter is filled with quartz sand and anthracite with the mass ratio of 2:1.
(5) Fine filtration: the produced water of the multi-medium filter enters a self-cleaning filter for microfiltration, then enters an ultrafiltration device for ultrafiltration, the recovery rate is set to be 90%, the membrane flux is set to be 40LMH, and the quality of the effluent reaches that the turbidity is less than or equal to 0.2NTU and the SDI is less than or equal to 3; then the ultrafiltration produced water is sequentially sent to a primary cartridge filter, a primary reverse osmosis device, a secondary cartridge filter and a secondary reverse osmosis device. Wherein, the ultrafiltration product water is added with a scale inhibitor (model DL-FST 581) and NaHSO before entering a cartridge filter 3 And a non-oxidizing bactericide (purchased from Wanzhu, product number 202101564), wherein a PP melt-blown filter element with a pore diameter of 5 μm is arranged in the cartridge filter; and adding a PH regulator before the primary reverse osmosis produced water enters the secondary cartridge filter.
(6) EDI desalination: and (3) feeding the water produced by the second-stage reverse osmosis into EDI, and performing refined desalting through continuous electric desalting to obtain regenerated desalted water.
Examples 2 to 7
Examples 2-7 provide a method for treating foil-washing wastewater,
the above embodiment differs from embodiment 1 in that: in the step (1), the amounts of polyaluminum ferric chloride and polyacrylamide added are shown in Table 1 below.
TABLE 1 amounts of polyaluminum ferric chloride and Polyacrylamide added in examples 2-7
Comparative example 1
Comparative example 1 provides a method for treating foil-washing wastewater,
the above comparative example is different from example 2 in that: in the step (1), the pH of the foil washing wastewater is regulated to 6.5.
Comparative example 2
Comparative example 2 provides a method of treating foil-washing wastewater,
the above comparative example is different from example 2 in that: in the step (1), the pH of the foil washing wastewater is adjusted to 9.8.
Comparative example 3
Comparative example 3 provides a method for treating foil-washing wastewater,
the above comparative example is different from example 2 in that: and (3) adding the polyaluminum ferric chloride in the step (1) to the mixture to be 0.
Comparative example 4
Comparative example 4 provides a method of treating foil-washing wastewater,
the above comparative example is different from example 2 in that: and (3) adding the polyacrylamide in the step (1) to an amount of 0.
Performance test
The various indexes of the reclaimed water obtained in examples 1 to 7 and comparative examples 1 to 4 were examined, and the results are shown in Table 2 below.
Detecting the pH value by adopting a pH tester; detecting the phosphorus content by adopting an MDS-830 online total phosphorus detector; detecting the boron content by adopting an azomethine-H acid photometry method; the method for detecting Suspended Substances (SS) in water comprises the following steps: the water sample is passed through a filter membrane with a pore size of 0.45 μm, is trapped on the filter membrane and is dried to a constant weight solid substance at 103-105 ℃.
TABLE 2 results of measurement of various indexes of the treated foil-washing water obtained in examples 1 to 7 and comparative examples 1 to 4
As can be seen from the detection results in Table 2, the treatment methods for foil-washing wastewater provided in examples 1 to 7 of the present application can reduce the phosphorus content in the foil-washing wastewater from 54mg/L to 5mg/L or less, the boron content from 1.7mg/L to 0.1mg/L or less, the suspended matter concentration from 825mg/L to 20mg/L or less, and the electrical conductivity to 0.5us/cm or less. After the treatment method of the foil washing wastewater of the comparative examples 1-4 is adopted, the phosphorus content of the obtained foil washing water is up to 6.7-10.1mg/L, the boron content is up to 0.12-0.24mg/L, and the suspended matter content is up to 21.2-43.3mg/L. Therefore, in the method for treating the foil washing wastewater, the pH value of the foil washing wastewater is adjusted to 7-8 in the primary treatment step, and then the polyaluminum ferric chloride and the polyacrylamide are added into the foil washing wastewater, so that phosphorus-containing substances, boron-containing substances and suspended substances in the foil washing wastewater can be effectively removed, and the treated foil washing water completely meets the sewage discharge standard.
In addition, the foil washing water treated by the treatment method of the foil washing wastewater provided by the application can be recycled, and the cost accounting of recycling the foil washing wastewater resource is performed by taking Xinjiang certain electronic materials as an example: cleaning water (foil-cleaning waste water) of chemical-formed foil production line of Xinjiang certain electronic materials limited company, and water quantity of first period is 200m 3 /h(4000m 3 And/d), the recovery rate of the wastewater is 90%, the operation cost of recovery equipment is not considered, but the water cost of 24000 yuan/day can be saved only by calculating according to the raw water saving, 720000 yuan is saved in month, 86 more than ten thousands yuan is saved in year, and if the pollution discharge cost is reduced, the economic benefit is quite considerable.
In summary, the treatment method of the foil washing wastewater can reduce the phosphorus content, the boron content, the suspended matter content and other impurity content in the foil washing wastewater, and the obtained treatment water can be used for each production workshop to realize the recycling of the wastewater, so that the problems of regional water resource shortage and high industrial water price and sewage disposal cost are solved, and the method has good economic benefit and popularization value.
While the invention has been described in detail in the foregoing general description and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (9)
1. The method for treating the foil washing wastewater is characterized by comprising the following steps of: tempering and destabilizing, flocculating, precipitating, filtering and desalting;
tempering and destabilizing: firstly, regulating the pH value of foil washing wastewater to 7-8;
flocculation: adding a bactericide, polyaluminium ferric chloride and polyacrylamide into the quenched and destabilized foil washing wastewater;
the pH of raw water of the foil washing wastewater is 3-4, the phosphorus content is 30-60mg/L, the boron content is 1-2mg/L, and the suspended matter concentration is 300-1000mg/L.
2. The method for treating foil-washing wastewater according to claim 1, wherein the addition amount of the bactericide is 0.05-0.15% by weight of the foil-washing wastewater, the addition amount of the polyaluminum ferric chloride is 0.03-0.21% by weight of the foil-washing wastewater, and the addition amount of the polyacrylamide is 0.0005-0.002% by weight of the foil-washing wastewater.
3. The method for treating foil washing wastewater according to claim 1, wherein the sedimentation is performed by using an inclined plate sedimentation, and the hydraulic total retention time SRT of the inclined plate sedimentation is 60-90min.
4. The method for treating foil washing wastewater according to claim 1, wherein the filtering includes coarse filtering and fine filtering; the coarse filtration adopts a multi-medium filter, and the multi-medium filter is filled with quartz sand and anthracite in a weight ratio of 2:1.
5. The method of claim 4, wherein the fine filtration comprises microfiltration, ultrafiltration, primary security filtration, primary reverse osmosis, secondary security filtration, and secondary reverse osmosis.
6. The method for treating foil washing wastewater according to claim 5, wherein the microfiltration is performed by a self-cleaning filter; the security filter adopts a security filter, and a PP melt-blown filter element with the aperture of 1-5 mu m is arranged in the security filter.
7. The method for treating foil washing wastewater according to claim 5, wherein in the ultrafiltration step, the recovery rate is set to 80-95%, the membrane flux is 30-70LMH, and the effluent quality reaches turbidity less than or equal to 0.2NTU and SDI less than or equal to 3.
8. The method for treating foil washing wastewater according to claim 5, wherein a scale inhibitor, a reducing agent and a non-oxidizing bactericide are added into the primary reverse osmosis inflow water before the primary security filtration; before the secondary security filtration, a PH regulator is added into the secondary reverse osmosis inflow water.
9. The method for treating foil washing wastewater according to claim 1, wherein EDI is used for desalting.
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| CN202410015588.1A CN117819760A (en) | 2024-01-03 | 2024-01-03 | Foil washing wastewater treatment method |
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| CN202410015588.1A CN117819760A (en) | 2024-01-03 | 2024-01-03 | Foil washing wastewater treatment method |
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| CN202410015588.1A Pending CN117819760A (en) | 2024-01-03 | 2024-01-03 | Foil washing wastewater treatment method |
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