CN206680301U - Heavy metal ion-containing waste water processing system - Google Patents
Heavy metal ion-containing waste water processing system Download PDFInfo
- Publication number
- CN206680301U CN206680301U CN201720347411.7U CN201720347411U CN206680301U CN 206680301 U CN206680301 U CN 206680301U CN 201720347411 U CN201720347411 U CN 201720347411U CN 206680301 U CN206680301 U CN 206680301U
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- China
- Prior art keywords
- heavy metal
- pond
- fixedly connected
- metal ion
- waste water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000002351 wastewater Substances 0.000 title claims abstract description 49
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 37
- 238000012545 processing Methods 0.000 title claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000010802 sludge Substances 0.000 claims abstract description 50
- 239000012528 membrane Substances 0.000 claims abstract description 42
- 238000005374 membrane filtration Methods 0.000 claims abstract description 36
- 230000037452 priming Effects 0.000 claims abstract description 10
- 238000010992 reflux Methods 0.000 claims description 13
- 239000002699 waste material Substances 0.000 claims description 13
- 238000004140 cleaning Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 238000001914 filtration Methods 0.000 abstract description 8
- 230000008901 benefit Effects 0.000 abstract description 4
- 239000010865 sewage Substances 0.000 description 23
- 150000002500 ions Chemical class 0.000 description 21
- 238000000108 ultra-filtration Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- 238000005086 pumping Methods 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000002033 PVDF binder Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 239000000701 coagulant Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical compound FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The utility model discloses a kind of heavy metal ion-containing waste water processing system, including membrane filtration pond, wastewater equalization pond and clear water reserviors, the membrane filtration pond passes through pipeline communication with wastewater equalization pond respectively, water pump is provided with the pipeline, the whole heavy metal ion-containing waste water processing system is connected with PLC, mounting bracket is fixedly connected with the membrane filtration pond, curtain hyperfiltration membrane assembly is fixedly connected with the mounting bracket, the curtain hyperfiltration membrane assembly is communicated with outlet conduit, water outlet self priming pump is provided with the outlet conduit, the outlet conduit connects with clear water reserviors.The utility model has the advantages that：Curtain type membrane is not easy by sludge blockage, and the filtering function of curtain type membrane can be given full play to, so that the clearance of heavy metal ion is higher.
Description
Technical field
Sewage disposal system is the utility model is related to, more particularly to a kind of heavy metal ion-containing waste water processing system.
Background technology
With the development of heavy industry, content of beary metal is exceeded to be one of an important factor for causing environmental pollution, heavy metal-polluted
Dye is administered still as the most important thing of current efforts at environmental protection.Traditional materialized method is as a kind of wide variety of heavy metal-polluted water process work
Skill is commonly used, but as the further raising of environmental requirement, Traditional materialized method gradually show following shortcoming：
1st, its heavy metal ion composition of general heavy metal ion-containing waste water is numerous and exists simultaneously, and in the production technology stage
It is difficult thoroughly shunting again, this causes very big constraint to traditional handicraft treatment effect；
2nd, traditional handicraft is by separation of solid and liquid forms such as precipitation, air supportings, it is desirable to generates alumina blossom particles footpath and increases bonus point from effect
Fruit, so as to a large amount of dosing coagulants and flocculant, produce a large amount of sludge；
3rd, separating effect is not good enough, and standard water discharge is unstable.
Therefore occurs a kind of sewage disposal system as shown in Figure 5 in the prior art, including cesspool 29 and PUF surpass
Filter component 30.PUF ultrafiltration modules 30 are made of enhanced modified polypropene hollow-fibre membrane, have the spy of high-intensity high-tenacity
Point, it can work under severe conditions without damaging.Sewage in cesspool is extracted into by PUF ultrafiltration modules by suction pump
In 30, then clear water is discharged from the discharge outlet 31 of ultrafiltration module, and sludge is discharged from the sewage draining exit 32 of PUF ultrafiltration modules 30.But
Problems be present in the heavy metal ion-containing waste water processing system：By the way that water and sludge are passed through into PUF ultrafiltration modules 30 jointly, make
Obtain partial sludge to be deposited in PUF ultrafiltration modules 30, cause PUF ultrafiltration modules 30 to block.The heavy metal of PUF ultrafiltration modules 30 from
The treatment effect of son is bad or even fails.
Utility model content
The purpose of this utility model is to provide a kind of heavy metal ion-containing waste water processing system, and its advantage is curtain type membrane
It is not easy by sludge blockage, the filtering function of curtain type membrane is given full play to, so that the clearance of heavy metal ion is higher.
Above-mentioned technical purpose of the present utility model technical scheme is that：One kind contains heavy metal ion
Waste Water Treatment, including membrane filtration pond, wastewater equalization pond and clear water reserviors, the membrane filtration pond lead to wastewater equalization pond respectively
Piping is connected, and water pump is provided with the pipeline, and the whole heavy metal ion-containing waste water processing system is connected with PLC controls
Device processed, mounting bracket is fixedly connected with the membrane filtration pond, curtain hyperfiltration membrane assembly is fixedly connected with the mounting bracket, it is described
Curtain hyperfiltration membrane assembly is communicated with outlet conduit, is provided with water outlet self priming pump on the outlet conduit, the outlet conduit with it is clear
Pond connects.
After above-mentioned technical proposal, sewage is conveyed by water pump and is sucked out and enters from wastewater equalization pond
In membrane filtration pond.Sludge settling is in the bottom in membrane filtration pond.Start water outlet self priming pump.Water outlet self-priming pump work so that water outlet is certainly
Sucking pump forms negative pressure in outlet conduit.Water is inhaled into outlet conduit, is then entered along outlet conduit in clear water reserviors.It is above-mentioned
During, because water must be first passed through in curtain hyperfiltration membrane assembly when entering outlet conduit so that curtain hyperfiltration membrane assembly pair
Membrane filtration is carried out by the water of curtain hyperfiltration membrane assembly.Because the sludge settling in sewage is in membrane filtration bottom of pond portion so that sludge
Greatly reduced along water by the amount of curtain hyperfiltration membrane assembly so that curtain hyperfiltration membrane assembly is not easy by sludge blockage.Membrane filtration
The content of beary metal in sewage reduces afterwards, and enters along outlet conduit in clear water reserviors.Sludge settling is in film in said process
Filtering ponds bottom, the amount that the sludge swum in sewage enters curtain hyperfiltration membrane assembly are relatively low so that curtain hyperfiltration membrane assembly is not
Easily by sludge blockage.Prior art is compared to, curtain hyperfiltration membrane assembly can give full play to its filtering function, heavy metals removal
Rate is higher.
The utility model is further arranged to：The membrane filtration bottom of pond portion is fixedly connected with blow-off line, the blow-off pipe
Automatic electric valve is provided with road, the blow-off line is fixedly connected with sludge pump, and the sludge pump other end is fixedly connected with phase
Same blow-off line, the blow-off line are communicated with sludge dewatering equipment.
After above-mentioned technical proposal, after certain sludge is put aside in membrane filtration bottom of pond portion, PLC will be automatic
Electric valve is opened, and starts sludge pump.Sludge pump startup causes sludge by automatic electric valve and entered in blow-off line, and leads to
Blow-off line is crossed to enter in sludge dewatering equipment.The sludge entered in sludge dewatering equipment is dehydrated by sludge dewatering equipment work.
The utility model is further arranged to：The sludge dewatering equipment is fixedly connected with aqueduct, the aqueduct
Water-delivery pump is fixedly connected with, the water-supply-pipe other end is fixedly connected with same aqueduct, the aqueduct and film mistake
Filter tank connects.
After above-mentioned technical proposal, the water deviate from from sludge is by entering water-supply-pipe in the presence of water-delivery pump
Road, and membrane filtration pond is come back to by aqueduct.Said process is recycled sewage, has been reached and has been economized on resources
Purpose.Sewage progress multiple times of filtration can significantly be reduced to the content of beary metal in sewage, prevent sewage from being made to environment
Into pollution.
The utility model is further arranged to：The clear water reserviors side is provided with reflux line, and the reflux line is fixed
Anti- cleaning pump is connected with, the anti-cleaning pump is fixedly connected with identical reflux line, and the reflux line is communicated with membrane filtration
Pond.
After above-mentioned technical proposal, in certain time, the anti-cleaning pump startup of PLC driving, anti-cleaning pump
Drive the water in clear water reserviors to enter reflux line, then come back in membrane filtration pond, so as to be carried out to curtain hyperfiltration membrane assembly
Recoil, the sludge on curtain hyperfiltration membrane assembly surface is rinsed from curtain hyperfiltration membrane assembly.Water in clear water reserviors passes through again
Secondary filter is crossed, further reduces the content of heavy metal ion therein.
The utility model is further arranged to：The wastewater equalization pond is communicated with waste pipe, and the waste pipe is fixed
Waste water lifting pump is connected with, the waste water lifting pump other end is fixedly connected with identical waste pipe, and the waste pipe connects
It is connected with processing pond.
After above-mentioned technical proposal, by starting waste water lifting pump so that sewage is by waste pipe at
Manage in pond so that waste water can pass through certain pretreatment.
The utility model is further arranged to：PH testers and material feeding device are provided with the processing pond.
After above-mentioned technical proposal, the pH value of the sewage entered by the test of PH testers in processing pond, and
Contact break agent, heavy metal capturing agent are launched into processing pond in material feeding device so that heavy metal ion is assembled, from
And the sewage in processing pond is pre-processed.
In summary, the utility model has the advantages that：
1st, curtain hyperfiltration membrane assembly has efficient solid-liquid separation capability.Curtain milipore filter membrane material uses PTFE, PVDF,
Film wire micropore even compact, 0.1 ~ 0.2 μm of aperture is separated, flux is big and filtering accuracy is high.Especially PTFE, it is commonly called as " plastics
King ", formed by tetrafluoroethene is aggregated, there is excellent resistance to physics and chemical property, heatproof, light aging resisting, resistance to strong acid are strong
Alkali, antipollution, thoroughly Chemical cleaning solve conventional membrane pollution problem.Therefore by setting curtain hyperfiltration membrane assembly, open
Dynamic water outlet self priming pump aspirates in the liquid level of membrane filtration pond upper strata.Because the sludge content of floating is less so that the sludge in sewage
Amount by curtain hyperfiltration membrane assembly is less, and curtain hyperfiltration membrane assembly is not easily blocked so that curtain hyperfiltration membrane assembly gives full play to
Its filtering function, so as to improve removal of heavy metal ions rate.Curtain hyperfiltration membrane assembly can be by the heavy metal ion in sewage
It is isolated in outside curtain hyperfiltration membrane assembly so that sewage passes through after certain processing in outlet conduit injected clear water pond,
Reach the effect of processing heavy metal ions in sewage；
2nd, heavy metal ion-containing waste water processing system processing heavy metal ion-containing waste water, it is only necessary to launch contact break agent and a huge sum of money
Belong to ion-trapping agent, without dosing coagulant, flocculant, so as to greatly reduce sludge yield.Most of sludge containing heavy metal
Harmless treatment need to be done via the disposal unit for having corresponding qualification as dangerous solid waste, therefore mud decrement is looked forward to for pollution
The production cost of industry brings very big economic benefit；
3rd, heavy metal ion-containing waste water processing system is using modular combination, the control of wastewater treatment whole-course automation, sludge
Discharge automatic modeization to perform, reduce hand labor intensity to a greater extent, it is ensured that safe operation steady in a long-term；
4th, by setting the effect of sludge dewatering equipment so that sludge dewatering equipment deviates from the moisture in sludge, and again
It is back in membrane filtration pond, reaches and repeatedly sewage is handled so that the concentration of heavy metal ion in sewage substantially reduces, from
And improve the degree for the treatment of to sewage.
Brief description of the drawings
Fig. 1 is the structural representation of embodiment；
Fig. 2 is embodiment wastewater equalization pond and the structural representation of processing pond；
Fig. 3 is the structural representation of embodiment membrane filtration pond and clear water reserviors；
Fig. 4 is the exploded perspective view of curtain hyperfiltration membrane assembly in embodiment；
Fig. 5 is the structural representation of prior art.
Reference：1st, wastewater equalization pond；2nd, waste pipe；3rd, processing pond；4th, electronic valve；5th, waste water lifting pump；6、
PH testers；7th, material feeding device；8th, pumping conduit；9th, Water-pumping valve；10th, suction pump；11st, membrane filtration pond；12nd, install
Frame；13rd, curtain hyperfiltration membrane assembly；14th, outlet conduit；15th, flowing water Valve；16th, water outlet self priming pump；17th, clear water reserviors；18th, blowdown
Pipeline；19th, automatic electric valve；20th, sludge pump；21st, sludge dewatering equipment；23rd, reflux line；24th, return valve；25th, anti-cleaning pump；
26th, PTFE film；27th, aqueduct；28th, water-delivery pump；29th, cesspool；30th, PUF ultrafiltration modules；31st, discharge outlet；32nd, sewage draining exit.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
This specific embodiment is only that it is not to limitation of the present utility model, ability to explanation of the present utility model
Field technique personnel can make the modification of no creative contribution to the present embodiment as needed after this specification is read, but
As long as all protected in right of the present utility model by Patent Law.
A kind of heavy metal ion-containing waste water processing system, as depicted in figs. 1 and 2, including wastewater equalization pond 1.Waste water is adjusted
The waste water containing heavy metal ion is first collected in pond 1, avoids the change due to instantaneous water quality and quantity from impacting follow-up system.Waste water
Waste pipe 2 is provided with regulating reservoir 1, waste pipe 2 connects processing pond 3.Electronic valve is disposed with waste pipe 2
4 and waste water lifting pump 5, the keying of electronic valve 4 and waste water lifting pump 5 is controlled by PLC, so as to utilize waste water
Elevator pump 5 is by waste water lifting to processing pond 3.
As shown in Figures 2 and 3, PH testers 6 are provided with the side of processing pond 3, PH testers 6 can be used for detecting waste water
PH value.The opposite side of processing pond 3 is provided with material feeding device 7, for launching contact break agent, heavy metal capturing agent.
Pumping conduit 8 is connected with processing pond 3, Water-pumping valve 9, suction pump 10 are disposed with pumping conduit 8.Controlled by PLC
The keying of device control Water-pumping valve 9 and suction pump 10 processed.The one end of pumping conduit 8 away from processing pond 3 is communicated with membrane filtration pond
11。
As shown in figure 3, being welded with mounting bracket 12 in membrane filtration pond 11, curtain hyperfiltration membrane assembly is installed on mounting bracket 12
13.Curtain milipore filter membrane module 13 includes PTFE, PVDF, wherein film wire micropore even compact, and flux is big and filtering accuracy is high.Its
Middle PTFE, formed by tetrafluoroethene is aggregated, there is excellent resistance to physics and chemical property, heatproof, light aging resisting, resistance to strong acid
Highly basic, resistant to pollution characteristic.
As shown in figure 4, several PTFE films 26 are fixedly connected with curtain hyperfiltration membrane assembly 13, in curtain hyperfiltration membrane assembly
13 tops are provided centrally with outlet conduit 14, and flowing water Valve 15, water outlet self priming pump 16 are disposed with outlet conduit 14,
PLC controls the keying of flowing water Valve 15 and water outlet self priming pump 16.As shown in figure 3, outlet conduit 14 is away from membrane filtration
The one end in pond 11 is communicated with clear water reserviors 17.Start water outlet self priming pump 16.Impurity in the filtered wastewater of curtain hyperfiltration membrane assembly 13, goes out
For water self priming pump 16 by negative pressure by the clear liquid suction-discharge in waste water to clear water reserviors 17, sludge is then deposited in membrane filtration pond 11
Bottom.
As shown in figure 3, being fixedly connected with blow-off line 18 in the bottom in membrane filtration pond 11, set gradually on blow-off line 18
There are automatic electric valve 19 and sludge pump 20, the keying of automatic electric valve 19 and sludge pump 20 is controlled by PLC.Blow-off pipe
The one end of road 18 away from membrane filtration pond 11 is communicated with sludge dewatering equipment 21, and the side of sludge dewatering equipment 21 is provided with aqueduct
27, water-delivery pump 28 is provided with aqueduct 27.After startup certain time is set, PLC control automatic electric valve 19 is beaten
Open, start sludge pump 20 and water-delivery pump 28, the sludge of the bottom of pond of membrane filtration pond 11 is delivered in sludge dewatering equipment 21 and is dehydrated, it is dehydrated
Caused water is transported to circular treatment in membrane filtration pond 11 by aqueduct 27 in journey.
As shown in figure 3, being connected with reflux line 23 in the side of clear water reserviors 17, backflow is disposed with reflux line 23
Valve 24 and anti-cleaning pump 25.PLC controls anti-cleaning pump 25 to open, so as to start anti-cleaning pump 25.Anti- cleaning pump
25 deliver to the clear liquid in clear water reserviors 17 in membrane filtration pond 11 along reflux line recoil so that clear liquid is to curtain hyperfiltration membrane assembly
13 produce certain repercussion effect, by the sludge being attached on curtain hyperfiltration membrane assembly 13 in the presence of the impulse force of water from curtain
It is cleaned on hyperfiltration membrane assembly 13.The clear liquid that recoil enters in membrane filtration pond 11 is by the mistake again of curtain hyperfiltration membrane assembly 13
Filter, further reduces heavy metal ion content therein.
Claims (6)
1. a kind of heavy metal ion-containing waste water processing system, including membrane filtration pond (11), wastewater equalization pond (1) and clear water reserviors
(17), the membrane filtration pond (11) is provided with water pump respectively with wastewater equalization pond (1) by pipeline communication on the pipeline,
It is characterized in that：The whole heavy metal ion-containing waste water processing system is regulated and controled by PLC, in the membrane filtration pond (11)
Mounting bracket (12) is fixedly connected with, is fixedly connected with curtain hyperfiltration membrane assembly (13) on the mounting bracket (12), the curtain surpasses
Filter membrane component (13) is communicated with outlet conduit (14), is provided with water outlet self priming pump (16) on the outlet conduit (14), it is described go out
Waterpipe (14) connects with clear water reserviors (17).
2. heavy metal ion-containing waste water processing system according to claim 1, it is characterized in that：Membrane filtration pond (11) bottom
Portion is fixedly connected with blow-off line (18), and automatic electric valve (19), the blow-off line are provided with the blow-off line (18)
(18) sludge pump (20) is fixedly connected with, sludge pump (20) other end is fixedly connected with identical blow-off line (18), institute
State blow-off line (18) and be communicated with sludge dewatering equipment (21).
3. heavy metal ion-containing waste water processing system according to claim 2, it is characterized in that：The sludge dewatering equipment (21)
Aqueduct (27) is fixedly connected with, the aqueduct (27) is fixedly connected with water-delivery pump (28), the water-supply-pipe other end
Same aqueduct (27) is fixedly connected with, the aqueduct (27) connects with membrane filtration pond (11).
4. heavy metal ion-containing waste water processing system according to claim 1, it is characterized in that：Clear water reserviors (17) side
Reflux line (23) is provided with, the reflux line (23) is fixedly connected with anti-cleaning pump (25), and the anti-cleaning pump (25) is solid
Surely identical reflux line (23) is connected with, the reflux line (23) is communicated with membrane filtration pond (11).
5. heavy metal ion-containing waste water processing system according to claim 1, it is characterized in that：The wastewater equalization pond (1)
Waste pipe (2) is communicated with, the waste pipe (2) is fixedly connected with waste water lifting pump (5), and the waste water lifting pump (5) is another
One end is fixedly connected with identical waste pipe (2), and the waste pipe (2) is communicated with processing pond (3).
6. heavy metal ion-containing waste water processing system according to claim 1, it is characterized in that：Set in the processing pond (3)
It is equipped with PH testers (6) and material feeding device (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720347411.7U CN206680301U (en) | 2017-04-05 | 2017-04-05 | Heavy metal ion-containing waste water processing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720347411.7U CN206680301U (en) | 2017-04-05 | 2017-04-05 | Heavy metal ion-containing waste water processing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206680301U true CN206680301U (en) | 2017-11-28 |
Family
ID=60399240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720347411.7U Expired - Fee Related CN206680301U (en) | 2017-04-05 | 2017-04-05 | Heavy metal ion-containing waste water processing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206680301U (en) |
-
2017
- 2017-04-05 CN CN201720347411.7U patent/CN206680301U/en not_active Expired - Fee Related
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171128 Termination date: 20210405 |
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| CF01 | Termination of patent right due to non-payment of annual fee |