CN207552128U - A kind of device of integrated membrane process hydridization removal low concentration selenium-containing wastewater - Google Patents
A kind of device of integrated membrane process hydridization removal low concentration selenium-containing wastewater Download PDFInfo
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- CN207552128U CN207552128U CN201721553543.1U CN201721553543U CN207552128U CN 207552128 U CN207552128 U CN 207552128U CN 201721553543 U CN201721553543 U CN 201721553543U CN 207552128 U CN207552128 U CN 207552128U
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Abstract
The utility model discloses a kind of devices of integrated membrane process hydridization removal low concentration selenium-containing wastewater, including pre-processing intake pool, RO/NF membrane filtration systems, standard discharge selenium-containing wastewater pond, sulfate removes agitating reaction pond, sulfate precipitation pond, selenium removes agitating reaction pond, selenium sedimentation basin and incrustation ion abatement pond, wherein pretreatment intake pool liquid outlet is connected by pipeline with RO/NF membrane filtration system inlets, RO/NF membrane filtration systems filtering production water liquid outlet is connected by pipeline with standard discharge selenium-containing wastewater pond inlet, RO/NF membrane filtration system concentrated waters liquid outlet removes agitating reaction pond inlet with sulfate by pipeline respectively and selenium removes agitating reaction pond inlet and is connected.The utility model uses the technology that pretreatment+membrane filtration+adsorption precipitation+ion exchange is combined, and the removal rate of selenium in water is made to be up to more than 85%, so as to effectively save water consumption, reduces pollution of the selenium to environment of exceeded concentration.
Description
Technical field
The utility model belongs to the Integrated Processing Unit technical field of selenium-containing wastewater in water-saving and emission-reducing, and in particular to Yi Zhongji
Membrane formation process hydridization removes the device of low concentration selenium-containing wastewater.
Background technology
Selenium is micronutrient element necessary to human body, has anticancer and antioxidation, can enhance body immunity.
But selenium intake is excessive, human body will appear the symptom of poisoning, and the animals such as birds and fish then show as the dead, abnormal of its embryo
Shape and the symptoms such as survival rate is low after hatching.Because selenium element non-uniform distribution in the earth's crust, such as due to the discharge from mining industry
Waste water, the waste water flowed out from the flyash of combustion of fossil fuel or outer row's runoff from large-scale agricultural irrigation cistern, make water
The phenomenon that body is contaminated, and selenium is exceeded is on the rise.U.S.EPA sets the maximum concentration content of selenium element in drinking water
For 0.05mgL−1, in Chinese sewage discharge required standard, the first grade discharging concentration of selenium needs<0.1mg·L−1。
With advances in technology and further stringent environmental protection limitation, related factories enterprise plan are dense selenium total in discharging any waste liquor
Degree is further cut down to μ gL−1Rank.Unquestionably, this is a challenging technical barrier, because selenium is in water body
Usually by it is a variety of it is different in the form of exist, and the selenium element form of treated concentrate residue is cured, no longer again
Release.Removal selenium or the technical method for declining selenium concentration have very much, and four major class are broadly divided into according to their principle：Standardization
It is reverse osmosis（RO）, nanofiltration（NF）Or ion exchange（IX）Embrane method desalting technology, based on addition FeOOH or activated carbon etc.
Adsorption technology and microbial process and chemical reduction procedure.But during specific processing method is screened, frequently encounter two spine
The problem of hand, the i.e. processing method, are to different valence state selenium in same water body（Such as Se6+And Se4+）Show the removal effect of differentiation
Fruit；Some the intermediate organic compounds generated in processing procedure（Such as selenium cyanic acid）With other addition ions（Such as sulfate radical）Poison
Property effect.Although the method for traditional chemistry or materializing strategy water containing selenium is effective, the high concentration for needing subsequent processing can be generated
Waste liquid and waste residue, inadequate economical and efficient；It in reaction time of the bioremediation due to needing more than a few hours, inevitably needs
The pending selenium-containing wastewater of a large amount of volumes is stagnated in bioreactor, so as to increase the floor space of processing unit and dirt
Cost of water treatment.
RO films are that a kind of its both sides static pressure difference that is based on is driving force, so as to fulfill the Selective Separation skill to liquid mixture
Art, RO films only allow aqueous solvent to penetrate so as to retain other each inorganic ions or small-molecule substance, it is light to be widely used to seawater
The fields such as change, brackish water desalination and wastewater treatment.NF films are referred to as the RO films of " loose type ", have to divalent and multivalent ion aobvious
The rejection of work, the characteristic cause it to have potential application prospect during by the water body of heavy metal pollution in processing, in recent years
Come during the waste water of the reported high content of beary metal of NF film process, to the removal rate of heavy metal generally more than 80%.But
It is but poor to selenite removal effect while selenate to be that NF films can effectively remove, although and RO films can be realized effectively
Selenate and selenite are removed, but faces the serious fouling membrane phenomenon of irreversibility, contains selenium so as to inevitably increased
The processing cost of waste water.The existing patent about selenium-containing wastewater processing method is more, and Publication No. CN 104556540A's is special
Profit discloses a kind of processing method of selenium-containing wastewater, is obtained including ozone oxidation, Aerobic biological process and flocculation sediment except selenium
Waste water afterwards, this method suitable high-concentration waste water easy to operate, but to low concentration wastewater treatment effect unobvious, and give up to containing selenium
The ratio of selenic acid radical ion and selenite radical ion in water has specific limit to require.Publication No. CN 102358653A are special
Profit discloses a kind of two-stage except selenium handles selenium-containing wastewater method, after pH value of waste water is adjusted to 1-4 by addition Waste Sulfuric Acid first, adds in also
Former agent removes part selenium；The second level, which adds in molysite and passes through carbide slag conditioning agent, adjusts pH value of waste water between 8-10, utilizes
The suction-operated depth of hydrolysate removes selenium, right although this method operation is simple and reduces to a certain degree total Se content
While the removal of selenite is effective, if in the presence of pollutant is in the form of selenate, the removal effect of selenium is very limited.
Utility model content
The utility model is to solve current monotechnics to be difficult to effectively remove the selenium of different valence state and form in water, it is impossible to be reached
To further stringent emission request, i.e., the problems such as waste water resource causes seriously to pollute to environment again, and provide a kind of integrated
Embrane method hydridization removes the device of low concentration selenium-containing wastewater, and pretreatment+membrane filtration+adsorption precipitation+ion exchange is used to be combined
Technology, the removal rate of selenium in water is made to be up to more than 85%, so as to effectively save water consumption, reduces the selenium of exceeded concentration to environment
Pollution, this technique main body and corollary equipment are compact-sized, multiple functional, easily operated repair, and arrangement mode can be flexible group
It closes.
The utility model adopts the following technical scheme that a kind of integrated membrane process hydridization removal is low dense to solve above-mentioned technical problem
Spend the method for selenium-containing wastewater, it is characterised in that detailed process is：
（1）Pretreated production water is discharged into RO/NF membrane filtration systems, the production water after the filtering of RO/NF membrane filtration systems
Standard discharge selenium-containing wastewater pond is directly discharged into since selenium concentration significantly reduces, wherein the production water rate of recovery of RO/NF membrane filtration systems
For 50%-80%, RO/NF films are to rejection >=90% of selenium；
（2）As sulfate concentration≤200mgL in RO/NF membrane filtration system concentrated waters−1When RO/NF membrane filtration systems is dense
Water is discharged into selenium removal agitating reaction pond；As sulfate concentration ＞ 200mgL in RO/NF membrane filtration system concentrated waters−1When by RO/NF
Membrane filtration system concentrated water is discharged into sulfate removal agitating reaction pond, and is removed to sulfate and milk of lime tune is added in agitating reaction pond
The pH value for saving mixed system is 8-10, and the solution after precipitation reaction occurs and enters sulfate precipitation pond, sinks through sulfate precipitation pond
Sulfate concentration, which significantly reduces, in supernatant behind shallow lake is discharged into selenium removal agitating reaction pond, and the part in sulfate precipitation bottom of pond portion sinks
Shallow lake is back in sulfate removal agitating reaction pond causes precipitation reaction as precipitation initiator；
（3）It is removed to selenium and metallic iron or Zero-valent Iron is added in agitating reaction pond, iron selenium reaction generation iron/selenium metallization occurs
Object or ferrous iron/iron hydroxide/selenium metallic compound are closed, selenium removal agitating reaction pond produces 25 μ gL of selenium concentration ＜ in water−1It is discharged into
Selenium sedimentation basin, the production water rate of recovery >=95% of the process；Or removed in agitating reaction pond to selenium and add in oxidant, it will be in water
Selenite is completely converted into selenate, then progress Anaerobic Treatment reduction Se content, the production water rate of recovery >=95% of the process,
Oxidant is Fenton reagent, perchloric acid or potassium bichromate；
（4）Selenium removal agitating reaction pond production water occurs to realize effectively removing for selenium except selenium precipitation reaction in selenium sedimentation basin,
Part supernatant is discharged into standard discharge selenium-containing wastewater pond, selenium precipitation in selenium sedimentation basin after being combined with RO/NF membrane filtration systems production water
Another part supernatant, which is discharged into after incrustation ion abatement pond is handled, in pond enters RO/NF membrane filtration systems.
Further preferably, Se in the pretreated production water6+Or Se4+A concentration of 25-300 μ gL−1, sulfate
A concentration of 300-2000mgL−1。
Further preferably, the RO/NF membrane filtration systems are using one or more NF/RO film cascades composition or using two
Section/multistage pattern of rows and columns i.e. one section NF/RO membrane filtration systems concentrated water passes through next section of NF/RO membrane filtration system.
Further preferably, the selenium sedimentation basin production water is effective by strong-acid cation exchange process in incrustation ion cuts down pond
Remove Ca remaining in selenium sedimentation basin production water2+, so as to suppress or eliminate subsequently to entering RO/NF membrane filtration system film surfaces fouling dirt
Dye；Or the selenium sedimentation basin production water effectively inhibits CaSO in incrustation ion cuts down pond by adding antisludging agent4Generation, so as to
Suppress or eliminate subsequently to entering RO/NF membrane filtration system film surface scaling foulings, the antisludging agent is polyacrylic acid, poly or
Maleic anhydride copolymer.
Further preferably, the metallic iron is a branch of made of mild steel, the steel wire or steel wool of soft material.
The device of integrated membrane process hydridization removal low concentration selenium-containing wastewater described in the utility model, it is characterised in that including pre-
Handle intake pool, RO/NF membrane filtration systems, standard discharge selenium-containing wastewater pond, sulfate removal agitating reaction pond, sulfate precipitation
Pond, selenium removal agitating reaction pond, selenium sedimentation basin and incrustation ion abatement pond, wherein pretreatment intake pool liquid outlet by pipeline with
RO/NF membrane filtration system inlets are connected, and RO/NF membrane filtration systems filtering production water liquid outlet contains selenium by pipeline and standard discharge
Wastewater disposal basin inlet is connected, and RO/NF membrane filtration system concentrated waters liquid outlet removes agitating reaction pond by pipeline and sulfate respectively
Inlet is connected with selenium removal agitating reaction pond inlet, as sulfate concentration≤200mg in RO/NF membrane filtration system concentrated waters
L−1When, RO/NF membrane filtration systems concentrated water is connected with selenium removal agitating reaction pond, when sulfate in RO/NF membrane filtration system concentrated waters
Concentration ＞ 200mgL−1When, RO/NF membrane filtration systems concentrated water is connected with sulfate removal agitating reaction pond, and sulfate removal is stirred
It mixes reaction tank supernatant liquid outlet by pipeline with sulfate precipitation pond inlet to be connected, sulfate precipitation pond mud discharging mouth passes through pipe
Road is connected with sulfate removal agitating reaction pond, and sulfate precipitation pond supernatant liquid outlet is stirred to react by pipeline and selenium removal
Pond inlet is connected, and selenium removal agitating reaction pond supernatant liquid outlet is connected by pipeline with selenium sedimentation basin, selenium sedimentation basin supernatant
Liquid liquid outlet cuts down pond inlet with standard discharge selenium-containing wastewater pond inlet and incrustation ion respectively by pipeline and is connected, into dirt
Ion abatement pond liquid outlet is connected by pipeline with RO/NF membrane filtration system inlets.
The utility model provides a flexible and efficient integrated membrane process hybridization technique for being used to handle selenium-containing wastewater, the skill
Art is not limited to selenate（SeO4 2−）Or selenite（SeO3 2−）Valence state or morphological differences, after process in externally discharged waste water
The μ gL of the concentration of dissolubility selenium≤25−1Or≤10 μ gL−1Or reduce to lower concentration.
The utility model has the advantages that compared with prior art：The utility model is a flexible and efficient place
The integrated process of selenium-containing wastewater is managed, is not limited to the complicated valence state such as selenite or selenate and form, treated produces water
The concentration of middle selenium is less than 25 μ gL−1, by the production water of pretreatment by NF/RO film process after, the removal rate of selenium more than 90%, from
And make NF/RO films production water can direct qualified discharge；Made in its component by adding milk of lime in NF/RO membrane filtration system concentrated waters
The precipitations such as calcium salt, magnesium salts, sulfate efficiently separate, selenium removal agitating reaction pond in by add metallic iron generate ferroselenium precipitation from
And Se content in NF/RO film concentrated waters is effectively removed, and flow back supernatant, while ensureing to be up to more than 80% to the removal rate of selenium,
Also the system production water rate of recovery of selenium-containing wastewater treatment process is effectively increased, reduces pollution of the selenium contamination object to environment, and
Achieve the purpose that mitigate fouling membrane and prolonging service lifetime of film.
Description of the drawings
Fig. 1 is the apparatus structure schematic diagram of integrated membrane process hydridization removal low concentration selenium-containing wastewater in the utility model.
In figure：1- pretreatment intake pools, 2-RO/NF membrane filtration systems, 3- standard discharge selenium-containing wastewaters pond, 4- sulfate are gone
Except agitating reaction pond, 5- sulfate precipitations pond, 6- selenium removal agitating reaction pond, 7- selenium sedimentation basins, 8- incrustation ions abatement pond.
Specific embodiment
The particular content of the utility model is described in detail with reference to attached drawing.
As shown in Figure 1, the device of integrated membrane process hydridization removal low concentration selenium-containing wastewater include pretreatment intake pool 1,
RO/NF membrane filtration systems 2, standard discharge selenium-containing wastewater pond 3, sulfate removal agitating reaction pond 4, sulfate precipitation pond 5, selenium are gone
Except agitating reaction pond 6, selenium sedimentation basin 7 and incrustation ion cut down pond 8, wherein pretreatment 1 liquid outlet of intake pool passes through pipeline and RO/
2 inlet of NF membrane filtration systems is connected, and the filtering production water liquid outlet of RO/NF membrane filtration systems 2 contains selenium by pipeline and standard discharge
3 inlet of wastewater disposal basin is connected, and 2 concentrated water liquid outlet of RO/NF membrane filtration systems is stirred to react respectively by pipeline and sulfate removal
4 inlet of pond and selenium removal 6 inlet of agitating reaction pond are connected, when sulfate concentration in 2 concentrated water of RO/NF membrane filtration systems≤
200mg·L−1When, 2 concentrated water of RO/NF membrane filtration systems is connected with selenium removal agitating reaction pond 6, when RO/NF membrane filtration systems 2 are dense
Sulfate concentration ＞ 200mgL in water−1When, 2 concentrated water of RO/NF membrane filtration systems is connected with sulfate removal agitating reaction pond 4,
Sulfate removal 4 supernatant liquid outlet of agitating reaction pond is connected by pipeline with 5 inlet of sulfate precipitation pond, sulfate precipitation
5 mud discharging mouth of pond removes agitating reaction pond 4 with sulfate by pipeline and is connected, and 5 supernatant liquid outlet of sulfate precipitation pond passes through pipe
Road is connected with selenium removal 6 inlet of agitating reaction pond, and selenium removes 6 supernatant liquid outlet of agitating reaction pond and precipitated by pipeline and selenium
Pond 7 be connected, 7 supernatant liquid outlet of selenium sedimentation basin by pipeline respectively with 3 inlet of standard discharge selenium-containing wastewater pond and into dirt from
Son abatement 8 inlet of pond is connected, and incrustation ion abatement 8 liquid outlet of pond passes through pipeline and 2 inlet phase of RO/NF membrane filtration systems
Even.
The detailed process of the method for integrated membrane process hydridization removal low concentration selenium-containing wastewater is：
（1）Pretreated production water is discharged into RO/NF membrane filtration systems, the production water after the filtering of RO/NF membrane filtration systems
Standard discharge selenium-containing wastewater pond is directly discharged into since selenium concentration significantly reduces, wherein the production water rate of recovery of RO/NF membrane filtration systems
For 50%-80%, RO/NF films are to rejection >=90% of selenium；
（2）As sulfate concentration≤200mgL in RO/NF membrane filtration system concentrated waters−1When RO/NF membrane filtration systems is dense
Water is discharged into selenium removal agitating reaction pond；As sulfate concentration ＞ 200mgL in RO/NF membrane filtration system concentrated waters−1When by RO/NF
Membrane filtration system concentrated water is discharged into sulfate removal agitating reaction pond, and is removed to sulfate and milk of lime tune is added in agitating reaction pond
The pH value for saving mixed system is 8-10, and the solution after precipitation reaction occurs and enters sulfate precipitation pond, the solid sludges of generation sink
It forms sediment to the bottom in sulfate precipitation pond, reduces sulphates content, the wherein content of sulfate is less than 1000 mgL−1, part
Sulfate sludge reflux to sulfate is removed as the root for causing precipitation in stirred reactor, after the precipitation of sulfate precipitation pond
Supernatant in sulfate concentration significantly reduce and be discharged into selenium removal agitating reaction pond, the partly precipitated in sulfate precipitation bottom of pond portion returns
It is back in sulfate removal agitating reaction pond and causes precipitation reaction as precipitation initiator；
（3）It is removed to selenium and metallic iron or Zero-valent Iron is added in agitating reaction pond, iron selenium reaction generation iron/selenium metallization occurs
Object or ferrous iron/iron hydroxide/selenium metallic compound are closed, selenium removal agitating reaction pond produces 25 μ gL of selenium concentration ＜ in water−1It is discharged into
Selenium sedimentation basin, the production water rate of recovery >=95% of the process；Or removed in agitating reaction pond to selenium and add in oxidant, it will be in water
Selenite is completely converted into selenate, then progress Anaerobic Treatment reduction Se content, the production water rate of recovery >=95% of the process,
Oxidant is Fenton reagent, perchloric acid or potassium bichromate；
（4）Selenium removal agitating reaction pond production water occurs to realize effectively removing for selenium except selenium precipitation reaction in selenium sedimentation basin,
Part supernatant is discharged into standard discharge selenium-containing wastewater pond, selenium precipitation in selenium sedimentation basin after being combined with RO/NF membrane filtration systems production water
Another part supernatant, which is discharged into after incrustation ion abatement pond is handled, in pond enters RO/NF membrane filtration systems.
Se in the pretreated production water6+Or Se4+A concentration of 25-300 μ gL−1, a concentration of 300- of sulfate
2000mg·L−1, selenium concentration is 80-9000 μ gL in the RO/NF membrane filtration systems concentrated water−1.The RO/NF films use property
The rolling or hollow-fiber module of antipollution material that can be excellent, can select suitable processing method, if necessary as needed
Relatively low production water concentration, production water can be transferred into one or more NF/RO film cascades components, until selenium is dirty in final production water concentration
The content for contaminating object is less, so as to be directly discharged in environment.If necessary to reduce the load volume in subsequent processing process,
NF/RO membrane modules can also use two sections or multistage arrangement, by one section of concentrated water by next section of NF/RO film process, reduce dense
Water volume improves the RO/NF membrane filtration systems production water rate of recovery.The selenium sedimentation basin production water is in incrustation ion cuts down pond by strong
Sour base exchange method effectively removes Ca remaining in selenium sedimentation basin production water2+, so as to suppress or eliminate subsequently to entering RO/NF membrane systems
System film surface scaling fouling；Or the selenium sedimentation basin production water is effectively inhibited in incrustation ion cuts down pond by adding antisludging agent
CaSO4Generation, so as to suppress or eliminate subsequently to entering RO/NF membranous system film surface scaling foulings, the antisludging agent is polypropylene
Acid, poly or maleic anhydride copolymer.
Embodiment 1
When water inlet includes 170 μ gL−1Se6+Or Se4+And 60mgL−1Sulfate selenium-containing wastewater, locate in advance by micro-filtration
Suspended solid and macromolecular substances in reason removal waste water etc., pretreated production water enter level-one one-part form NF membrane filtrations system
System, NF films water inlet operating pressure are 1.51MPa, and production water flow is 182Lh−1, the selenium concentration produced in water is only 16.8 μ gL−1, concentrated water flow is 89.6mgL−1, but have higher selenium concentration in concentrated water, the content of sulfate is less, concentrated water directly into
Enter selenium removal agitating reaction pond, Se content is effectively removed, while generation etc. is worked as by adding metallic iron generation iron/selenium reduction reaction
The iron of amount/selenium metal or ferrous iron/iron hydroxide/selenium（Typically selenite）Precipitation, Se content is apparent in sedimentation basin water outlet
It reduces, which is only 35.7 μ gL−1, isogenetic sludge is removed, and volume accounting is 60% supernatant in selenium sedimentation basin
It is combined with NF membrane filtrations production water, with reference to the μ gL of selenium concentration≤25 of water−1, meet further stringent environment protection standard emission request,
40% supernatant of remaininging enters incrustation ion abatement process and reduces its slightly soluble ion or calcium or multivalent ion, because high in supernatant
The deliquescent incrustation ion of concentration may make induction NF film surfaces that precipitation occur or otherwise pollute NF membrane filtration systems.
This part supernatant is handled, calcium remaining in removal water outlet can be exchanged by ion-exchange such as strong-acid cation or by adding
Add 5 μ gL−1Maleic anhydride copolymer antisludging agent, realize inhibit NF film surface scaling foulings purpose.
Embodiment 2
When water inlet includes 200 μ gL−1Se6+Or Se4+And 2000mgL−1Sulfate selenium-containing wastewater, it is pre- by micro-filtration
Suspended solid and macromolecular substances in processing removal waste water etc., pretreated production water enter level-one two-part RO membrane filtrations
System, RO films water inlet operating pressure are 1.84MPa, and production water flow is 168Lh−1, the selenium concentration produced in water is only 5.7 μ gL−1, concentrated water flow is 103mgL−1, but having higher selenium concentration in concentrated water, the content of sulfate is 4528mgL−1, so logical
It crosses addition milk of lime in the solution and adjusts its pH value between 8-10, calcium salt, magnesium salts, sulfate in initiation solution etc. is in sulfuric acid
Chemical coprecipitation reaction occurs in salt removal agitating reaction pond, is stood subsequently into sulfate precipitation pond, the crystal of generation is cotton-shaped
Object is deposited to bottom of pond, so as to reduce sulphates content extremely≤200 mgL in supernatant−1, small part sulfate sludge reflux
To sulfate removal agitating reaction pond as precipitation initiator, and supernatant then enters selenium and removes agitating reaction pond, using anaerobism
Biologic treating technique adds oxidant and selenite in water is completely converted into selenate first, oxidant is Fenton reagent,
Then perchloric acid or potassium bichromate carry out Anaerobic Treatment abatement Se content, the sludge in anaerobic reation pool is discharged from system, so as to
Reduce in supernatant Se content, the supernatant that volume accounting is 75% is combined with RO membrane filtrations production water, with reference to water selenium concentration≤
8.74 μg·L−1, meet further stringent environment protection standard emission request, it is impossible to more than the concentration of requirement.The supernatant of residue 25%
Into incrustation ion abatement process processing slightly soluble ion or calcium or multivalent ion, it is a kind of poly- by adding to handle this part supernatant
The antisludging agent chemicals of acrylic acid inhibits CaSO4The generation of crystal slows down RO film surface pollutions.
The basic principle of the utility model, main feature and advantage has been shown and described above, it is new not departing from this practicality
Under the premise of type spirit and scope, the utility model also has various changes and modifications, these changes and improvements both fall within requirement and protect
The scope of the utility model of shield.
Claims (2)
1. a kind of device of integrated membrane process hydridization removal low concentration selenium-containing wastewater, it is characterised in that including pretreatment intake pool, RO/
NF membrane filtration systems, standard discharge selenium-containing wastewater pond, sulfate removal agitating reaction pond, sulfate precipitation pond, selenium removal stirring
Reaction tank, selenium sedimentation basin and incrustation ion abatement pond, wherein pretreatment intake pool liquid outlet passes through pipeline and RO/NF membrane filtrations system
System inlet is connected, and RO/NF membrane filtration systems filtering production water liquid outlet passes through pipeline and standard discharge selenium-containing wastewater pond inlet
It is connected, RO/NF membrane filtration system concentrated waters liquid outlet removes agitating reaction pond inlet with sulfate by pipeline respectively and selenium is gone
Except agitating reaction pond inlet is connected, as sulfate concentration≤200mgL in RO/NF membrane filtration system concentrated waters−1When, RO/NF films
Filtration system concentrated water is connected with selenium removal agitating reaction pond, as sulfate concentration ＞ 200mg in RO/NF membrane filtration system concentrated waters
L−1When, RO/NF membrane filtration systems concentrated water is connected with sulfate removal agitating reaction pond, sulfate removal agitating reaction pond supernatant
Liquid outlet is connected by pipeline with sulfate precipitation pond inlet, and sulfate precipitation pond mud discharging mouth is removed by pipeline and sulfate
Agitating reaction pond is connected, and sulfate precipitation pond supernatant liquid outlet removes agitating reaction pond inlet with selenium by pipeline and is connected,
Selenium removal agitating reaction pond supernatant liquid outlet is connected by pipeline with selenium sedimentation basin, and selenium sedimentation basin supernatant liquid outlet passes through pipe
Road is connected respectively with standard discharge selenium-containing wastewater pond inlet and incrustation ion abatement pond inlet, and incrustation ion abatement pond goes out liquid
Mouth is connected by pipeline with RO/NF membrane filtration system inlets.
2. the device of integrated membrane process hydridization removal low concentration selenium-containing wastewater according to claim 1, it is characterised in that：It is described
RO/NF membrane filtration systems are using one or more NF/RO film cascades composition or using the i.e. one section of NF/ of two sections/multistage pattern of rows and columns
RO membrane filtration systems concentrated water passes through next section of NF/RO membrane filtration system.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107759024A (en) * | 2017-11-20 | 2018-03-06 | 河南师范大学 | A kind of integrated membrane process hydridization removes the method and device of low concentration selenium-containing wastewater |
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