CN104150651B - A kind of electronation assisted electrochemical method removes chromic method in water - Google Patents
A kind of electronation assisted electrochemical method removes chromic method in water Download PDFInfo
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Abstract
The invention provides a kind of electronation assisted electrochemical method and remove chromic method in water, described method comprise the steps: to pH value be 2～4 former water in add reducing agent and carry out chemical reduction reaction, make part Cr (VI) be reduced to Cr3+, it is electrochemically reacted subsequently into the electrochemical reactor that electrode material is ferrum, makes remaining Cr (VI) be reduced to Cr3+, the pH value of water raises simultaneously, Cr3+It is converted into Cr (OH)3, then by solid-liquid separation unit and sand filtration unit, it is achieved chromic removal in water.The technique of the present invention includes that chemical reduction method and electrochemical process remove chromium unit, then water outlet can reach wastewater discharge standard after solid-liquid separation.Present invention process system footprint is few, easily realizes equipment and Automated condtrol, and operating cost is cheap, is especially suitable for the online treatment of middle and small scale chromate waste water.
Description
Technical field
The invention belongs to field of waste water treatment, relate to a kind of electronation assisted electrochemical method and remove sexavalence in water
The method of chromium, utilizes Cr VI in chemical method assisted Reduction waste water particularly to one, uses electrochemical reduction
Chromic method in industrial wastewater is removed with flocculation.
Background technology
Chromate waste water is mainly derived from the industry such as plating, metallurgy, printing and dyeing and chromium salt production, at chromate waste water
In, main polluter is Cr (VI).In water, Cr (VI) toxicity is extremely strong, compares Cr3+Exceed 100 times, it is difficult to
Natural degradation, has lasting danger to environment.Cr (VI) is mainly chronic toxicity to human body, can pass through
Digestive tract, respiratory tract, skin and mucosa invade human body accumulated in creatures, are extremely strong carcinogenic of a kind of toxicity
Material.
The processing method of chromate waste water mainly includes chemical reduction method, ion exchange, absorption method, electrochemistry
Method and membrane separation process etc..Chemical reduction method is current most widely used chromium containing waste water treatment method, and it is basic
Principle is to add reducing agent in acid condition in waste water, Cr (VI) is reduced into Cr (III), adds
Enter Calx or sodium hydroxide so that it is generate Cr (OH) in the basic conditions3Precipitation, thus remove chromium ion,
Conventional reducing agent have Na2S2O5、Na2SO3、NaHSO3And FeSO4Deng.
Chemical equation is as follows:
2H2Cr2O7+3Na2S2O5+2H2SO4=2Cr2(SO4)3+3Na2SO4+5H2O
H2Cr2O7+3Na2SO3+3H2SO4=Cr2(SO4)3+3Na2SO4+4H2O
2H2Cr2O7+6NaHSO3+3H2SO4=2Cr2(SO4)3+3Na2SO4+8H2O
H2Cr2O7+6FeSO4+6H2SO4=Cr2(SO4)3+3Fe2(SO4)3+8H2O
It is low that chemical reduction method has operating cost, the advantage that treatment effect is stable；However it is necessary that consumption is big to quantify
Learn reagent, water outlet salinity is high, sludge yield is big and is easily generated SO2Deng secondary pollution.
Electrochemical process processing waste water containing chrome, is to utilize soluble iron anode, under DC electric field effect, and ferrum sun
The most constantly dissolve, produce Fe2+, make Cr in waste water (VI) be reduced into Cr (III) in acid condition, be electrolysed
Journey produces OH-, wastewater pH gradually rises, and Cr (III) forms Cr (OH)3, Fe simultaneously2+It is converted into Fe3+
And occur flocculation and negative electrode to produce hydrogen generation air supporting effect strengthening Cr (OH)3The removal of colloid.
Dominant response is:
Fe–2e-=Fe2+
Cr2O7 2-+6FeSO4+6H2SO4=Cr2(SO4)3+3Fe2(SO4)3+8H2O
Electrolysis produces Fe2+Yield formula: CFe=nItM*1000/ (z*F*v), I=D/s
Wherein, CFeRefer to the concentration of ferrum, mg/L；N refers to pole plate number；I refers to current intensity, A；M refers to ferrum
Molal weight, 56g/mol；Z refers to charge number, 2；F refers to Faraday constant, 96580c/mol；V refers to reaction
Device volume, L；D refers to electric current density, A/m2；S refers to polar plate area, m2。
Electrochemical process operation run simple, take up an area less, easily realize equipment and automatization, non-secondary pollution,
Need not outer adding medicine and sludge yield is few, an electrochemical reactor can realize reduction simultaneously, add
Alkali, flocculation, air supporting process.
Along with national energy-saving Mitigation options is increasingly strict, and cleaning is produced and resource is repeatable utilizes theory
Promotion, it is desirable to blowdown enterprise must realize the watershed management of waste water " thus bypasses ".As electroplating enterprise is needed
Realize electroplate trough rim waste water process, this require water treatment system must equipment, take up an area save, self controllable,
Flow process is short.Electrochemical process meets cleaning green, watershed management, idea of development requirement flexibly and fast, has
Good application prospect, is especially suitable for the process of middle and small scale chromate waste water.But, electrochemical process has place
The shortcoming that reason effect is unstable, power consumption is big, water treatment operating costs is higher.Additionally, the passivation of electrode and
Corrosion is to affect electrochemistry except the unfavorable factor of chromium system stable operation.Electrode passivation can cause voltage to raise,
Electrode corrosion can increase the weight of again electrode passivation, interrupt run must change electrode when electrode corrosion is serious.Research
Show, improve electric current density and can increase the weight of the passivation of electrode, and accelerating anode dissolves and consumes.Therefore, electrochemistry
Water treatment system is run than the most at lower current densities, thus reduces power consumption and extend pole plate use
Life-span.In electro-chemical water processing system running, usually also need to add electrolyte improve the conductance of water
Rate, thus reduce voltage and power consumption.Electrochemical process is except the shortcoming of chromium technology, and the restrictive condition shadow of application
Ring it to promote.
Summary of the invention
To this end, an object of the present invention is to utilize chemical reduction method and electrochemical process to remove Cr VI in water
Complementarity, chemical reduction method and electrochemical process are organically combined, propose to use electronation assisted electrochemical
Method removes Cr VI in water: using electronation as preprocessing means, it is ensured that whole technique except chromium effect,
Reduce power consumption, reduce water treatment operating costs, using electrochemical process as core cell, reduce medicament and use
Amount, minimizing secondary pollution and sludge yield.Described method integrated artistic unit is compact, easily realize equipmentization and
Automated condtrol, is especially suitable for the online treatment of middle and small scale chromate waste water.
In order to achieve the above object, present invention employs following technical scheme:
A kind of electronation assisted electrochemical method removes chromic method in water, and described method includes walking as follows
Rapid:
It is the former water of 2～4 to add reducing agent carry out chemical reduction reaction to pH value, makes part Cr (VI) reduce
For Cr3+, it is electrochemically reacted subsequently in the electrochemical reactor that electrode material is ferrum, makes remaining
Cr (VI) is reduced to Cr3+, the pH value of water raises simultaneously, Cr3+It is converted into Cr (OH)3, then divided by solid-liquid
From unit and sand filtration unit, it is achieved chromic removal in water.
Chemical reduction method is removed the pretreatment unit of Cr (VI) in water as electrochemical process by the present invention, by adding
Enter a certain amount of Cr (VI) in a certain amount of reducing agent reductive water, and improve electrolyte content in water, reduce follow-up electricity
The load of electronation chromium and power consumption, extend electrode life, reduces electrochemical process and removes chromium operating cost,
Strengthen electrochemical process except chromium system stable water outlet.Using electrochemical process as except the core cell of chromium, can drop
Low chemical reduction method medicament usage amount, reduces secondary pollution, the Fe that anodic solution produces2+By remaining in water
Cr (VI) is reduced to Cr (III), and produces Fe3+Flocculation, hydrogen air supporting and electrochemistry add alkali effect, finally lead to
Later the Cr (OH) that continuous solid-liquid separation is converted into3Colloid is separated from the water out, then through sand filtration,
Realize the purification to Cr in water (VI) eventually to remove, make water outlet reach wastewater discharge standard.
In the present invention, when described former water pH value is more than 4, the pH value of former water need to be regulated so that it is be 2～4,
Such as 2.1,2.2,2.3,2.4,2.5,2.6,2.7,2.8,2.9,3,3.1,3.2,3.3,3.4,
3.5,3.6,3.7,3.8 or 3.9, specifically can be realized by acid adding, such as, can regulate former water by adding sulphuric acid
PH value be 2～4.When former water pH value is 2～4, Cr in processed rear water6+Respectively can be low with total chromium concn
In 0.1mg/L and 0.5mg/L.
In the present invention, regulating former water pH value is 2～4, and reduction reaction efficiency can be made the highest.
In the present invention, described reducing agent can use Na2S2O5、Na2SO3、NaHSO3Or FeSO4In
Any one or the mixture of at least two.
Reducing agent can be added to the water by pipe-line mixer.
In the present invention, described chemical reduction reaction is carried out in heterophase reactor, fills in heterophase reactor
Polyhedron empty ball, polyhedron empty ball a diameter of 30～60mm.
In the present invention, the time of chemical reduction reaction is 5～20min, such as 6min, 7min, 8min,
9min、10min、11min、12min、13min、14min、15min、16min、17min、18min
Or 19min.
In the present invention, Cr in described electronation assisted electrochemical reductive water6+Method in, in former water
Cr6+The relation of one of initial concentration, reducing agent dosage and electrochemical reaction condition electric current density can be expressed
For:
CCr(VI)=CrElectronation+CrElectroreduction=CReducing agent/MReducing agent×SR×MCr+CFe/MFe/3×MCr
Wherein, CCr(VI)Refer to the Cr being reduced6+Amount, mg/L；CReducing agentRefer to chemical reducing agent dense added
Degree, mg/L；MReducing agentRefer to the molal weight of chemical reducing agent, g/mol；SR is Cr6+Chemistry with reducing agent
The quantitative relation of reduction reaction, wherein, Cr6+With Na2S2O5、Na2SO3、NaHSO3And FeSO4Chemistry
Stoichiometric mole ratio is 4/3,2/3,2/3 and 1/3 respectively；MCrRefer to the molal weight of chromium, 52g/mol；CFeRefer to
The concentration of ferrum, mg/L；MFeRefer to the molal weight of ferrum, 56g/mol.
According to this formula, it is known that former water Cr6+Concentration, chemical reaction meterological relation and electronation Duan Yu electricity
The duty ratio of chemistry section reduction of hexavalent chromium, can be calculated reducing agent dosage and electric current density.
Preferably, described electric current density is 2～50A/m2, such as 5A/m2、8A/m2、13A/m2、16
A/m2、19A/m2、22A/m2、25A/m2、28A/m2、31A/m2、34A/m2、37A/m2、40
A/m2、43A/m2、46A/m2Or 49A/m2。
Preferably, one of electrochemical reaction condition hydraulic detention time is 5～60min, such as 9min, 13
min、17min、21min、25min、29min、33min、37min、41min、45min、49
Min, 53min, 57min or 59min.
Electrochemistry can process requirement according to water except chromium unit, and Design and Machining is corresponding scale electrochemical reactor,
Electrode material is ferrum, produces Cr VI, simultaneously ferrous iron in ferrous iron reductive water in electrochemical reaction process
It is converted into ferric iron generation flocculation.
Described solid-liquid separation unit can be sedimentation tank, centrifugal filtration, ultrafiltration or micro-filtration membrane separative element.
The pH value entering this solid-liquid separation unit water is 6～8.5, such as 6.1,6.2,6.3,6.4,6.5,
6.6、6.7、6.8、6.9、7、7.1、7.2、7.3、7.4、7.5、7.6、7.7、7.8、7.9、8、
8.1,8.2,8.3 or 8.4, if the pH value of water is less than 6, then needs to add alkali and regulate its pH value so that it is for
6～8.5, such as can add a certain amount of NaOH and be adjusted.
In described sand filtration unit, filtrate is 0.1～5.0mm particle diameter quartz sand.
Exemplary a kind of employing electronation assisted electrochemical method removes chromic method in water, described side
Method comprises the steps:
It is the former water of 2～4 to add reducing agent carry out chemical reduction reaction, chemical reduction reaction time to pH value
It is 5～20min, makes part Cr (VI) be reduced to Cr3+, carry out electrochemistry subsequently into electrochemical reactor anti-
Should, it is 2～50A/m in electric current density2Under the conditions of the electrochemical reaction that hydraulic detention time is 5～60min,
Remaining Cr (VI) in water is made to be reduced to Cr3+, the pH value of water raises simultaneously, Cr3+It is converted into Cr (OH)3,
Then by solid-liquid separation unit and sand filtration unit, it is achieved chromic removal in water.
In the present invention, exemplary electronation assisted electrochemical method removes the tool of chromic method in water
Body technology flow process is as shown in Figure 1.
The two of the purpose of the present invention are to provide a kind of electronation assisted electrochemical method to remove in water chromic
Method, described method comprises the steps:
It is the former water of 2～4 to add reducing agent carry out chemical reduction reaction to pH value, makes Cr (VI) be reduced to
Cr3+, it is electrochemically reacted subsequently in the electrochemical reactor that electrode material is aluminum, simultaneously the pH of water
Value raises, Cr3+It is converted into Cr (OH)3, then by solid-liquid separation unit and sand filtration unit, it is achieved in water six
The removal of valency chromium.
Chemical reduction method is removed Cr (VI) reduction unit of Cr (VI) in water as electrochemical process by the present invention, logical
Cross whole Cr (VI) in addition reducing agent reductive water, and improve electrolyte content in water, extend electrode and use the longevity
Life, reduces electrochemical process and removes chromium operating cost, strengthens electrochemical process except chromium system stable water outlet.By electrification
As except the post-processing unit of chromium, there is following electrochemical reaction in method:
Al-3e-=Al3+
2H2O+2e=H2+2OH-
In this electrochemical reactor, produce Al3+Flocculation, hydrogen air supporting and electrochemistry add alkali effect,
The Cr (OH) being converted into by follow-up solid-liquid separation eventually3Colloid is separated from the water out, then through sand
Filter, the purification of Cr in water (VI) is removed, is made water outlet reach wastewater discharge standard by final realization.In the method
In, the effect of electrochemical reactor is to produce Al3+Flocculation, hydrogen air supporting and electrochemistry add alkali effect,
Generate Cr (OH)3Colloid, it is achieved the separation of follow-up solid-liquid separation.
In the present invention, when described former water pH value is more than 4, the pH value of former water need to be regulated so that it is be 2～4,
Such as 2.1,2.2,2.3,2.4,2.5,2.6,2.7,2.8,2.9,3,3.1,3.2,3.3,3.4,
3.5,3.6,3.7,3.8 or 3.9, specifically can be realized by acid adding, such as, can regulate former water by adding sulphuric acid
PH value be 2～4.When former water pH value is 2～4, Cr in processed rear water6+Respectively can be low with total chromium concn
In 0.1mg/L and 0.5mg/L.
In the present invention, described reducing agent can use Na2S2O5、Na2SO3、NaHSO3Or FeSO4In
Any one or the mixture of at least two.
Reducing agent can be added to the water by pipe-line mixer.
In the present invention, described chemical reduction reaction is carried out in heterophase reactor, fills in heterophase reactor
Polyhedron empty ball, polyhedron empty ball a diameter of 30～60mm.
In the present invention, the time of chemical reduction reaction is 5～30min, such as 8min, 11min,
14min, 17min, 20min, 23min, 26min or 29min.
Described solid-liquid separation unit can be sedimentation tank, centrifugal filtration, ultrafiltration or micro-filtration membrane separative element.
The pH value entering this solid-liquid separation unit water is 6～8.5, such as 6.1,6.2,6.3,6.4,6.5,
6.6、6.7、6.8、6.9、7、7.1、7.2、7.3、7.4、7.5、7.6、7.7、7.8、7.9、8、
8.1,8.2,8.3 or 8.4, if the pH value of water is less than 6, then needs to add alkali and regulate its pH value so that it is for
6～8.5, such as can add a certain amount of NaOH and be adjusted.
In described sand filtration unit, filtrate is 0.1～5.0mm particle diameter quartz sand.
Exemplary a kind of electronation assisted electrochemical method removes chromic method in water, described method bag
Include following steps:
It is the former water of 2～4 to add reducing agent carry out chemical reduction reaction, chemical reduction reaction time to pH value
It is 5～30min, makes Cr (VI) be reduced to Cr3+, enter subsequently into the electrochemical reactor that electrode material is aluminum
Row electrochemical reaction, the pH value of water raises simultaneously, Cr3+It is converted into Cr (OH)3, then pass through solid-liquid separation
Unit and sand filtration unit, it is achieved chromic removal in water.
Compared with the prior art, there is advantages that
(1) present invention is using chemical reduction method as pretreatment unit, reduces subsequent electrochemical reduction Cr (VI)
Load and power consumption, extend electrode life, reduces electrochemical process and removes chromium operating cost, enhances electricity
Chemical method removes chromium system stable water outlet, using electrochemical process as except the core cell of Cr (VI), can reduce
Chemical reduction method medicament usage amount, reduces secondary pollution, and sludge yield is low.
(2) the method for the invention can realize scale 0.1～1000m3/ h, former water Cr (VI) initial concentration are
The removal of the former water chromium ion of 0～1000mg/L, wherein, owing to former water pH value is 2～4, processed rear water
Middle Cr6+0.1mg/L and 0.5mg/L can be less than respectively with total chromium concn；
(3) this process system takes up an area few, easily realizes equipment and Automated condtrol, is especially suitable for middle and small scale
The online treatment of chromate waste water.
(4) operating cost is cheap, and convenient operation and management.
Accompanying drawing explanation
Fig. 1 is that one electronation assisted electrochemical of the present invention removes chromic process chart in water.
Figure of description labelling is as follows:
1. water inlet 2. acid-adding port 3. tubular static mixer 4. reducing agent dosing mouth more than 5. is contrary
Device 6. electrochemical reactor 7. is answered to add alkali mouth 8. equipment for separating liquid from solid 9. sand filtering device 10. row
Put mouth.
Detailed description of the invention
Further illustrate technical scheme below in conjunction with the accompanying drawings and by detailed description of the invention.
Embodiment 1
In former water Cr (VI) concentration be 100mg/L, pH value be 3, use Na2S2O5As reducing agent, water
Treatment scale 10m3/h。Na2S2O5Throwing amount is 85mg/L, and electrochemical reactor cumulative volume is 7.5m3, electricity
Pole material is ferrum, and the electrochemical treatments time is 45min, and electrochemical reactor internal polar plate quantity is 100 pieces
(0.8m × 0.6m × 0.005m), electric current density is 30A/m2。
Water outlet Cr (VI) concentration is less than 0.03mg/L after treatment, and total Cr concentration is less than 0.1mg/L.
Embodiment 2
In former water, Cr (VI) concentration is 350mg/L, and pH value is 2.5, uses Na2S2O5As reducing agent,
Water treatment scale 60m3/h。Na2S2O5Throwing amount is 300mg/L, electrochemical reactor cumulative volume 60.0m3,
Electrode material is ferrum, and the electrochemical treatments time is 60min, and electrochemical reactor internal polar plate quantity is 750 pieces
(1.0m × 0.6m × 0.005m), electric current density is 25A/m2。
Water outlet Cr (VI) concentration is less than 0.05mg/L after treatment, and total Cr concentration is less than 0.08mg/L.
Embodiment 3
In former water Cr (VI) concentration be 500mg/L, pH value be 5, use sodium sulfite as reducing agent, water
Treatment scale 50m3/h.Adding a certain amount of sulphuric acid and sewage pH is adjusted to 2.5～3.0, sodium sulfite throwing amount is
545mg/L, electrochemical reactor cumulative volume is 67.0m3, electrode material is ferrum, and the process time is 80
Min, electrochemical reactor internal polar plate quantity is 810 pieces (0.7m × 0.6m × 0.005m), and electric current density is
35A/m2。
Water outlet Cr (VI) concentration is less than 0.02mg/L after treatment, and total Cr concentration is less than 0.05mg/L.
Embodiment 4
In former water Cr (VI) concentration be 200mg/L, pH value be 8, use sodium sulfite as reducing agent, water
Treatment scale 120m3/h.Adding a certain amount of sulphuric acid and sewage pH is adjusted to 2.5～3.0, sodium sulfite throwing amount is
320mg/L, electrochemical reactor cumulative volume is 130.0m3, electrode material is ferrum, and the process time is 65
Min, electrochemical reactor internal polar plate quantity is 1100 pieces (1.2m × 0.5m × 0.005m), electric current density
For 55A/m2。
Water outlet Cr (VI) concentration is less than 0.04mg/L after treatment, and total Cr concentration is less than 0.07mg/L.
Embodiment 5
In former water Cr (VI) concentration be 100mg/L, pH value 2.8, use ferrous sulfate as reducing agent, water
Treatment scale 300m3/h.Ferrous sulfate throwing amount is 280mg/L, electrochemical reactor volume 50.0m3, electricity
Pole material is ferrum, and the process time is 10min, electrochemical reactor internal polar plate quantity be 500 pieces (0.8m ×
0.5m × 0.005m), electric current density is 40A/m2。
Water outlet Cr (VI) concentration is less than 0.02mg/L after treatment, and total Cr concentration is less than 0.05mg/L.
Embodiment 6
In former water Cr (VI) concentration be 600mg/L, pH value 5.5, use ferrous sulfate as reducing agent, water
Treatment scale 500m3/h.Adding a certain amount of sulphuric acid and sewage pH is adjusted to 2.5～3.0, ferrous sulfate throwing amount is
1600mg/L, electrochemical reactor volume 83.0m3, electrode material is ferrum, and the process time is 10min, electricity
Chemical reactor internal polar plate quantity is 900 pieces (0.7m × 0.5m × 0.005m), and electric current density is 18A/m2。
Water outlet Cr (VI) concentration is less than 0.03mg/L after treatment, and total Cr concentration is less than 0.1mg/L.
Embodiment 7
In former water Cr (VI) concentration be 1000mg/L, pH value 5.5, use Na2S2O5As reducing agent, water
Treatment scale 1000m3/h.Add a certain amount of sulphuric acid and sewage pH is adjusted to 2.0～2.5, Na2S2O5Throwing amount
For 2800mg/L, the control chemical reduction reaction time is 20min.Electrochemical reactor volume 83.0m3, electricity
Pole material is ferrum, and the process time is 60min, electrochemical reactor internal polar plate quantity be 900 pieces (0.7m ×
0.5m × 0.005m), electric current density is 50A/m2。
Water outlet Cr (VI) concentration is less than 0.03mg/L after treatment, and total Cr concentration is less than 0.1mg/L.
Embodiment 8
In former water Cr (VI) concentration be 50mg/L, pH value be 6, use Na2S2O5As reducing agent, at water
Reason scale 10m3/h.Add a certain amount of sulphuric acid and sewage pH is adjusted to 3.5～4.0, Na2S2O5Throwing amount is 85
Mg/L, the control chemical reduction reaction time is 15min.Electrochemical reactor cumulative volume is 7.5m3, electrode
Material is ferrum, and the electrochemical treatments time is 15min, and electrochemical reactor internal polar plate quantity is 100 pieces of (0.8m
× 0.6m × 0.005m), electric current density is 2A/m2。
Water outlet Cr (VI) concentration is less than 0.03mg/L after treatment, and total Cr concentration is less than 0.1mg/L.
Embodiment 9
In former water Cr (VI) concentration be 50mg/L, pH value be 6, use Na2S2O5As reducing agent, at water
Reason scale 10m3/h.Add a certain amount of sulphuric acid and sewage pH is adjusted to 3.5～4.0, Na2S2O5Throwing amount is 220
Mg/L, the control chemical reduction reaction time is 5min.Electrochemical reactor cumulative volume is 7.5m3, electrode material
Material is aluminum, and electrochemical reactor internal polar plate quantity is 100 pieces (0.8m × 0.6m × 0.005m).
Water outlet Cr (VI) concentration is less than 0.03mg/L after treatment, and total Cr concentration is less than 0.1mg/L.
Embodiment 10
In former water Cr (VI) concentration be 200mg/L, pH value be 6, use Na2S2O5As reducing agent, water
Treatment scale 10m3/h.Add a certain amount of sulphuric acid and sewage pH is adjusted to 2.5～3.0, Na2S2O5Throwing amount is
900mg/L, the control chemical reduction reaction time is 30min.Electrochemical reactor cumulative volume is 7.5m3, electricity
Pole material is aluminum, and electrochemical reactor internal polar plate quantity is 100 pieces (0.8m × 0.6m × 0.005m).
Water outlet Cr (VI) concentration is less than 0.03mg/L after treatment, and total Cr concentration is less than 0.1mg/L.
Applicant states, the present invention illustrates the method detailed of the present invention by above-described embodiment, but the present invention
It is not limited to above-mentioned method detailed, does not i.e. mean that the present invention has to rely on above-mentioned method detailed ability real
Execute.Person of ordinary skill in the field is it will be clearly understood that any improvement in the present invention, to product of the present invention
The equivalence of each raw material is replaced and the interpolation of auxiliary element, concrete way choice etc., all falls within the guarantor of the present invention
Within the scope of protecting scope and disclosure.
Claims (4)
1. electronation assisted electrochemical method removes a chromic method in water, described method include as
Lower step:
It is the former water of 2～4 to add reducing agent carry out chemical reduction reaction to pH value, makes part Cr (VI) also
Originally it was Cr3+, it is electrochemically reacted subsequently in the electrochemical reactor that electrode material is ferrum, makes residue
Cr (VI) be reduced to Cr3+, the pH value of water raises simultaneously, Cr3+It is converted into Cr (OH)3, then by solid
Liquid separative element and sand filtration unit, it is achieved chromic removal in water；
Wherein, described reducing agent is selected from Na2S2O5、Na2SO3、NaHSO3Or FeSO4Any one of
Or the mixture of at least two, the time of chemical reduction reaction is 5～20min, the waterpower of electrochemical reaction
The time of staying is 5～60min, and the pH value entering solid-liquid separation unit water is 6～8.5；
Described chemical reduction reaction is carried out in heterophase reactor, fills polyhedron empty ball in heterophase reactor,
Polyhedron empty ball a diameter of 30～60mm；The electric current density of electrochemical reaction is 2～50A/m2, sand filtration unit
Middle filtrate is 0.1～5.0mm particle diameter quartz sand.
2. the method for claim 1, it is characterised in that solid-liquid separation unit be sedimentation tank, from
Heart filtration, ultrafiltration or micro-filtration membrane separative element.
3. electronation assisted electrochemical method removes a chromic method in water, described method include as
Lower step:
It is the former water of 2～4 to add reducing agent carry out chemical reduction reaction to pH value, makes Cr (VI) be reduced to
Cr3+, it is electrochemically reacted subsequently in the electrochemical reactor that electrode material is aluminum, simultaneously the pH of water
Value raises, Cr3+It is converted into Cr (OH)3, then by solid-liquid separation unit and sand filtration unit, it is achieved in water
Chromic removal；
Wherein, described reducing agent is selected from Na2S2O5、Na2SO3、NaHSO3Or FeSO4Any one of
Or the mixture of at least two, the time of chemical reduction reaction is 5～30min, enters solid-liquid separation unit
The pH value of water is 6～8.5；Described chemical reduction reaction is carried out in heterophase reactor, fills out in heterophase reactor
Filling polyhedron empty ball, polyhedron empty ball a diameter of 30～60mm, in sand filtration unit, filtrate is 0.1～5.0mm
Particle diameter quartz sand.
4. method as claimed in claim 3, it is characterised in that solid-liquid separation unit be sedimentation tank, from
Heart filtration, ultrafiltration or micro-filtration membrane separative element.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410404014.XA CN104150651B (en) | 2014-08-15 | 2014-08-15 | A kind of electronation assisted electrochemical method removes chromic method in water |
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| CN201410404014.XA CN104150651B (en) | 2014-08-15 | 2014-08-15 | A kind of electronation assisted electrochemical method removes chromic method in water |
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| Publication Number | Publication Date |
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| CN105858991A (en) * | 2016-03-08 | 2016-08-17 | 侯绪华 | Chrome-containing wastewater treatment device |
| CN109133443A (en) * | 2018-09-27 | 2019-01-04 | 长江师范学院 | The minimizing technology of high valence chrome in a kind of waste water |
| CN115196798B (en) * | 2022-06-15 | 2023-10-20 | 山东大学 | Method for promoting quick flocculation of chromium in water |
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| CN86106414A (en) * | 1986-11-07 | 1988-05-04 | 冶金工业部钢铁研究总院 | Electrolytic method for treating wastewater containing vanadium and chromium |
| CN1059706A (en) * | 1990-09-10 | 1992-03-25 | 张庆华 | Electrochemical process is removed chromic technology and equipment in the Drinking Water |
| CN101549925A (en) * | 2008-03-31 | 2009-10-07 | 吴秋波 | Method for electrolyzing and recovering hexavalent chrome in chromium-electroplating waste water |
| CN102887559A (en) * | 2011-07-21 | 2013-01-23 | 中国科学院生态环境研究中心 | Electrochemical reduction assistance-based biosorption integrated reactor and treatment method of hexavalent chromium-containing wastewater |
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| CN86106414A (en) * | 1986-11-07 | 1988-05-04 | 冶金工业部钢铁研究总院 | Electrolytic method for treating wastewater containing vanadium and chromium |
| CN1059706A (en) * | 1990-09-10 | 1992-03-25 | 张庆华 | Electrochemical process is removed chromic technology and equipment in the Drinking Water |
| CN101549925A (en) * | 2008-03-31 | 2009-10-07 | 吴秋波 | Method for electrolyzing and recovering hexavalent chrome in chromium-electroplating waste water |
| CN102887559A (en) * | 2011-07-21 | 2013-01-23 | 中国科学院生态环境研究中心 | Electrochemical reduction assistance-based biosorption integrated reactor and treatment method of hexavalent chromium-containing wastewater |
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