CN105883982A - Device and method for recycling nitrogen and phosphorus of wastewater - Google Patents
Device and method for recycling nitrogen and phosphorus of wastewater Download PDFInfo
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- CN105883982A CN105883982A CN201610259921.9A CN201610259921A CN105883982A CN 105883982 A CN105883982 A CN 105883982A CN 201610259921 A CN201610259921 A CN 201610259921A CN 105883982 A CN105883982 A CN 105883982A
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- ammonia
- waste water
- nitrogen
- anode chamber
- aeration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/4618—Devices therefor; Their operating or servicing for producing "ionised" acidic or basic water
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
Abstract
The invention discloses a device and method for recycling the nitrogen and phosphorus of wastewater. The device mainly comprises a double-chamber reactor, a proton-exchange membrane, an aeration pipe, an aeration pump, a constant-current power supply, an electrode plate with an anode containing magnesium, an electrode plate with an inertia cathode, a stirrer, a pH meter, a computer, a draining pump, an ammonia stripping tank, an ammonia absorption device, an ammonia-nitrogen online testing device, a sealing gasket, a clamping device and a draining pipe. The method using the device to recycle the nitrogen and phosphorus of the wastewater is characterized in that the electrochemical reaction of the anode containing magnesium is utilized to provide the magnesium source and pH condition needed by the crystallization of anode chamber magnesium ammonium phosphate, the proton-exchange membrane is also used to prevent cathode chamber pH rising from interfering the crystallization process of the anode chamber magnesium ammonium phosphate, the ammonia stripping tank and the ammonia absorption device sufficiently utilize the high pH alkaline condition of the water in the anode chamber and the cathode chamber after the electrochemical reaction to recycle the residual ammonia and nitrogen of the wastewater, and the recycling efficiency of the high-nitrogen-phosphorus-ratio wastewater (the mole ratio of NH4<+>-N to PO4<3>-P is larger than 1:1) is maximized.
Description
Technical field
The present invention relates to a kind of device and method processed for waste water, particularly relate to a kind of for
Reclaim the apparatus and method of waste water nitrogen phosphorus, combine two kinds of wastewater electrochemical precipitation and ammonia aeration
Technique, belongs to waste water chemical processing fields.
Background technology
Nitrogen phosphorus is common contaminant in waste water, is also the direct inducement of body eutrophication, waste water
Denitrogenation dephosphorizing is needed to process before discharge.But, nitrogen phosphorus is plant growing desired nutritional element,
And phosphate rock resource the most day by day lacks, reclaim waste water nitrogen phosphorus water pollution control,
The aspects such as resource circulation utilization have important practical significance.The side of waste water recovery of nitrogen and phosphorus at present
Method, based on chemical method, is broadly divided into according to function: (1) individually reclaims nitrogen or the method for phosphorus,
The method absorbed such as ammonia aeration and absorbing liquid reclaims ammonia nitrogen in waste water, adds calcium salt or iron salt passes through phosphorus
The acid crystalline deposit such as calcium, iron phosphate reclaims phosphorus in waste water；(2) method simultaneously reclaiming nitrogen phosphorus, as
Add magnesium salt, promote that waste water ammonium root, phosphate radical and magnesium ion form ammoniomagnesium phosphate crystal precipitation
Method.For the function of pollutant removal and nitrogen reclamation of phosphorus resource, ammoniomagnesium phosphate crystal precipitates
Method can reclaim nitrogen P elements simultaneously, has more advantage.It addition, ammoniomagnesium phosphate crystal precipitation, can
To make slow release fertilizer use, value is higher.
At present, the method for waste water ammoniomagnesium phosphate crystalline deposit is typically by adding magnesium chloride etc. containing magnesium
Compound, i.e. magnesium salt, use interpolation alkaline solution such as sodium hydroxide solution or aeration to blow simultaneously
The carbon dioxide mode lifting waste water pH dissolved in de-waste water, promotes waste water ammonium radical ion, phosphorus
Acid ion is combined formation ammoniomagnesium phosphate crystal precipitation with magnesium ion.The problem of this method is main
Have: (1) adds magnesium salt solution, alkaline solution not only increases wastewater volume, and in waste water
Introduce chloride ion, the sodium ion etc. originally not having, cause new secondary pollution；(2) aeration blows
The carbon dioxide dissolved in de-waste water is often higher, in wastewater pH because of wastewater pH buffer capacity
The amplitude of liter is inconspicuous；(3) for nitrogen phosphorus mol ratio more than ammoniomagnesium phosphate crystal structure crystalline substance ammonia phosphonium ion
The waste water of mol ratio 1:1, such as piggery wastewater, after ammoniomagnesium phosphate crystal processes, ammonia nitrogen in waste water
(NH4 +-N) there is residue also to need subsequent cell to process.
Electrochemical process processes waste water, and to avoid directly the adding of chemical substance, response speed fast, and
And electric field action and air supporting effect enhance waste water mixing efficiency, development prospect is wide.At present,
Electrochemical process is typically to sacrifice aluminum, iron anode recovery phosphorus in waste water, about utilizing electrochemical process
The document simultaneously reclaiming nitrogen phosphorus rarely has report.
Summary of the invention
It is an object of the invention to for the deficiencies in the prior art, it is provided that one is used for reclaiming waste water nitrogen
The apparatus and method of phosphorus, to overcome tradition directly to reclaim waste water nitrogen by sacrificial magnesium anode electrochemical process
During phosphorus, cathode chamber pH rise interference anode chamber phosphate anion, magnesium ion and ammonium root from
Son combines and forms ammoniomagnesium phosphate crystal；Sacrificial magnesium anode electrolysis nitrogen phosphorus mol ratio
(NH4 +-N:PO4 3--P) > 1:1 waste water forms ammonia nitrogen after ammoniomagnesium phosphate crystal remaining problem.
The inventive system comprises two-compartment reactor, PEM, aeration tube, aeration pump,
Constant current source, containing magnesium electrode plate, inert electrode plate, blender, pH meter, computer, row
Water pump, ammonia aeration pond, ammonia absorption plant, ammonia nitrogen online testing device, seal washer, clamping
Device, slot, water inlet, outlet and drain pipe.
Anode chamber and cathode chamber that two-compartment reactor is affixed by sidewall are constituted, the contact sidewall of the two
Wall size is identical, and middle part has slot, is clamped by clamping device between this contact sidewall
PEM, PEM both sides arrange sealing gasket with anode chamber and cathode chamber contact position
Circle, thus anode chamber is separated with the water body in cathode chamber, prevent room, the two poles of the earth water body from revealing.Sun
Room, pole and cathode chamber all have the waste water in outlet and water inlet, cathode chamber and anode chamber can be through
Cross outlet, drain pipe and draining pump and enter ammonia aeration pond；The stirring paddle of blender is immersed in sun
In the water body of room, pole, pH meter probe is immersed in anode chamber's water body, and the plate containing magnesium electrode is placed in sun
In the water body of room, pole, being connected with the positive pole of constant current source as positive plate, the moon put into by inert electrode plate
In the water body of room, pole, it is connected as minus plate with the negative pole of constant current source；Aeration tube one end connects exposure
Air pump, the other end leads in ammonia aeration pond；Ammonia aeration pond is equipped with ammonia nitrogen online testing device,
The ammonia-containing gas that stripping goes out is passed through ammonia absorption plant, computer and aeration pump, constant current source, stirs
Mix machine, pH meter, draining pump, ammonia nitrogen online testing device are respectively connected with.
In technique scheme, it is to pass through that described clamping device clamps the mode of PEM
Flange bolt, or the U-shaped folder of flange clamps anode chamber's sidewall and this side seal packing ring, matter successively
Proton exchange, another seal washer and cathode chamber sidewall.
It is corresponding that each length of side of described slot is that anode chamber contacts sidewall wall with cathode chamber
0.65～0.85 times of the length of side.
The outer ring length of side of described seal washer is that anode chamber contacts sidewall wall pair with cathode chamber
Answer the length of side 1～1.2 times, the inner ring length of side of seal washer is that anode chamber contacts sidewall with cathode chamber
On wall 1～1.2 times of the slot correspondence length of side.
Described PEM is rectangle, and its length of side is the seal washer inner ring correspondence length of side
1.1～1.2 times.
Described containing magnesium mass percent in magnesium electrode plate reach 95% and more than.
The method utilizing said apparatus to carry out waste water recovery of nitrogen and phosphorus is: waste water to be processed will be needed defeated
Enter in anode chamber and cathode chamber, keep indoor, negative and positive the two poles of the earth liquid level concordant, adjust minus plate and sun
Die opening between pole plate to setting value, is opened blender and is made the water mixing in anode chamber uniform,
Open constant current source, start electrolysis.PH meter is monitored in anode chamber water body pH in real time and feeds back
To computer, when the numerical value of pH meter monitoring reaches setting value or the response time reaches setting value
Time, computer controls to cut out constant current source and blender, opening water discharge pump, and waste water enters ammonia and blows
De-pond, opens aeration pump, aeration in ammonia aeration pond, the ammonia-containing gas that ammonia aeration pond stripping goes out
Discharge after being passed through ammonia absorption plant, waste water in ammonia nitrogen online testing device real-time testing ammonia aeration pond
Ammonia nitrogen concentration also feeds back to computer, when ammonia nitrogen concentration amplitude of variation is less than 10% or when reacting
Between when reaching setting value, computer controls to cut out aeration pump, in waste water crystalline deposit reclaim, ammonia
After the emptying of stripping pond, two-compartment reactor is intake again.Open blender and constant current source, repeat
Above-mentioned subsequent step carries out the waste water recovery of nitrogen and phosphorus of a new round, absorbs full according to ammonia absorption plant ammonia
And situation, periodic replacement ammonia absorbent or absorbing liquid.
In such scheme, during described electrolysis, current density range is at 14.3A/m2～142.9
A/m2Between；Described battery lead plate die opening is 3～6cm.
Beneficial effects of the present invention is as follows:
1. anode made by the plate Han magnesium electrode, and negative electrode made by inert electrode plate, by electrolysis with ammoniomagnesium phosphate
Form reclaims waste water nitrogen phosphorus, and there is OH at negative and positive the two poles of the earth-Producing, near negative electrode and anode, liquid has stream
Dynamic exchange, in reactant liquor, pH rises very fast, and when pH is more than 10, anode chamber ultimately forms phosphorus
Acid magnesium crystalline deposit rather than ammoniomagnesium phosphate crystal precipitation.Present invention employs PEM
Water body exchange near isolation anode and negative electrode, i.e. forms anode and negative electrode two Room, PEM
Hinder cathode chamber OH-Move to anode chamber, overcome cathode chamber pH to rise anode chamber's ammonium phosphate
The interference of magnesium crystallization process, beneficially anode chamber pH controls, and then improves anode chamber's precipitate
Middle ammoniomagnesium phosphate crystal thing purity.Meanwhile, follow-up readjustment two-compartment reactor electrolysis can be saved process
Cost needed for water outlet high ph-values.
2. the present invention uses the group technology of sacrificial magnesium anode electrochemical method and ammonia aeration, utilizes
Magnesium anode cell reaction and electrolysate and the reaction of water, produce magnesium ion and OH-, promote sun
Extremely indoor phosphate radical, magnesium ion and ammonium radical ion move towards crystallochemical reaction direction, occur
Ammoniomagnesium phosphate crystal precipitation.Simultaneously as sacrificial magnesium anode electrochemical reaction water body
PH value has lifting, and in water, ammonia nitrogen mainly exists with free ammonia form, reclaims for follow-up ammonia aeration
Ammonia nitrogen provides condition.
3. the present invention provides sacrificial magnesium anode electrochemistry and ammonia aeration group technology can be by waste water
In nutrient substance be converted into the chemical products of the additional output value, as ammoniomagnesium phosphate (sacrifices magnesium sun
The chemicals that pole is reclaimed), the nitrogenous product that ammonia absorption plant produces, thus compensation device is run
Expense, beneficially package unit operating cost control.
Accompanying drawing explanation
Fig. 1 is the structural representation for reclaiming waste water nitrogen phosphorus device that the present invention provides；
Fig. 2 is clamping device, seal washer and PEM partial enlarged drawing.
Wherein: 1-two-compartment reactor；2-PEM；3-aeration tube；4-aeration pump；5-
Constant current source；6-anode plate Han magnesium electrode；7-negative electrode inert electrode plate；8-blender；9-pH
Meter；10-computer；11-draining pump；12-ammonia aeration pond；13-ammonia absorption plant；14-ammonia nitrogen
Online testing device；15-seal washer；16 clamping devices；17-slot；18-is intake
Mouthful；19-outlet；20-drain pipe.
Detailed description of the invention
As shown in drawings, the inventive system comprises two-compartment reactor 1, PEM 2,
Aeration tube 3, aeration pump 4, constant current source 5, anode contains magnesium electrode plate 6, negative electrode inert electrode
Plate 7, blender 8, pH meter 9, computer 10, draining pump 11, ammonia aeration pond 12, ammonia
Absorption plant 13, ammonia nitrogen online testing device 14, seal washer 15, clamping device 16；Long
Square opening 17, water inlet 18, outlet 19, drain pipe 20.
Anode chamber and cathode chamber that described two-compartment reactor 1 is affixed by sidewall are constituted, the two
Contact sidewall wall length and width are identical, and middle part has slot 17, each length of side of this slot
Contact 0.65～0.85 times of the corresponding length of side of sidewall wall with cathode chamber for anode chamber, cathode chamber and
Clamping PEM 2 by clamping device 16 between both anode chambers contact sidewall, proton is handed over
Change film both sides and seal washer 15, anode chamber and negative electrode are set with anode chamber and cathode chamber contact position
Water body in room is separated by, and reveals without water body, also avoids the pH that cathode chamber reaction promotes simultaneously
Have influence on the pH condition of anolyte reaction chamber.Anode chamber and cathode chamber all have outlet 19 and
The waste water of water inlet 18, cathode chamber and anode chamber can pass through outlet 19, drain pipe 20 and row
Water pump 11 enters ammonia aeration pond 12.The stirring paddle of blender 8 is immersed in the water body of anode chamber,
PH meter 9 probe is immersed in anode chamber's water body, is placed in anode chamber's water body containing magnesium electrode plate 6,
Being connected with the positive pole of constant current source 5 as positive plate, cathode chamber water body put into by inert electrode plate 7
In, be connected the magnesium as minus plate, in the case of energising, on magnesium plate with the negative pole of constant current source 5
Atom loses electronics and becomes magnesium ion and be dissolved in water body, Mg simultaneously+With H2O reacts generation
OH-, the magnesium source needed for providing for ammoniomagnesium phosphate crystal reaction and alkaline environment；Aeration tube 3 one
End connects aeration pump 4, and the other end leads in ammonia aeration pond 12；Computer 10 and aeration pump 4,
Constant current source 5, blender 8, pH meter 9, draining pump 11, ammonia nitrogen online testing device 13
Be respectively connected with, mainly according to pH and NH 3 Data Control aeration pump 4, constant current source 5,
Blender 8 and the start and stop of draining pump 11.
Anode chamber and cathode chamber contact position are flange arrangement, and clamping device clamps the mode of proton membrane
It is by flange bolt, or the U-shaped folder of flange clamps anode chamber, seal washer, proton successively
Film, seal washer and cathode chamber；The outer ring length of side of seal washer is that anode chamber contacts with cathode chamber
1～1.2 times of the sidewall correspondence length of side, the inner ring length of side of seal washer is that anode chamber connects with cathode chamber
In contacting surface 1～1.2 times of the slot correspondence length of side, PEM is rectangle, its length of side
For 1.1～1.2 times of the seal washer inner ring correspondence length of side, make only to deposit between anode chamber and cathode chamber
Pass through at ion selectivity, but without water body exchange, without water body leakage, effectively maintain anode chamber's phosphorus
The required pH condition of acid ammonium magnesium crystallization.Anode containing magnesium mass percent in magnesium electrode plate reach 95% and
Above.
The maximum of this device is characterised by that anode chamber is separated by by exchange membrane with the water body in cathode chamber,
And reveal without water body, negative and positive the two poles of the earth are only deposited selectivity ion permeable between room, are beneficial to control anode
Room water body pH slowly rises, and beneficially ammoniomagnesium phosphate crystal reaction is carried out；Ammonia aeration pond and ammonia are inhaled
Receipts pond is fully reclaimed two-compartment reactor electrolysis process and is obtained ammonia nitrogen in alkalescence water outlet, strengthens waste water nitrogen
Phosphorus organic efficiency, specific works principle is as follows:
The electrolysis that can continue in two-compartment reactor electrolytic process produces Mg+Or Mg2+Ion,
With the PO in waste water4 3-Or PO4 3-And NH4 +Reaction produces magnesium phosphate or magnesium ammonium phosphate respectively
Precipitation.Its main chemical reactions is shown below:
Anode (magnesium plate): Mg-e-=Mg+ (1)
Mg++H2O=Mg2++1/2H2+OH- (2)
Or Mg-2e-=Mg2+ (3)
Negative electrode (inert electrode): O2+4e-+2H2O=4OH- (4)
Or 2H++2e-=H2 (5)
In waste water:
3Mg2++2HnPO4 3-n+22H2O=Mg3(PO4)2·22H2O+2nH+ (6)
Or Mg2++NH4 ++HnPO4 3-n+6H2O=MgNH4PO4·6H2O+nH+ (7)
From formula (2) and (4), in electrochemical reaction process, all there is OH at negative and positive the two poles of the earth-
Produce, under the conditions of the PEM used in without the present invention, certainly will cause in course of reaction
Wastewater pH is increased sharply.When pH is more than 10, containing Mg2+、NH4 +And PO4 3-Reaction system
In, chemical reaction is based on formula (6), and crystalline deposit is mainly magnesium phosphate；PH arrives 7.5
Time between 10, containing Mg2+、NH4 +And PO4 3-Reaction system in, chemical reaction is with formula
(7) it is main, crystallizes as ammoniomagnesium phosphate.To this end, pH is to obtain phosphorus in control reaction system
Acid ammonium magnesium rather than the key of magnesium phosphate crystallization.
In the present invention, the water body that have employed between PEM isolation anode chamber and cathode chamber is handed over
The method changed, stops cathode chamber OH-Moving to anode chamber, slowing down cathode room pH rises sun
The interference of room, pole ammoniomagnesium phosphate crystal process, beneficially anode chamber pH controls, and then improves sun
Ammoniomagnesium phosphate crystal thing purity in the precipitate of room, pole.It addition, in two-compartment reactor wastewater electrolytic
Rear pH raises, and i.e. alkalizes, and in waste water, the ammonia nitrogen of residual is many exists with free ammonia, passes through
Ammonia aeration can further improve waste water nitrogen organic efficiency.
The method reclaiming waste water nitrogen phosphorus is need to waste water to be processed input anode chamber and cathode chamber
In, keep indoor, negative and positive the two poles of the earth liquid level concordant, adjust the die opening between minus plate and positive plate extremely
Setting value, opens blender and makes the water mixing in anode chamber uniform, open constant current source, adjust
Economize on electricity flow valuve, reaches to preset electric current density, starts electrolysis, and anode monitored in real time by pH meter
Indoor water body pH also feeds back to computer, when the numerical value of pH meter monitoring reaches setting value or
When response time reaches setting value, computer controls controller and cuts out constant current source and blender,
Opening water discharge pump, in two-compartment reactor, waste water enters ammonia aeration pond, opens aeration pump, blows at ammonia
Aeration in de-pond, the ammonia-containing gas that ammonia aeration pond stripping goes out is passed through discharge after ammonia absorption plant, ammonia
Ammonia nitrogen in waste water concentration feed back to computer in nitrogen online testing device real-time testing ammonia aeration pond,
When ammonia nitrogen concentration amplitude of variation is less than 10% or when the response time reaches setting value, computer control
Controller processed cuts out aeration pump, after crystalline deposit thing recovery in waste water, the emptying of ammonia aeration pond, double
Room reactor is intake again, opens blender and constant current source, repeats above-mentioned subsequent step and carries out
The waste water recovery of nitrogen and phosphorus of a new round.Saturated conditions, periodic replacement is absorbed according to ammonia absorption plant ammonia
Ammonia absorbent or absorbing liquid.During electrolysis, current density range is at 14.3A/m2～142.9A/m2It
Between；Battery lead plate die opening is 3～6cm.
With example, the present invention is further described below in conjunction with the accompanying drawings:
Embodiment 1:
With reference to Fig. 1, by contacting, sidewall is affixed two-compartment reactor, to contact sidewall wall size identical
Cube anode chamber (8 × 8 × 8cm3) and cathode chamber (8 × 8 × 8cm3) composition, anode chamber
Contact correspondence on sidewall with cathode chamber and have slot, by flange spiral shell between the two contact sidewall
Stud structure clamps anode chamber, plastic seal packing ring, PEM, another plastic seal successively
Packing ring and cathode chamber, it is to avoid water body is revealed and water body exchanges.Test utilizes above-mentioned two-compartment reactor
Process simulated wastewater (2mmol/L NH4 +,2mmol/L PO4 3-) front, add 1 to simulated wastewater
The mol/L NaOH solution regulation initial pH of simulated wastewater is 7.0, utilizes NaCl to regulate solution
Initial electrical conductivity is 10mS/cm.Injecting with each room of backward two-compartment reactor need to be to be processed
The each 500mL of simulated wastewater, and keep the water surface concordant.Magnesium plate (AZ91D) is put into wherein
One indoor, connects positive source subsequently and is referred to as anode chamber as sacrificial anode, Mei Bansuo sections.
Corrosion resistant plate is put into another indoor, be connected as negative electrode with power cathode subsequently.Adjust simultaneously
The position of whole two battery lead plates is to die opening 4cm set, and by pH meter probe and blender
Stirring vane submergence is in the anode compartment.Starting agitator, rotating speed is about 150r/min, makes sun
Extremely indoor water mixing is uniform, and opens constant current source, and regulation electric current is to setting value 0.1A
(electric current density is 28.6A/m2), start electrolysis.Test duration 1.5h, test is every 15min
Anode water body is carried out pH measurement.
Above-mentioned magnesium anode two-compartment reactor electrolytic simulation waste water result shows there is PEM
Two-compartment reactor electrolysis wastewater 60min, anode chamber water body pH rise to 9.0 from 7.0.
Remove in above-mentioned magnesium anode two-compartment reactor and be electrolysed simulated wastewater of the same race after PEM,
Result shows, without the magnesium anode two-compartment reactor electrolysis wastewater 60min, anode chamber water body pH of film
10.2 are risen to from 7.0.
Therefore, PEM can effectively delay the rising of anode chamber pH.
Embodiment 2:
With reference to Fig. 1, by contacting, sidewall is affixed two-compartment reactor, to contact sidewall wall size identical
Cube anode chamber (8 × 8 × 8cm3) and cathode chamber (8 × 8 × 8cm3) composition, anode chamber
Contact correspondence on sidewall with cathode chamber and have slot, by flange spiral shell between the two contact sidewall
Stud structure clamps anode chamber, plastic seal packing ring, PEM, another plastic seal successively
Packing ring and cathode chamber, it is to avoid water body is revealed and water body exchanges.The most defeated to anode chamber and cathode chamber
Enter 500mL pig farm biogas slurry supernatant, and keep two extremely indoor water surface elevations concordant.Meanwhile,
Blender stirring paddle and pH meter probe are immersed in the water body of anode chamber.Magnesium electrode plate will be contained
(AZ91D) putting into anode chamber, cathode chamber put into by inert electrode plate (rustless steel).By leading
Stabilized power source positive pole is connected magnesium electrode plate by line, and negative pole connects inert electrode plate.According to setting pole
Spacing (4cm) fixed electrode Board position.Start blender, make the water mixing in anode chamber
Uniformly, and opening constant current source, to 0.10A, (electric current density is 28.6A/m to regulation electric current2),
Start electrolysis.Being connected with aeration pump aeration tube one end, the other end is immersed in ammonia aeration pond.
According to the numerical value of pH meter feedback, control the switch of aeration pump, blender and constant current source.When
When the numerical value of pH meter reaches setting value (pH=9), close constant current source, stop blender,
The room draining of negative and positive the two poles of the earth, draining enters ammonia-nitrogen desorption pond by drain pipe and draining pump, opens exposure
Air pump is at ammonia aeration pond aeration.After the aeration 2h of ammonia aeration pond, close aeration pump.Aeration terminates
After, in ammonia aeration pond, waste water stands 30min, and precipitation is collected by filtration subsequently.In electrolytic process,
Collect the sample of 6mL every 15 minutes, carry out the assay of ammonia nitrogen and phosphorus, and to precipitation
Carry out XRD determining.
Result of the test shows, in two-compartment reactor electrolytic process, biogas slurry tp removal rate in pig farm is
75.73% (calculating with mass concentration), ammonia nitrogen removal frank is 34.69% (calculating with mass concentration).
After aeration 2h, ammonia nitrogen removal frank improves 32%.XRD result shows, electrolysis obtains precipitate
It is mainly composed of ammoniomagnesium phosphate (MgNH4PO4·6H2O), possibly together with part carbonic acid in precipitate
Calcium.
Claims (9)
1. the device being used for reclaiming waste water nitrogen phosphorus, it is characterised in that include two-compartment reactor
(1), PEM (2), aeration tube (3), aeration pump (4), constant current source (5),
Containing magnesium electrode plate (6), inert electrode plate (7), blender (8), pH meter (9), calculate
Machine (10), draining pump (11), ammonia aeration pond (12), ammonia absorption plant (13), ammonia nitrogen exists
Line test device (14), seal washer (15), clamping device (16), slot (17),
Water inlet (18), outlet (19) and drain pipe (20)；
Anode chamber and cathode chamber that described two-compartment reactor (1) is affixed by sidewall are constituted, and two
The contact sidewall wall size of person is identical, and middle part has slot (17), this contact sidewall
Between clamp PEM (2), PEM (2) both sides by clamping device (16)
Arranging seal washer (15) with anode chamber and cathode chamber contact position, anode chamber all opens with cathode chamber
Having water inlet (18) and outlet (19), the waste water in cathode chamber and anode chamber can pass through out
The mouth of a river (19), drain pipe (20) and draining pump (11) enter ammonia aeration pond (12)；Stirring
The stirring paddle of machine (8) is immersed in the water body of anode chamber, and pH meter (9) probe is immersed in sun
In the water body of room, pole, (6) containing magnesium electrode plate are placed in anode chamber's water body, with constant current source (5)
Positive pole be connected as positive plate, inert electrode plate (7) is put in cathode chamber water body, with perseverance
The negative pole of stream power supply (5) is connected as minus plate；Aeration tube (3) one end connects aeration pump (4),
The other end leads in ammonia aeration pond (12), and ammonia aeration pond is equipped with ammonia nitrogen on-line testing in (12)
Device (14), the ammonia-containing gas that stripping goes out is passed through ammonia absorption plant (13)；Computer (10)
With aeration pump (4), constant current source (5), blender (8), pH meter (9), draining pump (11),
Ammonia nitrogen online testing device (14) is respectively connected with.
Device for reclaiming waste water nitrogen phosphorus the most according to claim 1, its feature exists
In, it is to pass through flange that described clamping device (16) clamps the mode of PEM (2)
Bolt, or the U-shaped folder of flange clamps anode chamber's sidewall and this side seal packing ring (15), matter successively
Proton exchange (2), another seal washer (15) and cathode chamber sidewall.
Device for reclaiming waste water nitrogen phosphorus the most according to claim 1, its feature exists
In, described slot (17), its each length of side is that anode chamber contacts sidewall wall with cathode chamber
0.65～0.85 times of the face correspondence length of side.
Device for reclaiming waste water nitrogen phosphorus the most according to claim 1, its feature exists
In, the outer ring length of side of described seal washer (15) is that anode chamber contacts sidewall wall with cathode chamber
1～1.2 times of the face correspondence length of side, the inner ring length of side of seal washer (15) is anode chamber and negative electrode
1～1.2 times of the corresponding length of side in room contact sidewall wall slot (17).
Device for reclaiming waste water nitrogen phosphorus the most according to claim 1, its feature exists
In, described PEM (2) is rectangle, in its length of side is seal washer (15)
1.1～1.2 times of the corresponding length of side of circle.
Device for reclaiming waste water nitrogen phosphorus the most according to claim 1, its feature exists
In, described containing magnesium mass percent in magnesium electrode plate (6) reach 95% and more than.
7. application device as described in any one of claim 1-6 carries out reclaiming waste water nitrogen phosphorus
Method, it is characterised in that comprise the steps: need to waste water to be processed input anode chamber and
In cathode chamber, keep indoor, negative and positive the two poles of the earth liquid level concordant, adjust the pole between minus plate and positive plate
Spacing to setting value, is opened blender (8) and is made the water mixing in anode chamber uniform, open
Constant current source (5), starts electrolysis, water body pH in pH meter (9) monitoring in real time anode chamber
And feed back to computer (10), when the numerical value that pH meter (9) is monitored reaches setting value or anti-
When reaching setting value between Ying Shi, computer (10) controls to cut out constant current source (5) and stirring
Machine (8), opening water discharge pump (11), waste water enters ammonia aeration pond (12), opens aeration pump (4),
Aeration in ammonia aeration pond (12), the ammonia-containing gas that ammonia aeration pond stripping goes out is passed through ammonia and absorbs dress
Put (13) to discharge afterwards, ammonia nitrogen online testing device (14) monitoring ammonia aeration pond (12) in real time
Interior ammonia nitrogen in waste water concentration also feeds back to computer (10), when ammonia nitrogen concentration amplitude of variation is less than 10%
Time or response time when reaching setting value, computer (10) controls to cut out aeration pump (4), useless
After crystalline deposit thing recovery in water, ammonia aeration pond (12) emptying, two-compartment reactor is entered useless again
Water, opens blender (8) and constant current source (5), repeats above-mentioned subsequent step and carry out new one
The waste water recovery of nitrogen and phosphorus of wheel, absorbs saturated conditions according to ammonia absorption plant (13) ammonia, the most more
Change ammonia absorbent or absorbing liquid.
The method of recovery waste water nitrogen phosphorus the most according to claim 7, it is characterised in that
During described electrolysis, current density range is at 14.3A/m2～142.9A/m2Between.
The method of recovery waste water nitrogen phosphorus the most according to claim 7, it is characterised in that
Described die opening is 3～6cm.
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| CN107487814A (en) * | 2017-08-21 | 2017-12-19 | 吉林大学 | A kind of electrochemical method of high ammonia nitrogen and high phosphorized waste water recycling |
| CN109133486A (en) * | 2017-06-16 | 2019-01-04 | 成都友益佳环保设备工程有限公司 | A kind of environment protection water closet urine high ammonia-nitrogen wastewater step recycling and qualified discharge method |
| CN109609970A (en) * | 2018-12-21 | 2019-04-12 | 北京林业大学 | A kind of magnesium anode galvano-cautery promotes the system and method for potassium recycling in urine waste water |
| CN110902898A (en) * | 2019-12-05 | 2020-03-24 | 浙江大学 | Device and method for removing nitrogen and phosphorus in sewage by magnesium anode electrodialysis method |
| CN111362365A (en) * | 2020-01-17 | 2020-07-03 | 华中科技大学 | Unpowered nitrogen and phosphorus removal primary battery and preparation method and application thereof |
| CN114524493A (en) * | 2022-01-25 | 2022-05-24 | 中南大学 | Ammonia recovery device and method for electrochemically treating nitrate wastewater |
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