CN1151084C - Three-dimension electrode reactor and use for treating organic waste water - Google Patents
Three-dimension electrode reactor and use for treating organic waste water Download PDFInfo
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- CN1151084C CN1151084C CNB02114740XA CN02114740A CN1151084C CN 1151084 C CN1151084 C CN 1151084C CN B02114740X A CNB02114740X A CN B02114740XA CN 02114740 A CN02114740 A CN 02114740A CN 1151084 C CN1151084 C CN 1151084C
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Abstract
The present invention relates to a three-dimension electrode reactor and an application thereof in treating organic waste water. The three-dimension electrode reactor comprises a bed body 5, a feed negative electrode 1, a feed positive electrode 6, a particle electrode 2, a water-distributing plate 9, an aeration plate and a DC power supply 8. The three-dimension electrode reactor uses electric energy as excitation energy, uses cheap air as a raw material and uses the particle electrode containing an initiating agent as a working electrode. The three-dimension electrode reactor can produce strong oxidizing agents of H2O2 and OH in site, and thus, can effectively make oxidation-decomposition. The three-dimension electrode reactor can even completely mineralize organic pollutants into inorganic materials of CO2, water, etc. The three-dimension electrode reactor can be used for pre-treating organic waste water with high concentration and low biodegradability, and the organic waste water are decomposed into organic materials with small molecular weight and high biodegradability, so the biodegradability of waste water is greatly improved. The three-dimension electrode reactor can also be used for the post treatment of a waste water biodegradability technology so as to ensure the standard discharge of the waste water.
Description
Technical field
The present invention relates to a kind of three-diemsnional electrode electrochemical reaction appts that can produce hydroxyl radical free radical.
Background technology
The processing of organic pollutant, especially high concentration organic contaminant is the difficult point and the focus of our times Industrial Wastewater Treatment.The deep oxidation technology (AOTs) that people such as Glaze propose provides an important approach (W.H.Glaze for administering organic pollutant, F.Beltranand T.Tuhkanen, Water Pollution Res.J.Canada, 1992,27:23), become a water treatment new technology among developing rapidly.Its principal character is to make full use of free radical, the extremely strong oxidisability of the OH of hydroxyl radical free radical particularly, meeting is the oxidative degradation organic pollutant up hill and dale, and novel method and the relevant device of therefore researching and developing effective and cheap hydroxyl radical free radical (OH) generation are very significant.
3 D electrode reactor has bigger dignity ratio, mass transfer effect and high current efficient preferably, be a kind of have higher practicality and theoretical electrochemical reactor that is worth, it has obtained many application in wastewater treatment, but all concentrate on the processing of heavy metal ion-containing waste water at present mostly, and at the research in organic waste water field actually rare (Simonsson, D.Chem.Soc.Rev.1997,26 (3), 181-189).
Summary of the invention
The purpose of this invention is to provide a kind of three-diemsnional electrode electrochemical reaction appts, this device can produce the extremely strong hydroxyl radical free radical of oxidisability, can decompose organic pollutant in the waste water rapidly up hill and dale.
3 D electrode reactor of the present invention is made of bed body, electrode cathode, electrode anode, granule electrode, water distributor or plate, aeration tube or plate and direct supply; Electrode cathode and electrode anode are composited by graphite and polyester non-woven fabric barrier film, place a body both sides respectively, and are connected with anodal with the negative pole of direct supply respectively; Granule electrode is filled in the body; Water distribution board and aeration board lay respectively at a body upper and lower part, and there is water inlet the water distribution board top, and there is inlet mouth the aeration board below; Bed body bottom also has water outlet.
The one-tenth of the granule electrode in the aforesaid 3 D electrode reactor is grouped into by weight and is generally: as the carbon of matrix or/and iron filings 85-96%, initiator 3-10%, binding agent 1-5%.Initiator wherein is made up of platinum, palladium and multiple metal oxide, usually form by the oxide compound of the copper of the zinc of the cobalt of the nickel of the Manganse Dioxide that accounts for granule electrode total weight percent 1-4%, 0.01% platinum, 0.02% palladium and 0.77-2%, 0.2-0.3%, 0.5-2%, 0.5-1.67%; Binding agent is Suo Jia base Xian Wei Su Na.
Said granule electrode can be prepared from by following method: by required proportioning with initiator, carbon or/and iron filings and binding agent to add the water mechanically mixing even, extruder grain, then under 200 ± 20 ℃ and anaerobic condition, heat and the binding agent in the granule electrode carried out charing in 2-3 hour, be warming up to 350 ± 20 ℃ of activation 2-3 hour again.
The granular size of the granule electrode of 3 D electrode reactor of the present invention is generally 4-6mm.
3 D electrode reactor of the present invention can be used for efficiently handling organic waste water.
Utilize hydroxyl radical free radical to handle organic waste water three essential conditions are arranged: the one, excitation energy, the 2nd, initiator, the 3rd, appropriate reaction conditions.Reactor of the present invention is as excitation energy with cheap electric energy.Two electron reductions take place in purity oxygen that feeds in this reactor or air on granule electrode under the exciting of pulse direct current, produce the status nascendi H with certain oxidisability
2O
2Its reaction is as follows:
These status nascendis H
2O
2The Fenton-like reaction takes place under the catalysis of the initiator in granule electrode then, produces the extremely strong hydroxyl radical free radical of oxidisability:
(M is a metal in the formula)
Employed granule electrode has organic effect in the enrichment solution, so that the high reactivity OH on granule electrode surface had an opportunity fully to contact with organic pollutant before by the water molecules cancellation, therefore can be rapidly mineralising organic pollutant effectively and up hill and dale:
(R is an organism in the formula)
The efficient of this reactor depends primarily on two kinds of active intermediate products, H from the above analysis
2O
2And OH.We measure and have confirmed two kinds of active intermediate products of key, H with diverse ways
2O
2With OH existing in this reactor (seeing Fig. 1 and 2).The life-span of hydroxyl radical free radical is very short, can not directly measure its ESR signal, needs to adopt spin trapping ESR method.The present invention adopts trapping agent commonly used 5, and 5-dimethyl-1-pyrroles-nitrogen oxidation DMPO detects the hydroxyl radical free radical that this 3 D electrode reactor produced.Its detected result is seen Fig. 3.Can obviously see the feature quartet of DMPO-OH ESR spectrum on scheme, g-factor is 2.007, matches with the theoretical value of hydroxyl free.After adding hydroxyl radical free radical inhibitor N.F,USP MANNITOL, above-mentioned feature quartet disappears.These test-results can regard that the on-the-spot electricity of this 3 D electrode reactor energy causes the admissible evidence of hydroxyl radical free radical as.
The above explanation, 3 D electrode reactor of the present invention, be with electric energy as excitation energy, be raw material with the air of cheapness, be the 3 D electrode reactor of working electrode with the granule electrode that contains initiator.This reactor can on-the-spotly produce strong oxidizer H
2O
2And OH, thereby oxygenolysis effectively, even the permineralization organic pollutant is CO
2With inorganicss such as water.It both can be used for the pre-treatment of the organic waste water of high density and bio-refractory, made it to be decomposed into the less organism that is easy to microbiological deterioration of molecular weight, thereby improved the biodegradability of waste water greatly; Also can be used for the aftertreatment of wastewater biochemical technology, to guarantee standard wastewater discharge.
Description of drawings
Fig. 1 is the structural representation of the embodiment of 3 D electrode reactor of the present invention.
Fig. 2 be 3 D electrode reactor of the present invention under different air pressures, electricity causes H
2O
2Concentration with the variation in reaction times.Test shows that in air pressure electricity causes H not too under the situation of highland
2O
2Concentration increase with the increase of reaction times and air pressure.But when air pressure was too high, because stirring is too violent, oxygen was too short in the residence time on granule electrode surface, so that H
2O
2Concentration reduce on the contrary.The suitable air pressure of this explanation control is to produce higher concentration H
2O
2Essential condition.
Fig. 3 is the DMPO-OHESR spectrogram.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
With reference to Fig. 1, the bed body 5 of 3 D electrode reactor of the present invention can be made rectangle, makes with glass-reinforced plastic material.Electrode cathode 1 and electrode anode 6 place a body both sides respectively, and are connected with anodal with the negative pole of direct supply 8 respectively; Electrode is composited with graphite and polyester tNonwovens barrier film, and barrier film mainly works to the variation buffering of actual industrial waste water ionic strength; Water distribution board 9 and aeration tube or aeration board 10 lay respectively at a body upper and lower part; Granule electrode 2 is filled in wherein.The size of bed body, two distance between electrodes can be regulated according to the water yield of the waste water of handling and the character of waste water.Waste water enters the reactor by water distribution board from water inlet 7; Pressurized air from the inlet mouth 3 of reactor bottom by micropore aeration pipe or micro-pore aeration plate 10 to reactor aeration and and the mixing of waste water adverse current; Waste water after reaction treatment is discharged from water outlet 4.
When 3 D electrode reactor of the present invention is used to handle organic waste water, start air compressor aeration in reactor earlier, open water intaking valve then and advance waste water, connect direct supply, regulate suitable voltage and air flow quantity, waste water is discharged from water outlet after treatment.
Below by specific embodiment application and the effect thereof of 3 D electrode reactor of the present invention in handling organic waste water is described further:
Example 1
Iron filings with 91.0% (particle diameter is 2-4mm) are matrix, with 2% Manganse Dioxide, 0.01% platinum, 0.02% palladium, 0.5% cupric oxide, 1.5% nickel oxide, 0.27% cobalt oxide and 0.7% oxide compound zinc are initiator, the Suo Jia base Xian Wei Na with 4% is that the particle diameter that binding agent is made is that the 4-6mm granule electrode is a working electrode; Compound with graphite and polyester non-woven fabric barrier film is the 3 D electrode reactor of electrode.At 0.3m
3Under the air flow quantity of/h, the phenol solution to 100mg/l under 20 volts the voltage was handled 60 minutes, and its clearance reaches 92%.To 500mg/l trichoro-aldehyde solution-treated 30 minutes, its clearance reached 95%.
Example 2
Carbon with 90% is matrix, with 2.0% Manganse Dioxide, and 1.0% cupric oxide, 1.25% nickel oxide, 0.22% cobalt oxide, 1.5% oxide compound zinc, 0.01% platinum and 0.02% palladium are initiator, are that particle diameter that binding agent is made is that the granule electrode of 4-6mm is a working electrode with 4% Suo Jia base Xian Wei Na; Compound with graphite and polyester non-woven fabric barrier film is the 3 D electrode reactor of electrode.At 0.16m
3Under the air flow quantity of/h, under 20 volts the voltage to the NaCN solution-treated of 100mg/l 30 minutes, its CN
-Clearance reaches 97%.To trichoro-aldehyde solution-treated 30 minutes, its clearance reached 95%.
Example 3
Iron filings with 90% are matrix, with 3.0% Manganse Dioxide, and 0.77% cupric oxide, 2.1% nickel oxide, 0.3% cobalt oxide, 0.8% oxide compound zinc, 0.01% platinum and 0.02% palladium are initiator, and the Suo Jia base Xian Wei Na with 3% is that the particle diameter that binding agent is made is that the 4-6mm granule electrode is a working electrode; Compound with graphite and polyester non-woven fabric barrier film is the 3 D electrode reactor of electrode.At 0.6m
3Under the air flow quantity of/h, under 28 volts the voltage to the COD of Taiwan printing and dyeing mill
CrConcentration is up to the treatment of dyeing wastewater of 10608mg/l 15 minutes, COD
CrDensity loss is 3672mg/l, its COD
CrClearance is 65.3%, and percent of decolourization is 95%.
Example 4
Guangdong Huizhou Taiwan investment computer enterprise is by different production line discharging D class and E class waste water, its COD
CrConcentration is respectively 986.3 and 340.8mg/l.They are at 30 volts voltage and 0.2m
3Under/h the air flow quantity, through the carbon with 89% is matrix, with 3.5% Manganse Dioxide, 0.375% cupric oxide, 1.8% nickel oxide, 0.3% cobalt oxide, 1.0% oxide compound zinc, 0.01% platinum and 0.015% palladium are initiator, are that particle diameter that binding agent is made is that the granule electrode of 4-6mm is a working electrode with 4% Suo Jia base Xian Wei Na, compound with graphite and polyester non-woven fabric barrier film is that the 3 D electrode reactor of electrode was handled COD 40 minutes
CrConcentration drops to 312.8 and 68.6mg/l respectively, its COD
CrClearance is respectively 68.4% and 79.9%, and percent of decolourization is 100%.
Example 5
Percolate from garbage filling field Pollutant levels height, complicated component, its effective, harmless processing are the difficult problems of world's water treatment field always.The COD of Guangzhou Li Keng percolate from garbage filling field
CrConcentration is up to 4000-6000mg/l and NH
3The concentration of-N is up to 1600-1800mg/l.Through the iron with 89.5% is matrix, with 2.5% Manganse Dioxide, 0.5% cupric oxide, 1.2% nickel oxide, 0.3% cobalt oxide, 1.975% oxide compound zinc, 0.01% platinum and 0.015% palladium are initiator, with 4% Suo Jia base Xian Wei Na is that particle diameter that binding agent is made is that the granule electrode of 4-6mm is a working electrode, and compound with graphite and polyester non-woven fabric barrier film is that the 3 D electrode reactor of electrode was handled 15 minutes; Be substrate through carbon again with 87%, with 4.0% Manganse Dioxide, 1.0% cupric oxide, 1.775% nickel oxide, 0.2% cobalt oxide, 2.0% oxide compound zinc, 0.01% platinum and 0.015% palladium are initiator, with 4% Suo Jia base Xian Wei Na is that particle diameter that binding agent is made is that the granule electrode of 4-6 is a working electrode, compound with graphite and polyester non-woven fabric barrier film is to handle in second step of carrying out 15 minutes of the 3 D electrode reactor of electrode, they reduce to 1040-1579mg/l and 585-810mg/l respectively, and have improved the biodegradability of percolate widely.The percolates of handling through above two steps are again through common Wastewater Treated by Activated Sludge Process, but qualified discharge.
Claims (3)
1. a 3 D electrode reactor is characterized in that this reactor is made of bed body (5), electrode cathode (1), electrode anode (6), granule electrode (2), water distributor or plate (9), aeration tube or plate (10) and direct supply (8); Electrode cathode and electrode anode are composited by graphite and polyester non-woven fabric barrier film, place a body both sides respectively, and are connected with anodal with the negative pole of direct supply respectively; Granule electrode is filled in the body; Water distribution board and aeration board lay respectively at a body upper and lower part, and there is water inlet (7) the water distribution board top, and there is inlet mouth (3) the aeration board below; Bed body bottom also has water outlet (4); The one-tenth of said granule electrode (2) is grouped into by weight and is: carbon is or/and iron filings 85-96%, initiator 3-10%, binding agent 1-5%; Initiator wherein is by weight being made up of the oxide compound of 1-4% Manganse Dioxide and 0.01% platinum, 0.02% palladium, 0.77-2% nickel, 0.2-0.3% cobalt, 0.5-2% zinc, 0.5-1.67% copper; Binding agent is Suo Jia base Xian Wei Su Na.
2. according to the described 3 D electrode reactor of claim 1, it is characterized in that said granule electrode (2) is prepared from by following method: by required proportioning with initiator, carbon or/and iron filings and binding agent add water mixes, extruder grain, then under 200 ± 20 ℃ and anaerobic condition, heating charing 2-3 hour is warming up to 350 ± 20 ℃ of activation 2-3 hour again.
3. according to claim 1 or 2 described 3 D electrode reactors, the granular size that it is characterized in that said granule electrode (2) is 4-6mm.
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Cited By (1)
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| CN101844822A (en) * | 2010-05-11 | 2010-09-29 | 沈阳建筑大学 | Three-dimensional electrode/ electro-Fenton reactor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101844822A (en) * | 2010-05-11 | 2010-09-29 | 沈阳建筑大学 | Three-dimensional electrode/ electro-Fenton reactor |
| CN101844822B (en) * | 2010-05-11 | 2012-09-26 | 沈阳建筑大学 | Three-dimensional electrode/ electro-Fenton reactor |
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