CN101759253B - Electrochemical treatment method and electrochemical reactor - Google Patents
Electrochemical treatment method and electrochemical reactor Download PDFInfo
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- CN101759253B CN101759253B CN2010103003501A CN201010300350A CN101759253B CN 101759253 B CN101759253 B CN 101759253B CN 2010103003501 A CN2010103003501 A CN 2010103003501A CN 201010300350 A CN201010300350 A CN 201010300350A CN 101759253 B CN101759253 B CN 101759253B
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- water
- electrochemical
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- cell body
- tank body
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Abstract
The invention relates to an electrochemical treatment method and an electrochemical reactor. The electrochemical reactor comprises a cubic tank body. A plurality of polar plates are arranged in the tank body in parallel in the vertical direction. The polar plates are opposite negative and positive polar plates. A flow passage is arranged between the polar plates, and water to be treated flows through the flow passage. The bottom of the tank body is provided with a water inlet, and the top thereof is provided with a water outlet. A return pipeline from the water outlet to the water inlet is arranged outside the tank body. The return step is set in the water treatment, and the water to be treated returns multiple times, therefore the multiple electrochemical reaction treatment can be carried out; the returning water can carry the favorable gases of Cl2, O2 and the like generated in the treatment process into the flow passage, thereby saving the gas collecting equipment and being favorable for the electrochemical treatment process.
Description
Technical field
The invention belongs to the environment protection sewage process field, more specifically, relate to electrochemical process for treating, and wherein used electrochemical reactor.
Background technology
The electrochemical treatment method is a kind of water treatment method that development in recent years is got up, and its basic ideas are that relative positive/negative plate is set, and makes the space between pole plate become runner, make staying water flow through runner, in this process, electrode surface can produce some active intermediate products, as
OH, OCL
-, H
2O
2, O
3Deng, these intermediate products participate in oxidize contaminants, and contaminant degradation is removed.
(1) produce hydroxyl radical free radical (
OH).The oxidizing potential 2.82 of hydroxyl is higher than other strong oxidizing property materials such as chlorine, ozone, hydrogen peroxide, " the active oxygen " of physical adsorption attitude (
OH) mainly play the electrochemical combustion effect, make the organism complete oxidation, this is an irreversible process.What take place when organic concentration is higher is direct electrooxidation, and when organic concentration is low, then take place be with
The reaction of OH, as follows:
H
2O→
·OH+H
++e
Organism+
OH → product
2
·OH→H
2O+1/2 O
2
Class Fenton (Fenton) reaction can take place in electrochemical oxidation, produces
OH oxidation organic pollutant, organic electrochemical oxidation is formed (electrochemistry oxygen with toluene turns to example) by following step:
O
2+2H
++2e→H
2 O
2
M
ox+e→M
red
M
red+H
2 O
2→M
ox+
·OH+OH
-
Toluene+OH → phenyl aldehyde, phenylcarbinol
OH+M
red→M
ox+OH
-
Oxygen molecule generates H in the cathode surface reduction
2O
2, H
2O
2With the as-reduced metal F enton reaction taking place generates
OH, degradation of organic substances.
(2) produce hypochlorite (OCL
-).Organic matter removal is mainly realized by roundabout process during the chloride organic waste water of electrochemical treatment, and promptly the muriate electrochemical oxidation generates hypochlorite, and hypochlorite reoxidizes degradation of organic substances.In containing chlorine solution, OCL
-Realize by following reaction:
2CL
-→CL
2+2e
CL
2+H
2O→HO CL+HCL
HO CL→H
++OCL
-
The indirect oxidation of chlorine/hypochlorite that bright electrolysis produces plays a major role.This method has been effectively applied in the processing of dyeing waste water, formaldehyde waste water, percolate.
Have chlorion to have that following three reactions take place anode under the situation:
HO
-→
·OH+e
CL
-→
·CL+e
2CL
-→CL
2+2e
Following reaction takes place simultaneously:
CL
2+
·OH→HO CL+CL
-
CL
2+2H
2O→HO CL+H
3O
++CL
-
HO CL+H
2O→H
3O
++OCL
-
These have oxygenizement chlorine-bearing compound (
CL, CL
2, OCL
-Deng) and hydroxyl radical free radical (
OH) common oxidative degradation organic pollutant.
(3) produce ozone (O
3).Also have the investigator to think that anode can produce O
3Thereby, the oxidative degradation organism, electrochemical method can online generation O
3, it produces O than atmospherical discharges
3Make things convenient for manyly.O
3Produce by following reaction:
3H
2O→O
3(g)+6e+6H
+
O
2+H
2O→O
3(aq)+2e+2H
+
O
3Have very strong oxidation capacity, can pass through the online generation of electrochemical process O
3, be used for oxidative degradation, sterilization and disinfection of water pollutant etc.
(4) produce hydrogen peroxide (H
2O
2).Do not mentioned O in front
2Get electronics at negative electrode, reduction reaction takes place generate H
2O
2Its forming process may be the O that is adsorbed on the cathod catalyst surface
2By trapped electron, form peroxy ion O
2 -, form H by series reaction then
2O
2
O
2+e→O
2 -
O
2 -+H
+→HO
2 ·
O
2 -+HO
2 ·→O
2+HO
2 -
2HO
2 ·→H
2O
2+O
2
HO
2 -+H
+→H
2 O
2
By aforementioned background art as can be known, electrochemical treatment is complicated chemical reaction process, and the factor that influences treatment effect is also inevitable a lot, and in actual applications, the flow rate of water flow and the residence time are exactly a pair of comparatively contradiction of puzzlement.
Its structure of electrochemical reactor all is that the polylith pole plate is arranged in parallel within the cell body, control current by water distributor, header, aforesaid various electrochemical reactions take place, to reach processing intent in flow through the from bottom to top zone of two pole plates of the current that order need to be handled in this process.
Such treatment process, its effect is also not fully up to expectations; In the reactor use, the problem of pole plate passivation appears easily simultaneously.The applicant causes the flow velocity that has its source in of this problem not enough, thereby causes pole plate that bigger concentration difference is arranged through discovering in a large number, makes the pole plate passivation in the course of time.Simultaneously, flow velocity is crossed and also will be made slowly and the current undercompounding in zone influence treatment effect, also easy settled sludge.And if strengthen pressure simply, artificially improve flow velocity, will make pending current residence time in reactor not enough again, do not reach treatment effect.
Summary of the invention
The objective of the invention is to solve above-mentioned, a kind of electrochemical process for treating of more optimizing is provided because of the low excessively problem of bringing of flow velocity.
Another object of the present invention provides a kind of electrochemical reactor of more reasonable structure.
For realizing first goal of the invention, the technical solution used in the present invention is such: electrochemical process for treating, comprise relative positive/negative plate, under the pole plate switch-on regime, staying water flows through the runner between positive/negative plate, it is characterized in that: in the water body of the runner of flowing through, have at least a part to be back to the runner starting point, flow through runner once more by reflux line.
Further, the water yield that flows through runner for the first time is 1 with the ratio of the water yield of backflow: 0.5-5.
For realizing second goal of the invention, the technical scheme that is adopted is such: electrochemical reactor, comprise the cell body of a cubic, and the in the vertical direction parallel rows is shown some pole plates in the cell body; The cell body bottom is provided with water-in, and the top is provided with water outlet; It is characterized in that: cell body has a reflux line from the water outlet to the water-in outward in addition.
The present invention is provided with the backflow link in water treatment procedure, equaling has increased the flow of runner under the constant situation of treatment capacity; In fact make the pending water body runner of repeatedly flowing through, that is carried out repeatedly handling.So both can improve flow velocity, prolong the residence time of water body in runner again.On the other hand, in electrochemical treatment process, itself can produce Cl
2, O
2Deng gas, these gases are favourable to electrochemical reaction; These gases need collection and treatment separately in the prior art, and these gases are brought in the runner with the water body that refluxes among the present invention, have saved gas collection equipment and have helped electrochemical treatment process.
Description of drawings
Fig. 1 is the structural representation of electrochemical reactor of the present invention.
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
Referring to accompanying drawing, present embodiment comprises a cubical cell body 1, and the in the vertical direction parallel rows is shown some pole plates 2 in the cell body 1, and described pole plate 2 is relative positive/negative plate, the runner that has staying water to flow through between the pole plate 2; Cell body 1 bottom is provided with water-in 3, and the top is provided with water outlet 4, cell body also have outward one from water outlet 4 to water-in 3 reflux line 5, reflux line 5 is provided with a valve 6, reflux ratio can be controlled by valve 6.
Described reflux ratio is for flowing through the ratio of the water yield with the water yield of backflow of runner for the first time.
Embodiment 2
By the present invention certain factory's waste water from dyestuff is handled,, divided four processing same former water.Be prior art for the first time, do not adopt reflux; Second and third, use different reflux ratios four times.Handle under the condition of voltage 100V, electric current 5A for four times, the reaction times all is 10 minutes.
Water quality data after former water and the processing sees the following form.
| Former water | Reflux ratio (1: 0) | Reflux ratio (1: 0.5) | Reflux ratio (1: 1) | Reflux ratio (1: 2) | |
| COD(mg/l) | 6200 | 3500 | 3200 | 2950 | 2900 |
| Colourity | 500 | 90 | 80 | 75 | 75 |
| Flocculation time (min | 30 | 20 | 15 | 18 |
Conclusion: after increasing reflux, all have an appointment 20% the raising of COD clearance and colourity, flocculation time also has minimizing.
Embodiment 3
By the present invention certain factory's heavy metal wastewater thereby is handled 1, same former water divides four processing.Be prior art for the first time, do not adopt reflux; Second and third, the different reflux ratios of four usefulness reflux.Handle under the condition of voltage 100V, electric current 5A for four times, the reaction times all is 10 minutes.
Water quality data after former water and the processing sees the following form.
| Former water | Reflux ratio (1: 0) | Reflux ratio (1: 0.5) | Reflux ratio (1: 1) | Reflux ratio (1: 2) | |
| COD(mg/l) | 200 | 50 | 35 | 32 | 35 |
| Cu ion (mg/l) | 120 | 0.28 | 0.15 | 0.1 | 0.1 |
| Sexavalent chrome (mg/l) | 55 | 0.1 | 0.02 | 0.01 | 0.01 |
| Nickel ion (mg/l) | 35 | 0.1 | 0.05 | 0.02 | 0.05 |
Conclusion: after increasing reflux, COD clearance and removal of heavy metal ions rate have significantly raising.
Claims (3)
1. electrochemical process for treating comprises relative positive/negative plate, under the pole plate switch-on regime, staying water flows through the runner between positive/negative plate, it is characterized in that: in the water body of the runner of flowing through, have at least a part to be back to the runner starting point, flow through runner once more by reflux line.
2. electrochemical process for treating according to claim 1 is characterized in that: the water yield that flows through runner for the first time is 1 with the ratio of the water yield of backflow: 0.5-5.
3. electrochemical reactor comprises the cell body of a cubic, and the in the vertical direction parallel rows is shown some pole plates in the cell body; The cell body bottom is provided with water-in, and the top is provided with water outlet; It is characterized in that: cell body has a reflux line from the water outlet to the water-in outward in addition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010103003501A CN101759253B (en) | 2010-01-15 | 2010-01-15 | Electrochemical treatment method and electrochemical reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010103003501A CN101759253B (en) | 2010-01-15 | 2010-01-15 | Electrochemical treatment method and electrochemical reactor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101759253A CN101759253A (en) | 2010-06-30 |
| CN101759253B true CN101759253B (en) | 2011-05-04 |
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ID=42490660
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010103003501A Active CN101759253B (en) | 2010-01-15 | 2010-01-15 | Electrochemical treatment method and electrochemical reactor |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110451614A (en) * | 2019-08-13 | 2019-11-15 | 北京环球中科水务科技有限公司 | Electroxidation-flocculation reactor, organic wastewater treating system and application |
| CN114920335A (en) * | 2022-06-08 | 2022-08-19 | 重庆普优尔科技有限公司 | Electrolysis unit and multistage electrolysis device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2331415Y (en) * | 1998-03-30 | 1999-08-04 | 武汉纺织工学院 | Electrochemical reactor |
| WO2004056711A1 (en) * | 2002-12-23 | 2004-07-08 | Envirogain Inc. | Method and apparatus for the electrochemical treatment of contaminated aqueous media |
| WO2005087669A1 (en) * | 2004-03-16 | 2005-09-22 | BSH Bosch und Siemens Hausgeräte GmbH | Method for the electrochemical softening of water in a water-bearing household appliance |
| CN2828014Y (en) * | 2005-09-07 | 2006-10-18 | 冯庆中 | Electrochemical reactor |
-
2010
- 2010-01-15 CN CN2010103003501A patent/CN101759253B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2331415Y (en) * | 1998-03-30 | 1999-08-04 | 武汉纺织工学院 | Electrochemical reactor |
| WO2004056711A1 (en) * | 2002-12-23 | 2004-07-08 | Envirogain Inc. | Method and apparatus for the electrochemical treatment of contaminated aqueous media |
| WO2005087669A1 (en) * | 2004-03-16 | 2005-09-22 | BSH Bosch und Siemens Hausgeräte GmbH | Method for the electrochemical softening of water in a water-bearing household appliance |
| CN2828014Y (en) * | 2005-09-07 | 2006-10-18 | 冯庆中 | Electrochemical reactor |
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| CN101759253A (en) | 2010-06-30 |
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Assignee: Hangzhou Huishui Technology Co., Ltd. Assignor: Wang Wanshou Contract record no.: 2011330001085 Denomination of invention: Electrochemical treatment method and electrochemical reactor Granted publication date: 20110504 License type: Exclusive License Open date: 20100630 Record date: 20110819 |
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Owner name: HANGZHOU HUISHUI TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: WANG WANSHOU Effective date: 20120206 |
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Effective date of registration: 20120206 Address after: Hangzhou City, Zhejiang province Binjiang District 310052 shore road 1180 No. 2 building 106-110 Patentee after: Hangzhou Huishui Technology Co., Ltd. Address before: 310052 Yao Xing building, 518 Jiangnan Avenue, Hangzhou, Zhejiang, 13-4, Binjiang District Patentee before: Wang Wanshou |