CN1179889C - Treatment method of waste water and its equipment - Google Patents
Treatment method of waste water and its equipment Download PDFInfo
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- CN1179889C CN1179889C CNB021477558A CN02147755A CN1179889C CN 1179889 C CN1179889 C CN 1179889C CN B021477558 A CNB021477558 A CN B021477558A CN 02147755 A CN02147755 A CN 02147755A CN 1179889 C CN1179889 C CN 1179889C
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- electrolysis
- hydrogen peroxide
- waste water
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- oxidation trough
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Abstract
The present invention relates to a method for processing waste water, which comprises the procedures that waste water and a molysite agent are put in an electrolysis/oxidation tank; the pH value is adjusted to lower than 2.5 for an electrolytic oxidation reaction, and hydrogen peroxide is continuously added. The present invention also provides a waste water processing device which comprises the electrolysis/oxidation tank, and the anode of the electrolysis/oxidation tank is an insoluble anode of a flat plate; the cathode is a flat plate metal cathode and is provided with a reflux pump which causes the waste water in the electrolysis/oxidation tank to backwards flow and a device for injecting the hydrogen peroxide. The present invention increases the reaction rate of ferric iron at the cathode by a flat plate reflux type electrolysis method, and therefore, electrochemical reduction efficiency is increased. The hydrogen peroxide is continuously added in reaction processes and can react with reduced ferrous iron so as to endlessly react and generate the ferric iron, so the ratio of the ferric iron to the ferrous iron in the solution is always kept at a high value. Therefore, the present invention can keep high processing efficiency under the conditions of low ferric iron concentration (1000 mg/l) and a high pH value (lower than 2.5). Compared with a known Fenton improvement method, the present invention can obtain high current efficiency under the conditions of high ferric iron concentration (30000 mg/L) and a low pH value (lower than 1), and the present invention accords with economic benefits better.
Description
Technical field
The present invention relates to a kind of sewage treatment equipment,, improve the electrolysis/oxidized waste water facture of electrochemical reduction efficient, be specially adapted to the treatment of Organic Wastewater of high concentration COD (chemical oxygen demand (COD)) particularly relevant for a kind of electrolysis mode that utilizes dull and stereotyped return-flow type.
Background technology
The handling principle of legacy equipment is to utilize interpolation hydrogen peroxide and ferrous ion to react, generation has the organism (being the Fenton method) in hydroxyl free radical (OH) oxidized waste water of high oxidative capacity, to reduce COD, improve water quality, it is one of at present more feasible method, but still there is following shortcoming in this method in practical application:
1. running cost height: in waste water, add pharmaceutical chemicalss such as excessive hydrogen peroxide, ferrous ion, acid and alkali, make to add the running cost height interpolation of ferrous ion and the processing costs of follow-up mud and account for 1/4～1/2.
2. sludge yield height:, therefore finish to produce ironic hydroxide (Fe (OH) in reaction owing in the process of reaction, must add ferrous ion
3) mud, except must further handling, dispose, and can cause secondary pollution to these mud.
Summary of the invention
The present invention provides a kind of treatment facility of removing the waste water of waste water middle and high concentration COD at the problems referred to above, in same reactive tank, carry out the oxidizing reaction of organic pollutant, the ferric iron mud reduction that the Fenton method can be produced simultaneously utilizes, to reduce sludge yield, and can promote its electrolytic reduction efficient, thereby reach the purpose that reduces running cost and promote organic pollutant removal efficient.
Technical scheme provided by the invention is a kind of sewage treatment equipment, comprises electrolysis/oxidation trough, and the anode of electrolysis/oxidation trough is dull and stereotyped insoluble anode; Negative electrode is the flat metal negative electrode; Dull and stereotyped insoluble anode and flat metal negative electrode are crisscross arranged, and electrolysis/oxidation trough is divided into several vertical spaces; The slit is arranged at the upper end and the electrolysis/oxidation trough top of the arbitrary utmost point in dull and stereotyped insoluble anode and the flat metal negative electrode, lower end and electrolysis/oxidation trough airtight connection of bottom; The upper end of another utmost point in flat metal negative electrode and the dull and stereotyped insoluble anode and airtight connection of gas-liquid separation box top, the slit is arranged at lower end and electrolysis/oxidation trough bottom; Be provided with reflux pump that makes the return of waste water in electrolysis/oxidation trough and the device that notes add hydrogen peroxide.
The device that above-mentioned notes add hydrogen peroxide is the hydrogen peroxide storage tank and the hydrogen peroxide in the hydrogen peroxide storage tank is imported pump of constant delivery type in electrolysis/oxidation trough.
The present invention utilizes dull and stereotyped return-flow type electrolysis mode, improve the speed of reaction of ferric iron at negative electrode, and then raising electrochemical reduction efficient, and in reaction process, add hydrogen peroxide continuously, make it and reduce the ferrous iron of gained constantly to react the generation ferric iron, so can make in the solution ferric iron that ferrous ratio is maintained high value always,, still can keep high treatment efficiency even therefore under lower ferric iron concentration (1000mg/L) and higher pH (pH＜2.5).Compared to known Fenton improved method, need higher ferric iron concentration (30,000mg/L) time could obtain high current efficiency with lower pH value (pH＜1), the present invention more meets economic benefit.
Description of drawings
Accompanying drawing is the structural representation of wastewater treatment equipment of the present invention.
Embodiment
Referring to accompanying drawing, the utility model comprises electrolysis/oxidation trough 1, and the anode 3 of electrolysis/oxidation trough 1 is dull and stereotyped insoluble anode; Negative electrode 4 is the flat metal negative electrode, is provided with the reflux pump 2 that makes the return of waste water in electrolysis/oxidation trough 1 and annotates the storage tank 7 that adds hydrogen peroxide and the hydrogen peroxide in the hydrogen peroxide storage tank 7 is imported pump of constant delivery type 6 in electrolysis/oxidation trough.
The present device treating processes is to carry out in electrolysis/oxidation trough 1, and the material of electrolysis/oxidation trough 1 can be nonmetal, for example is that the plastics of PP or PE constitute, and can also be metal material, for example is that the alloy of stainless steel or iron constitutes.The anode 3 of electrolysis/oxidation trough for example is a dull and stereotyped insoluble anode; And its negative electrode 4 for example can be connected to a flat metal negative electrode by a cathode bar to be constituted, to cooperate nonmetallic electrolysis/oxidation trough; If electrolysis/oxidation cell body itself is a metal material, then the flat metal negative electrode can not need cathode bar and directly is linked on electrolysis/oxidation cell body, and negative electrode can be adjusted according to the different of water quality with the anodic number, is not limited to number shown in the drawings.Equipment according to the present invention is at first inserted waste water, molysite reagent in electrolysis/oxidation trough 1.Above-mentioned molysite reagent can be ferrous iron or ferric iron reagent, for example is the aqueous solution of ferrous sulfate, iron protochloride, ferric sulfate or iron(ic) chloride.
Start reflux pump 2, make the waste water of flowing through through being back to electrolysis/oxidation trough 1, and control suitable flow velocity.Then, waste water ph is adjusted to (if waste water ph less than 2.5, promptly need not be adjusted the pH value again) below 2.5, prepare to carry out electrolysis/oxidizing reaction.
Next connect power supply unit 5, and the setting cathode current density is 10～100A/m
2, add simultaneously continuously carry out of the hydrogen peroxide of 5000～50000 milligrams/every liter waste water hour for reaction.
According to the present invention, when the scope of iron salt concentration more than 1000mg/L, when being applied in high concentrated organic wastewater, the clearance of COD can be up to 85%～98%, even higher.
Application Areas of the present invention is quite extensive, comprising:
(1) electroplating industry, PCB industry, metal finishing industry contain the liquid waste disposal of chemical copper, chemical nickel.
(2) chemical industry, regenerated fiber textile industry, paper industry high concentration COD liquid waste disposal.
(3) the laboratory high concentrated organic waste liquid is handled.
The invention will be further described with comparative example by the following examples.
Comparative example: in this comparative example, use 1, the iron concentration of 000mg/L and the quantitative Fenton method of injecting the 7.7g/hr hydrogen peroxide are handled and are contained the aniline waste liquid, aniline can decompose 98% after 4 hours, but aspect the COD removal and to no effect, because of the intermediate oxidation product of aniline and hydrogen peroxide residual COD is risen on the contrary.Detailed operational condition and result are as follows:
One, operational condition:
Anode: titanium base DSA plate electrode
Negative electrode: SUS304 stainless steel flat plate electrode
Cell body specification: 16cm (L) * 15cm (W) * 22cm (H)
Wastewater volume: 4.0L
Total concentration of iron: 1000mg/L
Alr mode: the pump drawing liquid refluxes and stirs
H2O2 feed rate: 0.9mL/min
Power supply mode: direct current: 0A
Current density: negative electrode 0A/m
2, anode 0A/m
2
Two, experimental result:
| Reaction times (hr) | pH | Electric current (A) | Aniline * 10 -2(mole/L) | Aniline clearance (%) | COD(mg/L) | COD clearance (%) |
| 0 | 2.0 | 0.0 | 1.0 | 0 | 2540 | 0 |
| 1 | 2.0 | 0.0 | 0.7 | 30 | 2339 | 7.9 |
| 2 | 2.0 | 0.0 | 0.48 | 52 | 2410 | 5.1 |
| 3 | 2.0 | 0.0 | 0.1 | 90 | 2870 | -13 |
| 4 | 2.0 | 0.0 | 0.04 | 96 | 3048 | -20 |
Embodiment: in the present embodiment, under all identical situation of other condition with comparative example, only increase electrolytic reaction, after 3 hours 80.2% COD clearance is arranged promptly in reaction, it serves to show that the present invention utilizes the disturbed flow type negative electrode to cooperate the mode of electrolytic oxidation reaction, and add hydrogen peroxide constantly, can make reaction be in high current efficiency really always, and promote organic pollutant removal efficient.Detail operations condition and result are as follows:
One, operational condition;
Anode: titanium base DSA plate electrode
Negative electrode: SUS304 stainless steel flat plate electrode
Cell body specification: 16cm (L) * 15cm (W) * 22cm (H)
Wastewater volume: 4.0L
Total concentration of iron: 1000mg/L
Alr mode: the pump drawing liquid refluxes and stirs
H2O2 feed rate: 0.9mL/min
Power supply mode: direct current: 8A
Current density: negative electrode 66.7A/m
2, anode 66.7A/m
2
Two, experimental result:
| Reaction times (hr) | pH | Electric current (A) | Aniline * 10 -2 (mole/L) | Aniline clearance (%) | COD (mg/L) | COD clearance (%) |
| 0 | 2.30 | 8.0 | 1.0 | 0 | 2540 | 0 |
| 1 | 2.08 | 8.0 | 0.21 | 79 | 1981 | 22.0 |
| 2 | 2.09 | 8.0 | 0.02 | 98 | 993 | 68.1 |
| 3 | 2.11 | 8.0 | 0 | 100 | 503 | 80.2 |
| 4 | 2.14 | 8.0 | 0 | 100 | 236 | 90.7 |
Claims (2)
1. sewage treatment equipment, it is characterized in that: comprise electrolysis/oxidation trough, the anode of electrolysis/oxidation trough is dull and stereotyped insoluble anode; Negative electrode is the flat metal negative electrode; Dull and stereotyped insoluble anode and flat metal negative electrode are crisscross arranged, and electrolysis/oxidation trough is divided into several vertical spaces; The slit is arranged at the upper end and the electrolysis/oxidation trough top of the arbitrary utmost point in dull and stereotyped insoluble anode and the flat metal negative electrode, lower end and electrolysis/oxidation trough airtight connection of bottom; The upper end of another utmost point in flat metal negative electrode and the dull and stereotyped insoluble anode and airtight connection of gas-liquid separation box top, the slit is arranged at lower end and electrolysis/oxidation trough bottom; Be provided with reflux pump that makes the return of waste water in electrolysis/oxidation trough and the device that notes add hydrogen peroxide.
2. equipment according to claim 1 is characterized in that: annotate the device add hydrogen peroxide and be the hydrogen peroxide storage tank and the hydrogen peroxide in the hydrogen peroxide storage tank is imported pump of constant delivery type in electrolysis/oxidation trough.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021477558A CN1179889C (en) | 2002-11-28 | 2002-11-28 | Treatment method of waste water and its equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021477558A CN1179889C (en) | 2002-11-28 | 2002-11-28 | Treatment method of waste water and its equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1412124A CN1412124A (en) | 2003-04-23 |
| CN1179889C true CN1179889C (en) | 2004-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021477558A Expired - Fee Related CN1179889C (en) | 2002-11-28 | 2002-11-28 | Treatment method of waste water and its equipment |
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| Country | Link |
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| CN (1) | CN1179889C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101671088B (en) * | 2009-10-15 | 2011-06-22 | 同济大学 | Electrocatalysis wet-type peroxide oxidizing method for high-effect waste water processing and devices thereof |
| CN103073105A (en) * | 2013-02-28 | 2013-05-01 | 陈振选 | Method for removing hard biodegradable organic matters from sewage |
| CN109896593A (en) * | 2017-12-08 | 2019-06-18 | 南京工大开元环保科技（滁州）有限公司 | Handle the electricity-Fenton device and method of high concentrated organic wastewater |
| CN108640232A (en) * | 2018-07-13 | 2018-10-12 | 凯莱英医药集团（天津）股份有限公司 | Wastewater treatment equipment and wastewater treatment method |
| CN108946883A (en) * | 2018-08-10 | 2018-12-07 | 安徽科技学院 | Handle the method and dedicated reactor tank of biomass thermal liquid waste solution |
| CN109052755A (en) * | 2018-09-29 | 2018-12-21 | 苏州登创环境工程技术有限公司 | The processing method of admiro waste water based on electrocatalytic oxidation |
| CN109498825B (en) * | 2019-01-04 | 2023-07-25 | 厦门理工学院 | Household disinfection device |
| CN114735863B (en) * | 2022-05-06 | 2024-04-02 | 南京理工大学 | Treatment method and system for post-landfill leachate |
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- 2002-11-28 CN CNB021477558A patent/CN1179889C/en not_active Expired - Fee Related
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