CN100591630C - Monocrystalline silicon or carbon-base monocrystalline silicon electrode electrolysis oxidation treatment method for organic chemical sewage - Google Patents
Monocrystalline silicon or carbon-base monocrystalline silicon electrode electrolysis oxidation treatment method for organic chemical sewage Download PDFInfo
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- CN100591630C CN100591630C CN200810023591A CN200810023591A CN100591630C CN 100591630 C CN100591630 C CN 100591630C CN 200810023591 A CN200810023591 A CN 200810023591A CN 200810023591 A CN200810023591 A CN 200810023591A CN 100591630 C CN100591630 C CN 100591630C
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- monocrystalline silicon
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Abstract
The invention relates to a method for treating chemical sewage by electrolytic oxidation through using a single-crystal silicon or carbon-based single-crystal silicon electrode, which comprisesg the following steps of: collecting sewage generated in organic chemical industries in a sewage tank, and controlling the retention time of sewage in the sewage tank over 48 hours; introducing the sewage inthe sewage tank into a settling tank, and settling; and removing sludge from the settled sewage, performing electrolytic oxidation with single-crystal silicon as an electrode, and adjusting pH value.The inventive method can treat sewage either in acid condition or in base condition. Thus, the content of inorganic salt may not increase again during the entire sewage treatment process, so as to shorten sewage treatment process, reduce sewage disposal investment, and simplify the sewage treatment operation.
Description
Technical field
The present invention relates to a kind of sewage water treatment method.Particularly relate to a kind of silicon single crystal or carbon-base monocrystalline silicon electrode electrolysis oxidation and handle the method for the sewage that produces in the difficult degradation organic chemical industry production process.Belong to the industrial sewage treatment technology field.
Background technology
In the synthetic production process of organic chemical industry, can produce a certain amount of sewage.Such sewage mainly is to contain complicated organism, inorganic salt etc., pollutent more complicated intractability is bigger in the sewage that produces in organic chemical industry's building-up process, bigger with general chemicals logos intractability, this mainly is that a certain amount of regular ring compound is arranged in the organic synthesis process, the material of heterogeneous ring compound and some long-chains produces, these foreign organic matters that are dissolved in the sewage are difficult to degraded, the B/C value of sewage is very little, almost be not have biochemical possibility, but just must carry out necessary pre-treatment to these materials in order to dispose of sewage, change their B/C value, improve the biodegradability energy of sewage, make sewage obtain radical cure.But these pollutents are handled with general chemical process and are difficult to reach pretreated requirement, and one is the structure that will as far as possible change pollutent in the raw waste water in actual sewage is handled, and reduces the COD of sewage as far as possible; The 2nd, try one's best in treating processes no longer increases the amount of inorganic salt in the sewage, is that next step advanced treatment reduces difficulty like this.
Before the present invention made, the method that electrolytic process is handled organic chemical industry sewage was roughly as follows:
Step 1, sewage are concentrated
With concentrated the placing in the sewage lagoon of sewage that produces in the synthetic production process of organic chemical industry, the residence time of sewage in sewage lagoon was controlled at more than 48 hours,
Step 2, acidifying
Sewage in the sewage lagoon is fed acidification pool, add sour adjust pH in the acidification pool, control pH≤4,
Step 3, the little electrolysis of sewage
The sewage that acidifying is good enters micro-electrolysis device, and pH is adjusted in acid, and control pH value is 2.5～3.5, and the time was controlled at 2～3 hours, and consumption is a 3-4kg/ ton sewage,
Step 4, sedimentation, catalytic and oxidative electrolysis technology
Sewage after little electrolysis is removed mud after sedimentation, carry out catalytic and oxidative electrolysis technology, adds quantitative H during catalytic and oxidative electrolysis technology
2O
2, oxidization time 1.5～2.5 hours,
Step 5, neutralization, sedimentation, enter biochemical system
Sewage neutralizes with alkali behind the catalytic and oxidative electrolysis technology, and sewage enters biochemical system after sedimentation, sewage discharge after biochemical treatment.
This method catalytic and oxidative electrolysis technology must carry out under acidic conditions, and such one is the amount that will increase inorganic salt in the sewage treatment process, and this can bring difficulty and increase amount of investment advanced treatment of wastewater; The 2nd, regulate so just the prolonged flow process of sewage disposal and the direct investment of sewage owing to will carry out the pH value to sewage; The 3rd, the sludge quantity after the sewage disposal increases unfavorable sewage disposal.
Summary of the invention
The objective of the invention is to overcome the weak point of the organic chemical industry sewage of catalytic and oxidative electrolysis technology method processing in the past, provide a kind of silicon single crystal or carbon-base monocrystalline silicon electrode electrolysis oxidation that under acid and alkaline condition, all can carry out sewage disposal to handle method for organic chemical sewage.
The object of the present invention is achieved like this: a kind of silicon single crystal or carbon-base monocrystalline silicon electrode electrolysis oxidation are handled method for organic chemical sewage, it is characterized in that described method mainly comprises following processing step:
1), sewage is concentrated
The sewage that produces in organic chemical industry's production process concentrated place in the sewage lagoon, the residence time of sewage in sewage lagoon was controlled at more than 48 hours,
2), sedimentation
Sewage in the sewage lagoon is fed the settling bowl sedimentation, can have a certain amount of particulate matter in some sewage, by can be after the sedimentation so that sewage becomes clean.
3), electrolytic oxidation
Sewage is removed mud after sedimentation, carry out electrolytic oxidation with silicon single crystal or carbon-base monocrystalline silicon as electrode, oxidization time 1～10 hour, oxidation current density 5～20mA/cm
2Can change the structure of feature pollutent in the 95% above sewage behind the electrolytic oxidation, make the change of the structure generation essence of feature pollutent in the sewage, the B/C value is greatly improved, can carry out biochemical treatment, the COD of sewage also can reduce more than 60% simultaneously, and described carbon-base monocrystalline silicon is that monocrystalline silicon piece is sticked to the charcoal primary surface.
4), pH adjusts
Owing to have a certain amount of inorganic salt and organism in the sewage, certain variation can take place in the pH value of some sewage under electrolytic condition after the electrolysis, so reaction finishes the back also to be needed to carry out necessary adjustment to sewage, is beneficial to next step biochemical treatment.
Silicon single crystal or carbon-base monocrystalline silicon are made the principle that electrode is handled organic chemical industry sewage:
Silicon single crystal is a kind of semiconductor material, under the triggering of electric field, can produce hole effect, the hole produces high energy proton and high-energy electron, high energy proton and high-energy electron respectively with sewage in dissolved oxygen and water generation chemical reaction, produce the extremely strong hydroxyl radical free radical (OH) of oxidation capacity, this free radical (OH) can with the transfer of organic compound generation free radical in the sewage, attack organic chain, make and reactions such as organism generation chain rupture open loop thoroughly change the organic constitution in the sewage.Along with the organism chain shortens gradually or finally becomes inorganic carbonic acid gas, water etc., make sewage be effectively addressed, such one is the chemical structure that has changed sewage, reduces the difficulty that sewage is further handled; The 2nd, directly reduce the COD of sewage, make sewage be effectively addressed.Its chemical equation is as follows
H
2O+h
+(high energy proton) → OH+H
+(1)
O
2+ e
-(high-energy electron) → O
2 -→ HO
2(2)
2HO
2·→O
2+H
2O
2 ……(3)
H
2O
2+·O
2 -→·OH+OH
-+O
2 ……(4)
From above equation (1) (4) can be acid or alkaline at Electrode reaction sewage as can be seen, in the entire sewage treating processes, just can not increase the amount of inorganic salt so again, so just shortened the flow process and the sewage disposal amount of investment of sewage disposal, the operation of sewage disposal is simultaneously also more oversimplified.
Charcoal base in the carbon-base monocrystalline silicon can produce a certain amount of oxygen under the energising situation on the charcoal base, the ionic reaction of the silicon single crystal under the existence of oxygen triggers electricity has great help.This can find out from above equation (2).
Description of drawings
Fig. 1 is technological process of production figure of the present invention.
Embodiment
Referring to Fig. 1, silicon single crystal that the present invention relates to or carbon-base monocrystalline silicon electrode electrolysis oxidation are handled method for organic chemical sewage, mainly are made up of following processing step:
The sewage that produces in the organic synthesis process concentrated place in the sewage lagoon, the residence time of sewage in sewage lagoon was controlled at more than 48 hours; Sewage in the sewage lagoon is risen to sedimentation in the settling bowl, and clear liquid enters the oxidation of electrolytic oxidation system, carries out electrolytic oxidation with silicon single crystal as electrode, oxidization time 1～10 hour, oxidation current density 5～20mA/cm
2Electrolysis finishes the back owing to contain more chlorion and ammonium ion etc. in some sewage, by changing the pH value of sewage after the electrolysis, some organism in the sewage can become micromolecular organic acid after electrolysis in addition, pH value to sewage is also influential, but biochemical have requirement to pH, so electrolytic sewage must be adjusted it after handling, to help the biochemical treatment of sewage.
Embodiment 1: the sewage disposal of o-Nitrophenyl methyl ether
Former aqueous condition: this COD of sewage 〉=25000mg/l, pH 〉=14, yellow liquid.
Sewage treatment process: sewage is concentrated, aeration, sedimentation, electrolytic oxidation, sand filtration, water outlet.
Treating processes explanation: contain more organic compound in this sewage, sewage directly entered the electrolytic oxidation system after throw out was removed in aeration, sedimentation, because the nitrobenzene-containing material is more in this sewage, so, the pH value can reach about 8 substantially after the electrolytic sewage water outlet, so just needn't adjust the pH value of sewage.
Sewage disposal result: COD≤2500mg/l after the sewage disposal, water white transparency.
Embodiment 2: the sewage disposal of p-Nitroaniline mother liquor
Sewage situation: COD 〉=20000mg/l, Vandyke brown translucent liquid, nitro thing 〉=2000mg/l, aniline thing 〉=2000mg/l, ammonium chloride 〉=12%, free ammonia 〉=8%.
Sewage treatment process: sewage is concentrated, sewage condensation, press filtration, filtrate, electrolytic oxidation, sand filtration, recovery ammonium chloride.
Sewage treatment process explanation: contain a large amount of organism and inorganic ammonium chloride in the sewage, reclaim ammonium chloride so should consider the comprehensive utilization of sewage during the design sewage disposal, at first sewage carries out condensation and removes a part of organism, press filtration filtrate is directly carried out electrolytic oxidation, the sand filtration rear filtrate transparent liquid that becomes colorless, this solution directly removes to reclaim ammonium chloride, and the ammonium chloride that can obtain white obtains the regeneration of resource.
Claims (1)
1, a kind of silicon single crystal or carbon-base monocrystalline silicon electrode electrolysis oxidation are handled method for organic chemical sewage, it is characterized in that described method mainly comprises following processing step:
1), sewage is concentrated
The sewage that produces in organic chemical industry's production process concentrated place in the sewage lagoon, the residence time of sewage in sewage lagoon was controlled at more than 48 hours,
2), sedimentation
Sewage in the sewage lagoon is fed the settling bowl sedimentation,
3), electrolytic oxidation
Sewage is removed mud after sedimentation, carry out electrolytic oxidation with silicon single crystal or carbon-base monocrystalline silicon as electrode, oxidization time 1～10 hour, oxidation current density 5～20mA/cm
2,
Described carbon-base monocrystalline silicon is that monocrystalline silicon piece is sticked to the charcoal primary surface.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810023591A CN100591630C (en) | 2008-04-09 | 2008-04-09 | Monocrystalline silicon or carbon-base monocrystalline silicon electrode electrolysis oxidation treatment method for organic chemical sewage |
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|---|---|---|---|
| CN200810023591A CN100591630C (en) | 2008-04-09 | 2008-04-09 | Monocrystalline silicon or carbon-base monocrystalline silicon electrode electrolysis oxidation treatment method for organic chemical sewage |
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| CN101264957A CN101264957A (en) | 2008-09-17 |
| CN100591630C true CN100591630C (en) | 2010-02-24 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103359862A (en) * | 2012-03-28 | 2013-10-23 | 杜惠红 | Process and system for treating nitrochlorobenzene ammonolysis wastewater |
| CN104828912A (en) * | 2015-04-22 | 2015-08-12 | 南京水思环保科技有限公司 | Method for treating straight chain-substituted nitrile compound-containing industrial sewage by micro-current electrolysis method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1336334A (en) * | 2001-09-20 | 2002-02-20 | 上海交通大学 | Diamond coating electrode method for treating hard-to-degrade waste water |
| CN1673103A (en) * | 2005-03-24 | 2005-09-28 | 浙江大学 | Pulse liquid phase plasma power supply unit for waste water treatment |
| CN1760139A (en) * | 2005-09-01 | 2006-04-19 | 太原理工大学 | Technique for treating organic substance difficukt to be degradated in water through opto-electronic electrode |
| CN2832800Y (en) * | 2004-06-23 | 2006-11-01 | 大连理工大学 | Device for photo-catalytic treatment of organic wastewater induced by needle-board type pulse discharge plasma |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1336334A (en) * | 2001-09-20 | 2002-02-20 | 上海交通大学 | Diamond coating electrode method for treating hard-to-degrade waste water |
| CN2832800Y (en) * | 2004-06-23 | 2006-11-01 | 大连理工大学 | Device for photo-catalytic treatment of organic wastewater induced by needle-board type pulse discharge plasma |
| CN1673103A (en) * | 2005-03-24 | 2005-09-28 | 浙江大学 | Pulse liquid phase plasma power supply unit for waste water treatment |
| CN1760139A (en) * | 2005-09-01 | 2006-04-19 | 太原理工大学 | Technique for treating organic substance difficukt to be degradated in water through opto-electronic electrode |
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