CN105174549B - A kind of method of advanced treating wastewater containing phenol and cyanide - Google Patents
A kind of method of advanced treating wastewater containing phenol and cyanide Download PDFInfo
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- CN105174549B CN105174549B CN201510625617.7A CN201510625617A CN105174549B CN 105174549 B CN105174549 B CN 105174549B CN 201510625617 A CN201510625617 A CN 201510625617A CN 105174549 B CN105174549 B CN 105174549B
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Abstract
The present invention relates to a kind of method of advanced treating wastewater containing phenol and cyanide, its processing step is first to put into photocatalytic oxidation pool wastewater containing phenol and cyanide and H is added into pond2O2, while add it is appropriate contain ferron, then placed again under ultraviolet illumination；Again by step（1）In wastewater containing phenol and cyanide be transported in multi-effect adsorption pond and add appropriate adsorbent, utilize the ferron that contains in wastewater containing phenol and cyanide, promote absorption of the adsorbent to remaining COD, especially colourity, cyanide in water；Again by step（2）The middle wastewater containing phenol and cyanide adsorbed is transported in sedimentation basin and wastewater containing phenol and cyanide is handled using solid-liquid separation technique, and remaining COD, colourity and the cyanide and wastewater containing phenol and cyanide for making adsorbent and adsorbing carry out separation of solid and liquid；PH adjusting agent and auxiliary flocculant are added to wastewater containing phenol and cyanide again, treated wastewater containing phenol and cyanide is sent between press filtration；Solid-liquid separation technique is finally used, the wastewater containing phenol and cyanide in press filtration is handled, is separated from the water iron content filter residue, filtrate then enters clear water reserviors.Have the characteristics that technique is simple, economic and environment-friendly, cost is cheap.
Description
Technical field
The invention belongs to environment-protective process technical field, is related to a kind of method of advanced treating wastewater containing phenol and cyanide.
Background technology
For wastewater containing phenol and cyanide after biochemical treatment, COD, colourity, cyanide etc. often can't be up to standard.Currently in order to reach
Recycle water standard, many wastewater containing phenol and cyanide factories add the method for counter-infiltration using ultrafiltration, however this method no matter construction cost,
Running cost or maintenance cost, cost are all too high.In order to solve the problems, such as that bi-membrane method is costly, it is necessary to design it is a kind of simple,
Economic wastewater containing phenol and cyanide advanced treatment process.
The Liu Jinquan of Beijing Sang De pro-environment groups research and development centre have studied with ozone, H2O2/ O3And UV/O3Deng advanced oxidation
Method advanced treatment on coking wastewater, utilizes H2O2And O3Hydroxyl radical free radical is produced in water to carry out the difficult degradation COD in wastewater containing phenol and cyanide
Oxidation, it is 40min in time of contact, pH 8.5, when reaction temperature is 25 °C, three kinds of methods are to COD clearance all 45%
Left and right, but colourity and the removal problem of cyanide are not discussed in its text.The petrel perhaps of Tongji University have studied Fenton-coagulation and urge
Change oxidative treatment coking chemical waste water, its result of study shows that in ferrous iron concentration be 140mg/L, hydrogen peroxide concentration 200mg/L, chlorine
Change concentration of iron is 26mg/L, when PAM concentration is 5.2mg/L, CODcrClearance reaches 87.3%, and chroma removal rate reaches 99.45%.
The COD of processing water is 43.2mg/L, and colourity is 45 times, CN-Concentration be 1.02mg/L.In terms of data result, its COD processing reaches
To recycle water standard, colourity and cyanide are below standard.The Lu Jianhang of Institute of Environmental Science of Zhejiang University have studied coking and give up
Water coagulant special is to the COD in waste waterCr, colourity, F-And CN-Removal effect.As a result show that in dosage be 300mg/L,
Under conditions of pH value is 6~6.5, coagulant special has good removal effect to each pollutant, and COD drops to from 250mg/L
50mg/L, colourity drop to 75 times from 1500 times, F-1mg/L is dropped to from 20mg/L, total cyanogen drops to 0.34mg/L from 2.3mg/L.By
Higher in discharge standard value at that time, the discharge standard of total cyanogen is 0.5mg/L, and present discharge standard is 0.2mg/L, and
The reuse standard of colourity is 30 times, therefore this method can not still meet current reuse requirement.
The content of the invention
To overcome above-mentioned technical disadvantages, the present invention provides a kind of method of advanced treating wastewater containing phenol and cyanide, and it can be by phenol
COD in cyanogen waste waterCr, colourity, total cyanogen be brought down below 60mg/L, 30 times, 0.2mg/L simultaneously, have that technique is simple, economic ring
Protect, the features such as cost is cheap.
Technical method is used by the present invention solves its technical problem：A kind of method of advanced treating wastewater containing phenol and cyanide, its
Being characterised by processing step is：
（1）The photochemical catalytic oxidation stage：Wastewater containing phenol and cyanide is put into photocatalytic oxidation pool and H is added into pond2O2, add simultaneously
Enter it is appropriate contain ferron, then half an hour is placed under ultraviolet illumination again, so as to which the cyanide in cyanide wastewater be down to
1mg/L to 10mg/L；
（2）Ferrous iron promotees absorption phase：By step（1）In wastewater containing phenol and cyanide be transported in multi-effect adsorption pond and add appropriate
Adsorbent, using the ferron that contains in wastewater containing phenol and cyanide, promote suction of the adsorbent to remaining COD, especially colourity, cyanide in water
It is attached；
（3）The separation of solid and liquid first stage：By step（2）The middle wastewater containing phenol and cyanide adsorbed is transported in sedimentation basin and using solid
Liquid isolation technics is handled wastewater containing phenol and cyanide, remaining COD, colourity and the cyanide and wastewater containing phenol and cyanide for making adsorbent and adsorbing
Separation of solid and liquid is carried out, adsorbent and the remaining COD, colourity and the cyanide that adsorb are sent between press filtration and carry out adsorbent recovery,
Wastewater containing phenol and cyanide is then sent into PH regulating reservoirs and continued with；
（4）Yu Tie removes the stage：Wastewater containing phenol and cyanide into PH regulating reservoirs adds pH adjusting agent and auxiliary flocculant, by water
Residue is removed containing iron ion from water, and treated wastewater containing phenol and cyanide is sent between press filtration；
（5）Separation of solid and liquid second stage：Using solid-liquid separation technique, the wastewater containing phenol and cyanide in press filtration is handled, made
Iron content filter residue is separated from the water, and filtrate then enters clear water reserviors, and filter residue then recycles, and the COD in filtrate is down to 60mg/
Below L, colourity are down to less than 30 times, and cyanide is down to below 0.2mg/L.
The beneficial effects of the invention are as follows：（1）Handled using pollutant concentration classification, high pollution thing Concentration portion is urged using light
Change oxidation technology, by CODCrBelow 100mg/L is dropped to, total cyanogen is down to below 10mg/L；（2）Processing in low concentration part,
Using Coupling Adsorption sedimentation, acted synergistically using the remaining iron of front end photochemical catalytic oxidation together with adsorbent, to CODCrWith
Total cyanogen carries out adsorption treatment, COD is down into less than 60, total cyanogen drops to 0.3mg/L or so；（3）PH adjusting agent is added, on the one hand will
Remaining iron ion is precipitated in the form of iron hydroxide and molysite in water, reduces the concentration of salt in water；On the other hand profit
With the coagulation of precipitation, COD, colourity and the total cyanogen further gone in water removal, reuse standard is reached.With technique letter
The features such as single, economic and environment-friendly, cost is cheap.
Brief description of the drawings
Fig. 1 is implementation process schematic diagram of the present invention.
Embodiment
With reference to embodiment, the present invention is further described.
Referring to Fig. 1, a kind of method of advanced treating wastewater containing phenol and cyanide, it is characterised in that processing step is：
（1）The photochemical catalytic oxidation stage：Wastewater containing phenol and cyanide is put into photocatalytic oxidation pool and H is added into pond2O2, add simultaneously
Enter it is appropriate contain ferron, then half an hour is placed under ultraviolet illumination again, so as to which the cyanide in cyanide wastewater be down to
1mg/L to 10mg/L；
（2）Ferrous iron promotees absorption phase：By step（1）In wastewater containing phenol and cyanide be transported in multi-effect adsorption pond and add appropriate
Adsorbent, using the ferron that contains in wastewater containing phenol and cyanide, promote suction of the adsorbent to remaining COD, especially colourity, cyanide in water
It is attached；
（3）The separation of solid and liquid first stage：By step（2）The middle wastewater containing phenol and cyanide adsorbed is transported in sedimentation basin and using solid
Liquid isolation technics is handled wastewater containing phenol and cyanide, remaining COD, colourity and the cyanide and wastewater containing phenol and cyanide for making adsorbent and adsorbing
Separation of solid and liquid is carried out, adsorbent and the remaining COD, colourity and the cyanide that adsorb are sent between press filtration and carry out adsorbent recovery,
Wastewater containing phenol and cyanide is then sent into PH regulating reservoirs and continued with；
（4）Yu Tie removes the stage：Wastewater containing phenol and cyanide into PH regulating reservoirs adds pH adjusting agent and auxiliary flocculant, by water
Residue is removed containing iron ion from water, and treated wastewater containing phenol and cyanide is sent between press filtration；
（5）Separation of solid and liquid second stage：Using solid-liquid separation technique, the wastewater containing phenol and cyanide in press filtration is handled, made
Iron content filter residue is separated from the water, and filtrate then enters clear water reserviors, and filter residue then recycles, and the COD in filtrate is down to 60mg/
Below L, colourity are down to less than 30 times, and cyanide is down to below 0.2mg/L.
Embodiment 1：
If the COD of raw waterCrFor 150mg/L, total cyanogen 15mg/L, colourity is 3000 times.
（1）Photochemical catalytic oxidation section：By H2O2Add in waste water, and add a certain amount of ferrous sulfate, ultraviolet lighting half is small
When, now carry out following reaction：
（1）
（2）
Hydrogen peroxide produces substantial amounts of hydroxyl radical free radical under the catalytic action of ultraviolet light and ferrous ion, and hydroxyl free
Base has extremely strong oxidation, can cross the oxidation operation in waste water, by CODCrBelow 100mg/L is down to, by cyanide
It is down to 2mg/L.
（2）Ferrous iron promotees adsorption section：It is on the one hand ferrous in the remaining a part of ferrous ion of photochemical catalytic oxidation section meeting and iron ion
Ion can form Prussian blue with cryanide ion, and Prussian blue compared with cryanide ion, molecular weight is big 10 times, and carried charge is big by 2
Times, therefore it is easier adsorbed and precipitation.On the other hand, the iron ion in water can form ferric hydroxide precipitate, produce flocculation
Effect.By adding a certain amount activated carbon, using the ferrous ion and iron ion in waste water, promote activated carbon to remaining in water
COD, especially colourity, cyanide absorption.
（3）One section of separation of solid and liquid：Activated carbon has preferable sedimentation capacity, and adsorption section draining is consolidated using sedimentation basin
Liquid separates, and the activated carbon of settling zone further carries out dehydration separation with filter press, because activated carbon price is of a relatively high, and can be with
Reactivation, therefore can be by the activated carbon reuse after separation of solid and liquid.
（4）Yu Tie removes section：This section is located at the pH regulating reservoirs in Fig. 1, because waste water is after active carbon adsorption, also contains
Substantial amounts of ferrous ion, ferrous ion can react in water with the dissolved oxygen in water, raw in brown iron ion.For iron more than removal,
A certain amount of CaO is added, pH is adjusted to alkalescent, remaining iron is removed.
（5）Two sections of separation of solid and liquid：Using solid-liquid separation technique, iron content sediment is separated from the water.Most COD is down at last
Below 60mg/L, colourity are down to less than 30 times, and cyanide is down to below 0.2mg/L.
From embodiment it can be seen that COD, colourity and total cyanogen that the present invention can be further gone in water removal, are reached back
With standard, have the characteristics that technique is simple, economic and environment-friendly, cost is cheap.
Claims (1)
- A kind of 1. method of advanced treating wastewater containing phenol and cyanide, it is characterised in that processing step is：（1）The photochemical catalytic oxidation stage：Wastewater containing phenol and cyanide is put into photocatalytic oxidation pool and H is added into pond2O2, while add suitable Amount contains ferron, then places half an hour under ultraviolet illumination again, so as to which the cyanide in cyanide wastewater is down into 1mg/L To 10mg/L；（2）Ferrous iron promotees absorption phase：By step（1）In wastewater containing phenol and cyanide be transported in multi-effect adsorption pond and add appropriate absorption Agent, using the ferron that contains in wastewater containing phenol and cyanide, promote absorption of the adsorbent to remaining COD, especially colourity, cyanide in water；（3）The separation of solid and liquid first stage：By step（2）The middle wastewater containing phenol and cyanide adsorbed is transported in sedimentation basin and using solid-liquid point Wastewater containing phenol and cyanide is handled from technology, remaining COD, colourity and the cyanide and wastewater containing phenol and cyanide for making adsorbent and adsorbing are carried out Separation of solid and liquid, adsorbent and the remaining COD, colourity and the cyanide that adsorb are sent between press filtration and carry out adsorbent recovery, by phenol Cyanogen waste water is then sent into PH regulating reservoirs and continued with；（4）Yu Tie removes the stage：Wastewater containing phenol and cyanide into PH regulating reservoirs adds pH adjusting agent and auxiliary flocculant, will be remaining in water Removed containing iron ion from water, and treated wastewater containing phenol and cyanide is sent between press filtration；（5）Separation of solid and liquid second stage：Using solid-liquid separation technique, the wastewater containing phenol and cyanide in press filtration is handled, makes iron content Filter residue is separated from the water, and filtrate then enters clear water reserviors, and filter residue then recycles, finally make the COD in filtrate be down to 60mg/L with Under, colourity is down to less than 30 times, and cyanide is down to below 0.2mg/L.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5359685B2 (en) * | 2009-08-25 | 2013-12-04 | 富士ゼロックス株式会社 | Water treatment apparatus and water treatment method used in toner manufacturing process |
| CN103755077A (en) * | 2014-02-10 | 2014-04-30 | 吉林大学 | Phenolic wastewater treatment method |
| CN104045195A (en) * | 2014-07-07 | 2014-09-17 | 新疆维吾尔自治区环境保护科学研究院 | Pre-treatment method of semi-coke wastewater |
| CN204607770U (en) * | 2015-03-30 | 2015-09-02 | 西安科技大学 | A kind of DYE PRODUCTION oxidation pond concentrates the treatment unit of waste water |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011050900A (en) * | 2009-09-03 | 2011-03-17 | Fuji Xerox Co Ltd | Water treatment apparatus and water treatment method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5359685B2 (en) * | 2009-08-25 | 2013-12-04 | 富士ゼロックス株式会社 | Water treatment apparatus and water treatment method used in toner manufacturing process |
| CN103755077A (en) * | 2014-02-10 | 2014-04-30 | 吉林大学 | Phenolic wastewater treatment method |
| CN104045195A (en) * | 2014-07-07 | 2014-09-17 | 新疆维吾尔自治区环境保护科学研究院 | Pre-treatment method of semi-coke wastewater |
| CN204607770U (en) * | 2015-03-30 | 2015-09-02 | 西安科技大学 | A kind of DYE PRODUCTION oxidation pond concentrates the treatment unit of waste water |
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