CN202519114U - Combined treatment device for chemical oxygen demand (COD) in polychlorinated biphenyl (PCB) waste water - Google Patents
Combined treatment device for chemical oxygen demand (COD) in polychlorinated biphenyl (PCB) waste water Download PDFInfo
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- CN202519114U CN202519114U CN2012201557254U CN201220155725U CN202519114U CN 202519114 U CN202519114 U CN 202519114U CN 2012201557254 U CN2012201557254 U CN 2012201557254U CN 201220155725 U CN201220155725 U CN 201220155725U CN 202519114 U CN202519114 U CN 202519114U
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Abstract
The utility model relates to a combined treatment device for eliminating chemical oxygen demand (COD) in polychlorinated biphenyl (PCB) waste water, and is used for treatment of high-concentration organic waste water with heavy metal. The combined treatment device for the COD in the PCB waste water comprises the following units, including an iron-carbon pond, a Fenton pond, a coagulation pond, and a settling pond, wherein the top end of the iron-carbon pond is provided with a water inlet and a potential of hydrogen (pH) automatic adjustment device to adjust inlet water to be acid, and the bottom of the iron-carbon pond is provided with an aerating system. A water inlet of the Fenton pond is provided with an automatic drug-dosing device to add hydrogen peroxide, and the bottom of the Fenton pond is provided with an aerating system. A water inlet of the coagulation pond is provided with a pH automatic adjustment device to adjust inlet water to be alkali, and the water inlet of the coagulation pond is further provided with an automatic drug-dosing device to add coagulants. The bottom of the settling pond is provided with a mud outlet. The combined treatment device for the COD in the PCB waste water has the advantages that due to the facts that pH of the Fenton pond does not need to be adjusted, and ferrous ions do not need to be added exteriorly, cost is saved, the high-concentration organic waste water like printing and dyeing wastewater and the PCB waste water can be degraded rapidly and efficiently, and the degree of automation is high.
Description
Technical field
The utility model relates to sewage treatment area, particularly COD process field in the sewage.
Background technology
Can produce the COD organic waste water that contains heavy metal ion and high-concentration hardly-degradable in the industry production such as printed circuit board, plating, five metals processing, leather, enter rivers and will cause serious environmental to pollute, and then cause water resources to lack and the quality of water environment deterioration.For the normal method that adopts of organic wastewater with difficult degradation thereby (1) wet oxidation process, (2) evaporation afterfire method, (3) anaerobic biological treatment method are arranged.Wherein preceding two kinds of method facility investments are big, and technical requirements is high, and energy consumption is also big, and the third method floor space is big, and the residence time is long and be easy to generate peculiar smell.The COD organic waste water of domestic improvement PCB adopts acidifying-aerobe to handle more; Though this kind method can be removed COD effectively; But because the microorganism growth environmental requirement is harsh, responsive to the potential of hydrogen and the heavy metal ion of former water, often improper in operational process because of red-tape operati; Cause whole biochemical system paralysis, water outlet COD severe overweight.
Summary of the invention
The utility model provide a kind of treatment time short, treatment effect good, practice thrift cost, level of automation is high, the combined apparatus of COD in the PCB waste water of convenient management.
For solving the problems of the technologies described above; The technical scheme that the utility model adopts is: the combined apparatus of COD in a kind of PCB waste water comprises following component units successively: iron carbon pond, its top are provided with water inlet and pH automatic-adjusting device; It is acid regulating entry, and its bottom is provided with aerating system; The Fenton pond, its water inlet is provided with automatic medicine adding apparatus, adds ydrogen peroxide 50, and its bottom is provided with aerating system; Coagulation basin, its water inlet is equipped with the pH automatic-adjusting device, and regulating entry is alkalescence, and water inlet also is provided with automatic medicine adding apparatus, adds coagulating agent; Settling tank, the bottom is provided with mud discharging mouth.
Further, be provided with swash plate in the said settling tank.
Further, be provided with whipping appts in the said coagulation basin.
Compared with prior art, beneficial effect is:
1, this apparatus processes high concentrated organic wastewater required time is short, and treatment effect is good.Sewage installs and is about 8h effusive mean time from getting into this, and the treatment time is short, so strong shock resistance.The equal degradable larger molecular organics of iron-carbon micro-electrolysis and Fenton advanced oxidation passes through coagulating sedimentation afterwards again, and organic removal rate is high, and water outlet is limpid, and water quality is good.
2, this plant automation degree is high, makes things convenient for operational management.Because this device is provided with automatic medicament feeding system, the pH varitrol, therefore aerating system under the stable situation of intaking, can realize whole automatic flows, only notes regular spoil disposal and add iron-carbon filling material to get final product, operational management is very convenient.
3, because of reaction required pH in iron carbon pond is lower, between 1 ~ 2, and the Fenton pond required pH of reaction is between 2 ~ 3; And the pH through iron-carbon micro-electrolysis reaction back solution can slightly raise; Be approximately 2 ~ 3, therefore the Fenton pond need not to regulate pH, can make things convenient for installation and operation.
4, because of iron-carbon micro-electrolysis reaction can produce a large amount of ferrous ions, get into the Fenton pond, can provide Fenton's reaction required ferrous ion, so the Fenton pond need not external interpolation and contain the ferrous material, be convenient to operation and practice thrift cost with current.
5, all there is aerating system in iron carbon pond and Fenton pond, make the solution oxygen level at 1.5 ~ 2mg/L, both can promote the electrode reaction in iron carbon pond; Can promote the oxidizing reaction in Fenton pond again; Simultaneously can also play the effect that mixes, so that solution mixes, reaction thoroughly.
6, iron-carbon micro-electrolysis reaction can be removed heavy metal ion, and larger molecular organics that can the many difficult degradations of oxygenolysis, and Fenton's reaction can generate the extremely strong O radical of oxidation capacity; With organic substance generation oxidizing reaction; Make its carbochain fracture, the material of last generation is carbonic acid gas and water, thereby handles hardly degraded organic substance more up hill and dale; The coupling of two kinds of methods can be mutually promoted, and finally reaches the effect of efficient removal difficult degradation pollutent.
Description of drawings
Fig. 1 is the structural representation of the utility model;
Fig. 2 is the structural representation of the preferred embodiment of the utility model;
Wherein: 1, iron carbon pond; 2, the Fenton pond; 3, coagulation basin; 4, settling tank; 5, the iron carbon filler; 6, aerating system; 7, PH automatic-adjusting device one; 8, PH automatic-adjusting device two; 9, automatic medicine adding apparatus one; 10, automatic medicine adding apparatus two; 11, whipping appts; 12, swash plate.
Embodiment
Accompanying drawing 1 is the preferred embodiment of the utility model with accompanying drawing 2, mainly comprises four parts: iron carbon pond 1, Fenton pond 2, coagulation basin 3 and settling tank 4.Novel iron-carbon filling material 5 wherein is housed in the iron carbon pond 1, and it enters the mouth on the top, pond, and pH automatic-adjusting device 1 is equipped with in the ingress, serves as acid and stable to guarantee entry pH, and the bottom is equipped with aerating system 6 and is promoted reaction so that oxygen to be provided; Fenton pond 2 water inlets are provided with automatic medicine adding apparatus 1, add ydrogen peroxide 50, and its bottom is provided with aerating system 6 to promote reaction; It is that alkalescence is convenient to flocculation sediment to regulate water that coagulation basin 3 inlet is equipped with pH automatic-adjusting device 28, also is provided with automatic medicine adding apparatus 2 10, dosing coagulant, and there is whipping appts 11 inside, is beneficial to the formation and the cohesion of flco; Be provided with swash plate 12 in the settling tank 4, to improve the mud-water separation effect, final clear water is discharged by the upper end riser, and mud is regularly discharged via the bottom mud discharging mouth.
The working process of the utility model is following: waste water is via water pump suction iron carbon pond 1; Get into system from the ingress, top, regulate entry pH between 1 ~ 2 through pH automatic-adjusting device 1, iron-carbon filling material 5 and waste water generation micro-electrolysis reaction; Degraded pollutent and heavy metal ion wherein; The residence time is approximately 40 ~ 50min, so that an amount of oxygen to be provided, strengthens little electrolysis effectiveness by aerating system 6 aerations.Get into Fenton pond 2 afterwards, because of the pH Fenton pond appropriate pH that slightly raises in iron-carbon micro-electrolysis reaction back just is 2 ~ 3, so the Fenton pond need not to regulate pH; Can bring enough ferrous ions into because of iron carbon pond 1 again; Therefore Fenton pond 2 need not to add ferrous ion, only need add an amount of ydrogen peroxide 50, and the residence time is about 2h; Aeration mixes with promotes oxidn reaction and assurance, further removes remaining hardly degraded organic substance through the Fenton advanced oxidation.Get into coagulation basin 3 afterwards, with between pH regulator to 8 ~ 9, the ferrous and ferric ions precipitation in the water forms flco through pH automatic-adjusting device 28; Dosing coagulant is assembled little flco and is united to form big flocculating body again; Get into ramp type settling tank 4 depositions afterwards, mud-water separation is respond well, and the top clear water flows out through riser; Detect back up to standard discharging, mud is discharged by the bottom mud discharging mouth.
Wherein, the electrolysis material of iron-carbon micro-electrolysis technology generally adopts cast iron filing and gac or coke, when material is immersed in the acid waste water, the electrolytic reaction of inside and outside two aspects takes place.Contain the iron carbide of trace on the one hand in the cast iron, iron carbide and pure iron exist tangible redox-potential poor, have just formed many trickle galvanic cells like this in cast iron filing inside, and pure iron is as the anode of galvanic cell, and iron carbide is as the negative electrode of galvanic cell; In addition; Cast iron filing has formed bigger galvanic cell again with its powdered carbon on every side; Therefore the process of utilizing little electrolysis to carry out wastewater treatment is actually inside and outside dual electrolytic process; Perhaps be referred to as to exist the reaction of microcosmic and macroscopic galvanic cell, galvanic corrosion has simultaneously caused a series of related synergies again, thus iron charcoal micro-electrolysis method be flocculation, absorption, build bridge, the result of multiple effect combined effects such as volume is swept, sink altogether, galvanic deposit, electrochemical reduction.Its electrode reaction is following:
Anode: Fe-2e-→ Fe2+ E (Fe/Fe2+)=-0.44V
Negative electrode: under
neutrality or the alkaline condition: O2+2H2O+4e-→ 4OH-E (O2/OH-)=0.40V
Under
acidic conditions: 2H++2e-→ 2 [H] → H2 E (H+/H2)=0V
Under
rich acidic oxygen condition: 4H++O2+4e-→ 2H2O E (O2)=1.23V
Can find out that under the rich acidic oxygen condition, potential difference is maximum, corrosion reaction is the fastest, and promptly treatment effect is best.Therefore pH need be controlled for acid in the utility model iron carbon pond, and aeration promotes micro-electrolysis reaction so that oxygen to be provided.
Fenton reagent oxidation method has original advantage to being difficult to the material that biological degradation or general chemical oxidation treatment can't resolve aspect Industrial Wastewater Treatment.Its mechanism of action is:
Fe
2+Very fast with hydroperoxidation, generate the extremely strong O radical of oxidation capacity, with organic substance generation oxidizing reaction, make its carbochain fracture, the material of last generation is carbonic acid gas and water, thereby reaches the purpose of handling organic sewage more up hill and dale.Heavy dose of Fenton reagent can make the polymkeric substance of phenol further change into CO2, thereby reaches the purpose of purifying liquid waste.For aromatics, OH can destroy aromatic nucleus, forms fatty compounds, thereby eliminates the bio-toxicity of aromatics, improves the biodegradability of waste water.For dyestuff, OH can the directtissima chromophoric group, opens the unsaturated link(age) of dyestuff color development functional group, makes the dyestuff oxygenolysis, reaches simultaneously waste water is decoloured and reduces the purpose of COD.In addition, for some water soluble organic substance (naphthalene like the band sulfonic acid group is an organism), OH can react with it, changes its cloud density and structure, reduces that it is water-soluble, helps adopting the method for coagulation or absorption that it is removed.
Both couplings make the organism decomposing oxidation of difficult degradation in the waste water by little electrolytic oxidation of iron charcoal and the acting in conjunction of Fenton free-radical oxidn, generate carbonic acid gas, water and other inorganicss.
Introduce two instances below:
Instance one: the organic waste water of certain PCB factory, after its acidulated pool acidifying, get into this device, the entry color is blue-greenish colour, and pH is about 1 ~ 2, and institute's metal ion is mainly cupric ion, and COD is about 2500 ~ 3000 mg/L.Waste water extracts to iron carbon pond 1 via water pump, and flow is 3m
3/ h.Because waste water acidifying, so pH regulator device 1 is mainly used in the monitoring iron carbon pond liquid pH and stablizes and meet the requirements.Aerating system 6 aerations make the solution oxygen level at 1.5 ~ 2mg/L so that air to be provided in the pond, promote the iron-carbon micro-electrolysis reaction; Through reaction; Metals ions such as cupric ion can be broken away from waste water by displacement, and pollutents such as larger molecular organics also can be produced ferrous ion by a reaction and a degraded part simultaneously; PH slightly raises, and the residence time is about 40 ~ 50min.Flow into Fenton pond 2 afterwards, get final product, so one 9 need of chemicals dosing plant add ydrogen peroxide 50 and get final product because of pH and ferrous ion need not to regulate to be provided by iron carbon pond 1; In this embodiment, dosage is 167mL/min 50%H2O2, is mixed with assurance by aerating system 6 aerations; React through the Fenton advanced oxidation; Remaining pollutent can be degraded in the waste water, and COD reduces greatly, and the residence time is about 2h.Get into coagulation basin 3 afterwards; It is 8 ~ 9 that inlet is regulated pH automatically by pH regulator device 28, so contained iron ion and ferrous ion can form flco in the water, adds the coagulating agent PAM of 10ppm again at inlet; Dosage is 208mL/min; To promote little flco to be condensed into big flocculating body, the whipping appts 11 in the pond promotes coagulation effect through stirring, and the residence time is approximately 1h.Flow into settling tank 4 at last, swash plate 12 can promote the mud-water separation effect, and mud is accumulated in the bottom, is discharged by the bottom mud discharging mouth, and clear water is flowed out by the top riser, and water outlet COD is lower, and clear, colorless is tasteless.Choose several groups of test results, see the following form.
Table 1 instance one test data
Instance two: certain PCB factory water after treatment, the transparent free from extraneous odour of entry color, pH is about 7 ~ 8, and COD is about 300 ~ 400 mg/L.Waste water extracts to iron carbon pond 1 via water pump, and flow is 3m
3/ h.Automatically regulate entry pH between 1 ~ 2 by pH regulator device 1, aerating system 6 aerations promote the iron-carbon micro-electrolysis reaction so that air to be provided in the pond; Through reaction; Metals ion can be broken away from waste water by displacement, and pollutents such as larger molecular organics also can be produced ferrous ion by a reaction and a degraded part simultaneously; PH slightly raises, and the residence time is about 40 ~ 50min.Flow into Fenton pond 2 afterwards, get final product because of pH and ferrous ion need not to regulate to be provided by iron carbon pond 1, so one 9 need of chemicals dosing plant add ydrogen peroxide 50 and get final product, in this embodiment, dosage is 104mL/min 50%H
2O
2, mix with assurance by aerating system 6 aerations, through the reaction of Fenton advanced oxidation, remaining pollutent can be degraded in the waste water, and COD reduces greatly, and the residence time is about 2h.Get into coagulation basin 3 afterwards; It is 8 ~ 9 that inlet is regulated pH automatically by pH regulator device 28, so contained iron ion and ferrous ion can form flco in the water, adds the coagulating agent PAM of 10ppm again at inlet; Dosage is 208mL/min; To promote little flco to be condensed into big flocculating body, the whipping appts 11 in the pond promotes coagulation effect through stirring, and the residence time is approximately 1h.Flow into settling tank 4 at last, swash plate 12 can promote the mud-water separation effect, and mud is accumulated in the bottom, is discharged by the bottom mud discharging mouth, and clear water is flowed out by the top riser, and water outlet COD is lower, and clear, colorless is tasteless.Choose several groups of test results, see the following form.
Table 2 instance two test datas
Claims (4)
1. the combined apparatus of COD in the PCB waste water is characterized in that, comprises following component units successively:
Iron carbon pond, its top are provided with water inlet and pH automatic-adjusting device, and it is acid regulating entry, and its bottom is provided with aerating system;
The Fenton pond, its water inlet is provided with automatic medicine adding apparatus, adds ydrogen peroxide 50, and its bottom is provided with aerating system;
Coagulation basin, its water inlet is equipped with the pH automatic-adjusting device, and regulating entry is alkalescence, and water inlet also is provided with automatic medicine adding apparatus, adds coagulating agent;
Settling tank, the bottom is provided with mud discharging mouth.
2. combined apparatus according to claim 1 is characterized in that, said iron carbon pond and bottom, Fenton pond are provided with aerating system.
3. combined apparatus according to claim 1 is characterized in that, is provided with swash plate in the said settling tank.
4. combined apparatus according to claim 1 is characterized in that, is provided with whipping appts in the said coagulation basin.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201557254U CN202519114U (en) | 2012-04-13 | 2012-04-13 | Combined treatment device for chemical oxygen demand (COD) in polychlorinated biphenyl (PCB) waste water |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201557254U CN202519114U (en) | 2012-04-13 | 2012-04-13 | Combined treatment device for chemical oxygen demand (COD) in polychlorinated biphenyl (PCB) waste water |
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| CN104250055A (en) * | 2013-06-28 | 2014-12-31 | 中国石油化工股份有限公司 | Up-to-standard processing method of ethene waste lye |
| CN105540959A (en) * | 2016-02-05 | 2016-05-04 | 蓝星环境工程有限公司 | Reactor integrating microelectrolysis and Fenton technology and wastewater treatment method |
| CN105709755A (en) * | 2016-03-22 | 2016-06-29 | 浙江清华长三角研究院 | Biological carbon catalyst, iron carbon catalyst and application of biological carbon catalyst |
| CN105819596A (en) * | 2016-03-31 | 2016-08-03 | 广州绿日环保科技有限公司 | Device and method for treating wastewater by polybasic coal-iron-carbon |
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