CN109279724A - A kind of PCB industry wastewater treatment method - Google Patents

A kind of PCB industry wastewater treatment method Download PDF

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Publication number
CN109279724A
CN109279724A CN201710603365.7A CN201710603365A CN109279724A CN 109279724 A CN109279724 A CN 109279724A CN 201710603365 A CN201710603365 A CN 201710603365A CN 109279724 A CN109279724 A CN 109279724A
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water
pond
water inlet
fenton
iron
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CN201710603365.7A
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周尧
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46176—Galvanic cells
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5281—Installations for water purification using chemical agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/56—Macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/722—Oxidation by peroxides
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F2001/007—Processes including a sedimentation step
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/02—Specific form of oxidant
    • C02F2305/026—Fenton's reagent

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

A kind of PCB industry wastewater treatment method, characterized in that waste water successively passes through consisting of unit: iron carbon pond, and top is equipped with water inlet and pH self-checking device, and adjusting into water is acidity, and its bottom is equipped with aeration method；Fenton pond, water inlet are equipped with automatic medicine adding apparatus, hydrogen peroxide are added, and its bottom is equipped with aeration method；Coagulating basin, water inlet are equipped with pH self-checking device, and adjusting into water is alkalinity, and water inlet is additionally provided with automatic medicine adding apparatus, and coagulant is added；Sedimentation basin, bottom are equipped with mud discharging mouth.

Description

A kind of PCB industry wastewater treatment method
Technical field
The present invention relates to COD process fields in sewage treatment field, especially sewage.
Background technique
It is difficult containing heavy metal ion and high concentration to generate in the industry productions such as printed wiring board, plating, five metalworkings, leather The COD organic wastewater of degradation, serious environmental pollution will be caused by being discharged into rivers, in turn result in water resource shortage and quality of water environment Deteriorate.For organic wastewater with difficult degradation thereby frequently with method have (1) wet oxidation process, (2) evaporation after-combustion method, (3) anaerobism raw Object facture.Wherein the equipment investment of first two method is big, and technical requirements are high, and energy consumption is also big, the third method takes up a large area, and stops It stays the time long and is easy to produce peculiar smell.The COD organic wastewater that the country administers PCB mostly uses acidification-Aerobic biological process, Ci Zhongfang Although method can be effectively removed COD, since microorganism growing environment requires harshness, to the pH value and heavy metal ion of raw water Sensitivity, in the process of running often because control misoperation, causes entire biochemical method to paralyse, water outlet COD is severely exceeded.
Summary of the invention
The present invention provides a kind of short processing time, high treating effect, save the cost, high degree of automation, facilitates management PCB industry wastewater treatment method.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of PCB industry wastewater treatment method gives up Water successively passes through consisting of unit: iron carbon pond, and top is equipped with water inlet and pH self-checking device, and adjusting into water is acid Property, and its bottom is equipped with aeration method；Fenton pond, water inlet are equipped with automatic medicine adding apparatus, hydrogen peroxide are added, and its bottom is set There is aeration method；Coagulating basin, water inlet are equipped with pH self-checking device, and adjusting into water is alkalinity, and water inlet is additionally provided with automatically Coagulant is added in chemicals dosing plant；Sedimentation basin, bottom are equipped with mud discharging mouth.
Further, inclined plate is equipped in the sedimentation basin.
Further, agitating device is equipped in the coagulating basin.
Compared with prior art, beneficial effect is:
1, short, high treating effect the time required to present apparatus processing high concentrated organic wastewater.Sewage is from the present apparatus is entered to outflow Average time is about 8h, short processing time, therefore strong shock resistance.Iron-carbon micro-electrolysis and Fenton advanced oxidation are degradable big Molecular organic, later using coagulating sedimentation, organic removal rate is high, and water outlet is limpid, and water quality is good.
2, present apparatus high degree of automation facilitates operational management.Since the present apparatus is equipped with Automatic Dosing method, pH is adjusted automatically Section method, aeration method, therefore in the case where intaking stable, whole automatic flows may be implemented, only should be noted periodically Spoil disposal and addition iron-carbon filling material, operational management are very convenient.
3, because iron carbon pond reaction needed for pH it is lower, between 1 ~ 2, and Fenton pond reaction needed for pH be 2 ~ 3 between, and The pH of solution can be increased slightly after iron-carbon micro-electrolysis reacts, and about 2 ~ 3, therefore to Fenton pond without adjusting pH, it can be square Just installation and operation.
4, because iron-carbon micro-electrolysis reaction can generate a large amount of ferrous ion, enter Fenton pond with water flow, it is possible to provide Fenton is anti- Required ferrous ion is answered, therefore operation and save the cost are convenient for without external substance of the addition containing ferrous iron in Fenton pond.
5, there is aeration method in iron carbon pond and Fenton pond, make solution oxygen content in 1.5 ~ 2mg/L, can both promote iron carbon pond Electrode reaction, and the oxidation reaction in Fenton pond can be promoted, while can also play the role of being stirred, so that solution is mixed It closes uniformly, reaction is thorough.
6, iron-carbon micro-electrolysis reaction can be with heavy-metal ion removal, and can be with many macromoleculars difficult to degrade of oxygenolysis The extremely strong O free radical of oxidability can be generated in organic matter, Fenton's reaction, and oxidation reaction occurs with organic substance, makes its carbon The substance of chain fracture, last generation is carbon dioxide and water, so that hardly degraded organic substance more thoroughly is handled, two methods Combination can mutually promote, and be finally reached the effect of efficiently removal Recalcitrant chemicals.
Specific embodiment
The invention mainly comprises four parts: iron carbon pond 1, Fenton pond 2, coagulating basin 3 and sedimentation basin 4.Wherein filled in iron carbon pond 1 There is novel iron-carbon filling material 5, entrance is equipped with pH self-checking device 1 in pond top, inlet, to guarantee into water pH as acidity And stablize, bottom end provides oxygen equipped with aeration method 6 and promotes reaction；2 water inlet of Fenton pond is equipped with automatic medicine adding apparatus 1, Hydrogen peroxide is added, bottom is equipped with aeration method 6 to promote to react；3 entrance of coagulating basin is equipped with pH self-checking device 28 to adjust Water-saving to be convenient for flocculation sedimentation for alkalinity, being additionally provided with automatic medicine adding apparatus 2 10, dosing coagulant, and inside has agitating device 11, Conducive to the formation and cohesion of wadding body；Inclined plate 12 is equipped in sedimentation basin 4, to improve mud-water separation effect, final clear water is overflow by upper end Head piece discharge, sludge are periodically discharged via bottom mud discharging mouth.
The course of work of the invention is as follows: waste water is pumped into iron carbon pond 1 via water pump, and the access method from top inlet leads to It crosses pH self-checking device 1 and adjusts water pH between 1 ~ 2, micro-electrolysis reaction occurs for iron-carbon filling material 5 and waste water, and degradation is wherein Pollutant and heavy metal ion, residence time be about 40 ~ 50min, by aeration method 6 be aerated to provide suitable oxygen, Reinforce light electrolysis effect.Enter Fenton pond 2 later, Fenton pond appropriate pH is just pH due to slightly increase after iron-carbon micro-electrolysis reaction 2 ~ 3, therefore Fenton pond is not necessarily to adjust pH, and because iron carbon pond 1 can bring enough ferrous ions into, therefore Fenton pond 2 is without adding Ferrous ion only need to add appropriate hydrogen peroxide, and the residence time is about 2h, be aerated to promote oxidation reaction and guarantee to be uniformly mixed, Remaining hardly degraded organic substance is further removed by Fenton advanced oxidation.Enter coagulating basin 3 later, is automatically adjusted and filled by pH It sets 28 pH is adjusted between 8 ~ 9, the ferrous iron and ferric ions precipitation in water form wadding body, then dosing coagulant makes small wadding Body aggregation unites to form big flocculating body, enters ramp type sedimentation basin 4 later and precipitates, and mud-water separation works well, and top clear water is through overflowing Head piece outflow, detects rear discharge up to standard, and sludge is discharged by bottom mud discharging mouth.
Wherein, the electrolysis material of rail carbon micro-electrolytic processes generally uses cast-iron scrap and active carbon or coke, when material submerges When in acid waste water, inside and outside both sides cell reaction occurs.Contain micro cementite, carbon in one side cast iron Change iron and pure iron there are apparent redox potential is poor, be formed many subtle primary batteries inside cast-iron scrap in this way, Anode of the pure iron as primary battery, cathode of the cementite as primary battery；In addition, cast-iron scrap and surrounding powdered carbon form again Biggish primary battery, thus using light electrolysis carry out wastewater treatment process be actually inside and outside dual electrolysis mistake Journey, or be referred to as there are micro and macro galvanic interaction, simultaneous electrochemical corrosion has caused a series of related collaborations again Effect, thus ferric-carbon micro-electrolysis be flocculation, absorption, build bridge, volume is swept, is coprecipitated, electro-deposition, a variety of effects such as electrochemical reduction integrate The result of effect.Its electrode reaction is as follows:
Anode: Fe-2e- → Fe2+E(Fe/Fe2+)=- 0.44V
Cathode:Under neutral or alkaline condition: O2+2H2O+4e- → 4OH-E(O2/OH-)=0.40V
Under acid condition: 2H++2e- → 2 [H] → H2 E (H+/H2)=0V
Under the conditions of acidity is oxygen-enriched: 4H++O2+4e- → 2H2O E(O2)=1.23V
As can be seen that potential difference is maximum, and corrosion reaction is most fast, i.e., treatment effect is best under the conditions of acid oxygen-enriched.Therefore this hair Bright iron carbon pond need to control pH as acidity, and be aerated to provide oxygen and promote micro-electrolysis reaction.
Fenton reagent oxidizing process is in terms of Industrial Wastewater Treatment, to being difficult to biodegrade or general chemical oxidation treatment solution Substance never has the advantages that original.Its mechanism of action are as follows:
Fe2+Quickly with hydroperoxidation, the extremely strong O free radical of oxidability is generated, it is anti-that oxidation occurs with organic substance It answers, is broken its carbochain, the substance of last generation is carbon dioxide and water, more thoroughly handles organic sewage to reach Purpose.The Fenton reagent of large dosage can make the polymer of phenol be further converted into CO2, to achieve the purpose that purify waste water. For aromatic compound, OH can destroy aromatic rings, aliphatic compound be formed, to eliminate aromatic compound Bio-toxicity, improve the biodegradability of waste water.For dyestuff, OH can directly attack chromophoric group, open dyestuff The unsaturated bond of color development functional group, decomposes dye oxidation, while achieving the purpose that decolourize to waste water and reduce COD.This Outside, for certain water soluble organic substances (such as naphthalene system organic matter with sulfonic acid group), OH can be reacted, and change its electricity Sub- cloud density and structure reduce its water solubility, are conducive to be removed it using coagulation or the method for absorption.
The two combination makes difficult to degrade in waste water to have by Fe-C micro electrolysis oxidation and Fenton free-radical oxidation collective effect Machine object decomposes oxidation, generates carbon dioxide, water and other inorganic matters.
Two examples are described below:
Example one: the organic wastewater of certain PCB factory enters this device after the acidification of its acidification pool, enters water color in blue-green, pH is about It is 1 ~ 2, institute's metal ion is mainly copper ion, and COD is about 2500 ~ 3000 mg/L.Waste water is extracted via water pump to iron carbon pond 1, flow 3m3/h.Since waste water is acidified, it is steady that pH regulating device 1 is mainly used for monitoring liquid pH in iron carbon pond Determine and meets the requirements.Aeration method 6 is aerated to provide air into pond, is made solution oxygen content in 1.5 ~ 2mg/L, is promoted iron carbon micro- Cell reaction, by reaction, the metal ions such as copper ion can be replaced and be detached from waste water, and the pollutants such as larger molecular organics also may be used It is reacted and a part of degrading, while generating ferrous ion, pH is slightly increased, and the residence time is about 40 ~ 50min.It flows into later Fenton pond 2, because pH and ferrous ion due to adjusting by iron carbon pond 1 without being provided, therefore one 9 need of chemicals dosing plant add dioxygen Water, in this embodiment, dosage are 167mL/min 50%H2O2, are aerated by aeration method 6 to guarantee to be uniformly mixed, By Fenton advanced oxidation reaction, remaining pollutant can be degraded in waste water, and COD is substantially reduced, and the residence time is about 2h.It Enter coagulating basin 3 afterwards, it is 8 ~ 9 that entrance, which automatically adjusts pH by pH regulating device 28, therefore iron ion contained in water and it is ferrous from Son will form wadding body, then add the coagulant PAM of 10ppm, dosage 208mL/min in entrance, to promote small wadding body to agglomerate At big flocculating body, the agitating device 11 in pond promotes coagulation effect by stirring, and the residence time is about 1h.Finally flow into sedimentation basin 4, inclined plate 12 can promote mud-water separation effect, and sludge deposit is discharged in bottom by bottom mud discharging mouth, and clear water is by top overflow port stream Out, water outlet COD is lower, and clear, colorless is tasteless.Several groups of test results are chosen, see the table below.
1 example of table, one test data
Example two: certain water of PCB factory after processing enters the transparent free from extraneous odour of water color, and pH is about that 7 ~ 8, COD is about 300 ~ 400 mg/L.Waste water is extracted via water pump to iron carbon pond 1, flow 3m3/h.It is automatically adjusted into water pH by pH regulating device 11 ~ 2 Between, the aeration of aeration method 6 promotes iron-carbon micro-electrolysis reaction, by reaction, metal ion can be set to provide air into pond It changes and is detached from waste water, the pollutants such as larger molecular organics can also be reacted and be degraded a part, while generate ferrous ion, and pH is omited There is raising, the residence time is about 40 ~ 50min.Flow into Fenton pond 2 later, because pH and ferrous ion without due to adjusting by iron carbon pond 1 Offer, therefore one 9 need of chemicals dosing plant add hydrogen peroxide, in this embodiment, dosage is 104mL/min 50% H2O2, it is aerated by aeration method 6 to guarantee to be uniformly mixed, by Fenton advanced oxidation reaction, remaining pollutant can quilt in waste water Degradation, COD are substantially reduced, and the residence time is about 2h.Enter coagulating basin 3 later, entrance automatically adjusts pH by pH regulating device 28 It is 8 ~ 9, therefore iron ion and ferrous ion contained in water will form wadding body, then add the coagulant PAM of 10ppm in entrance, Dosage is 208mL/min, and to promote small wadding body to be condensed into big flocculating body, the agitating device 11 in pond promotes coagulation effect by stirring Fruit, residence time are about 1h.Finally flow into sedimentation basin 4, inclined plate 12 can promote mud-water separation effect, sludge deposit in bottom, It is discharged by bottom mud discharging mouth, clear water is flowed out by top overflow port, and water outlet COD is lower, and clear, colorless is tasteless.Choose several groups of test knots Fruit see the table below.
2 example of table, two test data

Claims (4)

1. a kind of PCB industry wastewater treatment method, characterized in that waste water successively passes through consisting of unit:
Iron carbon pond, top are equipped with water inlet and pH self-checking device, and adjusting into water is acidity, and its bottom is equipped with aeration side Method；
Fenton pond, water inlet are equipped with automatic medicine adding apparatus, hydrogen peroxide are added, and its bottom is equipped with aeration method；
Coagulating basin, water inlet are equipped with pH self-checking device, and adjusting into water is alkalinity, and water inlet is additionally provided with Automatic Dosing dress It sets, coagulant is added；
Sedimentation basin, bottom are equipped with mud discharging mouth.
2. processing method according to claim 1, characterized in that iron carbon pond and Fenton bottom of pond portion are equipped with aeration side Method.
3. processing method according to claim 1, characterized in that be equipped with inclined plate in the sedimentation basin.
4. processing method according to claim 1, characterized in that be equipped with agitating device in the coagulating basin.
CN201710603365.7A 2017-07-22 2017-07-22 A kind of PCB industry wastewater treatment method Pending CN109279724A (en)

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CN201710603365.7A CN109279724A (en) 2017-07-22 2017-07-22 A kind of PCB industry wastewater treatment method

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110436668A (en) * 2019-08-09 2019-11-12 石家庄新奥环保科技有限公司 Wastewater treatment method and system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202519114U (en) * 2012-04-13 2012-11-07 中山大学 Combined treatment device for chemical oxygen demand (COD) in polychlorinated biphenyl (PCB) waste water

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202519114U (en) * 2012-04-13 2012-11-07 中山大学 Combined treatment device for chemical oxygen demand (COD) in polychlorinated biphenyl (PCB) waste water

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110436668A (en) * 2019-08-09 2019-11-12 石家庄新奥环保科技有限公司 Wastewater treatment method and system

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Application publication date: 20190129