CN108101253A - A kind of processing method of heavy metal wastewater thereby - Google Patents

A kind of processing method of heavy metal wastewater thereby Download PDF

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Publication number
CN108101253A
CN108101253A CN201711214298.6A CN201711214298A CN108101253A CN 108101253 A CN108101253 A CN 108101253A CN 201711214298 A CN201711214298 A CN 201711214298A CN 108101253 A CN108101253 A CN 108101253A
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China
Prior art keywords
waste water
flocculant
heavy metal
processing
addition
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CN201711214298.6A
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Inventor
万选志
刘明实
付勇
王立辉
魏峰
刘子龙
逄军武
达娃卓玛
胡其旭
柳晓蒙
赵虎诚
卓玛翁母
李兰新
王玉军
张常红
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TIBET HUATAILONG MINING DEVELOPMENT Co Ltd
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TIBET HUATAILONG MINING DEVELOPMENT Co Ltd
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Priority to CN201711214298.6A priority Critical patent/CN108101253A/en
Publication of CN108101253A publication Critical patent/CN108101253A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B15/00Obtaining copper
    • C22B15/0063Hydrometallurgy
    • C22B15/0084Treating solutions
    • C22B15/0089Treating solutions by chemical methods
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22BPRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/006Wet processes
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/66Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/20Heavy metals or heavy metal compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00General aspects of water treatment
    • C02F2301/08Multistage treatments, e.g. repetition of the same process step under different conditions

Abstract

The invention discloses a kind of processing methods of heavy metal wastewater thereby, include the following steps:(1)Except iron operation, the pH value of waste water is adjusted to 4-5, adds in flocculant, sedimentation removes the iron ion in waste water;(2)Heavy copper operation, to through step(1)Add in vulcanized sodium and flocculant in treated supernatant, the copper ion in sedimentation removal waste water;(3)Operation is neutralized, is adjusted through step(2)The pH value of treated supernatant adds in flocculant to 6-7, the heavy metal ion in sedimentation removal waste water, and heavy metal in waste water can effectively be removed by obtaining the clear water present invention of qualified discharge, and waste water is made to meet discharge standard.

Description

A kind of processing method of heavy metal wastewater thereby
Technical field
The invention belongs to technical field of waste water processing, relate in particular to a kind of processing method of heavy metal wastewater thereby, especially The waste water severely exceeded suitable for processing copper, iron concentration.
Background technology
What heavy metal wastewater thereby referred to discharge in the industrial processes such as mining and metallurgy, machine-building, chemical industry, electronics, instrument contains weight The waste water of metal.Heavy metal (such as cupric, iron, manganese, cadmium, nickel, mercury, zinc) waste water is to an environmental pollution most serious and to the mankind One of maximum industrial wastewater is endangered, water quality and quantity is related with production technology.Heavy metal in waste water cannot generally decompose brokenly It is bad, its existence position can only be shifted and change its Material Form.The technique of domestic and international heavy metal containing wastewater treatment has following several at present In:
(1)Neutralisation
Neutralisation is exactly to put into alkali nertralizer in oxytropism improvement stoste, and reaching increase using the neutralization reaction of soda acid administers stoste The purpose of pH value.Meanwhile heavy metal ion is made to react with hydroxide ion, generate the hydroxide precipitation of indissoluble, purification It administers.Theoretically, lime or lime stone can make precipitated metal under certain pH value, but by the improvement of being handled stoste In may contain its precipitation of reagents or ion and precipitation performance level very different, while the calcium sulfate slag generated after handling It is more, it be easy to cause secondary pollution.
(2)Vulcanization
It is to put into vulcanizing agent into improvement stoste, the side that the metal ion in improvement stoste is made to form sulfide precipitation and is removed Method.Usually used vulcanizing agent has hydrogen sulfide, vulcanized sodium etc..The pH value accommodation of this method is big, and the sulfide of generation compares hydrogen-oxygen Compound solubility smaller, removal efficiency is high, and metal content is high in body refuse, convenient for recycling.But vulcanizing agent limited source, price Costly, and the hydrogen sulfide foul smelling that generates, it is hazardous to the human body, when improper use can cause air pollution.
(3)Ion-exchange
The process of ion exchange occurs using heavy metal and ion exchange resin, reaches enriching heavy metal ion, elimination or reduction Administer the purpose of heavy metal ion in stoste.Various ion exchange resin treatment capacity are big, effluent quality is good but resin needs frequently Regeneration, operating cost are very high.
(4)Membrane technology
Pre-processed using ceramic membrane, the pore size filter of microfiltration of ceramic membrane is about 0.1 μm, go water removal in inorganic impurity such as Fine sand, crystalline particle, suspended material etc., ceramic membrane carry out cleaning recovery by techniques such as gas backwash, water backwashes.It is carried using pump Boosting power enters the concentration of level-one film, and primary concentration separates raw water to form concentrate and dialyzate, with the progress of concentration, film surface The osmotic pressure of solution gradually increases, and the resistance of filtering increases, and permeate concentration is consequently increased, when the concentrate of primary concentration is dense When degree is unable to reach recycling and requires, primary concentration liquid enters secondary concentration, the concentration for administering stoste is further improved, due to two level Concentration is carried out on higher original liquid concentration, thus using it is higher enter film pressure separated, it is higher to obtain Cycles of concentration, secondary concentration liquid can generally meet the requirement of recycling metal ion, and the dialyzate ion of secondary concentration at this time Concentration is higher, can return to primary concentration, and concentrate extracts effective ingredient therein using extraction process.Using the technique, due to There is very high request in operation and management aspect, the replacement cycle of membrane component is very short, and investment is very big, is generally only applicable to small water and returns Receive the metal ion in waste liquid.
(5)Nanometer pharmaceutical techniques
The reducing power and chemical mobility of the surface of nanometer medicament uniqueness can be applied to heavy metal and administer the efficient of stoste field Removal.There is good removal effect to arsenic, cadmium, copper, lead, nickel, zinc, mercury in water etc. using nanometer medicament.Nanometer medicament is due to it Large specific surface area, reaction rate higher, required time are shorter.Nanometer medicament is with underwater gold category ionic reaction rate far above common Medicament, nanometer medicament and underwater gold category ionic reaction are fast, and processing capacity is 10 to 1000 times of common material.But nanometer medicament is still In development phase, at this stage mainly for the treatment of organic wastewater, the inorganic point of water containing heavy metal ion is mainly adopted at this stage Reducing agent is made with nano zero valence iron, application range is relatively narrow.
(6)Electrochemical treatments
During using iron, aluminium anodes electrolysis, the Anodic Stripping Fe under the action of extrinsic current3+Or Al3+, it is combined into the OH- in solution Fe (OH) not soluble in water 3Or Al (OH) 3, these particles are very strong to the cohesion of water-borne glue body particle and adsorptivity, can be used for Handle the organic or inorganic colloid grains in acid water.The electrode equipments such as iron, aluminium are simple, take up little area, is easy to operate, can effectively return Valuable metal is received, to achieve the purpose that administer stoste discharge or recycling.H in water simultaneously+It is converted into H2, it is former to improve acidic treating The pH value of liquid generally reduces the consumption of alkali in technique.But the method power consumption is big, on plateau winter can not implement.
In addition, Chinese patent notification number be CN104261526 the prior art disclosed on January 7th, 2015 it is a kind of heavy The processing method of metallic wastewater, technical solution include:Add in vulcanized sodium when handling heavy metal wastewater thereby, the sulphur in vulcanized sodium with Heavy metal forms particulate matter, further adds in the sulfide precipitation of heavy metal, and the sulfide precipitation volume for adding in heavy metal is 5-the 50% of the volume of waste water is handled, then stirs, then stands, drives newly-generated particulate matter fast with generated precipitation Speed precipitation.But in actual process, this kind of processing method remains following defect:1. this method is too single, Focus on accelerating separation of solid and liquid in wastewater treatment;2. failing to realize that the branch of valuable metal recycles, the wasting of resources is caused;3. sulphur Compound dosage is big, and the hydrogen sulfide of generation is unrecovered, and secondary pollution is caused to environment.
The content of the invention
It is an object of the invention to overcome the above-mentioned problems in the prior art, a kind of processing of heavy metal wastewater thereby is provided Method, the present invention can effectively remove the heavy metal in waste water, and waste water is made to meet discharge standard.
To achieve the above object, the technical solution adopted by the present invention is as follows:
A kind of processing method of heavy metal wastewater thereby, it is characterised in that include the following steps:
(1)Except iron operation
The pH value of waste water is adjusted to 4-5, adds in flocculant, sedimentation removes the iron ion in waste water;
(2)Heavy copper operation
To through step(1)Add in vulcanized sodium and flocculant in treated supernatant, the copper ion in sedimentation removal waste water;
(3)Neutralize operation
It adjusts through step(2)The pH value of treated supernatant adds in flocculant to 6-7, the heavy metal in sedimentation removal waste water Ion obtains the clear water of qualified discharge.
The step(2)In obtained sediment part add in the step in the supernatant before adding in vulcanized sodium, sink The addition of drop object accounts for the 20% of supernatant total amount.
The step(1)In milk of lime added under stirring adjust pH value, mixing time is 8-12min, and every liter is useless The addition of milk of lime is 8.4-9.2g in water.
The step(1)In add in flocculant under stirring, mixing time is 8-12min, is flocculated in waste water per ton The addition of agent is 4.5-5.5g.
The step(2)In add in vulcanized sodium under stirring, mixing time is 8-12min, is vulcanized in waste water per ton The addition of sodium is 1100-1250g.
The step(2)In add in flocculant under stirring, mixing time is 8-12min, is flocculated in waste water per ton The addition of agent is 4.5-5.5g.
The step(3)In milk of lime added under stirring adjust pH value, mixing time is 8-12min, and every liter is useless The addition of milk of lime is 9.5-10.5g in water.
The step(3)In add in flocculant under stirring, mixing time is 8-12min, is flocculated in waste water per ton The addition of agent is 9-11g.
The step(1)In sedimentation time for 2-4min, the step(2)In sedimentation time for 1-3min, institute State step(3)In sedimentation time be 4-6min.
Advantage using the present invention is:
1st, step of the present invention(1)Add flocculant again after middle adjusting pH to 4-5, the advantage is that can make flocculant well with sinking Starch generates floc sedimentation.And if being to add in flocculant outside 4-5 scope in pH value, flocculating effect will be influenced.Step(2)In The advantages of adding in vulcanized sodium and flocculant is that vulcanized sodium, which can provide sulphion, makes it generate copper sulfide with the copper ion in waste water It precipitates and recycles valuable metal, and belong to ultrafine particle after copper sulfide precipitation, therefore larger wadding can be formed by flocculant Group, so as to be conducive to accelerate precipitation.Step(3)Middle adjusting pH value is to reach effluent quality requirement-integrated wastewater to 6-7 Bis- class first discharge standards of discharge standard GB8978-1996 add flocculant to be then advantageously implemented separation of solid and liquid, reduce water outlet and contain admittedly Amount.The present invention sinks the thinking of copper after iron and is handled, can recycle in waste water according to heavy-metal acid waste water property using first removing Valuable metal copper, so as to reduce processing cost.The technique of iron is sunk after copper according to first receiving, and first adding in vulcanized sodium sulphion will be with Iron ion, copper ion reaction generation precipitation, can cause the copper grade of recycling relatively low and influence to sell.
2nd, it is of the invention by step(2)In obtained sediment part add in through step(1)In treated supernatant, sedimentation The addition of object accounts for the 20% of supernatant total amount;The advantages of program, is sediment heavy metal sulfide Returning process and sulphur Change sodium mixing, so that heavy metal sulfide precipitation repeated action forms precipitate nucleation, increase Floe structure, accelerate sedimentation speed Degree increases bed mud concentration.
3rd, step of the present invention(1)In in every liter of waste water the addition of milk of lime be 8.4-9.2g, the advantage is that control pH Value had not only ensured that iron ion was effectively removed in this step, but also has reduced the loss late of copper to 4-5.And in waste water per ton The addition of flocculant is 4.5-5.5g, then is the optimum condition for ensureing floc sedimentation sedimentation, is conducive to accelerate sinking speed.
4th, step of the present invention(2)In in waste water per ton the addition of vulcanized sodium be 1100-1250g, the advantage is that can make Copper ion precipitates completely, while reduces the generation of hydrogen sulfide gas.
5th, step of the present invention(3)In in every liter of waste water the addition of milk of lime be 9.5-10.5g, the advantage is that guarantee Water outlet pH value reaches 6-7, meets effluent quality requirement.
Specific embodiment
Embodiment 1
A kind of processing method of heavy metal wastewater thereby, includes the following steps:
(1)Except iron operation
The pH value of milk of lime adjusting waste water is added in into waste water under stirring to 4-5, it is useless to add flocculant sedimentation removal Ferric ion in water.Wherein, the addition of milk of lime is 8.4-9.2g in every liter of waste water, flocculant in waste water per ton Addition is 4.5-5.5g, persistently stirs 8-12min after adding in milk of lime, 8-12min is persistently stirred after adding in flocculant, After the completion of adding in flocculant and stirring, 2-4min is settled, remove the ferric ion in waste water and obtains supernatant.
(2)Heavy copper operation
To through step under stirring(1)Vulcanized sodium and flocculant are sequentially added in treated supernatant, the sulphur first added in Change sodium and the bivalent cupric ion reaction generation copper sulfide in supernatant, the flocculant added in afterwards will belong to the copper sulfide of ultrafine particle The larger floc sedimentation of volume is flocculated into, then the bivalent cupric ion in waste water is removed through sedimentation.Wherein, in waste water per ton vulcanized sodium plus Entering amount for 1100-1250g, the addition of flocculant is 4.5-5.5g in waste water per ton, add in after vulcanized sodium and persistently stir 8- 12min persistently stirs 8-12min after adding in flocculant, after the completion of adding in flocculant and stirring, settles 1-3min, removal is useless Bivalent cupric ion in water simultaneously obtains further supernatant.
In the sediment that this step obtains, take out sediment Xun Huan and add in supernatant of the step before vulcanized sodium is added in In, the addition of sediment accounts for the 20% of supernatant total amount, brilliant in order to which heavy metal sulfide precipitation repeated action is made to form precipitation Core increases Floe structure, accelerates sinking speed, increases bed mud concentration.
(3)Neutralize operation
To through step under stirring(2)Milk of lime is added in treated supernatant and adjusts pH value to 6-7, adds wadding Remaining copper ion, iron ion and remaining heavy metal ion in solidifying agent sedimentation removal waste water, obtain the clear water of qualified discharge.Its In, the addition of milk of lime is 9.5-10.5g in every liter of waste water, and the addition of flocculant is 9-11g in waste water per ton, is added in 8-12min is persistently stirred after milk of lime, 8-12min is persistently stirred after adding in flocculant, after the completion of adding in flocculant and stirring, 4-6min of sedimentation is the clear water that can obtain qualified discharge.
Embodiment 2
A kind of processing method of heavy metal wastewater thereby, includes the following steps:
(1)Except iron operation
The pH value of milk of lime adjusting waste water is added in into waste water under stirring to 4, adds flocculant sedimentation removal waste water In ferric ion.Wherein, the addition of milk of lime is 8.4g in every liter of waste water, and the addition of flocculant is in waste water per ton 4.5g persistently stirs 8min after adding in milk of lime, and 12min is persistently stirred after adding in flocculant, adds in flocculant and stirs completion Afterwards, 2min is settled, remove the ferric ion in waste water and obtains supernatant.
(2)Heavy copper operation
To through step under stirring(1)Vulcanized sodium and flocculant are sequentially added in treated supernatant, the sulphur first added in Change sodium and the bivalent cupric ion reaction generation copper sulfide in supernatant, the flocculant added in afterwards will belong to the copper sulfide of ultrafine particle The larger floc sedimentation of volume is flocculated into, then the bivalent cupric ion in waste water is removed through sedimentation.Wherein, in waste water per ton vulcanized sodium plus Enter amount for 1100g, the addition of flocculant is 4.5g in waste water per ton, persistently stirs 8min after adding in vulcanized sodium, adds in flocculation 12min is persistently stirred after agent, after the completion of adding in flocculant and stirring, settles 1min, remove the bivalent cupric ion in waste water and is obtained To further supernatant.
In the sediment that this step obtains, take out sediment Xun Huan and add in supernatant of the step before vulcanized sodium is added in In, the addition of sediment accounts for the 20% of supernatant total amount, brilliant in order to which heavy metal sulfide precipitation repeated action is made to form precipitation Core increases Floe structure, accelerates sinking speed, increases bed mud concentration.
(3)Neutralize operation
To through step under stirring(2)Milk of lime is added in treated supernatant and adjusts pH value to 6, adds flocculant Remaining copper ion, iron ion and remaining heavy metal ion in sedimentation removal waste water, obtain the clear water of qualified discharge.Wherein, often The addition of milk of lime in waste water is risen as 9.5g, the addition of flocculant is 9g in waste water per ton, is persistently stirred after adding in milk of lime 8min is mixed, 12min is persistently stirred after adding in flocculant, after the completion of adding in flocculant and stirring, sedimentation 4min can obtain up to standard The clear water of discharge.
Embodiment 3
A kind of processing method of heavy metal wastewater thereby, includes the following steps:
(1)Except iron operation
The pH value of milk of lime adjusting waste water is added in into waste water under stirring to 5, adds flocculant sedimentation removal waste water In ferric ion.Wherein, the addition of milk of lime is 9.2g in every liter of waste water, and the addition of flocculant is in waste water per ton 5.5g persistently stirs 12min after adding in milk of lime, and 8min is persistently stirred after adding in flocculant, adds in flocculant and stirs completion Afterwards, 4min is settled, remove the ferric ion in waste water and obtains supernatant.
(2)Heavy copper operation
To through step under stirring(1)Vulcanized sodium and flocculant are sequentially added in treated supernatant, the sulphur first added in Change sodium and the bivalent cupric ion reaction generation copper sulfide in supernatant, the flocculant added in afterwards will belong to the copper sulfide of ultrafine particle The larger floc sedimentation of volume is flocculated into, then the bivalent cupric ion in waste water is removed through sedimentation.Wherein, in waste water per ton vulcanized sodium plus Enter amount for 1250g, the addition of flocculant is 5.5g in waste water per ton, persistently stirs 12min after adding in vulcanized sodium, adds in flocculation 8min is persistently stirred after agent, after the completion of adding in flocculant and stirring, settles 3min, the bivalent cupric ion in waste water is removed and obtains Further supernatant.
In the sediment that this step obtains, take out sediment Xun Huan and add in supernatant of the step before vulcanized sodium is added in In, the addition of sediment accounts for the 20% of supernatant total amount, brilliant in order to which heavy metal sulfide precipitation repeated action is made to form precipitation Core increases Floe structure, accelerates sinking speed, increases bed mud concentration.
(3)Neutralize operation
To through step under stirring(2)Milk of lime is added in treated supernatant and adjusts pH value to 7, adds flocculant Remaining copper ion, iron ion and remaining heavy metal ion in sedimentation removal waste water, obtain the clear water of qualified discharge.Wherein, often The addition of milk of lime in waste water is risen as 10.5g, the addition of flocculant is 11g in waste water per ton, is continued after adding in milk of lime 12min is stirred, 8min is persistently stirred after adding in flocculant, after the completion of adding in flocculant and stirring, sedimentation 6min can be reached Mark the clear water of discharge.
Embodiment 4
A kind of processing method of heavy metal wastewater thereby, includes the following steps:
(1)Except iron operation
The pH value of milk of lime adjusting waste water is added in into waste water under stirring to 4.5, it is useless to add flocculant sedimentation removal Ferric ion in water.Wherein, the addition of milk of lime is 8.8g in every liter of waste water, the addition of flocculant in waste water per ton For 5g, 10min is persistently stirred after adding in milk of lime, 10min is persistently stirred after adding in flocculant, flocculant is added in and stirs completion Afterwards, 3min is settled, remove the ferric ion in waste water and obtains supernatant.
(2)Heavy copper operation
To through step under stirring(1)Vulcanized sodium and flocculant are sequentially added in treated supernatant, the sulphur first added in Change sodium and the bivalent cupric ion reaction generation copper sulfide in supernatant, the flocculant added in afterwards will belong to the copper sulfide of ultrafine particle The larger floc sedimentation of volume is flocculated into, then the bivalent cupric ion in waste water is removed through sedimentation.Wherein, in waste water per ton vulcanized sodium plus Enter amount for 1200g, the addition of flocculant is 5g in waste water per ton, persistently stirs 10min after adding in vulcanized sodium, adds in flocculant Persistently stir 9min afterwards, after the completion of adding in flocculant and stirring, settle 2min, remove the bivalent cupric ion in waste water and obtain into The supernatant of one step.
In the sediment that this step obtains, take out sediment Xun Huan and add in supernatant of the step before vulcanized sodium is added in In, the addition of sediment accounts for the 20% of supernatant total amount, brilliant in order to which heavy metal sulfide precipitation repeated action is made to form precipitation Core increases Floe structure, accelerates sinking speed, increases bed mud concentration.
(3)Neutralize operation
To through step under stirring(2)Milk of lime is added in treated supernatant and adjusts pH value to 6.5, adds flocculation Remaining copper ion, iron ion and remaining heavy metal ion in agent sedimentation removal waste water, obtain the clear water of qualified discharge.Wherein, The addition of milk of lime is 10g in every liter of waste water, and the addition of flocculant is 10g in waste water per ton, is continued after adding in milk of lime 11min is stirred, 10min is persistently stirred after adding in flocculant, after the completion of adding in flocculant and stirring, sedimentation 5min can be reached Mark the clear water of discharge.
Certain high altitude localities heavy metal wastewater thereby is handled using processing method of the present invention below, it is specific as follows:
The high altitude localities heavy metal wastewater thereby is measured, the results are shown in Table 1:
As known from Table 1, which it is very high to enter the copper of factory's waste water, Fe and Mn content, especially Copper, iron concentration are exceeded serious.And after using processing method of the present invention processing, the heavy metal in waste water can be effectively removed Ion, and make final outflow water qualified discharge, specific handling result is shown in Table 2:

Claims (9)

1. a kind of processing method of heavy metal wastewater thereby, it is characterised in that include the following steps:
(1)Except iron operation
The pH value of waste water is adjusted to 4-5, adds in flocculant, sedimentation removes the iron ion in waste water;
(2)Heavy copper operation
To through step(1)Add in vulcanized sodium and flocculant in treated supernatant, the copper ion in sedimentation removal waste water;
(3)Neutralize operation
It adjusts through step(2)The pH value of treated supernatant adds in flocculant to 6-7, the heavy metal in sedimentation removal waste water Ion obtains the clear water of qualified discharge.
2. a kind of processing method of heavy metal wastewater thereby as described in claim 1, it is characterised in that:The step(2)In obtain Sediment part add in the step in the supernatant before adding in vulcanized sodium, the addition of sediment accounts for supernatant total amount 20%。
3. a kind of processing method of heavy metal wastewater thereby as described in claim 1, it is characterised in that:The step(1)In stirring Mix and milk of lime is added under state adjust pH value, mixing time is 8-12min, in every liter of waste water the addition of milk of lime for 8.4- 9.2g。
4. a kind of processing method of heavy metal wastewater thereby as described in claim 1, it is characterised in that:The step(1)In stirring It mixes and flocculant is added under state, mixing time is 8-12min, and the addition of flocculant is 4.5-5.5g in waste water per ton.
5. a kind of processing method of heavy metal wastewater thereby as described in claim 1, it is characterised in that:The step(2)In stirring It mixes and vulcanized sodium is added under state, mixing time is 8-12min, and the addition of vulcanized sodium is 1100-1250g in waste water per ton.
6. a kind of processing method of heavy metal wastewater thereby as described in claim 1, it is characterised in that:The step(2)In stirring It mixes and flocculant is added under state, mixing time is 8-12min, and the addition of flocculant is 4.5-5.5g in waste water per ton.
7. a kind of processing method of heavy metal wastewater thereby as described in claim 1, it is characterised in that:The step(3)In stirring Mix and milk of lime is added under state adjust pH value, mixing time is 8-12min, in every liter of waste water the addition of milk of lime for 9.5- 10.5g。
8. a kind of processing method of heavy metal wastewater thereby as described in claim 1, it is characterised in that:The step(3)In stirring It mixes and flocculant is added under state, mixing time is 8-12min, and the addition of flocculant is 9-11g in waste water per ton.
9. a kind of processing method of heavy metal wastewater thereby as described in claim 1, it is characterised in that:The step(1)In it is heavy The drop time be 2-4min, the step(2)In sedimentation time for 1-3min, the step(3)In sedimentation time for 4- 6min。
CN201711214298.6A 2017-11-28 2017-11-28 A kind of processing method of heavy metal wastewater thereby Pending CN108101253A (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN110240456A (en) * 2019-07-24 2019-09-17 西安建筑科技大学 A kind of processing method and heavy metal ion-sulphate aluminium cement-bentonite composite material containing heavy metal ion industrial wastewater

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