CN109110976A - The recycling processing method and device of heavy metal ions in wastewater - Google Patents
The recycling processing method and device of heavy metal ions in wastewater Download PDFInfo
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- CN109110976A CN109110976A CN201811171428.7A CN201811171428A CN109110976A CN 109110976 A CN109110976 A CN 109110976A CN 201811171428 A CN201811171428 A CN 201811171428A CN 109110976 A CN109110976 A CN 109110976A
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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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working 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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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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
- 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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/62—Heavy metal compounds
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/14—Paint wastes
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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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
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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
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a kind of recycling processing method of heavy metal ions in wastewater and devices, and the Forming Mechanism of precipitated product in practical coating wastewater under different pH is had studied based on Gibbs function, finds the optimal pH for making precipitation by metallic ion；Raw water is filtered by earthenware slab film, removal SS, oils etc.；Filtrate enters coagulative precipitation tank, adjusts the sediment that optimum pH isolates iron ion；Supernatant enters alkali cleaning pond, adjusts the sediment that optimum pH isolates nickel ion；Supernatant enters subsequent neutralization pond, adjusts the sediment that optimum pH isolates zinc ion.The medicine have the advantages that realizing the recycling of iron, zinc, metal ion in three kinds of coating wastewaters of nickel, the sediment for avoiding metal ion from being formed adversely affects environment, easy to operate, simple process, and the rate of recovery is high.
Description
Technical field
The present invention relates to coating wastewater recovery technology fields, and in particular at a kind of recycling of heavy metal ions in wastewater
Manage method and apparatus.
Background technique
According to statistics, the waste water that the annual bicycle spraying process in China generates is about 3,500,000,000 tons, annual vehicle spray painting technique
The waste water of generation is about 8,000,000,000 tons.Coating wastewater water quality is complicated, and chemical oxygen consumption (COC) content is high, generally 1200~2000mg/
L, biodegradability is poor, the index of sewage bio-degradable: the ratio < 0.3 of biochemical oxygen demand (BOD)s on the 5th and COD.Coating
Acid strong, a large amount of iron, nickel, manganese, zinc, Cl are contained in pH=1.5~3.0-、SO4 2-Etc. a variety of inorganic pollutions, such as zinc ion concentration
For 250~300mg/L.
Coagulating sedimentation is processing coating wastewater tradition and common technique, will necessarily generate plurality of heavy metal using this technique
Sediment, this waste are defined as hazardous waste.The annual output of whole world hazardous waste is more than 4 × 10 at present8Ton, China's danger
The annual output of dangerous waste increases year by year, and annual average rate of increase is relatively high, and by 2015, the annual output of China's hazardous waste reached
60000000 tons.
Mainly there are two aspects for the harm of hazardous waste: inappropriate discharge and storage, hazardous waste is in rainwater and underground
Under the prolonged permeation and diffusion of water, water body and soil receive pollution；After human contact unfavorable shadow can be generated to human health
It is loud or even carcinogenic.
Summary of the invention
Aiming at the shortcomings in the prior art, the first object of the present invention is to provide one kind and can recycle in coating wastewater step by step
Metal ion device.
The second object of the present invention is to provide a kind of disposition minimizing that can satisfy hazardous waste, recycling, innoxious
Requirement the processing method that precipitates of heavy metal ion.
To achieve the above object, it is produced for the metallic element in vehicle coating wastewater by different metal ions under different pH
The principle of raw sediment, three metal ion species are separated from waste water, are separately recovered.
The technical solution adopted by the present invention is that: a kind of processing equipment for recycling of heavy metal ions in wastewater, including sequentially
Earthenware slab membrane cisterna, coagulative precipitation tank, alkali cleaning pond, neutralization pond and the PLC controller of connection, bottom in the earthenware slab membrane cisterna
Equipped with aeration pump；The coagulative precipitation tank, alkali cleaning pond are respectively equipped with coagulation area and settling zone in neutralization pond, and the coagulation area is set
There are agitating device and chemicals dosing plant；The PLC controller, which is respectively equipped with, protrudes into the coagulative precipitation tank, alkali cleaning pond, in neutralization pond
It the monitoring probe of stirring area and is electrically connected with the chemicals dosing plant, aeration pump.
The coagulative precipitation tank is connected to by the way that the side wall to connect with alkali cleaning pond is low with alkali cleaning pond, and the alkali cleaning pond passes through in
It is connected to the side wall bottom that pond connects with neutralization pond.
The water inlet of the earthenware slab membrane cisterna is connect by pipeline with water pump, and earthenware slab membrane module, pottery are equipped in pond
Porcelain plate film assembly top is sequentially connected valve and filtered water pump by pipeline, is cut off the water by the pumping that valve controls filtered water pump,
The subsequent pipeline of filtered water pump is connect with coagulative precipitation tank；Earthenware slab membrane module top by pipeline be also sequentially connected valve and
Backwash pump, earthenware slab membrane cisterna bottom are equipped with aerator and connect aeration pump by pipeline；
The coagulative precipitation tank is connect by pipeline with filtered water pump, and coagulative precipitation tank is divided into coagulation area and sunk by partition
Shallow lake area two parts are equipped with agitating device in coagulation area and are connect by agitating paddle with the stirring motor on pond top, and hydrogen peroxide adds
Medicinal cupping connection metering pump is connected in coagulation area by pipeline, and sodium hydroxide grug feeding jar connection metering pump is connected to mixed by pipeline
In coagulation zone, flow guiding slit is formed between partition and inclined plate, coagulation area and settling zone are connected through flow guiding slit, and bottom of pond portion is equipped with sludge pipe；
The water inlet in the alkali cleaning pond is come by the settling zone overflow of coagulative precipitation tank, and alkali cleaning pond is divided into coagulation area by partition
With settling zone two parts, it is equipped with agitating device in coagulation area and is connect by agitating paddle with the stirring motor on pond top, hydroxide
Sodium grug feeding jar connection metering pump is connected in coagulation area by pipeline, forms flow guiding slit between partition and inclined plate, coagulation area with sink
Shallow lake area is connected through flow guiding slit, and bottom of pond portion is equipped with sludge pipe；
The neutralization pond water inlet is come by the settling zone overflow in alkali cleaning pond, and alkali cleaning pond is divided into coagulation by partition in pond
Area and settling zone two parts are equipped with agitating device in coagulation area and are connect by agitating paddle with the stirring motor on pond top, hydrochloric acid
Grug feeding jar connection metering pump is connected in coagulation area by pipeline, and flow guiding slit, coagulation area and precipitating are formed between partition and inclined plate
Area is connected through flow guiding slit, and bottom of pond portion is equipped with sludge pipe, and water outlet is discharged by outlet pipe；
The PLC controller is electrically connected with each metering pump of chemicals dosing plant.
Enter coagulative precipitation tank by filtered water pump by valve control through the filtered drainage excessively of earthenware slab membrane cisterna, it is described
Earthenware slab membrane module is also connected with Backwash pipeline, by valve control by backwash pump be pumped into backwashing water to membrane module into
Row cleaning.
The agitating device uses three-bladed propeller, and the blade of the three-bladed propeller is that three camber blades are formed,
Water is quickly stirred evenly with drug and is lifted up water, circulates water in coagulation area.
The another technical solution that the present invention uses is: a kind of recycling processing method of heavy metal ions in wastewater, packet
Include following steps:
Step 1: waste water filters in earthenware slab membrane cisterna: raw water is pumped into earthenware slab membrane cisterna by intake pump, is being filtered
Under the swabbing action of water pump, waste water flows through pipeline through film and enters in coagulative precipitation tank, and oils, SS impurity are trapped within ceramics
Plate film assembly surface；When cleaning to membrane module, under the action of backwash pump, clear water is pumped into earthenware slab film
Component internal, while the bubble for cooperating aerator to generate washes the substance for being attached to earthenware slab membrane module surface；
It is precipitated Step 2: the waste water outflow by step 1 enters in coagulative precipitation tank: will by the probe in coagulation area
The concentration of the pH of waste water and ferrous ion reflects into PLC controller, and PLC controller control metering pump and metering pump are opened
The pH of waste water is maintained at 3-5 in Guan Shi coagulation area, and ferrous ion disappears, and then metering pump is by the hydrogen peroxide in grug feeding jar
It is added in the coagulation area of coagulative precipitation tank, by Fe2+It is oxidized to Fe3+, the sodium hydroxide in grug feeding jar is added to mixed by metering pump
In the coagulation area for coagulating sedimentation basin, adjusting pH is 4, and agitating device forms circulation by stirring promotion and uniformly mixes medicament with waste water
It closes, Fe3+Fe (OH) is formed with hydroxide ion3Precipitating completes precipitating in settling zone；
Precipitate in alkali cleaning pond Step 3: the waste water by step 2 enters: the probe in coagulation area is by the pH of waste water with anti-
PLC controller is reflected, PLC controller controls the switch of metering pump to guarantee that the pH of waste water in coagulation area is maintained at 11-13, precipitates
The supernatant overflow in area enters in the coagulation area in alkali cleaning pond, and the sodium hydroxide in grug feeding jar is added to the mixed of alkali cleaning pond by metering pump
In coagulation zone, adjust pH to 9, agitating device forms circulation and uniformly mixes medicament with waste water by stirring to be promoted, zinc, nickel ion and
Hydroxide ion forms Ni (OH)2Precipitating and Zn (OH)2Precipitating continues to add excess base, adjust pH to 12, Zn (OH)2It precipitates molten
Solution stays 2 sediment of Ni (OH) in water to complete to precipitate in settling zone；
Step 4: the waste water by step 3 enters in neutralization pond, the probe in coagulation area is by the pH of waste water to reflect
In PLC controller, PLC controller controls the switch of metering pump to guarantee that the pH of waste water in coagulation area is maintained at 8-10, settling zone
Supernatant overflow in the coagulation area of neutralization pond, the hydrochloric acid in grug feeding jar is added in the coagulation area of neutralization pond by metering pump,
Excess base is neutralized, pH to 9 is adjusted, zinc ion and hydroxide ion form Zn (OH)2Precipitating completes precipitating, quilt in settling zone
Inclined plate is retained down, and water outlet is discharged through outlet pipe.
The step 3, supernatant needs to enter alkali cleaning pond after precipitation of iron ions, adds that zinc after alkali, that nickel ion is formed is heavy
It forms sediment, Zn (OH)2A kind of amphoteric compound, dissolve in acid or alkali, add excess base make zinc ion precipitating dissolution, available nickel from
Son precipitating, the supernatant containing zinc ion enter in the coagulation area of neutralization pond, add acid for adjusting pH that zinc ion is made to re-form precipitating.
Earthenware slab film Inlet and outlet water form described in step 1 be outside into it is interior go out, material is aluminium oxide, and aperture is 0.1 μm, can
Handle waste water pH range be 2~12, particle removal rate >=95%, flux 50LMH, the method for operation be 9.5min suction/
0.5min backwash, for Membrane cleaning by the way of on-line cleaning, backwash combines aeration cleaning film.
The beneficial effects of the present invention are:
(1) raw water is by earthenware slab membrane cisterna under the action of film filters, and removal efficiency can reach 95% or more, oil
Class removal rate is up to 99% or more, and for film after backwash plus aeration, film functional rehabilitation is normal.
(2) added 30% H in coagulative precipitation tank2O2By Fe2+It is oxidized to Fe3+, 50% NaOH is added to adjust the left side pH to 4
The right side, so that iron ion generates precipitating, the rate of recovery of iron ion is close to 99%, and purity is close to 80%；In alkali cleaning pond, add 50%
NaOH adjusts pH to 12 or so so that nickel ion generates precipitating, the rate of recovery of nickel ion close to 100%, purity is 80%~
95%；In neutralization pond, the HCL of 1mol/L is added to adjust pH to 9 or so, so that zinc ion generates precipitating, the rate of recovery of zinc ion is connect
Nearly 100%, purity is 85%~95%.
(3) water can be promoted the circulation to form water flow by three leaf spiral vertical mixing paddles in the coagulation area of coagulative precipitation tank,
So that the reaction in flocculation zone is more abundant, water is elevated, also unreacted drug is utilized again in water, the benefit of drug
Increased with rate, reduces drug consumption amount.
Detailed description of the invention:
Fig. 1 is earthenware slab membrane cisterna schematic diagram of the invention；
Fig. 2 is iron of the present invention, three kinds of zinc, nickel ion isolation recyclable device schematic diagrames；
Fig. 3 is the separating and reclaiming device schematic diagram of iron, zinc, nickel ion in coating wastewater of the present invention；
Fig. 4 is the separation and recovery processing method flow chart of iron, zinc, nickel ion in coating wastewater of the present invention.
In figure:
1, earthenware slab membrane cisterna
101, intake pump 102, earthenware slab membrane module 103, filtered water pump
104, valve 105, backwash pump 106, valve
107, aerator 108, aeration pump
2, coagulative precipitation tank
201, agitating device 202, agitating paddle 203, stirring motor
204, partition 205, flow guiding slit 206, sludge pipe
207, grug feeding jar 208, metering pump 209, grug feeding jar
210, metering pump 211, inclined plate 212, coagulation area
213, settling zone
3, alkali cleaning pond
301, agitating device 302, agitating paddle 303, stirring motor
304, partition 305, flow guiding slit 306, sludge pipe
307, grug feeding jar 308, metering pump 309, inclined plate
310, coagulation area 311, settling zone
4, neutralization pond
401, agitating device 402, agitating paddle 403, stirring motor
404, partition 405, flow guiding slit 406, sludge pipe
407, outlet pipe 408, grug feeding jar 409, metering pump
410, inclined plate 411, coagulation area 412, settling zone
501, PLC controller 502, probe 503, probe
504, it pops one's head in
Specific embodiment
Add in conjunction with processing method and processing device of the attached drawing to the separation and recovery of iron, zinc, nickel ion in coating wastewater of the invention
With explanation.
As shown in Fig. 1~2, iron in coating wastewater of the invention, zinc, nickel ion separating and reclaiming device include earthenware slab
It membrane cisterna 1, coagulative precipitation tank 2, alkali cleaning pond 3, neutralization pond 4 and is sequentially communicated.
The water inlet of the earthenware slab membrane cisterna 1 is connect by pipeline with water pump 101, and earthenware slab membrane module is equipped in pond
102,102 top of earthenware slab membrane module is sequentially connected valve 104 and filtered water pump 103 by pipeline, is controlled by valve 104
The pumping of filtered water pump 103 is cut off the water, and the subsequent pipeline of filtered water pump 103 is connect with coagulative precipitation tank 2；Earthenware slab membrane module 102
Top is also sequentially connected valve 106 and backwash pump 105 by pipeline, and 1 bottom of earthenware slab membrane cisterna is equipped with aerator 107
Aeration pump 108 is connected by pipeline.
The coagulative precipitation tank 2 is connect by pipeline with filtered water pump 103, and it is mixed that partition 204, which divides coagulative precipitation tank 2,
213 two parts of coagulation zone 212 and settling zone, coagulation area 212 is interior to be equipped with agitating device 201 and by agitating paddle 202 and pond top
Stirring motor 203 connects, and promotes mixed liquor formation circulation by stirring and uniformly mixes medicament with waste water, hydrogen peroxide grug feeding jar
207 connection metering pumps 208 are connected in coagulation area 212 by pipeline, and sodium hydroxide grug feeding jar 209 connects metering pump 210 and passes through
Pipeline is connected in coagulation area 212, and flow guiding slit 205, coagulation area 212 and settling zone 213 are formed between partition 204 and inclined plate 211
It is connected to through flow guiding slit 205, bottom of pond portion is equipped with sludge pipe 206；
The water inlet in the alkali cleaning pond 3 is come by 213 overflow of settling zone of coagulative precipitation tank 2, and partition 304 is by alkali cleaning pond 3
It is divided into 311 two parts of coagulation area 310 and settling zone, agitating device 301 is equipped in coagulation area 310 and passes through agitating paddle 302 and pond
The stirring motor 303 on top connects, and sodium hydroxide grug feeding jar 307 connects metering pump 308 and is connected to coagulation area 310 by pipeline
It is interior, flow guiding slit 305 is formed between partition 304 and inclined plate 309, coagulation area 310 is connect with settling zone 311 through flow guiding slit 305, bottom of pond
Portion is equipped with sludge pipe 306；
The water inlet of neutralization pond 4 is come by 311 overflow of settling zone in alkali cleaning pond 3, passes through partition 404 in pond for alkali cleaning pond
It is divided into 412 two parts of coagulation area 411 and settling zone, agitating device 401 is equipped in coagulation area 411 and passes through agitating paddle 402 and pond
The stirring motor 403 on top connects, and hydrochloric acid grug feeding jar 407 connects metering pump 408 and is connected in coagulation area 411 by pipeline, every
Flow guiding slit 405 is formed between plate 404 and inclined plate 410, coagulation area 411 is connect with settling zone 412 through flow guiding slit 405, and bottom of pond portion is set
There is sludge pipe 406, water outlet is discharged by outlet pipe 407；The PLC controller 5 connects three probes, and it is heavy to be individually positioned in coagulation
Shallow lake pond 2, alkali cleaning pond 3 in neutralization precipitation pond 4, are monitored water quality condition, PLC controller 5 is also connected with all meterings of dosing
Pump and aeration pump 108.
The earthenware slab membrane cisterna 1 is first pre-processed using it, and 95% or more suspended matter and 99% is fallen in retention
Above paint substance etc..Waste water is pumped into earthenware slab membrane cisterna 1, driven by pressure, raw water effluent in membrane tube or outside film
Dynamic, small-molecule substance or penetration by liquid film, macromolecular substances or solid are rejected by, and are crossed drainage and are passed through by the control of valve 104
Water-filtering pump 103 enters coagulative precipitation tank 2, and earthenware slab membrane module 102 is also connected with Backwash pipeline, is passed through by valve control 106
Backwash pump 105 is pumped into backwashing water and cleans to membrane module, and bottom of pond is equipped with aerator 107 and connects aeration pump 108, matches
Close backwashing water rinsing membrane module.Earthenware slab film Inlet and outlet water form be outside into it is interior go out, material is aluminium oxide, and aperture is 0.1 μm,
Can handle waste water pH range be 2~12, particle removal rate >=95%, flux 50LMH, the method for operation be 9.5min suction/
0.5min backwash, for Membrane cleaning by the way of on-line cleaning, backwash combines aeration cleaning film.
Hydrogen peroxide in grug feeding jar 207 is added to coagulative precipitation tank 2 by the coagulative precipitation tank 2, metering pump 208
In coagulation area 212, by Fe2+It is oxidized to Fe3+, the sodium hydroxide in grug feeding jar 209 is added to coagulative precipitation tank 2 by metering pump 210
Coagulation area 212 in, adjusting pH is 4, and agitating device 201 forms circulation and uniformly mix medicament with waste water by stirring to be promoted,
Fe3+Fe (OH) is formed with hydroxide ion3Precipitating completes precipitating in settling zone 213；The supernatant overflow of settling zone 213 into
Enter in the coagulation area 310 in alkali cleaning pond 3.
Sodium hydroxide in grug feeding jar 307 is added to the coagulation area in alkali cleaning pond 3 by the alkali cleaning pond 3, metering pump 308
In 310, pH to 9 is adjusted, agitating device 301 forms circulation by stirring promotion and uniformly mixes medicament with waste water, zinc, nickel ion
Ni (OH) is formed with hydroxide ion2Precipitating and Zn (OH)2Precipitating continues to add excess base, adjust pH to 12, Zn (OH)2It precipitates molten
Solution, stays Ni (OH) in water2Sediment is completed to precipitate in settling zone 311；The supernatant of settling zone 311 overflows to neutralization pond 4
Coagulation area 411 in.
Hydrochloric acid in grug feeding jar 408 is added in the coagulation area 411 of neutralization pond 4 by 4 metering pump 409 of neutralization pond,
Excess base is neutralized, pH to 9 is adjusted, zinc ion and hydroxide ion form Zn (OH)2Precipitating completes precipitating in settling zone 412,
It is retained down by inclined plate 410, water outlet is discharged through outlet pipe 407.
The PLC controller 501 is connected with probe 502 in the coagulation area 212 of coagulative precipitation tank 2, monitors in waste water
PH value and ferrous ion content, if pH value > 4, PLC controller 501 will control sodium hydroxide grug feeding jar 209 on meter
Amount 210 dosings of pump maintain pH 4 or so, if pH < 3.5, stops dosing；If occurring ferrous ion in waste water, PLC control
Device 501 will control 208 dosing of metering pump on hydrogen peroxide grug feeding jar 207, by Fe2+It is oxidized to Fe3+If without ferrous ion,
Then stop dosing.PLC controller 501 is equipped with probe 503 in the coagulation area 310 in alkali cleaning pond 3, monitors the pH value in waste water, pH
< 12, PLC controller 501 maintains pH 12 or so for 308 dosing of metering pump on sodium hydroxide grug feeding jar 307 is controlled, if pH
> 12, then stop dosing.PLC controller 501 is equipped with probe 504 in the coagulation area 411 of neutralization pond 4, monitors the pH in waste water
Value, pH < 8.5, PLC controller 501 will control 409 dosing of metering pump on sodium hydroxide grug feeding jar 408 and maintain pH 9 or so,
If pH > 9, stops dosing.
All agitating paddles are made of using three-bladed propeller three curved blades, in addition to by water and medicine
Object quickly stirs evenly outer, it also acts as the effect for promoting water, circulates water in coagulation area, this vertical to stir
Paddle is mixed compared with the agitating paddle of plane, advantage is drug can be made to play one's part to the full, and avoids wasting, and reduces the consumption of drug
Amount.
Case study on implementation
Process object: coating wastewater, the iron concentration of the sewage are 188.89mg/L, zinc ion concentration 232mg/L, nickel
Ion concentration 83mg/L, pH=2.18, concentration of suspension 100.2mg/L, grease concentration 301mg/L.
(1) earthenware slab membrane cisterna removes suspended material and oils in water removal
Coating wastewater raw water is pumped to earthenware slab membrane cisterna 1, and driven by pressure, raw water enters earthenware slab film by outside
It is interior, it is flowed in membrane tube or on the outside of film, small-molecule substance or penetration by liquid film, macromolecular substances or solid are rejected by, filtering
Water enters coagulative precipitation tank 2 by filtered water pump 103 by the control of valve 104, and film top is also connected with Backwash pipeline, by valve control
System 106 is pumped into backwashing water by backwash pump 105 and cleans to film, and bottom of pond is equipped with aerator 107 and connects aeration pump
108, cooperation backwashing water cleans film.95% or more suspended particulate substance and 99% or so oily substance are gone in water
It removes.
(2) iron ion in coagulative precipitation tank recycle-water
30% hydrogen peroxide in grug feeding jar 207 is added in coagulative precipitation tank 2 by metering pump (208), by Fe2+It is oxidized to
Fe3+, 50% sodium hydroxide in grug feeding jar 209 is added in coagulative precipitation tank 2 by metering pump 210, and adjusting pH is 4, stirring dress
It sets 201 uniformly to mix medicament with waste water, waste water enters flow guiding slit 205, and precipitation of iron ions is retained down by inclined plate.Iron ion
The rate of recovery close to 99%, the purity of iron ion nearly 80%.
(3) nickel ion in the recycle-water of alkali cleaning pond
Supernatant overflow after coagulating sedimentation, which enters in alkali cleaning pond 3, to be continued to add alkali, and metering pump 308 will be in grug feeding jar 307
50% sodium hydroxide is added in alkali cleaning pond 3, adjusts pH to 9, and zinc, nickel ion precipitate, Zn (OH)2It is a kind of both sexes chemical combination
Object dissolves in acid or alkali, continues plus excess base, adjusts pH to 12, zinc ion precipitating dissolution, waste water enter 305 nickel of flow guiding slit from
Sub- sediment is retained down by inclined plate.For the rate of recovery of nickel ion close to 100%, nickel ion purity is 80%~95%.
(4) zinc ion in neutralization pond recycle-water
Treated in alkali cleaning pond 3, and supernatant enters in neutralization pond 4, and metering pump 409 is by the 1mol/L salt in grug feeding jar 408
Acid is added in alkali cleaning pond 3, neutralizes excess base, adjusts pH to 9, and waste water flows into flow guiding slit 405, and zinc ion sediment is cut by inclined plate
It stays, water outlet is discharged through outlet pipe 407.For the rate of recovery of zinc ion close to 99%, zinc ion purity is 85%~95%.
Claims (8)
1. a kind of processing equipment for recycling of heavy metal ions in wastewater, it is characterized in that: including the earthenware slab film being sequentially connected to
Pond (1), coagulative precipitation tank (2), alkali cleaning pond (3), neutralization pond (4) and PLC controller (501), the earthenware slab membrane cisterna (1) are interior
Bottom is equipped with aeration pump (108)；The coagulative precipitation tank (2), is respectively equipped with coagulation area and heavy in neutralization pond (4) at alkali cleaning pond (3)
Shallow lake area, the coagulation area are equipped with agitating device and chemicals dosing plant；The PLC controller (501), which is respectively equipped with, protrudes into the coagulation
Sedimentation basin (2), alkali cleaning pond (3), neutralization pond (4) interior stirring area monitoring probe and with the chemicals dosing plant, aeration pump (108) electricity
Connection.
2. the processing equipment for recycling of a kind of heavy metal ions in wastewater according to claim 1, it is characterized in that: described mixed
Solidifying sedimentation basin (2) are connected to by the way that the side wall to connect with alkali cleaning pond (3) is low with alkali cleaning pond (3), the alkali cleaning pond (3) by with neutralization
The side wall bottom that pond (4) connects is connected to neutralization pond (4).
3. the processing equipment for recycling of a kind of heavy metal ions in wastewater according to claim 1 or 2, it is characterized in that: institute
The water inlet for the earthenware slab membrane cisterna (1) stated is connect by pipeline with water pump (101), is equipped with earthenware slab membrane module (102) in pond,
Earthenware slab membrane module (102) top is sequentially connected valve (104) and filtered water pump (103) by pipeline, passes through valve (104)
The pumping of control filtered water pump (103) is cut off the water, and filtered water pump (103) subsequent pipeline is connect with coagulative precipitation tank (2)；Earthenware slab
Membrane module (102) top is also sequentially connected valve (106) and backwash pump (105), earthenware slab membrane cisterna (1) bottom by pipeline
Portion is equipped with aerator (107) and connects aeration pump (108) by pipeline；
The coagulative precipitation tank (2) is connect by pipeline with filtered water pump (103), and partition (204) divides coagulative precipitation tank (2)
For coagulation area (212) and settling zone (213) two parts, it is equipped with agitating device (201) in coagulation area (212) and passes through agitating paddle
(202) it is connect with the stirring motor on pond top (203), hydrogen peroxide grug feeding jar (207) connects metering pump (208) and connected by pipeline
It is connected in coagulation area (212), sodium hydroxide grug feeding jar (209) connects metering pump (210) and is connected to coagulation area (212) by pipeline
It is interior, flow guiding slit (205) are formed between partition (204) and inclined plate (211), coagulation area (212) and settling zone (213) are through flow guiding slit
(205) it connects, bottom of pond portion is equipped with sludge pipe (206)；
The water inlet in the alkali cleaning pond (3) is come by settling zone (213) overflow of coagulative precipitation tank (2), and partition (304) is by alkali cleaning
Pond (3) is divided into coagulation area (310) and settling zone (311) two parts, and agitating device (301) are equipped in coagulation area (310) and are passed through
Agitating paddle (302) is connect with the stirring motor (303) on pond top, and sodium hydroxide grug feeding jar (307) connection metering pump (308) passes through
Pipeline is connected in coagulation area (310), forms flow guiding slit (305) between partition (304) and inclined plate (309), coagulation area (310) and
Settling zone (311) is connected through flow guiding slit (305), and bottom of pond portion is equipped with sludge pipe (306)；
Neutralization pond (4) water inlet is come by settling zone (311) overflow of alkali cleaning pond (3), passes through partition (404) in pond for alkali
Wash pool is divided into coagulation area (411) and settling zone (412) two parts, agitating device (401) is equipped in coagulation area (411) and by stirring
It mixes paddle (402) to connect with the stirring motor (403) on pond top, hydrochloric acid grug feeding jar (407) connects metering pump (408) and connects by pipeline
It is connected in coagulation area (411), forms flow guiding slit (405) between partition (404) and inclined plate (410), coagulation area (411) and settling zone
(412) it is connected through flow guiding slit (405), bottom of pond portion is equipped with sludge pipe (406), and water outlet is discharged by outlet pipe (407)；The PLC
Controller (501) is electrically connected with each metering pump of chemicals dosing plant.
4. the processing equipment for recycling of a kind of heavy metal ions in wastewater according to claim 3, it is characterized in that: through ceramics
The filtered drainage excessively of plate membrane cisterna (1) enters coagulative precipitation tank (2) by filtered water pump (103) by valve (104) control, institute
It states earthenware slab membrane module (102) and is also connected with Backwash pipeline, be pumped by valve control (106) by backwash pump (105)
Backwashing water cleans membrane module.
5. the processing equipment for recycling of a kind of heavy metal ions in wastewater according to claim 1, it is characterized in that: described
Agitating device uses three-bladed propeller, and the blade of the three-bladed propeller is that three camber blades are formed, and water is quick with drug
It stirs evenly and is lifted up water, circulate water in coagulation area.
6. a kind of processing method of the recycling unit of heavy metal ions in wastewater according to claim 1, characterized in that
The following steps are included:
Step 1: waste water filtering in earthenware slab membrane cisterna (1): raw water is pumped into earthenware slab membrane cisterna by intake pump (101)
(1), under the swabbing action of filtered water pump (103), waste water flows through pipeline through film and enters in coagulative precipitation tank (2), oils,
SS impurity is trapped within earthenware slab membrane module (102) surface；When being cleaned to membrane module, in backwash pump (105)
Under effect, clear water is pumped into earthenware slab membrane module (102) inside, while the bubble for cooperating aerator (107) to generate will
The substance for being attached to earthenware slab membrane module (102) surface washes；
Step 2: the waste water outflow by step 1 enters precipitating in coagulative precipitation tank (2): by the spy in coagulation area (212)
The concentration of the pH of waste water and ferrous ion is reflected in PLC controller (501) that PLC controller (501) is controlled by head (502)
The switch of metering pump (208) processed and metering pump (210) makes the pH of coagulation area (212) interior waste water be maintained at 3-5, and ferrous ion
It disappears, then the hydrogen peroxide in grug feeding jar (207) is added to the coagulation area (212) of coagulative precipitation tank (2) by metering pump (208)
In, by Fe2+It is oxidized to Fe3+, the sodium hydroxide in grug feeding jar (209) is added to coagulative precipitation tank (2) by metering pump (210)
In coagulation area (212), adjusting pH is 4, and agitating device (201) forms circulation by stirring promotion and uniformly mixes medicament with waste water
It closes, Fe3+Fe (OH) is formed with hydroxide ion3Precipitating completes precipitating in settling zone (213)；
Step 3: the waste water by step 2 enters precipitating in alkali cleaning pond (3): probe (503) in coagulation area (310) is by waste water
PH to reflect in PLC controller (501), the switch of PLC controller (501) control metering pump (308) guarantees coagulation area
(212) pH of interior waste water is maintained at 11-13, and the supernatant overflow of settling zone (213) enters the coagulation area (310) in alkali cleaning pond (3)
In, the sodium hydroxide in grug feeding jar (307) is added in the coagulation area (310) in alkali cleaning pond (3) by metering pump (308), adjusts pH
To 9, agitating device (301) forms circulation and uniformly mixes medicament with waste water by stirring to be promoted, zinc, nickel ion and hydroxyl from
Son formation Ni (OH) 2 precipitating and Zn (OH) 2 are precipitated, and continue plus excess base, the adjusting precipitating dissolution of pH to 12, Zn (OH) 2 stay in water
In 2 sediment of Ni (OH) settling zone (311) complete precipitate；
Step 4: the waste water by step 3 enters in neutralization pond (4), the probe (504) in coagulation area (411) is by the pH of waste water
With in reflection to PLC controller (501), PLC controller (501) controls the switch of metering pump (409) to guarantee coagulation area (212)
The pH of interior waste water is maintained at 8-10, and the supernatant of settling zone (311) overflows in the coagulation area (411) of neutralization pond (4), metering pump
(409) hydrochloric acid in grug feeding jar (408) is added in the coagulation area (411) of neutralization pond (4), neutralizes excess base, adjusted pH and arrive
9, zinc ion and hydroxide ion form Zn (OH)2Precipitating completes precipitating in settling zone (412), by under inclined plate (410) retention
Come, water outlet is discharged through outlet pipe (407).
7. the processing method of the recycling of heavy metal ions in wastewater according to claim 6, it is characterized in that: the step
Rapid three, supernatant needs to enter alkali cleaning pond (3) after precipitation of iron ions, and zinc after alkali, nickel ion is added to form precipitating, Zn (OH)2It is
A kind of amphoteric compound dissolves in acid or alkali, and excess base is added to make zinc ion precipitating dissolution, and available nickel ion precipitating contains zinc
The supernatant of ion enters in the coagulation area (411) of neutralization pond (4), adds acid for adjusting pH that zinc ion is made to re-form precipitating.
8. the processing method of the recycling of heavy metal ions in wastewater according to claim 6, it is characterized in that: step 1
The earthenware slab film Inlet and outlet water form be outside into it is interior go out, material is aluminium oxide, and aperture is 0.1 μm, can handle the pH model of waste water
Enclosing is 2~12, particle removal rate >=95%, flux 50LMH, and the method for operation is 9.5min suction/0.5min backwash, and film is clear
It washes by the way of on-line cleaning, backwash combines aeration cleaning film.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811171428.7A CN109110976A (en) | 2018-10-08 | 2018-10-08 | The recycling processing method and device of heavy metal ions in wastewater |
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| CN201811171428.7A CN109110976A (en) | 2018-10-08 | 2018-10-08 | The recycling processing method and device of heavy metal ions in wastewater |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110756512A (en) * | 2019-11-26 | 2020-02-07 | 雅安沃克林环保科技有限公司 | Micron-level high-hardness powder cleaning and separating system and method |
| CN110841370A (en) * | 2019-11-12 | 2020-02-28 | 苏州仕净环保科技股份有限公司 | High-efficient effluent treatment plant |
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| JP2002192168A (en) * | 2000-12-27 | 2002-07-10 | Nippon Steel Corp | Method for separating and recovering nickel and zinc from nickel and zinc-containing wastewater or sludge |
| CN104291483A (en) * | 2014-09-22 | 2015-01-21 | 江苏久吾高科技股份有限公司 | Treatment method and device of ionic rare-earth mine wastewater by employing membrane separation technology |
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| JP2002192168A (en) * | 2000-12-27 | 2002-07-10 | Nippon Steel Corp | Method for separating and recovering nickel and zinc from nickel and zinc-containing wastewater or sludge |
| CN104291483A (en) * | 2014-09-22 | 2015-01-21 | 江苏久吾高科技股份有限公司 | Treatment method and device of ionic rare-earth mine wastewater by employing membrane separation technology |
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| CN110841370A (en) * | 2019-11-12 | 2020-02-28 | 苏州仕净环保科技股份有限公司 | High-efficient effluent treatment plant |
| CN110841370B (en) * | 2019-11-12 | 2023-09-26 | 苏州仕净科技股份有限公司 | High-efficient effluent treatment plant |
| CN110756512A (en) * | 2019-11-26 | 2020-02-07 | 雅安沃克林环保科技有限公司 | Micron-level high-hardness powder cleaning and separating system and method |
| CN110756512B (en) * | 2019-11-26 | 2021-09-24 | 雅安沃克林环保科技有限公司 | Micron-level high-hardness powder cleaning and separating system and method |
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