CN109250847A - It is concisely and efficiently nickel-containing waste water pretreatment unit and technique - Google Patents
It is concisely and efficiently nickel-containing waste water pretreatment unit and technique Download PDFInfo
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- CN109250847A CN109250847A CN201811374032.2A CN201811374032A CN109250847A CN 109250847 A CN109250847 A CN 109250847A CN 201811374032 A CN201811374032 A CN 201811374032A CN 109250847 A CN109250847 A CN 109250847A
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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
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
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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
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
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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
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or 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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
- C02F2201/4612—Controlling or monitoring
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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
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
- C02F2201/4612—Controlling or monitoring
- C02F2201/46125—Electrical variables
- C02F2201/4614—Current
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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
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
- C02F2201/4612—Controlling or monitoring
- C02F2201/4615—Time
-
- 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
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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)
- Water Treatment By Electricity Or Magnetism (AREA)
- Treatment Of Water By Ion Exchange (AREA)
Abstract
The invention discloses one kind to be concisely and efficiently nickel-containing waste water pretreatment unit and technique, including storage pool, counter-infiltration system, sedimentation basin, pH conditioning tank, ion exchange pond and electrolytic cell, the storage pool includes concentrate storage pool and waste liquid storage pool, the concentrate storage pool includes the first concentration storage pool and the second concentration storage pool, the waste liquid storage pool is connect by the counter-infiltration system with the first concentrate storage pool, the first concentrate storage pool is connect with the sedimentation basin, the sedimentation basin is connect by active carbon filtering ponds with the ion exchange pond, the ion exchange pond is connect with the second concentrate storage pool, the second concentrate storage pool is connect by the pH conditioning tank with the electrolytic cell.The present invention using the above structure be concisely and efficiently nickel-containing waste water pretreatment unit and technique, accomplish zero-emission at nickel-plating waste water end, not only reduced the production cost of plating, but also reduce electroplating sewerage discharge.
Description
Technical field
The present invention relates to technical field of waste water processing, are concisely and efficiently nickel-containing waste water pretreatment unit more particularly to one kind
And technique.
Background technique
Chemical nickel plating is the amorphous deposit generated with collective effects such as nickel salt and hypophosphites, is at a kind of surface in forward position
Reason technology is widely used in the fields such as electronics, petroleum, computer and automobile.With the continuous extension of electroless plating time, solution
In by-products such as sulfite ion when reaching a certain concentration, chemical plating solution can Auto-decomposition, metal-phosphor alloy coating
Deposition is affected, and the decline of the performances such as wearability of coating causes to discard, forms chemical nickel waste liquid.Chemical nickel waste component is multiple
It is miscellaneous, other than nickel ion, also containing a large amount of complexing agent, such as citric acid, tartaric acid, sodium hypophosphite etc. in waste water.Nickel ion
Stable high-concentration hardly-degradable industrial wastes is formed with combinations such as complexing agents, is difficult through traditional chemical contact break and intermediate processing
It completely removes.Meanwhile containing the higher hypophosphorous acid root of content and orthophosphite ions in chemical nickel plating waste solution, it is untreated to draw
Play water eutrophication.
As environmental protection is increasingly stringenter requirement, wanted for electroplating industry to what nickel-containing waste water discharge standard was increasingly stringenter
It asks.Factory's traditional waste water treatment process can not meet environmental requirement, and cannot voluntarily handle, some factories just select outgoing to have qualification
Environmental protection administration contract, but outgoing contracts and not only has not a particle of economic benefit and also to pay commission Contract cost, produces volume
Outer production cost.
Currently used processing nickel-containing waste water method is chemical precipitation method, i.e., adjusts nickel-containing waste water pH value value with lime, and
Add neutralizations, coagulation, flocculation, the precipitatings such as metal supplementary set agent.In addition there are ion-exchange, absorption method, electroosmose process, evaporation and concentration
Method and reverse osmosis method etc..Chemical nickel plating due to the ingredient in waste water it is complex because treatment effect is limited.
Summary of the invention
The object of the present invention is to provide one kind to be concisely and efficiently nickel-containing waste water pretreatment unit and technique, at nickel-plating waste water end
Accomplish zero-emission, not only reduced the production cost of plating, but also reduces electroplating sewerage discharge.
To achieve the above object, the present invention provides one kind to be concisely and efficiently nickel-containing waste water pretreatment unit, including storage
Pond, counter-infiltration system, sedimentation basin, pH conditioning tank, ion exchange pond and electrolytic cell, the storage pool include concentrate storage pool and
Waste liquid storage pool, the concentrate storage pool include the first concentration storage pool and the second concentration storage pool, the waste liquid storage pool
It is connect by the counter-infiltration system with the first concentrate storage pool, the first concentrate storage pool and the sedimentation basin
Connection, the sedimentation basin are connect by active carbon filtering ponds with the ion exchange pond, the ion exchange pond and described second
The connection of concentrate storage pool, the second concentrate storage pool are connect by the pH conditioning tank with the electrolytic cell.
Preferably, pH meter and agitating device are equipped in the pH conditioning tank, the agitating device includes stirring rod, is set to institute
State the paddle on stirring rod and the driving motor to drive the stirring rod rotation.
Preferably, the ion exchange pond includes tank ontology, in the tank ontology be filled with resin, the two of the tank ontology
Side is respectively equipped with inlet and outlet, and water conservancy diversion is equipped between the water inlet and the water outlet in the tank ontology
Plate, the top of the resin container are equipped with feeding port, and the bottom of the resin container is equipped with drain hole.
A kind for the treatment of process being concisely and efficiently nickel-containing waste water pretreatment unit, steps are as follows:
1) it stocks up: the chemical nickel waste liquid of collection is placed in waste liquid storage pool；
2) reverse osmosis treatment: chemical nickel waste water is handled using counter-infiltration system, respectively obtains clear water and muddy water, clear water flows into
Tap water reuse slot, muddy water inject the first concentrate storage pool；
3) alkaline chemical precipitation: nickeliferous concentration waste water is injected into sedimentation basin, alkaline solution is added in sedimentation basin, is adjusted nickeliferous
The pH value range of waste water is 12.0 or more, is mixed and is reacted, staticly settled in sedimentation basin, obtains lower layer's pulp water and upper layer
Clear liquid；
4) filtering and concentrating: the nickel-containing waste water of lower layer's pulp water active carbon filtration pond is filtered, using ion exchange pond mistake
Filter obtains recyclable recycle-water and nickeliferous sewage concentration liquid, recycles, contain in recycle-water injection tap water reuse slot
Nickel sewage concentration liquid injects the second concentrate storage pool；
5) pH conditioning tank: the second concentrate storage pool is injected in pH conditioning tank, and adjusts its pH value；
6) it electrolytic cell: will be electrolysed in the deployed waste water injection electrolytic cell of pH value, the elemental nickel that recycling electrolysis is precipitated is adjusted
Electrolysis time is saved, so that threshold value of the nickel content of electrolysis processed waste water lower than setting.
Preferably, the pH value of the mixing liquid in nickel-containing waste water pH conditioning tank is adjusted to 6~7 in step (5).
Preferably, the temperature being electrolysed in step (6) is set in 67-71 DEG C, and current density when electrolysis is 1.2~
1.4ASD, the time of electrolytic process are 6.4-7.8 hours.
Therefore, the present invention using the above structure be concisely and efficiently nickel-containing waste water pretreatment unit and technique, it is useless in nickel plating
Water end (W.E.) accomplishes zero-emission, has not only reduced the production cost of plating, but also reduces electroplating sewerage discharge.
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Detailed description of the invention
Fig. 1 is the schematic diagram that the present invention is concisely and efficiently nickel-containing waste water pretreatment unit and process example.
Specific embodiment
Embodiments of the present invention are described further with reference to the accompanying drawing.
Fig. 1 is the schematic diagram that the present invention is concisely and efficiently nickel-containing waste water pretreatment unit and process example, as shown,
One kind being concisely and efficiently nickel-containing waste water pretreatment unit, including storage pool, counter-infiltration system, sedimentation basin, pH conditioning tank, ion are handed over
Pond and electrolytic cell are changed, storage pool includes concentrate storage pool and waste liquid storage pool, and concentrate storage pool includes the first concentration storage
Pond and the second concentration storage pool, waste liquid storage pool are connect by counter-infiltration system with the first concentrate storage pool, the first concentrate
Storage pool is connect with sedimentation basin, and sedimentation basin is connect by active carbon filtering ponds with ion exchange pond, ion exchange pond and second dense
The connection of contracting liquid storage pool, the second concentrate storage pool are connect by pH conditioning tank with electrolytic cell.
PH meter and agitating device are equipped in pH conditioning tank, agitating device includes stirring rod, the paddle on stirring rod
And the driving motor to drive stirring rod to rotate.
Ion exchange pond includes tank ontology, is filled with resin in tank ontology, the two sides of tank ontology be respectively equipped with water inlet and
Water outlet, tank ontology is interior to be equipped with deflector between inlet and outlet, and the top of resin container is equipped with feeding port, resin container
Bottom be equipped with drain hole.
A kind for the treatment of process being concisely and efficiently nickel-containing waste water pretreatment unit, steps are as follows:
1) it stocks up: the chemical nickel waste liquid of collection is placed in waste liquid storage pool；
2) reverse osmosis treatment: chemical nickel waste water is handled using counter-infiltration system, respectively obtains clear water and muddy water, clear water flows into
Tap water reuse slot, muddy water inject the first concentrate storage pool；
3) alkaline chemical precipitation: nickeliferous concentration waste water is injected into sedimentation basin, alkaline solution is added in sedimentation basin, is adjusted nickeliferous
The pH value range of waste water is 12.0 or more, is mixed and is reacted, staticly settled in sedimentation basin, obtains lower layer's pulp water and upper layer
Clear liquid；
4) filtering and concentrating: the nickel-containing waste water of lower layer's pulp water active carbon filtration pond is filtered, using ion exchange pond mistake
Filter obtains recyclable recycle-water and nickeliferous sewage concentration liquid, recycles, contain in recycle-water injection tap water reuse slot
Nickel sewage concentration liquid injects the second concentrate storage pool；
5) pH conditioning tank: the second concentrate storage pool is injected in pH conditioning tank, and adjusts its pH value；
The pH value of the mixing liquid in nickel-containing waste water pH conditioning tank is adjusted to 6~7 in step (5).
6) it electrolytic cell: will be electrolysed in the deployed waste water injection electrolytic cell of pH value, the elemental nickel that recycling electrolysis is precipitated is adjusted
Electrolysis time is saved, so that threshold value of the nickel content of electrolysis processed waste water lower than setting.
The temperature being electrolysed in step (6) is set in 67-71 DEG C, and current density when electrolysis is 1.2~1.4ASD, is electrolysed
The time of journey is 6.4-7.8 hours.
Therefore, the present invention using the above structure be concisely and efficiently nickel-containing waste water pretreatment unit and technique, it is useless in nickel plating
Water end (W.E.) accomplishes zero-emission, has not only reduced the production cost of plating, but also reduces electroplating sewerage discharge.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention rather than is limited,
Although the present invention is described in detail with reference to preferred embodiments, those skilled in the art should understand that: its according to
So can be with modification or equivalent replacement of the technical solution of the present invention are made, and these modifications or equivalent replacement cannot also make to repair
Technical solution after changing is detached from the spirit and scope of technical solution of the present invention.
Claims (6)
1. one kind is concisely and efficiently nickel-containing waste water pretreatment unit, it is characterised in that: including storage pool, counter-infiltration system, precipitating
Pond, pH conditioning tank, ion exchange pond and electrolytic cell, the storage pool include concentrate storage pool and waste liquid storage pool, described dense
Contracting liquid storage pool includes the first concentration storage pool and the second concentration storage pool, and the waste liquid storage pool passes through the counter-infiltration system
It is connect with the first concentrate storage pool, the first concentrate storage pool is connect with the sedimentation basin, and the sedimentation basin is logical
Active carbon filtering ponds to be crossed to connect with the ion exchange pond, the ion exchange pond is connect with the second concentrate storage pool,
The second concentrate storage pool is connect by the pH conditioning tank with the electrolytic cell.
2. one kind according to claim 1 is concisely and efficiently nickel-containing waste water pretreatment unit, it is characterised in that: the pH tune
Save in pond equipped with pH meter and agitating device, the agitating device include stirring rod, the paddle on the stirring rod and
To drive the driving motor of the stirring rod rotation.
3. one kind according to claim 2 is concisely and efficiently nickel-containing waste water pretreatment unit, it is characterised in that: the ion
Exchanging pond includes tank ontology, resin is filled in the tank ontology, the two sides of the tank ontology are respectively equipped with water inlet and water outlet
Mouthful, deflector is equipped in the tank ontology between the water inlet and the water outlet, the top of the resin container is equipped with
The bottom of feeding port, the resin container is equipped with drain hole.
4. a kind for the treatment of process for being concisely and efficiently nickel-containing waste water pretreatment unit according to claim 1, feature exist
In steps are as follows:
1) it stocks up: the chemical nickel waste liquid of collection is placed in waste liquid storage pool；
2) reverse osmosis treatment: chemical nickel waste water is handled using counter-infiltration system, respectively obtains clear water and muddy water, clear water flows into originally
Water reuse slot, muddy water inject the first concentrate storage pool；
3) alkaline chemical precipitation: nickeliferous concentration waste water is injected into sedimentation basin, alkaline solution is added in sedimentation basin, adjusts nickel-containing waste water
PH value range be 12.0 or more, mixed and reacted, staticly settled in sedimentation basin, obtained lower layer's pulp water and upper layer is clear
Liquid；
4) filtering and concentrating: the nickel-containing waste water of lower layer's pulp water active carbon filtration pond is filtered, filters, obtains using ion exchange pond
To recyclable recycle-water and nickeliferous sewage concentration liquid, recycle-water, which injects in tap water reuse slot, to be recycled, nickeliferous dirt
Concentrated liquid injects the second concentrate storage pool；
5) pH conditioning tank: the second concentrate storage pool is injected in pH conditioning tank, and adjusts its pH value；
6) it electrolytic cell: will be electrolysed in the deployed waste water injection electrolytic cell of pH value, the elemental nickel that recycling electrolysis is precipitated adjusts electricity
The time is solved, so that threshold value of the nickel content of electrolysis processed waste water lower than setting.
5. a kind for the treatment of process for being concisely and efficiently nickel-containing waste water pretreatment unit according to claim 4, feature exist
In: the pH value of the mixing liquid in nickel-containing waste water pH conditioning tank is adjusted to 6~7 in step (5).
6. a kind for the treatment of process for being concisely and efficiently nickel-containing waste water pretreatment unit according to claim 5, feature exist
The temperature being electrolysed in: step (6) is set in 67-71 DEG C, and current density when electrolysis is 1.2~1.4ASD, electrolytic process
Time is 6.4-7.8 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811374032.2A CN109250847A (en) | 2018-11-19 | 2018-11-19 | It is concisely and efficiently nickel-containing waste water pretreatment unit and technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811374032.2A CN109250847A (en) | 2018-11-19 | 2018-11-19 | It is concisely and efficiently nickel-containing waste water pretreatment unit and technique |
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| CN109250847A true CN109250847A (en) | 2019-01-22 |
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| CN201811374032.2A Pending CN109250847A (en) | 2018-11-19 | 2018-11-19 | It is concisely and efficiently nickel-containing waste water pretreatment unit and technique |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110372125A (en) * | 2019-07-24 | 2019-10-25 | 无锡市道格环保科技有限公司 | Difficult removal metal ion Integrated Processing Unit in a kind of waste water |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3378487A (en) * | 1965-10-13 | 1968-04-16 | Chaney Earl Jacob | Method of treating waste water containing nickel |
| DE2724724A1 (en) * | 1977-06-01 | 1978-12-07 | Nihon Filter Co Ltd | METHOD AND DEVICE FOR RECOVERY OF HEAVY METALS FROM WATER |
| CN101423309A (en) * | 2008-05-07 | 2009-05-06 | 厦门市闽发实业有限公司 | Electroplating waste and heavy metal double recovery method |
| CN104250046A (en) * | 2014-09-17 | 2014-12-31 | 郭套龙 | Nickel-containing wastewater treatment device and treatment method thereof |
| CN205838760U (en) * | 2016-07-08 | 2016-12-28 | 厦门科滤膜技术有限公司 | A kind of nickel-containing waste water processing system |
| CN108483747A (en) * | 2018-06-11 | 2018-09-04 | 湖南先瑞环境技术有限公司 | The removal of nickel and recovery system and method in a kind of nickel-containing waste water |
| CN108609810A (en) * | 2018-06-07 | 2018-10-02 | 江苏善鼎环保科技有限公司 | A kind of processing method and its processing system of chemistry nickel waste water |
-
2018
- 2018-11-19 CN CN201811374032.2A patent/CN109250847A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3378487A (en) * | 1965-10-13 | 1968-04-16 | Chaney Earl Jacob | Method of treating waste water containing nickel |
| DE2724724A1 (en) * | 1977-06-01 | 1978-12-07 | Nihon Filter Co Ltd | METHOD AND DEVICE FOR RECOVERY OF HEAVY METALS FROM WATER |
| CN101423309A (en) * | 2008-05-07 | 2009-05-06 | 厦门市闽发实业有限公司 | Electroplating waste and heavy metal double recovery method |
| CN104250046A (en) * | 2014-09-17 | 2014-12-31 | 郭套龙 | Nickel-containing wastewater treatment device and treatment method thereof |
| CN205838760U (en) * | 2016-07-08 | 2016-12-28 | 厦门科滤膜技术有限公司 | A kind of nickel-containing waste water processing system |
| CN108609810A (en) * | 2018-06-07 | 2018-10-02 | 江苏善鼎环保科技有限公司 | A kind of processing method and its processing system of chemistry nickel waste water |
| CN108483747A (en) * | 2018-06-11 | 2018-09-04 | 湖南先瑞环境技术有限公司 | The removal of nickel and recovery system and method in a kind of nickel-containing waste water |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110372125A (en) * | 2019-07-24 | 2019-10-25 | 无锡市道格环保科技有限公司 | Difficult removal metal ion Integrated Processing Unit in a kind of waste water |
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