CN112062341A - Comprehensive treatment method of heavy metal wastewater - Google Patents
Comprehensive treatment method of heavy metal wastewater Download PDFInfo
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- CN112062341A CN112062341A CN202010936360.8A CN202010936360A CN112062341A CN 112062341 A CN112062341 A CN 112062341A CN 202010936360 A CN202010936360 A CN 202010936360A CN 112062341 A CN112062341 A CN 112062341A
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- wastewater
- heavy metal
- frequency vibration
- flotation device
- air flotation
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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
- C02F1/44—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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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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
- C02F1/465—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electroflotation
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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
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic 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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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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)
- Physical Water Treatments (AREA)
Abstract
The invention relates to the technical field of wastewater treatment, in particular to a treatment method for comprehensive heavy metal wastewater. The method comprises the following steps: a) the heavy metal wastewater enters a regulating tank for stirring and pre-aeration treatment; b) electrolyzing the wastewater by using an electrolytic air flotation device, adding a flocculating agent and a heavy metal catching agent into the electrolytic air flotation device so as to remove heavy metals in the wastewater, then sending the wastewater into a sedimentation tank, and transporting sludge discharged by the electrolytic air flotation device; c) and separating sludge and supernatant in the sedimentation tank, filtering the supernatant in an ultra-frequency vibration UF system, and transporting the sludge outside. According to the invention, the electrolytic air flotation device is adopted to degrade organic matters in the wastewater, so that the COD removal efficiency is improved, and the dosage and the occupied area are reduced. And filtering and separating the water by using an ultra-frequency vibration UF membrane and an RO membrane to remove chroma and residual micromolecular pollutants in the water. This application has improved the waste water treatment effect, has practiced thrift the cost.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a treatment method for comprehensive heavy metal wastewater.
Background
The heavy metal wastewater is wastewater containing heavy metals discharged in the industrial production processes of mining and metallurgy, mechanical manufacturing, chemical industry, electronics, instruments and the like. Heavy metal (such as cadmium, nickel, mercury, zinc and the like) waste water is one of industrial waste water which has the most serious environmental pollution and the most serious harm to human, and the water quality and the water quantity of the waste water are related to a production process. Heavy metals in wastewater generally cannot be decomposed and destroyed, and only can be transferred to the existing position and converted into the physical and chemical forms. The treatment method is to reform the production process at first, heavy metals with high toxicity are not used or are less used, the treatment is carried out on the spot (if the heavy metals are not discharged from a production workshop) in a production place by adopting a chemical precipitation method, an ion exchange method and the like, and the heavy metals in the treated water can be discharged or recycled when the heavy metals are lower than the discharge standard. Form a new heavy metal concentrated product which can be recycled or treated harmlessly as much as possible. In the prior art, the process of the rapid coagulation reaction tank and the slow coagulation reaction tank is adopted to treat the wastewater and capture heavy metals in the wastewater, but the process has large floor area and low efficiency, and a large amount of medicament is required to be added for coagulation and flocculation precipitation of the heavy metals, so that the operation cost is obviously increased.
Disclosure of Invention
In order to solve the technical problems described in the background art, the invention provides a comprehensive heavy metal wastewater treatment method, an electrolytic air flotation device is adopted to degrade organic matters in wastewater, the COD removal efficiency is improved, and the dosage and the occupied area are reduced by the electrolytic air flotation device. And filtering and separating the water by using an ultra-frequency vibration UF membrane and an RO membrane to remove chroma and residual micromolecular pollutants in the water. This application has improved the waste water treatment effect, has practiced thrift the cost.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for treating comprehensive heavy metal wastewater comprises the following steps:
a) the heavy metal wastewater enters a regulating tank for stirring and pre-aeration treatment, and the treated wastewater is sent into an electrolytic air flotation device;
b) electrolyzing the wastewater by using an electrolytic air flotation device, adding a flocculating agent and a heavy metal catching agent into the electrolytic air flotation device so as to remove heavy metals in the wastewater, then sending the wastewater into a sedimentation tank, and transporting sludge discharged by the electrolytic air flotation device;
c) separating sludge and supernatant in the wastewater in a sedimentation tank, filtering the supernatant in an ultra-frequency vibration UF system, and transporting the sludge;
d) and (4) the wastewater filtered by the ultra-frequency vibration UF system is sent into an ultra-frequency vibration RO system for filtering, and finally, recyclable water is obtained.
Specifically, the flocculant is polyacrylamide.
Specifically, the ultra-frequency vibration UF system is composed of a high-frequency vibration exciter, an UF membrane and a pipe shell.
Specifically, the super-frequency vibration RO system is composed of a high-frequency vibration exciter, an RO membrane and a pipe shell.
The invention has the beneficial effects that: the invention provides a comprehensive heavy metal wastewater treatment method, which adopts an electrolytic air flotation device to degrade organic matters in wastewater, improves the COD removal efficiency, and reduces the dosage and the occupied area of the electrolytic air flotation device. And filtering and separating the water by using an ultra-frequency vibration UF membrane and an RO membrane to remove chroma and residual micromolecular pollutants in the water. This application has improved the waste water treatment effect, has practiced thrift the cost.
Drawings
The invention is further described with reference to the following figures and examples.
FIG. 1 is a schematic diagram of the framework of the present invention;
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams illustrating only the basic structure of the invention in a schematic manner, and thus show only the constitution related to the invention.
Fig. 1 is a schematic diagram of the framework of the present invention.
As shown in the attached figure 1, the method for treating the comprehensive heavy metal wastewater comprises the following steps:
a) the heavy metal wastewater enters a regulating tank for stirring and pre-aeration treatment, and the treated wastewater is sent into an electrolytic air flotation device;
b) electrolyzing the wastewater by using an electrolytic air flotation device, adding a flocculating agent and a heavy metal catching agent into the electrolytic air flotation device so as to remove heavy metals in the wastewater, then sending the wastewater into a sedimentation tank, and transporting sludge discharged by the electrolytic air flotation device;
c) separating sludge and supernatant in the wastewater in a sedimentation tank, filtering the supernatant in an ultra-frequency vibration UF system, and transporting the sludge;
d) and (4) the wastewater filtered by the ultra-frequency vibration UF system is sent into an ultra-frequency vibration RO system for filtering, and finally, recyclable water is obtained.
The flocculating agent is polyacrylamide.
The ultra-frequency vibration UF system consists of a high-frequency vibration exciter, an UF membrane and a pipe shell.
The super-frequency vibration RO system is composed of a high-frequency vibration exciter, an RO membrane and a tube shell.
The electrolytic air floating device directly electrolyzes the waste water by using an insoluble anode and a cathode and supplying direct current. The anode and the cathode generate hydrogen and oxygen micro-bubbles, pollutant particles in the wastewater or floccules formed by coagulation treatment are adhered and float to the water surface to generate a foam layer, and then the foam is scraped to realize the separation and removal of pollutants.
The ultra-frequency vibration UF system consists of a high-frequency vibration exciter, an UF membrane and a pipe shell. The vibration UF system vibrates the UF membrane through a high-frequency vibration exciter, so that strong shearing force and normal force are generated, solids and pollutants in the wastewater float from the surface of the membrane, concentrated water with a turbulent flow effect flows out of the membrane system, and the blockage of membrane pores is avoided.
The super-frequency vibration RO system vibrates the RO membrane through the high-frequency vibration exciter, so that strong shearing force and normal force are generated, solid and pollutants in waste water float from the surface of the membrane, and the membrane system is flowed out along with concentrated water forming a turbulent flow effect, so that the blockage of membrane pores is avoided.
The electrolysis air-floating device treats the wastewater, combines the advantages of electrolysis and air-floating technology, has a plurality of unique advantages as integrated equipment, reduces the dosage and the occupied area and the civil construction cost.
The bubbles generated by electrolysis are small, the diameter is 8-15 mu m, the contact area with impurities in the wastewater is large, and the adsorption capacity of the bubbles and floccules is strong. The gas production and bubble size can be changed by adjusting the current, electrode material, pH value and temperature to meet various requirements.
In the anode process, intermediate products are generated on the surface of the anode and have certain oxidation effect on organic matters. When chloride ions exist, the anode generates chlorine gas to have oxidation, and hypochlorite generated by chlorine gas hydrolysis also has oxidation, so that the anode has degradation effect on organic matters in the water body, and the COD removal efficiency is improved.
And the ultra-frequency vibration UF system and the ultra-frequency vibration RO system are used for filtering and separating, and mainly removing chroma and residual micromolecular pollutants in water. Compared with the traditional roll type static membrane, the ultra-frequency vibration membrane has the advantages of super-strong anti-fouling and anti-blocking performance, high membrane flux, long service life cycle, long cleaning cycle, low operation cost, compact structure, small occupied area and the like.
In light of the foregoing description of preferred embodiments according to the invention, many modifications and variations can be made by the worker skilled in the art without departing from the scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (4)
1. A treatment method of comprehensive heavy metal wastewater is characterized by comprising the following steps: the method comprises the following steps:
a) the heavy metal wastewater enters a regulating tank for stirring and pre-aeration treatment, and the treated wastewater is sent into an electrolytic air flotation device;
b) electrolyzing the wastewater by using an electrolytic air flotation device, adding a flocculating agent and a heavy metal catching agent into the electrolytic air flotation device so as to remove heavy metals in the wastewater, then sending the wastewater into a sedimentation tank, and transporting sludge discharged by the electrolytic air flotation device;
c) separating sludge and supernatant in the wastewater in a sedimentation tank, filtering the supernatant in an ultra-frequency vibration UF system, and transporting the sludge;
d) and (4) the wastewater filtered by the ultra-frequency vibration UF system is sent into an ultra-frequency vibration RO system for filtering, and finally, recyclable water is obtained.
2. The method for treating comprehensive heavy metal wastewater according to claim 1, which is characterized in that: the flocculant is polyacrylamide.
3. The method for treating comprehensive heavy metal wastewater according to claim 1, which is characterized in that: the ultra-frequency vibration UF system consists of a high-frequency vibration exciter, an UF membrane and a pipe shell.
4. The method for treating comprehensive heavy metal wastewater according to claim 1, which is characterized in that: the super-frequency vibration RO system is composed of a high-frequency vibration exciter, an RO membrane and a pipe shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010936360.8A CN112062341A (en) | 2020-09-08 | 2020-09-08 | Comprehensive treatment method of heavy metal wastewater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010936360.8A CN112062341A (en) | 2020-09-08 | 2020-09-08 | Comprehensive treatment method of heavy metal wastewater |
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| CN112062341A true CN112062341A (en) | 2020-12-11 |
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| CN202010936360.8A Pending CN112062341A (en) | 2020-09-08 | 2020-09-08 | Comprehensive treatment method of heavy metal wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115465998A (en) * | 2022-09-29 | 2022-12-13 | 常州市飞荣达电子材料有限公司 | Heavy metal wastewater treatment method and treatment equipment thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102964014A (en) * | 2012-11-15 | 2013-03-13 | 新疆德安环保科技有限公司 | Treatment method of acid heavy metal wastewater |
| CN207175662U (en) * | 2017-09-14 | 2018-04-03 | 辽宁石化职业技术学院 | The equipment of heavy metal in a kind of removal sewage |
| CN110526476A (en) * | 2019-09-25 | 2019-12-03 | 北京华电利源科技有限公司 | The method for handling comprehensive heavy metal wastewater thereby |
-
2020
- 2020-09-08 CN CN202010936360.8A patent/CN112062341A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102964014A (en) * | 2012-11-15 | 2013-03-13 | 新疆德安环保科技有限公司 | Treatment method of acid heavy metal wastewater |
| CN207175662U (en) * | 2017-09-14 | 2018-04-03 | 辽宁石化职业技术学院 | The equipment of heavy metal in a kind of removal sewage |
| CN110526476A (en) * | 2019-09-25 | 2019-12-03 | 北京华电利源科技有限公司 | The method for handling comprehensive heavy metal wastewater thereby |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115465998A (en) * | 2022-09-29 | 2022-12-13 | 常州市飞荣达电子材料有限公司 | Heavy metal wastewater treatment method and treatment equipment thereof |
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