CN111747595A - Waste water purification process in incineration slag treatment process - Google Patents
Waste water purification process in incineration slag treatment process Download PDFInfo
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- CN111747595A CN111747595A CN201910247229.8A CN201910247229A CN111747595A CN 111747595 A CN111747595 A CN 111747595A CN 201910247229 A CN201910247229 A CN 201910247229A CN 111747595 A CN111747595 A CN 111747595A
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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
- C02F1/24—Treatment of water, waste water, or sewage by 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
- 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
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
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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
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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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
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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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
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
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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
- C02F1/66—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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
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- Water Supply & Treatment (AREA)
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- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention provides a waste water purification process in the incineration slag treatment process, which comprises the following steps: removing oil stains by an air floatation method, adjusting the pH value, performing chemical precipitation treatment and filtration treatment, performing layer filtration treatment, performing circulating concentration treatment, performing centrifugal filtration treatment, performing nanofiltration treatment, re-capturing heavy metal, performing magnetic separation metal treatment and performing gravity metal reselection treatment; the method can effectively remove the oil stains in the wastewater by removing the oil stains through the air floatation method, can completely remove the oil stains in the wastewater by matching with the activated carbon adsorption filtration in the subsequent layer filtration treatment, can filter out large-particle heavy metal precipitates contained in the wastewater through the pH value adjustment treatment, the chemical precipitation treatment and the filtration treatment, can remove small-molecule heavy metals contained in the wastewater through the centrifugal filtration treatment, the ultrafiltration membrane treatment, the nanofiltration treatment and the heavy metal recapture treatment, can reach the discharge standard, can perform wastewater purification treatment without using more fields, and effectively saves field resources.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a waste water purification process in an incinerator slag treatment process.
Background
With the rapid development of economy and the increasing improvement of the living standard of people, the domestic garbage is increased rapidly, spreads from cities to vast rural areas, and threatens the living environment of human beings more and more, so that how to treat the garbage economically and effectively and prevent environmental pollution becomes an urgent problem to be solved by the whole society.
At present, the treatment of domestic garbage is gradually changed into advanced treatment modes such as compost fermentation, incineration power generation and resource recovery from the traditional primary treatment modes such as field stacking and simple landfill, and particularly, the incineration and comprehensive utilization of garbage are more and more emphasized by people because the available field for stacking garbage is limited, the cost for landfill is increased, and the like. The slag generated after the garbage incineration can be used as a raw material for preparing the baking-free bricks, but the slag is firstly required to be subjected to multi-stage treatment to prepare the baking-free bricks, wherein the multi-stage treatment comprises the processes of washing precipitation, metal gravity separation by buoyancy and the like, a large amount of water resources are used in the processes, more waste water is generated, the waste water contains more heavy metal substances, and secondary pollution is caused if the waste water is not subjected to further purification treatment. Therefore, the invention provides a waste water purification process in the incineration slag treatment process, which aims to solve the defects in the prior art.
Disclosure of Invention
Aiming at the problems, the method can effectively remove the oil stains in the wastewater by removing the oil stains through an air floatation method, can completely remove the oil stains in the wastewater by being matched with activated carbon adsorption filtration in subsequent layer filtration treatment, can filter large-particle heavy metal precipitates contained in the wastewater through pH value adjustment treatment, chemical precipitation treatment and filtration treatment, can remove small-molecule heavy metals contained in the wastewater through centrifugal filtration treatment, ultrafiltration membrane treatment, nanofiltration treatment and heavy metal recapture treatment, and can achieve the discharge standard of the treated wastewater.
The invention provides a waste water purification process in the incineration slag treatment process, which comprises the following steps:
the method comprises the following steps: firstly, introducing waste water generated in the treatment process of incinerator slag into a sedimentation tank for removing oil stains by an air floatation method;
step two: carrying out pH value adjustment treatment, chemical precipitation treatment and filtration treatment on the wastewater subjected to oil stain removal in the step one to distinguish heavy metal precipitates and filtered water;
step three: carrying out layer filtration treatment on the filtered water filtered in the first step to remove suspended substances and large-particle impurities in the filtered water;
step four: performing circulating concentration treatment on the filtered water subjected to the layer filtering treatment in the step two, performing centrifugal filtration on the filtered water subjected to the circulating concentration treatment, and performing filtering treatment by using an ultrafiltration membrane after the centrifugal filtration treatment to distinguish a concentrated solution and a concentrate;
step five: carrying out nanofiltration treatment on the concentrated solution obtained in the third step, and then carrying out heavy metal recapture treatment after the nanofiltration treatment to remove trace micromolecular heavy metals contained in the concentrated solution;
step six: and (4) carrying out magnetic separation metal treatment and gravity metal reselection treatment on the concentrate obtained in the third step, and recovering available metal.
The further improvement lies in that: in the first step, the wastewater generated in the treatment process of the incinerator slag is allowed to stand for 1-1.5 hours in a sedimentation tank, then air is introduced into the wastewater to float the oil stains contained in the wastewater, and then the oil stains on the upper layer in the sedimentation tank are removed.
The further improvement lies in that: and in the second step, the wastewater generated in the incineration slag treatment process is concentrated in a sedimentation tank, lime is added into the sedimentation tank, the pH value of the wastewater in the sedimentation tank is adjusted to be 10-11, then an oxidant is added into the sedimentation tank for chemical precipitation treatment, heavy metal generated in the incineration slag treatment process is precipitated, and then a filter press is adopted for filtering to distinguish heavy metal precipitate and filtered water.
The further improvement lies in that: and in the second step, the heavy metal precipitate separated by the filter press filtering area cannot be discarded and discharged at will, and needs to be recycled in a scientific classification manner.
The further improvement lies in that: the oxidant is any one of liquid chlorine, hypochlorous acid or ferrous sulfate.
The further improvement lies in that: the third middle layer filtering treatment comprises fine sand filtering and active carbon adsorption filtering.
The further improvement lies in that: and in the fourth step, the centrifugal filtration rotating speed is controlled to be 1500-2200 revolutions per minute during the centrifugal filtration, the centrifugal filtration time is 30-40 minutes, and after the ultrafiltration membrane is adopted for filtration treatment, a cleaner is required to be adopted for repeatedly cleaning the ultrafiltration membrane.
The further improvement lies in that: when the cleaning device is used for cleaning the ultrafiltration membrane, 2-5% of sulfuric acid and 2% of sodium hypochlorite solution are mixed and cleaned, and the single cleaning time is not less than 10 minutes.
The invention has the beneficial effects that: the method can effectively save field resources by adopting 2-5% of sulfuric acid and 2% of sodium hypochlorite solution to mix and clean the ultrafiltration membrane, has high cleaning efficiency, can remove the back washing process required by various devices, and improves the working efficiency.
Detailed Description
In order to further understand the present invention, the following detailed description will be made with reference to the following examples, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
A waste water purification process in the incineration slag treatment process comprises the following steps:
the method comprises the following steps: firstly, allowing wastewater generated in the incinerator slag treatment process to stand in a sedimentation tank for 1.5 hours, then introducing air into the wastewater to float oil stains contained in the wastewater, and then removing the oil stains on the upper layer in the sedimentation tank;
step two: the method comprises the following steps of (1) concentrating waste water generated in the incineration slag treatment process in a sedimentation tank, adding lime into the sedimentation tank, adjusting the pH value of the waste water in the sedimentation tank to be 10, then adding liquid chlorine into the sedimentation tank for chemical sedimentation treatment, precipitating heavy metal generated in the incineration slag process, then filtering by using a filter press to distinguish heavy metal precipitates and filtered water, wherein the heavy metal precipitates distinguished by filtering by the filter press cannot be discarded at will and discharged and need to be recycled in a scientific classification manner;
step three: carrying out layer filtration treatment on the filtered water filtered in the first step, wherein the layer filtration treatment comprises fine sand filtration and activated carbon adsorption filtration, and removing suspended substances and large-particle impurities in the filtered water;
step four: performing circulating concentration treatment on the filtered water subjected to the layer filtering treatment in the second step, performing centrifugal filtration on the filtered water subjected to the circulating concentration treatment, performing filtering treatment by using an ultrafiltration membrane after the centrifugal filtration treatment to distinguish a concentrated solution and a concentrate, controlling the centrifugal filtration speed to 2000 rpm during the centrifugal filtration, controlling the centrifugal filtration time to 35 minutes, mixing 4% sulfuric acid and 2% sodium hypochlorite solution by using a cleaner after the filtering treatment by using the ultrafiltration membrane, and repeatedly cleaning the ultrafiltration membrane, wherein the single cleaning time is not less than 10 minutes;
step five: carrying out nanofiltration treatment on the concentrated solution obtained in the third step, and then carrying out heavy metal recapture treatment after the nanofiltration treatment to remove trace micromolecular heavy metals contained in the concentrated solution;
step six: and (4) carrying out magnetic separation metal treatment and gravity metal reselection treatment on the concentrate obtained in the third step, and recovering available metal.
The method can effectively save field resources by adopting 2-5% of sulfuric acid and 2% of sodium hypochlorite solution to mix and clean the ultrafiltration membrane, has high cleaning efficiency, can remove the back washing process required by various devices, and improves the working efficiency.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A waste water purification process in the incineration slag treatment process is characterized by comprising the following steps:
the method comprises the following steps: firstly, introducing waste water generated in the treatment process of incinerator slag into a sedimentation tank for removing oil stains by an air floatation method;
step two: carrying out pH value adjustment treatment, chemical precipitation treatment and filtration treatment on the wastewater subjected to oil stain removal in the step one to distinguish heavy metal precipitates and filtered water;
step three: carrying out layer filtration treatment on the filtered water filtered in the first step to remove suspended substances and large-particle impurities in the filtered water;
step four: performing circulating concentration treatment on the filtered water subjected to the layer filtering treatment in the step two, performing centrifugal filtration on the filtered water subjected to the circulating concentration treatment, and performing filtering treatment by using an ultrafiltration membrane after the centrifugal filtration treatment to distinguish a concentrated solution and a concentrate;
step five: carrying out nanofiltration treatment on the concentrated solution obtained in the third step, and then carrying out heavy metal recapture treatment after the nanofiltration treatment to remove trace micromolecular heavy metals contained in the concentrated solution;
step six: and (4) carrying out magnetic separation metal treatment and gravity metal reselection treatment on the concentrate obtained in the third step, and recovering available metal.
2. A process for purifying waste water in an incineration slag treatment process as recited in claim 1, wherein: in the first step, the wastewater generated in the treatment process of the incinerator slag is allowed to stand for 1-1.5 hours in a sedimentation tank, then air is introduced into the wastewater to float the oil stains contained in the wastewater, and then the oil stains on the upper layer in the sedimentation tank are removed.
3. A process for purifying waste water in an incineration slag treatment process as recited in claim 1, wherein: and in the second step, the wastewater generated in the incineration slag treatment process is concentrated in a sedimentation tank, lime is added into the sedimentation tank, the pH value of the wastewater in the sedimentation tank is adjusted to be 10-11, then an oxidant is added into the sedimentation tank for chemical precipitation treatment, heavy metal generated in the incineration slag treatment process is precipitated, and then a filter press is adopted for filtering to distinguish heavy metal precipitate and filtered water.
4. A process for purifying waste water in an incineration slag treatment process as recited in claim 3, wherein: and in the second step, the heavy metal precipitate separated by the filter press filtering area cannot be discarded and discharged at will, and needs to be recycled in a scientific classification manner.
5. A process for purifying waste water in an incineration slag treatment process as recited in claim 3, wherein: the oxidant is any one of liquid chlorine, hypochlorous acid or ferrous sulfate.
6. A process for purifying waste water in an incineration slag treatment process as recited in claim 1, wherein: the third middle layer filtering treatment comprises fine sand filtering and active carbon adsorption filtering.
7. A process for purifying waste water in an incineration slag treatment process as recited in claim 1, wherein: and in the fourth step, the centrifugal filtration rotating speed is controlled to be 1500-2200 revolutions per minute during the centrifugal filtration, the centrifugal filtration time is 30-40 minutes, and after the ultrafiltration membrane is adopted for filtration treatment, a cleaner is required to be adopted for repeatedly cleaning the ultrafiltration membrane.
8. A process for purifying waste water in an incineration slag treatment process as recited in claim 1, wherein: when the cleaning device is used for cleaning the ultrafiltration membrane, 2-5% of sulfuric acid and 2% of sodium hypochlorite solution are mixed and cleaned, and the single cleaning time is not less than 10 minutes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910247229.8A CN111747595A (en) | 2019-03-29 | 2019-03-29 | Waste water purification process in incineration slag treatment process |
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| CN201910247229.8A CN111747595A (en) | 2019-03-29 | 2019-03-29 | Waste water purification process in incineration slag treatment process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112811662A (en) * | 2021-01-07 | 2021-05-18 | 范丽丽 | Multiple purifier of sewage |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112811662A (en) * | 2021-01-07 | 2021-05-18 | 范丽丽 | Multiple purifier of sewage |
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Application publication date: 20201009 |