CN113023942A - Treatment process of chromium-containing wastewater - Google Patents
Treatment process of chromium-containing wastewater Download PDFInfo
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- CN113023942A CN113023942A CN202110276530.9A CN202110276530A CN113023942A CN 113023942 A CN113023942 A CN 113023942A CN 202110276530 A CN202110276530 A CN 202110276530A CN 113023942 A CN113023942 A CN 113023942A
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- chromium
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- containing wastewater
- wastewater
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- 239000002351 wastewater Substances 0.000 title claims abstract description 77
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 70
- 239000011651 chromium Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000008569 process Effects 0.000 title claims abstract description 34
- 239000010802 sludge Substances 0.000 claims abstract description 65
- 238000004062 sedimentation Methods 0.000 claims abstract description 29
- 230000002378 acidificating effect Effects 0.000 claims abstract description 27
- 239000002244 precipitate Substances 0.000 claims abstract description 19
- 230000007935 neutral effect Effects 0.000 claims abstract description 18
- 238000002386 leaching Methods 0.000 claims abstract description 11
- 238000010979 pH adjustment Methods 0.000 claims abstract description 9
- 230000009467 reduction Effects 0.000 claims abstract description 7
- 239000006228 supernatant Substances 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 15
- 238000005189 flocculation Methods 0.000 claims description 15
- 230000016615 flocculation Effects 0.000 claims description 15
- 239000003513 alkali Substances 0.000 claims description 9
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 239000003638 chemical reducing agent Substances 0.000 claims description 6
- VQWFNAGFNGABOH-UHFFFAOYSA-K chromium(iii) hydroxide Chemical compound [OH-].[OH-].[OH-].[Cr+3] VQWFNAGFNGABOH-UHFFFAOYSA-K 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical group OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims description 3
- 229940038476 chelated chromium Drugs 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 150000001844 chromium Chemical class 0.000 claims description 3
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000008394 flocculating agent Substances 0.000 claims description 3
- 229910001385 heavy metal Inorganic materials 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims description 3
- 239000013049 sediment Substances 0.000 claims description 3
- 239000012445 acidic reagent Substances 0.000 abstract description 3
- 238000006386 neutralization reaction Methods 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 230000001376 precipitating effect Effects 0.000 abstract 1
- 230000006872 improvement Effects 0.000 description 5
- 239000002689 soil Substances 0.000 description 4
- 239000002585 base Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Images
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- 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
-
- 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
- C02F1/5209—Regulation methods for flocculation or precipitation
-
- 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
-
- 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
- C02F1/70—Treatment of water, waste water, or sewage by reduction
-
- 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
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Removal Of Specific Substances (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention discloses a treatment process of chromium-containing wastewater, which comprises the following steps: step one, introducing neutral chromium-containing wastewater or acidic chromium-containing wastewater into a wastewater collection tank; step two, PH adjustment; step three, reduction or capture; step four, adjusting back the precipitate or directly precipitating; step five, treating supernatant liquor of the sedimentation tank; and step six, treating sludge at the lower layer of the sedimentation tank. The invention has the following advantages: the treatment of neutral chromium-containing wastewater and acidic chromium-containing wastewater can be realized by one set of process, and only slight differences exist in the variety of chemicals added and the pH value adjustment; the same process system is adopted, so that the equipment investment and the occupied area are saved; the acidic chromium-containing wastewater is directly treated under acidic conditions, and the effluent is directly recycled, so that the treatment cost of acid-base neutralization is reduced, and meanwhile, when the acidic chromium-containing wastewater is used for subsequent leaching, a part of acidic reagents are supplemented, and a part of treatment cost can be saved.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of chromium-containing wastewater treatment, in particular to a treatment process of chromium-containing wastewater.
[ background of the invention ]
When the polluted soil is leached, due to the fact that the change of the polluted components and the concentration of the soil is large, a targeted leaching scheme needs to be adopted, the treatment effect is guaranteed, and meanwhile the treatment cost is optimal. Generally, acid washing is needed for high-concentration polluted soil; the low-concentration contaminated soil is washed by water, so that the leacheate with different properties needs to be treated. When the neutral chromium-containing wastewater and the acidic chromium-containing wastewater are treated by the existing process, two sets of completely different process equipment are required, so that the equipment cost and the maintenance cost are overhigh, and a large amount of space is occupied.
[ summary of the invention ]
The invention aims to provide a treatment process of chromium-containing wastewater, which can solve the technical problems related to the background technology.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a treatment process of chromium-containing wastewater comprises the following steps:
step one, introducing neutral chromium-containing wastewater into a wastewater collection tank;
step two, adjusting the pH value of the neutral chromium-containing wastewater, and pumping the liquid in the wastewater collection pool into a pH adjustment tank through a lift pump to adjust the pH value;
step three, reduction, namely introducing the neutral chromium-containing wastewater subjected to pH adjustment into a reduction tank, and adding a reducing agent to reduce hexavalent chromium into trivalent chromium under an acidic condition;
step four, adjusting back the precipitation, namely introducing the reduced wastewater into a flocculation reaction tank, adding alkali to adjust the pH, installing an online pH meter in the flocculation reaction tank, setting the pH to be 9, interlocking an alkali adding metering pump with the pH meter, automatically adjusting the adding amount according to the pH of the inlet water to ensure that the pH is not higher than 9 and ensure that trivalent chromium forms precipitates; the flocculation reaction tank is divided into two grids, alkali is added into the first grid to adjust the pH back, a flocculating agent is added into the second grid, the effluent automatically flows into the inclined tube sedimentation tank, the formed precipitate is precipitated in the inclined tube sedimentation tank, the effluent enters an intermediate water tank at the front end of the multi-media filter, and the precipitated sludge is periodically discharged into the high-density sludge concentration tank;
step five, treating effluent from the sedimentation tank, further purifying the effluent generated after sedimentation through a multi-medium filter, and using the purified effluent as leaching supplementary water;
and step six, treating the lower layer sludge, wherein the lower layer sludge firstly enters a high-density sludge concentration tank for concentration, the sludge at the bottom of the high-density sludge concentration tank passes through a plate-and-frame filter press to obtain chromium-containing sludge, then the chromium-containing sludge is treated, and the supernatant of the high-density sludge concentration tank returns to the wastewater collection tank.
As a preferred improvement of the present invention: in the second step, the pH is adjusted to 2-3.
As a preferred improvement of the present invention: in step two, sulfuric acid is used for pH adjustment.
As a preferred improvement of the present invention: in step three, the reducing agent is sulfite.
As a preferred improvement of the present invention: in step four, the precipitate is a chromium hydroxide precipitate.
The invention also provides a treatment process of the chromium-containing wastewater, which comprises the following steps:
step one, introducing acidic chromium-containing wastewater into a wastewater collection tank;
step two, arranging an overrunning pipe, and directly pumping the liquid in the wastewater collection tank into a flocculation reaction tank by a lifting pump;
collecting, namely directly collecting the acidic chromium-containing wastewater by adopting a heavy metal collecting agent in a flocculation reaction tank to generate chelated chromium salt;
step four, sedimentation, namely introducing the captured wastewater into an inclined tube sedimentation tank, sedimentating the formed sediment in the inclined tube sedimentation tank, introducing the effluent into an intermediate water tank at the front end of a multi-media filter, and periodically discharging the sedimentated sludge into a high-density sludge concentration tank;
step five, treating effluent from the sedimentation tank, further purifying the effluent generated after sedimentation through a multi-medium filter, and using the purified effluent as leaching supplementary water;
and step six, treating the lower layer sludge, wherein the lower layer sludge firstly enters a high-density sludge concentration tank for concentration, the sludge at the bottom of the high-density sludge concentration tank passes through a plate-and-frame filter press to obtain chromium-containing sludge, then the chromium-containing sludge is treated, and the supernatant of the high-density sludge concentration tank returns to the wastewater collection tank.
As a preferred improvement of the present invention: in step four, the precipitate is a chromium hydroxide precipitate.
Compared with the prior art, the treatment process of the chromium-containing wastewater provided by the invention has the following advantages:
1. the neutral chromium-containing wastewater and the acidic chromium-containing wastewater can be treated by one set of process, and only slight differences exist in the variety of chemicals added and the pH value adjusted;
2. the same process system is adopted, so that the equipment investment and the occupied area are saved;
3. the acidic chromium-containing wastewater is directly treated under acidic conditions, and the effluent is directly recycled, so that the treatment cost of acid-base neutralization is reduced, and meanwhile, when the acidic chromium-containing wastewater is used for subsequent leaching, a part of acidic reagents are supplemented, and a part of treatment cost can be saved.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a flow chart of a treatment process of neutral chromium-containing wastewater in the invention;
FIG. 2 is a flow chart of the treatment process of the acidic chromium-containing wastewater of the present invention.
[ detailed description ] embodiments
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, the present invention provides a process for treating chromium-containing wastewater, comprising the following steps:
step one, introducing neutral chromium-containing wastewater into a wastewater collection tank;
step two, adjusting the pH value of the neutral chromium-containing wastewater, and pumping the liquid in the wastewater collection pool into a pH adjustment tank through a lift pump to adjust the pH value;
specifically, the pH is adjusted to 2 to 3, and the pH is adjusted with sulfuric acid.
Step three, reduction, namely introducing the neutral chromium-containing wastewater subjected to pH adjustment into a reduction tank, and adding a reducing agent to reduce hexavalent chromium into trivalent chromium under an acidic condition;
it is further noted that the reducing agent is sulfite.
Step four, adjusting back the precipitation, namely introducing the reduced wastewater into a flocculation reaction tank, adding alkali to adjust the pH, installing an online pH meter in the flocculation reaction tank, setting the pH to be 9, interlocking an alkali adding metering pump with the pH meter, and automatically adjusting the adding amount according to the pH of the inlet water to ensure that the pH is not higher than the pH and ensure that trivalent chromium forms precipitates; the flocculation reaction tank is divided into two grids, alkali is added into the first grid to adjust the pH back, a flocculating agent is added into the second grid, the effluent automatically flows into the inclined tube sedimentation tank, the formed precipitate is precipitated in the inclined tube sedimentation tank, the effluent enters an intermediate water tank at the front end of the multi-media filter, and the precipitated sludge is periodically discharged into the high-density sludge concentration tank;
it is further noted that the precipitate is a chromium hydroxide precipitate.
Step five, treating effluent from the sedimentation tank, further purifying the effluent generated after sedimentation through a multi-medium filter, and using the purified effluent as leaching supplementary water;
and step six, treating the lower layer sludge, wherein the lower layer sludge firstly enters a high-density sludge concentration tank for concentration, the sludge at the bottom of the high-density sludge concentration tank passes through a plate-and-frame filter press to obtain chromium-containing sludge, then the chromium-containing sludge is treated, and the supernatant of the high-density sludge concentration tank returns to the wastewater collection tank.
Further, a qualified company is required to perform sludge treatment on the chromium-containing sludge.
Example 2
Referring to FIG. 2, the invention also provides a treatment process of chromium-containing wastewater, comprising the following steps:
step one, introducing acidic chromium-containing wastewater into a wastewater collection tank;
step two, arranging an overrunning pipe, and directly pumping the liquid in the wastewater collection tank into a flocculation reaction tank by a lifting pump;
collecting, namely directly collecting the acidic chromium-containing wastewater by adopting a heavy metal collecting agent in a flocculation reaction tank to generate chelated chromium salt;
step four, sedimentation, namely introducing the captured wastewater into an inclined tube sedimentation tank, sedimentating the formed sediment in the inclined tube sedimentation tank, introducing the effluent into an intermediate water tank at the front end of a multi-media filter, and periodically discharging the sedimentated sludge into a high-density sludge concentration tank;
it is further noted that the precipitate is a chromium hydroxide precipitate.
Step five, treating effluent from the sedimentation tank, further purifying the effluent generated after sedimentation through a multi-medium filter, and using the purified effluent as leaching supplementary water;
and step six, treating the lower layer sludge, wherein the lower layer sludge firstly enters a high-density sludge concentration tank for concentration, the sludge at the bottom of the high-density sludge concentration tank passes through a plate-and-frame filter press to obtain chromium-containing sludge, then the chromium-containing sludge is treated, and the supernatant of the high-density sludge concentration tank returns to the wastewater collection tank.
Further, a qualified company is required to perform sludge treatment on the chromium-containing sludge.
It can be seen from examples 1 and 2 that the neutral chromium-containing wastewater and the acidic chromium-containing wastewater are treated by the same process system, and the difference between the neutral chromium-containing wastewater and the acidic chromium-containing wastewater is mainly that the neutral chromium-containing wastewater can be directly recycled after being treated by the treatment process provided by the invention, and the recycle rate of the purified leaching water reaches more than 95%; the acidic chromium-containing wastewater can be directly recycled after being treated, and the recycling rate of the purified shower water reaches over 90 percent.
Compared with the prior art, the treatment process of the chromium-containing wastewater provided by the invention has the following advantages:
1. the neutral chromium-containing wastewater and the acidic chromium-containing wastewater can be treated by one set of process, and only slight differences exist in the variety of chemicals added and the pH value adjusted;
2. the same process system is adopted, so that the equipment investment and the occupied area are saved;
3. the acidic chromium-containing wastewater is directly treated under acidic conditions, and the effluent is directly recycled, so that the treatment cost of acid-base neutralization is reduced, and meanwhile, when the acidic chromium-containing wastewater is used for subsequent leaching, a part of acidic reagents are supplemented, and a part of treatment cost can be saved.
While embodiments of the invention have been disclosed above, it is not limited to the applications set forth in the specification and the embodiments, which are fully applicable to various fields of endeavor for which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (7)
1. A treatment process of chromium-containing wastewater is characterized by comprising the following steps:
step one, introducing neutral chromium-containing wastewater into a wastewater collection tank;
step two, adjusting the pH value of the neutral chromium-containing wastewater, and pumping the liquid in the wastewater collection pool into a pH adjustment tank through a lift pump to adjust the pH value;
step three, reduction, namely introducing the neutral chromium-containing wastewater subjected to pH adjustment into a reduction tank, and adding a reducing agent to reduce hexavalent chromium into trivalent chromium under an acidic condition;
step four, adjusting back the precipitation, namely introducing the reduced wastewater into a flocculation reaction tank, adding alkali to adjust the pH, installing an online pH meter in the flocculation reaction tank, setting the pH to be 9, interlocking an alkali adding metering pump with the pH meter, automatically adjusting the adding amount according to the pH of the inlet water to ensure that the pH is not higher than 9 and ensure that trivalent chromium forms precipitates; the flocculation reaction tank is divided into two grids, alkali is added into the first grid to adjust the pH back, a flocculating agent is added into the second grid, the effluent automatically flows into the inclined tube sedimentation tank, the formed precipitate is precipitated in the inclined tube sedimentation tank, the effluent enters an intermediate water tank at the front end of the multi-media filter, and the precipitated sludge is periodically discharged into the high-density sludge concentration tank;
step five, treating effluent from the sedimentation tank, further purifying the effluent generated after sedimentation through a multi-medium filter, and using the purified effluent as leaching supplementary water;
and step six, treating the lower layer sludge, wherein the lower layer sludge firstly enters a high-density sludge concentration tank for concentration, sludge at the bottom of the high-density sludge concentration tank is dewatered by a plate-and-frame filter press to obtain chromium-containing sludge, then the chromium-containing sludge is treated, and supernatant of the high-density sludge concentration tank returns to the wastewater collection tank.
2. The process of claim 1, wherein the treatment process comprises the following steps: in the second step, the pH is adjusted to 2-3.
3. The process of claim 1 or 2, wherein the treatment comprises the following steps: in step two, sulfuric acid is used for pH adjustment.
4. The process of claim 1, wherein the treatment process comprises the following steps: in step three, the reducing agent is sulfite.
5. The process of claim 1, wherein the treatment process comprises the following steps: in step four, the precipitate is a chromium hydroxide precipitate.
6. A treatment process of chromium-containing wastewater is characterized by comprising the following steps:
step one, introducing acidic chromium-containing wastewater into a wastewater collection tank;
step two, arranging an overrunning pipe, and directly pumping the liquid in the wastewater collection tank into a flocculation reaction tank by a lifting pump;
collecting, namely directly collecting the acidic chromium-containing wastewater by adopting a heavy metal collecting agent in a flocculation reaction tank to generate chelated chromium salt;
step four, sedimentation, namely introducing the captured wastewater into an inclined tube sedimentation tank, sedimentating the formed sediment in the inclined tube sedimentation tank, introducing the effluent into an intermediate water tank at the front end of a multi-media filter, and periodically discharging the sedimentated sludge into a high-density sludge concentration tank;
step five, treating effluent from the sedimentation tank, further purifying the effluent generated after sedimentation through a multi-medium filter, and using the purified effluent as leaching supplementary water;
and step six, treating the lower layer sludge, wherein the lower layer sludge firstly enters a high-density sludge concentration tank for concentration, the sludge at the bottom of the high-density sludge concentration tank passes through a plate-and-frame filter press to obtain chromium-containing sludge, then the chromium-containing sludge is treated, and the supernatant of the high-density sludge concentration tank returns to the wastewater collection tank.
7. The process of claim 6, wherein the treatment process comprises the following steps: in step four, the precipitate is a chromium hydroxide precipitate.
Priority Applications (1)
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| CN202110276530.9A CN113023942A (en) | 2021-03-15 | 2021-03-15 | Treatment process of chromium-containing wastewater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110276530.9A CN113023942A (en) | 2021-03-15 | 2021-03-15 | Treatment process of chromium-containing wastewater |
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| CN202110276530.9A Pending CN113023942A (en) | 2021-03-15 | 2021-03-15 | Treatment process of chromium-containing wastewater |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006224023A (en) * | 2005-02-18 | 2006-08-31 | Matsushita Electric Ind Co Ltd | Method and apparatus for treating heavy metal-containing waste water |
| CN101633536A (en) * | 2008-07-21 | 2010-01-27 | 张通 | Method for treating small-size electroplating waste water |
| CN110451622A (en) * | 2019-08-12 | 2019-11-15 | 北京师范大学 | Heavy metals removal preparation and its synthetic method and application |
| CN111285565A (en) * | 2019-12-31 | 2020-06-16 | 中国启源工程设计研究院有限公司 | Chromium-containing electroplating wastewater treatment device and method |
-
2021
- 2021-03-15 CN CN202110276530.9A patent/CN113023942A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006224023A (en) * | 2005-02-18 | 2006-08-31 | Matsushita Electric Ind Co Ltd | Method and apparatus for treating heavy metal-containing waste water |
| CN101633536A (en) * | 2008-07-21 | 2010-01-27 | 张通 | Method for treating small-size electroplating waste water |
| CN110451622A (en) * | 2019-08-12 | 2019-11-15 | 北京师范大学 | Heavy metals removal preparation and its synthetic method and application |
| CN111285565A (en) * | 2019-12-31 | 2020-06-16 | 中国启源工程设计研究院有限公司 | Chromium-containing electroplating wastewater treatment device and method |
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