CN113185025A - Method for eliminating black and odorous river channel - Google Patents
Method for eliminating black and odorous river channel Download PDFInfo
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- CN113185025A CN113185025A CN202110485064.5A CN202110485064A CN113185025A CN 113185025 A CN113185025 A CN 113185025A CN 202110485064 A CN202110485064 A CN 202110485064A CN 113185025 A CN113185025 A CN 113185025A
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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
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
-
- 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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- 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
-
- 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
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/007—Contaminated open waterways, rivers, lakes or ponds
-
- 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
- C02F2303/04—Disinfection
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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)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention discloses a method for eliminating black and odorous river channels, which comprises the following steps: adding a strong oxidant into river water of the river channel, and carrying out strong oxidation treatment on the river water; adding bleaching powder into the river water subjected to strong oxidation treatment, and carrying out reoxidation and flocculation on the river water; and adding a flocculating agent into the reoxidized and flocculated river water to flocculate and settle the river water. The steps are mutually cooperated, so that the efficiency of treating the black and odor of the water body is greatly improved, and on the other hand, the bleaching powder with low manufacturing cost replaces part of flocculating agents, so that the cost for eliminating the black and odor is reduced.
Description
Technical Field
The invention relates to the field of river regulation, in particular to a method for eliminating black and odorous river.
Background
Water pollution is a worldwide environmental problem, and pollutants in the natural environment enter the water body through the atmosphere, waste water, rainwater and scouring, are gradually enriched in the water body and cause the water body to be seriously polluted. River pollution is one of the common water body pollution.
The river is generally established in an area where residents gather. Polluted rivers are usually black and smelly due to microorganism enrichment and excessive pollutant. The ecological system in the black and odorous river is destroyed and cannot be naturally purified, so that the water body is in a continuously deteriorated state. The method not only influences the landscape along the riverway and causes serious visual pollution, but also has negative effects on the local economic development and the ecological environment construction of the area, and needs to be treated urgently.
The existing black and odorous river channel elimination method comprises the following steps: dredging, water changing, chemical treatment and the like. Dredging generally refers to removing the silt in the river bottom by manual or mechanical means, so as to remove the pollutants deposited in the silt in the river bottom. The method can damage the original biological population structure and habitat of the river and weaken the self-cleaning function of the river, and has the defects of long construction period, short after-effect period, high cost and the like. The water changing means that a fresh clean water source is introduced into a polluted river channel, so that the polluted water body is diluted. Although the method is rapid and long in duration, the maintenance cost is high, and the water resource waste is serious. The chemical treatment is a technology for removing water layer pollutants by adding a chemical agent to improve water quality, and has the advantages of high treatment speed and relatively low cost. However, the existing chemical treatment method has the disadvantages of undesirable treatment effect on severely polluted water bodies, especially water bodies with various pollutants, short after-effect period and difficult long-term maintenance.
Disclosure of Invention
In view of the above, the present invention provides a method for eliminating black and odorous river channels, comprising:
adding a strong oxidant into river water of the river channel, and carrying out strong oxidation treatment on the river water; adding bleaching powder into the river water subjected to strong oxidation treatment, and carrying out reoxidation and flocculation on the river water; and adding a flocculating agent into the reoxidized and flocculated river water to flocculate and settle the river water.
Optionally, the strong oxidizer comprises one or more of sodium hypochlorite, potassium hypochlorite.
Optionally, the bleaching powder is a mixture of calcium hydroxide, calcium chloride, and calcium hypochlorite.
Optionally, the flocculant is at least one of polyaluminum chloride and polyacrylamide.
Optionally, the flocculant is a mixture of the polyaluminum chloride and the polyacrylamide; the mass ratio of the polyaluminium chloride to the polyacrylamide is 1: 3.
optionally, the mass of the strong oxidant accounts for about 20% of the sum of the mass of the strong oxidant, the bleaching powder and the flocculating agent.
Optionally, the mass of the bleaching powder accounts for about 20% of the total mass of the strong oxidizer, the bleaching powder and the flocculating agent.
Optionally, the mass of the flocculating agent accounts for about 60% of the sum of the mass of the strong oxidizer, the bleaching powder and the flocculating agent.
Optionally, the bleaching powder is added 2-5h after the addition of the strong oxidant.
Optionally, the flocculating agent is added 5-12 hours after the addition of the bleaching powder.
Compared with the prior art, the method for eliminating the black and odorous river channel provided by the invention adopts a multi-stage chemical treatment mode, and various stages of chemical treatment are mutually related and act synergistically. Specifically, the first-stage chemical treatment adopts a strong oxidant to carry out strong oxidation treatment on the polluted water body, so as to quickly eliminate bacteria, algae or other harmful organisms in the water body; the second-stage chemical treatment adopts bleaching powder to carry out secondary oxidation and flocculation on the water body after the first-stage chemical treatment, on one hand, calcium hypochlorite in the bleaching powder can carry out secondary oxidation on the water body to further kill bacteria, algae or other harmful organisms, on the other hand, calcium hydroxide in the bleaching powder provides an alkaline environment for flocculation, and the lower solubility of the calcium hydroxide in water enables the calcium hydroxide to be used as a coagulation nucleus of the flocculation, so that the short-time generation of the flocculation is facilitated; the third stage chemical treatment adopts a flocculating agent to carry out advanced flocculation and sedimentation on the water body of the second stage chemical treatment, thereby removing various colloidal substances and fine suspended substances in the water.
Detailed Description
In order to better understand the present invention, the following examples further illustrate the invention, the examples are only used for explaining the invention, not to constitute any limitation of the invention.
Example 1
A method for eliminating black and odorous river channels comprises the following steps:
adding a strong oxidant into river water of the river channel, and carrying out strong oxidation treatment on the river water;
secondly, adding bleaching powder into the river water subjected to strong oxidation treatment, and carrying out reoxidation and flocculation on the river water;
and step three, adding a flocculating agent into the reoxidized and flocculated river water, and performing flocculation sedimentation on the river water.
In the embodiment, sodium hypochlorite is selected as the hydroxide; bleaching powder is from conventional bleaching powder purchased in market, which is a mixture comprising calcium hydroxide, calcium chloride and calcium hypochlorite; the flocculant is polyaluminium chloride. The mass fractions of the sodium hypochlorite, the bleaching powder and the polyaluminium chloride are respectively as follows: 20%, 20% and 60%.
The experimental subject is 15 randomly selected riverways with different pollution degrees, the time interval between the first step and the second step is 2d, and the time interval between the second step and the third step is 5 d. After one week of treatment, the water quality of the water in all experimental riverways is obviously improved, the black and odorous water is basically eliminated, the transparency of the water reaches 2m, and the water quality reaches the national riverway water quality standard.
Example two
A method for eliminating black and odorous river channels comprises the following steps:
adding a strong oxidant into river water of the river channel, and carrying out strong oxidation treatment on the river water;
secondly, adding bleaching powder into the river water subjected to strong oxidation treatment, and carrying out reoxidation and flocculation on the river water;
and step three, adding a flocculating agent into the reoxidized and flocculated river water, and performing flocculation sedimentation on the river water.
In the embodiment, potassium hypochlorite is selected as the hydroxide; bleaching powder is from conventional bleaching powder purchased in market, which is a mixture comprising calcium hydroxide, calcium chloride and calcium hypochlorite; the flocculating agent is selected from polyacrylamide. The mass fractions of the sodium hypochlorite, the bleaching powder and the polyacrylamide are respectively as follows: 20%, 25% and 55%.
The experimental subject is 10 randomly selected riverways with different pollution degrees, the time interval between the first step and the second step is 5d, and the time interval between the second step and the third step is 7 d. After two weeks of treatment, the water quality of 10 experimental water bodies is obviously improved, the black and odorous water is basically eliminated, and the water quality reaches the national river water quality standard.
EXAMPLE III
A method for eliminating black and odorous river channels comprises the following steps:
adding a strong oxidant into river water of the river channel, and carrying out strong oxidation treatment on the river water;
secondly, adding bleaching powder into the river water subjected to strong oxidation treatment, and carrying out reoxidation and flocculation on the river water;
and step three, adding a flocculating agent into the reoxidized and flocculated river water, and performing flocculation sedimentation on the river water.
In the embodiment, sodium hypochlorite is selected as the hydroxide; bleaching powder is from conventional bleaching powder purchased in market, which is a mixture comprising calcium hydroxide, calcium chloride and calcium hypochlorite; the mass ratio of polyaluminium chloride to polyacrylamide is 1: 3 in a mixture of two or more. The mass fractions of sodium hypochlorite, bleaching powder and polyacrylamide are respectively about: 25%, 20% and 55%.
The experimental subject is a river channel with 12 randomly selected pollution degrees, the time interval between the first step and the second step is 5d, and the time interval between the second step and the third step is 7 d. After two weeks of treatment, the water quality of 12 experimental water bodies is obviously improved, the black and odorous water is basically eliminated, and the water quality reaches the national river water quality standard.
Example four
A method for eliminating black and odorous river channels comprises the following steps:
adding a strong oxidant into river water of the river channel, and carrying out strong oxidation treatment on the river water;
secondly, adding bleaching powder into the river water subjected to strong oxidation treatment, and carrying out reoxidation and flocculation on the river water;
and step three, adding a flocculating agent into the reoxidized and flocculated river water, and performing flocculation sedimentation on the river water.
In this embodiment, the sodium hypochlorite and potassium hypochlorite are used as the hydroxide in a mass ratio of 1: 1; bleaching powder is from conventional bleaching powder purchased in market, which is a mixture comprising calcium hydroxide, calcium chloride and calcium hypochlorite; the flocculating agent is selected from polyacrylamide. The mass fractions of sodium hypochlorite, bleaching powder and polyacrylamide are respectively about: 22%, 22% and 56%.
The experimental subject is 10 randomly selected riverways with different pollution degrees, the time interval between the first step and the second step is 3d, and the time interval between the second step and the third step is 6 d. Through treatment, the water quality of 10 experimental water bodies is obviously improved, the black and odorous water is basically eliminated, and the water quality reaches the national river water quality standard.
EXAMPLE five
A method for eliminating black and odorous river channels comprises the following steps:
adding a strong oxidant into river water of the river channel, and carrying out strong oxidation treatment on the river water;
secondly, adding bleaching powder into the river water subjected to strong oxidation treatment, and carrying out reoxidation and flocculation on the river water;
and step three, adding a flocculating agent into the reoxidized and flocculated river water, and performing flocculation sedimentation on the river water.
In this embodiment, the sodium hypochlorite and potassium hypochlorite are used as the hydroxide in a mass ratio of 1: 1; bleaching powder is from conventional bleaching powder purchased in market, which is a mixture comprising calcium hydroxide, calcium chloride and calcium hypochlorite; the flocculant is polyaluminium chloride. The mass fractions of the sodium hypochlorite, the bleaching powder and the polyaluminium chloride are respectively about: 20%, 20% and 60%.
The experimental subject is a river channel with different pollution degrees at 8 randomly selected places, the time interval between the first step and the second step is 3d, and the time interval between the second step and the third step is 7 d. Through treatment, the water quality of all tested water bodies is obviously improved, the black and odorous water is basically eliminated, and the water quality reaches the national river water quality standard.
In the above embodiments, the steps are related and cooperate with each other. Specifically, the treatment of the step one adopts a strong oxidant to carry out strong oxidation treatment on the polluted water body, so as to quickly eliminate bacteria, algae or other harmful organisms in the water body; secondly, carrying out secondary oxidation and flocculation on the water body subjected to the first-stage chemical treatment by adopting bleaching powder, wherein on one hand, calcium hypochlorite in the bleaching powder can carry out secondary oxidation on the water body to further kill bacteria, algae or other harmful organisms, on the other hand, calcium hydroxide in the bleaching powder provides an alkaline environment for flocculation, and the lower solubility of the calcium hydroxide in water enables the calcium hydroxide to be used as a coagulation nucleus of the flocculation, so that the short-time generation of the flocculation is facilitated; and step three, performing advanced flocculation and sedimentation on the water body subjected to the second-stage chemical treatment by using a flocculating agent, thereby removing various colloidal substances and fine suspended substances in the water. The mutual connection of the steps greatly improves the efficiency of treating the black and odor of the water body, and on the other hand, the bleaching powder with low cost in the second step replaces part of the flocculating agents in the third step (the mass ratio of the reagents added in the third step is generally 20 percent to 60 percent), thereby reducing the cost of eliminating the black and odor.
It should be noted that the steps and methods adopted in the claims of the present invention are the same as those of the above-mentioned embodiments, and for the sake of avoiding redundancy, the present invention describes the preferred embodiments, but those skilled in the art can make other changes and modifications to these embodiments once they learn the basic inventive concept. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
Various modifications and alterations of this invention may be made by those skilled in the art without departing from the spirit and scope of this invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for eliminating black and odorous river channels is characterized by comprising the following steps:
adding a strong oxidant into river water of the river channel, and carrying out strong oxidation treatment on the river water;
adding bleaching powder into the river water subjected to strong oxidation treatment, and carrying out reoxidation and flocculation on the river water;
and adding a flocculating agent into the reoxidized and flocculated river water to flocculate and settle the river water.
2. The method for eliminating black and odorous river channels according to claim 1, wherein the method comprises the following steps: the strong oxidant comprises at least one of sodium hypochlorite and potassium hypochlorite.
3. The method for eliminating black and odorous river channels according to claim 1, wherein the method comprises the following steps: the bleaching powder is a mixture of calcium hydroxide, calcium chloride and calcium hypochlorite.
4. The method for eliminating black and odorous river channels according to claim 1, wherein the method comprises the following steps: the flocculating agent is at least one of polyaluminium chloride and polyacrylamide.
5. The method for eliminating black and odorous river channels according to claim 4, wherein the method comprises the following steps: the flocculant is a mixture of the polyaluminium chloride and the polyacrylamide; the mass ratio of the polyaluminium chloride to the polyacrylamide is 1: 3.
6. the method for eliminating black and odorous river channels according to any one of claims 1 to 5, wherein the method comprises the following steps: the mass of the strong oxidant accounts for about 20% of the total mass of the strong oxidant, the bleaching powder and the flocculating agent.
7. The method for eliminating black and odorous river channels according to claim 6, wherein the method comprises the following steps: the mass of the bleaching powder accounts for about 20% of the total mass of the strong oxidant, the bleaching powder and the flocculating agent.
8. The method for eliminating black and odorous river channels according to claim 7, wherein the method comprises the following steps: the mass of the flocculating agent accounts for about 60% of the total mass of the strong oxidizer, the bleaching powder and the flocculating agent.
9. The method for eliminating black and odorous river channels according to claims 1 to 5, wherein the method comprises the following steps: and adding the bleaching powder after 2-5 days of adding the strong oxidant.
10. The method for eliminating black and odorous river channels according to claim 9, wherein the method comprises the following steps: and adding the flocculating agent after adding the bleaching powder for 5-7 d.
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| CN202110485064.5A CN113185025A (en) | 2021-04-30 | 2021-04-30 | Method for eliminating black and odorous river channel |
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| CN202110485064.5A CN113185025A (en) | 2021-04-30 | 2021-04-30 | Method for eliminating black and odorous river channel |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1065643A (en) * | 1985-06-09 | 1992-10-28 | 樱田康之 | Effluent purification method |
| US5614102A (en) * | 1990-01-29 | 1997-03-25 | Sakurada; Yasuyuki | Method for purifying sewage |
| BRPI0903291A2 (en) * | 2009-09-02 | 2011-05-10 | Evonik Degussa Brasil Ltda | process for purifying water flowing in a river or canal |
| JP2016198702A (en) * | 2015-04-08 | 2016-12-01 | 新日鐵住金株式会社 | Flocculation and precipitation method |
| CN107162150A (en) * | 2017-07-24 | 2017-09-15 | 中山市中开环保设备制造有限公司 | Canal reactor efficient water-purifying agent and preparation method thereof |
| WO2018131650A1 (en) * | 2017-01-13 | 2018-07-19 | パナソニックＩｐマネジメント株式会社 | Water treatment device and water treatment system |
| WO2021020030A1 (en) * | 2019-07-29 | 2021-02-04 | パナソニックＩｐマネジメント株式会社 | Water treatment system |
-
2021
- 2021-04-30 CN CN202110485064.5A patent/CN113185025A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1065643A (en) * | 1985-06-09 | 1992-10-28 | 樱田康之 | Effluent purification method |
| US5614102A (en) * | 1990-01-29 | 1997-03-25 | Sakurada; Yasuyuki | Method for purifying sewage |
| BRPI0903291A2 (en) * | 2009-09-02 | 2011-05-10 | Evonik Degussa Brasil Ltda | process for purifying water flowing in a river or canal |
| JP2016198702A (en) * | 2015-04-08 | 2016-12-01 | 新日鐵住金株式会社 | Flocculation and precipitation method |
| WO2018131650A1 (en) * | 2017-01-13 | 2018-07-19 | パナソニックＩｐマネジメント株式会社 | Water treatment device and water treatment system |
| CN107162150A (en) * | 2017-07-24 | 2017-09-15 | 中山市中开环保设备制造有限公司 | Canal reactor efficient water-purifying agent and preparation method thereof |
| WO2021020030A1 (en) * | 2019-07-29 | 2021-02-04 | パナソニックＩｐマネジメント株式会社 | Water treatment system |
Non-Patent Citations (1)
| Title |
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| 边归国等: "二氧化氯和漂白粉应急处置甲藻水华", 《中国应急管理》 * |
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Application publication date: 20210730 |