CN111470743A - Method for treating black and odorous bottom mud by combining in-situ calcium nitrate injection and ecological restoration - Google Patents
Method for treating black and odorous bottom mud by combining in-situ calcium nitrate injection and ecological restoration Download PDFInfo
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- CN111470743A CN111470743A CN202010273416.6A CN202010273416A CN111470743A CN 111470743 A CN111470743 A CN 111470743A CN 202010273416 A CN202010273416 A CN 202010273416A CN 111470743 A CN111470743 A CN 111470743A
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- calcium nitrate
- bottom mud
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G22/00—Cultivation of specific crops or plants not otherwise provided for
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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
- C02F11/00—Treatment of sludge; Devices therefor
-
- 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
- C02F2101/101—Sulfur 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
-
- 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
-
- 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
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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
- C02F2209/04—Oxidation reduction potential [ORP]
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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
- C02F2303/02—Odour removal or prevention of malodour
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/40—Protecting water resources
- Y02A20/402—River restoration
Abstract
The invention discloses a method for treating black and odorous bottom mud by combining in-situ calcium nitrate injection and ecological restoration, wherein a shipborne target type dosing device is used for injecting 5-10kg of liquid calcium nitrate solution per square meter, and the depth of the liquid calcium nitrate solution injected into the bottom mud is generally 15-20 cm; planting submerged plants and emergent plants in the bottom mud within 4 weeks of injecting the liquid calcium nitrate; harvesting the submerged plant in spring or summer at a strength of 10cm, and cutting off the upper part of the emergent aquatic plant in winter to leave the rhizome. The method is quick and effective in treating the black and odorous river channel, can fundamentally improve the black and odorous bottom mud environment, is low in cost, low in energy consumption and small in environmental disturbance, is beneficial to restoring the ecological landscape of the river channel, and fundamentally restores the ecological function of the river.
Description
Technical Field
The invention relates to the technical field of riverway sediment treatment, in particular to a method for treating black and odorous sediment by combining in-situ calcium nitrate injection and ecological restoration.
Background
With the rapid development of economy in China, the acceleration of urbanization process and the increase of urban population, the discharge amount of industrial wastewater and domestic sewage is continuously increased, as the environmental protection management is poor, a large amount of sewage which is not effectively treated is directly discharged into a river channel, the environmental capacity of the river channel is greatly exceeded, the self-purification capacity of the river channel is reduced, pollutants cannot be degraded, the river ecosystem is degraded, so that a plurality of urban river channels are in a black and odorous state for a long time, and bottom mud is an important part in a natural water ecosystem and is an important link in the material circulation of a water ecosystem.
After entering the water body, the pollutants are finally deposited in the bottom mud through various ways such as precipitation, adsorption, biological absorption and the like and gradually accumulated, so that even if the exogenous pollution of the water body is controlled, the endogenous pollutants accumulated in the bottom mud still threaten the water body covering the river channel, and the treatment and the repair of the bottom mud of the black and odorous river channel are important links for improving the black and odorous river channel.
The black and odorous river sediment treatment technology can be divided into ex-situ treatment and in-situ treatment, wherein the ex-situ treatment of the sediment mainly refers to sediment dredging technology; the in-situ treatment comprises in-situ physical repair, in-situ chemical repair and in-situ biological repair technologies; compared with the heterotopic treatment technology, the sediment in-situ treatment technology can avoid the problem of secondary pollution caused in the sediment dredging and transferring process, the engineering cost is low, the in-situ chemical remediation of the sediment is an efficient sediment remediation mode, the addition of calcium nitrate is a common method for the in-situ chemical treatment of the black and odorous sediment at present, the black and odorous sediment is eliminated, the release of phosphorus in the sediment is inhibited, and the degradation of organic matters of the sediment is promoted by adding the calcium nitrate, but the single chemical remediation has only a temporary remediation effect on the black and odorous water body and the sediment, and the restoration of a destroyed water ecosystem is a long-term effective treatment measure for the black and odorous river and the black and odorous sediment. Phytoremediation is an application-wide, environment-friendly, economic and effective treatment technology, aquatic plants have good enrichment and degradation capacities on pollutants in black and odorous water and bottom mud, but the single planting of the aquatic plants has a long remediation period on black and odorous watercourses, and meanwhile, if the aquatic plants cannot be timely salvaged and harvested in the later period, plant rot is easily caused, and secondary pollution is caused.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a method for treating black and odorous bottom mud by combining in-situ calcium nitrate injection and ecological restoration, and the technology integrates the advantages of fast and efficient in-situ chemistry and long-term effectiveness of a water ecosystem constructed by aquatic plants, so that the black and odorous river bottom mud restoration effect is optimal.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a method for treating black and odorous bottom mud by combining in-situ calcium nitrate injection and ecological restoration comprises the following steps:
step 1, injecting 5-10kg of liquid calcium nitrate solution into each square meter by using a ship-borne target type dosing device, wherein the depth of the liquid calcium nitrate solution injected into bottom mud is generally 15-20 cm;
step 2, planting submerged plants and emergent plants in the bottom mud within 4 weeks of injecting the liquid calcium nitrate;
and 3, harvesting the spring terminal or summer submerged plant at the strength of 10cm, and cutting off the upper part of the emergent aquatic plant in winter to leave the rhizome.
Preferably, the submerged plant is one or more of watermifoil, curly pondweed and eel grass.
Preferably, the emergent aquatic plant is one or more of reed, canna and cattail.
Preferably, the concentration of the liquid calcium nitrate solution in the step 1 is 0.5 g/L.
Preferably, said stepsIn step 2, the planting density of the submerged plants is as follows: 4-6 from/m of myriophyllum2Each 20-30 curly pondweed and bitter grass2The planting density of emergent aquatic plants is as follows: reed 10-30/m2Canna 10-20 plants/m235-50 cattail plants/m2。
(III) advantageous effects
The invention provides a method for treating black and odorous bottom mud by combining in-situ calcium nitrate injection and ecological restoration, which has the following beneficial effects:
(1) the method combines the advantages of in-situ chemistry and in-situ bioremediation, and firstly, by injecting a calcium nitrate solution, the volatile sulfides in the bottom mud are effectively removed, the content of organic pollutants in the bottom mud is reduced, the oxidation-reduction potential of the bottom mud is increased, the bottom mud environment is quickly changed, and the black and odor phenomenon of the river channel is improved; and then, submerged plants and emergent plants are planted, the root system can directly absorb organic pollutants and heavy metal substances from sewage, and meanwhile, the aquatic plants can form a dense filter layer to purify water quality, so that good habitat conditions are created for natural recovery, survival and multiplication of aquatic organisms, the ecological function of the river is fundamentally improved, and the integrity of the river is restored.
(2) In the vigorous growth period of the aquatic plants, pollutants in the plants are removed by timely fishing and harvesting, and secondary pollution to water caused by withering and rotting of the plants can be avoided.
(3) The method is quick and effective in treating the black and odorous river channel, can fundamentally improve the black and odorous bottom mud environment, is low in cost, low in energy consumption and small in environmental disturbance, is beneficial to restoring the ecological landscape of the river channel, and fundamentally restores the ecological function of the river.
Detailed Description
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
A method for treating black and odorous bottom mud by combining in-situ calcium nitrate injection and ecological restoration comprises the following steps:
step 1, injecting 5-10kg of liquid calcium nitrate solution into each square meter by using a ship-mounted target type dosing device, wherein the concentration of the liquid calcium nitrate solution is 0.5 g/L, the concentration of the liquid calcium nitrate solution is 0.5 g/L, and the depth of the liquid calcium nitrate solution injected into bottom mud is generally 18 cm;
step 2, planting curly pondweed and bitter grass each 25 plants/m in the bottom mud within 4 weeks of injecting the liquid calcium nitrate2Canna 15 plants/m2Typha 40 plants/m2；
Step 3, cutting the curly pondweed and the bitter grasses at the intensity of 10cm in spring end or summer, and cutting off the upper parts of emergent aquatic plants in winter to leave rhizome.
Example 2
A method for treating black and odorous bottom mud by combining in-situ calcium nitrate injection and ecological restoration comprises the following steps:
step 1, injecting 5-10kg of liquid calcium nitrate solution into each square meter by using a ship-mounted target type dosing device, wherein the concentration of the liquid calcium nitrate solution is 0.5 g/L, the concentration of the liquid calcium nitrate solution is 0.5 g/L, and the depth of the liquid calcium nitrate solution injected into bottom mud is generally 18 cm;
step 2, planting the watermifoil 5 from/m in the bottom mud within 4 weeks of injecting the liquid calcium nitrate225 plants/m of tape grass220 reed/m2And canna 15 strains/m2；
And 3, harvesting the myriophyllum and the tape grass at the strength of 10cm in spring end or summer, and cutting off the upper part of the emergent aquatic plant in winter to leave the rhizome.
Experiment of
In the same river channel, four different river reach with the same pollution degree are selected, the four cases of the example 1 and the example 2, the calcium nitrate adding chemical remediation and the phytoremediation are taken as the treatment methods of the four river reach, and the AVS content in the sediment is detected every day, wherein the related data are as follows:
in conclusion, the embodiment 1 and the embodiment 2 are the technologies of the invention, the invention combines the advantages of the in-situ chemical technology and the in-situ biological repair technology, compared with the two treatment methods of the calcium nitrate chemical repair and the plant repair technology, the treatment effect of the method is quick and effective for the black and odorous river channel, and the ecological function of the river can be fundamentally recovered.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A method for treating black and odorous bottom mud by combining in-situ calcium nitrate injection and ecological restoration is characterized by comprising the following steps:
step 1, injecting 5-10kg of liquid calcium nitrate solution into each square meter by using a ship-borne target type dosing device, wherein the depth of the liquid calcium nitrate solution injected into bottom mud is generally 15-20 cm;
step 2, planting submerged plants and emergent plants in the bottom mud within 4 weeks of injecting the liquid calcium nitrate;
and 3, harvesting the spring terminal or summer submerged plant at the strength of 10cm, and cutting off the upper part of the emergent aquatic plant in winter to leave the rhizome.
2. The method for treating black and odorous bottom mud by combining in-situ calcium nitrate injection and ecological remediation according to claim 1, wherein the method comprises the following steps: the submerged plant is one or more of Focus vesiculosus, Potamogeton crispus and Sophora alopecuroides.
3. The method for treating black and odorous bottom mud by combining in-situ calcium nitrate injection and ecological remediation according to claim 1, wherein the method comprises the following steps: the emergent aquatic plant is one or more of reed, canna and cattail.
4. The method for treating black and odorous sediment by combining in-situ calcium nitrate injection and ecological restoration according to claim 1, wherein the concentration of the liquid calcium nitrate solution in the step 1 is 0.5 g/L.
5. The method for treating black and odorous bottom mud by combining in-situ calcium nitrate injection and ecological remediation according to claim 1, wherein the method comprises the following steps: in the step 2, the planting density of the submerged plants is as follows: 4-6 from/m of myriophyllum2Each 20-30 curly pondweed and bitter grass2The planting density of emergent aquatic plants is as follows: reed 10-30/m2Canna 10-20 plants/m235-50 cattail plants/m2。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010273416.6A CN111470743A (en) | 2020-04-09 | 2020-04-09 | Method for treating black and odorous bottom mud by combining in-situ calcium nitrate injection and ecological restoration |
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| CN202010273416.6A CN111470743A (en) | 2020-04-09 | 2020-04-09 | Method for treating black and odorous bottom mud by combining in-situ calcium nitrate injection and ecological restoration |
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| CN111470743A true CN111470743A (en) | 2020-07-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115159797A (en) * | 2022-06-13 | 2022-10-11 | 中国建筑第八工程局有限公司 | Method for repairing and treating black and odorous bottom mud by combining in-situ injection of micro-storage repairing agent and aquatic plants |
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| US5620893A (en) * | 1992-07-16 | 1997-04-15 | Delman R. Hogen | Microbial mediated method for soil and water treatment |
| CN105565584A (en) * | 2014-10-16 | 2016-05-11 | 上海库克莱生态科技有限公司 | Rapid method for constructing river way water ecosystem |
| CN105645686A (en) * | 2016-01-25 | 2016-06-08 | 山东大学 | Method for in-situ chemical treatment and remediation of heavily-polluted black and odorous water bottom mud |
| CN109534632A (en) * | 2017-09-21 | 2019-03-29 | 天津大学 | A kind of submerged plant-improver joint improves the in-situ remediation method of black-odor riverway bed mud |
| CN109607940A (en) * | 2018-12-12 | 2019-04-12 | 广州市水电建设工程有限公司 | A kind of river restorative procedure |
| CN109879565A (en) * | 2019-03-08 | 2019-06-14 | 上海海洋大学 | Chemistry-microorganism-ecology combined in-situ method for black and odorous water polluted bed mud reparation |
-
2020
- 2020-04-09 CN CN202010273416.6A patent/CN111470743A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5620893A (en) * | 1992-07-16 | 1997-04-15 | Delman R. Hogen | Microbial mediated method for soil and water treatment |
| CN105565584A (en) * | 2014-10-16 | 2016-05-11 | 上海库克莱生态科技有限公司 | Rapid method for constructing river way water ecosystem |
| CN105645686A (en) * | 2016-01-25 | 2016-06-08 | 山东大学 | Method for in-situ chemical treatment and remediation of heavily-polluted black and odorous water bottom mud |
| CN109534632A (en) * | 2017-09-21 | 2019-03-29 | 天津大学 | A kind of submerged plant-improver joint improves the in-situ remediation method of black-odor riverway bed mud |
| CN109607940A (en) * | 2018-12-12 | 2019-04-12 | 广州市水电建设工程有限公司 | A kind of river restorative procedure |
| CN109879565A (en) * | 2019-03-08 | 2019-06-14 | 上海海洋大学 | Chemistry-microorganism-ecology combined in-situ method for black and odorous water polluted bed mud reparation |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115159797A (en) * | 2022-06-13 | 2022-10-11 | 中国建筑第八工程局有限公司 | Method for repairing and treating black and odorous bottom mud by combining in-situ injection of micro-storage repairing agent and aquatic plants |
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