CN113501638A - Method for in-situ treatment of black and odorous water body sediment based on iron-carbon micro-battery principle - Google Patents
Method for in-situ treatment of black and odorous water body sediment based on iron-carbon micro-battery principle Download PDFInfo
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- 239000000463 material Substances 0.000 abstract description 8
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 4
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- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
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- 241000255925 Diptera Species 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
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- 238000005273 aeration Methods 0.000 description 2
- 238000012271 agricultural production Methods 0.000 description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
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- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 2
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- 239000002957 persistent organic pollutant Substances 0.000 description 2
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- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 description 1
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- 235000009496 Juglans regia Nutrition 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 244000018633 Prunus armeniaca Species 0.000 description 1
- 235000009827 Prunus armeniaca Nutrition 0.000 description 1
- 240000008866 Ziziphus nummularia Species 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
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- 230000016615 flocculation Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000004021 humic acid Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- -1 hydrogen ions Chemical class 0.000 description 1
- QOSATHPSBFQAML-UHFFFAOYSA-N hydrogen peroxide;hydrate Chemical compound O.OO QOSATHPSBFQAML-UHFFFAOYSA-N 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
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- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 1
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Classifications
-
- 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
- C02F11/006—Electrochemical treatment, e.g. electro-oxidation or electro-osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
-
- 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
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
-
- 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
Abstract
The invention belongs to the technical field of black and odorous water body sediment treatment, and discloses a method for in-situ treatment of black and odorous water body sediment based on an iron-carbon micro-battery principle, which comprises the following steps: stirring the bottom mud of the black and odorous water body to be in a boiling state, and synchronously adding the iron-carbon micro-battery substrate and the oxidation catalyst to fully mix the bottom mud, the iron-carbon micro-battery substrate and the oxidation catalyst. Wherein the adding amount of the iron-carbon micro-battery base material is 1-10% of the weight of the sludge in unit volume, the weight ratio of the scrap iron to the coke is 1: 3-3: 1, and the adding amount of the oxidation catalyst is 1-8% of the weight of the sludge in unit volume. The method can quickly eliminate the pollution of the bottom mud of the water body, improve the anaerobic environment of the bottom, synchronously remove and stabilize the heavy metals in the water body and the bottom mud, and has the nitrogen and phosphorus removal efficiency, thereby quickly recovering the self-purification function of the water body. The method is suitable for the rapid treatment of black and odorous water bodies such as polluted lakes, ponds, ditches, riverways and the like.
Description
Technical Field
The invention relates to the technical field of black and odorous water body sediment treatment, in particular to a method for in-situ treatment of black and odorous water body sediment based on an iron-carbon micro-battery principle.
Background
The black and odorous water body is an extreme embodiment of the water body blackening and odor generation due to the fact that organic pollutants in the water body exceed the self-cleaning capacity of the environment. Poor hydrodynamic conditions, accumulation of large amounts of iron and manganese metal species, and anaerobic decomposition of organic pollutants are major causes of black and odorous water bodies. Because the self-cleaning capability of the black and odorous water body is basically lost, fishes and plankton in the water are difficult to survive, and aquatic plants are seriously degraded or disappeared, the food chain is broken and the ecological environment of the water body is unbalanced, so that the surrounding ecological environment is damaged, and the daily life quality of residents is greatly reduced, and the treatment is urgently needed. In recent years, with the high importance of the country on environmental protection, the treatment technology of black and odorous water is mainly divided into three major categories, namely physical treatment, chemical treatment and biological treatment. Wherein, the physical treatment mainly comprises source control sewage interception and sediment dredging; the chemical treatment mainly comprises reinforced flocculation, medicament algae killing, active carbon and the like; the biological treatment mainly comprises microorganism strengthening purification, aquatic plant purification and the like.
The polluted bottom mud is taken as an endogenous pollution source of black and odorous water, and the restoration and treatment technology is mainly divided into an in-situ restoration technology and an ex-situ restoration technology at present, wherein the ex-situ restoration technology is difficult to popularize due to the fact that the engineering construction amount is large and negative influence is easily caused on the ecology of rivers and lakes. Therefore, the in-situ remediation technology is an ideal choice for the treatment and remediation of the polluted bottom mud.
At present, different experts, scholars and technicians develop in-situ remediation methods for black and odorous water and polluted sediment from different angles, such as: chinese patent CN201911201651.6A discloses a river ecological restoration process, which mainly comprises the following operation steps of (1) sludge excavation; (2) scouring sludge; (3) conditioning the sludge-water mixture by using a coagulant; (4) and (5) discharging the conditioned sludge to the river channel again. Chinese patent CN102874976A discloses a method for purifying black and odorous water and bottom sediment nutritive salt, which mainly comprises the steps of (1) aerating surface layer bottom sediment and overlying water; (2) settling the water body after aeration; (3) and (3) repeating the steps (1) and (2) until the concentration of pollutants such as ammonia nitrogen in the water body is reduced to a preset value and the water body is transparent. Chinese patent CN105502867A discloses a method for treating black and odorous water body sediment by using micro-electrolysis materials, which mainly comprises the following steps of (1) adding the micro-electrolysis materials and mixing the micro-electrolysis materials with the sediment; (2) injecting or spraying an oxidant into the substrate sludge of the existing micro-electrolysis material. Chinese patent CN101417840A discloses a black and odorous river pollution treatment method, which mainly comprises the steps of (1) aerating and oxygenating in sections in a river channel; (2) adding a compound microbial agent; (3) performing biological remediation on the bottom mud; (4) a biological nest system is arranged.
The previous methods for treating black and odorous water polluted bottom mud in situ generally have the defects of long construction period, low treatment efficiency, high energy consumption or difficulty in fundamentally eliminating pollutants, thus causing poor treatment effect. Therefore, the problem that needs to be solved by the technical personnel in the field is how to provide a time-saving and labor-saving treatment method for the black and odorous water body bottom mud with excellent treatment effect.
Disclosure of Invention
In view of the above, the invention provides a method for in-situ treatment of black and odorous water body bottom mud based on an iron-carbon micro-battery principle, the method can treat the black and odorous water body bottom mud by simultaneously adding an iron-carbon micro-battery substrate and an oxidation catalyst while vigorously stirring the black and odorous water body bottom mud to be in a boiling state, does not need to consume a large amount of energy, and can be applied to treatment of the static or low-flow-rate black and odorous water body bottom mud.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for in-situ treatment of black and odorous water body sediment based on the principle of an iron-carbon micro-battery, which comprises the following steps:
stirring the bottom mud of the black and odorous water body to be in a boiling state, and synchronously adding the iron-carbon micro-battery substrate and the oxidation catalyst to fully mix the bottom mud, the iron-carbon micro-battery substrate and the oxidation catalyst.
Preferably, the adding amount of the iron-carbon micro-battery base material is 1-10% of the weight of the unit bottom mud.
Preferably, the iron-carbon micro-battery base material consists of scrap iron and coke, the particle size of the scrap iron is 10-100 meshes, the particle size of the coke is larger than or equal to 10 meshes, and the weight ratio of the scrap iron to the coke is 1: 3-3: 1; the particle size of the further optimized scrap iron is 20-60 meshes, the particle size of the coke is more than 20 meshes, and the weight ratio of the scrap iron to the coke is 1: 3.
Preferably, the oxidation catalyst is one of permanganate, persulfate, ozone or hydrogen peroxide water solution, and the adding amount of the oxidation catalyst is 1-8% of the weight of the substrate sludge in unit volume; it is further preferred that the oxidation catalyst is a hydrogen peroxide solution and is added in an amount of 5% by weight of the substrate sludge per volume.
Preferably, the mass fraction of the permanganate and the persulfate is not less than 10%.
Preferably, the mass fraction of ozone is not less than 1%.
Preferably, the mass fraction of hydrogen peroxide is not less than 3%.
Preferably, the linear velocity of the leaf surface of the equipment with the stirring bottom mud in the boiling state is more than or equal to 5 m/s.
The working principle of the invention is as follows: scrap iron, coke particles and polluted bottom mud are stirred and mixed to form a plurality of iron-carbon micro-batteries, wherein the scrap iron is used as an anode and a coke crop cathode, the two substances generate a larger potential difference in the process of redox reaction, generated nascent state ferrous ions and atomic hydrogen have higher chemical activity, and the degradation-resistant high molecular organic matters in the sludge can be subjected to chain scission and ring opening; meanwhile, with the synchronous addition of the oxidation catalyst, humic acid in the sludge is rapidly oxidized and decomposed, and chromophoric groups of pollutants are destroyed. In addition, a large amount of air can be brought into the bottom sludge in the high-speed stirring process of the polluted bottom sludge, so that the aeration reaction of iron and carbon is enhanced, the generated hydrogen ions are consumed, the anaerobic state of the bottom sludge is improved, and the catalytic oxidation environment of the sludge bottom sludge is further improved. Through the process, the black and odorous water body is eliminated in a short time, and the stabilization of the bottom mud is realized.
In the process, ferric hydroxide (ferrous) generated by the reaction of the iron-carbon micro-battery is a good colloid flocculant, and can adsorb and coagulate suspended matters in the water body and remove heavy metal ions, so that the heavy metal ions in the black and odorous water body and the bottom mud are passivated, and the synchronous treatment of heavy metal pollution in the black and odorous water body and the bottom mud is realized.
According to the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the method has the advantages of high speed and stable and lasting effect in treating the black and odorous water polluted bottom mud. In the method, a micro primary battery formed by countless iron chips and coke generates a large amount of high-activity ferrous ions and atomic hydrogen to decompose refractory macromolecular organic matters in the bottom mud into micromolecular substances; meanwhile, along with the mechanical high-speed stirring and the synchronous adding of the oxidant, the contact reaction rate of pollutants in the black and odorous water body and the bottom mud and high-activity oxidizing groups is further improved, so that the pollutants can be quickly oxidized and removed. In addition, the ferric hydroxide colloid flocculant produced in the implementation process can adsorb and remove nitrogen and phosphorus substances in the water body and the bottom sediment, and passivate heavy metal ions, so that the environment of the treated water body and the bottom sediment is in a long-term stable state.
2. The waste is treated by waste, and the economic benefit is good. The scrap iron used in the method is waste iron generated in the industrial production process, and has the advantages of wide raw material source, easy obtainment and low price; the coke used can be made from wood, shell, coconut shell, walnut shell, apricot shell, jujube shell and other waste in agricultural production. Therefore, the raw materials used in the method are all from wastes in industrial and agricultural production and processing, the production and processing cost is low, a large amount of cost can be saved for engineering implementation, and the economic benefit is good.
3. The construction is convenient and fast, the efficiency is high, and a large amount of energy consumption can be reduced. The method can be implemented by synchronously adding the iron chips, the coke and the oxidant in the process of stirring the bottom mud, so that the synchronous treatment of the black and odorous water body and the polluted bottom mud can be completed at one time, step-by-step implementation and repeated operation of various machines are not needed, the construction flow is simplified, the implementation efficiency is improved, and the energy consumption in engineering construction is greatly reduced.
4. The raw materials are simple and convenient to combine and match, and convenient to transport and store, and the convenience and the popularization of the method are greatly improved. The iron chips and the coke particles used in the method are solid, so that large-scale production and packaging can be realized; solid encapsulation can be realized by adopting the solid or liquid oxidation catalyst, so that long-distance transportation and storage of raw materials can be realized, and then flexible allocation and application can be carried out according to the field condition, thereby improving the flexibility and convenience of the method, and being beneficial to popularization and application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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
The black and odorous water body of the embodiment is selected to the sewer beside a certain refuse landfill, the width of the sewer is about 0.5 meter, the length of the sewer is about 120 meters, the thickness of black and odorous bottom mud is about 30cm, and the concentration of the black and odorous bottom mud is about 1.05g/cm3The water in the drain is black and smelly and mosquitoes and flies are bred due to the perennial collection of the landfill leachate, and the CODcr of the water in the drain is as high as 30000mg/L, BOD5Only 2500mg/L, NH4N is as high as 7000mg/L, B/C is about 0.08, and biodegradability is poor. After the garbage leachate is cut off and is converged into a source, 50kg of scrap iron, 150kg of coke and 945kg of hydrogen peroxide with the mass fraction of 30% are synchronously added according to the invention and are rapidly stirred, after 1 hour, the black odor disappears, the water quality becomes clear, the black odor bottom mud is changed into grey white, and after 6 months of treatment, the water quality and the bottom mud are stable.
Example 2
In this embodiment, a closed lake in a park of a certain city is selected, no exogenous water source is imported, and the area is about 500m2The perennial water accumulation depth of the lake is about 1.5m, the thickness of the black and odorous bottom mud is about 25cm, and the concentration of the black and odorous bottom mud is about 1.08g/cm3The water body is dark green due to the falling of dry branches and fallen leaves and the bait thrown into the pond by the tourist all the year round, the fishes in the pond are basically extinct, and the bottom mud is black and sticky. According to the method, the lake bottom sludge is rapidly stirred by a machine to be in a boiling state, 3000kg of iron-carbon micro-battery base material and 2500kg of sodium persulfate are added according to the proportion of 2:3, and after the construction is finished and is static for 6 hours, the lake water body is dark green and disappears, the water body is clear and transparent, and the black, odorous and viscous bottom sludge is converted into yellow brown loose clay particles. The ammonia nitrogen in the water body is reduced to 3mg/L from the original 21mg/L, the phosphorus content is reduced to 2mg/L from the original 12mg/L, the dissolved oxygen is increased to 5.1mg/L from 0.32mg/L, and the pH value is increased to 8.1 from 5.2. The project implementation is nearly 14 months till now, and the water body and bottom mud of the lake and the pond do not have any deteriorationAnd (4) indication.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A method for in-situ treatment of black and odorous water body bottom mud based on an iron-carbon micro-battery principle is characterized by comprising the following steps:
stirring the bottom mud of the black and odorous water body to be in a boiling state, and synchronously adding the iron-carbon micro-battery substrate and the oxidation catalyst to fully mix the bottom mud, the iron-carbon micro-battery substrate and the oxidation catalyst.
2. The method for in-situ treatment of the black and odorous water body sediment based on the iron-carbon micro-battery principle according to claim 1, wherein the adding amount of the iron-carbon micro-battery substrate is 1-10% of the weight of the unit sediment.
3. The method for in-situ treatment of black and odorous water body sediment based on the iron-carbon micro-battery principle according to claim 1 or 2, wherein the iron-carbon micro-battery substrate is composed of scrap iron and coke; the particle size of the scrap iron is 10-100 meshes, the particle size of the coke is larger than or equal to 10 meshes, and the weight ratio of the scrap iron to the coke is 1: 3-3: 1.
4. The method for in-situ treatment of the black and odorous water body bottom mud based on the iron-carbon micro-battery principle according to claim 3, wherein the adding amount of the oxidation catalyst is 1-8% of the weight of the bottom mud per unit volume.
5. The method for in-situ treatment of black and odorous water body bottom sludge based on the iron-carbon micro-battery principle as claimed in claim 1, wherein the oxidation catalyst is one of permanganate, persulfate, ozone or aqueous hydrogen peroxide.
6. The method for in-situ treatment of black and odorous water body bottom mud based on the iron-carbon micro-battery principle as claimed in claim 5, wherein the mass fraction of the permanganate and the persulfate is not lower than 10%.
7. The method for in-situ treatment of the black and odorous water body bottom sediment based on the iron-carbon micro-battery principle according to claim 5, wherein the mass fraction of the ozone is not less than 1%.
8. The method for in-situ treatment of the black and odorous water body bottom sediment based on the iron-carbon micro-battery principle as claimed in claim 5, wherein the mass fraction of the hydrogen peroxide is not less than 3%.
9. The method for in-situ treatment of the black and odorous water body sediment based on the iron-carbon micro-battery principle according to claim 1, wherein the linear velocity of the leaf surface of equipment stirring the sediment in a boiling state is more than or equal to 5 m/s.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110887266.2A CN113501638A (en) | 2021-08-03 | 2021-08-03 | Method for in-situ treatment of black and odorous water body sediment based on iron-carbon micro-battery principle |
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| US20210213498A1 (en) * | 2020-01-15 | 2021-07-15 | Specialty Earth Sciences, Llc | Controlled release adjunct for contaminant treatment |
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| CN105502867A (en) * | 2016-02-06 | 2016-04-20 | 广东灵捷制造化工有限公司 | Method for treating black and odorous water body bottom mud through microelectrolysis material |
| CN109111065A (en) * | 2018-08-07 | 2019-01-01 | 上海久树环境科技有限公司 | A kind of riverbed ecology synthesis restorative procedure |
| CN109574157A (en) * | 2018-11-21 | 2019-04-05 | 南京清科中晟环境技术有限公司 | A kind of environmentally friendly natural minerals water body purifying material |
| US20210213498A1 (en) * | 2020-01-15 | 2021-07-15 | Specialty Earth Sciences, Llc | Controlled release adjunct for contaminant treatment |
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