CN111153585A - Environment-friendly dredging and recycling method for polluted bottom mud - Google Patents
Environment-friendly dredging and recycling method for polluted bottom mud Download PDFInfo
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- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
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- 238000005265 energy consumption Methods 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 1
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
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- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229920006284 nylon film Polymers 0.000 description 1
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 1
- 239000012286 potassium permanganate Substances 0.000 description 1
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- 239000004576 sand Substances 0.000 description 1
- 229910052979 sodium sulfide Inorganic materials 0.000 description 1
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 1
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- 239000002699 waste material Substances 0.000 description 1
- 239000003643 water by type Substances 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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
-
- 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
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/143—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using inorganic substances
-
- 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
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses an environment-friendly dredging and resource recycling method for polluted bottom mud, which is characterized in that a concentrated bottom mud repairing agent is prepared in a water tank of an impermeable membrane of an on-site earth covering worker by utilizing treated water, the concentrated bottom mud repairing agent is sprayed to the polluted bottom mud to be dredged as a water source of a high-pressure water gun for hydraulic dredging of the bottom mud, so that dredging and pesticide application are synchronously completed, the formed slurry containing a pesticide is further sent into a soil engineering pipe bag through a grid and a slurry pump to complete dehydration, drying and solidification, and the treated bottom mud can be used as a foundation, a dam and the like of a landscape greening land for resource utilization. The method has the characteristics of simple process, convenient operation, energy conservation, high efficiency and low cost.
Description
Technical Field
The invention belongs to the technical field of environment-friendly treatment of water body pollution of rivers, lakes, reservoirs and the like and recycling of solid wastes, and particularly relates to an environment-friendly desilting and recycling method for polluted bottom mud.
Background
According to the publication of environmental conditions in China in 2014, among 968 national control surface water monitoring sections (point positions) of 423 main rivers and 62 major lakes (reservoirs) in China, the section of water quality exceeding class III accounts for 36.9%, and the main pollution indexes comprise chemical oxygen demand, total phosphorus and five-day biochemical oxygen demand. 40.3% of the river water in the yellow river basin exceeds the III-class water standard; 43.6% of river water in the Huaihe river basin exceeds the III-class water standard; 60.9 percent of river water in the sea river basin exceeds the III-class water standard, wherein the cross section of the sea river inferior V-class water quality accounts for 37.5 percent. According to data published in an urban black and odorous water body remediation working conference called by China housing and urban and rural construction department in 2016, only 77 cities in 295 and above cities in China can not find black and odorous water bodies at present; 1861 black and odorous water bodies are detected in the rest 218 cities, wherein the number of rivers 1595 accounts for 85.7%; 266 lakes and ponds and 14.3 percent. The black and odorous water body often presents overproof eutrophication and heavy metal pollution of nitrogen, phosphorus and the like. The water body pollution source mainly comprises endogenous pollution and exogenous pollution, wherein the polluted bottom mud in the water body belongs to the endogenous pollution. At present, China is vigorously promoting 'beautiful China' and ecological civilization construction, huge manpower, material resources and financial resources are invested in water pollution environmental protection treatment projects around the country in order to meet the direction of people to a beautiful life, certain environmental protection treatment effects are obtained, however, after water quality reaches standards and is accepted, water quality of water is deteriorated within 1 year-3 years, the reason is that the temporary solution is not treated, and proper treatment and restoration are not carried out on endogenous pollution, namely water pollution bottom mud.
At present, some patent technologies in the above fields can be used for environmental protection treatment of bottom mud in polluted water bodies, for example, as patent publication No. CN01132079.6, a method for treating heavy metal sludge in cities and surrounding rivers is proposed, i.e. a method for constructing a dam, draining, filling the sludge, and finally isolating and burying by using a nylon film on site is proposed. The patent publication No. CN200510095750.2 proposes to use a mud-filled pipe bag to realize the in-situ dewatering of the sludge in urban waters, i.e. the sludge with a water content of about 90% is directly pumped into the pipe bag by dredging equipment, the method has low investment for one time, the dewatering is mainly assisted by the self-weight action, but the method does not consider the flocculation conditioning of the sludge to enhance the dewatering effect, and does not relate to the method for restoring the polluted bottom mud environment. The invention patent with the application number of 200520044977.X discloses an environment-friendly dredging reamer head device for reducing the silt diffusion, which also solves the problem of secondary pollution by pumping slurry through a closed pipeline, but does not relate to treatment methods of dewatering and recycling dredging slurry and the like. The patent publication No. CN 101693590A proposes a treatment method for sludge polluted by heavy metals, which combines sludge dredging, heavy metal stabilization and sludge dewatering and volume reduction together, although the method can ensure that the sludge dredging and dewatering process does not generate secondary heavy metal pollution, the equipment investment is less, the energy consumption in the treatment process is low, the heavy metal leaching content of the treated sludge can meet the requirement of sludge treatment in the future, but the technical requirement is very high, and professional personnel are required to guide the operation. However, for the treatment and remediation of a large amount of black and odorous eutrophic nitrogen and phosphorus polluted water body bottom sediment, how to find a method for the treatment and remediation of polluted bottom sediment, which is simpler and more convenient to operate in engineering, obvious in treatment effect and more economical in cost, remains a major challenge faced by workers in the vast environment-friendly industry.
Disclosure of Invention
The purpose of the invention is: aiming at the defects of the existing water body pollution sediment treatment technology, the method for environment-friendly dredging and recycling the polluted sediment is provided, the dredging of the polluted sediment is not limited by the weight of dredging equipment, the chemical adding and sediment dredging operations are combined by utilizing a hydraulic dredging method, chemical adding equipment facilities and operation operations are not needed, the investment is greatly saved, meanwhile, the dredged sediment is directly filled into a soil engineering pipe bag through a slurry pump for efficient dehydration and volume reduction, and the dehydrated soil engineering pipe bag is directly used as a landscaping park land base for resource utilization, so the method is mainly suitable for solving the key problems of chemical adding, dredging, sediment resource utilization and the like of the sediment under the condition of more garbage and sundries in the black and odorous water body.
The above object of the present invention is achieved by the following technical means: a method for environmental protection dredging and resource utilization of polluted bottom mud is characterized in that: firstly, determining the desilting depth and range of polluted bottom mud through bottom mud pollution investigation; then sending the sewage in the polluted water body into a sewage treatment system for standard treatment and discharge until the bottom sludge is covered with water and drained; then, preparing a concentrated bottom sediment repairing medicament in a water tank of the anti-seepage membrane of the field earth covering worker by utilizing the treated water, connecting a high-pressure pump through a tee joint to spray a high-pressure water column containing the medicament, and further sending the high-pressure water column into a high-pressure water gun for hydraulic bottom sediment dredging to spray the polluted bottom sediment to be dredged; further, the formed slurry containing the medicine enters a slurry pump through a grating, and is pumped into a geotechnical tube bag for dewatering and volume reduction through the slurry pump, and dewatering, drying and solidifying are completed in the geotechnical tube bag; and finally, directly carrying out resource utilization on the slurry containing the medicament as the foundation of the landscape greening land in situ after the dehydration and consolidation of the soil engineering pipe bags, or carrying out resource utilization on the dehydrated and consolidated soil engineering pipe bags after the dehydration and consolidation soil engineering pipe bags are cut open, and carrying out ectopic delivery on the dewatered and treated bottom mud to the landscape greening land through an excavating machine to be used as the earthwork resource utilization.
The method for environment-friendly dredging and recycling of polluted bottom mud is characterized in that a ① bottom mud repairing agent comprises one or more of a flocculation conditioner, a heavy metal stabilizer, a gel breaking oxidant and a pH regulator, wherein the flocculation conditioner comprises one or more of polyacrylamide, polyferric sulfate, polyaluminium sulfate, ferric sulfate and aluminum sulfate, preferably cationic polyacrylamide, the heavy metal stabilizer comprises sodium sulfide, thiourea and thiourea compounds, preferably thiourea compounds, the gel breaking oxidant comprises hydrogen peroxide, potassium permanganate, persulfate and fenton reagents, preferably fenton reagents, the pH regulator comprises sulfuric acid, nitric acid, hydrochloric acid, sodium hydroxide, potassium hydroxide and a pH buffer solution, a grid used for blocking garbage sundries in mud is mainly used for the mud, a geotextile bag used for ③ is made of polyethylene or polypropylene, cloth is produced by adopting a membrane filament splitting process, the durability in a 500-hour ultraviolet irradiation test is higher than 90%, a geotextile bag filling, dewatering and solidifying cycle time of 0-10, preferably, a bottom mud bag used for 5-8 times is manufactured by a film filament process, and the roadbed soil reclamation method also comprises a set of a slurry pump, a water gun, a high-pressure soil mat and a high-pressure seedling raising fertilizer.
The invention can be widely used for treating the bottom mud polluted by water bodies such as rivers, lakes, reservoirs and the like and recycling solid wastes, is particularly suitable for treating and repairing the bottom mud polluted by small-sized sewage receiving pits and river channels, treating endogenous pollution of a large amount of black and odorous water bodies and repairing the heavy metal bottom mud slightly polluted and solid powder waste residues, and realizes the resource utilization of the bottom mud and the solid wastes. The invention has the following advantages: the technical method has the advantages of simple process, high efficiency, energy conservation, low investment and operation cost, integrates the functions of adding chemicals into the bottom sludge and dredging, and realizes the proper restoration and resource recycling of the polluted bottom sludge.
[ description of the drawings ]
FIG. 1 is a schematic view of an environment-friendly desilting and recycling method for polluted bottom sludge
In the figure: 1. a sewage treatment system; 2. a bottom sediment remediation agent dosing system; 3. a high pressure pump; 4. a high pressure water gun; 5. covering water on the bottom mud; 6. polluting the bottom mud; 7. a grid; 8. cofferdam; 9. a slurry pump; 10. a geotextile tube bag dehydration volume reduction system; 11. a landscape park green space foundation; 12. a pool with an impermeable geomembrane.
[ 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.
As shown in attached figure 1, the embodiment of the invention is a method for environment-friendly dredging, repairing and resource utilization of bottom mud adopted by 10 ten thousand-square lightly polluted bottom mud aiming at the project of treating black and odorous water bodies in a Qiqi Haohong Yanxi sewage pond: firstly, according to HJ25.1-2014 site environment survey technical guide' point distribution sampling according to a grid system of 40 meters multiplied by 40 meters is carried out, the pollution degree of bottom mud is detected, and thus the desilting range and depth of the slightly polluted bottom mud are determined by combining the remediation target value of the polluted bottom mud. And treating the substrate sludge overlying water by using a sewage treatment system, and feeding the treated water serving as a high-pressure water gun and dispensing water into a water tank paved with a HDPE (high-density polyethylene) impermeable geomembrane with the thickness of 1.5mm for regeneration and reuse. Adding a liquid cationic polyacrylamide type heavy metal stabilizer (self-made product model: REME 100) of a bottom mud remediation agent into a water tank, preparing a high-concentration solution according to the mass percent of 1%, respectively pumping the high-concentration solution and bottom mud overlying water into 6 sets of high-pressure water guns by 3 sets of high-pressure pumps through a tee joint according to the volume ratio of 1: 1-4, carrying out hydraulic dredging on the polluted bottom mud by using the high-pressure water guns, changing the solid polluted bottom mud into slurry with the water content of 90% +/-5%, and stirring, mixing and reacting the bottom mud remediation agent and the polluted bottom mud in the dredging process. Mud is directly pumped into a geotechnical pipe bag dewatering and volume reducing system through a grid by 3 sets of mud pumps, the specification of each geotechnical pipe bag adopts a large split-film filament type geotechnical pipe bag which is 20 meters in circumference and 40 meters in length and is woven by polyethylene materials, and the durability of the 500-hour ultraviolet irradiation test is 93 percent; and (3) after the slurry is repeatedly and circularly operated for 6 times in the process of filling, dehydrating and consolidating the geotechnical pipe bags, and finally after 3 months of consolidation, dehydration and consolidation, the water content of the sediment is reduced to below 50%. The geotechnical pipe bag dehydration volume reduction site is directly used as a planned future landscape park greening land foundation for resource utilization, and the construction time sequence is as follows: the method comprises the steps of firstly isolating the dehydration site area from the original black and odorous water body by adopting a clay cofferdam, then draining water and treating polluted bottom mud, reinforcing the foundation, then laying a geotextile tube bag, filling, dehydrating and consolidating, and finally covering 1 m of soil to be used as a landscape greening land. In addition, by utilizing the technical method, part of the sand-containing bottom mud in the project is desilted, then is filled into the soil engineering pipe bag for dehydration, and then is directly used as a water-proof dam for resource utilization.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A method for environmental protection dredging and resource utilization of polluted bottom mud is characterized in that:
(1) firstly, determining the desilting depth and range of polluted bottom mud through bottom mud pollution investigation;
(2) then sending the sewage in the polluted water body into a sewage treatment system for standard treatment and discharge until the bottom sludge is covered with water and drained;
(3) then, preparing a concentrated bottom sediment repairing medicament in a water tank of the anti-seepage membrane of the field earth covering worker by utilizing the treated water, connecting a high-pressure pump through a tee joint to spray a high-pressure water column containing the medicament, and further sending the high-pressure water column into a high-pressure water gun for hydraulic bottom sediment dredging to spray the polluted bottom sediment to be dredged;
(4) further, the formed slurry containing the medicine enters a slurry pump through a grating, and is pumped into a geotechnical tube bag for dewatering and volume reduction through the slurry pump, and dewatering, drying and solidifying are completed in the geotechnical tube bag;
(5) and finally, directly carrying out resource utilization on the slurry containing the medicament as the foundation of the landscape greening land in situ after the dehydration and consolidation of the soil engineering pipe bags, or carrying out resource utilization on the dehydrated and consolidated soil engineering pipe bags after the dehydration and consolidation soil engineering pipe bags are cut open, and carrying out ectopic delivery on the dewatered and treated bottom mud to the landscape greening land through an excavating machine to be used as the earthwork resource utilization.
2. The method for environmental-friendly dredging and resource utilization of polluted bottom sludge as claimed in claim 1, wherein the bottom sludge remediation agent mainly comprises one or more of flocculation conditioner, heavy metal stabilizer, gel breaking oxidant and pH regulator.
3. The method for environmental desilting and recycling of polluted bottom mud as claimed in claim 1, wherein the used grating is mainly used for intercepting garbage impurities in the mud.
4. The method for environmental-friendly dredging and resource utilization of polluted bottom mud as claimed in claim 1, wherein the used geotextile tube bag is made of polyethylene or polypropylene, the cloth is produced by adopting a split-film yarn process, and the durability in the 500-hour ultraviolet irradiation test is higher than 90%.
5. The method for environmental dredging and resource utilization of the polluted bottom mud as claimed in claim 1, wherein the number of cycles of filling, dewatering and consolidating the geotextile tube bag is 0-10 times, preferably 5-8 times.
6. The method as claimed in claim 1, wherein the method of utilizing the bottom mud as a resource includes but is not limited to constructing a dam, using the bottom mud as a fertilizer, using the bottom mud as a bedding soil, and using the bottom mud as a substrate for raising seedlings in agriculture.
7. The method for environmental desilting and recycling of polluted bottom sediment as claimed in claim 1, wherein the number of high-pressure pumps, high-pressure water guns and mud pumps required for hydraulic desilting of the bottom sediment is not less than 1.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111892275A (en) * | 2020-07-16 | 2020-11-06 | 天津大学 | Method for ecological bank protection after dehydration of eutrophic polluted bottom mud geotextile tube bags |
| CN113317164A (en) * | 2021-06-17 | 2021-08-31 | 长江水利委员会长江科学院 | Method and device for improving planting soil through in-situ solidification of river and lake bottom mud |
| CN113652998A (en) * | 2021-08-11 | 2021-11-16 | 中国建筑第八工程局有限公司 | Construction method for treating waste puddles and reconstructing water system landscape |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111892275A (en) * | 2020-07-16 | 2020-11-06 | 天津大学 | Method for ecological bank protection after dehydration of eutrophic polluted bottom mud geotextile tube bags |
| CN113317164A (en) * | 2021-06-17 | 2021-08-31 | 长江水利委员会长江科学院 | Method and device for improving planting soil through in-situ solidification of river and lake bottom mud |
| CN113317164B (en) * | 2021-06-17 | 2023-07-18 | 长江水利委员会长江科学院 | Method and device for improving planting soil by in-situ solidification of river and lake bottom mud |
| CN113652998A (en) * | 2021-08-11 | 2021-11-16 | 中国建筑第八工程局有限公司 | Construction method for treating waste puddles and reconstructing water system landscape |
| CN113652998B (en) * | 2021-08-11 | 2022-08-30 | 中国建筑第八工程局有限公司 | Construction method for waste puddle treatment and water system landscape reconstruction |
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