Construction method for improving water conservancy river regulation system

Abstract

The invention belongs to the technical field of engineering construction and environmental governance, and particularly relates to a construction method for improving a water conservancy river regulation system. Effective dredging treatment is carried out on the river channel in a cofferdam mode, and pollution of river bottom sludge to the river channel is avoided; meanwhile, the sludge treatment agent is added into the sludge for treatment, so that the sludge can be harmlessly treated, the treated sludge can be used as slope protection soil and nutrient compost, and the purposes of environmental protection and resource utilization are achieved. After the sludge is treated, the water quality is further purified; heavy metals, microorganisms and organic pollutants in the river sludge are degraded by using the water purifying agent, so that the treatment of water pollution is realized, and a benign micro-ecological cycle is formed. Finally, a vegetation slope protection area is built on the bank side of the river channel, and environment greening is achieved; and meanwhile, an ecological concrete area is built and protected to the slope surface, and integration of safety protection and ecological greening can be achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering construction and environmental management, and specifically relates to a construction method for improving a water conservancy river management system. Background Art

[0002] With the rapid development of my country's economy, the construction of water conservancy projects has brought convenience to people's livelihood, but the environmental problems of my country's water conservancy rivers have become increasingly prominent. Affected by human activities, many rivers have been polluted to a certain extent, such as excessive levels of heavy metals, organic matter, suspended particles, etc. Some rivers are seriously polluted and even produce foul odors, which seriously affects the ecological environment and people's living environment.

[0003] Therefore, in order to improve river water quality and meet environmental protection requirements, it is necessary to improve the water conservancy and river management system, and then create a harmonious and sustainable living environment. There are also many research reports on river management methods. For example, a document discloses a method for river management, which mainly increases the oxygen content in the water by setting up aeration and filtration devices to improve the water quality environment. However, its energy consumption is high, and the river management is not thorough. In the prior art, when using traditional water conservancy engineering technology and equipment to manage water conservancy rivers, there are inevitably technical problems of high energy consumption and low efficiency.

[0004] In summary, in order to solve the problems of high energy consumption, low efficiency and achieve good ecological restoration, it is urgent to study a construction method to improve the water conservancy and river management system. Summary of the invention

[0005] In response to the shortcomings of the existing technology, the present invention provides a construction method for improving the water conservancy and river management system, solves the technical problems of high energy consumption and low efficiency, realizes the effective management of water conservancy and river pollution, and meets the requirements of building sustainable ecological development in the new era.

[0006] In order to achieve the above purpose, the specific steps of the present invention are:

[0007] Step 1: First, measure the length, width and water depth of the river channel, which are recorded as L1, W1 and H1 respectively; then detect the silt accumulation in the river channel and measure the silt depth, which is recorded as H2;

[0008] Step 2: Then divide the river channel into N sections, where N is a positive integer; the length of each section is L1 / N; and cofferdam treatment is performed with L1 / N as the length, W1 as the width, and H3 as the height, where H3 is greater than (H1+H2);

[0009] Step 3: After the cofferdam treatment is completed, the cofferdam area is desilted; the desilting treatment steps are as follows: first, water is pumped out, and after the water is pumped out, the sludge is stirred, and impurities and garbage in the sludge are removed; after the sludge is stirred, it is mixed with the residual river water to form a mud-water mixture; and the mud-water mixture is pumped out of the cofferdam area and stored in a sludge collection pool set up on the shore; after the mud-water mixture is pumped out of the cofferdam area, water is added to the cofferdam area again to wash the remaining sludge, and then it is pumped out again to the sludge collection pool; and the operation is repeated until the sludge in the cofferdam area is cleared;

[0010] Step 4: Add sludge treatment agent into the sludge collection pool, stir evenly, and dry it to complete the sludge treatment; dig trenches evenly on the river bank, first lay gravel at the bottom to form a filter layer, and then fill the treated and dried sludge into the trenches to form a silt soil slope protection layer. At the same time, the silt soil slope protection layer can be used as soil fertilizer to provide nutrition for vegetation; the dosage of the sludge treatment agent is 300-500g / m 2 ; The sludge treatment agent is composed of a water-absorbing resin, calcium peroxide, diatomaceous earth, a sewage treatment agent and Bacillus subtilis powder; wherein the mass ratio of the water-absorbing resin, calcium peroxide, diatomaceous earth, the sewage treatment agent and the Bacillus subtilis powder is 3-4:2-3:2-3:3-4:0.5-1;

[0011] Step 5: After the sludge is treated, the river water is pumped into the cofferdam area again and a river water purifier is added; the amount of the river water purifier added is 100-200g / m 2 The purifier is composed of the following substances in parts by weight: 1-2 parts of nano titanium dioxide, 6-8 parts of fly ash, 2-4 parts of humic acid, 0.5-2 parts of citric acid, and 1-3 parts of clay;

[0012] Step 6: River channel reinforcement construction:

[0013] First, diamond mesh is laid on the surface of the silt slope protection layer, and then dried silt is laid again, and herbaceous plants are planted to consolidate the soil to form a vegetation slope protection area; finally, ecological concrete is laid in the vegetation slope protection area extending downward to the area along the river to achieve the combination of engineering protection and ecological restoration.

[0014] Preferably, the step of extracting the mud-water mixture from the cofferdam area in step 3 is to use a pump to transport the mud-water mixture through a mud delivery pipeline to a mud collection pool on the shore;

[0015] Preferably, the impurities and garbage in step 3 include stones and domestic garbage;

[0016] Preferably, the number of repetitions in step 3 is 2-4 times;

[0017] Preferably, in step 4, the depth of the gully is 1-1.5 m and the width is 0.8-1 m.

[0018] Preferably, the water-absorbing resin in step 4 includes sodium carboxymethyl cellulose and polyacrylamide.

[0019] Preferably, the sewage treatment agent in step 4 includes cationic polyacrylamide and anionic polyacrylamide.

[0020] Preferably, the preparation steps of the purifier in step five are as follows: first, nano titanium dioxide, fly ash, humic acid and citric acid are mixed to form a mixed system, then water is added and stirred evenly, and then clay is added, and after calcination, the purifier is obtained.

[0021] Preferably, the mass ratio of the mixed system to water is 1:0.5-1.5; the calcination temperature is 200-300°C, the time is 6-12h, and the heating rate is 3-5°C / min.

[0022] Preferably, the herbaceous plant in step six is ​​buffalo grass, Amorpha fruticosa, red fescue or small bran grass.

[0023] The beneficial effects of the present invention are:

[0024] 1. The present invention effectively desilts the river channel, effectively solving the pollution of the river channel caused by the riverbed silt; at the same time, since the silt contains a large amount of organic matter, which far exceeds the natural decomposition capacity, it is easy to form an organic pollution; the present invention adds a silt treatment agent for treatment, which can not only treat the silt harmlessly, but also use the treated silt as slope protection soil and nutrient compost, effectively avoiding the secondary pollution of river channel silt and achieving the purpose of environmental protection and resource utilization.

[0025] 2. After the sludge treatment, the present invention further purifies the water quality; the prepared water purifier can effectively adsorb and fix the heavy metal ions and phosphates in the river sludge, and can quickly degrade the microorganisms and organic pollutants in the river sludge, thereby achieving the control of water pollution and forming a benign microecological cycle.

[0026] 3. The present invention first establishes a vegetation slope protection area on the bank of the river, realizing ecological management and greening environment while reinforcing the river. At the same time, an ecological concrete area is established. The main body of the ecological concrete uses specific particle size aggregate as the supporting skeleton and is wrapped by ecological cementitious materials and aggregates; it has high strength and many connected pores, which can provide conditions for the penetration and growth of plants; at the same time, the planting concrete has low alkalinity and is suitable for plant growth. It is protected and built on the slope surface, which can realize the integration of safety protection and ecological greening.

[0027] In summary, the construction method of the present invention effectively absorbs the silt in the river channel and achieves the purpose of resource utilization; at the same time, it realizes water purification and ecological slope protection, which is in line with the requirements of building sustainable ecological development in the new era. DETAILED DESCRIPTION

[0028] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0029] It should be understood that the terms described in the present invention are only for describing special embodiments and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. Each smaller range between the intermediate value in any stated value or stated range and any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0030] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0031] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention without departing from the scope or spirit of the present invention. Other embodiments obtained from the present invention description will be apparent to those skilled in the art.

[0032] Embodiment 1:

[0033] Step 1: First, measure the length, width, and water depth of the river channel (in meters), which are recorded as L1, W1, and H1 respectively; then detect the silt accumulation in the river channel and measure the silt depth, which is recorded as H2 (in meters);

[0034] Step 2: Then divide the river channel to be managed into N sections, where N is a positive integer; the length of each section is L1 / N; and cofferdam treatment is carried out with L1 / N as the length, W1 as the width, and H3 as the height, where H3 is 0.5m higher than (H1+H2);

[0035] Step 3: After the cofferdam treatment is completed, the cofferdam area is desilted; the desilting process is as follows: first, water is pumped out, and after the water is pumped out, the sludge is stirred, and stones and domestic garbage in the sludge are removed; after the sludge is stirred, it is mixed with the residual river water to form a fluid mud-water mixture; and the mud-water mixture is pumped out of the cofferdam area and stored in a sludge collection pool set up on the shore; after the mud-water mixture is pumped out of the cofferdam area, water is added to the cofferdam area again to wash the remaining sludge, and then it is pumped out again to the sludge collection pool; this operation is repeated twice until the sludge in the cofferdam area is cleared;

[0036] The mud-water mixture is pumped out of the cofferdam area and transported to the sludge collection pool on the shore through the mud pipeline by using a pump;

[0037] Step 4: firstly, sodium carboxymethyl cellulose, calcium peroxide, diatomaceous earth, cationic polyacrylamide and Bacillus subtilis powder are mixed in a mass ratio of 4:3:2:3:1 to obtain a sludge treatment agent;

[0038] Then add sludge treatment agent into the sludge collection tank, the dosage is 300g / m 2 ; After stirring evenly, dry it to complete the treatment of the silt; and evenly dig a gully with a depth of 1m and a width of 1m on the bank of the river, and lay gravel (depth of 30cm) at the bottom of the gully to form an inverted filter layer, and then fill the treated and dried silt into the gully to form a silt soil slope protection layer (depth of 30cm), which can also be used as soil fertilizer to provide nutrition for the surrounding vegetation;

[0039] Step 5:

[0040] The components of the purifier are as follows: 2 parts of nano titanium dioxide, 6 parts of fly ash, 2 parts of humic acid, 1 part of citric acid, and 2.5 parts of clay.

[0041] The preparation steps of the purifier are as follows: first, nano titanium dioxide, fly ash, humic acid and citric acid are mixed to form a mixed system, then water is added according to the mass of the mixed system and stirred evenly, and finally clay is added, and the purifier is obtained after calcining at 250° C. for 8 hours.

[0042] After the sludge treatment is completed, the river water is pumped into the cofferdam area again and river water purifier is added. The amount of river water purifier added is 120g / m 2 ;

[0043] Step 6: River channel reinforcement construction:

[0044] First, diamond mesh is laid on the surface of the silt slope protection layer, and then dried silt (depth 30cm) is laid again, and buffalo grass is planted to consolidate the soil to form a vegetation slope protection area; finally, ecological concrete is laid in the vegetation slope protection area extending downward to the area along the river to achieve the combination of engineering protection and ecological restoration.

[0045] Determination of governance and restoration indicators:

[0046] Three months after the restoration, water quality monitoring was carried out on the treated river section (Jingkou District, Zhenjiang City); after the above treatment, the dissolved oxygen value dropped from 18.4 mg / L in the initial stage to 4.28 mg / L; the COD value dropped from 33.7 mg / L in the initial stage to 14.7 mg / L; the ammonia nitrogen concentration dropped from 2.3 mg / L in the initial stage to 0.8 mg / L; it can be seen that the water quality of the treated section has been restored to the river water quality standard stipulated by the local government, that is, Class III surface water quality in the "Surface (Surface) Water Environmental Quality Standard" GB 3838-2002, the river water body has been significantly purified, the self-purification capacity of the river water has been improved, and the ecological balance of the river and its surrounding environment has been restored.

[0047] Note: The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention; therefore, although this specification has described the present invention in detail with reference to the above embodiments, a person skilled in the art should understand that the present invention can still be modified or replaced by equivalents; and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A construction method for improving a water conservancy river management system, characterized in that: Here are the steps: Step 1: First, measure the length, width and water depth of the river channel, which are recorded as L1, W1 and H1 respectively; then detect the silt accumulation in the river channel and measure the silt depth, which is recorded as H2; Step 2: Then divide the river channel into N sections, where N is a positive integer; the length of each section is L1 / N; and cofferdam treatment is performed with L1 / N as the length, W1 as the width, and H3 as the height, where H3 is greater than (H1+H2); Step 3: After the cofferdam treatment is completed, the cofferdam area is desilted; the desilting treatment steps are as follows: first, water is pumped out, and after the water is pumped out, the sludge is stirred, and impurities and garbage in the sludge are removed; after the sludge is stirred, it is mixed with the residual river water to form a mud-water mixture; and the mud-water mixture is pumped out of the cofferdam area and stored in a sludge collection pool set up on the shore; after the mud-water mixture is pumped out of the cofferdam area, water is added to the cofferdam area again to wash the remaining sludge, and then it is pumped out again to the sludge collection pool; and the operation is repeated until the sludge in the cofferdam area is cleared; Step 4: Add sludge treatment agent into the sludge collection pool, stir evenly, and dry it to complete the sludge treatment; and dig trenches evenly on the river bank, first lay gravel at the bottom to form an anti-filtration layer, and then fill the treated and dried sludge into the trenches to form a silt soil slope protection layer. At the same time, the silt soil slope protection layer can be used as soil fertilizer to provide nutrition for the surrounding vegetation; the dosage of the sludge treatment agent is 300-500g / m 2 ; The sludge treatment agent is composed of a water-absorbing resin, calcium peroxide, diatomaceous earth, a sewage treatment agent and Bacillus subtilis powder; wherein the mass ratio of the water-absorbing resin, calcium peroxide, diatomaceous earth, the sewage treatment agent and the Bacillus subtilis powder is 3-4:2-3:2-3:3-4:0.5-1; Step 5: After the sludge is treated, the river water is pumped into the cofferdam area again and a river water purifier is added; the amount of the river water purifier added is 100-200g / m 2 ; The purifier is composed of the following substances in parts by weight: 1-2 parts of nano titanium dioxide, 6-8 parts of fly ash, 2-4 parts of humic acid, 0.5-2 parts of citric acid, and 1-3 parts of clay; Step 6: River channel reinforcement construction: First, diamond mesh is laid on the surface of the silt slope protection layer, and then dried silt is laid again, and herbaceous plants are planted to consolidate the soil to form a vegetation slope protection area; finally, ecological concrete is laid in the vegetation slope protection area extending downward to the area along the river to achieve the combination of engineering protection and ecological restoration.

2. A construction method for improving a water conservancy river management system according to claim 1, characterized in that: In step 3, the mud-water mixture is pumped out of the cofferdam area and the mud-water mixture is transported to the sludge collection pool on the shore through the mud pipeline using a pump.

3. A construction method for improving a water conservancy river management system according to claim 1, characterized in that: The impurities and garbage described in step 3 include stones and domestic garbage.

4. A construction method for improving a water conservancy and river management system according to claim 1, characterized in that: The number of repetitions in step 3 is 2-4 times.

5. A construction method for improving a water conservancy and river management system according to claim 1, characterized in that: In step 4, the depth of the gully is 1 to 1.5 m and the width is 0.8 to 1 m.

6. A construction method for improving a water conservancy and river management system according to claim 1, characterized in that: The water-absorbing resin in step 4 includes sodium carboxymethyl cellulose and polyacrylamide.

7. A construction method for improving a water conservancy river management system according to claim 1, characterized in that: The sewage treatment agent in step 4 includes cationic polyacrylamide and anionic polyacrylamide.

8. A construction method for improving a water conservancy and river management system according to claim 1, characterized in that: The preparation steps of the purifier in step 5 are as follows: first, nano titanium dioxide, fly ash, humic acid and citric acid are mixed to form a mixed system, then water is added and stirred evenly, and then clay is added, and after calcination, the purifier is obtained.

9. A construction method for improving a water conservancy river management system according to claim 8, characterized in that: The mass ratio of the mixed system to water is 1:0.5-1.5; the calcination temperature is 200-300°C, the time is 6-12h, and the heating rate is 3-5°C / min.

10. A construction method for improving a water conservancy river management system according to claim 1, characterized in that: The herbaceous plants in step six are buffalo grass, Amorpha fruticosa, red fescue or small bran grass.