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A treatment system for lake mouth pre-reservoir characterized by arc-shaped ecological diversion dam

A treatment system and a diversion dam technology, applied in the field of diversion dams, can solve the problems of harsh installation conditions of natural energy drive devices, aggravating the degree of eutrophication of lakes, and single function of diversion dams, and achieve good physical adsorption and surface. Chemical activity, reducing the cross section of the river channel, increasing the effect of dissolved oxygen in the water body

Active Publication Date: 2016-06-15
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] There has been no good solution for the treatment of pollutants in the lake mouth area. Direct discharge into the lake will not only increase the degree of eutrophication of the lake, but also increase the difficulty of treatment. At the same time, the existing diversion dam has a single function and cannot The water quality has a purification effect, and it is relatively difficult to enter the water body in the pre-reservoir area. The natural energy drive device has disadvantages such as harsh installation conditions, limited water intake, and relatively high cost. The invention provides an arc-shaped ecological diversion dam. Hukou pre-reservoir treatment system to reduce the degree of eutrophication of the water body and realize the solution to the above problems

Method used

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  • A treatment system for lake mouth pre-reservoir characterized by arc-shaped ecological diversion dam
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Embodiment 1

[0026] A lake mouth pre-storage treatment system characterized by arc-shaped ecological diversion dams was constructed in a lake mouth area in southern Jiangsu. A large amount of nutrients such as N and P entering the lake in Hukou District is one of the main reasons for the eutrophication of the lake. The present invention utilizes an arc-shaped ecological diversion dam to divert the water entering the lake to the front reservoir system, and the design hydraulic load is 0.20m 3 / m 2 / d (cubic meter / square meter / day), the water surface area of ​​the front reservoir is 12000m 2 , volume is 14000m 3 , water inflow is 4000m 3 / d, the hydraulic retention time is 5d. The periphery of the pre-reservoir is mainly composed of soil structures, and the various areas are connected to each other. The shape is approximately rectangular. figure 1 As shown in Fig. 1, the treatment system of the front reservoir at the mouth of the lake, which is characterized by an arc-shaped ecological ...

Embodiment 2

[0035] An arc-shaped ecological diversion dam pre-storage project was built at the mouth of a certain lake. The arc-shaped ecological diversion dam was used to divert the influent water to the front-storage system to improve the sewage treatment efficiency of the original front-storage system. The design hydraulic load is 0.40m 3 / m 2 / d, the water surface area of ​​the front reservoir is 16000m 2 , volume is 20000m 3 , water inflow is 7000m 3 / d, the hydraulic retention time is 4d.

[0036] Arc-shaped ecological diversion dam: The arc-shaped ecological diversion dam is located in the Hukou area, one end is connected to the river bank, and the other end extends to the river channel in an arc shape. The arc is 40° and the length is 1 / 2 of the river width. The height is consistent with the normal water level of the lake. The dam body structure adopts a trapezoidal cross-section, with a facing slope of 3:1 and a back slope of 1:1.5. The dam crest is flat and 6m wide. The soi...

Embodiment 3

[0040] Other parameters are as embodiment 1, and difference is that described arc ecological diversion dam, its radian is 35 °, and its length is about 1 / 3 of river channel width; The slope of the slope is 1:2; the system area is 10000m 2 , the ecological interception area, with an area of ​​3000m 2 ; The enhanced purification zone has an area of ​​4000m 2 The area of ​​the ecological stability zone is 3000m 2 .

[0041] After purification by the arc-shaped ecological diversion dam project, the main conventional water quality indicators have been improved, as shown in the table below.

[0042] water quality index

[0043] Incoming water concentration / mg.L -1

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Abstract

The invention discloses a lake-port pre-reservoir treating system taking an arc-shaped ecological diversion dike as a characteristic. The lake-port pre-reservoir treating system comprises an arc-shaped ecological diversion dike, an ecological intercepting area, a strengthened purifying area and an ecological stable area, wherein after being diverted by the arc-shaped ecological diversion dike, inflowing water firstly passes through the ecological intercepting area, then enters the strengthened purifying area and finally reaches the ecological stable area; the arc-shaped ecological diversion dike is arranged at an intersection of a T-shaped lake port, one end of the arc-shaped ecological diversion dike is connected with a river band and the other end of the arc-shaped ecological diversion dike extends into a river slot in an arc-shaped manner; the arc-shaped ecological diversion dike and the pre-reservoir system are organically combined, so that power needed by inflowing in a reservoir area is solved, the treating efficiency is improved, and a purpose of reducing lake pollutants is finally achieved. A purpose of removing 37.8% of COD (Chemical Oxygen Demand), 30%-40% of TN (Total Nitrogen) and TP (Total Protein) and 50% of SS (Sulfur) can be realized after the treating system is adopted, and the quality indexes of most of treated water are superior to National Environmental Quality Standards IV for Surface Water.

Description

technical field [0001] The invention relates to a diversion dam, in particular to a lake mouth pre-storage processing system characterized by an arc-shaped ecological diversion dam, which is applied to the pre-storage processing system. Background technique [0002] With the rapid development of economy, the rapid growth of population and the acceleration of industrialization and urbanization, the discharge of nitrogen and phosphorus nutrients to water bodies is increasing, and the degree of eutrophication of lakes is intensified. When polluted water bodies flow into large areas of water, It will be more difficult to control eutrophication, so it is very necessary to install sewage treatment system at the estuary of the lake. [0003] The diversion dam is a common type of river channel improvement structure, which is a building connected to the river bank at one end and extending to the river channel at the other end. The existing diversion dam is mainly to change the veloc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B3/00E02B3/02E02B3/06C02F3/32
CPCY02A10/30Y02W10/10Y02W10/33Y02W10/37
Inventor 张毅敏杨飞汪龙眠吴晗高月香晁建颖
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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