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
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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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