Method for ecologically restoring river channel by taking reclaimed water as main water source

Abstract

The invention discloses a method for ecologically restoring a river channel by taking reclaimed water as a main water source. The method comprises the following steps: laying sewage interception pipes along both sides of the river channel to intercept sewage entering the river channel, and delivering the sewage to an urban sewage treatment plant all at once through an urban blow-off line; shutting down and removing direct-discharge pollution sources at both sides of the river channel, building landscape roads at both sides of the river channel, and setting a green isolation belt between each landscape road and the river channel; strictly supervising the running state of the urban sewage treatment plant so as to guarantee the water quality of the discharged reclaimed water to reach the A standard of the primary standard; reserving river channel bottom mud which is 0.1-0.2m thick, and clearing excessive bottom mud; leading the reclaimed water discharged from the sewage treatment plant into the river channel, keeping the flow rate of the reclaimed water not lower than 0.1m / s, and meanwhile, keeping the depth of the reclaimed water 0.3-1.5m. After the polluted river channel is governed by adopting the method disclosed by the invention, the variety of submerged plants in the river channel is not smaller than three, and the good restoration of the ecological system of the river channel is realized.

Description

technical field [0001] The invention belongs to the technical field of ecological restoration, and in particular relates to a river ecological restoration method using recycled water as the main water source. Background technique [0002] With the rapid development of the city, in order to meet the needs of the rapid expansion of the city, for urban water use, the strategy of cleaning up the sewage without diversion and using the river as a sewage ditch is generally adopted, resulting in urban rivers generally becoming sewage ditch, and organic pollutants in the river. As the content rises, the dissolved oxygen decreases, and even in a state of hypoxia for a long time, the submerged plants cannot respire, which eventually leads to the demise of the submerged plants. As the main body of the river ecosystem, once the submerged plants disappear, the river ecosystem will collapse. With the increasing pressure on the water environment and the improvement of economic capacity, imp...

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Problems solved by technology

Since the ecological restoration of urban rivers involves a series of issues such as pollution control, drainage system reconstruction, and comprehensive river improvement, which are related to the vital interests of thousands of households, it is extremely difficult to implement. For this reason, it is still in the process of exploration in many cities. practice stage

[0004] Submerged plants are the core of the river ecosystem, and the restoration of submerged plants is the key to ecological restoration of the river. At present, the following three methods are mainly used for the ecological restoration of the river: (1) Bio-augmented artificial river: combined with the dredging project and the current structure of the water system, the constructed For artificial rivers with biological treatment as the main body, the main body of water purification facilities is located in the river or on one side of the river to form a multi-stage series biological purification system, thereby improving the water environment conditions; Pollutants can play a high role in purification, but it cannot guarantee the good recovery of submerged plants

(2) Set up a natural river ecological pond: use solar energy as the initial energy, plant aquatic plants in the pond, carry out aquatic products and waterfowl breeding, and form an artificial ecosystem; through the material migration and transformation of multiple food chains and the step-by-step transfer and transformation of energy , to purify organic pollutants in river water; this method uses the principle of biological ponds to purify pollutants, and its foothold is also to reduce the degree of river pollution. For heavily polluted rivers, the recovery of submerged plants cannot be guaranteed.

(3) Set up ecological ditches: according to the pollution tolerance and physiological characteristics of aquatic plants. Make full use of the existing canal conditions, choose measures such as inter-gravel contact oxidation and enhanced biological contact oxidation in different canal sections to purify the water quality step by step, and integrate the purification facilities with the surface landscape while achieving the function of graded water purification. Beautify the river landscape; this method also has a good water purification effect for rivers with large hydraulic gradients (more than 0.5%) and shallow water flows (less than 0.1 meters), but its main goal is not to restore submerged plants. In this environment, Water depth cannot guarantee the normal growth of submerged plants

In summary, none of the above three methods can restore river submerged plants and restore the damaged river ecosystem.

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