Ecological restoration method for city watercourse

Abstract

The invention relates to an ecological restoration method for a city watercourse. The ecological restoration method for the city watercourse is characterized in that the polluted city watercourse is comprehensively restored with the combination of physical, biological and ecological technologies, the ecological theory is used for reference in the treatment process, the ecological idea is used as the guiding thought, a complex water ecosystem structure is constructed and restored, the original natural state of the watercourse is restored, the self-cleaning capacity of a river system is improved, the environment is beautified, and the local city microclimates are improved at the same time. The ecological restoration method mainly comprises the steps of (1) controlling a pollution source, (2) modifying the river bank, (3) optimizing the environment of the river bottom, (4) modifying the watercourse, (5) conducting aeration and oxygenation, (6) constructing an aquatic plant community, (7) constructing a fish and macrobenthos community, and (8) maintaining the system. The watercourse ecological system restored through the ecological restoration method has the certain anti-interference capacity, on the premise that a large amount of exogenous pollution is cut off, the certain-strength interference can be resisted, and the good ecological environmental effect is obtained. After one-time input, the better ecological benefit can be obtained only with a small number of maintenance costs.

Description

technical field [0001] The invention relates to the field of river restoration, especially the field of ecological restoration of urban rivers, and in particular to a comprehensive technology for controlling the physics, biology and ecology of urban rivers. Background technique [0002] A large number of pollutants in the watershed are directly discharged into the river without treatment, causing serious pollution to the water body. Especially in cities, in order to meet the needs of flood discharge, river reconstruction is only considered from an engineering point of view, the river is cut and straightened, and the three sides of the river are solidified with cement and steel. The living environment of organisms disappears, and their ecological functions and net capacity also degrade, which directly leads to the disappearance of a large number of organisms in the river, and the high-load pollution discharge easily causes the ecological system inside the river to collapse. ...

AI Technical Summary

Problems solved by technology

At present, the traditional urban river treatment at home and abroad mainly adopts physical, chemical and biological means, artificial aeration, dredging, building overflow dams, changing water, diverting water to wash away silt, mechanical algae removal and other physical means and chemical algae killing, adding iron salts Promote phosphorus precipitation, lime denitrification and other chemical methods. Although these methods are effective, they only treat the symptoms but not the root cause. After a period of time, the effect will become worse and consume a lot of manpower and financial resources.

And chemical methods are easy to cause secondary pollution to the environment, so it is not suitable to use

Biological methods, such as adding microorganisms and bacteria, planting emergent plants, etc., are relatively healthy, but the structure of the constructed system is simple, the ability to resist external interference is weak, and the effect is very limited under the action of external interference.

The main reason is that the concept of ecology is rarely taken into consideration, so it is difficult to be effective for a long time