Method for improving and treating water quality of rainwater collection type reservoir

Abstract

The invention relates to a method for improving and treating water quality of a rainwater collection type reservoir, which gives play to the joint advantages of multiple professions such as water conservancy, environment, ecology, agriculture, management and the like, and comprehensively considers the pollution source and nutrient salt space-time distribution characteristics of the rainwater collection type reservoir. A systematic treatment method of 'external source sewage interception-water body purification-sediment pollution control-ecological restoration-management and maintenance' is adopted, and classified directional strategy application and zoning accurate pollution control are performed on rainwater collection type reservoir water body pollution according to local conditions. Themethod comprises the following steps of (1) investigating and analyzing reservoir pollution characteristics, (2) intercepting surface source runoff around the reservoir, (3) water nutrient salt in-situ reduction, (4) bottom mud nutritive salt in-situ control, (5) restoring and reconstructing the aquatic plants, (6) optimizing and regulating the aquatic animals, and (7) operation management and maintenance after reservoir system governance. The water quality of the reservoir can be rapidly and efficiently improved, meanwhile, natural ecology is reconstructed to a certain extent, the self-purification capacity of the reservoir is improved, and good ecological landscape and long-acting maintenance of water environment quality are achieved.

Description

technical field [0001] The invention relates to a technical system and method for effectively controlling the eutrophication of lakes and reservoirs and improving the water quality of water areas, belonging to the field of lakes and reservoirs ecological management. Background technique [0002] As an important water conservancy infrastructure, reservoirs play an important role in flood control irrigation, water supply and aquaculture, tourism ecology, etc., and have made great contributions to my country's agricultural development and economic construction. However, due to the high-intensity fertilizer-water fish farming (also known as fertilizer fish farming) in the past few decades, the water quality of many small and medium-sized reservoirs has been seriously polluted. As an important type of reservoir, rainwater-collecting reservoirs have no tributaries, and their water source is mainly the confluence of natural rainfall in the reservoir basin. The eco-hydrological char...

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Problems solved by technology

(2) The temporal and spatial distribution of nutrient salts in the reservoir is significantly different. The nutrient salt concentration fluctuates between the flood season and the non-flood season. The nutrient salt concentration of the bottom water body is higher than that of the surface layer when the summer is high temperature; ; The concentration of nutrients in the bay and tail of the reservoir is low, and the concentration is mainly in granular form; the nutrient content in the sediment in front of the dam is high, and the risk of endogenous release is greater

(4) Rainwater-collecting reservoirs have a low water replacement rate, slow water renewal, poor self-purification ability, and weak self-recovery ability of the system

However, since the form and distribution characteristics of nutrients in the water body and sediment are not considered, this method uses the same treatment method for the treatment of nutrients in different areas of the reservoir, which lacks technical pertinence and may result in half the effort

The distribution of nutrients in eutrophic reservoirs, especially in rainwater-collecting reservoirs, is significantly different. The concentration and form of nutrients in the reservoir bay, reservoir tail and the water body in front of the dam are quite different. If the same treatment method is used, it will not only be difficult to achieve The efficient reduction of nutrients in the reservoir will also increase the cost of treatment

[0009] In summary, the current reservoir treatment technology has the following problems: ① Lack of comprehensive treatment and classified policy implementation technology, it is difficult to meet the treatment requirements of reservoir system pollution control and long-term maintenance of water quality ; ② The existing technology is limited to the treatment of eutrophication and algae killing of water bodies, and lacks technical solutions for sub-regional and precise treatment according to the pollution characteristics of rainwater-collecting reservoirs

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