Biological remediation method of eutrophic water body

Abstract

The invention provides a biological remediation method of a eutrophic water body. The method comprises the following steps: (1) when the lowest average daily air temperature is 0-10 DEG C, placing canna indica seedling floating beds into the water body until the coverage rate is 30-50%, and recovering the canna indica seedling floating beds at a same time of the next year or before a freezing period in the current year; (2) spreading hydrilla verticillata vegetative mass according to a throwing density of 100-130 g / m<2>, and replacing the hydrilla verticillata vegetative mass at a same time ofthe next year; and (3) when the lowest average daily air temperature is 10 DEG C or above, respectively controlling the density of anodonta woodiana and the density of bellamya aeruginosa to be 3-6 / m<2> and 30-40 / m<2>, carrying out density detection every 2-3 months, and throwing or fishing the anodonta woodiana and the bellamya aeruginosa at a proper time. The total nitrogen of an applicable water body is 0.2-1.5 mg / L, the total phosphorus is 0.02-0.3 mg / L, the ammonia nitrogen is 0.15-1.5 mg / L, and the chemical oxygen demand (COD) is 4.0-10.0 mg / L. According to the method, the defects ofhigh price, complex operation and the like in treating a water body by using a large amount of large-scale fishes and several simulation technologies in a conventional biology operation technology areeliminated. According to the method disclosed by the invention, cost can be saved, the economic benefit is superior to the economic benefit of other similar water treatment methods, later-period management is simple and convenient, and the method is suitable for industrial popularization and application.

Description

technical field [0001] The invention belongs to the field of sewage treatment and relates to a bioremediation method for eutrophic water bodies. Background technique [0002] With the development of social economy and the gradual improvement of people's living standards, people's requirements for water quality are also getting higher and higher. Compared with the water body of the river, the water body of the reservoir is basically in a static state. In the season with high temperature, the water supply plant intermittently operates under eutrophic conditions, resulting in poor water quality. [0003] So far, for the treatment of organic water with high algae, some patents have introduced a more comprehensive treatment method: by adding rice shrimp, zooplankton, phytoplankton, large carnivorous fish, molluscs and planting aquatic vegetation to the water body, Increase biodiversity and biological chain complexity to achieve effective treatment of high algae water (CN 1055408...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of low economic efficiency, complex process and cumbersome operation of current bioremediation water technology, the present invention provides a method for treating eutrophic water by using aquatic benthic animals combined with aquatic plants, which is simple to operate and relatively economical

Images