Method for treating polluted water body by using water hyacinths

Abstract

The invention relates to a method for treating a polluted water body by using water hyacinths. In the method, the water hyacinths, the plant area of which accounts for 5%-40% of water body area, are planted in the polluted water body; a water pump is arranged in a water hyacinth planting area, the water purified by the water hyacinths is discharged to other water areas through a delivery system, and other polluted water circularly inflows in the water hyacinth planting area; a barrage is arranged at a water inlet of the water pump to intercept the water hyacinths, strong aeration systems are arranged in the barrage, at a water outlet of the delivery system and in the delivery system; the bottom of the water body in the water hyacinth planting area is provided with a mild aeration system so as to improve dissolved oxygen in the water body; fishes and snails-mussels are stocked in the water hyacinth planting area; surplus water hyacinths are removed so as to be recycled; a water inlet of the delivery system is arranged in the water hyacinth planting area or shoreside, and a water outlet of the delivery system is arranged in other areas of the polluted water body; and the delivery system is a pipeline arranged in the water body along a circulation direction of the water body or a channel arranged at the periphery of the water body. The water quality of the water body purified by the method is improved, the outburst of blue-green algae can be inhibited, and secondary pollution is not generated.

Description

technical field [0001] The invention relates to a method for using water hyacinth in situ to ecologically restore polluted water, and belongs to the fields of sewage treatment and environmental protection. Background technique [0002] The chemical oxygen demand (COD), suspended solids (SS), nitrogen, phosphorus and heavy metals in polluted water often seriously exceed the standard, which has a serious impact on the water ecosystem, thereby limiting the use of water. In still water areas such as lake bays and river bays, it is easy to accumulate and break out blue-green algae, which will cause devastating damage to aquatic ecosystems. At present, there are mainly physical methods, chemical methods and biological methods for the comprehensive treatment of polluted water bodies, or the comprehensive use of the three types of methods. The ecological restoration and management of polluted rivers and lakes, large reservoirs, ponds and other large water bodies is fundamental. ...

AI Technical Summary

Problems solved by technology

Utilize water hyacinth (water hyacinth) to control eutrophic water body (application number: 01108743, 200310117541, 200710029516), at present there are only static treatment of simple planting, salvage and treatment of water hyacinth, which can only limit the scope of water hyacinth governance Planting water hyacinth in a small area of ​​the water body for a long time will seriously inhibit the growth of algae due to the competition of nutrients and light, and the dissolved oxygen in the water body mainly comes from the photosynthesis of algae, which will easily lead to the lack of algae in the water body. Oxygen is easy to bring a devastating blow to aquatic organisms such as fish in the water, thus causing secondary pollution of a worse nature. Most of the domestic reports of water hyacinth disasters in summer stem from this

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