Technique and device for integrated two-stage strengthened air-flotation separation of dense algae slurry

Abstract

The invention relates to a technique for integrated two-stage strengthened air-flotation separation of dense algae slurry. The technique comprises that: collected dense algae slurry first enters a first-stage air-flotation tank where algae and high-density micro-bubbles have contact with and adhere to each other so as to separate algae and water and remove about 50 to 80 percent of algae, and then water enters a second-stage strengthening air-flotation tank, is added with an appropriate amount of flocculant, and then is subjected to air-flotation treatment again so as to remove the remaining algae and other suspended substances in the water. The invention not only applies to the disposal of dense algae slurry, but also can be used to treat algae-rich water low in algae content. The invention has the advantages of effectively removing blue-green algae in water, transferring nitrogen, phosphorus and other nutrient loads in water, purifying water, preventing the explosion of blue-green algae and providing an effective method and a device for controlling the pollution of lakes and reservoirs.

Description

Technical field: [0001] The invention relates to a method and device for removing polluted algae represented by blue-green algae in natural lakes and urban landscape water bodies, and is a method for removing high-concentration polluted algae in eutrophic water bodies. The technology of thick algae slurry, the method and device for treating the thick algae slurry (solid content between 0.5-1.5%) salvaged from eutrophic water body, belongs to the field of environmental protection engineering equipment. Background technique: [0002] China is a country with many lakes, the whole country has a total of 1Km 2 There are 2759 lakes above, with a total area of ​​91019Km 2 , accounting for 0.95% of the country's land area, about one-third of which are freshwater lakes, and most of them are shallow water lakes. Although there are many lakes in our country, the per capita water resources are scarce, and with the rapid economic development and inappropriate lake development in the pa...

AI Technical Summary

Problems solved by technology

Although there are many lakes in our country, the per capita water resources are scarce, and with the rapid economic development and inappropriate lake development in the past two decades, the ecological environment has been polluted. Most of these lakes have become eutrophic or are in the process of eutrophication. The ecological structure and function of lakes are degraded or lost, and harmful algae represented by cyanobacteria are increasingly serious in natural water bodies. threat to the safety of drinking water

In response to the continuous outbreak of blue-green algae blooms in eutrophic water bodies, local competent departments and units have also taken active actions to control blue-green algae, the most common of which is to organize large-scale manual salvage. A large amount of blue-green algae was picked up and stacked together, but this method obviously can only solve the temporary problem. Although a large amount of blue-green algae pulp was picked up, most of it was water, and the planktonic algae in natural water bodies did not decrease significantly. At the same time The concentrated stacked cyanobacteria pulp not only takes up a lot of land, but also pollutes the environment and groundwater after the death of cyanobacteria

In addition, according to research, the salvaged cyanobacteria pulp generally has a solid content of 0.5-1.5%. At this time, the appearance of the cyanobacteria pulp is a thick, sticky liquid, which is difficult to handle by general filtration or flocculation separation. low efficiency

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