Method for synergistically treating cyanobacterial bloom through black film, disturbance and iron element

Abstract

The invention discloses a method for synergistically treating cyanobacterial bloom through a black film, disturbance and an iron element, and belongs to the field of ecological restoration of water bodies. The method comprises the following steps of covering a black film on the water surface on which cyanobacterial bloom is formed, performing disturbing for a plurality of days in combination witha water body, and splashing FeCl3.6H2O with a certain concentration, wherein the black film, the disturbance and the iron element can form a synergistic effect, cyanobacteria are remarkably killed, the number of the cyanobacteria is reduced, the removal rate of the cyanobacteria can reach 95% or above, and the density range of cyanobacterial bloom is 0.1*10<8> to 40*10 <8> cells / L. The method is safe, simple, low in cost, good in effect and free of secondary pollution. The method can be used for treating cyanobacterial bloom in fresh water bodies such as lakes, reservoirs, rivers and ponds.

Description

technical field [0001] The invention relates to a method for synergistically treating cyanobacteria blooms with black film, disturbance and iron elements, and belongs to the field of ecological restoration of water bodies. Background technique [0002] With the rapid development of my country's economy, a large number of pollutants are produced and discharged, resulting in the increasingly serious eutrophication of many lakes and reservoirs. Due to eutrophication, cyanobacteria blooms broke out in many lakes, reservoirs and rivers, causing significant impact and loss on people's social life and production. How to prevent and control blue-green algae blooms has become a focus of attention of the government and the people. [0003] So far, the methods for preventing and controlling cyanobacterial blooms mainly include physical, chemical and biological methods. Among them, physical methods include salvage method (mechanical salvage and manual salvage), flocculation sedimentat...

AI Technical Summary

Problems solved by technology

Among them, physical methods include salvage method (mechanical salvage and manual salvage), flocculation sedimentation method, water exchange method, high-pressure algicidal method, ultraviolet algicidal method and ultrasonic algicidal method. Traditional physical methods consume a lot of manpower, material resources and financial resources. , and treat the symptoms but not the root cause; chemical methods include chemical algicidal methods and oxidant algicidal methods. Chemical agents have high algicidal efficiency, but they bring secondary pollution problems, such as copper sulfate, oxidants used in oxidant algicidal methods or peroxidation Hydrogen, and the effect on high-concentration wild cyanobacteria is not good; biological methods include microbial methods, plant allelopathic methods, zooplankton feeding methods, benthic animal feeding methods, and fish feeding methods. However, biological methods generally have a long cycle and are affected by the environment. Factors have a relatively large impact and are uncontrollable

[0004] Therefore, the invention patent with the Chinese patent announcement number CN 105129951 B discloses a preparation method of a modified algae flocculant and its application in controlling cyanobacteria blooms. By adopting the method of chemical complexation and physical adsorption, ferric nitrate Fixed to the negative acrylamide to prepare the modified flocculant, which greatly improves the flocculation effect of Microcystis, avoids the outbreak of cyanobacteria bloom, and thus effectively improves the water environment without causing secondary pollution. However, this method The steps are complicated and the cost is high. In addition, the microcystis that flocculates and sinks to the bottom of the water is easy to resuspend under the disturbance of wind and waves, which is not conducive to popularization and application; the invention patent of Chinese Patent Publication No. CN108101181A discloses a water lake suitable for urban landscape. The cyanobacteria bloom control method is to sew the mixture of diatomite and polyferric chloride into a double-layer non-woven fabric to make a flocculant belt, and then fix it on the nylon screen to form a flocculation mesh belt. After the floating balls are set at intervals on the edge, they are placed on the water surface of the lake to effectively control the cyanobacteria bloom through flocculation, and at the same time, the cyanobacteria and flocculants are completely separated from the water body through the collection of the flocculation mesh belt to avoid secondary pollution. , this method is only suitable for urban landscape water lakes, and cannot be applied to the prevention and control of cyanobacterial blooms in rivers, reservoirs or large-scale lakes

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