Preparation method of modified konjac glucomannan loaded copper sustained-release agent and its application in water bloom control

Abstract

The invention discloses a preparation method of a modified konjac glucomannan loaded copper slow release agent and application in algal bloom control. Konjac flour is adopted as a raw material to prepare loaded copper modified konjac glucomannan; with blue algae, green algae, diatom, pyrrophyta and the like as indoor experimental algae, the result indicates that the modified konjac glucomannan loaded copper realizes an obvious inhibiting effect on the growth of different algae and has a characteristic of slow release controlling on algae growth. The loaded copper slow release agent has an obvious control effect on algal bloom of the blue algae, the green algae, the diatom and the pyrrophyta in a natural water body; field experiments prove that the loaded copper slow release agent can prevent outbreak of algal bloom within 1-3 years. By adding 0.5-1.0g / L of the loaded copper modified konjac glucomannan into the water body, the Cu<2+> is lower than the standard limit in the Standards forDrinking Water Quality and the Cu<2+> content of class-III water quality in the Environmental Quality Standards for Surface Water. The slow release algae control agent has the advantages of high efficiency and quickness of copper sulfate; the slow release ability also avoids the shortcoming of extremely high local concentration of copper sulfate caused by direct adding of copper sulfate, and is also natural and nontoxic and biodegradable, and thus is a natural, safe and efficient algae control agent with a broad application prospect.

Description

technical field [0001] The invention provides a copper-loaded modified konjac glucomannan slow-release agent and its application in controlling the outbreak of algal blooms. Background technique [0002] With the rapid development of industrial and agricultural production and the expansion of urban scale, a large amount of industrial wastewater, domestic sewage and farmland surface runoff are discharged into the lake water body, which intensifies the eutrophication of the lake. During the eutrophication process of lakes, algae (especially blue-green algae) multiply to form algal blooms. The formation of cyanobacterial blooms, on the one hand, leads to the decrease of water transparency, the decrease of dissolved oxygen, and the increase of suspended solids and COD; on the other hand, it produces and secretes a large number of secondary metabolites, such as toxins and odor compounds. These secondary metabolites can not only affect the quality of drinking water and aquatic pr...

AI Technical Summary

Problems solved by technology

At present, the most widely used chemical algae killing method is to put copper sulfate directly into the water body, but it is easy to cause the local concentration of copper sulfate to be too high, thereby endangering other aquatic organisms in the water, and long-term use will also cause secondary pollution of the water body

In addition, the copper ions formed after copper sulfate enters the water body will be quickly converted into copper carbonate (CuCO 3 , K ap =1.4×10 -10 ) and copper hydroxide (Cu(OH) 2 , K ap =2.2×10 -20 ) and precipitate, reducing the efficiency of the algaecide

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