Method for flocculating and removing blue algae through dual-polymer composition and application of dual-polymer composition

Abstract

The invention discloses a method for flocculating and removing blue algae through a dual-polymer composition. The dual-polymer composition is prepared from a natural cationic polymer A and a natural anionic polymer B; the polymer A is a mixture formed by one or two of chitosan and chitin according to a mass ratio of (1 : 200) to (100 : 1); the polymer B is a mixture formed by one or two of xanthan gum and pullulan according to a mass ratio of (1 : 500) to (300 : 1). The method for flocculating and removing the algae through the dual-polymer composition is characterized by comprising the following steps: firstly adding the polymer A into blue algae water according to a final concentration ratio of 0.2mg/L to 10mg/L, uniformly mixing, then adding the polymer B into the blue algae water according to a final concentration ratio of 0.2mg/L to 30mg/L, the adding ratio range of the polymer A and the polymer B being (1 : 1) to (1 : 3), adjusting pH of the algae water to be 3-7, stirring for 0.5-5 minutes under 100-500 rpm, standing or stirring for 0.5-10 minutes at a low speed to form massive dense blue algae floccules, and removing the algae floccules via a filtering or fishing manner.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a method for flocculating and removing cyanobacteria in water by using a double polymer composition and an application thereof. Background technique [0002] Eutrophication is a phenomenon of water pollution caused by excessive plant nutrients such as nitrogen and phosphorus. One of the prominent problems it brings is the outbreak of blue-green algae. The outbreak of harmful cyanobacteria not only destroys the balance of the ecological composition of the water body, reduces the efficiency of water resource utilization, but also produces harmful microcystins and volatile odor metabolites in the process of growth and metabolism, and brings public safety and health risks. Great hidden danger. [0003] In recent years, scholars at home and abroad have developed a variety of cyanobacteria emergency treatment technologies, which can be divided into physic...

AI Technical Summary

Problems solved by technology

Common physical methods include mechanical salvage method, filtration method, aeration method, air flotation method, water replacement method, etc. Although these methods are effective and non-polluting, they have a large workload, long cycle, high cost of algae control, and can only cure the symptoms but not the root cause.

Chemical algae removal methods include chemical algae killing method, chemical coagulation and sedimentation method, etc. These methods have quick results and high efficiency, but the duration of action is short, and secondary pollution is easily generated

Common biological methods include microbial algae control method, plant algae suppression method, aquatic animal manipulation method, etc. Although these methods are not easy to produce secondary pollution, but the operation cycle is long, and the operation is easily affected by external conditions, making it difficult to control

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