Comparison of advantages and disadvantages between chemical algicide and biological algicide

At present, the control methods of cyanobacteria are mainly divided into two categories, namely, chemical algicide and biological algicide, in which biological algicide is divided into bacteria and algicide.

Chemical algae killing:

Chemical algicide, also known as drug algicide, is a traditional method to treat algae. The principle is to sprinkle specific drugs on the water body, and the specific ingredients in the drugs act on algae cells, so that the algae cells lose activity and die. Commonly used algicidal drugs include copper sulfate, copper complex, bleaching powder, chlorine dioxide and so on.

Advantages and disadvantages of chemical algal killing analysis advantages: algal killing speed, complete. It clears the water quickly and the cyanobacteria bloom disappears.

Disadvantages or harms: a, no selectivity, blue algae beneficial algae kill together; B. After algal killing, water quality is more deteriorated than that of cyanobacteria due to lack of algae; C, easy to cause hypoxia of fish and shrimp. On the one hand, algae death and decomposition need to consume a large amount of dissolved oxygen, and the water body loses an important source of dissolved oxygen for photosynthesis due to lack of algae. D, reduce the circulation and energy flow of water. E, can not fundamentally cure cyanobacteria, drug disappeared, cyanobacteria recurrence.

Biological inhibition of algae:

A, bacteriostatic algae: bacteriostatic algae is to the cyanobacteria water body with strong activity of artificial cultivation of bacteria, let the bacteria in the water in large numbers, by competing with cyanobacteria (cyanobacteria) nutrition and space environment, or secreting bacteriostatic (algae) substances and other means, so as to inhibit the growth and reproduction of cyanobacteria. The bacteriological agents used to inhibit algae are mainly bacillus.

The advantage of bacteriostasis is that the decomposition and transformation of organic and inorganic harmful compounds in water is also carried out when the fungi prolificate in large numbers, that is, water purification.

B, algae algal inhibiting: algae algal inhibiting is in the covert of the cyanobacteria water casting diatoms, algae and other single cell algae of specific nutrients, make the structure change of the nutrient elements conducive to single cell algae growth, so that the single cell algae blooms, in single cell algae growth at the same time, gradually reduce the number of cyanobacteria eventually reduced to a population cannot outbreak.