Comprehensive biological treatment method of heavy metals in sewage by using chlorella

Abstract

The invention relates to the field of sewage treatment, and especially relates to a comprehensive biological treatment method of heavy metals in sewage by using chlorella. The comprehensive biological treatment method of the heavy metals in the sewage by using the chlorella comprises the following steps of performing drifting, cultivation and propagation on chlorella; performing sinking, cultivation and propagation on hornwort; performing floating, cultivation and propagation on water hyacinth; taking the propagated chlorella, hornwort and water hyacinth as pollutant clearing plants; transplanting the pollutant clearing plants into heavy-metal-polluted water to be cleaned, such as fish ponds and the like, so as to carry out aquatic pollutant clearing plant community reconstruction in the sewage; fishing out the pollutant clearing plants, and carrying out seedling replanting until the sewage is harmless, wherein the pollutant clearing plants are fished out at an appropriate time when harmful heavy metal substances accumulate in the pollutant clearing plants and corresponding harmless treatments are performed so as to prevent the pollutant clearing plants from becoming a route for secondary pollution; carrying out seedling replanting right after fishing of the pollutant clearing plants so as to enter the next pollutant clearing cycle; and then, repeating the steps. The comprehensive biological treatment method of the heavy metals in the sewage by using the chlorella has the following beneficial effects: a comprehensive biological sewage treatment technology is adopted in combination with utilization of the artificially reconstructed aquatic pollutant clearing plant communities as a core so as to treat the sewage and clear away heavy metals until water quality is purified; and the comprehensive biological treatment method has significant effects.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a method for biological comprehensive treatment of heavy metals in chlorella sewage. Background technique [0002] The ecological status of water bodies is closely related to human economic activities. [0003] According to data, research on heavy metal pollution in water has been carried out internationally since the 1960s, and research in this area in my country began in the 1980s. [0004] The survey results of major lakes in my country show that in recent years, various heavy metal pollution has been on the rise and has begun to affect the quality of water bodies. [0005] In recent years, harmful heavy metals have caused prominent environmental pollution problems. Among them, the harm caused by heavy metal pollution such as mercury and cadmium has caused huge social problems. [0006] Some experts pointed out that most of the current purification treatment of production wa...

AI Technical Summary

Problems solved by technology

[0009] Although the treatment of heavy metal polluted water by physical and chemical methods has high efficiency, there are disadvantages such as high treatment costs. Practice has proved that sewage biological purification is an effective, cheap and simple method.

[0010] Heavy metal pollutants are quite stable and refractory in water bodies, making them difficult to treat

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