Method for removing water algae by utilizing ultrasonic fortified flocculation

Abstract

The invention relates to a method of removing algae in water body by using low-intensity supersonic to intensify the coagulating course, belonging to water treating application field. The method intensifies the coagulating course by using low-intensity supersonic to improve coagulating effect, and removes algae in water without breaking the algae cell, first, damaging the air-pocket and photosynthetical system in the algae cell by using supersonic, to make the algae cell already flocculated and deposited will not flost and grow further; second, reducing the hydration layer of the algae cell and suspended matter particle by using supersonic, reducing zeta electric potential, improving the surface flocculability, and increasing the flocculability efficiency. Third, fastening the dispersion of flocculability agent by using supersonic, stimulating the reaction of flocculating agent with algae cell and floating particle and increasing the coagulating velocity. The refloating and further growing of algae already coagulated can be prevented by using this method, the flocculating agent consumption can be reduced, the degree of density of the flocculating product can be increased and the coagulating clearance can be improved.

Description

technical field [0001] The invention relates to a method for removing algae in a water body by using ultrasonic enhanced coagulation, and belongs to the field of water treatment applications. The method uses low-intensity ultrasound to strengthen the coagulation process, improve the coagulation effect, remove algae in the water body without breaking the algae cells, so that the algae will no longer be suspended in the post-coagulation treatment process and continue to grow, and can reduce flocculant dosage. Increase the amount to increase the density of flocs and improve the coagulation removal rate. technical background [0002] Blue-green algae, which widely exist in eutrophic natural surface waters, are prokaryotic organisms capable of photosynthesis. They contain chlorophyll a and have a specific gravity of about 1. They mostly grow in suspension in water bodies and tend to grow rapidly under suitable conditions. form algal blooms or red tides. [0003] The blooms form...

AI Technical Summary

Problems solved by technology

[0009] 1. Flocculation only temporarily destabilizes and condenses algae in water to make them easy to separate, but the activity of algae cells is not reduced, the thylakoids in algae cells are not damaged, and the photosynthetic system is still intact, so they are often used in subsequent treatment processes will continue to grow and enter the water being purified, causing scum in sedimentation tanks and by-products during chlorine disinfection

[0010] 2. When the concentration of algae is high, the effect of coagulation to remove algae is poor, and a higher dosage is required

[0012] Although there have been reports that ultrasound can inhibit the growth of algae and that ultrasound can promote the coagulation of hydrophilic colloids, the reports of ultrasound-enhanced flocculation to remove algae are relatively rare.