Inactivation of Cyanobacteria by Underwater Shock Wave

Abstract

A treatment of underwater shock wave was proposed to solve this problems which the harm caused by cyanobacteria blooms. Underwater shock wave technology has the features of energy saving, environmental protection, safe and efficient. The underwater shock wave technology effective performance for the removal of cyanobacteria was investigated. The results obtained from on-site algae water showed that the initial chlorophyll-a content of Taihu Lake wild algae is 216.22 μg/L, after applying with the optimum working conditions treatment, the chlorophyll-a of the treated group is only 3.84μg/L at the ninth day, while the concentration of chlorophyll-a was 209.87μg/L in control group after 9 days of culture, the average removal rate was 98.22%. The initial algal toxin level in the wild algae in Taihu Lake was 4.23 μg/L, after treatment with underwater shock wave, the concentration of algae toxin in the treatment group decrease below the limit of detection (0.1 μg/L) after 1 day of algae culture, meanwhile, the control group increased to 4.36 μg/L. The contents of TN, TP and COD in the treatment group were lower than the control group with the underwater shock wave treatment. The results indicated that the underwater shock wave cannot only inactivated the wild cyanobacteria, but also can improve water quality.