Blue green algae reproduces at a variable rate but in favourable conditions, a 20% to 25% growth rate per day is not uncommon – this is equivalent to a doubling rate in cell numbers over 3 to 4 days, with consequent rapid deterioration of water quality. In some areas, growth rates of up to 160% a day have been recorded – more than doubling in a day!
The use of ultrasound as an alternative toxic blue green algae treatment to chemicals has been the subject of research since the 1970s. The diagram above shows the production of high pressure bubbles and their collapse, via ultrasound.
This cavitation effect is what also sets in motion a range of natural sono chemical reactions (including the productions of small quantities of radical hydroxyl and hydrogen peroxide). These combined effects reduce hard to eliminate algae like Mycrocystis throughout the water column – algae can grow to a depth of over seven metres.
A recent project by the Australian Water Research Council found that ultrasound at the right power/duration balance can control cyanobacteria (blue green algae) in a way that is highly effective, economically viable and environmentally friendly. The Research Council is now turning to practical field research, noting that new companies’ research on the optimal frequency and time parameters are ‘trade secrets’. Click here to view the AWRC’s Fact Sheet on Ultrasound.
Over the past 12 years extensive research by the International EnviroSonic Group, both here in Australia and world wide, has led to the development of new, state-of-the-art third generation ultrasound systems for the treatment of toxic blue green algae. We continue to be recognised for our success in providing truly world class, effective, environmentally friendly and chemical free solutions to the world’s cyanobacterial, algae and biofilm problems.
Our EnviroSonic units have demonstrated success in field applications, and benefit from integrations with solar panel systems, and wireless and mobile phone technology for on-shore and remote monitoring.