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 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. The bubble formation and collapse is what sets in motion a range of natural chemical effects (part of which is the production of additional small quantities of Hydrogen Peroxide), and the main reason we can reduce those hard-to-eliminate species like Microcystis and Biofilm.
A recent project by the Australian Water Research Council found that ultrasound at the right power/duration balance can control cyanobacteria 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. 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.
Independent environmental analysis of water in the Stratford Power Station in New Zealand shows a massive reduction from 12,300 cyanobacteria cells per ml before installation of the Envirosonic units in December 2011, to just 134 cells per ml after installation – a 98.9% reduction (see case study for full details and copies of analysis). There has not been a single cyanobacteria bloom experienced since that time.
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.