Cynobacteria Report Indecisive on Circulators

Cyanobacterial Harmful Algal Blooms: State of the Science and Research Needs by H. Kenneth Hudnell is a 950 page reference which represents a holistic assessment of the state of the science identifying research needed to address the increasing risks posed by freshwater harmful algal bloom to human health and ecosystem sustainability.  The book contains an overview of the Interagency, International Symposium on Cyanobacterial Harmful Algal Blooms. The symposium contained a section on watershed management techniques designed to reduce Cyanobacterial Harmful Algal Blooms (CHABs) which discussed the use of water circulation systems such as SolarBees.  The report indicated that “research is needed to further assess the effectiveness of bubble and pump vertical mixing systems at controlling CHABs, and to identify the mode(s) of action by which vertical mixing inhibits CHABs.”

Excerpt from report:


“Watershed management techniques provide a long-term strategy for reducing CHAB incidence and improving water quality.  The implementation of water management plans may provide near-term improvements that prevent or terminate CHABs.  Increased flow rates and decrease water temperatures improve water quality and reduce the probability of a CHAB occurrence.  Where as flow rate and water temperature control are impractical for many surface waters, evidence indicates that artificial destratification of the water column may be highly efficient means of prevent and terminating CHABs.  The use of bubble systems to vertically mix the water column may be effective on a small scale if the density of bubblers is sufficient, but up scaling to large areas is usually impractical.  Alternatively, floating solar powered platform can host pumps that draw in water from above the benthos (to avoid nutrient resuspension from sediment) but below levels at which CHABs occur. The water is discharged at the surface, creating a vertical mixing loop over areas as large as 35 acres.  Research is needed to further assess the effectiveness of bubble and pump vertical mixing systems at controlling CHABs, and to identify the mode(s) of action by which vertical mixing inhibits CHABs.  Vertical mixing may inhibit CHABs by disrupting cyanobacteria’s ability to regulate it position in the water column, or by inducing the dispersion and amplification of microbial colonies that effectively prey upon or infect cyanobacteria. Additional research may reveal other methods by which the competitive forces against cynobacteria can be increased.”

Source: Cyanobacterial Harmful Algal Blooms: State of the Science and Research Needs

By H. Kenneth Hudnell Page 33 (emphasis added)

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Filed under Scientific Study, Solarbees

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