[ECOLOG-L] Suggestions for algae flocculation

[=?ISO-8859-1?Q?Sean_McKenzie?=]

Hello,
I am working on a project to use algae cultured in wastewater treatment
facilities to produce methane in an anaerobic digester.  The aim of the
project is to run our counties bus system on the methane to decrease the CO2
footprint of public transportation and use a local, nearly carbon-neutral
(since the algae will sink the CO2 released upon combustion) source of
energy.  In order to produce a viable amount of methane, we need to have our
digester filled with large amounts of algal sludge.  Thus, we are trying to
find a good method of flocculating the algae (ideally one that is both
carbon neutral and would be chemical free).  I have heard that chitosan and
an electrolysis would achieve this.  I have also hear that certain fish will
eat the algae even though it is indigestible and the algae will be
flocculated in the feces.  If anyone knows any better methods of algae
flocculation, I would greatly appreciate your help.  If you are interested
in our project, please visit our website lanealgae.org.
Thanks,
-Sean