[Digestion] Growing Algae from biogas CO2 and digestate liquor

[mark at gaiacooperative.com]

Dear Wayne,

The best (cheapest and most reliable) system to use for algal production is
a shallow high rate algal oxidation ponds (HRAP), usually in sets of 60 x 8m
with a very slow moving paddle wheel (see attached) Typically betseen 10 to
35cm deep depending on the the turbidity of the effluent (usually a function
of COD).  If you are using 8 to 10 % solids you will need a good settling
tank before the high rate algal pond. If you are using sewage wastewater
with minimal solids its best to use a facultative pond with at least a 10
day retention time where the effluent is introduced at at least 1.5 m deep
to avoid the smells (the anoxic algae will grow in this pond). The effluent
from this pond should be taken at least1 meter below the surface to avoid
contamination of the high rate algal pond.  

With a paddle wheel in operation, the algal strains produced in the HRAP are
not problematic and can be used for aquaculture feed. Tilapia and marron are
a good combination. Also the nutrient rich highly oxygenated effluent form
the algal ponds will lead to the production of zooplankton which is a good
aquaculture feed. 

Best Wishes 

Mark

 

  _____  

From: digestion-bounces at lists.bioenergylists.org
[mailto:digestion-bounces at lists.bioenergylists.org] On Behalf Of Wayne
Zschech
Sent: 14 October 2011 07:53 AM
To: digestion at lists.bioenergylists.org
Subject: [Digestion] Growing Algae from biogas CO2 and digestate liquor

 

G'day all,

Can someone point me in the right direction about how to set up biogas
(CO2), CHP heat and digestate liquor for algae growing?  I am also looking
for info on easy to grow, fast growing algae strains that we can use as
animal/fish feed or other easily useable/sellable products. 

 

Biogas isn't really well known in Ukraine. I would really like to show
people visiting my test digester how biogas technology can be integrated
into other useful areas.  We're thinking that a little green house next to
thr reactor with algae and a fish tank would be an interesting proof of
concept.

 

Where can I find information on what nutrients are in the liquor from
different feedstocks? And which algae would grow on them best would also be
appreciated. Also what of obstacles or limiting factors can I expect to
encounter? 

Biogas feedstock will be mainly restaurant food waste.  We have access also
to pig manure and grass clippings and green waste.  

Blessings,
Wayne

  _____  

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