In the field of wastewater treatment, biogas production is perhaps
the most straightforward option for microalgal biomass valorization
[16,17]. Indeed, anaerobic digestion has a long tradition in the context of wastewater treatment and this expertise fully justifies the use of
microalgae for this purpose. Nevertheless, if microalgae are separated
and thickenedwith coagulation–flocculation and sedimentation it is evident
that flocculants should not be toxic or inhibit the anaerobic digestion
process. Natural organic flocculants could meet this requirement;
to our knowledge though it has yet to be confirmed.
The objective of the present study is to evaluate two tannin-based
cationic flocculants for coagulation–flocculation and sedimentation of
microalgae grown in experimental HRAP for wastewater treatment. In
particular the study aimed at: 1) determining the optimal flocculant
doses with jar tests, 2) studying the settling of formed flocs using settling
column tests, and 3) assessing the effect of flocculants on biomass
anaerobic digestion by means of biochemical methane potential tests.
To the best of our knowledge, this is the first time that natural flocculants
are evaluated not only on their efficiency, but also on their effect
on downstream processing.
In the field of wastewater treatment, biogas production is perhapsthe most straightforward option for microalgal biomass valorization[16,17]. Indeed, anaerobic digestion has a long tradition in the context of wastewater treatment and this expertise fully justifies the use ofmicroalgae for this purpose. Nevertheless, if microalgae are separatedand thickenedwith coagulation–flocculation and sedimentation it is evidentthat flocculants should not be toxic or inhibit the anaerobic digestionprocess. Natural organic flocculants could meet this requirement;to our knowledge though it has yet to be confirmed.The objective of the present study is to evaluate two tannin-basedcationic flocculants for coagulation–flocculation and sedimentation ofmicroalgae grown in experimental HRAP for wastewater treatment. Inparticular the study aimed at: 1) determining the optimal flocculantdoses with jar tests, 2) studying the settling of formed flocs using settlingcolumn tests, and 3) assessing the effect of flocculants on biomassanaerobic digestion by means of biochemical methane potential tests.To the best of our knowledge, this is the first time that natural flocculantsare evaluated not only on their efficiency, but also on their effecton downstream processing.
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