초록
<P><B>Abstract</B></P> <P>The aim of this study is to evaluate locally available algae <I>Fucus vesiculosus, Ulva Intestinalis and Cerathophyllum demersum</I> using biomethane potential laboratory tests. Mechanical pre-treatment (cutting) and washing are applied to study the effects on cumulative biogas yield. <I>Fucus vesiculosus</I> (cut and washed) produced 81.8 l CH<SUB>4</SUB>/kg VS, <I>Ulva intestinalis</I> (cut and washed) produced 92.1 l CH<SUB>4</SUB>/kg VS and <I>Cerathophyllum demersum</I> (untreated) produced 405.3 l CH<SUB>4</SUB>/kg VS. For marine algae, the effect of pre-treatments varies from 17 % to 44 %, for freshwater algae it varies between –12 % and 5 %. Best t-test and p values are for washed <I>Ulva intestinalis</I>. Results show that from three tested algae species, <I>Cerathophyllum demersum</I> is the most suitable algae for biogas production in Latvia, but more detailed analysis of environmental, economical and legal aspects is needed.</P>