Biomass production of Clorella sp. by adjustment of cultivation conditions

Kauno technologijos universitetasVytauto Didžiojo universitetasŽemės ūkio akademij

Green energy from different feedstock processed under anaerobic conditions

The possible use of energy crops and aquaculture for bioenergy production has only recently become a research target, so there is little information on their properties and advantages. The aim of this study was to investigate the possible use of cup plant, as well as marine and freshwater algae (Scenedesmus sp. and Chlorella sp.) for biogas production. Research of a batch anaerobic digestion process at a mesophilic temperature were performed using wet wastewater sludge, cattle manure, fresh microalgae biomass and dry marine algae, cup plant biomass and mixtures of these materials. The highest biogas yield (541.28 ml g-1 VS) was obtained by using a new feedstock from the microalgae Scenedesmus sp. biomass. That yield was 1.4 times higher than the biogas yield from cattle manure and 15% lower than the biogas yield from wastewater sludge. It was found that adding microalgae biomass to a cattle manure substrate increases biogas production approx. 1.5 times. The highest methane concentration in biogas produced from microalgae ranges from 64.87% to 66.66% and exceeds the methane amount (64.26%) in biogas produced from wastewater sludge. The methane amount in biogas produced from cattle manure, cup plant and marine algae biomass is lower than 60%. In addition, it was found that it is possible to produce 5,092.3 m3 of biogas or 113 GJ of energy from 1 ha of harvested cup plant biomassLietuvos agrarinių ir miškų mokslų centro Vėžaičių filialasVytauto Didžiojo universitetasŽemės ūkio akademij

Influence of amount of carbon dioxide on growth of algae biomass

The biofixation of carbon dioxide using various concentrations by green microulgm' Chlorella sp. has been researched. Chlorella sp. was cultivated under static condition (without supply of C02) and using aerated method. It was found that, the influence ol' llir concentration of C02 on growth of algae biomass has linear characteristic. The hip.f.rsi concentration of algae biomass is achieved supplying biomass by C02 of concciilriilion ' I %. The result of the research indicates that it is worth continuing investigation will) continuous supply of C02 and analysing efficiency of purification of exhaust gasKauno technologijos universitetasVytauto Didžiojo universitetasŽemės ūkio akademij