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dc.contributor.advisorChanakya, H N
dc.contributor.authorAbitha, R
dc.date.accessioned2018-10-01T13:17:29Z
dc.date.available2018-10-01T13:17:29Z
dc.date.submitted2016
dc.identifier.urihttps://etd.iisc.ac.in/handle/2005/4070
dc.description.abstractAlgal biofuel has been shown to have great potential to solve the World’s sustainable energy crisis but technologies for large-scale cultivation are still elusive. While photobioreactors meet very high value algal products there is still no technology for producing algae by the millions of tons. Flooded paddy lands of India offer excellent opportunities for co-cultivation of algae with paddy crop provided it meets various sustainability criteria, not to mention very low cost options. This research examines sustainability, technology and climate change challenges to this above concept termed “Algiculture”. The potential of naturally emerging algal consortia to overcome travails of pure-culture, the ability to scavenge ‘lost’ plant nutrients in flooded paddy, overcome threats by grazers and predators, evolving naturally mediated techniques to harvest algae, impact on methane emissions, etc. were examined critically under laboratory and flooded paddy conditions. Experimental results indicate that many of the sustainability criteria can be met by growing algae simultaneously with a paddy crop for the first 60-75d which doubles the overall biomass yield from such lands. Algae raised can scavenge ammoniacal-N that generally occurs as unavoidable losses in flooded paddy system and can thus be raised without additional fertilizer inputs. This simultaneously ameliorates the N-pollution from paddy runoff to water bodies. Algal cultivation with paddy (Algiculture) alters micro-environmental conditions e.g. oxygen supersaturation, to make methane emissions unfavourable and by contrast algae even take up the C hitherto wasted away as methane and thereby converting an environmental liability to conservation. Consortia dominated by Chlorella and Chlorococcum sp. along with a small number of Cyanophycaeans facilitate simple low energy algal harvest techniques employing clumping and floc-formation that enables maintaining appropriate stocking density of algae and allowing continuous operation. The pattern of grazer /predator occurrence in such systems, techniques to minimize their influence by merely altering the cultivation conditions have been worked out and tested successful. The causes of reduction in methane emissions and C-source identification have been assessed with 13C discrimination studies. The research creates a new potential reducing GHG on the one hand for also raising sustainable bioenergy options in India as well as in all flooded paddy lands of the worlden_US
dc.language.isoen_USen_US
dc.relation.ispartofseriesG27886;
dc.rightsI grant Indian Institute of Science the right to archive and to make available my thesis or dissertation in whole or in part in all forms of media, now hereafter known. I retain all proprietary rights, such as patent rights. I also retain the right to use in future works (such as articles or books) all or part of this thesis or dissertationen_US
dc.subjectAlgae Cultivationen_US
dc.subjectAlgal Biofuelen_US
dc.subjectGreen House Gasesen_US
dc.subjectAlgal Biomassen_US
dc.subjectAlgal Biofuel Cultivationen_US
dc.subjectGreen Algae Cultivationen_US
dc.subjectAlgal Grazersen_US
dc.subjectAlgal Grazingen_US
dc.subjectAlgicultureen_US
dc.subjectBiogas Slurryen_US
dc.subjectAlgal Culturesen_US
dc.subjectGreen Alga Bottryococcus brauniien_US
dc.subject.classificationSustainable Technologiesen_US
dc.titleAlgiculture - A Novel Algae Cultivation Technique for Sustinable Algal Biofuel Production and Capture of Green House Gasesen_US
dc.typeThesisen_US
dc.degree.namePhDen_US
dc.degree.levelDoctoralen_US
dc.degree.grantorIndian Institute of Scienceen_US
dc.degree.disciplineEngineeringen_US


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