Price: Microfiche A01 Printed Copy A08 Codes are used for pricing all publications. The code is determined by the number of pages In the publtcatlon. Information pertaining to the pricing codes can be found in the current tssue of t h e lollow~ng pliblfcilt~ofls, which are generally available in most libraries: Energy Research Abstracts,
high-lipid producers, t h r e e high-carbohydrate producers, t h r e e high-protein producers, and one high-glycerol producer.Based on t h e chemical compositions r e p o r t e d f o r t h e various s p e c i e s , an e s t imate i s f i r s t made of t h e g r o s s energy content a v a i l a b l e from a u n i t mass of each s p e c i e s .Then, options a r e considered t h a t convert each f r a c t i o n i n t o t h e d e s i r e d products.For example, t h e e n t i r e mass might be converted t o methane, t h e carbohydrate fermented t o e t h a n o l , t h e l i p i d converted t o ester f u e l , o r any combintaion of these. ConclusionsAmong t h e high-lipid producing s p e c i e s , Botryococcus b r a u n i i i s unique i n t h a t i t can produce hydrocarbons a t 40% o r higher of i t s t o t a l l i p i d s .Most of t h e s e hydrocarbons a r e benzene-extractable, aromatic-type compounds, which might be d i r e c t l y usable a s l i q u i d f u e l . o f f e r g r e a t p o t e n t i a l a s sources f o r t h e production of methane v i a anaerobic d i g e s t i o n .Due t o t h e i n h e r e n t l y lower energy requirements and higher conversions f o r t h i s process, energy u t i li z a t i o n e f f i c i e n c i e s range from about 68% ( f o r high-protein producers) t o 7 5 % ( f o r high-lipid producers).The high-protein producing s p e c i e s , a s w e l l a s another s t r a i n of D. s a l i n a t h a t produces about 28% g l y c e r o l , might have a n economic advantage due t o t h e i r coproduction of h i g h e r valued products. D e t a i l e d examinations of a l g a l p r o d u c t i v i t y d a t a , a s w e l l a s economic s t u d i e s , a r e not required t o f u r t h e r q u a n t i f y t h e p o t e n t i a l of t h e s e organisms a s renewable f u e l producers.
Price: Microfiche A01 Printed Copy A03 Codes are used for pricing all publications. The code is determined by the number of pages in the publication. Information pertaining to the pricing codes can be found in the current issue of the following publications which are generally available in most libraries: Energy Research Abstracts (ERA): Government Reports Announcements and Index
The potential of macroalgae as sources of renewable liquid and gaseous fuels is evaluated. A series of options for production of macroalgae feedstock is considered. These options include nearshore (for Macrocystis), floating adjacent and nonadjacent (for Sargassum), plus bay/estuarine and land-based options (for Gracilaria and Ulvo), The production option with the lowest feedstock costs is the adjacent strategy for Sargassum, with a cost of $48/dry ash-free metric ton (DAFMT) based on currently sustainable yields, and a potentially achievable cost of $24!DAFMT, based on improved yields. The estuarine option produced costs for Gracilaria and/or Ulva close to those of Sargassum: $54!DAFMT currently, with $27!DAFMT achievable with improved yields. The landbased system cannot produce macroalgae feedstock below $131/DAFMT, even with much higher yields than the nearshore systems. Because of their high carbohydrate content, the fuel products for which macroalgae are most suitable are methane and ethanol. Fuel product costs were compared with projected fuel costs in the year 1995. At currently sustainable yields, Sargassum, Gracilaria, and Ulvo could be competitive sources of methane; with yield improvements, Macrocystis could as well. For the production of ethanol, only Macrocystis and Gracilaria offer competitive production potential, and then only if improved yields can be achieved.
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