الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
It is widely known that large increasing of population worldwide results in high demand of energy around the world specially increasing the demand of original petroleum products. Petroleum materials are the backbone of most industrial applications. Because of the expected depletion of petroleum materials, it was necessary to look for other alternatives of the petroleum fuels such as biodiesel. most of used biodiesel fuels originally comes from edible or non-edible products. The most appropriate choice among all sources is the biodiesel from algae. The aim of this study is to investigate innovative engineering alternatives to get the highest possible productivity of Scenedesmus obliquus algae. The optimal algae growth rates have been gained as the algal growth media temperature was located between 25 and 30 °C. Also, during the study continuous photobioreactor has been designed to get biomass and Esterified fatty acids (EFA) from the green algal. At different operating conditions of pH and Na2CO3 the optimum PH and Na2CO3 concentrations were 7.5 and 5 g/l, respectively. While, the optimum productivity of S. obliquus algae reached 1.12 (g/l.day) and EFA yield was 377.6 (mg/ l.day) by optimizing cultivation conditions. The solar thermal radiation isolation effect on the cultivation medium temperatures has been investigated. Thermal radiation isolation has been achieved using the mechanical flipping for cultivation medium and by applying a new Air- Bubble-Generation (ABG) system. Rather than, biodiesel extracted from Scenedesmus obliquus algae through the process of transesterification has been used as B50 (blend of 50% diesel and 50% biodiesel) in internal combustion engine. N-Pentane (C5H12) was used as an additive in different extents such as 5 %, 10 % and 15 % to enhance engine performance when using biodiesel in combustion.