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Solvent Extraction is a process which involves extracting oil from oil-bearing materials by treating it with a low boiler solvent as opposed to extracting the oils by mechanical pressing methods (such as expellers, hydraulic presses, etc.) The solvent extraction method recovers almost all the oils and leaves behind only 0.5% to 0.7% residual oil in the raw material. In the case of mechanical pressing the residual oil left in the oil cake may be anywhere from 6% to 14%. The solvent extraction method can be applied directly to any low oil content raw materials. It can also be used to extract pre-pressed oil cakes obtained from high oil content materials. Because of the high percentage of recovered oil, solvent extraction has become the most popular method of extraction of oils and fats. In a nutshell, the extraction process consists of treating the raw material with hexane and recovering the oil by distillation of the resulting solution of oil in hexane called miscella. Evaporation and condensation from the distillation of miscella recovers the hexane absorbed in the material. The hexane thus recovered is reused for extraction. The low boiling point of hexane (67°C 152°F) and the high solubility of oils and fats in it are the properties exploited in the solvent extraction process. Link

Astaxanthin is a naturally occurring high-value ketocarotenoid pigment with excellent antioxidant effects, Astaxanthin is present in many types of seafood, including salmon, trout, red sea bream, shrimp and lobster, as well as in birds such as flamingo and quail.The global astaxanthin market is estimated at about $257 million, most of which is used in fish coloration (2009 data; estimates by BCC Research for astaxanthin market size are however lower). The human uses market is growing and estimated at about $27-$40 million.

Anaerobic Digester is one of the most commonly used method for treating organic sludges generally resulting from the biological treatment of wastewaters through activated sludge processes. Under this process the organic sludge is treated in the absence of oxygen to reduce both the quantity and odor of sludges by breaking down the organic matter. The resultant sludge is rich in nutrients and organic matter which can improve the soil conditions if applied as soil supplement. - Source