Abstract: The present invention relates to an improved process for the preparation of biodiesel from triglyceride oils through transesterification, particularly the fatty acid methyl ester of oil mechanically expelled from whole seeds of Jatropha curcas, a plant with potential for cultivation on wastelands in India and other countries, all unit operations being carried out at ambient temperature.

Abstract: This invention provides animal powered mechanical device for water desalination. It has unique features of using animal power as prime mover to effect brackish water desalination. Animal energy in form of high-torque low-speed can be converted into low-torque high-speed through speed increaser (4) to energize the high-pressure pump (6), the outlet manifold (8) of the pump (6) being connected to a reverse osmosis membrane module (9). With this device animal power can be used for obtaining safe drinking water from backish ground water/seawater resource in villages.