a portable system and method for producing biofuel from algae are disclosed . in the portable system , a chemostat and a plug flow reactor formed from plastic bladders are interconnected . further , an algae separator is in fluid communication with the plug flow reactor for removing algae cells . also , the system includes a device for processing biofuel from the algae cells . importantly , the system includes a temperature controller to maintain desired temperatures in the chemostat and plug flow reactor for algae growth and intracellular algae production . in order to further support algae cell growth , the system includes a device for capturing carbon dioxide and delivering the carbon dioxide to the chemostat .