Question

hypothesize other methods to either increase the oil content of microalgae or to grow greater amount of microalgae for biodiesel production

Answer 1

Aside from open pond growing algae and vertical closed loop production of micro-algae, another method to increase the oil content of micro-algae  is through a closed- drum production.  In this method, the indoor bioreactor plants will be grown in a huge round drum under an ideal or suitable environment that could produce maximum level of algae, which in turn yields large amounts of oil for biodiesel.