solution the apparatus of fig2 has been used to run comparative experiments with growth in ponds as detailed hereinafter an apparatus was built according to the embodiment of fig2 having the following structural characteristics perimeter of the horizontal cross section of each cell 40 cm height total 2 0 m full 1 80 m distance between two adjacent cells 2 cm in this apparatus there was growth of the green microalga chlorella emersonii from which a number of materials can be produced growth took place outdoors starting with a biomass of 1 u00d7 10 6 cells ml using an n 8 nutrient solution which is identified in table i below table i______________________________________component weight g lit in nutrient solution______________________________________kno sub 3 0 1 1 000cacl sub 2 u00d7 2h sub 2 o 0 013na sub 2 hpo sub 4 u00d7 2h sub 2 o 0 260kh sub 2 po sub 4 0 740mgso sub 4 u00d7 7h sub 2 o 0 050feedta 0 010al sub 2 so sub 4 sub 3 u00d7 18h sub 2 o 0 035 u00d7 10 sup 4mncl sub 2 u00d7 4h sub 2 o 0 013 u00d7 10 sup 3cuso sub 4 u00d7 5h sub 2 o 0 018 u00d7 10 sup 4znso sub 4 u00d7 7h sub 2 o.