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Microalgae growth rate changes according to the medium components, environment and characteristic features of that particular alga. Hence algal biomass production can be accelerated by giving needed nutrient medium, pH, salinity and light intensity and these can be controlled in a closed bioreactor. In this study, the lab-scale Photo bioreactor was designed to produce low-cost algal biomass. The LED lights were used to give the needed light to the algal growth. This study also evaluates the effects of different culture media in culturing Tetraselmis sp. The growth rate of algal culture was checked using haemocytometer by counting algal cells. Media like BBM, ASN III, Walne's medium and NPK seawater solution was used to study the growth curve of the culture. The produced biomass was dried using hot air and then determined the dry weight of biomass. Growth study resulted Walne's medium and NPK seawater solution was found to be best to grow Tetraselmis sp. The designed Photo bioreactor was good to culture algae under LED light and it resulted in the good biomass. Keywords— Algal Growth curve; ASN III, BBM; Haemocytometer; LED light; NPK seawater solution; Tetraselmis sp.; Walne’s medium.

Low Cost Photo Bioreactor for Marine microalga Cutivation