The Adaptation of Common Wastewater to Alga Spirulina

Reclaimed water,industrial sewage and aquaculture effluent were used to cultivate green alga Spirulina subsalsa 351,S.maxism 438,S.platensis.834,S.fusiformis TJSD and Spirulina NMG isolated from lakes in Inner Mongolia.The S.subsalsa 351 cultivated by freshwater-aquaculture effluent were showed to have the the best growth on the basis of the biaomass and the alga color.Thus,the effects of baking soda,sodium nitrate,light intensity and temperature on growth of S.subsalsa 351 were studied in a single factor experiment.It was found that the S.subsalsa 351 had good growth at concentration of 3.0 ~ 13.5 g/L for baking soda,1.0～2.0 g/L for sodium nitrate,tempreature from 25 ℃ to 40 ℃,and light intensity of 6000 ~ 12 000 lx.The results showed that the dry biomass of 3.15 g/L was obtained at the baking soda concentration of 9.0 g/L,sodium 1.0 g/L,light intensity of 10 000 lx and temperature of 32 ℃ with the maximal protein content of 31.7% under the light intensity of 9000 lx,and temperature of 25 ℃,indicating that it is feasible to culture S.subsalsa 351 in freshwater aquaculture effluent.