Growth Hormones Promote the Growth of Microalgae in Simulated Flue Gas

HUANG Guan-hua; LI Jun-hao; HE Huan

doi:10.13982/j.mfst.1673-9078.2019.7.019

Abstract：Acidic pollutants in the flue gas have been known as strong toxicity to the environment.Besides,the high concentration of CO2 from flue gas might contributed to the greenhouse effect.Using Chlorella sp as effective biomaterials for fixation of high concentration of COh (15％,V/V),this study was to investigate the tolerance to moderate SO2 and NO2 gas derived from self-installation devices with the help of Gibberellin (GA) and triacontanol (TA).The cultures were exposed to SO2-air mixture (1500 mL,50 mg/kg) and NO2-air mixture (1500 mL,50 mg/kg) per day respectively,and the results showed that the biomass increased by 1.32 times and 1.27 times for GA addition,and increased by 1.22 times and 1.05 times for TA addition,respectively.Besides,the volumes of the cells became larger when growing with addition of GA and TA.The quantification of biochemical composition including protein,lipid,carbohydrate were investigated and the results showed that GA and TA had the same positive effects on the lipid accumulation and the maximal content of lipid,which amounted to 0.62 mg/mg of dry weight.Nevertheless,the content of protein had no obvious changes with the help of GA and TA.High concentration of CO2 had negative effect on carbohydrate production in the algae and the content of carbohydrate was not elevated by the addition of GA and TA.This study reveals the potential of applying Chlorella sp and growth hormones GA and TA to flue gas capture.