Study on the nitrogen and phosphorus removal efficiency and cellular nutrient accumulation of three green algae in municipal wastewater treatment
In this study,three types of green algae(Chlorella sp.,Scenedesmus quadricauda and Scenedesmus acuminatus)were used as the research subjects to explore their nitrogen and phosphorus removal efficiency in municipal wastewater.These algae were cultured for 18 days in sterilized and non-sterilized raw municipal sewage water to establish pure algae culture and algae-bacteria co-culture systems.The cellular nutrient accumulation of three green algae was compared from a resource perspective.The results indicated that all three types of green algae grew well,with the algae in the algae-bacteria co-culture system exhibiting higher photosynthetic potential.The concentrations of total nitrogen(TN),total phosphorus(TP),and ammonia nitrogen in the culture medium significantly decreased with the increase in cultivation time(p＜0.05),with removal rates were above 51％,76％,and 55％,respectively.Chlorella sp.showed superior removal efficiency,particularly in the co-culture system,which was significantly better than the pure algae culture system(p＜0.05).Cellular nutrient measurements showed that Chlorella sp.had higher protein and total lipid yield than the other two species,especially in the presence of bacteria.In conclusion,Chlorella sp.had greater potential for municipal wastewater purification,and the algae-bacteria co-culture environment was more favorable for nitrogen and phosphorus removal as well as cellular nutrient accumulation.
green algaemunicipal wastewaternitrogen and phosphorus removalcell nutrition
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