Production of biomass and lipids using a Chlorella consortium growing in human urine: Modeling the N and P removals
LG Torres, I Flores-Guerrero, LJ Corzo-Rios, Jorge I Chairez
In recent years, the use of dry baths is becoming popular. These artifacts consist of urinals where urine is recollected without dilution or mixture with human wastes. This urine current can be employed with different purposes such as hydroponics, agricultural irrigation and others. Some authors (Torres et al. 2014 among them)  Have demonstrated that urine in water dilutions are very feasible to grow autotrophicaly microalgae, due to its high contents of total nitrogen and P. In this work, a consortium composed by Chlorella, Scenedesmus and some diatoms was grown in urine dilutions (1/50 to 1/200) and the removal of N and P were evaluated, as well as the biomass and lipids production. Using these data, P and N removal kinetics were established. From these assessments it was shown that for the 1/200 dilution it was achieved an N removal efficiency of 90 %, and the lowest efficiency occurred with the 1/150 dilution (42%). Regarding P, It was noted that for the 1/100 and 1/150 dilutions the best P removal efficiencies were obtained (61%). At the same time, biomass concentrations up to 1,300 mg/L were achieved. Final lipid concentrations were high, with an average of 178.28 mg/L for the different dilutions.
LG Torres, I Flores-Guerrero, LJ Corzo-Rios, Jorge I Chairez. Production of biomass and lipids using a Chlorella consortium growing in human urine: Modeling the N and P removals. European Journal of Biotechnology and Bioscience, Volume 5, Issue 4, 2017, Pages 68-70