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Biotreatment of landfill leachate by microalgae-bacteria consortium in sequencing batch mode and product utilization

Tighiri, Harrison Onome, Erkurt, Emrah Ahmet
Bioresource technology 2019 v.286 pp. 121396
ammonium nitrogen, bacteria, biomass production, biorefining, chemical oxygen demand, fatty acid composition, glycerol, landfill leachates, microalgae, nitrates, phenol, photobioreactors, product utilization, toxicity
Biotreatment of leachate by microalgae-bacteria in a sequencing batch mode using a photobioreactor was investigated. The microalgae-bacteria biomass initial concentration was maintained at 3:1 ratio. The increase in the initial concentration of the biomass in the 2nd batch favoured biomass growth, doubling biomass productivity, compared to the 1st batch. In both batches, N-NH4 was completely removed from the leachate. In the 2nd batch, the nitrate, COD and phenol removal efficiencies were above 90%. The relative toxicity reduced from 57.32 to 1.12% at the end of 2nd batch. The fatty acids content (C16-18) varied from 85.47 to 87.65% for the 1st batch and 86.72 to 87.69% for the 2nd batch. The crude glycerol content varied from 34.54 to 42.36% for the 1st batch and 33.64 to 39.55% for the 2nd batch. The coexistence of microalgae and bacteria played an important role in leachate treatment and biomass production for biorefinery purposes.