Abstract
This paper explores the ability of Chlorella sp. and Scenedesmus sp. to convert landfill leachates into usable metabolites. Different concentrations (0.5, 1, 5, and 10% v/v) of leachate coupled with an inorganic carbon source (Na2CO3, and NaHCO3) were tested to improve biomass production, metabolites synthesis, and removal of NO3 and PO4. The result shows that both strains can effectively grow in media with up to 5% (v/v) leachate, while significantly reducing the concentrations of NO3, and PO4 (80 and 50%, respectively). The addition of NaHCO3 as a carbon source improved the final concentration of biomass, lipids, carbohydrates, and the removal of NO3 and PO4 in both strains.
Highlights
This paper explores the ability of Chlorella sp. and Scenedesmus sp. to convert landfill leachates into usable metabolites
The measurement of BOD5 and Chemical Oxygen Demand (COD) parameters is directly related to organic matter contamination and the age of a landfill, as this factor plays a fundamental role in the leachate composition [46]
Both strains were able to grow in media with up to 5% (v/v) leachate with a high concentration of biomass and removal of 80% (w/w) of NO3, and 50% (w/w) of PO4
Summary
This paper explores the ability of Chlorella sp. and Scenedesmus sp. to convert landfill leachates into usable metabolites. Different concentrations (0.5, 1, 5, and 10% v/v) of leachate coupled with an inorganic carbon source (Na2 CO3 , and NaHCO3 ) were tested to improve biomass production, metabolites synthesis, and removal of NO3 and PO4. There are different technologies (physical, chemical, and even biological) available for the treatment of this type of waste [3] Their low efficiency in reducing the pollutant capacity of this type of liquid waste and their low economic sustainability have led researchers worldwide to explore new technologies [4]. Microalgae and cyanobacteria are highly diverse photosynthetic microorganisms found in diverse aquatic environments [5] They are considered one of the novel biotechnological sources of different metabolites such as lipids, carotenoids, proteins, carbohydrates, bioplastics, auxins, mycosporine-like amino acids (MAA), and others [6]. According to a SCOPUS search with the keywords “Landfill AND Leachate AND alga”, during the last 22 years, about 102 scientific papers have been published (Figure 1a), especially in countries like China, United States, Brazil, and others (Figure 1b), which is few Academic Editor: Sébastien Jubeau
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