Biochar production from microalgae: a new sustainable approach to wastewater treatment based on a circular economy.

The generation of wastewater due to human activities are the main responsible for environmental problems. These problems are caused by the large amount of organic and inorganic pollutants related to the presence of pesticides, metals, pathogens, drugs and dyes. The photosynthetic treatment of effluents emerges as a sustainable and low-cost alternative for developing wastewater treatment systems based on a circular economy.

Use of exogenous substrate in Chlorella cultivation: Strategy for biomass and polyhydroxybutyrate production.

The aim of this study was to investigate the influence of exogenous carbon supplementation and nitrogen source reduction on Chlorella fusca LEB 111 growth, biomass composition, and polyhydroxybutyrate accumulation. First, assays were performed with 50 % and 25 % reduced nitrogen source concentrations (NaNO). In the second stage, the influence of culture supplementation with 10, 20, and 30 mg L D-xylose, associated with 50 and 25 % reductions in NaNO, was evaluated.

Polyhydroxybutyrate production and increased macromolecule content in Chlamydomonas reinhardtii cultivated with xylose and reduced nitrogen levels.

The aim of the current study was to evaluate the production of macromolecules such as polyhydroxybutyrate under pentose supplementation and reduced nitrogen levels in Chlamydomonas reinhardtii. Two batches of experiments were carried out: (1) reduction in the nitrogen (NHCl) concentration to 6 and 4 g L and (2) supplementation of 10, 20 and 30 mg L D-xylose together with a reduction in the NHCl concentration (6 and 4 g L). The addition of 20 mg L D-xylose together with 6 g L NHCl resulted in polyhydroxybutyrate production (206.