From waste to energy: Microalgae production in wastewater and glycerol

Abstract

Highest biomass and lipid productivities where achieved at mixotrophic cultivation. Lipids from mixotrophic biomass were more suitable for biodiesel production. Nutrient removal achieved below the most strict threshold limits. Positive energy production scenarios can be designed coupling distinct processes.

Botryococcus , what to do with it? Effect of nutrient concentration on biorefinery potential

“…The estimates were based on the lab scale parameters of productivity and biorefinery, following estimation approach found in [6]. We considered a pilot plant of 20 m 3 , operating in semicontinuous mode with a harvest of 40% per day (8 m 3 ) with 200 work days per year.…”

“…Its chemical composition makes it a versatile platform for biofuels such as bio-ethanol (from starch) and biodiesel (oil) [2,3,6]. Botryococcus biomass can also be used to make lowvalue products, such as fertilizers (from nitrogen and phosphorus), high-value products such as pigments (chlorophyll and carotenoids), and bio-based polymers from starch and other sugars [6]. However, Botryococcus has a particular bottleneck when compared to other species: its relatively slow growth rate of 0.1-0.3 doubling per day [13,29,36].…”

Integration of microalgal cultivation system for wastewater remediation and sustainable biomass production

“…Owing due to requirement of low light intensity, some mixotrophic strains have reduced photoinhibition and growth rates are higher as compared to photoautotrophic and heterotrophic Pahl et al (2013)] cultures. Several researchers have reported that biomass productivities are boosted in mixotrophic cultivation utilizing wastewater as nutrient medium (Cabanelas et al 2013a). Thus, the integration of MWT assisted by utilizing heterotrophic/mixotrophic cultivation can make the process more feasible.…”

“…Microalgae can be used to treat municipal wastewater either by suspension or by immobilized form (Cai et al 2013;de-Bashan and Bashan 2010). Among the various groups of microalgae, Chlorophyta group (Chlorella, Scenedesmus, Botryococcus) are widely used for the wastewater treatment (Cabanelas et al 2013a). The biomass productivity, N and P removal rates for municipal wastewater system by some of the microalgal strains are presented in Table 1.…”

Sustainable Production of Biofuels from Microalgae Using a Biorefinary Approach

“…European Commission Directive 98/15/EEC have specified limits of 10 mgL −1 total nitrogen and 1 mgL −1 total phosphorous for discharge. Normal values of total nitrogen and phosphorous in wastewater effluent are 20-70 and 4-12 mgL −1 (Arbib et al 2014;Cabanelas et al 2013). Discharge of industrial and domestic wastewater are adding organic and inorganic nutrients, pathogens, heavy metals, suspended solids, and oxygen demanding material to the existing water resources.…”