Optimization of photosynthetic biogas upgrading in closed photobioreactors combined with algal biomass production

Piggery Wastewater Treatment Using Photosynthetic Microorganisms

“…This process is carried out by the symbiotic action of bacteria and archaea in the absence of O2 or oxidized forms of nitrogen. Those microorganisms degrade the organic matter present in PWW producing mainly methane (CH4) at concentrations ranging from 40 to 75%, carbon dioxide (CO2) at concentrations of 15 to 60% and other gases at lower concentrations such as hydrogen (H2 > 1%), ammonium (NH3 > 1%), oxygen (O2 > 1%) and hydrogen sulfide (H2S > 3%) [29][30][31]. This type of technology allows the conversion of PWW into a renewable gas energy product, namely biogas.…”

“…PPB biomass contains a high content of pigments (bacteriochlorophylls and carotenoids), single cell protein, coenzyme Q10, pantothenic acid, amino acid 5-ALA and polyhydroxyalkanoates [56]. On the other hand, microalgae can synthetize high concentrations of carbohydrates, proteins, lipids and pigments (chlorophylls and carotenoids) [30,70]. In addition, the biomass of photosynthetic microorganisms can be used as a feedstock for the production of biofuels like biodiesel and bioethanol [90], while some species of PPB and cyanobacteria are capable of producing biohydrogen.…”

“…Finally, methanogenic archaea transform the acetic acid, carbon dioxide and H2 into biogas during the methanogenic step [114]. Biogas is a mixture of gases mainly composed of high concentrations of methane (40-75%), carbon dioxide (15-60%), hydrogen sulfide (0.005-3%), nitrogen (0-2%) and oxygen (0-1%) [30]. Biogas upgrading to biomethane is necessary to remove unwanted gases such as CO2 and H2S if biogas is used as vehicle fuel or injected into natural gas grids.…”

Influence of mesoporous iron based nanoparticles on Chlorella sorokiniana metabolism during photosynthetic biogas upgrading

“…The biomass obtained from test series II and III was harvested (10000 rpm, 4 • C) and freeze-dried for further macromolecular characterization. The carbohydrate content was determined according to [25], while the lipid content was determined gravimetrically following biomass extraction with chloroform:methanol (2:1 v v − 1 ) as described elsewhere [26]. Physisorption analysis was conducted in an ASAP 2050 (Micromeritics, USA) at 77 K using nitrogen to determine the surface area, pore volume and avarage pore diameter of the NPs.…”

Biogas from Anaerobic Digestion as an Energy Vector: Current Upgrading Development

“…This technology was initially optimized at TLR 5 in indoor and outdoor photobioreactors, both in 180 L high-rate algal ponds or 120 L enclosed tubular photobioreactors, using synthetic biogas and real digestates [138]. In addition, this technology was validated outdoors at TLR 6 in a 10 m 3 high-rate algal pond and in enclosed photobioreactors (11 m 3 ) using real industrial and agricultural wastewater under the framework of the European project INCOVER.…”