Growth Performance, Biochemical Composition and Nutrient Recovery Ability of Twelve Microalgae Consortia Isolated from Various Local Organic Wastes Grown on Nano-Filtered Pig Slurry

Abstract

This paper demonstrated the growth ability of twelve algae-microbial consortia (AC) isolated from organic wastes when a pig slurry-derived wastewater (NFP) was used as growth substrate in autotrophic cultivation. Nutrient recovery, biochemical composition, fatty acid and amino acid profiles of algae consortia were evaluated and compared. Three algae-microbial consortia, i.e., a Chlorella-dominated consortium (AC_1), a Tetradesmus and Synechocystis co-dominated consortium (AC_10), and a Chlorella and Tetradesmus co-dominated consortium (AC_12) were found to have the best growth rates (µ of 0.55 ± 0.04, 0.52 ± 0.06, and 0.58 ± 0.03 d−1, respectively), which made them good candidates for further applications. The ACs showed high carbohydrates and lipid contents but low contents of both proteins and essential amino acids, probably because of the low N concentration of NFP. AC_1 and AC_12 showed optimal ω6:ω3 ratios of 3.1 and 3.6, which make them interesting from a nutritional point of view.

Protein Quality and Protein Digestibility of Vegetable Creams Reformulated with Microalgae Inclusion

“…The most abundant amino acids in all microalgae species were Arg, Asp, Ala, Lys, and Glu, followed by Pro, Leu, Gly, and Ser. These results agree with previous studies [ 51 , 52 , 53 ], even if other authors reported higher amino acid amounts, comparable to those of eggs and soybeans [ 54 , 55 ]. These differences in values can be due to different harvesting regimes and seasons, drying processes, and strains [ 56 , 57 ].…”

“…Knowledge of amino acid (AA) composition (with particular reference to essential amino acids, EAAs) of microalgae has great importance in the establishment of their nutritional value and potential uses in food applications [ 51 ]. According to the different total protein content, the amino acid content of the ingredients from the four microalgae species included in this study ( Table 1 ) differed significantly, except for cysteine.…”

Sustainable Treatment of Swine Wastewater: Optimizing the Culture Conditions of Tetradesmus cf. obliquus to Improve Treatment Efficiency

“…Meanwhile, the pH of raw wastewater and sterilized wastewater was maintained between 7.00-7.75 and 6.96-7.67, respectively. Therefore, the volatilization of NH + 4 -N and phosphate precipitation at pH > 9 were not involved [38], indicating that the pollutant removal by T. cf. obliquus ZYY1 was mainly through assimilation.…”

Growth Performance and Biochemical Composition of Waste-Isolated Microalgae Consortia Grown on Nano-Filtered Pig Slurry and Cheese Whey under Mixotrophic Conditions

“…In it, twelve algae consortia (ACs) were isolated from sixteen different organic wastes [17]. Then the ACs were tested to treat organic wastes, removing nutrients and producing useful biomass in different modes, i.e., autotrophic mode, as previously reported [12], and mixotrophic mode (this paper), at batch scale, before up-scaling to a pilot plant.…”

“…Microalgae-based processes can reduce by up to half the energy consumption of conventional wastewater treatment and allow the recovery of up to 90% of the nutrients contained in wastewater [11]. Nano-filtered pig slurry permeate (NFP) is the effluent of a pig slurry treatment factory, which contains a high percentage of ammonium (NH 3 -N) in low concentrations and could be considered a suitable nitrogen source to support algal growth [12] since algae prefer ammonium N as the N source.…”