The Nutritive Value of Waste-Grown Algae

Cook, Bessie B.

doi:10.2105/ajph.52.2.243

Cited by 24 publications

(4 citation statements)

References 10 publications

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“…Researches also began to look into wastewater-grown microalgae as a potential food source. The idea of combining wastewater treatment and food production using microalgae was briefly studied, but abandoned for a variety of reasons (Cook, 1962;Hintz et al, 1966;Lubitz, 1963). Additionally, research into the use of wastewater-grown microalgae for energy production started with the use of microalgae as a feedstock for methane production Golueke & Oswald, 1963b;Meier, 1955) as well as oxygen generators for biochemical fuel cells (Berk & Canfield, 1964;Lewis, 1966).…”

Section: Early Microalgae Wastewater Treatment Researchmentioning

confidence: 99%

Microalgae Wastewater Treatment: A Brief History

Paddock¹

2019

Preprint

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Section: Early Microalgae Wastewater Treatment Researchmentioning

confidence: 99%

Microalgae Wastewater Treatment: A Brief History

Paddock¹

2019

Preprint

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“…However, very dense concentrations of algae develop in sewage oxi-dation ponds, particularly in ponds with short detention periods, and can be separated from the pond fluids (Oswald, Golueke, and Gee, 1959). The nutritional value of such algae was investigated by, among others, Cook (1962). He found that the dried products of a mixed culture of a Chlorella sp.…”

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confidence: 99%

Amino Acid Composition of Bulk Protein of Euglena Grown in Waste Water

Kott

Wachs

1964

Applied Microbiology

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AND A. M. WACHS. Amino acid composition of bulk protein of Euglena grown in waste water. Appl. Microbiol. 12:292-294. 1964.-The amino acid content of bulk protein in a sewage-grown Euglena sp. was examined. Concentrations of the essential amino acids, threonine, histidine, tryptophan, and valine, were similar to those found in other algae. The concentration of alanine was much higher. Methionine was not found at all, proline only in traces, and other amino acids at low concentrations. These results indicate that the amino acid content of bulk protein of the species of Euglena studied resembles that of plants far more closely than that of animals.

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“…A reoccurring explanation for a decrease in methane yield induced by heat treatment may be the formation of recalcitrant, inhibitory compounds (Alzate et al, 2012). Furthermore, in a study that evaluated wastegrown algae as a potential animal feed, it was determined that the control group of rats fed autoclaved algae suffered the greatest weight loss due to a low feed conversion ratio (g gain/ g consumed), at roughly half that of dried algae (Cook, 1962). That result substantiates the notion that some pretreatment technologies involving high heat and/or pressure may negatively impact the biomass nutrient content that would diminish the efficacy of anaerobic bacterial conversion to methane.…”

Section: Neutral To Negative Effects Of High Heat On Biodegradabilitymentioning

confidence: 99%

The Effect of Pretreatment Methods on Methane Yield and Nutrient Solubilization During Anaerobic Digestion of Microalgae

Hill¹

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Microalgal biomass is a candidate feedstock for biofuel production. To improve the sustainability of algae biofuel production, following biofuel recovery, the biomass nutrients should be recycled for additional algae growth. Anaerobic digestion of algae or oil-extracted algae is a means of recovering carbon and other nutrients, while offsetting algae production electricity demand. The major limiting factor in microalgae digestion is the low biodegradability of the cell walls. In the present study, various pretreatment technologies were tested at bench scale for their ability to improve raw, non-lipidextracted algae biodegradability, which was assessed in terms of methane yield, volatile solids destruction, and solubilization of N, P, and K. The microalgae were harvested by sedimentation from outdoor wastewater-fed raceways ponds operated in coastal southern California. Four pretreatment methods (sonication, high-pressure homogenization, autoclaving, and boiling) were used on the algae slurries, each followed by batch anaerobic digestion (40 days at 35 o C). Biomass sonication for 10 minutes showed the highest methane yield of 0.315 L CH 4 / g VS IN , which is a 28% increase over the untreated control. Conversely, autoclaved algae slurry inhibited methane production (0.200 vs. 0.228 L CH 4 / g VS IN for the treatment and control). A preliminary energy balance indicated that none of the pretreatments led to a net increase in energy conversion to biomethane. However, pretreatment did increase the initial N and P solubilization rates, but, after digestion, the ultimate N and P solubilization was nearly the same among the treatments and controls. After 40 days of digestion, solubilization of N, P, and K v reached, respectively, 50-60% of average total Kjeldahl N, 40-50% of average total P, and 80-90% of average total K. Descriptive first-order models of solubilization were developed. Overall, certain pretreatments marginally improved methane yield and nutrient solubilization rate, which cast doubt on the efficacy of, or even the need for, algae biomass pretreatment prior to anaerobic digestion.

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The Nutritive Value of Waste-Grown Algae

Cited by 24 publications

References 10 publications

Microalgae Wastewater Treatment: A Brief History

Microalgae Wastewater Treatment: A Brief History

Amino Acid Composition of Bulk Protein of Euglena Grown in Waste Water

The Effect of Pretreatment Methods on Methane Yield and Nutrient Solubilization During Anaerobic Digestion of Microalgae

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