AltProSystems - The Global Hub for Alternative Protein Production

Why Algae Protein?

Microalgae and cyanobacteria offer one of the most sustainable protein sources on the planet. Species like Chlorella, Spirulina, and Nannochloropsis can produce 50–70% protein by dry weight while fixing CO2 and requiring minimal arable land.

Cultivation Systems Compared

1. Open Raceway Ponds

Simple, low-cost construction

Large surface area for light exposure

Limited species control (contamination risk)

Low productivity (10–20 g/m²/day)

Best for hardy species: Spirulina, Dunaliella

Cost: $0.3–1.0/kg dry weight

2. Closed Tubular Photobioreactors (PBR)

Enclosed system, better contamination control

Higher productivity (20–40 g/m²/day)

Better light distribution

Higher capital and operating costs

Temperature control challenges

Cost: $2–8/kg dry weight

3. Flat-Panel Photobioreactors

Thin-layer design for optimal light utilization

Very high cell densities achievable

Excellent for research and small production

Scaling challenges

Cost: $3–10/kg dry weight

4. Heterotrophic Fermenters

No light required — uses sugar as energy source

Very high productivity and cell density

Standard fermentation equipment applicable

Limited to certain species

Cost: $1–4/kg dry weight

Downstream Processing

**Cell disruption**: Bead milling, high-pressure homogenization

**Extraction**: Aqueous, enzymatic, or solvent-based

**Purification**: Membrane filtration, chromatography

**Drying**: Spray drying or freeze drying

Market Applications

Protein supplements and powders

Food coloring (phycocyanin from Spirulina)

Omega-3 fatty acids (DHA from Schizochytrium)

Animal feed ingredients

Cosmetics and nutraceuticals

Algae Protein Cultivation Systems & Technology