Table 3.
Comparative energy and cost analysis of different microalgae harvesting technologies
| Harvesting method | Algae species | Energy input (kWh/m3) | Cost ($/kg) | References |
|---|---|---|---|---|
| Microbial induced flocculation | Pleurochrysis carterae | 0.45 × 10−3 | 0.24 | [36] |
| Centrifugation | Scenedesmus, Coelastrum proboscideum | 0.3–8 | 1.44–18 | [55] |
| Flotation with vacuum gas lift | Not precised | 0.8–1.69 | 0.022–0.44 | [39] |
| Filtration with vacuum filter | Scenedesmus, Chlorella proboscideum | 0.1–5.9 | 0.96–9 | [55] |
| Electro-flocculation | Tetraselmis sp. | 0.092 | 0.19 | [44] |
| Flocculation with Tanfloc | Scenedesmus sp. | NDa | 1.10 | [38] |
| Flocculation with Zetag 7650 and Al2(SO4)3 | Tetraselmis suecica | 14.81 | ~1.8 | [56] |
| Filtration with pressure filters | Chlorella proboscideum | 0.5–0.88 | 0.8–2.2 | [55] |
| Flocculation with chitosan | Scenedesmus sp. | ND | 10.00 | [38] |
| Tangential flow filtration (TFF) | Tetraselmis suecica | 2.06 | ~0.26 | [56] |
The energy consumption and cost data of microalgae harvesting are presented based on the culture medium (m3) treated and dry mass (kg) produced, respectively
aNot determined