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Table 3 Comparative energy and cost analysis of different microalgae harvesting technologies

From: Harvesting of freshwater microalgae with microbial bioflocculant: a pilot-scale study

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]
  1. The energy consumption and cost data of microalgae harvesting are presented based on the culture medium (m3) treated and dry mass (kg) produced, respectively
  2. aNot determined