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Coagulation is an important step in the harvesting of algal biomass. This paper presents experimental results for a variety of prospective marine microalgal species using several inorganic and organic coagulants. Tetraselmis suecica and Chlorococcum sp. are readily coagulated using alum or iron(III) sulphate without any pH adjustment; doses of 3–5 mg L−1 or 0.2 mmol m−2 of Al3+ or Fe3+ yielding cell...