Biotreatment of swine wastewater via microalgae is an environmentally
sustainable strategy capable to transform nitrogen, phosphorous, and
organic/inorganic carbons into value added products, while microalgal
species with efficient COD and ammonium removal efficiency is lacking,
limiting its practical application. Thermophilic and acidophilic
Galdieria sulphuraria ( G. sulphuraria) are reported to
have high ammonium removal efficiency, while its application in swine
wastewater treatment is rarely reported. Accordingly, mixotrophic
G. sulphuraria has been tested for biotreatment of swine
wastewater. The results indicate that G. sulphuraria can grow
well in swine wastewater with maximum growth rate of 0.72 g/(L.d) when
15 g/L of glucose is added. Maximum COD removal efficiency of 94.8% and
ammonium removal rate of 550.5 mg/(L.d) are observed with 15 g/L of
glucose added. Addition of glucose leads to decreases of lipid, protein
and ash contents, and simultaneous increase of carbohydrates owing to
the varied C/N ratios. The biomass has relatively lower carbon content
of 48.5% with 20 g/L glucose than 49.3% of control, consequently leads
to a relatively lower HHV value of 20.64 MJ.kg .
Above all, mixotrophic G. sulphuraria are promising strategy for
swine wastewater treatment with high energy recovery, potentially
providing an economical strategy for swine wastewater treatment.
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