A comparison of growth rate of algae as influenced by variation in nitrogen nutrition inChlorella pyrenoidosa andScenedesmus obliquus

Dvořáková-Hladká, Jiřina

doi:10.1007/bf02930740

Cited by 4 publications

(1 citation statement)

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“…Growth on ammonium has been documented for various algae strains, but limitations have also been reported including lower growth rates and lipid productivity when compared to growth on nitrate (Bongers 1956;Chen et al 2011;Dvořáková-Hladká 1971;Li et al 2008;Ludwig 1938;Pavlova et al 1994;Thacker and Syrett 1972;Xin et al 2010). Decreases in algae growth utilizing ammonium are attributed to three phenomena: (1) Algae growth on ammonium translocates a proton out of the cell to maintain cell neutrality during uptake of the cation, thus decreasing the pH of the medium (Fuggi et al 1981;Goldman and Brewer 1980;Xin et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Growth, nitrogen utilization and biodiesel potential for two chlorophytes grown on ammonium, nitrate or urea

et al. 2013

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Nitrogen removal from wastewater by algae provides the potential benefit of producing lipids for biodiesel and biomass for anaerobic digestion. Further, ammonium is the renewable form of nitrogen produced during anaerobic digestion and one of the main nitrogen sources associated with wastewater. The wastewater isolates Scenedesmus sp. 131 and Monoraphidium sp. 92 were grown with ammoni-um, nitrate, or urea in the presence of 5 % CO 2 ,and ammonium and nitrate in the presence of air to optimize the growth and biofuel production of these chlorophytes. Results showed that growth on ammonium, in both 5 % CO 2 and air, caused a significant decrease in pH during the exponential phase causing growth inhibition due to the low buffering capacity of the medium. Therefore, biological buffers and pH controllers were utilized to prevent a decrease in pH. Growth on ammonium with pH control (synthetic buffers or KOH dosing) demonstrated that growth (rate and yield), biodiesel production, and ammonium utilization, similar to nitrate-and urea-amended treatments, can be achieved if sufficient CO 2 is available. Since the use of buffers is economically limited to laboratory-scale experiments , chemical pH control could bridge the gap encountered in the scale-up to industrial processes.

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