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- W2068383786 abstract "The freshwater alga Scenedesmus obliquus was grown in continuous culture at a fixed dilution rate of 0.5/day, but at varying pH in the range 4.17–10.67. The pH was regulated in the range 4.17–7.67 by continuously bubbling 1% CO2-enriched air into the cultures and by varying the source of nitrogen (NO, NH, or urea) in the growth medium, which, in turn, led to changes in culture alkalinity. Culture alkalinity and P were the sole determinants of pH. A pH-stat system, together with NO in the medium, was used to regulate the pH in the range 7.92–10.67. Maximum productivity, which occurred at pH 6.6, was dependent on N source only to the extent that culture alkalinity was a function of nitrogen uptake. The results demonstrate that the choice of N is a critical factor in controlling the pH of large-scale algal cultures. NH is a poor source of N because it leads to destruction of culture alkalinity and concomitant growth-inhibiting reductions in pH, whereas NO has an opposite effect, although pH is not so severely affected in this case. Urea is, by far, the most suitable N source for maximizing algal yield when it is supplied in combination with the proper amounts of HCO alkalinity in the growth medium and percent CO2 in the bubbled gas that will lead to an equilibrium pH near the optimum pH." @default.
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- W2068383786 date "1982-03-01" @default.
- W2068383786 modified "2023-09-23" @default.
- W2068383786 title "Effect of nitrogen-mediated changes in alkalinity on pH control and CO2 supply in intensive microalgal cultures" @default.
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- W2068383786 doi "https://doi.org/10.1002/bit.260240308" @default.
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