Short term uptake experiments and long term semicontinuous culture experiments were performed under the condition of phosphorus (P) limitation to estimate and compare the P uptake and growth kinetics of the microalga ...Short term uptake experiments and long term semicontinuous culture experiments were performed under the condition of phosphorus (P) limitation to estimate and compare the P uptake and growth kinetics of the microalga Tetraselmis subcordiformis and the macroalga Ulva pertusa. Two new parameters, the maximum specific uptake rate ( V sp m) and the maximal growth efficiency ( β ), are introduced to achieve uniformity for the comparison of nutrient uptake and growth efficiency between microalgae and macroalgae. T. subcordiformis possesses 3 times lower half saturation uptake constant, 4 times higher maximal growth rate and 20 times higher maximum specific uptake rate than U. pertusa, while U. pertusa possesses 4 times higher maximal growth efficiency than T. subcordiformis.展开更多
[Objective] The aim was to investigate the effect of stoichiometric variables in AQUASIM, a simulation tool for digestion process. [Method] The ADM1 was modified in AQUASIM based on the existing physical experimental ...[Objective] The aim was to investigate the effect of stoichiometric variables in AQUASIM, a simulation tool for digestion process. [Method] The ADM1 was modified in AQUASIM based on the existing physical experimental data. Then the stoichiometric variables were adjusted in AQUASIM to test the effects of decay rate, maximum uptake rate and yield of ethanol in the simulation results. [Result] The biomass decay rate of ethanol was 0.02 per day; the maximum uptake rate of ethanol was 228 kgCOD_S/kg COD_X per day and the yield of ethanol was 0.029 5 kg COD_X/kg COD_S in this case. [Conclusion] The larger biomass decay rate of ethanol causes less accumulation of ethanol in the anaerobic digestion model simu- lation. Maximum uptake rate shows little effort to this modeling in a certain range. Larger yield of ethanol will get larger peak values in the simulation results.展开更多
基金supported by the Project under Major State Basic Research of China(G1999012011).
文摘Short term uptake experiments and long term semicontinuous culture experiments were performed under the condition of phosphorus (P) limitation to estimate and compare the P uptake and growth kinetics of the microalga Tetraselmis subcordiformis and the macroalga Ulva pertusa. Two new parameters, the maximum specific uptake rate ( V sp m) and the maximal growth efficiency ( β ), are introduced to achieve uniformity for the comparison of nutrient uptake and growth efficiency between microalgae and macroalgae. T. subcordiformis possesses 3 times lower half saturation uptake constant, 4 times higher maximal growth rate and 20 times higher maximum specific uptake rate than U. pertusa, while U. pertusa possesses 4 times higher maximal growth efficiency than T. subcordiformis.
文摘[Objective] The aim was to investigate the effect of stoichiometric variables in AQUASIM, a simulation tool for digestion process. [Method] The ADM1 was modified in AQUASIM based on the existing physical experimental data. Then the stoichiometric variables were adjusted in AQUASIM to test the effects of decay rate, maximum uptake rate and yield of ethanol in the simulation results. [Result] The biomass decay rate of ethanol was 0.02 per day; the maximum uptake rate of ethanol was 228 kgCOD_S/kg COD_X per day and the yield of ethanol was 0.029 5 kg COD_X/kg COD_S in this case. [Conclusion] The larger biomass decay rate of ethanol causes less accumulation of ethanol in the anaerobic digestion model simu- lation. Maximum uptake rate shows little effort to this modeling in a certain range. Larger yield of ethanol will get larger peak values in the simulation results.
