Influence of culture medium recycling on the performance of Arthrospira platensis cultures

Cross-study analysis of factors affecting algae cultivation in recycled medium for biofuel production

“…Growth inhibition (or lack of inhibition) may be more strongly influenced by other factors (such as those presented in Section 3.4), and not some universal inhibitor that accumulates with each reuse. Even so, several studies observed declining growth performance with increasing medium reuses and/or organic matter accumulation [23,37,103], though these results are outweighed by other experiments in the regression. A limitation of this analysis, however, is that the experimental duration of each medium reuse is different across studies.…”

“…Of the studies that did measure organic compounds in recycled medium (including [15,17,22,23,25,26,37,38,52,61,69,86,89,97,103]), most measured polysaccharides, the most abundant algal exudate, and observed an accumulation [15,22,25,37]. Depraetere, et al [37] confirmed that although polysaccharides in recycled medium inhibited Arthrospira growth to some degree, there were other factors intensifying the inhibition. Hadj-Romdhane, et al [22] grew Chlorella vulgaris in continuous culture with medium recycling and found that while high molecular weight compounds (likely polysaccharides) first increased then decreased in concentration, small compounds (likely proteins) continued accumulating.…”

“…Studies that did measure algae composition collectively showed that effects of recycled medium on lipid accumulation are situation-specific, but protein content may decrease while carbohydrate content increases if algae are stressed (see [5,25,37,38,60,66,70,83,89,103,104]).…”

Recycling Nannochloropsis oceanica culture media and growth inhibitors characterization

“…The differences in the microalgal AFDWs between the fresh-and recycled media-grown cultures might indicate the presence of growth inhibitors in the recycled media, which presented inhibition that was dependent on the initial nitrogen concentrations. Depraetere et al [27] reported that the decline in the growth rate and the maximum quantum yield of the photosynthesis of Arthrospira platensis were accompanied by an accumulation of organic matters in the repeatedly recycled culture medium. Zhang et al [28] investigated the effects of the algae-derived organic matters on the growth of Scenedesmus sp.…”

Effectiveness of repeated usage of the modified Zarrouk culture medium for cultivation of Spirulina platensis

“…Как правило, спирулину выра щивают в среде Заррука, содержащей большое количество (16,8 г/л) NaHCO 3 [8]. Исследователи разных стран предпринимают попытки модифицировать среду Заррука с целью ее удешевления, а так же ведут работы по определению возможности повторного использования среды культивирования [9][10][11]. При этом зачастую для эффективного выращивания спирулины в новых условиях требуется усложнение технологического процесса, а получаемая биомасса не всегда имеет оптимальный биохимический состав.…”