Another important factor to be considered during cultivation
of microalgae on waste effluents is the dilution. Ref.
, reported that the dilution of the digested waste is needed
for the growth of Arthrospira, regarding the ammonia toxicity,
which is certainly the major factor explaining the need for considerable
dilution of the waste. In this study, using larger effluent
concentrations, observed in 7th run and 8th runs, the
control of the pH through the sodium bicarbonate buffer is necessary due to the fact that the wastewater causes a decrease
of the pH in the medium, making the micro alga growth unfeasible.
It can be predicted that the low effluent concentration
does not cause pH variations that limit the growth of the micro
alga, thus the buffer effect of the bicarbonate is necessary. The
improvement in cellular growth observed in 2nd, 4th and 6th
runs may be attributed to the higher effluent concentration,
which contains ingredients that support the alga growth. In
this respect, reported that Chlorella vulgaris grows very
well in the raw confectionery effluent. He added that the alga
utilizes sugar present in the effluent. The statistical analyses
suggested that WE exerted significant negative influences in the answers of algal contents of proteins, lipids and carbohydrates
(p > 0.01). But it has a significant positive influence
on chlorophyll (p > 0.01). However, no significant effect on
the response of algal carotenes has been reported (p > 0.05).
Likewise, found that the effluent from an anaerobic
sludge blanket from a pig farm was a suitable medium for the growth of A. platensis, obtaining an enriched biomass with
up to 57% protein and employing 20% of this effluent in the
culture media. Moreover, cultivated the microalga
Scenedesmus sp. on swine effluent wastewater diluted 1/10 up
on the addition to the culture.
Another important factor to be considered during cultivationof microalgae on waste effluents is the dilution. Ref., reported that the dilution of the digested waste is neededfor the growth of Arthrospira, regarding the ammonia toxicity,which is certainly the major factor explaining the need for considerabledilution of the waste. In this study, using larger effluentconcentrations, observed in 7th run and 8th runs, thecontrol of the pH through the sodium bicarbonate buffer is necessary due to the fact that the wastewater causes a decreaseof the pH in the medium, making the micro alga growth unfeasible.It can be predicted that the low effluent concentrationdoes not cause pH variations that limit the growth of the microalga, thus the buffer effect of the bicarbonate is necessary. Theimprovement in cellular growth observed in 2nd, 4th and 6thruns may be attributed to the higher effluent concentration,which contains ingredients that support the alga growth. Inthis respect, reported that Chlorella vulgaris grows verywell in the raw confectionery effluent. He added that the algautilizes sugar present in the effluent. The statistical analysessuggested that WE exerted significant negative influences in the answers of algal contents of proteins, lipids and carbohydrates(p > 0.01). But it has a significant positive influenceon chlorophyll (p > 0.01). However, no significant effect onthe response of algal carotenes has been reported (p > 0.05).Likewise, found that the effluent from an anaerobicsludge blanket from a pig farm was a suitable medium for the growth of A. platensis, obtaining an enriched biomass withup to 57% protein and employing 20% of this effluent in theculture media. Moreover, cultivated the microalgaScenedesmus sp. on swine effluent wastewater diluted 1/10 upon the addition to the culture.
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