Nutrient removal and biodiesel feedstock potential of the green alga UHCC00027 grown in municipal wastewater under cold climate conditionsстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 17 октября 2017 г.
Аннотация:Integrating cultivation with wastewater treatment improves the economics of microalgal based biofuel production
and allows for the sustainable reuse of nitrogen (N) and phosphorus (P) from waste streams. Batchcultivation
of a locally isolated green microalga, UHCC00027, and an indigenous algal-bacterial consortium was
undertaken on screened municipal wastewater in 24 L pilot reactors. Evaluations of growth and of N and P
removal were performed at different Chemical Oxygen Demand (COD) levels and N:P ratios. Lipid accumulation
and fatty acid composition of the resulting biomass were also examined. Unique to the present study was the
evaluation of wastewater treatment performance under cold temperatures (7–13 °C) typical of a Nordic climate.
While temperature exerted little influence on heterotrophic COD removal, vigorous (temperature dependent)
growth of microalgae was important in the efficient removal of N and P, with the N:P ratio playing a central role.
The studied cultivation regime and organisms achieved regulatory N and P removal levels with a hydraulic
retention time (HRT) of 12 days. However, biodiesel properties of the resulting biomass did not meet international
standards due to a high proportion of polyunsaturated fatty acids. Possible workarounds for simultaneously
increasing nutrient removal efficiency, biomass productivity, and improving biomass suitability for
biodiesel under a Nordic climate are discussed.