Utilization of Microalgae in Nutrient Recovery – Landfill Leachate and Effluents from a Biogas plant
Hoang, Duc Anh (2022)
2022
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:amk-202205067666
https://urn.fi/URN:NBN:fi:amk-202205067666
Tiivistelmä
Landfill leachate and digestate from biogas plants have a high concentration of both macronutrients and micronutrients, which favor the growth of microorganisms like microalgae. Microalgae-based wastewater treatments relied on the assimilation mechanism of organisms, in which nutrients were absorbed to construct microalgal cells. These wastewater treatment technologies have been studied since the 20th century, yet they were not widely available.
The objective of the thesis was to find out what has been found in previous studies by reviewing the literature, particularly growth factors and limitations of microalgae, and hence, provide a prospect of implementing microalgae-based wastewater treatments. In total, there were 14 articles that complied with the inclusion and exclusion criteria and matched the thesis context.
The articles demonstrated that on the one hand, microalgae-based treatments were promising alternatives due to the high removal rate and efficiency and the cultivation of microalgae-produced microalgal biomass, which is highly valued. On the other hand, microalgae cultivation has faced numerous challenges, such as light distribution, high nutrients concentration, costly pretreatments, and low biomass productivity. The results showed that the development of microalgae technology was not ready to be implemented in full-size remediation plants. Several solutions were suggested, including co-cultivation between microalgae strains or between microalgae and bacteria, diluting the wastewaters into other types of wastewaters, as well as proposing an innovative photobioreactor.
The objective of the thesis was to find out what has been found in previous studies by reviewing the literature, particularly growth factors and limitations of microalgae, and hence, provide a prospect of implementing microalgae-based wastewater treatments. In total, there were 14 articles that complied with the inclusion and exclusion criteria and matched the thesis context.
The articles demonstrated that on the one hand, microalgae-based treatments were promising alternatives due to the high removal rate and efficiency and the cultivation of microalgae-produced microalgal biomass, which is highly valued. On the other hand, microalgae cultivation has faced numerous challenges, such as light distribution, high nutrients concentration, costly pretreatments, and low biomass productivity. The results showed that the development of microalgae technology was not ready to be implemented in full-size remediation plants. Several solutions were suggested, including co-cultivation between microalgae strains or between microalgae and bacteria, diluting the wastewaters into other types of wastewaters, as well as proposing an innovative photobioreactor.