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Sustainable Microalgae Cultivation for Biogas Production: A Technical and Economic Analysis

Ramos Alves, Frederico
Master thesis
Åpne
15131_FULLTEXT.pdf (Låst)
15131_COVER.pdf (Låst)
15131_ATTACHMENT.zip (Låst)
Permanent lenke
http://hdl.handle.net/11250/2614734
Utgivelsesdato
2016
Metadata
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  • Institutt for bygg- og miljøteknikk [2807]
Sammendrag
Microalgae cultivation using waste streams as nutrient source in industrial scale is an

unconventional, and so far untapped, process pathway to produce microalgae biomass. The main

advantage of this approach is the fact no resources are spent on nutrients, which make up for the

major part of the conventional production costs. The main limitation is that culture medium is directly

influenced by the available in-site waste streams, which limits the application of this to industrial

processes with nutrient-rich and toxin free waste streams. There is also a degree of limitation with

respect to specific nutrient concentration towards cultivation optimization. Optimization of biomass

productivity implies knowledge about the behavior of each specific microalgae strain towards

process parameters such as illumination, temperature, oxygen gas concentration in the culture

medium, nutrient availability, pH value, hydraulic retention time, mixing and heavy metal presence.

The use of the cultivated microalgae to produce methane through anaerobic digestion also put

emphasis on the specific chemical composition of microalgae.

This study was done in partnership with Biokraft AS and it integrated in the innovation projects

in business and industry COMPLETE. The purpose of this study is to investigate the effect of the

aforementioned parameters in microalgae cultivation and find out patterns to act as general guidelines

for process optimization. It also an objective of the this work to evaluate laboratory and pilot-scale

applications of conventional and wastewater-based microalgae cultivation towards the establishment

of an industrial-scale cultivation model, whose profitability under a set of conditions will be

calculated and evaluated.

The produced work highlights that there is interest in the scientific community about the

advantages of using wastewater-based microalgae cultivation systems, especially because of their

potential as a biological wastewater treatment with reduce energetic consumption. It was also found

that the cultivation technology that best suits the specific needs of this project is an internally

illuminated photobioreactor that will keep production steady and independent from the variable solar

irradiance in Norway. Furthermore, it was found that the most cost-effective solution for harvesting

the cultivated biomass is electrocoagulation.
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