Marine microalgae Nannochloropsis oculata biomass harvesting using ultrafiltration in cross-flow mode

International Conference on Green Agro-industry and Bioeconomy 2017

农业科学;生物科学;经济学

Devianto, L.A.^1 ; Aprilia, D.N.^2 ; Indriani, D.W.^2 ; Sukarni, S.^3 ; Sumarlan, S.H.^4 ; Wibisono, Y.^2,5

Department of Environmental Engineering, Faculty of Agricultural Technology, Universitas Brawijaya, Malang, Indonesia^1

Department of Bioprocess Technology, Faculty of Agricultural Technology, Universitas Brawijaya, Malang, Indonesia^2

Department of Mechanical Engineering, State University of Malang, Malang, Indonesia^3

Department of Agricultural Engineering, Faculty of Agricultural Technology, Universitas Brawijaya, Malang, Indonesia^4

MILI Water Research Institute, Malang, Indonesia^5

关键词: Bioenergy sources;    Biomass harvesting;    Marine microalgae;    Microalgae cultivation;    Nannochloropsis oculata;    Recovery percentages;    Transmembrane pressures;    Ultra-filtration membranes;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/131/1/012042/pdf
DOI  :  10.1088/1755-1315/131/1/012042

来源: IOP

【 摘 要 】

Microalgae is a potential bioenergy source. It can grows rapidly, even it could be harvested within 7 days. Harvesting is an important part of microalgae cultivation due to the method used. It should be undamaging toward essential content of microalgae and should produces high yields of biomass. In this study, the harvesting of Nannochloropsis oculata was carried out using capillary ultrafiltration in cross flow mode. This study aims to test ultrafiltration membrane performance in Nannochloropsis oculata harvesting accompanied by Backwash and Non-Backwash modes and to analyse its total lipid content. The harvest was done under 1; 1.5; and 2 bar of trans membrane pressure. Some observed parameters were permeate flux, cell density, biomass recovery, microalgae's dry weight, yield, and total lipid content. The application of high pressure and backwashed treatment have boosted slurry production time which lead to microalgae's biomass abundance. The result showed that the best treatment of Nannochloropsis oculata harvesting using capillary ultrafiltration membrane in cross flow mode is under 2 bar of pressure with backwashed treatment. This is the fastest condition to produce slurry within 1800 s with the highest recovery percentage 79.50%, 16.05 × 106cell/ml of post-treatment cell density, 6.8 grams of biomass' dry weight, 22.66 % of yield, and 2.52 % of total lipid content.