Low energy resonance vibration submerged membrane system for microalgae harvesting: Performance and feasibility

Choongsik Min, Jung Eun Kim, Ho Kyong Shon, Seung Hyun Kim

Research output: Contribution to journalArticlepeer-review

4 Citations (SciVal)

Abstract

This study investigated an energy-efficient harvesting method to collect microalgae of Chlorella Vulgaris (C. vulgaris). The method proposed in the current study was a combination of a resonance vibration submerged membrane (RVSM) system and centrifugation. The result showed that the RVSM system was able to concentrate the C. vulgaris solution by 17 times (0.61 g·L−1 to 10.4 g·L−1) without chemical cleaning during filtration with intermittent relaxation (i.e., filtration for 9 min and relaxation for 1 min) at a flux of 40 LMH (L·m−2·h−1) until the transmembrane pressure (TMP) reached 70 kPa. In addition, extracellular polymeric substances such as polysaccharides and protein were found mainly responsible for membrane fouling during the operation of concentrating C. vulgaris solution. Integrating the RVSM system with the centrifugation process required the total specific energy consumption of 0.56 kWh·m−3 (0.09 kWh·m−3 for the RVSM and 0.47 kWh·m−3 for the centrifugation). This study demonstrated the combination of the RVSM system and centrifugation to be a feasible C. vulgaris harvesting method by showing lower energy consumption than other conventional processes.

Original languageEnglish
Article number115895
JournalDesalination
Volume539
Early online date2 Jul 2022
DOIs
Publication statusPublished - 1 Oct 2022

Bibliographical note

Funding Information:
This research was sponsored by the National Research Foundation of Korea (NRF) grant funded by the Ministry of Education, Science and Technology (MEST) of the Korea government (No. 2017R1A2B4008530 ). The research reported in this paper was supported by the Australian Research Council (ARC) Industrial Transformation Research Hub on Nutrients in a Circular Economy (NiCE) ( IH210100001 ).

Keywords

  • Energy saving
  • Fouling mitigation
  • Intermittent relaxation
  • Microalgae harvesting
  • Resonance vibration system

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • General Materials Science
  • Water Science and Technology
  • Mechanical Engineering

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