Microalgal-bacterial aerobic granular sludge for old leachate treatment: Development, performance, and lipid production

Dhaneswara Ilmasari, Adhi Yuniarto, Chanlyda Khen, Laila Dina Amalia Purba, Zhongfang Lei, Ali Yuzir*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

A lab-scale photo bio sequencing batch reactor (PSBR) was used to develop microalgal-bacterial aerobic granular sludge (MB-AGS) for old leachate treatment by seeding activated sludge, while indigenous microalgae were allowed to grow naturally. Upon 100 days of experiment, mature MB-AGS was successfully developed with an average diameter of 2.5 ± 1.5 mm and excellent settling properties, with a settling velocity of 39 ± 24 m/h. The biochemical oxygen demand (BOD), chemical oxygen demand (COD), ammonia (NH4+-N), total nitrogen (TN), and total phosphorus (TP) removal efficiencies were 80 ± 14%, 95 ± 2%, 88 ± 14%, 56 ± 16%, and 57 ± 14%, respectively. The shift in microbial populations were also examined, in which the abundant EPSs producing bacteria in the system could be one of the reasons behind the successful transformation of activated sludge flocs to mature MB-AGS. Furthermore, lipid was able to be extracted from the MB-AGS, in which the lipid production was 9.35 ± 1.1 mg/g-SS, accounting 0.56 ± 0.07 mg/L.d of lipid productivity.

Original languageEnglish
Article number138053
JournalJournal of Cleaner Production
Volume417
DOIs
Publication statusPublished - 10 Sept 2023

Keywords

  • Landfill leachate
  • Microalgal-bacterial aerobic granular sludge
  • Microbial community
  • Nutrient removal
  • Resource recovery
  • Sequencing batch reactor

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