Pretreatment of pig manure liquid digestate for microalgae cultivation via innovative flocculation-biological contact oxidation approach

Jialiang Zhou, Y. Wu, Jiahao Pan, Yuanhui Zhang, Zhidan Liu, Haifeng Lu, Na Duan

Research output: Contribution to journalArticle

Abstract

Liquid digestate with high concentration of organic matter and suspended solids cannot be directly used for microalgae cultivation. This study employed an innovative integrated approach, combining flocculation and biological contact oxidation (F-BCO), as a pretreatment to create a suitable environment for microalgae growth. The laboratory and pilot-scale experiments were both performed to verify operational performance. In F-BCO pretreatment, chemical oxygen demand (COD), NH3-N, and total phosphorus (TP) were reduced 55.0%, 46.1%, and 74.9%, respectively at pilot-scale in steady-state phase. It is further determined that the COD and TP removal were primarily attributed to flocculation, and NH3-N removal was mainly due to oxidation process (70%). The pretreated biogas slurry (BS) can be directly used for Chlorella cultivation, reaching a maximum accumulated biomass concentration of 3.3 g/L. The F-BCO process demonstrated a promising potential for pretreating BS to be a culture media for microalgae cultivation.

Original languageEnglish (US)
Article number133720
JournalScience of the Total Environment
Volume694
DOIs
StatePublished - Dec 1 2019

Keywords

  • Biological contact oxidation
  • Flocculation
  • Microalgae cultivation
  • Pig manure liquid digestate
  • Pretreatment

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution

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