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

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 environme...

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Bibliographic Details
Published in:The Science of the total environment 2019-12, Vol.694, p.133720-133720, Article 133720
Main Authors: Zhou, Jialiang, Wu, Yiran, Pan, Jiahao, Zhang, Yuanhui, Liu, Zhidan, Lu, Haifeng, Duan, Na
Format: Article
Language:English
Subjects:
Animals
Biofuels
Biological contact oxidation
Biological Oxygen Demand Analysis
Biomass
Flocculation
Manure
Microalgae
Microalgae cultivation
Phosphorus
Pig manure liquid digestate
Pretreatment
Swine
Waste Disposal, Fluid - methods
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Summary: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. [Display omitted] •Flocculation-biological contact oxidation approach was applied to pretreat digestate.•Pilot-scale reactor removes 55% COD, 46% NH3-N and 75% TP, respectively.•The pretreated digestate can be directly used for Chlorella cultivation.•The maximum accumulated biomass can reach 3.3 g/L in 15 days.
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2019.133720