Modelling shortcut nitrogen removal from wastewater using an algal-bacterial consortium

Larissa T. Arashiro, Angelica M. Rada-Ariza, Meng Wang, Peter Van Der Steen, Sarina J. Ergas

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

A shortcut nitrogen removal process was investigated for treatment of high ammonium strength wastewater using an algal-bacterial consortium in photo-sequencing batch reactors (PSBRs). In this process, algae provide oxygen for nitritation during the light period, while denitritation takes place during the dark (anoxic) period, reducing overall energy and chemical requirements. Two PSBRs were operated at different solids retention times (SRTs) and fed with a high ammonium concentration wastewater (264 mg NH4+-N L-1), with a '12 hour on, 12 hour off' light cycle, and an average surface light intensity of 84 μmol m-2 s-1. High total inorganic nitrogen removal efficiencies (∼95%) and good biomass settleability (sludge volume index 53-58 mL g-1) were observed in both PSBRs. Higher biomass density was observed at higher SRT, resulting in greater light attenuation and less oxygen production. A mathematical model was developed to describe the algal-bacterial interactions, which was based on Activated Sludge Model No. 3, modified to include algal processes. Model predictions fit the experimental data well. This research also proposes an innovative holistic approach to water and energy recovery. Wastewater can be effectively treated in an anaerobic digester, generating energy from biogas, and later post-treated using an algal-bacterial PSBR, which produces biomass for additional biogas production by co-digestion.

Original languageEnglish (US)
Pages (from-to)782-792
Number of pages11
JournalWater Science and Technology
Volume75
Issue number4
DOIs
StatePublished - Feb 1 2017

Fingerprint

Nitrogen removal
Batch reactors
Wastewater
wastewater
Biomass
nitrogen
Biogas
biogas
modeling
biomass
ammonium
light attenuation
oxygen
Oxygen
holistic approach
inorganic nitrogen
Algae
light intensity
activated sludge
energy

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Water Science and Technology

Cite this

Arashiro, Larissa T. ; Rada-Ariza, Angelica M. ; Wang, Meng ; Van Der Steen, Peter ; Ergas, Sarina J. / Modelling shortcut nitrogen removal from wastewater using an algal-bacterial consortium. In: Water Science and Technology. 2017 ; Vol. 75, No. 4. pp. 782-792.
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Modelling shortcut nitrogen removal from wastewater using an algal-bacterial consortium. / Arashiro, Larissa T.; Rada-Ariza, Angelica M.; Wang, Meng; Van Der Steen, Peter; Ergas, Sarina J.

In: Water Science and Technology, Vol. 75, No. 4, 01.02.2017, p. 782-792.

Research output: Contribution to journalArticle

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