Highly efficient carbon assimilation and nitrogen/phosphorus removal facilitated by photosynthetic O2 from algal-bacterial aerobic granular sludge under controlled DO/pH operation

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Zejiao Li
  • Jixiang Wang
  • Jialin Liu
  • Xingyu Chen
  • Zhongfang Lei
  • Tian Yuan
  • Kazuya Shimizu
  • Zhenya Zhang
  • Yuemei Lin
  • Yasuhisa Adachi
  • Mark C.M. van Loosdrecht

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number120025
Journal / PublicationWater Research
Volume238
Online published1 May 2023
Publication statusPublished - 30 Jun 2023

Abstract

Reducing CO2 emission and energy consumption is crucial for the sustainable management of wastewater treatment plants (WWTPs). In this study, an algal-bacterial aerobic granular sludge (AGS) system was developed for efficient carbon (C) assimilation and nitrogen (N)/phosphorus (P) removal without the need for mechanical aeration. The photosynthetic O2 production by phototrophic organisms maintained the dissolved oxygen (DO) level at 3-4 mg/L in the bulk liquid, and an LED light control system reduced 10–30% of light energy consumption. Results showed that the biomass assimilated 52% of input dissolved total carbon (DTC), and the produced O2 simultaneously facilitated aerobic nitrification and P uptake with the coexisting phototrophs serving as a C fixer and O2 supplier. This resulted in a stably high total N removal of 81 ± 7% and an N assimilation rate of 7.55 mg/(g-MLVSS∙d) with enhanced microbial assimilation and simultaneous nitrification/denitrification. Good P removal of 92–98% was maintained during the test period at a molar ∆P/∆C ratio of 0.36 ± 0.03 and high P release and uptake rates of 10.84 ± 0.41 and 7.18 ± 0.24 mg/(g- MLVSS∙h), respectively. Photosynthetic O2 was more advantageous for N and P removal than mechanical aeration. This proposed system can contribute to a better design and sustainable operation of WWTPs using algal-bacterial AGS. © 2023 Elsevier Ltd.

Research Area(s)

  • Algal-bacterial aerobic granular sludge, Carbon fixation, Nitrogen assimilation, Photosynthetic oxygen, Simultaneous nitrogen and phosphorus removal

Citation Format(s)

Highly efficient carbon assimilation and nitrogen/phosphorus removal facilitated by photosynthetic O2 from algal-bacterial aerobic granular sludge under controlled DO/pH operation. / Li, Zejiao; Wang, Jixiang; Liu, Jialin et al.
In: Water Research, Vol. 238, 120025, 30.06.2023.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review