Formation, application, and storage-reactivation of aerobic granular sludge: A review

Wan, Chunli; Li, Zhengwen; Liu, Xiang; Lin, Lin; Wu, Changyong

doi:10.1016/j.jenvman.2022.116302

Cited by 31 publications

(11 citation statements)

References 203 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Additionally, in the later stages of reactor operation (days 60-80), ~10% TN loss occurred in the aerobic zone. This further demonstrates that with the granulation of sludge, short-cut nitrification and denitrification and simultaneous nitrification-denitrification processes within the microenvironment of granular sludge contributed to the denitrification performance of the reactor, according to the microstructure of the granular sludge [31]. The decrease in the TN removal rate in the anaerobic zone was mainly due to the reduction in NO3 − -N carried to the anaerobic zone via the sludge's return, as the overall denitrification efficiency of the reaction system improved.…”

Section: Removal Patterns Of N and P In The Reaction Systemmentioning

confidence: 70%

Enhanced Simultaneous Nitrogen and Phosphorus Removal in a Continuous-Flow Granular Sludge System under Gradient-Controlled Hydraulic Loading

Zhao,

An,

Wan

et al. 2024

Water

View full text Add to dashboard Cite

The feasibility of the aerobic granulation of activated sludge was investigated in a continuous-flow anaerobic–anoxic–oxic system under gradient-controlled hydraulic loading on the surface of a cyclone separator. Concentrated domestic sewage was used. After 80 days of operation, 80% of activated sludge in the system was in the form of granular sludge with an average particle size of 373 μm. High removal efficiency was achieved for chemical oxygen demand (94.40%), NH4+-N (99.93%), total nitrogen (89.44%), and total phosphorus (96.92%). A batch study revealed that Pseudomonas (1.34%) and Dechloromonas (1.05%) as the main denitrifying phosphorus-accumulating organisms could efficiently remove phosphorus using nitrate as an electron acceptor, which improved the utilization efficiency of carbon sources and achieved simultaneous denitrification and phosphorus removal. Overall, the study demonstrates the feasibility of enhanced denitrification and phosphorus removal in a continuous-flow granular sludge system. The sludge system enables simultaneous nitrogen and phosphorus removal under low carbon-to-nitrogen ratios.

show abstract

Section: Removal Patterns Of N and P In The Reaction Systemmentioning

confidence: 70%

Enhanced Simultaneous Nitrogen and Phosphorus Removal in a Continuous-Flow Granular Sludge System under Gradient-Controlled Hydraulic Loading

Zhao,

An,

Wan

et al. 2024

Water

View full text Add to dashboard Cite

show abstract

“…EPS play a vital role in AGS formation, being tightly linked to microbial aggregation and biosorption ( Li and Yu, 2014 ; Wan et al, 2022 ). Figure 4 presents the impact of HM addition on the EPS content and fractions per layer.…”

Section: Resultsmentioning

confidence: 99%

Aerobic granular sludge for complex heavy metal-containing wastewater treatment: characterization, performance, and mechanisms analysis

Liu,

Shen,

et al. 2024

Front. Microbiol.

View full text Add to dashboard Cite

Complex heavy metal (HM)-containing wastewater discharges pose substantial risks to global water ecosystems and human health. Aerobic granular sludge (AGS) has attracted increased attention as an efficient and low-cost adsorbent in HM-containing wastewater treatment. Therefore, this study systematically evaluates the effect of Cu(II), Ni(II), and Cr(III) addition on the characteristics, performance and mechanism of AGS in complex HM-containing wastewater treatment process by means of fourier transform infrared spectroscopy, inductively coupled plasma spectrocopcy, confocal laser scanning microscopy, extracellular polymeric substances (EPS) fractions detection and scanning electron microscope-energy dispersive X-ray. The results showed that AGS efficiently eliminated Cu(II), Ni(II), and Cr(III) by the orchestrated mechanisms of ion exchange, three-layer EPS adsorption [soluble microbial products EPS (SMP-EPS), loosely bound EPS (LB-EPS), tightly bound EPS (TB-EPS)], and inner-sphere adsorption; notably, almost 100% of Ni(II) was removed. Three-layer EPS adsorption was the dominant mechanism through which the HM were removed, followed by ion exchange and inner-sphere adsorption. SMP-EPS and TB-EPS were identified as the key EPS fractions for adsorbing Cr(III) and Cu(II), respectively, while Ni(II) was adsorbed evenly on SMP-EPS, TB-EPS, and LB-EPS. Moreover, the rates at which the complex HM penetrated into the granule interior and their affinity for EPS followed the order Cu(II) > Ni(II) > Cr(III). Ultimately, addition of complex HM stimulated microorganisms to excrete massive phosphodiesterases (PDEs), leading to a pronounced decrease in cyclic diguanylate (c-di-GMP) levels, which subsequently suppressed EPS secretion due to the direct linkage between c-di-GMP and EPS. This study unveils the adaptability and removal mechanism of AGS in the treatment of complex HM-containing wastewater, which is expected to provide novel insights for addressing the challenges posed by intricate real wastewater scenarios.

show abstract

“…However, technologies to regulate microbial behaviors such as adhesion to the surface, secretion of extracellular polymeric substances, and built-up biofilm structures, for improving biofouling reduction, are still in their early stages. Recently, studies have reported the use of intermicrobial signaling materials as biofouling control strategies ( Shahid et al, 2020 ; Wan et al, 2022 ; Song et al, 2023 ). The quorum sensing (QS) system is a communication system involved in the generation of in vitro metabolites of microbial cells and communities.…”

Section: Introductionmentioning

confidence: 99%

Dispersive biofilm from membrane bioreactor strains: effects of diffusible signal factor addition and characterization by dispersion index

Song

Ryu

Jung³

et al. 2023

Front. Microbiol.

View full text Add to dashboard Cite

IntroductionBiofilm occurs ubiquitously in water system. Excessive biofilm formation deteriorates severely system performance in several water and wastewater treatment processes. Quorum sensing systems were controlled in this study with a signal compound cis-2-Decenoic acid (CDA) to regulate various functions of microbial communities, including motility, enzyme production, and extracellular polymeric substance (EPS) production in biofilm.MethodsThe addition of CDA to six strains extracted from membrane bioreactor sludge and the Pseudomonas aeruginosa PAO1 strain was examined for modulating biofilm development by regulating DSF expression.Results and discussionAs the CDA doses increased, optical density of the biofilm dispersion assay increased, and the decrease in EPS of the biofilm was obvious on membrane surfaces. The three-dimensional visual images and quantitative analyses of biofilm formation with CDA proved thinner, less massive, and more dispersive than those without; to evaluate its dispersive intensity, a dispersion index was proposed. This could compare the dispersive effects of CDA dosing to other biofilms or efficiencies of biofouling control practices such as backwashing or new cleaning methods.

show abstract

Formation, application, and storage-reactivation of aerobic granular sludge: A review

Cited by 31 publications

References 203 publications

Enhanced Simultaneous Nitrogen and Phosphorus Removal in a Continuous-Flow Granular Sludge System under Gradient-Controlled Hydraulic Loading

Enhanced Simultaneous Nitrogen and Phosphorus Removal in a Continuous-Flow Granular Sludge System under Gradient-Controlled Hydraulic Loading

Aerobic granular sludge for complex heavy metal-containing wastewater treatment: characterization, performance, and mechanisms analysis

Dispersive biofilm from membrane bioreactor strains: effects of diffusible signal factor addition and characterization by dispersion index

Contact Info

Product

Resources

About