Role of hydrocyclone separator on the formation and separation of aerobic granular sludge: Evaluating granulation efficiency and simulating hydrodynamic behavior

Guo, Du; Jiang, Xinye; Guo, Mingzhe; Zeng, Ming; Wu, Nan; Hao, Linlin; Wang, Chang

doi:10.1016/j.seppur.2021.120231

Cited by 16 publications

(8 citation statements)

References 36 publications

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“…One part of sludge mixed liquor exited from the outlet at the top of the hydrocyclone separator, and there was another outlet of sludge mixed liquor with a valve at the bottom of the hydrocyclone separator. Detailed research methods can be found in previous studies (Guo et al, 2022).…”

Section: Methodsmentioning

confidence: 99%

“…At present, Indense™ (Avila et al, 2021), DEMON® (Klein et al, 2012) and S‐Select® (Welling et al, 2015) were used to separate the activated sludge with different weights and sizes. Guo et al (2022) showed the application mechanism of hydrocyclone separator in AGS culture. Hydrocyclone provided the strong shear force to the improvement of the settleability of sludge.…”

Section: Introductionmentioning

confidence: 99%

“…At present, Indense™ (Avila et al, 2021), DEMON ® (Klein et al, 2012) and S-Select ® (Welling et al, 2015) were used to separate the activated sludge with different weights and sizes. Guo et al (2022) This study aims to test two methods to promote the formation of granular sludge. First, the hydraulic shear stress was created by using a hydrocyclone separator connected with a completely stirred tank reactor (CSTR) to form AGS, unlike the traditional SBR.…”

Section: Introductionmentioning

confidence: 99%

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Insights into function of hydrocyclone separator and modified volcanic rock coagulant on formation of aerobic granular sludge

Zhao

Guo

et al. 2022

Water & Environment J

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Hydrocyclone separator and novel coagulants were adopted to separately enhance the granulating process of aerobic granular sludge. For hydrocyclone separator, although there was no obvious large particle, it was feasible to improve the sludge sedimentation capacity, indicated by the sludge volume index. Moreover, the nitrogen removal performance was promoted by the separator with a nitrogen removal rate of 8.2 mg/(LÁh), nearly two times of system without a separator. Meanwhile, nitrogen-related microbial communities were stimulated, for example, Thauera and Nitrosomonas. Another method of coagulation by the modified volcanic rock promoted the sludge settling performance. The optimum coagulating conditions were the coagulant size of 100 μm with dosage of 6 g/L. The addition of polyacrylamide played a weak role in granulation. Overall, the role of hydrocyclone separator and modified volcanic rock coagulant belonged to the improvement of the settleability of sludge and the aggregation of sludge, respectively.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Insights into function of hydrocyclone separator and modified volcanic rock coagulant on formation of aerobic granular sludge

Zhao

Guo

et al. 2022

Water & Environment J

Self Cite

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“…However, in the AGS system, a short HRT can significantly reduce the nitrogen and phospho-rus removal efficiency of the reaction system. Other studies [8,9] have shown that a constant "selective pressure" cannot adequately adapt to the varying hydraulic load requirements throughout different stages of sludge granulation. Excessive "selective pressure" in the initial stages of granulation can lead to considerable losses of activated sludge, which are challenging to recover independently.…”

Section: Introductionmentioning

confidence: 99%

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

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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.

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“…In order to obtain the results required for exploration efficiently and accurately, computer numerical simulation technology has become a powerful means to simulate the separation performance and internal flow field properties of hydrocyclones [20][21][22][23][24][25][26][27]. Vysyaraju [28] used a modeling method of computational fluid dynamics (CFD), the Large Eddy Simulation wall of achievable k-ε and Revnolds Stress Model (RSM), and LES-Wale turbulence model was used for prediction.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Position of Overflow Pipe with Mixed Spiral Structures on the Separation Performance of Hydrocyclones

Liu

Jiang

et al. 2023

Separations

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Overflow pipes are important components of hydrocyclones. The overflow products can carry huge amounts of residual energy when being discharged. In order to take full advantage of the residual energy and enhance hydrocyclone separation performance, this research designed a novel hydrocyclone by adding static mixing units with spiral elements in the overflow pipe. This study performed numerical simulations to investigate the effects of the install position of the spiral structure on the separation performance and inner flow field of the hydrocyclone. It can be concluded that both tangential velocity and pressure are first enhanced and then reduced by the elevation of the spiral structure. When the spiral structure is installed 30 mm away from the overflow pipe bottom, because of the hindrance of spiral elements, the discharge of coarse particles with the overflow are fully decreased and the quality of overflow products are enhanced.

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Role of hydrocyclone separator on the formation and separation of aerobic granular sludge: Evaluating granulation efficiency and simulating hydrodynamic behavior

Cited by 16 publications

References 36 publications

Insights into function of hydrocyclone separator and modified volcanic rock coagulant on formation of aerobic granular sludge

Insights into function of hydrocyclone separator and modified volcanic rock coagulant on formation of aerobic granular sludge

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

Effect of the Position of Overflow Pipe with Mixed Spiral Structures on the Separation Performance of Hydrocyclones

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