The stability of aerobic granular sludge treating municipal sludge deep dewatering filtrate in a bench scale sequencing batch reactor

Long, Bei; Yang, Changzhu; Pu, Weihua; Yang, Jiakuan; Shi, Yafei; Wang, Jing; Jun, Bai; Zhou, Xuan-Yue; Jiang, Guo-sheng; Li, Chunyang; Liu, Fu-biao

doi:10.1016/j.biortech.2014.06.094

Cited by 13 publications

(4 citation statements)

References 32 publications

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“…However, the surface of the granule from R3 (Fig. c) was compact and smooth, and the microorganisms were tightly attached together on the surface with a mushroom‐like structure . This structure could contribute to the stability of the granular sludge .…”

Section: Resultsmentioning

confidence: 99%

Role of Layered Double Hydroxide in Improving the Stability of Aerobic Granular Sludge

Sun

Chen

Liu

et al. 2017

CLEAN Soil Air Water

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Activated carbon (AC), layered double hydroxide (LDH), and metal ions (MIs) were added to aerobic sequencing batch reactors (SBRs), respectively, to improve the stability of aerobic granular sludge (AGS). The results showed that the addition of AC, LDH, and MIs accelerated the sludge granulation. With the addition of LDH, the AGS was denser and more compact, and the protein and polysaccharide contents of the extracellular polymeric substance (EPS) extracted from AGS were higher. In addition, the removal efficiencies of COD and NH4+‐N in the reactor with LDH addition were higher than those with AC and MIs addition, respectively. These results indicate that the AGS cultivated with LDH addition was more stable and more efficient than those with the addition of AC and MIs. The stimulated EPS secretion, the bridging effect and the binding effect played important roles in improving the AGS stability.

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Section: Resultsmentioning

confidence: 99%

Role of Layered Double Hydroxide in Improving the Stability of Aerobic Granular Sludge

Sun

Chen

Liu

et al. 2017

CLEAN Soil Air Water

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“…Nonetheless, a readily biodegradable carbon source is needed to obtain biological phosphorus and nitrogen removal. Also, Long et al (2014) have inoculated a SBR (9 L working volume), treating synthetic wastewater, with a mature aerobic granular sludge. They added 1-3 g of sodium acetate at each cycle in order to obtain nitrogen removals above 90%.…”

Section: Municipal Wastewater Treatmentmentioning

confidence: 99%

Aerobic granular sludge reactors

Iaconi¹,

Baeten²,

Castro³

et al. 2017

Innovative Wastewater Treatment &Amp; Resource Recovery Technologies: Impacts on Energy, Economy and Environment

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Aerobic granular sludge (AGS) technology is one of the major developments in the field of wastewater treatment of the past fifteen years. Granular sludge is a particulate type of biofilm that displays significantly different metrics and physical-chemical characteristics compared to activated sludge flocs occurring in conventional wastewater treatment plants. AGS is defined as aggregates of microbial cells which do not coagulate under reduced hydrodynamic shear and which subsequently settle significantly faster than activated sludge flocs (de Kreuk et al. 2005).Aerobic granulation is a process of microbial cell-to-cell self-immobilization involving biological, physical, and chemical phenomena, which leads to densification of the aggregates. The process is activated by selective environmental pressures on microorganisms commonly found in wastewater treatment plants using an optimum 'window' of operating conditions (Lee et al. 2010).The existence of a dissolved oxygen (DO) gradient and redox profile within granules leads to a layered structure where nitrifying, denitrifying and facultative anaerobic organisms can coexist. Therefore, due to this structure, AGS can simultaneously remove chemical oxygen demand (COD), nitrogen and phosphorous from wastewater (Pronk et al. 2015a).AGS reactors have been extensively studied for treating a wide variety of industrial wastewater, toxic compounds and municipal wastewater thanks to their many advantages compared to the conventional activated sludge systems consisting in low foot-print, excellent biomass settleability, high and stable rates of metabolic activity, resilience to shocks and toxins due to the protection by layered structure, long biomass residence time, and the possibility for bioaugmentation. Although the high interest and the significant advantages of the aerobic granular bioreactors over the conventional technologies only a limited number of full scale applications have been reported so far after almost two decades from its first development. The overall aim of this chapter is therefore to analyze the granular sludge bioreactors in order to evaluate the maturity level of this technique and at the same time to identify the issues that have prevented or slowed its widespread application at full scale wastewater treatment plants.

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“…The granulation process of activated sludge in GSBRs was conducted in three stages of adaptation, granule fabrication, and granule size increase (Long et al., 2014). In the GSBR, the activated sludge is inoculated with a combination of sludge containing filamentous bacteria with a poor sedimentation.…”

Section: Introductionmentioning

confidence: 99%

“…Given the short settling time in the GSBR, lighter flocs are washed from the reactor and the sludge concentration decrease in the reactor, while the concentration of the suspended solids increasing in the output. For the granulation, bacteria are separately grown, and then the acceleration of cumulative growth is performed, consequently leading to the formation of flocs, which are subsequently converted into granules (Long et al., 2014).…”

Section: Introductionmentioning

confidence: 99%

The formation of aerobic granular sludge for the treatment of real landfill leachate using a granular sequencing batch reactor at a constant volume

Seid‐Mohammadi

Asgari

Rafiee

et al. 2022

Environmental Quality Mgmt

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Leachate generated in a landfill may not be treated by conventional biological treatment due to its nature and complexity. The process of forming aerobic granules in batch sequencing reactors having features such as; reducing the settling process time and saving energy consumption and high decomposition rate have been noticed by researchers. In the present study, the structure of sequencing batch reactors (SBRs) was evaluated for the formation of granules, which were subsequently utilized for the treatment of landfill leachate. The experiment was initiated by using the GSBR, containing 1200 ml with different apparatuses, to develop granular sludge, and synthetic wastewater was added to reinforcement. The selected parameters for the operational hydraulic retention time (HRT) of the wastewater (6‐h cycles) included feeding, idle, aeration, settling, and discharge. Furthermore, the controlled conditions were the dissolved oxygen (DO) range of 2–2.2 mg/L, temperature range of 20–23℃, and pH of 7.5–8.3. The chemical oxygen demand (COD), mixed liquor suspended solids (MLSS), and sludge volume index (SVI) daily were measured at the influent and effluent of GSBR reactor. The main properties of aerobic granular sludge were identified during the research procedures, and the remarkable settling and potent, high‐density microbial structure of the granules were confirmed. The mean size of the formulated granules was estimated at 7.46 ± 1.8 mm, and the volume of the biomass also increased from approximately 1607 to 4137 mg/L through the granulation process. Moreover, 98% of the influent chemical oxygen demand (COD) could be removed by the formulated granular sludge, and the final‐stage organic loading rate was estimated at 5.65 COD/m3/day. According to the results, GSBRs could be employed for the formulation of aerobic granular sludge for the treatment of landfill leachate.

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The stability of aerobic granular sludge treating municipal sludge deep dewatering filtrate in a bench scale sequencing batch reactor

Cited by 13 publications

References 32 publications

Role of Layered Double Hydroxide in Improving the Stability of Aerobic Granular Sludge

Role of Layered Double Hydroxide in Improving the Stability of Aerobic Granular Sludge

Aerobic granular sludge reactors

The formation of aerobic granular sludge for the treatment of real landfill leachate using a granular sequencing batch reactor at a constant volume

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