Diameter control and stability maintenance of aerobic granular sludge in an A/O/A SBR

Zhang, Cuiya; Zhang, Hanmin; Yang, Fenglin

doi:10.1016/j.seppur.2015.06.010

Cited by 48 publications

(13 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3). One possible reason for this observation is that domestic wastewater with low COD/N ratios could reduce the growth rate of granules, and this finding is similar to that described in previous research [30]. In this study, the DO concentration needed in the GSBR system was about 60% lower than that of other GSBR systems [26][27]31].…”

Section: Richness and Diversity Of Bacteria Phylotypes Of Gsbrsupporting

confidence: 87%

Rapid Startup of Simultaneous Nitrogen and Phosphorus Removal (SNPR) Process and the Bacterial Community Dynamics in a GSBR

Xin¹,

Wang²

2019

Pol. J. Environ. Stud.

View full text Add to dashboard Cite

This study inoculated aerobic granular sludge (AGS) in a sequencing batch reactor (SBR) treatment for low carbon nitrogen (COD/N) ratio wastewater, and gradually reduced the DO concentration in order to achieve the rapid startup of the simultaneous nitrogen and phosphorous removal (SNPR) process. Meanwhile, the microbial community dynamics at different DO levels were analyzed by high-throughput sequencing. The removal efficiencies of total nitrogen (TN) and phosphorus (TP) were significantly affected as different dissolved oxygen (DO) concentrations (2.0,1.2 and 0.8 mg/L) in stages I, II and III, respectively. When DO concentration was reduced to 0.8mg/L (stage III), the SNPR process was successfully implemented and the removal efficiencies of TN and TP were up to 77.30% and 85.78%, respectively. A total of 40,983 effective 16S rRNA gene sequences were generated from four samples (1-4) that widely represented microbial community diversity. The dominant phyla transformed from Candidate_division_TM7 (the relative abundance of 68.08%) and proteobacteria (25.78%) to Firmicutes (47.57%) and proteobacteria (41.49%) when DO concentration was decreased from 2.0 mg/L (stage I) to 0.8 mg/L(stage III). Moreover, Kluyvera, Peptostreptococcaceae_incertae_ sedis, Clostridium_sensu_strict_1, Trichococcus, Denitratisoma, Clostridium_sensu_stricto_13 and Raoultell were the most abundant genus in the SNPR process. Among these communities, Clostridium_ sensu_strict_1, Clostridium_sensu_stricto_13 and Denitratisoma were considered the main organisms responsible for simultaneous nitrogen and phosphorus removal.

show abstract

Section: Richness and Diversity Of Bacteria Phylotypes Of Gsbrsupporting

confidence: 87%

Rapid Startup of Simultaneous Nitrogen and Phosphorus Removal (SNPR) Process and the Bacterial Community Dynamics in a GSBR

Xin¹,

Wang²

2019

Pol. J. Environ. Stud.

View full text Add to dashboard Cite

show abstract

“…The total nitrogen removal rate in the system was almost stable during the aerobiotic stage; while the ammonia content decreased gradually. Large amount of ammonia was likely converted into nitrate by nitrifiers and accumulated during aerobiotic stage, especially in activated sludge A 2 system under increased significantly under 35 • C ascribing to the increased metabolic activity of nitrifiers ( Figure 2) [27]. During the anoxic phase, the ammonia was continually removed with a rate comparable with that during the aerobiotic stage.…”

Section: The Degradation Effect Of the Activated Sludge Under Typicalmentioning

confidence: 96%

Metagenomic Insights into the Effects of Seasonal Temperature Variation on the Activities of Activated Sludge

Zhang

Zhou

et al. 2019

Microorganisms

View full text Add to dashboard Cite

It is well acknowledged that the activities of activated sludge (AS) are influenced by seasonal temperature variation. However, the underlying mechanisms remain largely unknown. Here, the activities of activated sludge under three simulated temperature variation trends were compared in lab-scale. The TN, HN3-H, and COD removal activities of activated sludge were improved as temperature elevated from 20 °C to 35 °C. While, the TN, HN3-H, COD and total phosphorus removal activities of activated sludge were inhibited as temperature declined from 20 °C to 5 °C. Both the extracellular polymer substances (EPS) composition (e.g., total amount, PS, PN and DNA) and sludge index of activated sludge were altered by simulated seasonal temperature variation. The variation of microbial community structures and the functional potentials of activated sludge were further explored by metagenomics. Proteobacteria, Actinobacteria, Acidobacteria and Bacteroidetes were the dominant phyla for each activated sludge sample under different temperatures. However, the predominant genera of activated sludge were significantly modulated by simulated temperature variation. The functional genes encoding enzymes for nitrogen metabolism in microorganisms were analyzed. The enzyme genes related to ammonification had the highest abundance despite the changing temperature, especially for gene encoding glutamine synthetase. With the temperature raising from 20 °C to 35 °C. The abundance of amoCAB genes encoding ammonia monooxygenase (EC:1.14.99.39) increased by 305.8%. Meanwhile, all the enzyme genes associate with denitrification were reduced. As the temperature declined from 20 °C to 5 °C, the abundance of enzyme genes related to nitrogen metabolism were raised except for carbamate kinase (EC:2.7.2.2), glutamate dehydrogenase (EC:1.4.1.3), glutamine synthetase (EC:6.3.1.2). Metagenomic data indicate that succession of the dominant genera in microbial community structure is, to some extent, beneficial to maintain the functional stability of activated sludge under the temperature variation within a certain temperature range. This study provides novel insights into the effects of seasonal temperature variation on the activities of activated sludge.

show abstract

“…In this sense, AGS systems have already been used to treat different troublesome wastewaters including from the pulp and paper industry, petrochemical, hypersaline, oily and sulfur-laden effluents, and applied in heavy metals removal, among others [6][7][8][9][10]. However, the performance and stability of the biomass aggregates is related to their structure and settling ability [11,12], and it is known that changes in the granules size can occur due to unstable process conditions [13]. More recently, it was found that AGS systems became less stable when high suspended (floccular) biomass fractions occur [14].…”

Section: Introductionmentioning

confidence: 99%

Sludge volume index and suspended solids estimation of mature aerobic granular sludge by quantitative image analysis and chemometric tools

Leal

Río

Mesquita

et al. 2020

Separation and Purification Technology

View full text Add to dashboard Cite

Aerobic granular sludge (AGS) is considered a promising technology for wastewater treatment. Furthermore, it is recognized that the stability of the process is related to the balanced growth of the suspended (floccular) and granular fractions. Therefore, the development of adequate techniques to monitor this balance is of interest. In this work the sludge volume index (SVI), volatile suspended solids (VSS) and total suspended solids (TSS) of mature AGS were successfully predicted with multilinear regression (MLR) models using data obtained from quantitative image analysis (QIA) of both fractions (suspended and granular). Relevant predictions were obtained for the SVI (R 2 of 0.975), granules TSS (R 2 of 0.985), flocs TSS (R 2 of 0.971), granules VSS (R 2 of 0.984) and flocs VSS (R 2 of 0.986). The estimation of the granular fraction ratio from the predicted TSS and VSS was also successful (R 2 of 0.985). The predictions help to avoid instability episodes of the AGS system, such as changes in biomass morphology, structure and settling properties.

show abstract

Diameter control and stability maintenance of aerobic granular sludge in an A/O/A SBR

Cited by 48 publications

References 58 publications

Rapid Startup of Simultaneous Nitrogen and Phosphorus Removal (SNPR) Process and the Bacterial Community Dynamics in a GSBR

Rapid Startup of Simultaneous Nitrogen and Phosphorus Removal (SNPR) Process and the Bacterial Community Dynamics in a GSBR

Metagenomic Insights into the Effects of Seasonal Temperature Variation on the Activities of Activated Sludge

Sludge volume index and suspended solids estimation of mature aerobic granular sludge by quantitative image analysis and chemometric tools

Contact Info

Product

Resources

About