scholarly journals Removal of crystal violet from aqueous solutions using an aerobic granular sludge system

2021 ◽  
Vol 3 (1) ◽  
pp. 55-60
Author(s):  
Costel Bumbac ◽  
◽  
Elena Elisabeta Manea ◽  
Olga Tiron
Keyword(s):  
Activated Sludge ◽  
Respiration Rate ◽  
Crystal Violet ◽  
Treatment Cycle ◽  
Granular Sludge ◽  
Inhibitory Effect ◽  
Aerobic Granular Sludge ◽  
Specific Test ◽  
Conventional Activated Sludge ◽  
The Matrix

The paper presents a set of comparative tests to evaluate the inhibitory effect of crystal violet on the respiration rate of microorganisms in conventional activated sludge and aerobic granular sludge. The tests were performed in similar conditions with the only variable of the type of sludge tested. The results emphasized that the aerobic granular sludge is less susceptible to the toxicity induced by crystal violet. The concentration of crystal violet that inhibits by 50% (CE50) the respiration rate of sludge microorganisms was determined to be, for the specific test conditions, 22.39 mg/L for the conventional activated sludge and 33.88 mg/L for the aerobic granular sludge. The paper also assesses the biodegradability potential of crystal violet from aqueous solution, in the presence of sodium acetate as co-substrate in a lab-scale sequential biological reactor with aerobic granular sludge. The experiments showed that most of the crystal violet is being initially absorbed in the matrix of the granules during the first minutes and subsequently is being removed with efficiencies above 95% within a treatment cycle of 8 hours.

scholarly journals Removal of bacterial and viral indicator organisms in full-scale aerobic granular sludge and conventional activated sludge systems

2020 ◽  
Vol 6 ◽  
pp. 100040 ◽  
Author(s):  
Mary Luz Barrios-Hernández ◽  
Mario Pronk ◽  
Hector Garcia ◽  
Arne Boersma ◽  
Damir Brdjanovic ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Granular Sludge ◽  
Full Scale ◽  
Aerobic Granular Sludge ◽  
Indicator Organisms ◽  
Conventional Activated Sludge ◽  
Activated Sludge Systems

Simulation of Aerobic Granular Sludge Process Efficiency

2017 ◽  
Vol 68 (8) ◽  
pp. 1723-1725
Author(s):  
Elena Elisabeta Manea ◽  
Costel Bumbac ◽  
Olga Tiron ◽  
Razvan Laurentiu Dinu ◽  
Valeriu Robert Badescu
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Batch Reactor ◽  
Granular Sludge ◽  
Process Efficiency ◽  
Aerobic Granular Sludge ◽  
Organic Load ◽  
Batch Reactors ◽  
Conventional Activated Sludge ◽  
Pollutants Removal

Using aerobic granular sludge for wastewater treatment has multiple advantages compared to conventional activated sludge systems, most important being the ability of simultaneous removal of the pollutants responsible for eutrophication: organic load, compounds of nitrogen (NH4+; NO3-) and phosphorus (PO43-). The advantages are currently exploited for developing the next generation of wastewater treatment systems while the identified limitations are approached by experimental and theoretical researches worldwide. The aim of the study consists in evaluating the possibility of predicting the system�s response to different changes in the influent wastewater loadings. The paper presents simulations results backed up by experimental data for pollutants removal efficiencies evaluation for a sequential batch reactor (SBR) with aerobic granular sludge. The mathematical model is based on the activated sludge model no. 3, which was updated by considering the simultaneous biological nitrification (NH4+NO3) and denitrification (NO3-N2) processes, thus complying with the biochemical reactions occurring in aerobic granular sludge sequential batch reactors. The model developed was validated by the experimental results obtained on a laboratory scale SBR monitored for over a month.

scholarly journals Comparing the performance of aerobic granular sludge versus conventional activated sludge for microbial log removal and effluent quality: Implications for water reuse

2018 ◽  
Vol 145 ◽  
pp. 442-452 ◽  
Author(s):  
Benjamin J. Thwaites ◽  
Michael D. Short ◽  
Richard M. Stuetz ◽  
Petra J. Reeve ◽  
Juan-Pablo Alvarez Gaitan ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Water Reuse ◽  
Granular Sludge ◽  
Aerobic Granular Sludge ◽  
Effluent Quality ◽  
Conventional Activated Sludge

The Characteristics of the Aerobic Granular Sludge on Nitrogen and Phosphorus Removal Simultaneously

2012 ◽  
Vol 446-449 ◽  
pp. 2840-2843
Author(s):  
Jin Sheng Liu ◽  
Yong Jiong Ni ◽  
Gen Yuan Jia ◽  
Jun Li
Keyword(s):  
Activated Sludge ◽  
Phosphorus Removal ◽  
Operation Mode ◽  
Weight Ratio ◽  
Granular Sludge ◽  
Aerobic Granular Sludge ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Conventional Activated Sludge ◽  
Seed Sludge

By using the conventional activated sludge as seed sludge in SBR to cultivate the aerobic granular sludge system, the mechanism of nitrogen and phosphorus removal was explored. The results showed that the aerobic granular sludge system consisted of the heavy aerobic granular sludge and the light flocculent activated sludge was formed in the reactor after 15 days. The SVI of the aerobic granular sludge system was about 50ml/g～60ml/g, the MLSS was about 3000mg/L～4000mg/L steadily, and the weight ratio of granules in the total sludge was about 70%.The removal rates of NH4+-N, TN, and PO43-P in the anaerobic-aerobic operation mode were 80%～97%, 80%～97% and 70%～85%, respectively. It indicated that granules and flocs were beneficial nitrogen and phosphorus removal, respectively.

Settling behaviour of aerobic granular sludge

2007 ◽  
Vol 56 (7) ◽  
pp. 55-63 ◽  
Author(s):  
A. Nor Anuar ◽  
Z. Ujang ◽  
M.C.M. van Loosdrecht ◽  
M.K. de Kreuk
Keyword(s):  
Activated Sludge ◽  
Batch Reactor ◽  
High Capacity ◽  
Granular Sludge ◽  
Aerobic Granular Sludge ◽  
Mechanical Mixing ◽  
Sludge Flocs ◽  
Conventional Activated Sludge ◽  
Biomass Retention ◽  
Sludge Settling

Aerobic granular sludge (AGS) technology has been extensively studied recently to improve sludge settling and behaviour in activated sludge systems. The main advantage is that aerobic granular sludge (AGS) can settle very fast in a reactor or clarifier because AGS is compact and has strong structure. It also has good settleability and a high capacity for biomass retention. Several experimental works have been conducted in this study to observe the settling behaviours of AGS. The study thus has two aims: (1) to compare the settling profile of AGS with other sludge flocs and (2) to observe the influence of mechanical mixing and design of the reactor to the settleability of AGS. The first experimental outcome shows that AGS settles after less than 5 min in a depth of 0.4 m compared to other sludge flocs (from sequencing batch reactor, conventional activated sludge and extended aeration) which takes more than 30 min. This study also shows that the turbulence from the mixing mechanism and shear in the reactor provides an insignificant effect on the AGS settling velocity.

Textile wastewater treatment: Aerobic granular sludge vs activated sludge systems

2014 ◽  
Vol 54 ◽  
pp. 337-346 ◽  
Author(s):  
Adriana Maria Lotito ◽  
Marco De Sanctis ◽  
Claudio Di Iaconi ◽  
Giovanni Bergna
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Granular Sludge ◽  
Textile Wastewater ◽  
Aerobic Granular Sludge ◽  
Textile Wastewater Treatment ◽  
Activated Sludge Systems

Strength characteristics of aerobic granular sludge

2012 ◽  
Vol 65 (2) ◽  
pp. 309-316 ◽  
Author(s):  
A. Nor-Anuar ◽  
Z. Ujang ◽  
M. C. M. van Loosdrecht ◽  
M. K. de Kreuk ◽  
G. Olsson
Keyword(s):  
Granular Sludge ◽  
Aerobic Granular Sludge ◽  
Strength Analysis ◽  
Anaerobic Granular Sludge ◽  
Aerobic Granules ◽  
Sludge Flocs ◽  
Conventional Activated Sludge ◽  
Biomass Retention ◽  
Settling Characteristic ◽  
Fast Settling

Aerobic granular sludge has a number of advantages over conventional activated sludge flocs, such as cohesive and strong matrix, fast settling characteristic, high biomass retention and ability to withstand high organic loadings, all aspects leading towards a compact reactor system. Still there are very few studies on the strength of aerobic granules. A procedure that has been used previously for anaerobic granular sludge strength analysis was adapted and used in this study. A new coefficient was introduced, called a stability coefficient (S), to quantify the strength of the aerobic granules. Indicators were also developed based on the strength analysis results, in order to categorize aerobic granules into three levels of strength, i.e. very strong (very stable), strong (stable) and not strong (not stable). The results indicated that aerobic granules grown on acetate were stronger (high density: >150 g T SSL−1 and low S value: 5%) than granules developed on sewage as influent. A lower value of S indicates a higher stability of the granules.

The SBR and its biofilm application potentials

2004 ◽  
Vol 50 (10) ◽  
pp. 1-10 ◽  
Author(s):  
P.A. Wilderer ◽  
B.S. McSwain
Keyword(s):  
Activated Sludge ◽  
Batch Reactor ◽  
Granular Sludge ◽  
Aerobic Granular Sludge ◽  
Waste Streams ◽  
Sludge Flocs ◽  
Biofilm Reactors ◽  
Volatile Organic ◽  
High Level ◽  
Slow Growing

Twenty plus years of experience, innovation, and research in the field of biological wastewater treatment and biofilm applications lead to the conclusion that biofilms are in many cases more desirable in reactors than suspended activated sludge. Biofilm reactors can provide very long biomass residence times even when the hydraulic influent loading is low. This makes them particularly suitable when treatment requires slow growing organisms with poor biomass yield or when the wastewater concentration is too low to support growth of activated sludge flocs. Regardless of the settling characteristics of biological aggregates or the hydraulic influent loading the metabolic activity in the reactor can be maintained at a high level. This paper reviews the application of biofilms in sequencing batch reactor (SBR) systems to treat non-readily biodegradable substrates, volatile organic waste constituents, complex waste streams requiring co-metabolism, and particulate wastewaters. Recent research using the SBR to form aerobic granular sludge as a special application of biofilms is also discussed.

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