Aerobic metabolism of mixed carbon sources in sequencing batch reactor under pulse and continuous feeding

Çığgın, Aslı Seyhan; Orhon, Derin; Capitani, Donatella; Miccheli, Alfredo; Puccetti, Caterina; Majone, Mauro

doi:10.1016/j.biortech.2012.10.109

Cited by 17 publications

(8 citation statements)

References 27 publications

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“…The corresponding MLSS and MLVSS levels were 2815 ± 260 and 1920 ± 180 mg/L, significantly lower as compared with fast feeding, confirming the effect of feeding regime on the magnitude of biomass maintained in the aerobic reactor. While this particular issue is beyond the scope of this study, preferential storage of the volatile fatty acid fractions of the substrate mixture during the fast feeding regime under aerobic conditions, and subsequent utilization of intracellular storage compounds for secondary growth coupled with a very low yield in the anaerobic reactor may be underlined for future studies (Ciggin et al, 2012(Ciggin et al, , 2013.…”

Section: Resultsmentioning

confidence: 98%

The effect of iron dosing on reducing waste activated sludge in the oxic-settling-anoxic process

Yağcı

Novak

Randall

et al. 2015

Bioresource Technology

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Section: Resultsmentioning

confidence: 98%

The effect of iron dosing on reducing waste activated sludge in the oxic-settling-anoxic process

Yağcı

Novak

Randall

et al. 2015

Bioresource Technology

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“…In SBR operation, the microbial culture is exposed to a sequence of ‘feast and famine’ conditions, which dictate the nature of metabolic reactions (i.e. substrate storage and the structure of the microbial community) . In an excellent review on this subject, Grady et al .…”

Section: Resultsmentioning

confidence: 99%

Which activated sludge configurations qualify for maximizing energy conservation – Why?

Orhon

Allı

Sözen

2018

J of Chemical Tech & Biotech

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BACKGROUND This paper aimed to provide a critical appraisal on maximizing sludge generation and energy conservation in high‐rate activated sludge (AS) configurations. The role of gravity settling and the positive attributes of high rate membrane bioreactors were emphasized. The appraisal covered data reported in the literature on 40 different experiments testing high‐rate AS configurations for sludge generation and energy conservation. RESULTS In systems with gravity settling, effluent chemical oxygen demand (COD) was higher than 125 mg L−1 in 60% of the experiments, with similarly high effluent soluble COD values. In high‐rate MBR systems, permeate COD fluctuated around 12–18 mgCOD L−1; in gravity systems, COD loss in the effluent was higher than 200 mg L−1 in 17 runs (65%) and 300 mg L−1 in 12 runs (46%). Corresponding observed yields were only 9–43%. Membrane systems consistently yielded much higher observed yields of 50–60%. CONCLUSION For energy recovery, AS systems require a major transition, reducing the sludge age to 1.0–2.0 d; only high‐rate systems are capable of maximizing energy conservation. This argument does not apply to the contact stabilization process, which is inherently unsuitable for energy recovery. A transition is also needed to replace gravity settling by membrane systems for effective control of particulate and soluble COD components. © 2018 Society of Chemical Industry

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“…However, the optimal PHB contents from batch fermentations were far below those of from flask fermentation. This may be because the DO was mostly engaged in the tricarboxylic acid cycle, which promoted the growth of microorganisms, rather than synthesizing acetyl coenzyme A, which contributed to PHB accumulation (Reddy and Mohan 2012;Ciggin et al 2013). Although the optimal productivity of 0.384 g l −1 h −1 was obtained in fed-batch fermentation, the low PHB content (46.6 %) would be against the extraction of PHB from C. daeguensis TAD1.…”

Section: Discussionmentioning

confidence: 97%

Improved productivity of poly (3-hydroxybutyrate) (PHB) in thermophilic Chelatococcus daeguensis TAD1 using glycerol as the growth substrate in a fed-batch culture

Cui

Huang

et al. 2015

Appl Microbiol Biotechnol

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A particularly successful polyhydroxyalkanoate (PHA) in industrial applications is poly (3-hydroxybutyrate) (PHB). However, one of the major obstacles for wider application of PHB is the cost of its production and purification. Therefore, it is desirable to discover a method for producing PHB in large quantities at a competitive price. Glycerol is a cheap and widely used carbon source that can be applied in PHB production process. There are numerous advantages to operating fermentation at elevated temperatures; only several thermophilic bacteria are able to accumulate PHB when glycerol is the growth substrate. Here, we report on the possibility of increasing PHB production at low cost using thermophilic Chelatococcus daeguensis TAD1 when glycerol is the growth substrate in a fed-batch culture. We found that (1) excess glycerol inhibited PHB accumulation and (2) organic nitrogen sources, such as tryptone and yeast extract, promoted the growth of C. daeguensis TAD1. In the batch fermentation experiments, we found that using glycerol at low concentrations as the sole carbon source, along with the addition of mixed nitrate (NH4Cl, tryptone, and yeast extract), stimulated PHB accumulation in C. daeguensis TAD1. The results showed that the PHB productivity decreased in the following order: two-stage fed-batch fermentation > fed-batch fermentation > batch fermentation. In optimized culture conditions, a PHB amount of 17.4 g l(-1) was obtained using a two-stage feeding regimen, leading to a productivity rate of 0.434 g l(-1) h(-1), which is the highest productivity rate reported for PHB to date. This high PHB biosynthetic productivity could decrease the total production cost, allowing for further development of industrial applications of PHB.

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Aerobic metabolism of mixed carbon sources in sequencing batch reactor under pulse and continuous feeding

Cited by 17 publications

References 27 publications

The effect of iron dosing on reducing waste activated sludge in the oxic-settling-anoxic process

The effect of iron dosing on reducing waste activated sludge in the oxic-settling-anoxic process

Which activated sludge configurations qualify for maximizing energy conservation – Why?

Improved productivity of poly (3-hydroxybutyrate) (PHB) in thermophilic Chelatococcus daeguensis TAD1 using glycerol as the growth substrate in a fed-batch culture

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