Denitrification with endogenous carbon source at low C/N and its effect on P(3HB) accumulation

Bernat, Katarzyna; Wojnowska‐Baryła, Irena; Dobrzynska, A.

doi:10.1016/j.biortech.2007.05.008

Cited by 63 publications

(24 citation statements)

References 21 publications

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“…When the first 2 h are considered, most of the COD was utilized with a COD/NOxNreduced ratio of 7.1 (see Tab. 3), which perfectly matches the ratio obtained for the feast conditions for Culture A. This finding is supported by the results of Beun et al [22] and Bernat et al [37] where PHB formation was measured. Beun et al [22] have also reported that substrate was stored as PHB under feast conditions and the stored substrate was not efficiently used for denitrification.…”

Section: Nur Tests For Different Enrichment Cultures Under Substrate-supporting

confidence: 90%

Effects of Different Carbon Sources on Denitrification Efficiency Associated with Culture Adaptation and C/N Ratio

Güven¹

2009

CLEAN Soil Air Water

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Stringent effluent limitations for nitrogen necessitate an accurate interpretation of the design and operation conditions of biological nitrogen removal systems. In this study, the effects of the nature of the organic substrate on biomass adaptation and response to different C/N ratios in terms of denitrification efficiency were investigated. A relatively high chemical oxygen demand (COD) utilized /NO x -N reduced ratio of 8.1 was obtained when an excess amount of readily biodegradable carbon was supplied, which is suggested as the conversion of substrate surplus into storage polymers. An anoxic yield of 0.64 g cell COD/g COD for a four-compound substrate mixture (acetate, propionate, ethanol and glucose), 0.63 g cell COD/g COD for a two-compound substrate mixture (acetate and propionate), and 0.5 g cell COD/g COD for methanol were calculated. Fluorescence in situ hybridization analysis showed that the b-subclass of proteobacteria was dominant in the seed and in cultures adapted to both the fourcompound and the two-compound substrate mixture, whereas in the methanoladapted culture significant amounts of b-proteobacteria were detected. The biocommunity composition, the type of organic compound and the COD/NO 3 -N ratio strongly influence the nitrate reduction and carbon utilization profiles. Methanol has been shown to select for a denitrifying population consisting of Paracoccus and Hyphomicrobium vulgare genera, when used as only external carbon source.

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Section: Nur Tests For Different Enrichment Cultures Under Substrate-supporting

confidence: 90%

Effects of Different Carbon Sources on Denitrification Efficiency Associated with Culture Adaptation and C/N Ratio

Güven¹

2009

CLEAN Soil Air Water

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“…used a 12-h cycle to remove TC with filling, aerobic, settling, and decant phases of 10 min, 11 h, 45 min, and 5 min cycle times, respectively[15]. In another study,Dosta et al (2007) treated reject water from a mesophilic anaerobic digester with a 8-h total cycle time with the following steps:…”

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confidence: 99%

“…Third et al (2005) used 9.67-h cycle time for filtered synthetic wastewater with fill, aerobic, anoxic, settle, and decant phases of 3 h, 4 h, 2 h, 20 min, and 20 min, respectively[14] Bernat et al (2008). used a 12-h cycle to remove TC with filling, aerobic, settling, and decant phases of 10 min, 11 h, 45 min, and 5 min cycle times, respectively[15].…”

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confidence: 99%

Sequence optimization in a sequencing batch reactor for biological nutrient removal from domestic wastewater

Debik

Manav

2009

Bioprocess Biosyst Eng

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The purpose of this work was to determine optimum sequence retention times for nutrient removal with low-cost using very short aeration time in an SBR treating domestic wastewater. During the study, four different CYCLEs were evaluated, with the highest removal efficiencies recorded for the CYCLE with fill, anaerobic, aerobic1, anoxic, aerobic2, settle, and decant sequences operated at retention times of 0.5, 2, 2, 1, 0.75, 1, and 0.5 h, respectively. For this CYCLE, the removal efficiencies of chemical oxygen demand (COD), total Kjeldahl nitrogen (TKN), ammonia nitrogen (NH(3)-N), total phosphorus (TP), and ortho-phosphate (PO(4)-P) were found, on average, to be 91, 78, 85, 87, and 83%, respectively. The optimum sequence retention time was determined via the analysis of variance (ANOVA) using the Matlab software (Mathworks Inc.). The data indicated that the total time of the aerobic sequences was shorter than those of previous studies for similar level of removal efficiencies in all parameters including N and P.

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“…With acetate, poly (3-hydroxybutyrate) (PHB) is synthesized as the major form, while with propionate, poly (3-hydroxyvalerate) (PHV) and poly (3-hydroxy-2-methylvalerate) (PH2MV) are produced. It has been reported that PHB can be used as an endogenous carbon source for denitrification when all external carbon sources are depleted (Bernat et al, 2008;Wu et al, 2010), while some work suggest that its ability to support denitrification is very limited (Qin et al, 2005). Moreover, post-anoxic denitrification in EBPR system is thought to be driven predominantly by glycogen as electron donor, although PHA can also be used Winkler et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…However, this approach is not suitable for N removal system when combined with enhanced biological phosphorous removal (EBPR) because the addition of carbon substrates to the anoxic tank may promote phosphorus (P) release (Kuba et al, 1994) from P accumulating organisms (PAO) and reduce the total P removal capacity of the system. Two main storage organic carbon compounds namely polysaccharides (e.g., glycogen) and polyhydroxyalkanoates (PHA) (Bernat et al, 2008), play important roles in the activated sludge process. For example, in EBPR processes the composition of the PHA stored in the biomass changes according to which carbon sources are present in wastewater (Oehmen et al, 2007a).…”

Section: Introductionmentioning

confidence: 99%

Effect of Endogenous Carbon Source on Biological Denitrification Rate

Mikami

Nittami

Kurisu

2013

J. of Wat. ^|^ Envir. Tech.

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Post-anoxic denifitrication process can remove nitrogen from wastewater at a lower cost than pre-anoxic denitrification process since the nitrified water is not circulated during this process unless exogenous carbon addition is required. However, the denitrification rate is generally lower than that of a pre-anoxic process because endogenous carbon sources within the denitrifying bacteria are used as electron donors. The objective of this study was to develop a better understanding of this endogenous denitrification rate. A sequencing batch reactor fed with propionate was operated under variable anaerobic-aerobic conditions for 26 days to allow the biomass to accumulate polyhydroxyalkanoate (PHA) and glycogen stores. Sludge samples were collected from the reactor periodically, and nitrate removal rates were measured in the absence of any external carbon sources. Nitrate reduction rates ranged from 1.20 to 2.74 mgN/gMLSS/h. Meanwhile, PHA consumption (1.04 -8.01 mgC/gMLSS/h) and glycogen synthesis (0 -4.74 mgC/gMLSS/h) and consumption (0 -1.54 mgC/gMLSS/h) were observed. The PHA consumption correlated positively with the nitrate reduction rate. Furthermore, glycogen consumption seemed to reduce both PHA consumption and nitrate reduction.

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Denitrification with endogenous carbon source at low C/N and its effect on P(3HB) accumulation

Cited by 63 publications

References 21 publications

Effects of Different Carbon Sources on Denitrification Efficiency Associated with Culture Adaptation and C/N Ratio

Effects of Different Carbon Sources on Denitrification Efficiency Associated with Culture Adaptation and C/N Ratio

Sequence optimization in a sequencing batch reactor for biological nutrient removal from domestic wastewater

Effect of Endogenous Carbon Source on Biological Denitrification Rate

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