Model of the anaerobic metabolism of the biological phosphorus removal process: Stoichiometry and pH influence

Smolders, G.; Meij, Jan van der; Loosdrecht, Mark C.M. van; Heijnen, J. J.

doi:10.1002/bit.260430605

Cited by 749 publications

(580 citation statements)

References 11 publications

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“…In the anaerobic zone the lack of oxygen as a terminal electron acceptor results in an increase in the NADH level, inhibiting oxidative metabolism (such as the tricarboxylic acid cycle). The resultant increase in acetyl CoA levels stimulates polyhydroxybuterate (PHB) synthesis, while polyphosphate degradation is stimulated by the decrease in the ATP/ADP ratio in the absence of oxidative phosphorylation (Smolders et al, 1994a). In the aerobic zone, oxygen is utilised as final electron acceptor for the electron transport system by which the high NADH level is reduced.…”

Section: Introductionmentioning

confidence: 99%

Antibody recognition of an 18 kDa protein possibly involved in phosphate removal by activated sludge

et al. 2000

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Section: Introductionmentioning

confidence: 99%

Antibody recognition of an 18 kDa protein possibly involved in phosphate removal by activated sludge

et al. 2000

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“…Seed sludge was then sieved by 100-µm sieving instrument resulting average initial seed sludge was approximately 46 µm . Wastewater used in this research was synthetic wastewater [15]. …”

Section: A Microbial Seed and Wastewatermentioning

confidence: 99%

The Effect of Synthetic Cationic Polymer Addition on Nucleation of Anaerobic Granules under Different Organic Loading Rate

Hudayah¹,

Suraraksa²,

Chaiprasert³

2012

IJBBB

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Abstract-Nucleation phase with the addition of synthetic cationic polymer, polyacrylamide 8265 (MEM 8265), under different organic loading rate (OLR) was investigated. The results showed that the addition of MEM 8265 showed significant positive effects related to physico-chemical characteristics of microbial aggregates such as short nucleation time, higher size distribution of aggregates >100 µm, nuclei ratio and SVI value. The nucleation phase was achieved within 69 days. The nuclei size was 126 µm and nuclei ratio achieved 51% of total sludge. SVI was 60 ml.mg -1 SS. However, the activities of acidogenic bacteria (propionic acid-and butyric acid-degrading microorganisms) and methanogens were similar to control (without polymer addition).

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“…A pH auto-controller was used to keep pH at a pre-selected value by addition of 1 M HCl or 1 M NaOH. Oxygen uptake rates (OUR) were determined on line by a respirometer as described by Smolders et al [20] . DO and pH were continuously on-line monitored.…”

Section: Batch Experimentsmentioning

confidence: 99%

Determination of optimum operating conditions for production of polyhydroxybutyrate by activated sludge submitted to dynamic feeding regime

Liu

2009

Chin. Sci. Bull.

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Polyhydroxybutyrate (PHB) was produced by activated sludge in a two-stage process. In the first stage, the sludge with high storage potential was enriched in a sequencing batch reactor (SBR) operated by a dynamic feeding regime. The biosynthesis of PHB was sequentially accomplished in a batch reactor in the second stage. This article focused on the optimization of PHB content by evaluating the effects of three critical factors: Dissolved oxygen, pH and food-to-microorganism (F/M) ratio in the batch reactor. The results showed that the rate of substrate uptake, as well as the yield and content of PHB increased with the increase of dissolved oxygen concentration. The control of pH was not necessary under the weak alkaline condition for improvement of PHB content, except for the case in which the pH value was out of rang of 7.0 to 10.0. The enhanced F/M ratio favored PHB accumulation in the range of 1.0 to 4.5 C-mmol/C-mmol and the highest PHB content, 64%, was achieved at 4.5 C-mmol/C-mmol. When F/M ratio was enhanced to 6.0 C-mmol/C-mmol, the phenomenon of utilizing simultaneously intracellular PHB and external substrate by sludge was observed, which resulted in a sharp decrease of PHB content. The microscopic observation clearly confirmed that dynamic feeding regime was effective for selecting and enriching the sludge with a high storage potential.polyhydroxybutyrate, activated sludge, dynamic feeding regime, optimum operating conditions Conventional plastics have faced some severe problems, because of their persistency in the environment and non-biodegradability. Therefore, the biodegradable plastic has potentials in applications. Polyhydroxyalkanoates (PHAs) are the polyester of hydroxyalkanoates synthesized by numerous bacteria as intracellular carbon and energy storage compounds, and have similar mechanical properties to conventional plastics like polypropylene or polyethylene. Additionally, PHAs have the attractive features of being completely biodegradable, biocompatible, and produced from renewable sources. Polyhydroxybutyrate (PHB) is the most common and best characterized PHAs. For the economical production of PHAs, various bacterial strains, either wild-type or recombinant, and new fermentation strategies were developed with high content and productivity of PHAs [1,2]

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Model of the anaerobic metabolism of the biological phosphorus removal process: Stoichiometry and pH influence

Cited by 749 publications

References 11 publications

Antibody recognition of an 18 kDa protein possibly involved in phosphate removal by activated sludge

Antibody recognition of an 18 kDa protein possibly involved in phosphate removal by activated sludge

The Effect of Synthetic Cationic Polymer Addition on Nucleation of Anaerobic Granules under Different Organic Loading Rate

Determination of optimum operating conditions for production of polyhydroxybutyrate by activated sludge submitted to dynamic feeding regime

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