The effect of volatile fatty acids on enhanced biological phosphorus removal and population structure in anaerobic/aerobic sequencing batch reactors

Randall, Andrew A.; Benefield, Larry D.; Hill, William E.; Nicol, Jean-Paul; Boman, Gerald K.; Shuh-Ren, Jing

doi:10.2166/wst.1997.0035

Cited by 30 publications

(18 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…1,2 The determinations of FA and AA are important for quality control in food and beverage manufactures. These acids are also important as intermediates for several compounds.…”

Section: Introductionmentioning

confidence: 99%

Determination of Aqueous Formic and Acetic Acids by Purge-and-Trap Analysis with a Needle-Type Extraction Device and Gas Chromatography Barrier Discharge Ionization Detector

et al. 2018

View full text Add to dashboard Cite

A purge-and-trap method using a needle-type extraction device and a gas chromatography-barrier discharge ionization detector for the analysis of formic (FA) and acetic acids (AA) in aqueous samples is presented. An activated carbon-based adsorbent, Carboxen 1000, was employed as the extraction medium for the needle-type extraction device. The sampling time was 5 min for collecting headspace gas in a glass vial, including 10 mL of an aqueous sample. The detection limits for FA and AA with a headspace sampling volume of 100 mL were 3.3 and 2.0 mg L -1 , respectively. Since the proposed method was based on purge-and-trap collection, it was suitable for the determination of aqueous FA and AA in complex matrices with simple and rapid sample preparation steps. The proposed method was applied to the determination of FA and AA in fruit juice samples and FA generated by the electrochemical reduction of carbon dioxide.

show abstract

“…1,2 The determinations of FA and AA are important for quality control in food and beverage manufactures. These acids are also important as intermediates for several compounds.…”

Section: Introductionmentioning

confidence: 99%

Determination of Aqueous Formic and Acetic Acids by Purge-and-Trap Analysis with a Needle-Type Extraction Device and Gas Chromatography Barrier Discharge Ionization Detector

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Brdjanovic et al [8] found that phosphorus release was stopped when glycogen was depleted. Randall et al [22] observed that the active sludge would have no ability of phosphorus removal if HAc was fed excessively and continuously. Therefore, the interruption of anaerobic HAc uptake and release of phosphorus would occur when the glycogen in the PAOs was exhausted.…”

Section: Character Of the Variation Of Each Componentmentioning

confidence: 99%

Kinetic analysis of anaerobic phosphorus release during biological phosphorus removal process

Luo

Dou

Liu

2007

Front.Environ.Sci.Eng.China

View full text Add to dashboard Cite

Enhanced biological phosphorus removal (EBPR) is a commonly used and sustainable method for phosphorus removal from wastewater. Poly-β-hydroxybutyrate (PHB), polyphosphate, and glycogen are three kinds of intracellular storage polymers in phosphorus accumulation organisms. The variation of these polymers under different conditions has an apparent influence on anaerobic phosphorus release, which is very important for controlling the performance of EBPR. To obtain the mechanism and kinetic character of anaerobic phosphorus release, a series of batch experiments were performed using the excessively aerated sludge from the aerobic unit of the biological phosphorus removal system in this study. The results showed that the volatile suspended solid (VSS) had an increasing trend, while the mixed liquid suspended sludge (MLSS) and ashes were reduced during the anaerobic phosphorus release process. The interruption of anaerobic HAc-uptake and phosphorus-release occurs when the glycogen in the phosphorus-accumulating-organisms is exhausted. Under the condition of lower initial HAc-COD, HAc became the limiting factor after some time for anaerobic HAc uptake. Under the condition of higher initial HAc-COD, HAc uptake was stopped because of the depletion of glycogen in the microorganisms. The mean ratio of ∆ρ P /∆ρ PHB , ∆ρ GLY /∆ρ PHB , ∆ρ P /∆COD, and ∆ρ PHB /∆COD was 0.48, 0.50, 0.44, and 0.92, respectively, which was nearly the same as the theoretical value. The calibrated kinetic parameters of the HAc-uptake and phosphorus-release model were evaluated as follows: Q HAc,max was 164 mg/(g · h), Q P,max was 69.9 mg/(g · h), K gly was 0.005, and K COD was 3 mg/L. An apparently linear correlation was observed between the ratio of ∆ρ P /∆COD and pH of the solution, and the equation between them was obtained in this study.

show abstract

“…Combined anaerobic/aerobic wastewater treatment has received considerable attention for effective nutrient (N, P) removal [1], enhanced degradation of recalcitrant xenobiotics [2] and COD removal of high strength industrial wastewater with reduced energy consumption and sludge disposal [3]. The organic pollutants are ®rstly converted to metabolic intermediates under anaerobic conditions that give an easier degradation or produce less sludge than their previous forms in the second aerobic degradation.…”

Section: Introductionmentioning

confidence: 99%

Distribution and change of microbial activity in combined UASB and AFB reactors for wastewater treatment

Chen

et al. 2000

Bioprocess Engineering

View full text Add to dashboard Cite

A thermophilic up¯ow anaerobic sludge blanket (UASB) reactor was combined with a mesophilic aerobic uidized bed (AFB) reactor for treatment of a medium strength wastewater with 2,700 mg COD l )1 . The COD removal ef®ciency reached 75% with a removal rate of 0.2 g COD l )1 h )1 at an overall hydraulic retention time 14 hours. The distribution of microbial activity and its change with hydraulic retention time in the two reactors were investigated by measuring ATP concentration in the reactors and speci®c ATP content of the biomass. In the UASB reactor, the difference in speci®c ATP was signi®cant between the sludge bed and blanket solution (0.02 mg ATP g VS )1 versus 0.85 mg ATP g VS )1 ) even though the ATP concentrations in these two zones were similar. A great pH gradient up to 4 was developed along the UASB reactor. Since a high ATP or biological activity in the blanket solution could only be maintained in a narrow pH range from 6.5 to 7.5, the sludge granules showed a high pH tolerance and buffering capacity up to pH 11. The suspended biomass in AFB reactor had a higher speci®c ATP than the biomass ®xed in polyurethane carriers (1.6 mg ATP g VS )1 versus 1.1 mg ATP g VS )1 ), which implies a starvation status of the immobilized cells due to mass transfer limitation. The aerobes had to work under starvation conditions in this polishing reactor. The anaerobic biomass brought into AFB reactor contributed to an increase in suspended solids, but not the COD removal because of its fast deactivation under aerobic conditions. A second order kinetic model was proposed for ATP decline of the anaerobes. The results on distribution of microbial activity in the two reactors as well as its change with hydraulic retention time lead to further performance improvement of the combined anaerobic/aerobic reactor system.

show abstract

The effect of volatile fatty acids on enhanced biological phosphorus removal and population structure in anaerobic/aerobic sequencing batch reactors

Cited by 30 publications

References 0 publications

Determination of Aqueous Formic and Acetic Acids by Purge-and-Trap Analysis with a Needle-Type Extraction Device and Gas Chromatography Barrier Discharge Ionization Detector

Determination of Aqueous Formic and Acetic Acids by Purge-and-Trap Analysis with a Needle-Type Extraction Device and Gas Chromatography Barrier Discharge Ionization Detector

Kinetic analysis of anaerobic phosphorus release during biological phosphorus removal process

Distribution and change of microbial activity in combined UASB and AFB reactors for wastewater treatment

Contact Info

Product

Resources

About