Activated Sludge Model No.2d, ASM2D

Henze, Mogens; Gujer, Willi; Mino, Toshihiro; Matsuo, Tetsuji; Wentzel, M. C.; Marais, G. V. R.; Loosdrecht, Mark C.M. van

doi:10.2166/wst.1999.0036

Cited by 679 publications

(499 citation statements)

References 0 publications

Supporting

Mentioning

434

Contrasting

Unclassified

Order By: Relevance

“…This variation does not give a perfect fit to a straight line, as occurs when a simple carbon source (methanol, acetate, for example) is used. According to the results of other researchers [23,32,33], three linear phases of nitrate reduction occur simultaneously during the process of denitrification employing activated sludge from denitrifying systems acting upon complex carbon sources such as industrial effluents. The highest denitrification rate is provided by the most readily biodegradable COD; a slower rate is provided by the more slowly biodegradable COD, which needs to be hydrolysed prior to denitrification; while the lowest denitrification rate is provided by endogenous carbon.…”

Section: Denitrification With Alternative Carbon Sourcesmentioning

confidence: 99%

Denitrification of high nitrate concentration wastewater using alternative carbon sources

Fernández-Nava

Marañón

Soons

et al. 2010

Journal of Hazardous Materials

191

View full text Add to dashboard Cite

The use of different organic carbon sources in the denitrification of wastewater containing 2500 mg nitrates/L in a SBR was studied. Three alternative sources of carbon were tested: wastewater from a sweet factory, a residue from a soft drinks factory and a residue from a dairy plant. The first two are sugar rich, whereas the third presents a high content in lactic acid. Maximum specific denitrification rates of between 42 and 48 mg NO 3 -N/g VSS·h were obtained. The effluents were nitrate free and very low COD concentrations were obtained in 4-6 hours reaction time, especially with the sugar-rich carbon sources. The values of the denitrifier net yield coefficient were higher than when using methanol (0.93-1.75 g VSS formed /g NOx-N reduced ). The lowest value was obtained using the lactic acid-rich residue. The optimum COD/N ratios varied between 4.6 for the lactic acid-rich carbon source and 5.5 -6.5 for the sugar-rich carbon sources.

show abstract

Section: Denitrification With Alternative Carbon Sourcesmentioning

confidence: 99%

Denitrification of high nitrate concentration wastewater using alternative carbon sources

Fernández-Nava

Marañón

Soons

et al. 2010

Journal of Hazardous Materials

191

View full text Add to dashboard Cite

show abstract

“…Moreover, it is widely recognized that both of denitrification and phosphorus release require organism substrates as electron donor, which is a bottle-neck in resent wastewater treatment plants, especially in China with low COD/N ratio. Thus applying DPAOs in the plants has integrated nitrogen and phosphorus removal for COD is utilized simultaneously, which is beneficial for reduction of COD consumption [8], lower aeration requirement [9], and less sludge production [10]. Although many literatures reported the variety of factors that affected anaerobic phosphorus release and organism uptake, such as MLSS , SRT [11], COD/N,COD/P [12], there are few implies that all the factors would have indirectly or directly impact on the P removal efficiency through P release.…”

Section: Introductionmentioning

confidence: 99%

Influence of Phosphorus Release and Initial Nitrate Concentration on Anoxic Phosphorus Uptake

Xu¹

2015

IJESD

View full text Add to dashboard Cite

Abstract-Denitrifying phosphorus removal technology has advantage on beneficial for reduction of COD consumption, and the anoxic phosphorus uptake process is the key process. This study was to investigate the effect of the phosphorus release and initial nitrate concentration, which are two important infectors, on the anoxic phosphorus uptake process, by batch two Tests. The results show that the improvement of Prelease/MLSS would increase the amount of nitrogen and phosphorus removal as well as the specific phosphorus uptake rate(PUR),and the relationship between the amount of P release per MLSS was found in this paper. Nitrate would have little impact on the phosphorus uptake rate in anoxic condition if nitrate was adequate as the electron acceptor. Besides, a function formula was fitted to predict the amount of electron acceptor by the amount of P release per MLSS. I. INTRODUCTIONOver the last decades, the discovery of denitrification phosphate accumulating organisms (DPAO) has been extensively reported, These organisms, as conventional poly-P bacteria, could sequester organic substrates under anaerobic condition, Instead, they utilize nitrate or nitrite as electron acceptor to accumulate phosphate [1]- [7]. Moreover, it is widely recognized that both of denitrification and phosphorus release require organism substrates as electron donor, which is a bottle-neck in resent wastewater treatment plants, especially in China with low COD/N ratio. Thus applying DPAOs in the plants has integrated nitrogen and phosphorus removal for COD is utilized simultaneously, which is beneficial for reduction of COD consumption [8], lower aeration requirement [9], and less sludge production [10]. Although many literatures reported the variety of factors that affected anaerobic phosphorus release and organism uptake, such as MLSS , SRT [11], COD/N,COD/P [12], there are few implies that all the factors would have indirectly or directly impact on the P removal efficiency through P release. No matter what had influenced the anaerobic P release, the amount of phosphorus release could be expressed all the factors affecting P removal. Furthermore, the investigation of the amount of P release should eliminate the influence of MLSS on operation of the experiment, which promoted the concept of the amount of P release per MLSS (Prelease/MLSS). Hence in this study we focused on the investigation of the effect of Prelease/MLSS on the phosphate and nitrogen removal, which will benefit for further innovative processes investigation. Furthermore, the validation of the positive role of nitrate in phosphorus uptake under anoxic condition has been highlighted in literatures [13]- [15]. Conclusion that adequate amount of nitrate would ensure the phosphorus uptake performance had been verified [16]. However, it is necessary to investigate the relation of P-uptake rate and the concentration of nitrate. Most importantly, nitrate should be controlled in a range of value to validate its sufficient requirement as electron acceptor under anoxic condition in...

show abstract

“…The widely used models for simulating activated sludge processes are the so-called activated sludge models (ASMs) developed by the International Water Association (IWA). ASM1 describes the removal processes of carbon and nitrogen from wastewater [2].…”

Section: Introductionmentioning

confidence: 99%

Calibration of ASM1 for Carbon and Nitrogen Removals of Riqqa Activated Sludge System, Kuwait

Abusam¹

2014

IJMO

View full text Add to dashboard Cite

Abstract-Riqqa plant, the second largest wastewater treatment plant in Kuwait, has lately shown signs of working under unstable conditions. The Kuwait Institute for Scientific Research has conducted a study to evaluate the plant performance and to pin-point the probable causes of the problem. To achieve these objectives, the Riqqa activated sludge system was modelled using activated sludge model No. 1 (ASM1) in SIMBA simulation package. It was the first time to use ASM1 to model a full-scale activated sludge system in Kuwait. This paper presents the calibration of ASM1 to carbon and nitrogen removals of the Riqqa activated sludge system, using long-term routinely measured wastewater quality parameters. Repirometery analysis was used to help in chemical oxygen demand (COD) fractionation and for providing initial guess values for the calibrated parameters. Validation results showed reasonable agreement between the measured and simulated COD, NH 4 -N and NO 3 -N over long-term dynamic simulation. The developed model was then used to evaluate and diagnose the system performance. The values of ASM1 parameters obtained will be useful in modelling other activated sludge systems in the country.

show abstract

Activated Sludge Model No.2d, ASM2D

Cited by 679 publications

References 0 publications

Denitrification of high nitrate concentration wastewater using alternative carbon sources

Denitrification of high nitrate concentration wastewater using alternative carbon sources

Influence of Phosphorus Release and Initial Nitrate Concentration on Anoxic Phosphorus Uptake

Calibration of ASM1 for Carbon and Nitrogen Removals of Riqqa Activated Sludge System, Kuwait

Contact Info

Product

Resources

About