Biodegradation of the endogenous residue of activated sludge

Ramdani, Abdellah; Dold, Peter; Déléris, S.; Lamarre, Daniel; Gadbois, Alain; Comeau, Yves

doi:10.1016/j.watres.2009.12.037

Cited by 95 publications

(56 citation statements)

References 32 publications

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“…From the reaction period and the decrement of DO, a dataset of OUR e_OHO for 6 − 8 days was obtained. Based on the decline of OUR e_OHO along with the batch incubation time (6 − 8 OUR e_OHO plots per batch test), specific decay rate of X OHO (b OHO ) and the X OHO concentration in the activated sludge were calculated according to the decay concept of ASM3 using equation (1) [6,9,10]. A total of 12 activated sludge samples of each ASR were examined during the field experiment.…”

Section: Laboratory Analysismentioning

confidence: 99%

“…To estimate autotrophic nitrifying organism concentration (X ANO ) from equation 2 [10], nitrifier's maximum oxygen uptake rates (OUR max_ANO ) in ASRs were also regularly monitored with the addition of ammonium chloride to be 50 mg-N/L. As X ANO could not be separated from μ max_ ANO ·X ANO /Y ANO unless μ max_ANO /Y ANO was determined, the kinetic parameter was adopted to be 4.17 mg-N/g-COD/day at 20°C with a temperature coefficient θ = 1.07 according to Henze et al (2000) [6].…”

Section: Laboratory Analysismentioning

confidence: 99%

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An Alternative Method to Estimate Influent Concentration Using On-site Lab-scale Activated Sludge Reactors

Duong

Tran

et al. 2017

J. of Wat. & Envir. Tech.

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Conventional wastewater analysis based on on-site sampling holds a limitation of accuracy because of fluctuation of influent composition in time and its corruptible nature in organics. To cope with the problem, this study aimed at developing an alternative method using on-site lab-scale activated sludge reactors, where a set of mean influent material concentrations was calculated from the analysis of activated sludge constituents of which fluctuation was damped due to long sludge retention time. Focusing on the activated sludge collected from the reactor having a primary settling tank, the soluble biodegradable material concentrations in the influent were calculated using IWA Activated Sludge Model. Similarly the concentrations of inert and biodegradable particulates in the influent were obtained from the increment of activated sludge constituents between the reactor without a primary settling tank and that with a primary settling tank. The specific decay rate of the activated sludge, which was an influential kinetic parameter on the mathematical calculation, was also regularly monitored. According to the statistical analysis, 6 collection frequencies seemed to be enough to grab the parameter. This new method required noticeably low manpower to estimate particulate BOD, soluble BOD, SS and VSS in the wastewater compared to the conventional techniques.

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Section: Laboratory Analysismentioning

confidence: 99%

Section: Laboratory Analysismentioning

confidence: 99%

An Alternative Method to Estimate Influent Concentration Using On-site Lab-scale Activated Sludge Reactors

Duong

Tran

et al. 2017

J. of Wat. & Envir. Tech.

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“…Phothilangka et al (2008) considered the transformation of Z e to bCOD but did not consider the transformation of X i to bCOD. Ramdani et al (2010) have shown that the COD fractionation of activated sludge is substantially simplified when the system is fed with a synthetic soluble biodegradable substrate such as acetate. The MLSS composition of real and synthetically-fed activated sludge systems is depicted in Figure 2.1 (Ramdani et al, 2010).…”

Section: Existing Pretreatment Modelsmentioning

confidence: 99%

Investigation of the Impacts of Thermal Activated Sludge Pretreatment and Development of a Pretreatment Model

Burger¹,

Parker²

2013

proc water environ fed

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Waste activated sludge (WAS) pretreatment technologies are typically evaluated in terms of the associated improvement in biogas and sludge production during digestion and post-digestion dewaterability. However, WAS properties, and hence the impact of pretreatment on WAS properties, are dependent upon the raw wastewater composition and configuration of the wastewater treatment plant (WWTP). A generally accepted means of characterizing and comparing all pretreatment processes does not exist. The motivation for this project was to evaluate the impact of pretreatment on WAS properties in terms of changes in COD fractionation. The first objective of this study was to fractionate the COD of the WAS before and after pretreatment to show how pretreatment may increase the rate and extent of aerobic digestion. The second objective was to develop a COD-based stoichiometric pretreatment model that may be integrated into WWTP simulations.A bench-scale biological reactor (BR) with a solids retention time (SRT) of 5 days was started up with WAS from the Waterloo WWTP. The BR was fed daily with a completely biodegradable synthetic substrate so that the BR WAS contained only biomass and decay products after 3 SRTs of operation. In the first phase of the study, an aerobic digester (AD) with a SRT of 10 d was fed daily with BR WAS. The BR-AD system was operated at steady state for one month. A range of physical and biochemical properties were regularly measured in each process stream. Offline respirometric tests were regularly conducted to determine the aerobic degradability and fractionate the COD of the BR and AD WAS. The oxygen uptake rate (OUR) associated with the daily addition of BR WAS to the AD was determined as an additional measurement of the aerobic degradability of the BR WAS.In the second phase of the study, the BR WAS was pretreated prior to being fed daily to the AD.High pressure thermal hydrolysis (HPTH) pretreatment was selected for this project since it is one of the most popular and promising pretreatment techniques. A sealed volume of BR WAS was heated to 150 o C at 3 bars for 30 minutes. The same physical, biochemical and biological tests used to characterize the process streams in Phase 1 were employed to characterize those in Phase 2. The Phase 2 system was operated for two months at steady-state.The results of several independent tests showed that the COD of the BR WAS was comprised of storage products (X STO ) in addition to active heterotrophs (Z bh ) and decay products (Z e ). However, it was shown that the AD WAS only contained Z bh and Z e as X STO was depleted in the AD. iv HPTH pretreatment did not reduce the TCOD concentration of the WAS however it did solubilize 56 ± 7% of COD, 49% ± 11% of organic nitrogen, 56 ± 10% of VSS and did not solubilize ISS.Furthermore, pretreatment did not generate soluble non-biodegradable COD. These findings were consistent with prior research on HPTH WAS pretreatment. Pretreatment increased the rate at which the BR WAS was aerobically degraded. The offline res...

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“…The estimation of the endogenous decay coefficient b H and the heterotrophic active fraction were carried out according to the ''single batch test'' (among others Ramdani et al, 2010;Di Trapani et al, 2014). Briefly, the biomass samples were subjected to aerobic digestion for several days (at least 5, in the present study) without external substrate addition and the endogenous respiration rate was monitored; b H was then derived from the slope of the respiration/time linear regression curve.…”

mentioning

confidence: 99%

Effect of C/N shock variation on the performances of a moving bed membrane bioreactor

Trapani

Bella

Mannina

et al. 2015

Bioresource Technology

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Biodegradation of the endogenous residue of activated sludge

Cited by 95 publications

References 32 publications

An Alternative Method to Estimate Influent Concentration Using On-site Lab-scale Activated Sludge Reactors

An Alternative Method to Estimate Influent Concentration Using On-site Lab-scale Activated Sludge Reactors

Investigation of the Impacts of Thermal Activated Sludge Pretreatment and Development of a Pretreatment Model

Effect of C/N shock variation on the performances of a moving bed membrane bioreactor

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