Biological treatment of sludge digester liquids

Loosdrecht, M.C.M. van; Salem, S.

doi:10.2166/wst.2006.401

Cited by 98 publications

(48 citation statements)

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“…Such waste stream of reject water is normally recycled back to the main wastewater process for treatment due to the low quality. This will accordingly contribute from 10-80% of P load, 20-30% of N load and 3-5% of COD load to the BNR process (Pitman, 1999;Loosdrecht and Salem, 2006;Dosta et al, 2007). As a result, P and N removal efficiency can be considerably affected.…”

Section: Introductionmentioning

confidence: 99%

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A promising approach of reject water treatment using a tidal flow constructed wetland system employing alum sludge as main substrate

Yang

Zhao

Wang³

et al. 2011

Water Science and Technology

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This study examined a novel reuse of alum sludge, an inescapable by-product of drinking water treatment process when aluminium salt is added as a coagulant, as the main medium in a laboratory-scale multi-stage constructed wetland (CW) system for reject water treatment. Such reject water is a main concern in municipal wastewater treatment plant (MWWTP) for increasing the organic and nutrient loading. A ‘tidal flow’ strategy was employed to enhance the wetland aeration to stimulate organic matters (OM) and ammoniacal-nitrogen (N) oxidation while the ‘step feed’ operation was adopted to supply the necessary amount of carbon source for denitrification. The results reveal that alum sludge acting as P adsorbent can secure the P removal. Meanwhile, high removals of N and OM can also be obtained due to the active bacteria growth on the alum sludge surface. The results show that average removal efficiencies of 65.4 ± 12.3% for chemical oxygen demand (COD), 67.8 ± 9.2% for five-day biochemical oxygen demand (BOD5), 33.6 ± 17.0% for N and 99.5 ± 0.49% for P can be achieved over a period of 190 days. This indicates that novel reuse of alum sludge as medium in CW system can provide a promising approach for reject water treatment. Therefore, it will significantly reduce the amount of pollutant feedback through reject water recycling in a MWWTP.

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Section: Introductionmentioning

confidence: 99%

“…These include SHARON process, ANAMMOX process, BABE process (Loosdrecht and Salem, 2006), sequencing batch reactor (SBR) and membrane bioreactor (MBR) (Dosta et al, 2007 ) and biofilter (Hwang et al, 2000). Meanwhile, chemical aids and/or physical-chemical processes have also been used for this purpose.…”

Section: Introductionmentioning

confidence: 99%

A promising approach of reject water treatment using a tidal flow constructed wetland system employing alum sludge as main substrate

Yang

Zhao

Wang³

et al. 2011

Water Science and Technology

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“…These potential benefits however come with challenges associated with NOB outselection under cold and diluted loading conditions. While the operational strategies are well documented for sidestream applications (Gut et al, 2005;Hellinga et al, 1998;van de Graaf et al, 1996;van Loosdrecht and Salem, 2005;Wett et al, 2007), many recent studies were conducted to address these challenges for mainstream applications using nitritation/denitritation (Blackburne et al, 2008;Gao et al, 2009Gao et al, , 2014Peng et al, 2004Peng et al, , 2012Regmi et al, 2013) and deammonification Hu et al, 2013;Lotti et al, 2013;Wett et al, 2013;Winkler et al, 2011) or both (Vlaeminck et al, 2012;. Several mechanisms were identified by which the three autotrophic groups, i.e.…”

Section: Introductionmentioning

confidence: 99%

Population balance models: a useful complementary modelling framework for future WWTP modelling

Torfs

Ducoste

Vanrolleghem

et al. 2014

Water Science and Technology

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Population balance models (PBMs) represent a powerful modelling framework for the description of the dynamics of properties that are characterised by distributions. This distribution of properties under transient conditions has been demonstrated in many chemical engineering applications. Modelling efforts of several current and future unit processes in wastewater treatment plants could potentially benefit from this framework, especially when distributed dynamics have a significant impact on the overall unit process performance. In these cases, current models that rely on average properties cannot sufficiently capture the true behaviour and even lead to completely wrong conclusions. Examples of distributed properties are bubble size, floc size, crystal size or granule size. In these cases, PBMs can be used to develop new knowledge that can be embedded in our current models to improve their predictive capability. Hence, PBMs should be regarded as a complementary modelling framework to biokinetic models. This paper provides an overview of current applications, future potential and limitations of PBMs in the field of wastewater treatment modelling, thereby looking over the fence to other scientific disciplines.

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“…The two subsequent conversion reactions are mediated by different groups of microbial species. Accumulation of the intermediate is desirable for innovative nitrogen removal processes based on the nitrite route (see, for example [18]). …”

Section: Introductionmentioning

confidence: 99%

Steady state multiplicity of two-step biological conversion systems with general kinetics

Volcke

Sbarciog

Noldus

et al. 2010

Mathematical Biosciences

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This study analyses the steady state behaviour of biological conversion systems with general kinetics, in which two consecutive reactions are carried out by two groups of micro-organisms. The model considered is a realistic description of wastewater treatment processes. A step-wise procedure is followed to reveal the mechanisms affecting the occurrence of steady states in terms of the process input variables. It is clearly demonstrated how taking into account inhibition effects by simply including additional inhibition terms to the kinetic expressions, a common practice, influences the model's long term behaviour. The overall steady state behaviour of the model has been summarized in easy-to-interpret operating diagrams, depicting the occurrence of steady states in terms of the reactor dilution rate and the influent substrate concentration, with well-defined boundaries between distinct * Corresponding author. Tel.: +32 9 264 61 29; fax: +32 9 264 62 35Email addresses: eveline.volcke@ugent.be (E.I.P. Volcke), mihaela@autoctrl.ugent.be (M. Sbarciog), erik.noldus@ugent.be (E.J.L. Noldus), bernard.debaets@ugent.be (B. De Baets), mia.loccufier@ugent.be (M. Loccufier) Preprint submitted to Mathematical BiosciencesSeptember 21, 2010 operating regions. This knowledge is crucial for modelers as steady state multiplicity -in the sense that more than one steady state can be reached depending on the initial conditions -may remain undetected during simulation. The obtained results may also serve for experimental design and for model validation based on experimental findings.

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Biological treatment of sludge digester liquids

Cited by 98 publications

References 0 publications

A promising approach of reject water treatment using a tidal flow constructed wetland system employing alum sludge as main substrate

A promising approach of reject water treatment using a tidal flow constructed wetland system employing alum sludge as main substrate

Population balance models: a useful complementary modelling framework for future WWTP modelling

Steady state multiplicity of two-step biological conversion systems with general kinetics

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