Bio-augmentation by nitrification with return sludge

Salem, S.; Berends, D.H.J.G.; Heijnen, Joseph J.; Loosdrecht, M.C.M. van

doi:10.1016/s0043-1354(02)00550-x

Cited by 58 publications

(36 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This is intimately linked to the slow growth rate of nitrifying bacterial biomass at low temperatures (Grady et al 1999). Based on mass balance considerations, it had been estimated that supplementing a system with 0.1 g of nitrifiers per day per g of nitrifiers already present can effectively reduce the SRT up to 45% at 8 °C (Salem et al 2003). The respirometric assays we performed showed that the influent AOB and NOB populations responded immediately to the addition of electron donors, and that they could attain full metabolic activity within 6.5 h and 4.5 h respectively ( Figure 2).…”

Section: Effects Of Nitrifier Seeding On Modelling Approachesmentioning

confidence: 88%

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

Torfs

Ducoste

Vanrolleghem

et al. 2014

Water Science and Technology

View full text Add to dashboard Cite

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.

show abstract

Section: Effects Of Nitrifier Seeding On Modelling Approachesmentioning

confidence: 88%

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

Torfs

Ducoste

Vanrolleghem

et al. 2014

Water Science and Technology

View full text Add to dashboard Cite

show abstract

“…Specific methane production rate was assumed 0.35 LN per 1 g COD anaerobically degraded in digestion process [15]. Specific energy production from and CHP efficiency 4 E3S Web of Conferences 22, 00070 (2017) DOI: 10.1051/e3sconf/20172200070 ASEE17 were assumed 3 kWh/m 3 CH4 and 36% respectively.…”

Section: Cost Calculationsmentioning

confidence: 99%

Towards energy neutrality of wastewater treatment plants via deammonification process

2017

View full text Add to dashboard Cite

Abstract. Energy neutrality of wastewater treatment plants is possible with constant and consistent optimization and implementation of new technologies. In recent years new process called deammonification has been discovered and implemented in treatment of side streams rich in nitrogen. With its implementation on wastewater treatment plants it is possible to remove nearly all nitrogen from side stream (even 30% of overall nitrogen load) in less energy consuming way. Additionally, thanks to lower nitrogen load to main stream reactors it is possible to optimize them to further lower energy consumption. This article presents simulation studies of deammonification implementation and main stream reactor optimization in case of medium Polish WWTP (115 000 p.e.). With removal of 20% of nitrogen in side stream via deammonification and subsequent main line optimization it is possible to save 5000 euro/year by lowering sludge retention time, oxygen concentration in main stream reactors. When additional COD is precipitated in primary clarifiers with iron coagulants, 55 000 euro/year can be saved in case of energy costs which states for most of the energy costs. However, when coagulant and disposal costs are included savings are on the level of 25 000 euro/year.

show abstract

“…In order to ensure a temperature of approximately 10°C necessary for biological reactions, one of the precautions taken is to cover the activated sludge aeration tanks (building closed with a roof). Different solutions for nitrification capacity enhancement have been reported as follows: external addition of nitrifying biomass (Kos, 1998;Salema et al, 2003), application of effluent enriched with nitrogen (for example alkali) to increase the nitrogen volumetric loading rate (Horan and Azimi, 1992;Canler et al, 2002;FNDAE_25, 2002), manipulation of the aerobic volume to adapt the aeration supply to satisfy the oxygen demand from on-line sensors (Brouwer et al, 1998;Isaacs and Thornberg, 1998;Ekman et al, 2006). Unfortunately, a significant start-up lag-time due to biological activity is required for the two first solutions; the third solution is adapted for an unexpected rapid variation of the loading rate.…”

Section: Introductionmentioning

confidence: 99%

A simulation-based optimisation approach to control nitrogen discharge by activated sludge under winter seasonal peak load

Choubert¹,

Racault²,

Grasmick³

et al. 2007

WSA

View full text Add to dashboard Cite

Wastewater treatment systems located in cold areas are under increasing pressure to remove nitrogen from their wastewater. As constraining operating conditions like dramatic influent load increases exacerbated by cold temperatures can occur (e.g. winter tourist resorts, ski resorts), specific technical treatment solutions have to be adapted. The objective of this research is to determine the maximal magnitude of load variation which can be applied in winter to an activated sludge treatment system. It aims at analyzing the effects of high influent load variations on the nitrogen removal capacity. Two operating strategies are investigated by dynamic simulations performed with ASM1: • A fixed aeration tank volume with a fixed MLTSS concentration • A variable aeration volume tank with a variable MLTSS concentration It is demonstrated that the variable aeration tank volume strategy is more efficient than the fixed volume strategy to face longterm peak load. To meet an effluent ammonia nitrate concentration of below 10 mgN·ℓ -1 , a maximum input load increase by a factor 2 should be applied with the first strategy; whereas with the second strategy a load increase by a factor 4 should be applied (with constant oxygen presence time). If the oxygen presence time can be increased by 50% the maximum input load increase could reach a factor 6.

show abstract

Bio-augmentation by nitrification with return sludge

Cited by 58 publications

References 12 publications

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

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

Towards energy neutrality of wastewater treatment plants via deammonification process

A simulation-based optimisation approach to control nitrogen discharge by activated sludge under winter seasonal peak load

Contact Info

Product

Resources

About