Energy efficient treatment of A-stage effluent: pilot-scale experiences with shortcut nitrogen removal

Seuntjens, Dries; Bundervoet, Bert; Mollen, Hans; Mulder, Chaïm De; Wypkema, Etteke; Verliefde, Arne; Colsen, Joop; Vlaeminck, Siegfried E.

doi:10.2166/wst.2016.005

Cited by 20 publications

(12 citation statements)

References 22 publications

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“…Laboratory and pilotscale research on the mainstream application is currently pursued worldwide. But a limited amount of work is done on pilot-scale installations fed with real wastewater [9,[12][13][14]. The laboratory and pilot-scale results indicate that the main challenge of implementing the technology is the low water temperatures during winter.…”

Section: Introductionmentioning

confidence: 99%

Towards mainstream anammox: lessons learned from pilot-scale research at WWTP Dokhaven

Hoekstra

Geilvoet²,

Hendrickx

et al. 2018

Environmental Technology

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The aim of this research was to study the biological feasibility of the Partial Nitritation/Anammox (PN/A) technology to remove nitrogen from municipal mainstream wastewaters. During stable process operations at summer temperatures (23.2 ± 1.3°C), the total nitrogen removal rate was 0.223 ± 0.029 kg N (md) while at winter temperatures (13.4 ± 1.1°C) the total nitrogen removal rate was 0.097 ± 0.016 kg N (m d). Nitrite-oxidizing bacteria (NOB) suppression was successfully achieved at the complete temperature range of municipal mainstream wastewater. Despite the presence of NOB as observed in activity tests, their activity could be successfully suppressed due to a relative low dissolved oxygen concentration. An overcapacity of ammonia-oxidizing bacteria and anammox activity was always present. Long-term stability is a focus point for future research, especially in relation to the stability of the biological oxygen demand removing step, preceding the PN/A reactor.

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Section: Introductionmentioning

confidence: 99%

Towards mainstream anammox: lessons learned from pilot-scale research at WWTP Dokhaven

Hoekstra

Geilvoet²,

Hendrickx

et al. 2018

Environmental Technology

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“…Lotti et al [16] treated much higher NLR (up to 570 mg N/L•d) with a maximum NRE of 46% limited by the high nitrate concentrations registered in the effluent (9 mg N/L), and approximately 18 mg TN/L present in the effluent. Regarding the previous studies the fact that many of them used municipal wastewater supplemented with ammonium must be considered [13,14], which is not the case of the present study. Laureni et al [11] also treated low loaded wastewater achieving NRE up to 63% removing NLR of (Table 1).…”

Section: Reactor Performancementioning

confidence: 84%

“…The pH value in the influent of the pilot plant was higher than 6.9 ( Table 3 and Figure 2), throughout the complete operational period, which facilitates the control of the process based on a set point of pH ≤ 6.0. Since the nitritation process consumes alkalinity, the addition of chemicals is not needed to control the pH value at 6.0, contrary to previous studies [13,16]. Most of the already published PN/AMX studies control the pH value inside the reactor to values higher than 7.0.…”

Section: Reactor Performancementioning

confidence: 93%

“…Most of the already published PN/AMX studies control the pH value inside the reactor to values higher than 7.0. Seuntjens et al [13] treated in a PN-AMX unit the effluent of an aerobic A-stage supplemented with extra ammonium, and added Na2CO3 to compensate the alkalinity consumption and to maintain the pH value at 7.0-7.3. Lotti et al [16] be prejudicial for both AOB and anammox bacteria [26,28].…”

Section: Reactor Performancementioning

confidence: 99%

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Pilot-scale ELAN ® process applied to treat primary settled urban wastewater at low temperature via partial nitritation-anammox processes

Pedrouso

Aiartza

Morales³

et al. 2018

Separation and Purification Technology

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A single stage partial nitritation and anammox granular pilot scale reactor (600 L) was operated to treat primary settled sewage in an urban wastewater treatment plant. The fed wastewater contained low total nitrogen concentrations of 6-25 mg TN/L and the system operated without temperature control ranging from 18 to 12 ºC. A control strategy, based on the pH value, was applied to stop the aeration supply. The pH setpoint was fixed at 6.0 and allowed obtaining a total nitrogen removal efficiency approximately of 50% treating a load of 67 mg TN/(L•d) without the addition of any chemicals. Although nitrite oxidizing bacteria were present in the inoculated sludge, when the pH-based control was implemented (day 30) the ammonium oxidation was favored compared to the nitrite oxidation activity. Then, the system operated stable the rest of the operational period (days 30-94) despite the presence of organic matter in the wastewater and the high variability of nitrogen load and temperature during the

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“…In recent years, a pilot scale PN/A process has been operated at the WRRF Nieuwveer as a more sustainable and cost effective alternative to treat the effluent of the HRAS process. However, the ESS concentrations produced by the HRAS system are relatively high (65 ± 22 mg TSS L −1 ) in the current operation ( Figure 2), and excessive sludge loss disturbs the performance of the PN/A pilot [15,32]. In this context, there is high interest to look into potential improvement of the flocculation process.…”

Section: High Rate Activated Sludge System Under Studymentioning

confidence: 99%

The Impact of Local Hydrodynamics on High-Rate Activated Sludge Flocculation in Laboratory and Full-Scale Reactors

et al. 2020

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High rate activated sludge (HRAS) processes have a high potential for carbon and energy recovery from sewage, yet they suffer frequently from poor settleability due to flocculation issues. The process of flocculation is generally optimized using jar tests. However, detailed jar hydrodynamics are often unknown, and average quantities are used, which can significantly differ from the local conditions. The presented work combined experimental and numerical data to investigate the impact of local hydrodynamics on HRAS flocculation for two different jar test configurations (i.e., radial vs. axial impellers at different impeller velocities) and compared the hydrodynamics in these jar tests to those in a representative section of a full scale reactor using computational fluid dynamics (CFD). The analysis showed that the flocculation performance was highly influenced by the impeller type and its speed. The axial impeller appeared to be more appropriate for floc formation over a range of impeller speeds as it produced a more homogeneous distribution of local velocity gradients compared to the radial impeller. In contrast, the radial impeller generated larger volumes (%) of high velocity gradients in which floc breakage may occur. Comparison to local velocity gradients in a full scale system showed that also here, high velocity gradients occurred in the region around the impeller, which might significantly hamper the HRAS flocculation process. As such, this study showed that a model based approach was necessary to translate lab scale results to full scale. These new insights can help improve future experimental setups and reactor design for improved HRAS flocculation.

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Energy efficient treatment of A-stage effluent: pilot-scale experiences with shortcut nitrogen removal

Cited by 20 publications

References 22 publications

Towards mainstream anammox: lessons learned from pilot-scale research at WWTP Dokhaven

Towards mainstream anammox: lessons learned from pilot-scale research at WWTP Dokhaven

Pilot-scale ELAN ® process applied to treat primary settled urban wastewater at low temperature via partial nitritation-anammox processes

The Impact of Local Hydrodynamics on High-Rate Activated Sludge Flocculation in Laboratory and Full-Scale Reactors

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