Achieving positive net energy in a nutrient removal facility: optimizing the Ejby Molle WWTP

Nielsen, Per Henrik; Sandino, Julián; Leth, Mads; Whitlock, Dru; Johnson, T. C.; Constantine, Tim; Houweling, Dwight

doi:10.2166/wpt.2015.020

Cited by 3 publications

(1 citation statement)

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“…The hydrocyclone process operated in Denmark was designed to separate high density granules from mainstream return activated sludge (RAS) to be recycled for biomass retention within the mainstream BNR process. Ultimately, AMX retention in the mainstream reactor would be desired once transitioned from a BNR process to a mainstream anammox system to reduce overall treatment costs and energy and chemical usage (Nielsen et al, 2015 ). The goal of this system was to effectively select for biomass in the underflow with improved settling capability, characteristic of denser granules.…”

Section: Resultsmentioning

confidence: 99%

Structural and Functional Interrogation of Selected Biological Nitrogen Removal Systems in the United States, Denmark, and Singapore Using Shotgun Metagenomics

et al. 2018

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Conventional biological nitrogen removal (BNR), comprised of nitrification and denitrification, is traditionally employed in wastewater treatment plants (WWTPs) to prevent eutrophication in receiving water bodies. More recently, the combination of selective ammonia to nitrite oxidation (nitritation) and autotrophic anaerobic ammonia oxidation (anammox), collectively termed deammonification, has also emerged as a possible energy- and cost-effective BNR alternative. Herein, we analyzed microbial diversity and functional potential within 13 BNR processes in the United States, Denmark, and Singapore operated with varying reactor configuration, design, and operational parameters. Using next-generation sequencing and metagenomics, gene-coding regions were aligned against a custom protein database expanded to include all published aerobic ammonia oxidizing bacteria (AOB), nitrite oxidizing bacteria (NOB), anaerobic ammonia oxidizing bacteria (AMX), and complete ammonia oxidizing bacteria (CMX). Overall contributions of these N-cycle bacteria to the total functional potential of each reactor was determined, as well as that of several organisms associated with denitrification and/or structural integrity of microbial aggregates (biofilm or granules). The potential for these engineered processes to foster a broad spectrum of microbial catabolic, anabolic, and carbon assimilation transformations was elucidated. Seeded sidestream DEMON® deammonification systems and single-stage nitritation-anammox moving bed biofilm reactors (MBBRs) and a mainstream Cleargreen reactor designed to enrich in AOB and AMX showed lower enrichment in AMX functionality than an enriched two-stage nitritation-anammox MBBR system treating mainstream wastewater. Conventional BNR systems in Singapore and the United States had distinct metagenomes, especially relating to AOB. A hydrocyclone process designed to recycle biomass granules for mainstream BNR contained almost identical structural and functional characteristics in the overflow, underflow, and inflow of mixed liquor (ALT) rather than the expected selective enrichment of specific nitrifying or AMX organisms. Inoculum used to seed a sidestream deammonification process unexpectedly contained <10% of total coding regions assigned to AMX. These results suggest the operating conditions of engineered bioprocesses shape the resident microbial structure and function far more than the bioprocess configuration itself. We also highlight the advantage of a systems- and metagenomics-based interrogation of both the microbial structure and potential function therein over targeting of individual populations or specific genes.

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Section: Resultsmentioning

confidence: 99%

Structural and Functional Interrogation of Selected Biological Nitrogen Removal Systems in the United States, Denmark, and Singapore Using Shotgun Metagenomics

et al. 2018

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Water resource recovery facilities as potential energy generation units and their dynamic economic dispatch

Liu

Dereli

et al. 2022

Applied Energy

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A Study on the Potential Evaluation of Achieving Power Independence and Net Zero CO<sub>2</sub> Emission at Sewage Treatment Plant

Fukushima

2021

Mizu Kankyo Gakkaishi

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To achieve power independence and net zero CO 2 emission at sewage treatment plants, a performance evaluation system (PES) was used at five sites with a treatment capacity of 150,000 to 200,000 m 3 day -1 , to estimate the power self-sufficiency rate and GHG(Greenhouse Gas) intensity. For power independence, the combination of energy saving and energy production measures was evaluated. When the energy saving measures were introduced at Treatment Plant A, the amount of power consumption decreased to 31,840 kWh day -1(reduction of about 20%) , and the power selfsufficiency rate improved to 83%. Moreover, when energy production measures were introduced, the amount of power generation increased to 38,800 kWh day -1(increase of about 50%) , and the power self-sufficiency rate was 105%, which was considered to indicate power independence. To promote net zero CO 2 emission, the GHG intensity and offset rate were evaluated. Even at Treatment Plant A, the GHG intensity was calculated to be 0.17 kg m -3 that net zero CO 2 emission was not reached (offset rate of 48%) . By improving the operation of the incinerator, the GHG intensity may be improved to 0.08 kg m -3 (offset rate of 70%) . Looking toward the two goals, the power independence and GHG emissions were evaluated, and high potential to realize the envisioned sewage treatment plant was confirmed.

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Achieving positive net energy in a nutrient removal facility: optimizing the Ejby Molle WWTP

Cited by 3 publications

References 0 publications

Structural and Functional Interrogation of Selected Biological Nitrogen Removal Systems in the United States, Denmark, and Singapore Using Shotgun Metagenomics

Structural and Functional Interrogation of Selected Biological Nitrogen Removal Systems in the United States, Denmark, and Singapore Using Shotgun Metagenomics

Water resource recovery facilities as potential energy generation units and their dynamic economic dispatch

A Study on the Potential Evaluation of Achieving Power Independence and Net Zero CO<sub>2</sub> Emission at Sewage Treatment Plant

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