Anaerobic wastewater treatment

Lier, Jules B. van; Mahmoud, Nidal; Rea, Victor S. Garcia

doi:10.2166/9781789062304_0507

Cited by 7 publications

(10 citation statements)

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“…Assuming a COD consumption of 5% for bacterial growth under anaerobic conditions [24] and a COD:N molar ratio of 5 needed to form bacterial biomass [25], a mass of 3 mg of nitrogen was theoretically assimilated by microorganisms in the LPG incubation. Based on this assumption, there was still a gap of 9 mg N between the amount of produced NH 4 + -N and the added TN in the LPG.…”

Section: Resultsmentioning

confidence: 99%

Identification of protein-degraders in an anaerobic digester by protein stable isotope probing combined with metagenomics

Deng

Poulsen

Nielsen

et al. 2023

Preprint

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Background Presence of carbohydrates hampers protein degradation in anaerobic digesters. To understand this phenomenon, we used proteogenomics to identify the active protein-degraders in the presence of low and high carbohydrates concentrations. Active metabolic pathways of the identified protein-degraders were investigated using proteomics with 13C-protein substrates (protein stable isotope probing). Results Acinetobacter was identified as the main protein-degraders under both protein-fed and protein-glucose mixture-fed conditions. The incorporation of the 13C-labelled protein substrate was predominantly observed in outer membrane-bound proteins and porin proteins, which are associated with proteinases or the transportation of amino acids across the cell wall. The Acinetobacter metabolic model and the incubation conditions suggested that glucose and proteins were degraded through anaerobic respiration. Conclusions The unfavourable effect of the presence of carbohydrates on protein biodegradation was attributed to Acinetobacter’s preference for substrate. This work highlights that efficient degradation of protein and carbohydrate mixtures in anaerobic digesters requires a staged or time-phased approach and enrichment of active protein-degraders.

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Section: Resultsmentioning

confidence: 99%

Identification of protein-degraders in an anaerobic digester by protein stable isotope probing combined with metagenomics

Deng

Poulsen

Nielsen

et al. 2023

Preprint

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Section: Introductionmentioning

confidence: 99%

“…Anaerobic digestion (AD) is a widely used technology for wastewater treatment due to its low sludge production when compared to aerobic treatment (up to one-tenth), the nutrientrich effluent, and the production of energy as biogas. 1 Among the AD technologies, the anaerobic membrane bioreactor (AnMBR) is a promising alternative to treat municipal wastewater from a resource-oriented perspective. 2 AnMBR units were first developed in the late 1980s for industrial wastewater treatment and are now considered one of the emerging anaerobic technologies that generate high-quality effluents of interest for subsequent reuse.…”

Section: Introductionmentioning

confidence: 99%

Effects of Low Oxygen Dosages on an Anaerobic Membrane Bioreactor, Simulating the Oxygen Load in an Anaerobic Digester-Dissolved Air Flotation (AD-DAF) System

Piaggio,

Sasidhar,

Khande

et al. 2023

ACS EST Water

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This study reports the effects of microaeration on a laboratory-scale AnMBR (MA-AnMBR) fed with synthetic concentrated domestic sewage. The imposed oxygen load mimics the oxygen load coming from a dissolved air flotation (DAF) unit, establishing an anaerobic digester-DAF (AD-DAF) combination with sludge recycling. Results showed a reduced COD concentration in the MA-AnMBR permeate compared with the AnMBR permeate, from 90 to 74 mgCOD L −1 , and a concomitant 27% decrease in biogas production. The MA-AnMBR permeate ammonium (NH 4 + ) concentration increased by 35%, to 740 mgNH 4 + -N L −1 , indicating a rise in the hydrolytic capacity. Furthermore, the MA-AnMBR biomass seemingly adapted to an increased oxygen load, which corresponded to 1% of the influent COD load (approximately 55 mLO 2 d −1 ). Concomitantly, an increase in the superoxide dismutase activity (SOD) of biomass was detected. Meanwhile, negligible changes were observed in the specific methanogenic activity (SMA) of the microaerated biomass that was subjected to an oxygen load equivalent to 3% of the influent COD load in batch tests. The obtained results showed that an AD-DAF system could be a promising technology for treating concentrated domestic wastewater, improving sewage sludge hydrolysis, and overall organic matter removal when compared to an AnMBR.

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“…Currently, full‐scale anaerobic sludge blanket bioreactors are primarily implemented in tropical climates, such as in areas of South America and Asia (Chernicharo et al, 2015; Lettinga et al, 2001; van Lier et al, 2008). However, the development of viable low‐temperature anaerobic sludge blanket bioreactors that meet the effluent goals for wastewater treatment is an area of ongoing research (Chernicharo et al, 2015; Hahn & Figueroa, 2015; Pfluger, Vanzin, et al, 2018; Shoener et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…However, the development of viable low‐temperature anaerobic sludge blanket bioreactors that meet the effluent goals for wastewater treatment is an area of ongoing research (Chernicharo et al, 2015; Hahn & Figueroa, 2015; Pfluger, Vanzin, et al, 2018; Shoener et al, 2014). The most commonly studied anaerobic sludge blanket bioreactors include the upflow anaerobic sludge blanket (UASB), the anaerobic baffled reactor (ABR), and the expanded granular sludge blanket (EGSB) bioreactor (van Lier et al, 2008). Of these systems, ABRs have a simple design, low capital, and operating costs and provide better retention of solids in response to load variations than single‐compartment UASB or EGSB reactors (Bachmann et al, 1985; van Lier et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of three pilot‐scale multi‐compartment anaerobic baffled reactors treating domestic wastewater at psychrophilic temperatures in Colorado

Callahan,

Pfluger,

Coffey

et al. 2023

Water Environment Research

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A transition from inefficient aerobic wastewater treatment methods to sustainable approaches is needed. Anaerobic bioreactors are a viable solution as they consume less energy, reduce biosolid production, and provide a source of renewable methane‐rich biogas. A barrier to widespread implementation of anaerobic technologies is the lack of design guidance, especially in colder climates. This study bridges this knowledge gap by deriving design principles from three long‐running pilot‐scale anaerobic baffled reactors (ABRs) operating under psychrophilic conditions. The ABRs removed an average of 56% and 80% chemical oxygen demand (COD) and suspended solids, respectively, with a methane yield of 0.21 L CH4/g CODrem. Methane production may be improved with increased influent sCOD concentrations and decreased sulfate concentrations. Results suggest that ABRs can treat a range of wastewater strengths accompanied by useable methane production. Despite sharing location, temperature, and HRT, the ABRs displayed distinct performances, highlighting the significance of influent wastewater characteristics.Practitioner Points ABRs achieved 56% and 80% removal efficiencies for COD and suspended solids. Average biogas was 63% methane, and methane yield was 0.21 L CH4/g CODrem. Volumetric methane production was positively correlated with the influent sCOD/sulfate ratio and negatively correlated with influent sulfate loading.

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Anaerobic wastewater treatment

Cited by 7 publications

References 0 publications

Identification of protein-degraders in an anaerobic digester by protein stable isotope probing combined with metagenomics

Identification of protein-degraders in an anaerobic digester by protein stable isotope probing combined with metagenomics

Effects of Low Oxygen Dosages on an Anaerobic Membrane Bioreactor, Simulating the Oxygen Load in an Anaerobic Digester-Dissolved Air Flotation (AD-DAF) System

Performance analysis of three pilot‐scale multi‐compartment anaerobic baffled reactors treating domestic wastewater at psychrophilic temperatures in Colorado

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