Functional Redundancy of Microbial Anodes fed by Domestic Wastewater

Koch, Christin; Popiel, Dominika

doi:10.1002/celc.201402216

Cited by 38 publications

(30 citation statements)

References 56 publications

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“…The calculated volumetric heats of combustion of the oven-dried as well as the freeze-dried samples are in the same order of magnitude than previous estimations ( Table 2). The differences between energetic values obtained for oven-dried and freeze-dried samples for all three wastewater parameters (dry weight, ΔCHgrav, and ΔCHvol) illustrate that the freeze drying process decreases the loss of volatiles (e.g., acetate, propionate, and n-butyrate) which represent a considerable share of wastewater compounds (Koch et al, 2014). Thus, freeze drying is the superior method as it was suggested by Heidrich et al (2011).…”

Section: Discussion Assessing the Plausibility Of The Derived Heat Ofmentioning

confidence: 90%

Estimating the Energy Content of Wastewater Using Combustion Calorimetry and Different Drying Processes

2017

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The energy content of wastewater is routinely assessed by chemical oxygen demand (COD) measurements that only provide an incomplete picture and the data fundament of other energy parameters remains scarce. The volumetric heat of combustion (ΔCH) of raw wastewater from a municipal wastewater treatment plant (WWTP) was assessed using oven drying method (ΔCHvol = −6.8 ± 4.3 kJ L , n = 6) illustrating the substantial loss during the oven drying approach. Normalizing ΔCH to COD of raw wastewater yielded −6.2 ± 3.5 kJ gCOD −1 for oven-dried samples (n = 14) and −13.0 ± 1.6 kJ gCOD −1 for freeze-dried samples (n = 3). A subsequent correlation analysis with further chemical wastewater parameters revealed a dependency of ΔCHvol on COD, total organic carbon (TOC), C:N ratio, and total sulfur content. To verify these correlations, wastewater of a second WWTP was sampled and analyzed. Only COD and TOC were in accordance with the data set from the first WWTP representing potential predictors for the chemical energy stored in wastewater for comparable WWTPs. Unfortunately, during the most practical method (oven drying), a certain loss of volatile compounds is inevitable so that the derived ΔCHvol systematically underestimates the total energetic potential of wastewater. Nevertheless, this work expands the, so far, little data fundament on the energy resource wastewater and implies the requirement for further long-term studies on different sites and different wastewater types with a highly standardized sample treatment protocol.

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Section: Discussion Assessing the Plausibility Of The Derived Heat Ofmentioning

confidence: 90%

Estimating the Energy Content of Wastewater Using Combustion Calorimetry and Different Drying Processes

2017

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“…Maybe these “new” electroactive microorganisms require a specific limitation, a trigger or the absence of stable cultivation conditions for expressing their electroactivity. At the moment, there is only one cultured electroactive representative of the phylum Bacteroidetes, although different representatives are frequently found in wastewater derived electroactive microbial communities . Genomic analyses can help us to identify species that frequently appear in electroactive biofilms but they cannot tell us about their actual functionality.…”

Section: New Microbial Electrocatalysts For Seminal Applicationsmentioning

confidence: 99%

Is there a Specific Ecological Niche for Electroactive Microorganisms?

2016

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The core of primary microbial electrochemical technologies (METs) is the ability of the electroactive microorganisms to interact with electrodes via extracellular electron transfer (EET), allowing wiring of current flow and microbial metabolism. Geobacter sulfurreducens and Shewanella oneidensis are the model organisms for understanding and engineering EET. Many other microorganisms are reported being electroactive but are often sparsely characterized. Based on a literature survey 94 species are ascribed as electroactive. Their apparent diversity raises questions on the natural importance and distribution of the EET capacity, that is, of the ecological niche of microbial electroactivity. To identify this potential niche the environmental preferences and natural habitat characteristics of all electroactive species were combined with their metabolic, growth and EET characteristics and an extensive meta‐analysis performed. The results indicate that there is not a single ecological niche for electroactive microorganisms. Significantly more electroactive species presumably exist in nature as well as already existing strain collections but due to current cultivation techniques their EET potential is not leveraged. Thus, in the light of specific traits required for industrial application, microbial resource mining based on ecological knowledge bears a great potential for broadening the foundation of microbial electrochemistry as well as for future developments of primary METs.

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“…Thus, the pollutant removal efficiencies and the sludge settling capability of the MPSR tended to be more stable as the OLR increased in stages III and IV. Moreover, the diverse microbial communities of the MPSR meant that it was potentially qualified to treat wastewater with more complex compositions (Calheiros et al 2009;Koch et al 2014).…”

Section: The Role Of Enhanced Microbial Diversitymentioning

confidence: 99%

Improving oxygen dissolution and distribution in a bioreactor with enhanced simultaneous COD and nitrogen removal by simply introducing micro-pressure and swirl

Bian

Zhou

Huo

et al. 2015

Appl Microbiol Biotechnol

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Increasingly, environmental regulations are demanding more exacting chemical oxygen demand (COD) and nitrogen removal from wastewater, which come at a high economic cost. A very simple novel bioreactor, the micro-pressure swirl reactor (MPSR), can improve the dissolution and distribution of oxygen by the introduced micro-pressure swirl. Comparison with a conventional sequencing batch reactor (SBR) over 76 days of operation showed that this method can enhance simultaneous COD and nitrogen removal. By installing an aeration diffuser on one side of the two-dimensional MPSR, a swirl formed in the bioreactor that extended the retention time of the air bubbles. This unique flow regime, combined with the micro-pressure caused by the elevated water surface at the bubble outflow point, resulted in a higher level of dissolved oxygen (DO) in the MPSR. Aerobic and anaerobic zones that created appropriate conditions for simultaneous COD and nitrogen removal also formed in the MPSR. As the organic loading rate increased from 0.29 to 1.68 g COD/(L · day) over the test period, the COD removal efficiencies of the MPSR were generally 10-20 % greater than those of the SBR. In particular, the total nitrogen (TN) removal efficiencies of the MPSR and SBR were 40-50 and 20-35 %, respectively, whereas the TN concentrations in the MPSR effluent were always around 10 mg/L lower than those of the SBR. Further, because of the unique DO distribution, the bacterial species in the MPSR were more diverse and contributed to enhanced TN removal.

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Functional Redundancy of Microbial Anodes fed by Domestic Wastewater

Cited by 38 publications

References 56 publications

Estimating the Energy Content of Wastewater Using Combustion Calorimetry and Different Drying Processes

Estimating the Energy Content of Wastewater Using Combustion Calorimetry and Different Drying Processes

Is there a Specific Ecological Niche for Electroactive Microorganisms?

Improving oxygen dissolution and distribution in a bioreactor with enhanced simultaneous COD and nitrogen removal by simply introducing micro-pressure and swirl

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