Dissolved methane recovery from anaerobic effluents using hollow fibre membrane contactors

Cookney, Joanna; McLeod, Andrew J.; Mathioudakis, V.L.; Ncube, Philani; Soares, Ana; Jefferson, Bruce; McAdam, Ewan J.

doi:10.1016/j.memsci.2015.12.037

Cited by 150 publications

(119 citation statements)

References 22 publications

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“…This is mainly due to relatively low electricity prices in these regions (waterpower) [8,20−21]. Yet, it is known that dissolved methane can account for over 30%-40% of COD in or correspondingly 50% of the methane produced [30], which justifies the need of degassing the effluent after anaerobic treatment [31]. In this study, comparably low COD conversion rates to biogas were observed in the UASB.…”

Section: Methane Yield Methane Production Rate and Methane Content Imentioning

confidence: 71%

Impacts of blackwater co-digestion on biogas production in the municipal wastewater treatment sector using pilot-scale UASB and CSTR reactors

Wasielewski¹,

Morandi²,

Mouarkech³

et al. 2017

Desalination and Water Treatment

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a b s t r ac tThe performance of two pilot-scale anaerobic reactors for blackwater co-digestion was studied as an attempt to investigate the transition of current wastewater infrastructures to source-separated sanitation. The focus of this study was to assess the feasibility of blackwater co-digestion at conventional wastewater treatment plants. Two scenarios were investigated; in scenario one, blackwater was co-digested with municipal sewage sludge in a 630 L continuous stirred-tank reactor (CSTR). In scenario two, blackwater was digested alongside high-strength municipal wastewater (concentration peak) in a 720 L upflow anaerobic sludge blanket (UASB) reactor. For CSTR operation, increasing methane yields from 222 to 332 L CH 4 kg/COD removed were achieved by enhancing the blackwater fraction at the reactor inlet from 0% to 35% (% total influent load as COD BW /COD tot ). The observed COD removal ranged from 60% to 78% at 0.9-1.6 kg COD/(m³·d). For UASB operation, COD removals of 57%-67% were reported at COD loading rates of 6.1-8.4 kg/(m 3 d). Removal of organic matter was successfully carried out in both reactors, yet blackwater co-digestion alongside raw sludge (CSTR) proved to be more advantageous to the plant in terms of overall biogas production. The results also indicate that municipal digesters can be successfully integrated in transition strategies for resource-oriented sanitation, thus potentially increasing energy utilization in the plant.

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Section: Methane Yield Methane Production Rate and Methane Content Imentioning

confidence: 71%

Impacts of blackwater co-digestion on biogas production in the municipal wastewater treatment sector using pilot-scale UASB and CSTR reactors

Wasielewski¹,

Morandi²,

Mouarkech³

et al. 2017

Desalination and Water Treatment

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“…biological oxidation, air stripping, degassing membrane etc. (Bandara et al, 2011;Cookney et al, 2016;Matsuura et al, 2010;Matsuura et al, 2015). Matsuura et al (2015) developed a two-stage down-flow hanging sponge (DHS) reactor in which the majority of dissolved methane was recovered in a first DHS reactor by air gasification and the residual dissolved methane was further removed in a second DHS reactor via biological oxidation.…”

Section: Sludge Production and Recovery Of Dissolved Methanementioning

confidence: 99%

Integrated A-B processes for municipal wastewater treatment

2020

A-B Processes: Towards Energy Self-Sufficient Municipal Wastewater Treatment

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Currently, the widely adopted conventional biological processes for municipal wastewater treatment are receiving increasing attention regarding their intensive energy consumption and huge amount of sludge production. However, significant improvements in energy efficiency are unlikely to be reached via further optimization of the conventional biological processes (Wan et al., 2016). Therefore, more effort should be dedicated to the development and adoption of innovative process configurations and emerging technologies for municipal wastewater treatment. In fact, chemical oxygen demand (COD) capture from municipal wastewater is critical to move towards direct energy recovery instead of biological oxidation of COD. In Chapter 2, novel technologies that are able to capture COD for energy recovery have been presented in detail. However, these technologies could not stand alone for municipal wastewater treatment due to their ineffectiveness in nitrogen removal. As such, processes for COD capture should be integrated with processes specially designed for energy-efficient nitrogen removal, and it is this configuration which has become known as the A-B process. In the A-B process, the A-stage is designed for the capture of COD for energy recovery instead of biological oxidation, whereas the B-stage is primarily dedicated to nutrient removal or recovery (Wan et al., 2016). As shown in Figure 3.1, there seem to be various combinations of the A-B process.

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“…As noted above, methane recovery can be achieved through membrane-based techniques such as degasification non-porous membranes and membrane contactors. These systems can be modelled through a resistance-in-series model considering liquid resistance, membrane resistance and gas resistance (or controlling resistance in the case of sparingly soluble gases) (Cookney et al, 2016). The model structure and parameters can consider contributions of different factors, including circulation regime of gas and liquid, the membrane material, the transmembrane pressure, etc.…”

Section: Perspectives On Process Modellingmentioning

confidence: 99%

A review on anaerobic membrane bioreactors (AnMBRs) focused on modelling and control aspects

Robles

Ruano

Charfi

et al. 2018

Bioresource Technology

120

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The use of anaerobic membrane bioreactor technology (AnMBR) is rapidly expanding. However, depending on the application, AnMBR design and operation is not fully mature, and needs further research to optimize process efficiency and enhance applicability. This paper reviews state-of-the-art of AnMBR focusing on modelling and control aspects. Quantitative environmental and economic evaluation has demonstrated substantial advantages in application of AnMBR to domestic wastewater treatment, but detailed modelling is less mature. While anaerobic process modelling is generally mature, more work is needed on integrated models which include coupling between membrane performance (including fouling) and the biological process. This should include microbial factors, which are important to generation of specific foulants such as soluble and particulate inert organics. Mature and well-established control tools, including better feedback control strategies are also required for both the process, and for fouling control.

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Dissolved methane recovery from anaerobic effluents using hollow fibre membrane contactors

Cited by 150 publications

References 22 publications

Impacts of blackwater co-digestion on biogas production in the municipal wastewater treatment sector using pilot-scale UASB and CSTR reactors

Impacts of blackwater co-digestion on biogas production in the municipal wastewater treatment sector using pilot-scale UASB and CSTR reactors

Integrated A-B processes for municipal wastewater treatment

A review on anaerobic membrane bioreactors (AnMBRs) focused on modelling and control aspects

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