Exploring the limits of anaerobic biodegradability of urban wastewater by AnMBR technology

Seco, A.; Mateo, O.; Zamorano-López, N.; Sanchis-Perucho, Pau; Serralta, J.; Martí, N.; Borrás, L.; Ferrer, J.

doi:10.1039/c8ew00313k

Cited by 22 publications

(21 citation statements)

References 32 publications

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“…The average dissolved methane removal efficiency with conditions of 0.55 m 3 m –2 d –1 of normalized flow and 44 mmHg of absolute pressure was 79 ± 2%. Despite being subjected to seasonal variations, the results were similar to those observed in an upflow anaerobic sludge blanket (UASB) reactor study (68 ± 7%) and in a temperature-controlled pilot-scale AnMBR study (67%). ,, In this study, removal efficiencies up to 66% were observed during tests in the summer, whereas removal efficiencies up to 83% were observed in the fall and winter. This difference may have been due to further optimization of the membrane contactor setup rather than an effect of seasonal variations, however.…”

Section: Resultssupporting

confidence: 85%

“…Psychrophilic temperature operation of anaerobic technologies leads to a potentially significant fraction of the total methane remaining dissolved in the membrane permeate. While various factors including temperature, COD, methane supersaturation, and ultrafiltration (UF) membrane operating conditions affect the fraction of total methane that is dissolved, several bench and pilot-scale AnMBRs have reported that greater than 40% of the total methane generated was dissolved in the permeate when operating below 25 °C. − Left unaddressed, the dissolved methane runs the risk of escaping to the atmosphere where it may act as a greenhouse gas (GHG) with a global warming potential (GWP) 25 times more potent than CO 2 . , In addition to limiting its impact on the environment, recovering dissolved methane can further drive the system toward energy neutrality. Several dissolved methane recovery technologies have been proposed as possible solutions including biological oxidation and air stripping, but separation by membrane contactor in particular has been noted for its low energy requirements and the potential to recover the methane in a form suitable for use as a fuel. ,,, …”

Section: Introductionmentioning

confidence: 99%

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Long-Term Performance of a Pilot-Scale Gas-Sparged Anaerobic Membrane Bioreactor under Ambient Temperatures for Holistic Wastewater Treatment

Lim

Evans

Parameswaran

2019

Environ. Sci. Technol.

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Concerns regarding ambient temperature operation, dissolved methane recovery, and nutrient removal have limited the implementation of anaerobic membrane bioreactors (AnMBRs) for domestic wastewater treatment. This study addresses these challenges using a pilot-scale gassparged AnMBR, with post-treatment recovery of dissolved methane and nutrients. Operating under ambient temperatures for 472 days, the AnMBR achieved an average effluent quality of 58 ± 27 mg/L COD and 25 ± 12 mg/L BOD 5 at temperatures ranging from 12.7 to 31.5 °C. The average total methane yield was 0.14 ± 0.06 L-CH 4 /g-COD fed, with 42% of the total methane dissolved in the permeate. Dissolved methane removal using a hollow fiber membrane contactor achieved an average removal efficiency of 70 ± 5%, producing effluent dissolved methane concentrations of 3.8 ± 0.94 mg/L. The methane recovered from gaseous and dissolved fractions could generate an estimated 72.8% of the power required for energy neutrality. Nutrient recovery was accomplished using coagulation, flocculation, and sedimentation for removal of sulfide and phosphorus, followed by a clinoptilolite ion-exchange column for removal of ammonia, producing effluent concentrations of 0.7 ± 1.7 mg-S/L, 0.43 ± 0.29 mg-P/L and 0.05 ± 0.05 mg-N/L. The successful integration of AnMBRs in a treatment train that addresses the critical challenges of dissolved methane and nutrients demonstrates the viability of the technology in achieving holistic wastewater treatment.

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Section: Resultssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Long-Term Performance of a Pilot-Scale Gas-Sparged Anaerobic Membrane Bioreactor under Ambient Temperatures for Holistic Wastewater Treatment

Lim

Evans

Parameswaran

2019

Environ. Sci. Technol.

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“…Therefore, CH 4 can be recovered (both as biogas and dissolved in effluent) and be used to cover a part of the energy demand of the treatment process, leading to a need to meet little or no energy requirements [172,177]. Seco et al [153] demonstrated that considering the calorific power of methane (38,000 KJ/m 3 ) and the typical efficiency of a combined heat and power device (35%), the specific energy produced by the biogas in the AnMBR pilot plant would be 0.073 kWh/m 3 of treated water. In another study [156], it was found that the energy recovered from both biogas and dissolved CH 4 produced in the AnMBR used for the treatment of municipal wastewater can be up to 0.347-0.389 kWh/m 3 .…”

Section: Energy Demandmentioning

confidence: 99%

Energy-Efficient AnMBRs Technology for Treatment of Wastewaters: A Review

Tomczak

Gryta

2022

Energies

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In recent years, anaerobic membrane bioreactor (AnMBRs) technology, a combination of a biological reactor and a selective membrane process, has received increasing attention from both industrialists and researchers. Undoubtedly, this is due to the fact that AnMBRs demonstrate several unique advantages. Firstly, this paper addresses fundamentals of the AnMBRs technology and subsequently provides an overview of the current state-of-the art in the municipal and domestic wastewaters treatment by AnMBRs. Since the operating conditions play a key role in further AnMBRs development, the impact of temperature and hydraulic retention time (HRT) on the AnMBRs performance in terms of organic matters removal is presented in detail. Although membrane technologies for wastewaters treatment are known as costly in operation, it was clearly demonstrated that the energy demand of AnMBRs may be lower than that of typical wastewater treatment plants (WWTPs). Moreover, it was indicated that AnMBRs have the potential to be a net energy producer. Consequently, this work builds on a growing body of evidence linking wastewaters treatment with the energy-efficient AnMBRs technology. Finally, the challenges and perspectives related to the full-scale implementation of AnMBRs are highlighted.

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“…Another important factor in the development of this technology is the latest stringent regulations imposed for environmental discharge worldwide, the reduction in membrane cost, the continuous improvement in process design, and requirements of high-quality water reuse applications [2]. The anaerobic membrane bioreactor (AnMBR) is a consolidated technology for the wastewater management and treatment [3,4]. Several studies for urban and industrial wastewater treatment have already been carried out, showing significant efficiency improvements compared to conventional activated sludge treatment [5].…”

Section: Introductionmentioning

confidence: 99%

Anaerobic membrane reactor: Biomethane from chicken manure and high-quality effluent

Busato

Ros

Pellay³

et al. 2020

Renewable Energy

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Chicken manure was treated in a pilot scale reactor anaerobic membrane bioreactor constituted by a completely mixed reactor combined with an ultrafiltration tube-shaped membrane in a side-stream configuration. The process operated under mesophilic condition and the inhibition of high concentration of ammonia was avoided using an ammonia stripping system. The experimental plan included a preliminary evaluation, where organic loading rates between 1.0 and 7.6 kgVS/m3/day were tested. The organic load higher than 4 kgVS/m3/d caused the accumulation of volatile fatty acids and process instability. Application of the ammonia stripping was also evaluated. The best performances were achieved using a retention time of 21 days, an organic load between 1.4 and 2.0 kgVS/m3/d, and the recirculation of stripped permeate. Reduction of the ammonia permeate content by 90% through stripping and utilization of a mixture of chicken manure/water/permeate in a ratio of 0.22/0.72/0.72 w/w led to a specific biogas production of 0.59 m3biogas/kgVS and methane content of 66e69%. The ammonia thus removed can be recovered by sulphuric acid treatment as ammonium sulphate, which can be used as a fertilizer. The proposed configuration allowed satisfactory biogas production with appropriate methane percentages, recovery of ammonium sulphate, and a high-quality effluent.

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Exploring the limits of anaerobic biodegradability of urban wastewater by AnMBR technology

Abstract: Anaerobic membrane bioreactors (AnMBRs) can achieve maximum energy recovery from urban wastewater (UWW) by converting influent COD into methane.

Cited by 22 publications

References 32 publications

Long-Term Performance of a Pilot-Scale Gas-Sparged Anaerobic Membrane Bioreactor under Ambient Temperatures for Holistic Wastewater Treatment

Long-Term Performance of a Pilot-Scale Gas-Sparged Anaerobic Membrane Bioreactor under Ambient Temperatures for Holistic Wastewater Treatment

Energy-Efficient AnMBRs Technology for Treatment of Wastewaters: A Review

Anaerobic membrane reactor: Biomethane from chicken manure and high-quality effluent

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