Important effects of temperature on treating real municipal wastewater by a submerged anaerobic membrane bioreactor: Removal efficiency, biogas, and microbial community

Ji, Jiayuan; Ni, Jialing; Ohtsu, Akito; Isozumi, Naoko; Hu, Yisong; Du, Runda; Chen, Yujie; Qin, Yu; Kubota, Kengo; Li, Yu You

doi:10.1016/j.biortech.2021.125306

Cited by 53 publications

(18 citation statements)

References 46 publications

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“…It was noted that the average COD removal efficiencies under 25 • C, 20 • C and 15 • C were equal to 90.0 ± 2.6%, 90.7 ± 2.6% and 84.5 ± 8.0%, respectively (Table 4). It can be inferred from these studies that the AnMBRs technology ensures a satisfactory effluent quality corresponding to the COD removal higher than 90% under the temperatures equal to and higher than 20 • C. This conclusion is in accordance with the results of another studies, wherein it was documented that, generally, at lower temperatures, the COD removal efficiencies is lower than 90% for both real [67,70,120,123,149,150,160,161] and synthetic [162] wastewaters (Table 4).…”

Section: Impact Of Temperaturesupporting

confidence: 89%

“…In literature, there is a number of studies attempted to correlate the feed temperature with the efficiency of the AnMBRs used for the treatment of municipal wastewaters. For instance, Ji et al [149] successfully applied a submerged AnMBR for the long-term treatment of real municipal wastewater (Table 3). More specifically, the system was equipped with a hollow fiber PVDF membrane with a pore size of 0.4 µm.…”

Section: Impact Of Temperaturementioning

confidence: 99%

“…The impact of average temperature and HRT on the average COD removal during treatment of real and synthetic municipal wastewaters in AnMBRs. Results presented in[70,75,115,120,123,[149][150][151][152][153][154]156,157,161,162,171,172,174,[177][178][179].…”

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confidence: 99%

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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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Section: Impact Of Temperaturesupporting

confidence: 89%

Section: Impact Of Temperaturementioning

confidence: 99%

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

Tomczak

Gryta

2022

Energies

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“…These low yields are typical of those reported elsewhere for similar systems, including 0.11 g VSS g −1 COD for low-strength synthetic wastewater treatment at 25 • C and nearinfinite SRT [74]. Ji et al [73] found sludge yields of 0.12, 0.19 and 0.388 g VSS g −1 COD rem with real municipal wastewater at SRT of 93.9, 40.3 and 20.7 days; but the effect was confounded by accompanying changes in temperature from 25 to 20 and 15 • C and the system did not operate for 3 SRT in each set of conditions. Sludge yields of 0.07-0.11 g VSS g −1 COD rem were reported using the same wastewater at 25 • C for SRT from 65 days to near-infinite with HRT from 6-12 h and OLR between 0.7-1.5 g COD L −1 day −1 [28].…”

Section: Biomass Growth and Kineticssupporting

confidence: 79%

“…The applied SRT was not reported, however, thus it is likely that this was high and determined only by the withdrawal of samples for analysis. Similar trends in EPS and soluble microbial product concentrations were observed in two hollow fibre SAnMBR fed on synthetic wastewater at 25 and 35 • C with an SRT of 370 days [72], and in a hollow fibre SAnMBR fed on municipal wastewater at 25, 20 and 15 • C at SRT of 93.9, 40.3 and 20.7 days, respectively [73], although the operating periods under each set of conditions were less than 3 SRT. Kong et al [1] operated a 5 m 3 pilot-scale SAnMBR with a HFM unit on municipal wastewater for over 200 days at 25 • C. No change in EPS concentration was observed when HRT was varied between 6-24 h, but SRT was not reported.…”

Section: Extracellular Polymeric Substancessupporting

confidence: 71%

Operation of Submerged Anaerobic Membrane Bioreactors at 20 °C: Effect of Solids Retention Time on Flux, Mixed Liquor Characteristics and Performance

2021

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Four flat-sheet submerged anaerobic membrane bioreactors ran for 242 days on a simulated domestic wastewater with low Chemical Oxygen Demand (COD) and high suspended solids. Organic loading was maintained around 1.0 g COD L−1 day−1, while solids retention time (SRT) was varied from 20–90 days. This was achieved at a constant membrane flux, maintained by adjusting transmembrane pressure (TMP) in the range 1.8-9.8 kPa. Membrane fouling was assessed based on the required TMP, with mixed liquors characterised using capillary suction time, frozen image centrifugation and quantification of extracellular polymeric substances (EPS). SRT had a significant effect on these parameters: fouling was least at an SRT of 30 days and highest at 60 days, with some reduction as this extended to 90 days. Operation at SRT <30 days showed no further benefits. Although operation at a short SRT was optimal for membrane performance it led to lower specific methane productivity, higher biomass yields and higher effluent COD. Short SRT may also have accelerated the loss of essential trace elements, leading to reduced performance under these conditions. A COD-based mass balance was conducted, including both biomass and methane dissolved in the effluent.

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Enhancing kitchen waste minimization and energy generation at 20 °C: a psychrophilic anaerobic co‐digestion study

Esparza‐Soto,

Alcaraz‐Ibarra,

Lucero‐Chavez

et al. 2023

J of Chemical Tech & Biotech

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BackgroundIn developing countries, anaerobic digestion still represents an emerging technology for solid waste management, despite the great energy potential of methane in biogas for heating purposes, especially in low‐temperature regions. This research evaluated the effect of hydraulic retention time (40–120 days) on the anaerobic co‐digestion of 35% w/w waste activated sludge and 65% w/w organic kitchen waste at a low temperature (20 °C). The anaerobic co‐digestion was conducted in five 11‐L semicontinuous anaerobic digesters. Additionally, the expected energy production from organic kitchen waste was calculated.ResultsThe specific methane yield (SMY) ranged from 0.20 to 0.27 LCH4 g‐VSadd−1, comparable to the SMY reported for meso‐ and thermophilic anaerobic digestion. Moreover, the expected energy production was 1.06 MJ day−1 of equivalent liquefied petroleum gas, which could satisfy ≤6.6% of the daily water heating requirements of an average Mexican household. The hydraulic retention time in the range of 60–120 days did not seem to significantly affect the performance of the digesters.ConclusionsThese digesters could easily be installed in low temperature regions for domestic use. The waste activated sludge substrate can be replaced with other nitrogen‐rich substances for indoor use. The data shown in this research set the basis for further investigations and domestic applications. © 2023 Society of Chemical Industry (SCI).

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Important effects of temperature on treating real municipal wastewater by a submerged anaerobic membrane bioreactor: Removal efficiency, biogas, and microbial community

Cited by 53 publications

References 46 publications

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

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

Operation of Submerged Anaerobic Membrane Bioreactors at 20 °C: Effect of Solids Retention Time on Flux, Mixed Liquor Characteristics and Performance

Enhancing kitchen waste minimization and energy generation at 20 °C: a psychrophilic anaerobic co‐digestion study

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