Evaluation of anaerobic membrane bioreactor (AnMBR) treating confectionery wastewater at long-term operation under different organic loading rates: Performance and membrane fouling

Balcıoğlu, Gökhan; Yılmaz, Gülsüm; Gönder, Z. Beril

doi:10.1016/j.cej.2020.126261

Cited by 58 publications

(37 citation statements)

References 77 publications

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“…Other recent studies (2020-2021) used AnMBR technology to treat real industrial wastewater. Table 2 shows their performances [20,21,22,23]. The performance achieved in our study based on the OLR is higher than in most studies shown.…”

Section: Performance Comparison With Recent Studies Using Anmbrmentioning

confidence: 58%

Excellent performance of anaerobic membrane bioreactor in treatment of distillery wastewater at pilot scale

Deschamps

Merlet²,

Lemaire

et al. 2021

Journal of Water Process Engineering

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Section: Performance Comparison With Recent Studies Using Anmbrmentioning

confidence: 58%

Excellent performance of anaerobic membrane bioreactor in treatment of distillery wastewater at pilot scale

Deschamps

Merlet²,

Lemaire

et al. 2021

Journal of Water Process Engineering

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“…The results are very well in agreement with the literature on COD removal by AnMBRs with a minimum of 67% been reported for wastewaters from the food industry (Dvorák et al, 2016 ). The COD removal efficiency typically depends on the OLR of the reactor (Balcioǧlu et al, 2021 ). From the literature it can be gathered that AnMBRs can operate at varied OLRs, with low OLR providing better pollutant removal at higher biomass concentration in the reactor and high OLRs favoring stabilized treatment efficiency with active biomass retained by the membranes (Balcioǧlu et al, 2021 ).…”

Section: Discussionmentioning

confidence: 99%

“…The COD removal efficiency typically depends on the OLR of the reactor (Balcioǧlu et al, 2021 ). From the literature it can be gathered that AnMBRs can operate at varied OLRs, with low OLR providing better pollutant removal at higher biomass concentration in the reactor and high OLRs favoring stabilized treatment efficiency with active biomass retained by the membranes (Balcioǧlu et al, 2021 ). Wijekoon et al ( 2011 ) reported that the COD removal efficiency increased with OLR reaching a maximum removal efficiency of 80% at an OLR of 8.0 (± 0.3) g COD/L d, but decreased to almost 60% at an OLR of 12.0 (± 0.2) g COD/L d when treating a synthetic wastewater using a thermophilic AnMBR.…”

Section: Discussionmentioning

confidence: 99%

Performance of AnMBR in Treatment of Post-consumer Food Waste: Effect of Hydraulic Retention Time and Organic Loading Rate on Biogas Production and Membrane Fouling

Ariunbaatar

Bair

Özcan

et al. 2021

Front. Bioeng. Biotechnol.

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Anaerobic digestion of food waste (FW) is typically limited to large reactors due to high hydraulic retention times (HRTs). Technologies such as anaerobic membrane reactors (AnMBRs) can perform anaerobic digestion at lower HRTs while maintaining high chemical oxygen demand (COD) removal efficiencies. This study evaluated the effect of HRT and organic loading rate (OLR) on the stability and performance of a side-stream AnMBR in treating diluted fresh food waste (FW). The reactor was fed with synthetic FW at an influent concentration of 8.24 (± 0.12) g COD/L. The OLR was increased by reducing the HRT from 20 to 1 d. The AnMBR obtained an overall removal efficiency of >97 and >98% of the influent COD and total suspended solids (TSS), respectively, throughout the course of operation. The biological process was able to convert 76% of the influent COD into biogas with 70% methane content, while the cake layer formed on the membrane gave an additional COD removal of 7%. Total ammoniacal nitrogen (TAN) and total nitrogen (TN) concentrations were found to be higher in the bioreactor than in the influent, and average overall removal efficiencies of 17.3 (± 5) and 61.5 (± 3)% of TAN and TN, respectively, were observed with respect to the bioreactor concentrations after 2 weeks. Total phosphorus (TP) had an average removal efficiency of 40.39 (± 5)% with respect to the influent. Membrane fouling was observed when the HRT was decreased from 7 to 5 d and was alleviated through backwashing. This study suggests that the side-stream AnMBR can be used to successfully reduce the typical HRT of wet anaerobic food waste (solids content 7%) digesters from 20 days to 1 day, while maintaining a high COD removal efficiency and biogas production.

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“…The SMP in the retentates were measured for obtaining the SMP in four ranges of molecular weight: MW < 1 kDa, 1 kDa < MW < 10 kDa, 10 kDa < MW < 100 kDa, and MW > 100 kDa. The calculations based on COD mass balance are shown in Equations (4) to (7).…”

Section: Smp Molecular Weight Distributionmentioning

confidence: 99%

“…MW > 100 kDa = 0.02 × SMP ret 100 kDa (7) where SMP sol (mg COD/L) is the SMP content in the initial 30 mL sample, and SMP ret (mg COD/L) is from the 20 mL retentate obtained in each ultrafiltration; to calculate SMP, measurements of COD, VFAs, carbohydrates, and proteins were required, according to the definition given previously.…”

Section: Smp Molecular Weight Distributionmentioning

confidence: 99%

SMP Production in an Anaerobic Submerged Membrane Bioreactor (AnMBR) at Different Organic Loading Rates

et al. 2020

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Anaerobic membrane bioreactors (AnMBRs) have demonstrated an excellent capability to treat domestic wastewater. However, biofouling reduces membrane permeability, increasing operational costs and overall energy demand. Soluble microbial products (SMPs) that build up on the membrane surface play a significant role in the biofouling. In this study, the production of SMPs in a 32 L submerged AnMBR operated at three different organic loads (3.0, 4.1 and 1.2 kg chemical oxygen demand (COD)/m3d for phases 1, 2 and 3, respectively) during long-term operation of the reactor (144, 83 and 94 days) were evaluated. The samples were taken from both the permeate and the sludge at three different heights (0.14, 0.44 and 0.75 m). Higher production of SMPs was obtained in phase 2, which was proportional to the membrane fouling. There were no statistically significant differences (p > 0.05) in the SMPs extracted from sludge at different heights among the three phases. In the permeate of phases 1, 2 and 3, the membrane allowed the removal of 56%, 70% and 64% of the SMP concentration in the sludge. SMPs were characterized by molecular weight (MW). A bimodal behavior was obtained, where fractions prevailed with an MW < 1 kDa, associated with SMPs as utilization-associated products (UAPs) caused fouling by the pore-blocking mechanism. The chemical analysis found that, in the SMPs, the unknown COD predominated over the known COD, such as carbohydrates and proteins. These results suggest that further studies in SMP characterization should focus on the unknown COD fraction to understand the membrane fouling in AnMBR systems better.

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Evaluation of anaerobic membrane bioreactor (AnMBR) treating confectionery wastewater at long-term operation under different organic loading rates: Performance and membrane fouling

Cited by 58 publications

References 77 publications

Excellent performance of anaerobic membrane bioreactor in treatment of distillery wastewater at pilot scale

Excellent performance of anaerobic membrane bioreactor in treatment of distillery wastewater at pilot scale

Performance of AnMBR in Treatment of Post-consumer Food Waste: Effect of Hydraulic Retention Time and Organic Loading Rate on Biogas Production and Membrane Fouling

SMP Production in an Anaerobic Submerged Membrane Bioreactor (AnMBR) at Different Organic Loading Rates

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