The effects of biocarriers on the mixed liquor characteristics, extracellular polymeric substances, and fouling rates of a hybrid membrane bioreactor

Palmarin, Matthew J.; Young, Stephanie

doi:10.1016/j.bej.2018.10.027

Cited by 19 publications

(6 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The cake layer resistance (Rc) of CMBR and BMBR is the key element of the filtration resistance. This is consistent with previous studies which also suggested that the membrane sludge cake layer representing the reversible fouling dominates the membrane filtration resistance [ 50 , 51 ]. The lower Rp/Rt from BMBR compared to CMBR was observed, indicating that BMBR exhibited lower irreversible fouling caused by pore clogging owing to the lower SMP concentration [ 51 ].…”

Section: Resultssupporting

confidence: 93%

Biochar Addition in Membrane Bioreactor Enables Membrane Fouling Alleviation and Nitrogen Removal Improvement for Low C/N Municipal Wastewater Treatment

Wang

Shen

et al. 2023

Membranes

View full text Add to dashboard Cite

Membrane bioreactors (MBRs) are frequently used to treat municipal wastewater, but membrane fouling is still the main weakness of this technology. Additionally, the low carbon-nitrogen (C/N) ratio influent has been shown to not only increase the membrane fouling, but also introduce challenges to meet the effluent discharge standard for nitrogen removal. Herein, the authors addressed the challenges by adding cost-effective biochar. The results suggested that the biochar addition can enable membrane fouling alleviation and nitrogen removal improvement. The reduced membrane fouling can be ascribed to the biochar adsorption capacity, which facilitates to form bigger flocs with carbon skeleton in biochar as a core. As a result, the biochar addition significantly altered the mixed liquor suspension with soluble microbial product (SMP) concentration reduction of approximately 14%, lower SMP protein/polysaccharide ratio from 0.28 ± 0.02 to 0.22 ± 0.03, smaller SMP molecular weight and bigger sludge particle size from 67.68 ± 6.9 μm to 113.47 ± 4.8 μm. The nitrogen removal is also dramatically improved after biochar addition, which can be due to the initial carbon source release from biochar, and formation of aerobic–anaerobic microstructures. Microbial diversity analysis results suggested more accumulation of denitrification microbes including norank_f__JG30-KF-CM45 and Plasticicumulans. Less relative abundance of Aeromonas after biochar addition suggested less extracellular polymer substance (EPS) secretion and lower membrane fouling rate.

show abstract

Section: Resultssupporting

confidence: 93%

Biochar Addition in Membrane Bioreactor Enables Membrane Fouling Alleviation and Nitrogen Removal Improvement for Low C/N Municipal Wastewater Treatment

Wang

Shen

et al. 2023

Membranes

View full text Add to dashboard Cite

show abstract

“…We used the composition of the microbial communities to determine whether different C/N ratios of influent water can affect the proportion of functional microorganisms in the process. The R1 reactor was started by gradually increasing the influent C/N ratio, while the R2 reactor used wastewater with a high C/N ratio of 20 during start-up, which might be the reason that caused the differences of the microbial community structure [40][41][42]. As shown in Table 1, the data indicated that R1 had higher microbial diversity and richness than R2.…”

Section: Discussionmentioning

confidence: 99%

Effects of Stepwise Adjustment of C/N during the Start-Up of Submerged Membrane Bioreactors (SMBRs) on the Aerobic Denitrification of Wastewater

Zhang

Fang

Wang

et al. 2021

Water

View full text Add to dashboard Cite

Based on the improved high-efficiency sewage treatment performance of submerged membrane bioreactors (SMBRs), we focused on how to adjust the C/N ratio of the influent water during reactor start-up to prevent an excessive C/N ratio from causing membrane fouling. In this study, an experimental method of gradually adjusting the influent C/N ratio to quickly start the reactor was proposed, and the results showed that biofilm formation in R1 (SMBR, three influent C/N ratios of 5, 10, and 20) was approximately completed in 32 days, shorter than that (40 days) required in R2 (SMBR, influent C/N ratio of 20). Higher removal efficiencies of 76.4% for TN, 70.1% for COD, and 79.2% for NH3-N were obtained in R1 than in R2. The high-throughput sequencing results indicated that after 150 days of operation, the Shannon index of bacteria in R1 increased from 2.97 to 4.41 and the growth of Nakamurella, Ferruginibacter, and Rhodanobacter was promoted in the reactor, which indicated substantial microbial diversity in the biofilm. Therefore, gradually adjusting the influent C/N ratio could effectively enhance the nitrogen removal performance of denitrification microbial communities in SMBRs. This study offers a reliable approach for starting the SMBR-enhanced biological nutrient removal process in wastewater treatment plants by gradually adjusting the influent C/N ratio.

show abstract

“…Therefore, reducing membrane fouling is one of the top priorities in enhancing MBR performance. In order to understand and control membrane fouling, a number of studies have been conducted (Han et al , 2018; Palmarin and Young, 2019).…”

Section: Introductionmentioning

confidence: 99%

Comparative study of suspended and attached growth in membrane bioreactors for wastewater treatment

Ibrahim

Sabeen

Noor

et al. 2019

Water & Environment J

View full text Add to dashboard Cite

The performance of laboratory scale experiments in treating synthetic domestic wastewater were conducted with suspended growth (SG) (without media) and attached growth (AG) (with moving media) membrane bioreactors (MBRs). The aim of this study is to compare fouling and the treatment performance of attached growth membrane bioreactor (AGMBR) with suspended growth membrane bioreactor (SGMBR) by assessing the removal of chemical oxygen demand (COD), nitrate, nitrite and ammonia. The finding shows that with 10% of attached growth media, average COD, nitrate, nitrite and nitrogen ammonia removal efficiency for AGMBR were found to be greater than the SGMBR system. AGMBR significantly increased critical flux, (J c) up to 48 L m −2 h −1 , hence producing low final transmembrane pressure (TMP) after cleaning and decreased the total resistance at 5.69 × 10 11 m −1. Addition of cylindrical polythene media resulted in slow TMP increment that prolonged filtration process. In conclusion, AGMBR gave a better treatment performance and could minimize the membrane fouling problem.

show abstract

The effects of biocarriers on the mixed liquor characteristics, extracellular polymeric substances, and fouling rates of a hybrid membrane bioreactor

Cited by 19 publications

References 40 publications

Biochar Addition in Membrane Bioreactor Enables Membrane Fouling Alleviation and Nitrogen Removal Improvement for Low C/N Municipal Wastewater Treatment

Biochar Addition in Membrane Bioreactor Enables Membrane Fouling Alleviation and Nitrogen Removal Improvement for Low C/N Municipal Wastewater Treatment

Effects of Stepwise Adjustment of C/N during the Start-Up of Submerged Membrane Bioreactors (SMBRs) on the Aerobic Denitrification of Wastewater

Comparative study of suspended and attached growth in membrane bioreactors for wastewater treatment

Contact Info

Product

Resources

About