Investigating the relative contribution of colloidal and soluble fractions of secondary effluent organic matter to the irreversible fouling of MF and UF hollow fibre membranes

Filloux, Emmanuelle; Gernjak, Wolfgang; Gallard, Hervé; Croué, Jean-Philippe

doi:10.1016/j.seppur.2016.06.034

Cited by 26 publications

(11 citation statements)

References 28 publications

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“…Additional images at lower magnification visualizing colloid deposition are shown in Section S14, verifying differences in the location of foulant accumulation for the two wastewaters. Our results validate earlier reports that have implicated colloidal materials as the major cause of combined fouling of UF membranes, even though their size in relation to membrane pores was not pursued. ,, Images represented by Figure d,e correspond to coagulated wastewater A and are described next in Section .…”

Section: Resultssupporting

confidence: 89%

“…Our results validate earlier reports that have implicated colloidal materials as the major cause of combined fouling of UF membranes, even though their size in relation to membrane pores was not pursued. 10,20,33 Images represented by Figure 4d,e correspond to coagulated wastewater A and are described next in Section 3.5.…”

Section: Wastewater a Was Significantly More Fouling Than Wastewater ...mentioning

confidence: 99%

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Indirect Evidence that Colloidal Deposition Inside a Hollow Fiber Ultrafiltration Membrane Exacerbated Fouling during Municipal Wastewater Reclamation

Li,

Kim,

Joag

et al. 2023

ACS EST Eng.

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Ultrafiltration (UF) or microfiltration is often employed during potable reuse for reverse osmosis pretreatment, and their own fouling from organics and colloids present in the secondary wastewater effluent remains an unresolved issue. Herein, we compared the fouling of a hollow fiber UF membrane over multiple filtration–backwashing cycles caused by two different secondary-treated effluents having similar concentrations of effluent organic matter (EfOM) and dissolved constituents but substantially different turbidity, total suspended solids (TSS), and particle size distributions. Contrary to expectations, significantly worse fouling was caused by the less turbid (low TSS) wastewater, which was explained by the presence of particles that were smaller than the membrane pores. In this case, pore plugging was the dominant fouling mechanism, which was mechanistically quantified as “standard blocking,” i.e., colloid deposition inside the pores. On the other hand, fouling was negligible for the more turbid (high TSS) wastewater that contained particles larger than the pores. In this case, surface accumulation of colloids blocked pores, which was mechanistically quantified as “intermediate blocking.” Hence, the location of particle deposition was a crucial determinant of ultrafilter productivity when colloids combined with EfOM to (ir)reversibly foul membranes operating on real-world secondary effluents. Additionally, pretreatment by electrocoagulation and conventional coagulation mitigated (ir)reversible fouling by creating large flocs that deposited on the membrane surface, (i) allowing facile backwashing (i.e., reduced irreversible fouling) and (ii) forming a more permeable cake layer (i.e., reduced reversible fouling). Hence, UF productivity was primarily determined by colloid size relative to pore size in conjunction with secondary contributions from EfOM. Importantly, internal pore fouling within the membrane’s polymer matrix was more difficult to alleviate by hydraulic backwashing than by surface deposition.

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Section: Resultssupporting

confidence: 89%

Section: Wastewater a Was Significantly More Fouling Than Wastewater ...mentioning

confidence: 99%

Indirect Evidence that Colloidal Deposition Inside a Hollow Fiber Ultrafiltration Membrane Exacerbated Fouling during Municipal Wastewater Reclamation

Li,

Kim,

Joag

et al. 2023

ACS EST Eng.

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“…WRPs are constructed with the objective of reusing wastewater for different purposes, such as recreational, agricultural, or industrial purposes [ 9 ]. Thus, MS is often used as a tertiary treatment to produce high-quality water that is suitable for recycling or reclamation after removing organic contaminants, suspended solids, and other substrates by biological treatment [ 10 ]. However, MS often suffers from its own “Achilles heel”.…”

Section: Coupling Ms and Eaops As A Combined Processmentioning

confidence: 99%

Membrane Separation Coupled with Electrochemical Advanced Oxidation Processes for Organic Wastewater Treatment: A Short Review

et al. 2020

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Research on the coupling of membrane separation (MS) and electrochemical advanced oxidation processes (EAOPs) has been a hot area in water pollution control for decades. This coupling aims to greatly improve water quality and focuses on the challenges in practical application to provide a promising solution to water shortage problems. This article provides a summary of the coupling configurations of MS and EAOPs, including two-stage and one-pot processes. The two-stage process is a combination of MS and EAOPs where one process acts as a pretreatment for the other. Membrane fouling is reduced when setting EAOPs before MS, while mass transfer is promoted when placing EAOPs after MS. A one-pot process is a kind of integration of two technologies. The anode or cathode of the EAOPs is fabricated from porous materials to function as a membrane electrode; thus, pollutants are concurrently separated and degraded. The advantages of enhanced mass transfer and the enlarged electroactive area suggest that this process has excellent performance at a low current input, leading to much lower energy consumption. The reported conclusions illustrate that the coupling of MS and EAOPs is highly applicable and may be widely employed in wastewater treatment in the future.

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“…This could be caused by the variations of microorganisms bioactivity in seawater which was related to organics photolysis resulting in a series of radical and fragmentation reactions (Jeong, Naidu et al 2016). Moreover, the oxidation processes could also break down the organics from large MW to smaller MW (Filloux, Gernjak et al 2016). In contrast to wastewater or river water, BP was present at a low concentration in seawater, thus large volume of seawater (~1200 L) was required for the isolation process to collect sufficient amount of BP.…”

Section: Seawater Compositionsmentioning

confidence: 99%

Membrane fouling in seawater reverse osmosis (SWRO) desalination process

Yin¹

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I would like to express my greatest appreciation to my supervisor and mentor Professor Chong Tzyy Haur. Professor Chong provided me many helps and supports in my research study all the time. I would like to express my sincere gratitude to his patience and motivation. He kept guiding me to the correct direction, and leading me to learn more knowledge in the current research field. I benefited a lot from his openminded view, abundant research knowledge, rigorous academic style, and outstanding academic spirit. Besides my supervisor, I would like to thank my co-mentor Professor Emile R. Cornelissen. He kept guiding me during my PhD life. He always gave me useful advice of my research work, and made my research more rigorous. At the same time, I am also very grateful to Dr. Stanislaus Raditya Suwarno, who provided me many supports when I started my PhD. Thanks to him, I am able to master the experimental setup and analytical instrument. Furthermore, I can transport the skill to others. Also, many thanks go to my colleagues Miss. Tan Hwee Sin who has helped me a lot in the experiment designs and sample preparation in my study. Special thanks to Dr. Li Xin for his patient and kind help. He gave me the greatest help at the most confused stage of my PhD. He was sharing his full experience of research and writing skill to me which helped me to avoid many mistakes and saved lots of time and energy. At the same time, I also want to specially thank to Dr. Ho Jia Shin and Dr. Sim Lee Nuang for their sincere supports and guidance in my PhD study. My appreciation also goes to all the staffs and students from Singapore Membrane Technology Centre (SMTC). I also appreciate that the support from school of Civil & Environmental Engineering (CEE), NTU. Thanks for funding me and support me on my research. Last but not the least, I would like to acknowledge my parents and my girlfriend Miss. Wu who keep encouraging me and motivating me all the time in my whole PhD life.

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Investigating the relative contribution of colloidal and soluble fractions of secondary effluent organic matter to the irreversible fouling of MF and UF hollow fibre membranes

Cited by 26 publications

References 28 publications

Indirect Evidence that Colloidal Deposition Inside a Hollow Fiber Ultrafiltration Membrane Exacerbated Fouling during Municipal Wastewater Reclamation

Indirect Evidence that Colloidal Deposition Inside a Hollow Fiber Ultrafiltration Membrane Exacerbated Fouling during Municipal Wastewater Reclamation

Membrane Separation Coupled with Electrochemical Advanced Oxidation Processes for Organic Wastewater Treatment: A Short Review

Membrane fouling in seawater reverse osmosis (SWRO) desalination process

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