Application of hybrid coagulation microfiltration with air backflushing to direct sewage concentration for organic matter recovery

Jin, Zhengyu; Gong, Hui; Wang, Kaijun

doi:10.1016/j.jhazmat.2014.10.038

Cited by 51 publications

(6 citation statements)

References 31 publications

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“…In this respect, regardless of the different operating conditions tested, severe fouling evolution was observed when using the MF membrane for filtering MWW. A similar performance has been reported in several studies when operating submerged membranes (see, for instance, [ 18 , 26 , 27 ]), requiring specific fouling control strategies in cited works to dilate filtration (such as coagulant dosing, intensive air sparging or enhanced backwashing). Nonetheless, several studies have demonstrated the potential of MF membranes for MWW treatment when operating in side-stream configuration, where longer filtrations are possible by controlling membrane fouling through cross-flow physical cleaning [ 28 ].…”

Section: Resultssupporting

confidence: 77%

Direct Membrane Filtration of Municipal Wastewater: Studying the Most Suitable Conditions for Minimizing Fouling Rate in Commercial Porous Membranes at Demonstration Scale

et al. 2023

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This study aimed to evaluate the feasibility of applying a commercial porous membrane to direct filtration of municipal wastewater. The effects of membrane pore size (MF and UF), treated influent (raw wastewater and the primary settler effluent of a municipal wastewater treatment plant) and operating solids concentration (about 1 and 2.6 g L−1) were evaluated on a demonstration plant. Filtration periods of 2–8 h were achieved when using the MF membrane, while these increased to 34–69 days with the UF membrane. This wide difference was due to severe fouling when operating the MF membrane, which was dramatically reduced by the UF membrane. Use of raw wastewater and higher solids concentration showed a significant benefit in the filtration performance when using the UF module. The physical fouling control strategies tested (air sparging and backwashing) proved to be ineffective in controlling UF membrane fouling, although these strategies had a significant impact on MF membrane fouling, extending the operating period from some hours to 5–6 days. The fouling evaluation showed that a cake layer seemed to be the predominant reversible fouling mechanism during each independent filtration cycle. However, as continuous filtration advanced, a large accumulation of irreversible fouling appeared, which could have been related to intermediate/complete pore blocking in the case of the MF membrane, while it could have been produced by standard pore blocking in the case of the UF membrane. Organic matter represented more than 70% of this irreversible fouling in all the experimental conditions evaluated.

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Section: Resultssupporting

confidence: 77%

Direct Membrane Filtration of Municipal Wastewater: Studying the Most Suitable Conditions for Minimizing Fouling Rate in Commercial Porous Membranes at Demonstration Scale

et al. 2023

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“…Recently, the interest of the scientific community has aroused due to the advantages that integration of DMF with subsequent anaerobic digestion offer. Combination of both treatments allows getting high-quality effluents and high-strength water streams by the up-concentration of the organic matter. − Therefore, the aim of the process is not only recovering the water resources but also the carbon and the nutrients present in the wastewater. Several authors have proved the process feasibility, recovering ∼75% of the organic matter. , However, the main drawback of this wastewater treatment scheme relies on severe membrane fouling, which decreases the process performance and requires intensive use of chemicals, reducing membrane lifespan …”

Section: Introductionmentioning

confidence: 99%

A Rotating Hollow Fiber Module for Fouling Control in Direct Membrane Filtration of Primary Settled Wastewater

Ruigómez

Cabrera

Galán

et al. 2019

Ind. Eng. Chem. Res.

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Direct membrane filtration (DMF) has emerged as an attractive option to treat municipal wastewater; however, this technology suffers from severe membrane fouling. In this paper, a rotating hollow fiber module for enhancing the fouling control is proposed. The experimental study was conducted at lab scale, filtering a primary settled municipal wastewater. The effectiveness of this technology coupled with physicochemical pretreatment was also evaluated. Results showed the existence of a threshold permeate flux (32–36 L/h·m2), below which the shear rates exerted by membrane rotation prevented supramicron size particle deposition, regardless of the application of physicochemical pretreatment, even at low rotational speeds (w = 120 rpm). At higher fluxes (40–48 L/h·m2), the rotational speed had to be increased to 340 rpm to achieve sustainable conditions. Even when applying physicochemical pretreatment, the internal residual fouling was found to be the main fouling contribution, probably associated with the submicron particles.

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“…As the process goes on, the cake layer thickness becomes progressively exacerbated, resulting in a relentless increase of filtration resistance and in turn hindering the rise in production capacity. Effective methods for reducing particle fouling and restoring the filtration performance of filter tubes include back-flushing, , chemical cleaning, and ultrasonication. , Among them, back-flushing is widely recognized as the most effective online approach for restoring filtration performance in various application fields. ,− Consequently, the successful adoption of appropriate back-flushing strategies is of great pertinence in the industrial F-T plants for the acceleration and effectiveness of in-vessel filter regeneration.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Back-Flushing Characteristics of an In-Vessel Filtration System in Fischer–Tropsch Slurry Reactors

Gu,

Zhang,

et al. 2023

Ind. Eng. Chem. Res.

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An in-vessel filtration system is a crucial component in commercial low-temperature Fischer–Tropsch slurry reactors for the continuous separation of liquid products and catalysts generated by the reaction. Periodic back-flushing is key to ensuring the stability and continuity of the in-vessel filtration system, but it has been relatively unexplored. In this study, systematically and experimentally, the back-flushing characteristics of in-vessel filtration are investigated, including the characteristics of the back-flushing process, the influence of back-flushing conditions on the recovery of filtration performance, and some inherent issues for back-flushing. The results indicate that the in-vessel filtration back-flushing process exhibits four typical stages: pre-back-flushing stage I, back-flushing stage II, back-flushing buffering stage III, and reuse stage IV. In stage II, the process lasts longer due to the incompressibility of the liquid, and it also has a certain entrainment effect on particles. In stage III, the remaining liquid level after liquid back-flushing can inhibit the inflow of liquid, partially preventing a premature decline in filtration performance. As a result, the recovery of filtration performance following liquid back-flushing is superior to that of gas. There exists a threshold value for both gas and liquid back-flushing differential pressures, beyond which there is no significant improvement in filtration performance. The recovery of filtration performance varies significantly along the filter tube height due to differences in flow resistance. During gas back-flushing, the impact of high-pressure gas on the bed causes significant pressure fluctuations, affecting the operational stability of the slurry reactor. Residual particles that cannot be fully removed by back-flushing exist in the filter tube gaps, and their gradual accumulation is one of the main causes of filter failure. These findings contribute to a better understanding of in-vessel filtration back-flushing and help in the development of improved back-flushing schemes for industrial plants.

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Application of hybrid coagulation microfiltration with air backflushing to direct sewage concentration for organic matter recovery

Cited by 51 publications

References 31 publications

Direct Membrane Filtration of Municipal Wastewater: Studying the Most Suitable Conditions for Minimizing Fouling Rate in Commercial Porous Membranes at Demonstration Scale

Direct Membrane Filtration of Municipal Wastewater: Studying the Most Suitable Conditions for Minimizing Fouling Rate in Commercial Porous Membranes at Demonstration Scale

A Rotating Hollow Fiber Module for Fouling Control in Direct Membrane Filtration of Primary Settled Wastewater

Experimental Study on Back-Flushing Characteristics of an In-Vessel Filtration System in Fischer–Tropsch Slurry Reactors

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