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Energy uncoupling 2

Membrane fouling 2

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Co-application of energy uncoupling and ultrafiltration in sludge treatment: Evaluations of sludge reduction

An Ding, Yingxue Zhao, Zhongsen Yan, Langming Bai, Haiyang Yang, Heng Liang, Guibai Li, Nanqi Ren

Frontiers of Environmental Science & Engineering 2020, Volume 14, Issue 4, doi: 10.1007/s11783-020-1238-9

Abstract: Energy uncoupling is often used for sludge reduction because it is easy to operate and does not requireultrafiltration membrane process for sludge water recovery after the sludge had undergone an energy uncouplingEnergy uncoupling was found to break apart sludge floc by reducing extracellular polymeric substancesAnalysis of supernatant indicated that when energy uncoupling and membrane filtration were co-appliedIn general, this study found that the co-application of energy uncoupling and membrane filtration processes

Keywords： Sludge reduction     Energy uncoupling     Ultrafiltration membrane     Membrane fouling    

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Comparison between inhibitor and uncoupler for minimizing excess sludge production of an activated sludge process

CHEN Guowei, XI Pengge, XU Deqian, YU Hanqing

Frontiers of Environmental Science & Engineering 2007, Volume 1, Issue 1,   Pages 63-66 doi: 10.1007/s11783-007-0012-6

Abstract: With the energy uncoupling model established in this work, energy uncoupling coefficient () was usedThe energy uncoupling coefficients in the presence of dinitrophenol (dNP), Zn, and Cu was 0.75, 0.46,

Keywords： uncoupling coefficient     Cu     minimization     presence     uncoupling    

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Metabolic uncoupler, 3,3′,4′,5-tetrachlorosalicylanilide addition for sludge reduction and fouling control in a gravity-driven membrane bioreactor

An Ding, Yingxue Zhao, Huu Hao Ngo, Langming Bai, Guibai Li, Heng Liang, Nanqi Ren, Jun Nan

Frontiers of Environmental Science & Engineering 2020, Volume 14, Issue 6, doi: 10.1007/s11783-020-1275-4

Abstract: Abstract • Effects of metabolic uncoupler TCS on the performances of GDMBR were evaluated. • Sludge EPS reduced and transformed into dissolved SMP when TCS was added. • Appropriate TCS increased the permeability and reduced cake layer fouling. • High dosage aggravated fouling due to compact cake layer with low bio-activity. The gravity-driven membrane bioreactor (MBR)system is promising for decentralized sewage treatment because of its low energy consumption and maintenance requirements. However, the growing sludge not only increases membrane fouling, but also augments operational complexities (sludge discharge). We added the metabolic uncoupler 3,3′,4′,5-tetrachlorosalicylanilide (TCS) to the system to deal with the mentioned issues. Based on the results, TCS addition effectively decreased sludge ATP and sludge yield (reduced by 50%). Extracellular polymeric substances (EPS; proteins and polysaccharides) decreased with the addition of TCS and were transformed into dissolved soluble microbial products (SMPs) in the bulk solution, leading to the break of sludge flocs into small fragments. Permeability was increased by more than two times, reaching 60–70 L/m2/h bar when 10–30 mg/L TCS were added, because of the reduced suspended sludge and the formation of a thin cake layer with low EPS levels. Resistance analyses confirmed that appropriate dosages of TCS primarily decreased the cake layer and hydraulically reversible resistances. Permeability decreased at high dosage (50 mg/L) due to the release of excess sludge fragments and SMP into the supernatant, with a thin but more compact fouling layer with low bioactivity developing on the membrane surface, causing higher cake layer and pore blocking resistances. Our study provides a fundamental understanding of how a metabolic uncoupler affects the sludge and bio-fouling layers at different dosages, with practical relevance for in situ sludge reduction and membrane fouling alleviation in MBR systems.

Keywords： Gravity-driven membrane (GDM)     Energy uncoupling     Permeability     Sludge reduction     Membrane fouling     Fouling    

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Title Author Date Type Operation

Co-application of energy uncoupling and ultrafiltration in sludge treatment: Evaluations of sludge reduction

An Ding, Yingxue Zhao, Zhongsen Yan, Langming Bai, Haiyang Yang, Heng Liang, Guibai Li, Nanqi Ren

Journal Article

Comparison between inhibitor and uncoupler for minimizing excess sludge production of an activated sludge process

CHEN Guowei, XI Pengge, XU Deqian, YU Hanqing

Journal Article

Metabolic uncoupler, 3,3′,4′,5-tetrachlorosalicylanilide addition for sludge reduction and fouling control in a gravity-driven membrane bioreactor

An Ding, Yingxue Zhao, Huu Hao Ngo, Langming Bai, Guibai Li, Heng Liang, Nanqi Ren, Jun Nan

Journal Article