Effect of pre-ozonation on mitigation of ceramic UF membrane fouling caused by algal extracellular organic matters

Wei, Dequan; Tao, Yi; Zhang, Zhenghua; Zhang, Xihui

doi:10.1016/j.cej.2016.02.110

Cited by 119 publications

(15 citation statements)

References 30 publications

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“…Under-stoichimetric ozone treatment seems to result in an oxidative disintegration of the long-chained structure of biopolymers, i.e., polysaccharides. This is in good accordance with HPSEC-analyses of an algae suspension, where a reduction of biopolymers (10,000-100,000 Da) towards substances with molecular weights of 1000-10,000 Da was observed [21].…”

Section: Influence Of Ozone On Fluid Propertiessupporting

confidence: 90%

“…Ozone treatment of biological suspensions generally results in a disruption of organic compounds. Uzun et al (2012) investigated the influence of ozone on functional properties of proteins [20], while Wei et al (2016) observed a dramatic decrease of biopolymer substances in algae suspensions from approximately 50,000 Da to 1000-10,000 Da after ozonation [21]. In wastewater treatment applications, ozone treatment is applied to alter activated sludge properties [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Ozone Treatment on Ultrafiltration Performance and Nutrient Flow in a Membrane Based Nutrient Recovery Process from Anaerobic Digestate

Gienau¹,

Ehrmanntraut

Kraume

et al. 2020

Membranes

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Membrane filtration of biological suspensions is frequently limited by fouling. This mechanism is well understood for ultrafiltration of activated sludge in membrane bioreactors. A rather young application of ultrafiltration is the recovery of nutrients from anaerobic digestates, e.g., from agricultural biogas plants. A process chain of solid/liquid separation, ultrafiltration, and reverse osmoses separates the digestate into different products: an organic N-P-fertilizer (solid digestate), a recirculate (UF retentate), a liquid N-K-fertilizer (RO retentate) and water. Despite the preceding particle removal, high crossflow velocities are required in the ultrafiltration step to overcome fouling. This leads to high operation costs of the ultrafiltration step and often limits the economical application of the complete process chain. In this study, under-stoichiometric ozone treatment of the ultrafiltration feed stream is investigated. Ozone treatment reduced the biopolymer concentration and apparent viscosity of different digestate centrates. Permeabilities of centrate treated with ozone were higher than without ozone treatment. In a laboratory test rig and in a pilot plant operated at the site of two full scale biogas plants, ultrafiltration flux could be improved by 50–80% by ozonation. Nutrient concentrations in the fertilizer products were not affected by ozone treatment.

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Section: Influence Of Ozone On Fluid Propertiessupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Influence of Ozone Treatment on Ultrafiltration Performance and Nutrient Flow in a Membrane Based Nutrient Recovery Process from Anaerobic Digestate

Gienau¹,

Ehrmanntraut

Kraume

et al. 2020

Membranes

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“…The common event of the seasonal algae blooms in the surface drinking water sources like lakes and reservoirs due to the changes in nutrient loads and water temperature incur a severe challenge to conventional processes of drinking water treatment 42,43 . Undesirable cyanobacteria bloom not only interferes with the treatment processes but also discharges large amounts of intracellular pollutant and odor compounds that intensively affect the quality of water supply 44–47 . The presence of cyanobacteria blooms in water treatment plants based filtration leading to several major challenges such as increased coagulant request, short filter runs, and extreme head loss development 44 .…”

Section: Resultsmentioning

confidence: 99%

Influence of diazonium‐induced surface grafting on PES NF membrane fouling reduction in algal‐rich water treatment

Oulad

Zinadini

Zinatizadeh

et al. 2021

Polymers for Advanced Techs

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The algae bloom phenomenon incurs a major challenge to conventional drinking water treatment processes due to the discharges of a large amount of intracellular pollutant and odor compounds in the water sources. Membrane processes have been considered as promising technologies to treatment of algal‐rich water due to complete algal cell rejection however, its application has been limited by membrane fouling. In this work, the high‐performance loose antifouling PES NF membranes were fabricated using diazonium‐induced grafting and applied for treating real algal effluent. The modified membranes exhibited complete algal dye removal and turbidity removal throughout the long‐term filtration. Also, the coupling and radically modified membranes can be able to removed COD by up to 90% and 88%, respectively, while a removal efficiency of 24% was observed for bare membrane. It is worth noting that, a relative smooth behavior in permeate flux by loose modified membranes during prolonged algal dye filtration, demonstrating exceptional anti‐fouling property of membranes. In addition, the fouled modified membranes were effectively recovered by water flushing. Both loose modified membranes exhibited excellent resistance in the strongly acidic environment. These high performance antifouling NF membranes affords an innovative methodology toward the treatment of algal‐rich water.

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“…R irrf can be calculated applying Equation (4) to the recovered water flux ( J r ), whereas R revf is calculated according to Equation (5):

J_{r} = Δ P / μ false(R_{m} + R_{i r r f} false)

J_{f} = Δ P / μ R_{t} = Δ P / μ false(R_{m} + R_{f} false) = Δ P / μ (R_{m} + R_{r e v f} + R_{i r r f})

where R t is the total resistance (m −1 ). R revf is due to concentration polarization and the formation of a cake layer on the membrane surface, removable by physical cleaning; R irrf is due to pore blocking, and adsorption and can only be suppressed by chemical cleaning [37], which however was not investigated in this study.…”

Section: Methodsmentioning

confidence: 99%

Preparation and Characterization of Hydrophilically Modified PVDF Membranes by a Novel Nonsolvent Thermally Induced Phase Separation Method

Xiao

Cai

et al. 2016

Membranes

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In this study, a nonsolvent thermally-induced phase separation (NTIPS) method was first proposed to fabricate hydrophilically-modified poly(vinylidene fluoride) (PVDF) membranes to overcome the drawbacks of conventional thermally-induced phase separation (TIPS) and nonsolvent-induced phase separation (NIPS) methods. Hydrophilically-modified PVDF membranes were successfully prepared by blending in hydrophilic polymer polyvinyl alcohol (PVA) at 140 °C. A series of PVDF/PVA blend membranes was prepared at different total polymer concentrations and blend ratios. The morphological analysis via SEM indicated that the formation mechanism of these hydrophilically-modified membranes was a combined NIPS and TIPS process. As the total polymer concentration increased, the tensile strength of the membranes increased; meanwhile, the membrane pore size, porosity and water flux decreased. With the PVDF/PVA blend ratio increased from 10:0 to 8:2, the membrane pore size and water flux increased. The dynamic water contact angle of these membranes showed that the hydrophilic properties of PVDF/PVA blend membranes were prominently improved. The higher hydrophilicity of the membranes resulted in reduced membrane resistance and, hence, higher permeability. The total resistance Rt of the modified PVDF membranes decreased significantly as the hydrophilicity increased. The irreversible fouling related to pore blocking and adsorption fouling onto the membrane surface was minimal, indicating good antifouling properties.

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Effect of pre-ozonation on mitigation of ceramic UF membrane fouling caused by algal extracellular organic matters

Cited by 119 publications

References 30 publications

Influence of Ozone Treatment on Ultrafiltration Performance and Nutrient Flow in a Membrane Based Nutrient Recovery Process from Anaerobic Digestate

Influence of Ozone Treatment on Ultrafiltration Performance and Nutrient Flow in a Membrane Based Nutrient Recovery Process from Anaerobic Digestate

Influence of diazonium‐induced surface grafting on PES NF membrane fouling reduction in algal‐rich water treatment

Preparation and Characterization of Hydrophilically Modified PVDF Membranes by a Novel Nonsolvent Thermally Induced Phase Separation Method

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