Mechanism of humic acid fouling in a photocatalytic membrane system

Zhu, Ruochen; Diaz, Alfredo J.; Shen, Yun; Qi, Fei; Chang, Xueming; Durkin, David P.; Sun, Yingxue; Solares, Santiago D.; Shuai, Danmeng

doi:10.1016/j.memsci.2018.06.017

Cited by 52 publications

(16 citation statements)

References 60 publications

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“…Nevertheless, membrane filtration is always hindered by the phenomenon of membrane fouling caused by the deposition of contaminants, resulting in pore blockage and cake layer formation on the membrane. Membrane fouling lowers membrane permeability, thus necessitating chemical cleaning and shortens the membrane's lifetime [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Diethylene Glycol-Assisted Organized TiO2 Nanostructures for Photocatalytic Wastewater Treatment Ceramic Membranes

Ahmad

Kim

et al. 2019

Water

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A high-performance photocatalytic ceramic membrane was developed by direct growth of a TiO2 structure on a macroporous alumina support using a hydrothermal method. The morphological nanostructure of TiO2 on the support was successfully controlled via the interaction between the TiO2 precursor and a capping agent, diethylene glycol (DEG). The growth of anatase TiO2 nanorods was observed both on the membrane surface and pore walls. The well-organized nanorods TiO2 reduced the perturbation of the alumina support, thus controlling the hydrolysis rate of the TiO2 precursor and reducing membrane fouling. However, a decrease in the amount of the DEG capping agent significantly reduced membrane permeability, owing to the formation of nonporous clusters of TiO2 on the support. Distribution of the organized TiO2 nanorods on the support was very effective for the improvement of the organic removal efficiency and antifouling under ultraviolet illumination. The TiO2 nanostructure associated with the reactive crystalline phase, rather than the amount of layered TiO2 formed on the support, which was found to be the key to controlling photocatalytic membrane reactivity. These experimental findings would provide a new approach for the development of efficacious photocatalytic membranes with improved performance for wastewater treatment.

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Section: Introductionmentioning

confidence: 99%

Diethylene Glycol-Assisted Organized TiO2 Nanostructures for Photocatalytic Wastewater Treatment Ceramic Membranes

Ahmad

Kim

et al. 2019

Water

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“…However, the pressure can occasionally be too high for smaller flocculation particles, and this is difficult to regulate and sample them accurately since flocs come in a variety of different sizes. In general, MF and UF are used to remove particles, turbidity, microorganisms and natural organic matter [58,59]. Prisciandaro et al [54] suggested that the UF process should be more efficient than the MF processes, because MF membranes are only effective when the process is conducted in a tubular configuration.…”

Section: Membrane Filtrationmentioning

confidence: 99%

“…These processes are mostly served as a pretreatment before membrane filtration to prevent the accumulation of substances on the pores of membranes [71]. Zhu et al [58] investigated the effect of humic acid on membrane fouling and found that, other than the molecular weight loss and mineralization of the structure of humic acid, the other changes that occur in its structure after photocatalytic oxidation play a vital role in preventing membrane fouling. Photocatalytic oxidation works well for mitigating membrane fouling because it introduces oxygen-containing functional groups into the structure of humic acid.…”

Section: Membrane Filtrationmentioning

confidence: 99%

Advances in Circular Bioeconomy Technologies: From Agricultural Wastewater to Value-Added Resources

et al. 2021

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This review systematically outlines the recent advances in the application of circular bioeconomy technologies for converting agricultural wastewater to value-added resources. The properties and applications of the value-added products from agricultural wastewater are first summarized. Various types of agricultural wastewater, such as piggery wastewater and digestate from anaerobic digestion, are focused on. Next, different types of circular technologies for recovery of humic substances (e.g., humin, humic acids and fulvic acids) and nutrients (e.g., nitrogen and phosphorus) from agricultural wastewater are reviewed and discussed. Advanced technologies, such as chemical precipitation, membrane separation and electrokinetic separation, are evaluated. The environmental benefits of the circular technologies compared to conventional wastewater treatment processes are also addressed. Lastly, the perspectives and prospects of the circular technologies for agricultural wastewater are provided.

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“…Seawater RO membranes are prone to fouling by natural organic matter (NOM), such as humic acid (HA) [21]. To verify the effectiveness of conductive PVA-NC-CNS membranes for foulant removal via electrolysis, the membranes were first fouled by HA.…”

Section: Electrolysismentioning

confidence: 99%

Fouling control in reverse osmosis membranes through modification with conductive carbon nanostructures

2019

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A conductive form of networked cellulose, prepared by incorporating carbon nanotubes, has been used in polyvinyl alcohol (PVA) membranes for reverse osmosis. The use of networked cellulose and carbon nanostructures (CNS) not only helps control the thermal, mechanical and electrical properties of the membrane, but also enhances RO performance and allows the membrane surface to be cleaned electrolytically. High surface area multiwalled CNTs become trapped in the structure of networked cellulose. The modified material has greater tensile strength and elastic modulus, indicating an improvement in the mechanical properties of the membrane. Membranes with CNS demonstrate enhanced electrocatalytic activity when tested for hydrogen evolution in an acidic medium. The membranes are successfully applied to reverse osmosis using a feed of 25000 ppm NaCl, where the membranes with 7 wt. % CNS exhibited a 93% increase in flux compared to PVA-NC with no CNS, due to the nanotubes disrupting the compression of polymer chains under pressure. The membrane surface was recovered after fouling via electrolytic cleaning where the membrane was used as the cathode and a potential of-5V was applied for 20 minutes. All membranes retained a high salt rejection above 99.8%.

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Mechanism of humic acid fouling in a photocatalytic membrane system

Cited by 52 publications

References 60 publications

Diethylene Glycol-Assisted Organized TiO2 Nanostructures for Photocatalytic Wastewater Treatment Ceramic Membranes

Diethylene Glycol-Assisted Organized TiO2 Nanostructures for Photocatalytic Wastewater Treatment Ceramic Membranes

Advances in Circular Bioeconomy Technologies: From Agricultural Wastewater to Value-Added Resources

Fouling control in reverse osmosis membranes through modification with conductive carbon nanostructures

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