Integration of ferrate (VI) pretreatment and ceramic membrane reactor for membrane fouling mitigation in reclaimed water treatment

Liu, Jing; Zhang, Zhenghua; Liu, Zhenyang; Zhang, Xihui

doi:10.1016/j.memsci.2018.02.031

Cited by 42 publications

(5 citation statements)

References 45 publications

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“…As for the selected “middle‐standard clogging model,” the contribution of both intermediate clogging and standard clogging can be obtained by comparing the ratio of the fitting parameter Ki/Ks (Bolton et al, 2006). The fitting parameter Ki/Ks of the three filtration modes indicated that the intermediate pollution was the main form of membrane fouling when the shale gas wastewater was directly filtered by ceramic membrane, which was similar to the previous study (Liu et al, 2018). The results indicated that the main form of membrane fouling was due to the wide distribution of the particulates in wastewater.…”

Section: Resultssupporting

confidence: 88%

Integration of coagulation and ozonation with flat‐sheet ceramic membrane filtration for shale gas hydraulic fracturing wastewater treatment: A laboratory study

Song

Liu³

et al. 2021

Water Environment Research

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The performance of the integrated process of coagulation and ozonation with ceramic membrane filtration was evaluated for the treatment of shale gas hydraulic fracturing flowback wastewater (HFFW). The removal efficiencies of carbon oxygen demand (CODCr), dissolved organic carbon (DOC), petroleum oils, and turbidity in effluent by the combined process were 87.1%, 72.2%, 94.3%, and 99.6%, respectively. Compared with sole membrane filtration, the transmembrane pressure (TMP) of ceramic membrane filtration was reduced by >99% with the integrated process. The coagulation and ozonation can effectively remove the organics with high molecular weights in the cake layer of ceramic membrane. To the best of our knowledge, this work proposed the combined process of coagulation, ozonation, and flat‐sheet ceramic membrane filtration for the treatment of HFFW for the first time. The water quality of the effluent met the discharge standard (Comprehensive Wastewater Discharge Standard GB8978‐1996). The findings can provide an important technical foundation for the innovation of integrated equipment for HFFW treatment. Practitioner points An integrated process combining coagulation and ozonation with flat‐sheet ceramic membrane ultrafiltration for the treatment of shale gas wastewater. The water quality of this integrated process met the discharge standard. Coagulation and ozonation effectively alleviated the membrane fouling related to organics with high molecular weights. A new avenue for on‐site treatment of shale gas wastewater and an alternative of the current centralized wastewater management.

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Section: Resultssupporting

confidence: 88%

Integration of coagulation and ozonation with flat‐sheet ceramic membrane filtration for shale gas hydraulic fracturing wastewater treatment: A laboratory study

Song

Liu³

et al. 2021

Water Environment Research

Self Cite

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“…48 Ferrate is an intense oxidant and would preferentially attack electron-rich moieties. 48,49 After the reaction with ferrate, the removal ratio of DOC increased to 41% while the elimination ratio of UV 254 increased to 64%. This indicates that ferrate preferentially reacted with unsaturated bonds and led to the decrease of UV 254 in the reaction with DOC.…”

Section: Resultsmentioning

confidence: 99%

“…Theoretically, UV 254 reflects the content of dissolved organics containing unsaturated bonds (such as the benzene ring, CC bond, and CO bond in humus-like macromolecular organics and aromatic compounds) . Ferrate is an intense oxidant and would preferentially attack electron-rich moieties. , After the reaction with ferrate, the removal ratio of DOC increased to 41% while the elimination ratio of UV 254 increased to 64%. This indicates that ferrate preferentially reacted with unsaturated bonds and led to the decrease of UV 254 in the reaction with DOC.…”

Section: Results and Discussionmentioning

confidence: 99%

Ferrate Preoxidation Alleviating Membrane Fouling through the Formation of a Hydrophilic Prefiltration Layer

Qiu

Liu

et al. 2021

ACS EST Eng.

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Membrane fouling is one of the main obstacles impacting ultrafiltration (UF) membranes for water purification. Herein, it was found that a hydrophilic layer that is composed of a ferric floc formed in the reduction of ferrate coated on the membrane during the ultrafiltration of river water, and this layer is effective for attenuating membrane fouling. The newly formed ferric (hydro)oxide particles aggregated with natural organic matter (NOM) of the source water and then deposited on the membrane surface forming a negatively charged, porous, and hydrophilic prefiltration layer. This layer was beneficial for rejecting transphilic dissolved organic carbon (DOC), resulted in the accumulation of external membrane foulants, and alleviated internal membrane fouling. The membrane flux improved by 2.8 times, and the membrane fouling resistance decreased by 0.36 times after preoxidation with 1.5 mg/L of ferrate. Meanwhile, the performance of the membrane rejection was enhanced by this layer as well. DOC and UV 254 were eliminated by 41% and 67% at the condition of 2.0 mg/L ferrate preoxidation coupled with UF. A model analysis suggested that intermediate and standard pore blocking were enhanced after ferrate preoxidation, while cake layer fouling was substantially attenuated. The ferric prefiltration layer can be back-washed for the recovery of membrane flux and be repeatedly generated through ferrate preoxidation. The combination of ferrate preoxidation with UF takes full advantage of the oxidizability of ferrate and the aggregation/adsorption potential of ferric (hydro)oxides by the reduction of ferrate.

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“…The increased concentration of SS and the effective decrease of high MW organics after in-line coagulation/flocculation have been reported to facilitate the formation of a more porous cake layer which presented less fouling propensity. 34 Based on these results, it could be concluded that there is an alum dosage (0.5 mM) above which there is no further improvement in K c values irrespective of temperature of SBR effluent. For the conditions investigated, the dosage of 0.5 mM was also found to meet common requirements for TP control which was previously discussed in section 3.1.…”

Section: Fouling Mitigation Mechanisms By In-line Coagulation/floccul...mentioning

confidence: 86%

The impact of secondary operating temperature on in-line coagulation/flocculation and fouling of membranes used in tertiary treatment

Tao,

Parker,

Bérubé

2024

Environ. Sci.: Water Res. Technol.

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Integration of ferrate (VI) pretreatment and ceramic membrane reactor for membrane fouling mitigation in reclaimed water treatment

Cited by 42 publications

References 45 publications

Integration of coagulation and ozonation with flat‐sheet ceramic membrane filtration for shale gas hydraulic fracturing wastewater treatment: A laboratory study

Integration of coagulation and ozonation with flat‐sheet ceramic membrane filtration for shale gas hydraulic fracturing wastewater treatment: A laboratory study

Ferrate Preoxidation Alleviating Membrane Fouling through the Formation of a Hydrophilic Prefiltration Layer

The impact of secondary operating temperature on in-line coagulation/flocculation and fouling of membranes used in tertiary treatment

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