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Membrane Fouling Alleviation by Chemically Enhanced Backwashing in Treating Algae-Containing Surface Article

Xiaobin Tang, Tiecheng Guo, Haiqing Chang, Xiao Yue, Jinlong Wang, Haikuan Yu, Binghan Xie, Xuewu Zhu, Guibai Li, Heng Liang

Engineering 2022, Volume 19, Issue 12,   Pages 40-49 doi: 10.1016/j.eng.2021.01.013

Abstract: In this study, a simple and practical chemically enhanced backwashing (CEB) process was developed toCompared with the conventional hydraulic backwashing without chemical involvement, the CEB process can

Keywords： Ultrafiltration     Membrane fouling     Hydraulically irreversible membrane fouling     Chemically enhanced backwashing    

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Impacts of backwashing on micropollutant removal and associated microbial assembly processes in sand

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 3, doi: 10.1007/s11783-023-1634-z

Abstract:

● Backwashing in sand filters with 2-h and 4-h EBCTs was simulated

Keywords： Sand filter     Backwashing     Recovery     Micropollutants     Community composition    

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Occurrence and removal of

Lin WANG,Yongmei LI,Xiaoling SHANG,Jing SHEN

Frontiers of Environmental Science & Engineering 2014, Volume 8, Issue 4,   Pages 519-530 doi: 10.1007/s11783-013-0610-4

Abstract: Chemically enhanced primary process (CEPP) had no effect on removal of either NDMA or NDMA FP.

Keywords： N-nitrosodimethylamine     NDMA precursors     NDMA formation potential     biological treatment process     chemicallyenhanced primary process    

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Acidogenic sludge fermentation to recover soluble organics as the carbon source for denitrification in wastewater treatment: Comparison of sludge types

Lin Lin, Ying-yu Li, Xiao-yan Li

Frontiers of Environmental Science & Engineering 2018, Volume 12, Issue 4, doi: 10.1007/s11783-018-1043-x

Abstract:

CEPS sludge was compared with conventional primary and secondary sludge for the VFAs yield.

Fe-based CEPS sludge exhibited the highest efficiency of organic recovery.

Fermented CEPS sludge liquor provided a sufficient carbon source for denitrification.

99% of nitrate removal was achieved based on the Fe-CEPS and sludge fermentation.

Keywords： Sewage sludge     Chemically enhanced primary sedimentation (CEPS)     Acidogenic fermentation     Organic carbon    

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Effect of biological activated carbon filter depth and backwashing process on transformation of biofilm

Wanqi Qi, Weiying Li, Junpeng Zhang, Xuan Wu, Jie Zhang, Wei Zhang

Frontiers of Environmental Science & Engineering 2019, Volume 13, Issue 1, doi: 10.1007/s11783-019-1100-0

Abstract:

We studied BAC biofilm during the process of initial operation and backwash.

Microbial diversity decreased gradually with the increase of BAC filter depth.

Proteobacteria dominated at the phylum level among the BAC biofilm samples.

α-proteobacteria increased about 10% in all carbon filter depth after backwash.

Keywords： Biological activated carbon     Biofilm     Community structure     Carbon filter depth     High-throughput sequencing    

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A comparative study of the mechanical properties, fracture behavior, creep, and shrinkage of chemically

Mahdi AREZOUMANDI, Mark EZZELL, Jeffery S VOLZ

Frontiers of Structural and Civil Engineering 2014, Volume 8, Issue 1,   Pages 36-45 doi: 10.1007/s11709-014-0243-0

Abstract: investigation that compares the mechanical properties, fracture behavior, creep, and shrinkage of a chemically-basedhigh fluidity was achieved with a polycarboxylate-based high-range water-reducing admixture, while the enhanced

Keywords： admixture     conventional concrete (CC)     creep     fracture mechanic     mechanical Properties     self-consolidating concrete (SCC)     shrinkage    

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Chemically triggered life control of “smart” hydrogels through click and declick reactions

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 9,   Pages 1399-1406 doi: 10.1007/s11705-022-2149-z

Abstract: The degradation of polymeric materials is recognized as one of the goals to be fulfilled for the sustainable economy. In this study, a novel methodology was presented to synthesize multiple highly cross-linked polymers (i.e., hydrogels) through amine–thiol scrambling under mild conditions. Amine-terminated poly(ethylene glycol) (PEG-NH2) was reacted with the representative conjugate acceptors to synthesize hydrogels in organic and aqueous solutions, respectively. The materials above exhibited high water-swelling properties, distributed porous structures, as well as prominent mechanical strengths. It is noteworthy that the mentioned hydrogels could be degraded efficiently in hours to release the original coupling partner, which were induced by ethylene diamine at ambient temperature through amine-amine metathesis. The recovered PEG-NH2 reagent could be employed again to regenerate hydrogels. Due to the multiple architectures and functions in polymeric synthesis, degradation and regeneration, a new generation of “smart” materials is revealed.

Keywords： hydrogels     degradation     synthesis     regeneration    

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Chemically reactive solute transfer in a boundary layer slip flow along a stretching cylinder

Swati Mukhopadhyay

Frontiers of Chemical Science and Engineering 2011, Volume 5, Issue 3,   Pages 385-391 doi: 10.1007/s11705-011-1101-4

Abstract: This paper presents the distribution of a solute undergoing a first order chemical reaction in an axisymmetric laminar boundary layer flow along a stretching cylinder. Velocity slip condition at the boundary is used instead of no-slip condition. Similarity transformations are used to convert the partial differential equations corresponding to momentum and concentration into highly nonlinear ordinary differential equations. Numerical solutions of these equations are obtained by the shooting method. The velocity decreases with increasing slip parameter. The skin friction as well as the mass transfer rate at the surface is larger for a cylinder than for a flat plate.

Keywords： boundary layer     stretching cylinder     partial slip     mass transfer     similarity solution    

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Nanoparticle-enhanced coolants in machining: mechanism, application, and prospects

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 4, doi: 10.1007/s11465-023-0769-8

Abstract: Nanoparticle-enhanced coolants (NPECs) are increasingly used in minimum quantity lubrication (MQL) machiningFirst, the laws of influence of nano-enhanced phases and base fluids on the processing performance are

Keywords： nanoparticle-enhanced coolant     minimum quantity lubrication     biolubricant     thermophysical properties    

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A review on the application of nanofluids in enhanced oil recovery

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 8,   Pages 1165-1197 doi: 10.1007/s11705-021-2120-4

Abstract: Enhanced oil recovery (EOR) has been widely used to recover residual oil after the primary or secondary

Keywords： nanofluid     EOR mechanism     nanoparticle adsorption     interface property     internal property    

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Generation of enhanced stability of SnO/In(OH)/InP for photocatalytic water splitting by SnO protection

Frontiers in Energy 2021, Volume 15, Issue 3,   Pages 710-720 doi: 10.1007/s11708-021-0764-x

Abstract: paper, it is demonstrated that the stability and activity of the InP-based catalyst are effectively enhanced

Keywords： SnO/In(OH)3/InP photocatalyst     enhanced activity and stability for water splitting     corrosion    

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CO, N, and CO/N mixed gas injection for enhanced shale gas recovery and CO geological storage

Frontiers in Energy 2023, Volume 17, Issue 3,   Pages 428-445 doi: 10.1007/s11708-023-0865-9

Abstract: In this work, using fractured shale cores, isothermal adsorption experiments and core flooding tests were conducted to investigate the performance of injecting different gases to enhance shale gas recovery and CO2 geological storage efficiency under real reservoir conditions. The adsorption process of shale to different gases was in agreement with the extended-Langmuir model, and the adsorption capacity of CO2 was the largest, followed by CH4, and that of N2 was the smallest of the three pure gases. In addition, when the CO2 concentration in the mixed gas exceeded 50%, the adsorption capacity of the mixed gas was greater than that of CH4, and had a strong competitive adsorption effect. For the core flooding tests, pure gas injection showed that the breakthrough time of CO2 was longer than that of N2, and the CH4 recovery factor at the breakthrough time (RCH4) was also higher than that of N2. The RCH4 of CO2 gas injection was approximately 44.09%, while the RCH4 of N2 was only 31.63%. For CO2/N2 mixed gas injection, with the increase of CO2 concentration, the RCH4 increased, and the RCH4 for mixed gas CO2/N2 = 8:2 was close to that of pure CO2, about 40.24%. Moreover, the breakthrough time of N2 in mixed gas was not much different from that when pure N2 was injected, while the breakthrough time of CO2 was prolonged, which indicated that with the increase of N2 concentration in the mixed gas, the breakthrough time of CO2 could be extended. Furthermore, an abnormal surge of N2 concentration in the produced gas was observed after N2 breakthrough. In regards to CO2 storage efficiency (Sstorage-CO2), as the CO2 concentration increased, Sstorage-CO2 also increased. The Sstorage-CO2 of the pure CO2 gas injection was about 35.96%, while for mixed gas CO2/N2 = 8:2, Sstorage-CO2 was about 32.28%.

Keywords： shale gas     gas injection     competitive adsorption     enhanced shale gas recovery     CO2 geological    

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Understanding the behavior of recycled aggregate concrete by using thermogravimetric analysis

Subhasis PRADHAN, Shailendra KUMAR, Sudhirkumar V. BARAI

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 6,   Pages 1561-1572 doi: 10.1007/s11709-020-0640-5

Abstract: A method is proposed to estimate the degree of hydration ( ) from chemically bound water ( ).The chemically bound water at infinite time ( ) of RAC mixes are lower than the respective conventional

Keywords： recycled aggregate concrete     Particle Packing Method     thermogravimetric analysis     chemically bound water    

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A MYB-INDUCED MECHANISM FOR ENHANCED ASCORBATE IN RED-FLESHED APPLES

Richard V. ESPLEY, Kuilin WANG

Frontiers of Agricultural Science and Engineering   Pages 356-357 doi: 10.15302/J-FASE-2021381

Abstract: These red-fleshed apples have enhanced concentrations of both anthocyanins and ascorbate, both of which
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Gain-enhanced reconfigurable radiation array with mechanically driven system and directive elements

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 4, doi: 10.1007/s11465-022-0716-0

Abstract: However, conventional antennas with constant phase distributions cannot achieve enhanced gains in differentarray (RRA) based on miniaturized elements and a mechanically reconfigurable system to obtain gain-enhancedof freedom to realize the size and phase distribution reconfiguration simultaneously to validate the enhanced

Keywords： mechanism     reconfigurable radiation array (RRA)     compact state     deployed state     enhanced gain    

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Title Author Date Type Operation

Membrane Fouling Alleviation by Chemically Enhanced Backwashing in Treating Algae-Containing Surface

Xiaobin Tang, Tiecheng Guo, Haiqing Chang, Xiao Yue, Jinlong Wang, Haikuan Yu, Binghan Xie, Xuewu Zhu, Guibai Li, Heng Liang

Journal Article

Impacts of backwashing on micropollutant removal and associated microbial assembly processes in sand

Journal Article

Occurrence and removal of

Lin WANG,Yongmei LI,Xiaoling SHANG,Jing SHEN

Journal Article

Acidogenic sludge fermentation to recover soluble organics as the carbon source for denitrification in wastewater treatment: Comparison of sludge types

Lin Lin, Ying-yu Li, Xiao-yan Li

Journal Article

Effect of biological activated carbon filter depth and backwashing process on transformation of biofilm

Wanqi Qi, Weiying Li, Junpeng Zhang, Xuan Wu, Jie Zhang, Wei Zhang

Journal Article

A comparative study of the mechanical properties, fracture behavior, creep, and shrinkage of chemically

Mahdi AREZOUMANDI, Mark EZZELL, Jeffery S VOLZ

Journal Article

Chemically triggered life control of “smart” hydrogels through click and declick reactions

Journal Article

Chemically reactive solute transfer in a boundary layer slip flow along a stretching cylinder

Swati Mukhopadhyay

Journal Article

Nanoparticle-enhanced coolants in machining: mechanism, application, and prospects

Journal Article

A review on the application of nanofluids in enhanced oil recovery

Journal Article

Generation of enhanced stability of SnO/In(OH)/InP for photocatalytic water splitting by SnO protection

Journal Article

CO, N, and CO/N mixed gas injection for enhanced shale gas recovery and CO geological storage

Journal Article

Understanding the behavior of recycled aggregate concrete by using thermogravimetric analysis

Subhasis PRADHAN, Shailendra KUMAR, Sudhirkumar V. BARAI

Journal Article

A MYB-INDUCED MECHANISM FOR ENHANCED ASCORBATE IN RED-FLESHED APPLES

Richard V. ESPLEY, Kuilin WANG

Journal Article

Gain-enhanced reconfigurable radiation array with mechanically driven system and directive elements

Journal Article