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Degradation of refractory organics in concentrated leachate by the Fenton process: Central compositedesign for process optimization

Senem Yazici Guvenc, Gamze Varank

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 1, doi: 10.1007/s11783-020-1294-1

Abstract: Abstract • 90% total COD, 95.3% inert COD and 97.2% UV254 were removed. • High R2 values (over 95%) for all responses were obtained with CCD. • Operational cost was calculated to be 0.238 €/g CODremoved for total COD removal. • Fenton oxidation was highly-efficient method for inert COD removal. • BOD5/COD ratio of leachate concentrate raised from 0.04 to 0.4. The primary aim of this study is inert COD removal from leachate nanofiltration concentrate because of its high concentration of resistant organic pollutants. Within this framework, this study focuses on the treatability of leachate nanofiltration concentrate through Fenton oxidation and optimization of process parameters to reach the maximum pollutant removal by using response surface methodology (RSM). Initial pH, Fe2+ concentration, H2O2/Fe2+ molar ratio and oxidation time are selected as the independent variables, whereas total COD, color, inert COD and UV254 removal are selected as the responses. According to the ANOVA results, the R2 values of all responses are found to be over 95%. Under the optimum conditions determined by the model (pH: 3.99, Fe2+: 150 mmol/L, H2O2/Fe2+: 3.27 and oxidation time: 84.8 min), the maximum COD removal efficiency is determined as 91.4% by the model. The color, inert COD and UV254 removal efficiencies are determined to be 99.9%, 97.2% and 99.5%, respectively, by the model, whereas the total COD, color, inert COD and UV254 removal efficiencies are found respectively to be 90%, 96.5%, 95.3% and 97.2%, experimentally under the optimum operating conditions. The Fenton process improves the biodegradability of the leachate NF concentrate, increasing the BOD5/COD ratio from the value of 0.04 to the value of 0.4. The operational cost of the process is calculated to be 0.238 €/g CODremoved. The results indicate that the Fenton oxidation process is an efficient and economical technology in improvement of the biological degradability of leachate nanofiltration concentrate and in removal of resistant organic pollutants.

Keywords： Concentrated leachate     Fenton oxidation     Central composite design     Biodegradability     Inert COD    

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Development of a multi-component drug from turmeric using central composite design

Xiaohang ZHANG,Shengnan HAN,Yan LI,Jianlan JIANG

Frontiers of Chemical Science and Engineering 2014, Volume 8, Issue 3,   Pages 362-368 doi: 10.1007/s11705-014-1439-5

Abstract: methodology to develop multi-component drugs based on traditional Chinese medicines has been developed using centralcomposite design.Response surface methodology based on a central composite design was applied to determine the quantitativeThese results demonstrate that response surface methodology based on a central composite design is suitablefor the design of multi-component drugs.

Keywords： multi-component drug development     central composite design     turmeric     curcuminoids    

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Statistical modeling of radiolytic (

G. S. Muthu Iswarya, B. Nirkayani, A. Kavithakani, V. C. Padmanaban

Frontiers of Environmental Science & Engineering 2019, Volume 13, Issue 3, doi: 10.1007/s11783-019-1126-3

Abstract:

Linear, interactive and quadratic effects of process parameters were studied.

Degradation of Ofloxacin (Ofx) was related with G value of irradiation process.

The synergistic effect of H2O2 on lower dose of g-irradiation was established.

The process follows pseudo first order with dose constant (d = 0.232 kGy–1).

Keywords： Ofloxacin     Gamma irradiation     Face centered central composite design     Reaction kinetics     Gas Chromatography-Mass    

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Removal of malachite green from aqueous solution by sorption on hydrilla verticillata biomass using response surface methodology

R. RAJESHKANNAN, N. RAJAMOHAN, M. RAJASIMMAN

Frontiers of Chemical Science and Engineering 2009, Volume 3, Issue 2,   Pages 146-154 doi: 10.1007/s11705-009-0007-x

Abstract: The central composite face-centered experimental design (CFCD) in response surface methodology (RSM)

Keywords： response surface methodology     hydrilla verticillata     malachite green     adsorption     central composite design    

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Trial design of arch bridge of composite box section with steel web-concrete flange

Jiangang WEI, Qingwei HUANG, Baochun CHEN,

Frontiers of Structural and Civil Engineering 2010, Volume 4, Issue 3,   Pages 370-375 doi: 10.1007/s11709-010-0073-7

Abstract: A potential solution is to use a composite box arch ring with steel web-concrete flange.concrete arch bridge in the world with a main span of 420 m) as a prototype, trial designs of a compositeComparison of quantities and structural behaviors of the prototype concrete arch with the two trial designed compositeIt is shown that the self-weight of the composite arch can reduce about 28% and the structures can meetthe design requirements, therefore it is possible to use the two composite arches in long span arch

Keywords： steel webs     concrete     box arch     trial design     structural behaviors     finite element method    

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Design of composite flywheel rotor

BAI Yue, GAO Qingjia, LI Haiwen, WU Yihui, XUAN Ming

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 3,   Pages 288-292 doi: 10.1007/s11465-008-0045-y

Abstract: A design method for a flywheel rotor composed of a composite rim and a metal hub is proposed by studyingThe composite flywheel rotor is produced and its rotation stress has been tested at the speed of 20 krpmThe emulation results are consistent with testing results, which proves that the introduced design method

Keywords： introduced     useful     density     composite     driving machine    

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Analysis and design of steel-concrete composite sandwich systems subjected to extreme loads

Kazi Md Abu SOHEL, Jat Yuen Richard LIEW, Min Hong ZHANG

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 3,   Pages 278-293 doi: 10.1007/s11709-011-0120-z

Abstract: This paper presents the design guide based on analytical, numerical and experimental investigation of

Keywords： blast load     composite structure     impact load     lightweight concrete     sandwich plate     J-hook connector    

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Design concepts of an aircraft wing: composite and morphing airfoil with auxetic structures

P R BUDARAPU,Sudhir Sastry Y B,R NATARAJAN

Frontiers of Structural and Civil Engineering 2016, Volume 10, Issue 4,   Pages 394-408 doi: 10.1007/s11709-016-0352-z

Abstract: This paper is categorized into two parts. (1) A frame work to design the aircraft wing structure andThe strength based design is adopted, where the design loads are extracted from the aerodynamic loadsto estimate the sizes of various sections of a composite wing structure.A three dimensional numerical model of the composite wing structure has been developed and analyzed forFurthermore, the discussed design principles in the first part are extended to the design of a morphing

Keywords： wing design     aerodynamic loads     morphing airfoil     auxetic structures     negative Poisson’s ratio    

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Seismic performance of fabricated continuous girder bridge with grouting sleeve-prestressed tendon composite

Frontiers of Structural and Civil Engineering   Pages 827-854 doi: 10.1007/s11709-023-0954-1

Abstract: study, a fiber element model of a fabricated concrete pier with grouting sleeve-prestressed tendon compositeFurthermore, the seismic performance of the composite fabricated pier was investigated.The composite fabricated pier had a good self-centering capability.In addition, the plastic hinge zones of the grouting sleeve-fabricated pier and the composite fabricatedThe composite fabricated pier with optimal design parameters has good seismic performance and can be

Keywords： seismic performance     continuous girder bridge     grouting sleeve-prestressed tendon composite connections     grouted sleeve connection     design parameters    

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Design and Fabrication of Multiphase Composite Ceramic Tool Materials

Xu Chonghai,Ai Xing

Strategic Study of CAE 2001, Volume 3, Issue 3,   Pages 71-74

Abstract:

The multiphase composite and the computer aided design of the ceramics are two significant trendsthe relationships between the mechanical properties and the material compositions of the multiphase compositeThen, an advanced Al2〇3—SiC-(W,Ti)C multiphase composite ceramic cuttingproperties, which proves that the method proposed in the present study is reasonable and feasible for the designof multiphase composite ceramic tool materials.

Keywords： ceramic tool material     multiphase composite     material design     model     mechanical property    

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Design of nanofibre interlayer supported forward osmosis composite membranes and its evaluation in fouling

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 9, doi: 10.1007/s11783-022-1550-7

Abstract:

• A fine fibre (40–60 nm diameter) interlayer (~1 µm thickness) was electrospun.

Keywords： Forward osmosis     Electro-spinning     Interfacial polymerisation     Fouling     Polyvinylidene fluoride    

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Multiscale RBF-based central high resolution schemes for simulation of generalized thermoelasticity problems

Hassan YOUSEFI, Alireza TAGHAVI KANI, Iradj MAHMOUDZADEH KANI

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 2,   Pages 429-455 doi: 10.1007/s11709-018-0483-5

Abstract: In this study, average-interpolating radial basis functions (RBFs) are successfully integrated with centralhigh-resolution schemes to achieve a higher-order central method.In the central high resolution formulation, RBFs lead to a reconstruction with the optimum recovery withAs RBFs work satisfactory on non-uniform cells/grids, the proposed central scheme can handle adaptedsimulations, the multiresolution–based grid adaptation approach is then integrated with the RBF-based central

Keywords： central high resolution schemes     RBFs     higher order accuracy     generalized thermoelasticity     multiresolution-based    

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Development of lunar regolith composite and structure via laser-assisted sintering

Frontiers of Mechanical Engineering doi: 10.1007/s11465-021-0662-2

Abstract: The process parameters and composite material compositions are optimized in an appropriate range throughThe optimal combination of composite material compositions and process parameters are mixing ratio ofproperties of laser-sintered lunar regolith composites are implemented to the topology optimization designand the feasibility of this laser-assisted process are potentially developed for future lightweight design

Keywords： > manufacturing     laser-assisted powder fusion process     mechanical properties     topological structure design    

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Ion conduction path in composite solid electrolytes for lithium metal batteries: from polymer rich to

Zhouyu ZHANG, Hao CHEN, Zhenglin HU, Shoubin ZHOU, Lan ZHANG, Jiayan LUO

Frontiers in Energy 2022, Volume 16, Issue 5,   Pages 706-733 doi: 10.1007/s11708-022-0833-9

Abstract: Composite solid electrolytes (CSEs) composed of flexible polymers and brittle but more conducting ceramicsit further prospects the possible route for future development of CSEs according to their rational design

Keywords： composite solid electrolytes     active filler/framework     ion conduction path     interphase compatibility     multilayer design    

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Experimental and statistical investigation of a new concrete-composite beam with encased polymer tube

Abdelmadjid SI SALEM,Souad AIT TALEB,Kamal AIT TAHAR

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 2,   Pages 154-162 doi: 10.1007/s11709-015-0296-8

Abstract: A new concrete-composite beam with high mechanical performances to weight ratio is developed in thisThe proposed design technique consists to embed a cylindrical polymer tube wrapped by a GFRP Jacket inAn experimental investigation is carried out on composite beams under bending loads until failure torepresents a promising revelation regarding the improvement in terms of strength and ductility of such design

Keywords： design     GFRP-Jacket     polymer tube     test     reliability analysis    

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Title Author Date Type Operation

Degradation of refractory organics in concentrated leachate by the Fenton process: Central compositedesign for process optimization

Senem Yazici Guvenc, Gamze Varank

Journal Article

Development of a multi-component drug from turmeric using central composite design

Xiaohang ZHANG,Shengnan HAN,Yan LI,Jianlan JIANG

Journal Article

Statistical modeling of radiolytic (

G. S. Muthu Iswarya, B. Nirkayani, A. Kavithakani, V. C. Padmanaban

Journal Article

Removal of malachite green from aqueous solution by sorption on hydrilla verticillata biomass using response surface methodology

R. RAJESHKANNAN, N. RAJAMOHAN, M. RAJASIMMAN

Journal Article

Trial design of arch bridge of composite box section with steel web-concrete flange

Jiangang WEI, Qingwei HUANG, Baochun CHEN,

Journal Article

Design of composite flywheel rotor

BAI Yue, GAO Qingjia, LI Haiwen, WU Yihui, XUAN Ming

Journal Article

Analysis and design of steel-concrete composite sandwich systems subjected to extreme loads

Kazi Md Abu SOHEL, Jat Yuen Richard LIEW, Min Hong ZHANG

Journal Article

Design concepts of an aircraft wing: composite and morphing airfoil with auxetic structures

P R BUDARAPU,Sudhir Sastry Y B,R NATARAJAN

Journal Article

Seismic performance of fabricated continuous girder bridge with grouting sleeve-prestressed tendon composite

Journal Article

Design and Fabrication of Multiphase Composite Ceramic Tool Materials

Xu Chonghai,Ai Xing

Journal Article

Design of nanofibre interlayer supported forward osmosis composite membranes and its evaluation in fouling

Journal Article

Multiscale RBF-based central high resolution schemes for simulation of generalized thermoelasticity problems

Hassan YOUSEFI, Alireza TAGHAVI KANI, Iradj MAHMOUDZADEH KANI

Journal Article

Development of lunar regolith composite and structure via laser-assisted sintering

Journal Article

Ion conduction path in composite solid electrolytes for lithium metal batteries: from polymer rich to

Zhouyu ZHANG, Hao CHEN, Zhenglin HU, Shoubin ZHOU, Lan ZHANG, Jiayan LUO

Journal Article

Experimental and statistical investigation of a new concrete-composite beam with encased polymer tube

Abdelmadjid SI SALEM,Souad AIT TALEB,Kamal AIT TAHAR

Journal Article