Synthesis of Zeolite-Supported Magnesia-magnetite Nanoparticles and Its Efficient Application in Ultrasound-Assisted Adsorption of Dairy Wastewater: Optimization and Modeling of Process by RSM and ANN

2021 ◽  
Author(s):  
Ali Mehrizad
Keyword(s):  
Mesoporous Structure ◽  
Dairy Wastewater ◽  
Operational Parameters ◽  
Ferromagnetic Property ◽  
Ternary Composite ◽  
Mapping Analysis ◽  
Ultrasound Assisted ◽  
Artificial Neural Network Ann ◽  
Xrd Patterns ◽  
Zeolite Composite

Abstract In the present study, the ternary magnesia-magnetite-zeolite composite was prepared via a facile method. The XRD patterns and EDX-elemental mapping analysis confirmed the formation of composite with components of MgO, Fe3O4, and zeolite. The FE-SEM and TEM images, along with BET-BJH results, corroborated the construction of the composite with appropriate morphology and mesoporous structure (SBET: 68.90 m2 g-1). The VSM analysis demonstrated the ferromagnetic property of the prepared composite (Ms: 8 emu g-1). The as-prepared ternary composite was used for the adsorption of dairy effluent by ultrasound-assisted approach. The optimization of the adsorption operational parameters, employing response surface methodology (RSM), led to a swift reduction in COD (83%). The modeling of the process by artificial neural network (ANN) showed that the adsorbent dosage was the most important factor with 38.30% impact on the COD extent. The adsorption of dairy wastewater by composite was consistent with Temkin isotherm model and the kinetics data were well described by both Ho’s pseudo 2nd order and Elovich models. This indicates that the process is attributed to chemical adsorption. The studies associated with thermodynamics revealed that this process was endothermic (ΔH°> 0) and spontaneous (ΔG°< 0). Accordingly, the MgO-Fe3O4-zeolite could be considered as a potential adsorbent in reducing the COD of dairy wastewater.

A comparative study and combined application of RSM and ANN in adsorptive removal of diuron using biomass ashes

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Sunil K. Deokar ◽  
Nachiket A. Gokhale ◽  
Sachin A. Mandavgane
Keyword(s):  
Three Dimensional ◽  
Current Approach ◽  
Coefficient Of Determination ◽  
Ann Model ◽  
Operational Parameters ◽  
Initial Concentration ◽  
Combined Application ◽  
Artificial Neural Network Ann ◽  
Relationship Of ◽  
Biomass Ashes

Abstract Biomass ashes like rice husk ash (RHA), bagasse fly ash (BFA), were used for aqueous phase removal of a pesticide, diuron. Response surface methodology (RSM) and artificial neural network (ANN) were successfully applied to estimate and optimize the conditions for the maximum diuron adsorption using biomass ashes. The effect of operational parameters such as initial concentration (10–30 mg/L); contact time (0.93–16.07 h) and adsorbent dosage (20–308 mg) on adsorption were studied using central composite design (CCD) matrix. Same design was also employed to gain a training set for ANN. The maximum diuron removal of 88.95 and 99.78% was obtained at initial concentration of 15 mg/L, time of 12 h, RHA dosage of 250 mg and at initial concentration of 14 mg/L, time of 13 h, BFA dosage of 60 mg respectively. Estimation of coefficient of determination (R 2) and mean errors obtained for ANN and RSM (R 2 RHA = 0.976, R 2 BFA = 0.943) proved ANN (R 2 RHA = 0.997, R 2 BFA = 0.982) fits better. By employing RSM coupled with ANN model, the qualitative and quantitative activity relationship of experimental data was visualized in three dimensional spaces. The current approach will be instrumental in providing quick preliminary estimations in process and product development.

The Performance of Au Nanoparticle Supported on Mesoporous TiO2 for Low-Temperature CO Oxidation

2013 ◽  
Vol 726-731 ◽  
pp. 720-724 ◽  
Author(s):  
Jian Hua Li ◽  
Meng Jie Feng ◽  
Mei Lin Jia
Keyword(s):  
Reduction Method ◽  
Catalyst Activity ◽  
Sol Gel ◽  
Mesoporous Structure ◽  
Au Nanoparticle ◽  
Template Method ◽  
Oxidation Of Co ◽  
Low Temperature Co Oxidation ◽  
Xrd Patterns ◽  
Adsorption Desorption

A series of mesoporous TiO2 supports were synthesized by the sol-gel template method by using different surfactant and Au/TiO2 catalysts were prepared by the solution reduction method. The catalytic oxidation of CO was taken as the probe reaction for comparing the catalyst activity. Wide-angle XRD patterns and N2 adsorption–desorption isotherms revealed that the TiO2 with crystallized anatase and mesoporous structure can be synthesized after an optimized sol-gel template method. The results indicated that the pore size of TiO2 plays a key role in the catalyst activity. Among them the activity of Au/TiO2-F1 catalyst synthesized by using the F127 surfactant demonstrated superior activity to other catalysts. CO could be converted at 70 °C.

Structural and Ferromagnetic Properties of Ho-Doped BiFeO3 Films

2017 ◽  
Vol 727 ◽  
pp. 996-1000 ◽  
Author(s):  
Ning An ◽  
Hai Tao Zhang ◽  
Cheng Zhi Liu ◽  
Cun Bo Fan ◽  
Xue Dong ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Raman Spectroscopy ◽  
Room Temperature ◽  
Oxygen Vacancies ◽  
Sol Gel ◽  
Wave Number ◽  
Ferromagnetic Property ◽  
Peak Intensity ◽  
Structure Morphology ◽  
Xrd Patterns

In order to improve the structural and ferromagnetic property of BiFeO3, the effects of Ho3+ doping is systematically investigated. Pure BiFeO3 and Ho-doped BiFeO3 thin films are fabricated by sol-gel method, and the phase structure, morphology, crystalline structure, ferromagnetic are characterized by XRD, SEM, Raman spectra and VSM, respectively. The XRD patterns of the samples indicate that all the compounds crystallize in rhombohedral distorted perovskite structure with space group R3c and the Ho substitution can suppress the intrinsic formation of the miscellaneous phase. The SEM proves that along with the increasing of Ho concentration, the surface roughness of BiFeO3 is decreased due to the reduction of defects in the preparation. From the Raman spectroscopy, it is found that the peak intensity of 8 modes in Bi1-xHoxFeO3 are increased and the modes shift to higher wave number. Besides, the VSM results show that the ferromagnetic of the samples is enhanced with increasing of Ho concentration. When x=0.1, Ms is improved to be 4.8emu/g. The results can prove that the Ho3+ doping can reduce the volatilization of Bi3+, decrease the concentration of oxygen vacancies and improve the room-temperature ferromagnetic of BiFeO3.

Methanogenic Archaea structure under different operational parameters of anaerobic dairy wastewater treatment

2012 ◽  
Vol 29 ◽  
pp. S183
Author(s):  
Magdalena Zielińska ◽  
Agnieszka Cydzik-Kwiatkowska ◽  
Marcin Zieliński ◽  
Marcin Dębowski
Keyword(s):  
Wastewater Treatment ◽  
Methanogenic Archaea ◽  
Dairy Wastewater ◽  
Operational Parameters

Effect of operational parameters on biohydrogen production from dairy wastewater in batch and continuous reactors

Biofuels ◽  
2016 ◽  
Vol 8 (6) ◽  
pp. 693-699 ◽  
Author(s):  
Panga Kirankumar ◽  
S. Vijaya Krishna ◽  
N. Chaitanya ◽  
D. Bhagawan ◽  
V. Himabindu ◽  
...  
Keyword(s):  
Dairy Wastewater ◽  
Biohydrogen Production ◽  
Operational Parameters

scholarly journals Start Up of a UASB Treating Malted Ingredient Manufacturing Wastewater

2018 ◽  
Vol 7 (2) ◽  
pp. 1 ◽  
Author(s):  
Ryland Cairns ◽  
Paul Mead
Keyword(s):  
Manufacturing Industry ◽  
Dairy Wastewater ◽  
Plant Performance ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Biological Interactions ◽  
Operational Parameters ◽  
Start Up ◽  
Stable Conditions

With a greater push to achieve waste management and renewable energy targets technologies such as anaerobic digestion (AD) have increased in popularity. One such technology option is the Upflow Anaerobic Sludge Blanket (UASB) reactor, these have been shown to be a particularly robust option for high strength organic wastewaters, such as those generated by the malted ingredient manufacturing industry. Despite their effectiveness they are reported to have lengthy and complex start ups due to the range of physiochemical and biological interactions influencing sludge blanket stability. This process can be sped up by seeding the plant from sludge from similar plants, however this is not always possible. This paper aims to investigate the start up of a full-scale mesophilic UASB treating malted ingredient wastewater that was initially seeded with a granular sludge treating dairy wastewater. Operational performance during the first 75 days of start up was comparable to that of a fully established plant with a COD removal efficiency in excess of 81.89% and a biogas methane concentration greater than 57.24%. During this period the plant remained operationally robust with the Organic Loading Rates (OLR) exuding the greatest influence on plant performance. Similar to operations during stable conditions key operational parameters such as HRT times, temperatures and pH did not exert a strong influence on the plant. 

scholarly journals Simultaneous Determination of Low Molecule Benzotriazoles and Benzotriazole UV Stabilizers in Wastewater by Ultrasound-Assisted Emulsification Microextraction Followed by GC-MS Detection

2021 ◽  
Author(s):  
Kotowska Urszula ◽  
Struk-Sokołowska Joanna ◽  
Piekutin Janina
Keyword(s):  
Simultaneous Determination ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Dairy Wastewater ◽  
Gas Chromatography Mass Spectrometry ◽  
Municipal Wastewater Treatment ◽  
One Step ◽  
Ultrasound Assisted ◽  
Emulsification Microextraction

Abstract A rapid, sensitive, economically and ecologically friendly method based on one-step ultrasound-assisted emulsification microextraction (USAEME) and in situ derivatization followed by gas chromatography-mass spectrometry (GC-MS) for simultaneous determination of low molecular benzotriazoles (LMBTs) and benzotriazole-based ultraviolet filters (BUVs) was developed. The optimized method allow quantification of benzotriazole (BT), 4-methylbenzotriazole (4MBT), 5-methylbenzotriazole (5MBT); 5-chlorobenzotriazole (5ClBT), 2-(2′-hydroxy-3′-tert-butyl-5′-methylphenyl)-5-chlorobenzortriazole (UV326) and 2-(2′-hydroxy-5′-(1,1,3,3-tetramethylbutyl)phenyl)benzotriazole (UV329) in municipal and industrial (dairy) wastewater. The method was validated using real influent and effluent wastewater and samples at various stages of the purification process. Obtained relative recoveries were between 77 and 137%, limits of detection (LoDs) from 0.001 to 0.035 µg/L, the repeatability expressed by the coefficient of variation (CV) did not exceed 12%. The use of the method for the determination of the tested compounds in municipal and industrial wastewater showed their presence in most of the tested samples, in concentrations from LoD to 6.11 µg/L. The conducted studies of samples from municipal wastewater treatment plant (WWTP) located in north-eastern Poland showed that the effectiveness of benzotriazole removal by this plant is from 29 to 84%. The load of tested compounds released into the environment by this facility ranges from 2 to 269 mg/day/1000 inhabitants.

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