scholarly journals Study of the Degradation of Trimethoprim Using Photo-Fenton Oxidation Technology

Water ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 207 ◽  
Author(s):  
Qi Wang ◽  
Wenjing Pang ◽  
Yingdan Mao ◽  
Quan Sun ◽  
Pengfei Zhang ◽  
...  
Keyword(s):  
High Performance ◽  
Degradation Rate ◽  
Fenton Oxidation ◽  
Design Experiment ◽  
H2o2 Concentration ◽  
Optimal Conditions ◽  
Single Factor ◽  
Experimental Conditions ◽  
Oxidation Technology ◽  
Central Composite

Trimethoprim is one of the representative drugs within the pharmaceutical and personal care products (PPCPs) group. The photo-Fenton oxidation technology was used to degrade trimethoprim in wastewater and the extent of degradation was analyzed by using high-performance liquid chromatography, then experimentally obtained the optimal conditions. Analysis of the experimental data showed that, under the single-factor experimental conditions, the optimal conditions for degradation were a pH of 4, an H2O2 concentration of 3.0 mmol/L, an FeSO4 concentration of 0.06 mmol/L, an initial trimethoprim concentration of 0.0689 mmol/L, and an ultraviolet (UV) intensity (UVA) of 12 mW/cm2. The interaction of pH and the concentration of H2O2 and Fe2+ have been further explored, it was obtained the following response surface results through the central composite design experiment: pH = 4.56, H2O2 concentration = 0.09 mmol/L, and Fe2+ concentration = 0.09 mmol/L. Under these conditions, it can be obtained a degradation rate of 99.95% after 6 min. There were similar results for three sets of parallel experiments, indicating that these simulation conditions were feasible.

scholarly journals Treatment of High-Strength Animal Industrial Wastewater Using Photo-Assisted Fenton Oxidation Coupled to Photocatalytic Technology

Water ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1553 ◽  
Author(s):  
Jae Hong Park ◽  
Dong Seok Shin ◽  
Jae Kwan Lee
Keyword(s):  
Light Intensity ◽  
Removal Efficiency ◽  
Industrial Wastewater ◽  
Uv Light ◽  
High Strength ◽  
Cod Removal ◽  
Fenton Oxidation ◽  
Optimal Conditions ◽  
Experimental Conditions ◽  
Animal Wastewater

Animal wastewater is one of the wastewaters that has a color and is difficult to treat because it contains a large amount of non-degradable organic materials. The photo-assisted Fenton oxidation technique was applied to treat animal wastewater, and the optimal conditions of chemical oxygen demands (COD) removal were analyzed according to changes in pH, ferrous ion, H2O2, and ultraviolet (UV) light intensity as a single experimental condition. Experimental results showed that, under the single-factor experimental conditions, the optimal conditions for degradation of animal wastewater were pH 3.5, Fe(II) 0.01 M, H2O2 0.1 M, light intensity 3.524 mW/m2. Under the optimal conditions, COD removal efficiency was 91%, sludge production was 2.5 mL from 100 mL of solution, color removal efficiency was 80%, and coliform removal efficiency was 99.5%.

scholarly journals Statistical Optimization of Operational Parameters for Enhanced Naphthalene Degradation by Photocatalyst

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Aijuan Zhou ◽  
Jing Peng ◽  
Zhaobo Chen ◽  
Jingwen Du ◽  
Zechong Guo ◽  
...  
Keyword(s):  
Degradation Rate ◽  
Design Method ◽  
Irradiation Time ◽  
Catalyst Loading ◽  
Statistical Experimental Design ◽  
Optimal Conditions ◽  
Operational Parameters ◽  
Excellent Correlation ◽  
Naphthalene Degradation ◽  
Central Composite

The optimization of operational parameters for enhanced naphthalene degradation by TiO2/Fe3O4-SiO2(TFS) photocatalyst was conducted using statistical experimental design and analysis. Central composite design method of response surface methodology (RSM) was adopted to investigate the optimum value of the selected factors for achieving maximum naphthalene degradation. Experimental results showed that irradiation time, pH, and TFS photocatalyst loading had significant influence on naphthalene degradation and the maximum degradation rate of 97.39% was predicted when the operational parameters were irradiation time 97.1 min, pH 2.1, and catalyst loading 0.962 g/L, respectively. The results were further verified by repeated experiments under optimal conditions. The excellent correlation between predicted and measured values further confirmed the validity and practicability of this statistical optimum strategy.

scholarly journals Paracetamol degradation by photo-activated peroxydisulfate process (UV/PDS): kinetic study and optimization using central composite design

2020 ◽  
Vol 82 (7) ◽  
pp. 1404-1415 ◽  
Author(s):  
Karima Dibene ◽  
Idris Yahiaoui ◽  
Lamia Yahia Cherif ◽  
Salima Aitali ◽  
Abdeltif Amrane ◽  
...  
Keyword(s):  
Reaction Time ◽  
Central Composite Design ◽  
Degradation Rate ◽  
Degradation Efficiency ◽  
Order Kinetic ◽  
Optimal Conditions ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Central Composite ◽  
Optimal Ph

Abstract In this study, peroxydisulfate (PDS) was successfully activated by UV-irradiation for the degradation of paracetamol (PCT) frequently detected in the environment. Results showed that increasing the initial PDS concentration from 5 to 20 mM promote the removal of PCT from 49.3% to 97.5% after 240 min of reaction time. As the initial PCT concentration increased from 0.066 to 0.132 mM, the degradation efficiency of PCT decreased from 98% to 73% after 240 min of reaction time, while the optimal pH was found to be 6. It is apparent that the degradation rate of PCT was favored by the lamp power regardless of the initial PCT concentration, for 0.132 mM of PCT, the degradation efficiency increased from 73% to 95% when the lamp power increased from 9 to 30 W, respectively. The kinetic of degradation of the PCT was described by a pseudo-second order kinetic model. The model obtained by central composite design led to the following optimal conditions for PCT degradation: 0.132 mM initial PCT concentration, 20 mM PDS dose, pH solution 6 and lamp power 30 W led to the removal of 92% of PCT at 25 °C within 240 min of reaction time.

Application of response surface method to carbamazepine removal in photo-ozonation reaction under alkaline condition

2013 ◽  
Vol 67 (1) ◽  
pp. 74-81 ◽  
Author(s):  
J. K. Im ◽  
K. D. Zoh
Keyword(s):  
Response Surface ◽  
Radical Scavenging ◽  
Alkaline Condition ◽  
H2o2 Concentration ◽  
Experimental Conditions ◽  
Scavenging Effect ◽  
Surface Method ◽  
Alkaline Conditions ◽  
Radical Scavenging Effect ◽  
Central Composite

In this study, the photo-ozonation reaction for carbamazepine (CBZ) removal was investigated under alkaline conditions. Response surface methodology based on a central composite design was used to obtain the optimum experimental conditions, and examine both main and interaction effects of the photo-ozonation reaction variables such as O3 concentration, H2O2 concentration and UV intensity. The level of O3 concentration significantly influenced CBZ removal (p < 0.001). CBZ removal increased with increasing both O3 and H2O2 concentration up to a certain level, whereas further increase in O3 and H2O2 concentration resulted in an adverse effect due to the hydroxyl radical scavenging effect. The optimum conditions for complete CBZ removal at pH 9 were found to be 0.89 mg of O3 l−1, 4.85 mg of H2O2 l−1 and 3.18 mW of UV intensity cm−2, respectively.

scholarly journals Study on Fenton-like degradation of bisphenol A by α-MnO2 and α-MnO2/AC (1:1, w/w)

2021 ◽  
Author(s):  
Junqing You ◽  
Xihui Zhang ◽  
Jinglei Chen
Keyword(s):  
Bisphenol A ◽  
Industrial Wastewater ◽  
Degradation Rate ◽  
Optimal Conditions ◽  
Heterogeneous Fenton ◽  
Simple Method ◽  
Orthogonal Experiments ◽  
Advanced Oxidation Technology ◽  
Oxidation Technology ◽  
Neutral Conditions

Abstract Bisphenol A is used in various industrial productions and large amounts of industrial wastewater containing bisphenol A is produced. Heterogeneous Fenton-like process in advanced oxidation technology can oxidize and degrade most organic compounds non-selectively, and it has become an effective method to treat bisphenol A. The aim is to overcome the shortcomings of the traditional Fenton method and synthesize catalysts by a simple method, which can help to degrade bisphenol A effectively under neutral conditions, with less catalyst and less H2O2 consumption. In this experiment, α-MnO2 and α-MnO2/AC (1:1, w/w) were synthesized by a simple method, and the degradation rate of bisphenol A by α-MnO2 and α-MnO2/AC (1:1, w/w) under different conditions were studied. The optimal conditions for the degradation of bisphenol A by the two materials were determined by single factor and orthogonal experiments. When the dosage of α-MnO2 catalyst is 6.5g/L and the concentration of H2O2 is 200 mg/L with pH = 4.5 at 328K, the degradation rate of 50mg/L bisphenol A can reach 91.02% within 70 minutes. When α-MnO2/AC (1:1, w/w) has a catalyst dosage of 1.5g/L, at 298K with no pH adjustment, the degradation rate of 50 mg/L of bisphenol A within 70 minutes can be reached 94.17%.

Screening of Lincomycin-Degrading Bacteria by Silica Gel Plate and Visible Spectrophotometry

2011 ◽  
Vol 183-185 ◽  
pp. 1153-1157
Author(s):  
Ying Wang ◽  
Gang Xue ◽  
Bin Zhao
Keyword(s):  
Silica Gel ◽  
Degradation Rate ◽  
Antibiotic Residues ◽  
Optimal Conditions ◽  
Experimental Conditions ◽  
Calibration Standards ◽  
Visible Spectrophotometry ◽  
Experimental Scheme ◽  
Degrading Bacteria ◽  
Waste Mycelium

Due to the existence of antibiotic residues, waste mycelium of lincomycin was difficult to be treated and used as resources, which had become a major problem in the production enterprise. So it is very necessary to isolate and screen lincomycin - degrading bacteria to biodegrade the waste mycelium. In this paper, Box-Behnken Experimental Scheme was performed to optimize the experimental conditions for the treatment of silica gel plates, and the visible spectrophotometry was used to determine the concentration of lincomycin in the silica gel plates to indicate the degradation capacity. The results showed that the optimal conditions were to add 4 ml of water to a silica gel plate, and immerse for 40min, and repeat this process for four times. Under these conditions, the linear correlation between the lincomycin concentration and absorbance was satisfactory in the calibration standards at the range of 0-5mg/ml (r=0.99976). The method precision values (RSD=0.1126%), accuracy values (RSD=0.2358%), reproducibility values (RSD=0.2358%), stability values (RSD=0.1129%) and recovery values (98.1318%) of lincomycin in silica gel aqueous solution were adequate. Application of this method to 1311 strain showed the lincomycin - degradation rate was of 35.81±2%. Taken together, we have established a simple, convenient, rapid and valid visible spectrophotometry method to detect lincomycin in silica gel plates for screening lincomycin - degrading bacteria.

Effect of Supercritical Carbon Dioxide Dyeing Procedure on Mechanical Property of Wool Fiber

2014 ◽  
Vol 1048 ◽  
pp. 17-20 ◽  
Author(s):  
Peng Peng Yin ◽  
Lai Jiu Zheng ◽  
Yan Yun Wu ◽  
Zhong Tao Gao ◽  
Bing Du
Keyword(s):  
Carbon Dioxide ◽  
Mechanical Property ◽  
Supercritical Carbon Dioxide ◽  
Wool Fiber ◽  
Design Experiment ◽  
Optimal Conditions ◽  
Single Factor ◽  
Single Factor Experiment ◽  
Supercritical Carbon

In this paper, the effects of dyeing temperature, pressure, and time on mechanical property of wool fiber were investigated in supercritical carbon dioxide fluid. In addition, On the basis of single factor experiment, the optimal technological conditions for dyed wool fiber was optimized by employing Box-Benhnken Design experiment, and the optimal conditions were as following: dyeing temperature 110 °C, dyeing pressure 25 MPa and dyeing time 75 min.

scholarly journals Degradation of N-methylpyrrolidone in High Salinity Wastewater by a Halotolerant Microorganism

2020 ◽  
Vol 11 (1) ◽  
pp. 218
Author(s):  
Guorui Zhang ◽  
Ran Xia ◽  
Jing Wang ◽  
Liqun Wang
Keyword(s):  
Lithium Batteries ◽  
High Performance ◽  
High Salinity ◽  
Industrial Applications ◽  
Degradation Efficiency ◽  
Processing Conditions ◽  
Optimal Conditions ◽  
Single Factor ◽  
Rdna Sequencing ◽  
Salinity Wastewater

N-methylpyrrolidone (NMP), a nitrogen-containing heterocyclic compound, is widely used in lithium batteries and the refining of lubricants. However, it is also very harmful to human health and the environment. Although NMP is biodegradable, industrial high salinity wastewater can stop microorganisms from growing. To effectively degrade NMP in high salinity wastewater, a halotolerant strain CCZU-X was isolated from sea shrimps. The strain was identified as Staphylococcus lentus through morphology observation and 16S rDNA sequencing. The effects of processing conditions such as salt concentration, pH, and temperature on degradation of high salinity NMP-containing wastewater were investigated using single-factor experiments. Quantitative analysis of degradation efficiency of NMP was conducted by high-performance liquid chromatography. The optimal conditions for CCZU-X to degrade NMP in high salinity wastewater were determined to be at pH 7.0 and 35 °C, and the maximum salt tolerance was 25%. Under optimal conditions (pH 7.0, 35 °C, 1% salt, 2000 mg/L NMP), the NMP degradation efficiency of CCZU-X reached 93%. This strain can effectively degrade NMP in high salinity NMP-containing wastewater, thus can be potentially used in industrial applications.

A Simple Method for Estimation of Lipoxygenase and Cyclo-Oxygenase Pathways in Human Platelets - the Use of Thiobarbituric Acid Reaction

1980 ◽  
Vol 44 (02) ◽  
pp. 111-114 ◽  
Author(s):  
Hiroshi Takayama ◽  
Minoru Okuma ◽  
Haruto Uchino
Keyword(s):  
Time Course ◽  
Normal Values ◽  
Human Platelet ◽  
Thiobarbituric Acid ◽  
Human Platelets ◽  
Optimal Conditions ◽  
Experimental Conditions ◽  
Simple Method ◽  
Acid Reaction ◽  
Optimal Ph

SummaryTo develop a simple method for estimation of platelet lipoxygenase (PLO) and cyclo-oxygenase (PCO) pathways, the arachidonic acid (AA) metabolism of human platelet was investigated under various experimental conditions by the use of the thiobarbituric acid (TBA) reaction and a radioisotope technique. A TBA-reactive substance different from malondialdehyde (MDA) via PCO pathway was detected and shown to be derived from the PLO pathway. Since the optimal pH and time course of its formation were different from those of MDA formation via PCO pathway, PLO and PCO pathways were estimated by quantitating the TBA-reactive substances produced by the incubation of AA either with aspirin-treated platelets or with untreated ones, respectively, each under optimal conditions. Normal values expressed in terms of nmol MDA/108 platelets were 1.17±0.34 (M±SD, n = 31) and 0.79±0.15 (n = 31) for PLO and PCO pathways, respectively.

Computational simulation applied to improve fuel bioethanol distillation

2013 ◽  
pp. 645-650
Author(s):  
Fabio R.M. Batista ◽  
Antonio J.A. Meirelles
Keyword(s):  
Experimental Validation ◽  
Computational Simulation ◽  
Industrial Plant ◽  
Careful Study ◽  
Optimal Conditions ◽  
Liquid Equilibrium ◽  
Steam Consumption ◽  
Wine Composition ◽  
Standard Solution ◽  
Central Composite

Experimental validation of the process simulation a typical industrial bioethanol unit was conducted, comparing the obtained results with the information collected in an industrial plant. A standard solution containing water, ethanol and 17 congeners was chosen to represent the fermented must, whose composition was selected according to analyses of samples of industrial wines. A careful study of the vapour-liquid equilibrium of the wine components was performed. An attempt to optimise the industrial plant was conducted considering two optimising approaches: the central composite design (CCD) and the Sequential Quadratic Programming (SQP). The process was investigated in terms of bioethanol alcoholic graduation, ethanol recovery, energy consumption and ethanol loss. The results showed that the simulation approach was capable of correctly reproducing a real plant of bioethanol distillation and that the optimal conditions are slightly different from those used at the industrial plant investigated. Substantial fluctuations in wine composition were easily controlled for the two loop controls preventing an off-specification product. The optimised conditions indicate a distillation process able to produce bioethanol according to the legislation requirements and with appropriate steam consumption and loss of ethanol. However, for the production of alcohols with superior qualities, substantial changes in the production system may be required.

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