scholarly journals Pretreatment of Color Filter Wastewater towards Biodegradable by Fresnel-Lens-Assisted Solar TiO2Photocatalysis

2012 ◽  
Vol 2012 ◽  
pp. 1-8
Author(s):  
Wen-Shiuh Kuo ◽  
Min-Tian Li
Keyword(s):  
Reaction Time ◽  
Fresnel Lens ◽  
Solar Irradiation ◽  
Treated Wastewater ◽  
Color Filter ◽  
Photocatalytic Process ◽  
High Concentration ◽  
Toc Removal ◽  
Initial Ph ◽  
Critical Process Parameters

The pretreatment of color filter wastewater towards biodegradable by Fresnel-lens-enhanced solar TiO2photocatalytic process was investigated. The experimental design of response surface methodology (RSM) was employed to assess the effect of critical process parameters (including initial pH, TiO2dosage, and reaction time) on pretreatment performance in terms of BOD5/COD, COD and TOC removal efficiency. Appropriate reaction conditions were established as an initial pH of 7.5, a TiO2dosage of 1.5 g/L with a reaction time of 3 h for increasing the BOD5/COD ratio to 0.15, which implied that the treated wastewater would be possibly biodegradable. Meanwhile, the efficiency of COD and TOC removals reached 32.9% and 24.4%, respectively. With the enhancement of Fresnel lens, the required reaction time for improving the biodegradability of wastewater to 0.15 was 1 h only. Moreover, the efficiency of COD and TOC removals was promoted to 37.4% and 25.8%, respectively. This could be mainly due to the concentrated effect of Fresnel lens for solar energy, including an increase of 2 times of solar irradiation and a raising of 15–20°C of wastewater temperature. Consequently, solar TiO2photocatalytic process with the use of a PMMA Fresnel lens could offer an economical and practical alternative for the pretreatment of industry wastewater containing diversified biorefractory pollutants with a high concentration of COD such as color filter wastewater.

scholarly journals Treatment of Color Filter Wastewater by Fresnel Lens Enhanced Solar Photo-Fenton Process

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Wen-shiuh Kuo ◽  
Chia-ling Wu
Keyword(s):  
Solar Energy ◽  
Fenton Reaction ◽  
Fresnel Lens ◽  
Treated Wastewater ◽  
Color Filter ◽  
Fenton Process ◽  
Promoting Effect ◽  
Reaction Conditions ◽  
Initial Ph ◽  
Optimal Reaction

Treatment of color filter wastewater using solar photo-Fenton process enhanced by high-concentrating Fresnel lens was investigated in this paper. Optimal reaction conditions based on response surface methodology (RSM) were established as under an initial pH of 5, a [H2O2]0/COD0ratio of 1~1.35 and a [H2O2]0/[Fe2+]0ratio of 15 for a reaction time of 60 min, which could reach a readily biodegradable level, that is, the biodegradability (BOD5/COD) of wastewater was more than 0.3. With the assistance of Fresnel lens, the solar photo-Fenton process increased the COD degradation rate and mineralization rate by a factor of 4.5 and 6.5, respectively. In addition, the microtoxicity (TU50) of wastewater was almost diminished after a 60 min of treatment, whereas the microtoxicity of treated wastewater without the assistance of Fresnel lens remained a TU50value of 1.166. This could be mainly due to the concentrating effect of Fresnel lens for solar energy, resulting in an increase of 2~3 times of solar light intensity and a raising heat irradiation in terms of 15~30 °C of wastewater temperature. These results revealed that solar energy could be concentrated effectively by using Fresnel lens and showed a significant promoting effect on the photo-Fenton reaction for treating color filter wastewater.

scholarly journals Solar Photocatalytic Degradation of Azo Dye in AqueousTiO2Suspension Assisted by Fresnel Lens

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Wen-Shiuh Kuo ◽  
Wen-Yu Chen
Keyword(s):  
Reaction Time ◽  
Solar Energy ◽  
Photocatalytic Degradation ◽  
Azo Dye ◽  
Fresnel Lens ◽  
Dye Wastewater ◽  
Promoting Effect ◽  
Reaction Conditions ◽  
Initial Ph ◽  
Critical Process Parameters

Solar TiO2photocatalytic process assisted by a Fresnel lens was investigated for treating an azo dye wastewater of Acid Orange 10 (AO10). Response surface methodology (RSM) was employed to assess the effect of critical process parameters (including initial pH of wastewater, concentration of TiO2, and reaction time) on treatment performance in terms of COD and TOC degradation efficiency. Optimized reaction conditions based on the analysis of RSM were established under an initial pH of 6.0, a concentration of TiO2of 1 g/L, and a reaction time of 2 h for reaching a 90% COD and TOC degradation of AO10 wastewater. With the assistance of Fresnel lens, the TOC degradation rate of AO10 wastewater increased significantly from 0.606 h−1and 0.289 h−1to 1.477 h−1and 0.866 h−1in summer (June) season (UV280–400 nm nm: 39.9–44.8 W/m2) and winter (December) season (UV280–400 nm nm: 23.9–26.9 W/m2), respectively. This could be mainly due to the concentrating effect of Fresnel lens for solar energy, resulting in an increase of 2~2.5 times of solar light intensity and a raising heat irradiation in terms of 10~15 °C of wastewater temperature. These results revealed that solar energy could be concentrated effectively by using Fresnel lens and showed a significant promoting effect on the TiO2photocatalytic degradation of dye wastewater.

scholarly journals Application of a Continuous Bipolar Mode Electrocoagulation (CBME) system for polishing distillery wastewater

2019 ◽  
Vol 93 ◽  
pp. 02005 ◽  
Author(s):  
Madhuri Damaraju ◽  
Debraj Bhattacharyya ◽  
Tarun Panda ◽  
Kiran Kumar Kurilla
Keyword(s):  
Reaction Time ◽  
Current Density ◽  
Optimal Point ◽  
Suitable Alternative ◽  
Toc Removal ◽  
Bipolar Mode ◽  
Recalcitrant Carbon ◽  
Initial Ph ◽  
Distillery Wastewater ◽  
Experimental Values

A continuous bipolar mode electrocoagulation (CBME) unit was used in this study for polishing a biologically treated distillery wastewater at laboratory scale. This study focuses on optimizing the process for removal of Total Organic Carbon (TOC) from an anaerobically-treated distillery wastewater. Response surface methodology (RSM) was used for optimizing the process. The study was conducted by varying three operating parameters: Initial pH (2-10), reaction time (0.5-15 min), and current density (13-40 A/sqm). High R-square values, above 0.9, were obtained with ANOVA. Optimal point was observed to be at pH-6.04, Reaction time-11.63 min, current density-39.2 A/sqm. Experimental values of TOC removal at optimal point were found to be 73% against maximum predicted value of 79%. Color removal efficiency was observed to be 85% at the optimal points. It can be concluded that CBME system can be a suitable alternative for removal of recalcitrant carbon and color post-biological treatment in distillery wastewaters.

Catalyst Activity on Landfill Leachate Treatment with CWAO Method

2013 ◽  
Vol 467 ◽  
pp. 127-132
Author(s):  
Qing Yu Wan ◽  
Yong Li Zhang ◽  
Jin Bing Lin
Keyword(s):  
Reaction Time ◽  
Landfill Leachate ◽  
Organic Pollutant ◽  
Catalyst Activity ◽  
Treated Wastewater ◽  
Catalytic Wet Air Oxidation ◽  
Air Oxidation ◽  
Wet Air Oxidation ◽  
High Concentration ◽  
Leachate Treatment

The landfill leachate belongs to typical high concentration and organic pollutant wastewater. In this study, Landfill leachate was treated with Catalytic Wet Air Oxidation (CWAO) method. The monitoring indicators consist of CODCr, absorbance, pH and chroma. The results show that the activity of the catalysts arrange from high to low: Co (NO3)2, Cu (NO3)2, Fe (NO3)3, CuSO4, Fe2(SO4)3, Mn (NO3)2, FeSO4, Zn (NO3)2, Bi (NO3)3, Zr (NO3)2, Ni (NO3)2; For the same kind of metal, the catalytic activity of nitrates is higher than that of sulfates; Relative to the distribution of catalyst, the activity of Co (NO3)2 is the strongest. With the optimized catalyst Co (NO3)2 , the landfill leachate has been treated. With the extension of reaction time, the effluent CODCr, absorbance and chroma reduced, but the wastewater biodegradability indicator B/C improved. At the reaction time of 90 min, the CODCr of landfill leachate reduced to 7176 mg/L, and the absorbance and the chroma reduced to 9.1 and 1600 times, respectively. The above results show that the activity of catalyst Co (NO3)2 is high, and the biochemical indicators B/C of wastewater is higher than the critical value of 0.3. Therefore, the treated wastewater shows the good biodegradability, and the chosen catalyst of Co (NO3)2 presents the high activity.

Ferrate(VI): a novel oxidant for degradation of cationic surfactant – cetylpyridinium bromide

2013 ◽  
Vol 67 (10) ◽  
pp. 2184-2189 ◽  
Author(s):  
Weihua Yang ◽  
Xiaoyan Lin ◽  
Honghui Wang ◽  
Wutao Yang
Keyword(s):  
Reaction Time ◽  
Organic Carbon ◽  
Cationic Surfactants ◽  
Degradation Process ◽  
Order Kinetic ◽  
Cetylpyridinium Bromide ◽  
Operating Variables ◽  
Toc Removal ◽  
Treatment Conditions ◽  
Initial Ph

Ferrate(VI) is an efficient multi-functional water treatment reagent that has several novel properties, such as strong oxidation, absorption, flocculation, disinfection and deodorization. The removal of cationic surfactants based on ferrate (K2FeO4) was performed in the case of cetylpyridinium bromide (CPB). The influence of operating variables on the mineralization efficiency was studied as a function of ferrate dosage, initial pH and reaction time. Total organic carbon (TOC), UV and infrared spectra were performed to gain a better understanding of the degradation process. Results show that the optimal treatment conditions are as follows, solution initial pH is over 5, oxidation time is 5 min and ferrate dosage is 1.5 times that of CPB. The removal efficiency of CPB above 99% and TOC removal percentage of 91.3% can be achieved in minutes. The reaction of CPB with K2FeO4 responds to a second-order kinetic law.

Effective removal of cefazolin from hospital wastewater by the electrocoagulation process

2019 ◽  
Vol 80 (12) ◽  
pp. 2422-2429 ◽  
Author(s):  
Yahya Esfandyari ◽  
Keivan Saeb ◽  
Ahmad Tavana ◽  
Aptin Rahnavard ◽  
Farid Gholamreza Fahimi
Keyword(s):  
Reaction Time ◽  
Removal Efficiency ◽  
Oxygen Demand ◽  
Input Voltage ◽  
Treated Wastewater ◽  
Hospital Wastewater ◽  
High Concentration ◽  
Effective Removal ◽  
Effects Of Ph ◽  
Electrocoagulation Process

Abstract The present study evaluated the treatment of hospital wastewater by the electrocoagulation process using aluminum and iron electrodes. The effects of pH, voltage and reaction time on the removal efficiencies of the antibiotic cefazolin, chemical oxygen demand (COD) and turbidity were investigated. The results showed that by increasing reaction time and input voltage, the removal efficiency of pollutants was increased. The highest removal efficiency of cefazolin, COD, and turbidity occurred at neutral pH, which may have been related to the formation of aluminum hydroxide (Al(OH)3) flocs through the combination of aluminum released from the surface of the electrode and the hydroxide ions present in the solution. The conductivity of the treated wastewater at neutral to alkaline pH decreased compared to acidic pH, which may have been due to the adsorption of anions and cations from the solution by the Al(OH)3 flocs. The electrode and energy consumption in the present study was higher than in other studies, which may have been due to the high concentration of COD in and the turbidity of the solution.

Catalytic Wet Peroxide Oxidation of Epoxy Resin Wastewater for Reusing

2013 ◽  
Vol 788 ◽  
pp. 263-267
Author(s):  
Fang Hong ◽  
Guo Min Cao ◽  
Xiao Dan Shuai ◽  
Mei Sheng
Keyword(s):  
Epoxy Resin ◽  
Electrolytic Cell ◽  
Treated Wastewater ◽  
Peroxide Oxidation ◽  
High Concentration ◽  
Toc Removal ◽  
Wet Peroxide Oxidation ◽  
One Step ◽  
Catalytic Wet Peroxide Oxidation ◽  
The One

To remove the organic compounds from epoxy resin wastewater which contains high concentration sodium chloride, a catalytic wet peroxide oxidation (CWPO) process was applied to treat it. The effect of different reaction conditions on total organic carbon (TOC) removal efficiency was evaluated, and the experimental results showed that the optimal H2O2 dosage, Fe2+ dosage, temperature, and pH were 0.735 M, 0.027 M, 90oC and 3.0, respectively. Multiple additive methods of H2O2 and Fe2+ significantly enhanced TOC removal than the one step addition. The TOC value of treated wastewater was lower than its limit for diaphragm electrolytic cell feed, thus it could be recycled to a chloro-alkali process for reusing.

Catalytic wet air oxidation of dyeing and printing wastewater

1997 ◽  
Vol 35 (4) ◽  
pp. 311-319 ◽  
Author(s):  
L. Lei ◽  
X. Hu ◽  
H. P. Chu ◽  
G. Chen ◽  
P. L. Yue
Keyword(s):  
High Pressure ◽  
Reaction Time ◽  
Textile Industry ◽  
Porous Alumina ◽  
Supported Catalyst ◽  
Metal Salts ◽  
Treated Wastewater ◽  
Catalytic Wet Air Oxidation ◽  
Air Oxidation ◽  
Wet Air Oxidation

The treatment of dyeing and printing wastewater from the textile industry by oxidation was studied. The reaction was carried out in a two-litre high pressure reactor. In order to promote the oxidation of organic pollutants present in the wastewater, experiments were conducted using various catalysts including metal salts, metal oxides, and porous alumina supported metals. All catalysts tested were able to enhance the conversion of organic compounds in wastewater, shorten the reaction time, and lower the reaction temperature. The alumina supported catalyst has an advantage over other catalysts in that it can be easily separated from the treated wastewater by filtration and recycled. The conditions in preparing the catalyst supported by porous alumina were experimentally optimised.

scholarly journals Ti/RuO2-IrO2-SnO2 Anode for Electrochemical Degradation of Pollutants in Pharmaceutical Wastewater: Optimization and Degradation Performances

2020 ◽  
Vol 13 (1) ◽  
pp. 126
Author(s):  
Guozhen Zhang ◽  
Xingxing Huang ◽  
Jinye Ma ◽  
Fuping Wu ◽  
Tianhong Zhou
Keyword(s):  
Removal Rate ◽  
Inorganic Compounds ◽  
Oxide Coating ◽  
X Ray Diffraction ◽  
Pharmaceutical Wastewater ◽  
High Concentration ◽  
Dimensionally Stable Anodes ◽  
X Ray ◽  
Initial Ph ◽  
Cod Removal Rate

Electrochemical oxidation technology is an effective technique to treat high-concentration wastewater, which can directly oxidize refractory pollutants into simple inorganic compounds such as H2O and CO2. In this work, two-dimensionally stable anodes, Ti/RuO2-IrO2-SnO2, have been developed in order to degrade organic pollutants from pharmaceutical wastewater. Characterization by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD) showed that the oxide coating was successfully fabricated on the Ti plate surface. Electrocatalytic oxidation conditions of high concentration pharmaceutical wastewater was discussed and optimized, and the best results showed that the COD removal rate was 95.92% with the energy consumption was 58.09 kW·h/kgCOD under the electrode distance of 3 cm, current density of 8 mA/cm2, initial pH of 2, and air flow of 18 L/min.

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