Experimental Study on Photocatalytic Pretreatment of Restaurant Wastewater with Nano TiO2

2013 ◽  
Vol 807-809 ◽  
pp. 1575-1578
Author(s):  
Jin Yong Huang ◽  
Li Bin Peng ◽  
Lin Peng
Keyword(s):  
Experimental Study ◽  
Removal Efficiency ◽  
Biological Treatment ◽  
Photocatalytic Oxidation ◽  
Proper Time ◽  
Irradiation Time ◽  
Optimal Conditions ◽  
Oxidation Technology ◽  
Restaurant Wastewater

The study aims at investigating the performance of nanoTiO2photocatalytic oxidation technology for the pretreatment of restaurant wastewater. The rate of lipids removal depends on conditions, such as irradiation time, TiO2dosage, aeration and addition of Fe3+or H2O2.The optimal conditions are determined: proper time of irradiation 10 min, TiO2dosage 25mg/L,pH6.0, adding 5mL Fe3+. Under this optimum, the removal efficiency of lipids reaches 74.7 ~ 88.6%, and that of CODcr was around 45.2~76.2%.While using illumination for 10 min, companied with TiO2and Fe3+/H2O2, the removal efficiency of Grease could increase by 3%~15%.Thus, satisfactory results were achieved for pretreatment of Grease Wastewater from restaurant, and this technique could be used as a pretreatment step for next biological treatment of restaurant wastewater.

scholarly journals Examination of Photocatalyzed Chlorophenols for Sequential Photocatalytic-Biological Treatment Optimization

Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 985
Author(s):  
Liliana Bobirică ◽  
Constantin Bobirică ◽  
Cristina Orbeci
Keyword(s):  
Aqueous Solutions ◽  
Biological Treatment ◽  
Photocatalytic Oxidation ◽  
Irradiation Time ◽  
Oxygen Demand ◽  
Organic Content ◽  
Aquatic Environments ◽  
Treatment Optimization ◽  
Average Value ◽  
Irradiation Period

Given the known adverse effect of chlorophenols for the aquatic environments which they can reach, the development of efficient methods both technically and economically to remove them has gained increasing attention over time. The combination of photocatalytic oxidation with biological treatment can lead to high removal efficiencies of chlorophenols, while reducing the costs associated with the need to treat large volumes of aqueous solutions. Therefore, the present paper had as its main objective the identification of the minimum photocatalytic oxidation period during which the aqueous solutions of 4-chlorophenol and 2,4-dichlorophenol can be considered as readily biodegradable. Thus, the results of photocatalytic oxidation and biodegradability tests showed that, regardless of the concentration of chlorophenol and its type, the working solutions become readily biodegradable after up to 120 min of irradiation in ultraviolet light. At this irradiation time, the maximum organic content of the aqueous solution is less than 40%, and the biochemical oxygen demand and chemical oxygen demand (BOD/COD) ratio is much higher than 0.4. The maximum specific heterotrophic growth rate of activated sludge has an average value of 4.221 d−1 for 4-chlorophenol, and 3.126 d−1 for 2,4-dichlorophenol. This irradiation period represents at most half of the total irradiation period necessary for the complete mineralization of the working solutions. The results obtained were correlated with the intermediates identified during the photocatalytic oxidation. It seems that, working solutions initially containing 4-chlorophenol can more easily form readily biodegradable intermediates.

scholarly journals Development of Ti-Bi-based nanomaterials to purify mercury in the simulated flue gas

2018 ◽  
Vol 53 ◽  
pp. 01029 ◽  
Author(s):  
Yu Guan ◽  
Lingjie Yu ◽  
Jiang Wu ◽  
Xiaoming Sun
Keyword(s):  
Removal Efficiency ◽  
Flue Gas ◽  
Photocatalytic Oxidation ◽  
Surface Defect ◽  
New Technology ◽  
Development Stage ◽  
Transfer Velocity ◽  
Experimental Development ◽  
Oxidation Technology ◽  
Calcination Method

The photocatalytic oxidation technology is a new technology for the oxidation treatment of Hg0 developed in the existing Wet Flue Gas Desulfurization (WFGD) equipment, in which the removal efficiency of Hg2+ is high and the removal efficiency of Hg0 is very low. When ultraviolet light (UV) is used to irradiate a substance containing TiO2 to pass the flue gas, photocatalytic catalytic oxidation reaction occurs, and Hg0 is oxidized to Hg2+, which is easily absorbed later in the WFGD apparatus, thereby improving the removal efficiency of mercury. The technology is still in the experimental development stage and needs further research. It has brought widespread interests to introduce surface defect or form interface heterostructure to improve the photocatalytic activity of the nanomaterials. The Ti-Bi-based nanomaterial photocatalyst with defect TiO2/BiOIO3 heterostructure has been fabricated via calcination method. The results showed that to introduce surface defect and form interface heterostructure on photocatalysts together can increase the response of the visible light, promoting the transfer velocity of the photocarriers and in turn suppressing the recombination of photo-generated electrons and holes, and this may become a developing trend in the near future.

scholarly journals Magnetic nano-biocomposite CuFe2 O4 @methylcellulose (MC) prepared as a new nano-photocatalyst for degradation of ciprofloxacin from aqueous solution

2019 ◽  
Vol 6 (1) ◽  
pp. 41-51 ◽  
Author(s):  
Alireza Nasiri ◽  
Fatemeh Tamaddon ◽  
Mohammad Hossein Mosslemin ◽  
Majid Amiri Gharaghani ◽  
Ali Asadipour
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Degradation ◽  
Removal Efficiency ◽  
Bacterial Resistance ◽  
High Efficiency ◽  
Irradiation Time ◽  
Order Kinetic ◽  
Optimal Conditions ◽  
Effective Parameters ◽  
Degradation Kinetic

Background: Antibiotics such as ciprofloxacin (CIP) are even more important in bacterial resistance, even at low concentrations. The aim of this research was to synthesize CuFe2 O4 @methylcellulose (MC) as a new nano-photocatalyst for degradation of CIP from aqueous solution. Methods: The nano-photocatalyst (CuFe2 O4 @MC) was characterized by FESEM, energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and Fourier transform infrared (FTIR), thermogravimetric analysis (TGA), and vibrating sample magnetometer (VSM). Powder XRD and EDS analysis confirmed the formation of pure-phase spinel ferrites. After CuFe2 O4 @MC characterization, the effective parameters in removal efficiency of CIP such as reaction time, initial antibiotic concentration, pH, photocatalyst loading, and degradation kinetic were investigated and conditions were optimized. Then, CIP degradation experiments were conducted on the real sample in the optimal conditions. The removal of chemical oxygen demand (COD) was determined under optimum conditions. Results: The structural characterization of the magnetic nanobiocomposite showed that it is in nanoscale, ferromagnetic property, and thermal stability. The optimal conditions were obtained at pH = 7, irradiation time (90 minutes), photocatalyst loading (0.2 g), and initial concentration of CIP (3 mg/L). The removal efficiency of CIP in the optimal conditions was obtained as 80.74% and 72.87% from the synthetic and real samples, respectively. The removal of COD was obtained as 68.26% in this process. The evaluation of kinetic linear models showed that the photocatalytic degradation process was fitted by pseudo-first order kinetic model and Langmuir-Hinshelwood. CuFe2 O4 @MC photocatalyst had a good stability and reusability for the fourth runs. Conclusion: The photocatalytic degradation of CIP from aqueous media with CuFe2 O4 @MC photocatalyst has a high efficiency, which can be used in the treatment of pharmaceutical wastewaters.

Experimental Study on Photocatalytic Oxidation of Reactive Gaudy Red-3B Dye Wastewater by Microwave Enhanced TiO2/AC Photocatalyst

2013 ◽  
Vol 807-809 ◽  
pp. 1530-1533
Author(s):  
Ya Feng Li ◽  
Sha Liu ◽  
Xi Yang
Keyword(s):  
Experimental Study ◽  
Microwave Irradiation ◽  
Treatment Effect ◽  
Photocatalytic Oxidation ◽  
Irradiation Time ◽  
Preparation Process ◽  
Dye Wastewater ◽  
Effect Factors ◽  
Initial Concentration ◽  
Red Dye

Using microwave enhanced TiO2/AC photocatalyst to photocatalytic oxidation reactive gaudy red dye wastewater.Inspected the influence of the microwave irradiation time and microwave power on the preparation process, and comparative study the influencing treatment effect factors like the initial concentration of wastewater, photocatalyst using times and photocatalyst dosage.The results showed that:the irradiation time is 1min on 520W ,the photocatalyst activity is the highest . The initial concentration of wastewater is 50mg/L, 10.0g/L of dosage, the best decolorization rate is 95.6%, Compared to the no enhanced, the improvement for photocatalyst increased by 8.7%., indicating that the microwave enhanced TiO2/AC photocatalyst can effectively improve the treatment effect of dye wastewater.

Experimental Study on the Preparation of Nutshell Activated Carbon and the Disposal of Catering Wastewater

2014 ◽  
Vol 675-677 ◽  
pp. 530-533
Author(s):  
Jin Yong Huang ◽  
Ming Qin ◽  
Qiu Ping Peng ◽  
Sha Wen ◽  
Yong Xiang Zhang
Keyword(s):  
Experimental Study ◽  
Methylene Blue ◽  
Activated Carbon ◽  
Reaction Temperature ◽  
Proper Time ◽  
Removal Rate ◽  
Optimal Conditions ◽  
Time Of Reaction

The study used self-made nutshell activated carbon and took catering wastewater as research object. After pretreatment, the catering wastewater was adsorbed by nutshell activated carbon.Throught investigating the adsorption value of methylene blue and iodine,the effect of Peach pit shell activated carbon is higher than others.The optimal conditions are determined: proper time of reaction 4 h, Peach shell activated carbon dosage 30 mg/L, pH 6.0, reaction temperature 30°C. Under this optimum, the removal rate of CODcr as well as grease can be as high as 92.75% and 87.05%, respectively.

Experimental Study on Biological Treatment of Organic Waste Gas from Laboratory

2013 ◽  
Vol 316-317 ◽  
pp. 273-278
Author(s):  
Hao Lei Sha ◽  
Guo Jian Xie
Keyword(s):  
Experimental Study ◽  
Removal Efficiency ◽  
Biological Treatment ◽  
Organic Waste ◽  
Total Volatile ◽  
Waste Gas ◽  
Volatile Organic ◽  
Hydrophobic Pollutants ◽  
Benzene Toluene ◽  
Total Volatile Organic Compounds

The removal effect of simulation waste gas from laboratory, and the removal ability of benzene, toluene, xylene, ethanol, acetone, ethyl acetate and methane were studied in a biofilter tower. During the stable running period, the results showed that the removal efficiency of total volatile organic compounds (TVOCs) remained above 85%, when the inlet concentrations were 124~380 mg۰m-3. The removal efficiency of hydrophilic pollutants were higher than that of hydrophobic pollutants. The results proved that the biofilter tower was feasible to remove the organic waste gas from laboratory.

scholarly journals Photocatalytic disinfection of water polluted by Pseudomonas Aeruginosa

2013 ◽  
Vol 9 (2) ◽  
pp. 132-136
Keyword(s):  
Cell Wall ◽  
Ascorbic Acid ◽  
Removal Efficiency ◽  
Uv Irradiation ◽  
Photocatalytic Oxidation ◽  
Irradiation Time ◽  
Cell Mass ◽  
Treatment Method ◽  
Inhibitory Effect ◽  
Intact Cells

Photocatalysis by titanium dioxide (TiO2) is a water treatment method. Pseudomonas aeruginosa is a microorganism resistant to chlorine and UV-C irradiation. TiO2 photocatalytic technology can destroy bacteria, which are resistant to oxidative destruction of cell membrane caused by sole UV irradiation. This study aims to investigate the total mineralization of the bacterium (P. aeruginosa) to the extent of death and cell-mass destruction using TiO2 photocatalytic oxidation process. In this work the effects of parameters such as amount of TiO2, irradiation time, initial concentration of bacterium, presence of ascorbic acid and effect of cell wall on removal of P. aeruginosa were studied. The data, which were obtained in this study, showed that the optimum concentration of TiO2 was 325 ppm. Also at the initial concentration of TiO2 equal to 325 ppm and initial microorganism MPN / 100 ml equal to 300 and after 75 min UV irradiation time, P. aeruginosa removal efficiency was 94.3 %. Removal efficiency of P. aeruginosa in the absence of TiO2 or UV irradiation was very low. Decreasing the concentration of microorganisms increased its removal efficiency. Removal efficiency of spheroplast cells was more than intact cells of P. aeruginosa, which shows the important role of cell wall on cell resistance against chemical agents. Ascorbic acid had inhibitory effect on this process.

Experimental Study on the Optimal Thickness of Infiltration Media of the CRI System

2011 ◽  
Vol 415-417 ◽  
pp. 1703-1707
Author(s):  
Jun Min Chen ◽  
Xiao Lin Yao
Keyword(s):  
Experimental Study ◽  
Removal Efficiency ◽  
Significant Influence ◽  
Soil Column ◽  
Experimental Results ◽  
Artificial Soil ◽  
Optimal Thickness ◽  
Effluent Quality ◽  
Anaerobic Zone

Abstract. In order to investigate the optimal thickness of infiltration media in the Constructed Rapid Infiltration System, the artificial soil column is used to simulate the Constructed Rapid Infiltration System, and the CODCr, NH3-N and TN concentrations of the effluent from all the sampling sites are monitored. The experimental results and analysis show that the thickness of infiltration media exerts a significant influence on the CODCr, NH3-N and TN concentration and removal efficiency of the effluent; the CODCr, NH3-N and TN are mainly removed in the 0-1800mm zone of the artificial soil column; the total CODCr removal efficiency increases, as the thickness of infiltration media increases, but the CODCr removal efficiency in the 1800-2200mm zone is very low; the NH3-N and TN removal efficiency reaches the maximum where the thickness of infiltration media is 1800mm; the NH3-N and TN concentration of the effluent from 1800-2200mm zone dose not decrease, but increase 5-8%, due to the assimilation denitrification and amemoniation reaction on the end of the anaerobic zone; in consideration of the effluent quality, efficient biodegradation zone, construction investment, etc. the optimal thickness of infiltration media in CRI system should be 1800mm.

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