Treatment of pharmaceutical wastewater by combination of electrocoagulation, electro-fenton and photocatalytic oxidation processes

2020 ◽  
Vol 8 (3) ◽  
pp. 103777 ◽  
Author(s):  
Gizem Başaran Dindaş ◽  
Yasemin Çalışkan ◽  
Emin Ender Çelebi ◽  
Mesut Tekbaş ◽  
Nihal Bektaş ◽  
...  
Keyword(s):  
Photocatalytic Oxidation ◽  
Pharmaceutical Wastewater ◽  
Oxidation Processes

scholarly journals Magnetic iron oxide/clay nanocomposites for adsorption and catalytic oxidation in water treatment applications

2020 ◽  
Vol 18 (1) ◽  
pp. 1148-1166
Author(s):  
Ganjar Fadillah ◽  
Septian Perwira Yudha ◽  
Suresh Sagadevan ◽  
Is Fatimah ◽  
Oki Muraza
Keyword(s):  
Iron Oxide ◽  
Water Treatment ◽  
Photocatalytic Oxidation ◽  
Low Cost ◽  
Synthesis Method ◽  
Chemical Oxidation ◽  
Magnetic Iron Oxide ◽  
Oxidation Processes ◽  
Recent Developments ◽  
Physical And Chemical

AbstractPhysical and chemical methods have been developed for water and wastewater treatments. Adsorption is an attractive method due to its simplicity and low cost, and it has been widely employed in industrial treatment. In advanced schemes, chemical oxidation and photocatalytic oxidation have been recognized as effective methods for wastewater-containing organic compounds. The use of magnetic iron oxide in these methods has received much attention. Magnetic iron oxide nanocomposite adsorbents have been recognized as favorable materials due to their stability, high adsorption capacities, and recoverability, compared to conventional sorbents. Magnetic iron oxide nanocomposites have also been reported to be effective in photocatalytic and chemical oxidation processes. The current review has presented recent developments in techniques using magnetic iron oxide nanocomposites for water treatment applications. The review highlights the synthesis method and compares modifications for adsorbent, photocatalytic oxidation, and chemical oxidation processes. Future prospects for the use of nanocomposites have been presented.

scholarly journals Heterogeneous Photo-Fenton Catalytic Degradation of Practical Pharmaceutical Wastewater by Modified Attapulgite Supported Multi-Metal Oxides

Water ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 156
Author(s):  
Manjing Lu ◽  
Jiaqi Wang ◽  
Yuzhong Wang ◽  
Zhengguang He
Keyword(s):  
Photocatalytic Oxidation ◽  
Removal Rate ◽  
Catalytic Degradation ◽  
Gas Chromatography Mass Spectrometry ◽  
Pharmaceutical Wastewater ◽  
High Concentration ◽  
Modified Attapulgite ◽  
Cod Removal Rate ◽  
Pre Treatment ◽  
Almost All

Chemical synthetic pharmaceutical wastewater has characteristics of high concentration, high toxicity and poor biodegradability, so it is difficult to directly biodegrade. We used acid modified attapulgite (ATP) supported Fe-Mn-Cu polymetallic oxide as catalyst for multi-phase Fenton-like ultraviolet photocatalytic oxidation (photo-Fenton) treatment with actual chemical synthetic pharmaceutical wastewater as the treatment object. The results showed that at the initial pH of 2.0, light distance of 20 cm, and catalyst dosage and hydrogen peroxide concentration of 10.0 g/L and 0.5 mol/L respectively, the COD removal rate of wastewater reached 65% and BOD5/COD increased to 0.387 when the reaction lasted for 180 min. The results of gas chromatography-mass spectrometry (GC-MS) indicated that Fenton-like reaction with Fe-Mn-Cu@ATP had good catalytic potential and significant synergistic effect, and could remove almost all heterocycle compounds well. 3D-EEM (3D electron microscope) fluorescence spectra showed that the fluorescence intensity decreased significantly during catalytic degradation, and the UV humus-like and fulvic acid were effectively removed. The degradation efficiency of the nanocomposite only decreased by 5.8% after repeated use for 6 cycles. It seems appropriate to use this process as a pre-treatment for actual pharmaceutical wastewater to facilitate further biological treatment.

Coupling membrane separation and photocatalytic oxidation processes for the degradation of pharmaceutical pollutants

2013 ◽  
Vol 47 (15) ◽  
pp. 5647-5658 ◽  
Author(s):  
F. Martínez ◽  
M.J. López-Muñoz ◽  
J. Aguado ◽  
J.A. Melero ◽  
J. Arsuaga ◽  
...  
Keyword(s):  
Photocatalytic Oxidation ◽  
Membrane Separation ◽  
Oxidation Processes ◽  
Pharmaceutical Pollutants

Location of photocatalytic oxidation processes on anatase titanium dioxide

2017 ◽  
Vol 7 (2) ◽  
pp. 441-451 ◽  
Author(s):  
Xuan Hao Lin ◽  
Yijia Miao ◽  
Sam Fong Yau Li
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Oxidation ◽  
Detailed Mechanism ◽  
Oxidation Processes ◽  
Degradation Processes

The detailed mechanism of photocatalytic oxidation processes on the TiO2 surface is still not completely clear, particularly the location of degradation processes.

scholarly journals Removal of Flotation Collector O-Isopropyl-N-ethylthionocarbamate from Wastewater

Molecules ◽  
2021 ◽  
Vol 26 (21) ◽  
pp. 6676
Author(s):  
Zhe Wang ◽  
Jun Yao ◽  
Mojca Bavcon Kralj ◽  
Darko Dolenc ◽  
Polonca Trebše
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Compound ◽  
Photocatalytic Oxidation ◽  
Solar Irradiation ◽  
Sulfide Ores ◽  
Reaction Intermediates ◽  
Oxidation Processes ◽  
Iron Salts ◽  
Artificial Uv ◽  
Flotation Collector

Flotation collector O-isopropyl N-ethylthionocarbamate (IPETC) is widely used for separation of sulfide ores. Its removal from water by several oxidation processes was studied. Photocatalytic oxidation with air in the presence of iron salts, utilizing solar irradiation or artificial UV-A light is very efficient. Oxidation leads through the formation of O-isopropyl N-ethylcarbamate and several other reaction intermediates to total decomposition of organic compound in the final stage in 1 day. Similar results were obtained with a Fenton type oxidation with hydrogen peroxide and iron salts. Treatment with sodium hypochlorite yields mainly O-isopropyl N-ethylcarbamate. The formation of this compound in wastewaters can be of concern, since simple alkyl carbamates are cancer suspect agents.

scholarly journals Removal of Emerging Contaminants in Wastewater by Sonolysis, Photocatalysis and Ozonation

2018 ◽  
Vol 21 (2) ◽  
pp. 98-105 ◽  
Keyword(s):  
Rate Constants ◽  
Photocatalytic Oxidation ◽  
Advanced Oxidation Processes ◽  
Emerging Contaminants ◽  
Removal Rate ◽  
Experimental Conditions ◽  
Oxidation Processes ◽  
First Order ◽  
Performance Variation ◽  
Pseudo First Order

<p>Three different advanced oxidation processes (AOPs) were applied to investigate the removal of emerging contaminants (ECs) i.e. sulfamethoxazole (SMX), diclofenac (DCF) and carbamazepine (CBZ) in synthetically prepared solutions. The degradation of these substances was carried out by ozonation, sonolysis and photocatalytic oxidation, as well as by different combinations of these processes. The objectives of this work were to evaluate the removal efficiency in each AOP and to assess the performance variation of sonolysis in combination with other AOPs. The best performances were achieved by sonocatalysis, which resulted in the removal of the selected pharmaceuticals in the range between 37% and 47%. Under similar experimental conditions, the removal of the selected ECs by single compounds by ozonation was slightly lower than the removal of respective compounds in the mixture. Moreover, pseudo first-order removal rate constants of photocatalytic mineralization were determined as 9.33×10-2, 4.90×10-3, 1.06×10-2 min-1 for SMX, DCF and CBZ, respectively.</p>

Degradation of PVA (polyvinyl alcohol) in wastewater by advanced oxidation processes

2017 ◽  
Vol 20 (2) ◽  
Author(s):  
Weihua Sun ◽  
Lujun Chen ◽  
Jianlong Wang
Keyword(s):  
Polyvinyl Alcohol ◽  
Photocatalytic Oxidation ◽  
Advanced Oxidation Processes ◽  
Organic Pollutant ◽  
Advanced Oxidation ◽  
Air Oxidation ◽  
Paper Mills ◽  
Persulfate Oxidation ◽  
Oxidation Processes ◽  
Biological Methods

AbstractAdvanced oxidation processes (AOPs) constitute a promising technology to treat wastewater containing organic pollutants that are not easily biodegradable. They have received increasing attention in the research and development of wastewater treatment technologies in recent decades for their removal or degradation of recalcitrant pollutants or as pretreatments to convert pollutants into smaller compounds, which can be treated using conventional biological methods. Polyvinyl alcohol (PVA) is a typical refractory organic pollutant. It has received special attention due to its low biodegradability and the large amount of PVA-containing wastewater discharged from textile and paper mills. This review focuses on PVA removal and PVA wastewater pretreatment by AOPs, which include ozonation, Fenton oxidation, persulfate oxidation, ultrasound cavitation, ionizing radiation, photocatalytic oxidation, wet air oxidation and electrochemical oxidation. The mechanistic degradation pathways of PVA by AOPs are also discussed. In addition, a new classification of AOPs is applied for PVA treatment.

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