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.

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.

Wet oxidation of an industrial high concentration pharmaceutical wastewater using hydrogen peroxide as an oxidant

2017 ◽  
Vol 20 (1) ◽  
Author(s):  
Xu Zeng ◽  
Jun Liu ◽  
Jianfu Zhao
Keyword(s):  
Hydrogen Peroxide ◽  
Removal Rate ◽  
Batch Reactor ◽  
Cod Removal ◽  
Evaluation Index ◽  
Wet Oxidation ◽  
Pharmaceutical Wastewater ◽  
High Concentration ◽  
Cod Removal Rate ◽  
Temperature Time

AbstractWet oxidation of an industrial pharmaceutical wastewater with high concentration organic pollutants using hydrogen peroxide as an oxidant was investigated. Experiments were performed in a batch reactor to discuss the effects of reaction temperature, time, the hydrogen peroxide amount and catalyst with COD removal rate as an evaluation index. Results show that the highest COD removal rate, 81.6 %, was achieved at 240 ºC for 60 min with the addition of H

Aerobic granulation in a sequencing batch reactor (SBR) for industrial wastewater treatment

2005 ◽  
Vol 52 (10-11) ◽  
pp. 335-343 ◽  
Author(s):  
M. Inizan ◽  
A. Freval ◽  
J. Cigana ◽  
J. Meinhold
Keyword(s):  
Industrial Wastewater ◽  
Removal Rate ◽  
Batch Reactor ◽  
Experimental Tests ◽  
Cod Removal ◽  
High Concentration ◽  
Granule Formation ◽  
Aerobic Granulation ◽  
Cod Removal Rate ◽  
Set Up

Aerobic granulation seems to be an a attractive process for COD removal from industrial wastewater, characterised by a high content of soluble organic compounds. In order to evaluate the practical aspects of the process, comparative experimental tests are performed on synthetic and on industrial wastewater, originating from pharmaceutical industry. Two pilot plants are operated as sequencing batch bubble columns. Focus was put on the feasibility of the process for high COD removal and on its operational procedure. For both wastewaters, a rapid formation of aerobic granules is observed along with a high COD removal rate. Granule characteristics are quite similar with respect to the two types of wastewater. It seems that filamentous bacteria are part of the granule structure and that phosphorus precipitation can play an important role in granule formation. For both wastewaters similar removal performances for dissolved biodegradable COD are observed (> 95%). However, a relatively high concentration of suspended solids in the outlet deteriorates the performance with regard to total COD removal. Biomass detachment seems to play a non-negligible role in the current set-up. After a stable operational phase the variation of the pharmaceutical wastewater caused a destabilisation and loss of the granules, despite the control for balanced nutrient supply. The first results with real industrial wastewater demonstrate the feasibility of this innovative process. However, special attention has to be paid to the critical aspects such as granule stability as well as the economic competitiveness, which both will need further investigation and evaluation.

Research on Coal Chemical Wastewater Treatment by Nano-TiO2 Powder Photocatalytic Oxidation Process

2012 ◽  
Vol 550-553 ◽  
pp. 2232-2236 ◽  
Author(s):  
Pei Yao Xu ◽  
Xiu Jie Chu ◽  
Yan Qing Li ◽  
Fan Zhang
Keyword(s):  
Photocatalytic Oxidation ◽  
Removal Rate ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Cod Removal ◽  
Illumination Time ◽  
Photocatalytic Effect ◽  
Uv Lamp ◽  
Cod Removal Rate ◽  
Raw Wastewater

Abstract. With TiO2 as photocatalyst, hydrogen peroxide(H2O2) as oxidant, treated the coal chemical wastewater under the condition of 30W UV lamp irradiation. Discussed the effects of those factors—pH, dosage of TiO2 powder, dosage of FeCl3, dosage of H2O2 and illumination time etc. on Chemical Oxygen Demand(COD) removal rate of wastewater. The results have shown that: when taking the pH of raw water, TiO2 0.2g per 100ml wastewater, FeCl3 0.01g per 100ml wastewater, H2O2 1.2 ml per 100ml wastewater, 5h illumination time, quiet place 3h, acquired the best photocatalytic effect. After treated under the optimum technological conditions, the COD removal rate reached 70.09%; the removal rate of Biological Oxygen Demand(BOD5), ammonia nitrogen, cyanide and color reached respectively to 58.60%、39.99%, 72.41% and 90%. After repeated 10 times, all the active of TiO2 was almost lost. With the regeneration treatment by high-temperature cauterization, the regenerated catalyst was added into the raw wastewater. Then under the optimum technological conditions, after illuminated 7h, the COD removal rate of wastewater recovered to 49.47%.

Photocatalytic Oxidation Degradation Behavior on Fracturing Wastewater in Oilfield

2011 ◽  
Vol 396-398 ◽  
pp. 1918-1922 ◽  
Author(s):  
Li Ping Wan ◽  
Ying Feng Meng ◽  
Gao Li ◽  
Hua Zhou
Keyword(s):  
Photocatalytic Oxidation ◽  
Ph Value ◽  
Removal Rate ◽  
Oil Field ◽  
Cod Removal ◽  
Composite Catalyst ◽  
Application Time ◽  
Secondary Pollution ◽  
Cod Removal Rate ◽  
Temperature Activation

Due to great variety additives and disposal difficulty, chemical method, biochemical method and solidification are adopted to treat fracturing wastewater in oil field. These processes easily bring about shortcomings, including high cost and secondary pollution. Studied on the treatment of fracturing wastewater of 4# well in Sichuan Oilfield by modified bentonite loading TiO2-Ag2O composite catalyst, COD removal rate is determined for different condition of pH value of solution, adding content of TiO2, inflating volume and light application time. The optimal condition is obtained as follows: pH value of solution is 3, adding content of TiO2 is 0.4-0.5%, inflating volume is 15L/min and light application time is 3h. Under this condition, COD removal rate of fracturing wastewater is 58.1%. The composite catalyst performance is stable and without secondary pollution. It is reusable by high temperature activation, so it can reduce wastewater treatment cost, and should be widely applied.

The Photocatalytic Oxidation Properties of La3+-Doped and Ce4+-Doped ZnO-TiO2 in Treating Pharmaceutical Wastewater

2013 ◽  
Vol 726-731 ◽  
pp. 2988-2992
Author(s):  
Lei Zhu ◽  
Yang Fan Xiao ◽  
Xun Wang
Keyword(s):  
Photocatalytic Oxidation ◽  
Removal Rate ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Pharmaceutical Wastewater ◽  
X Ray ◽  
Chinese Patent Medicine ◽  
Chinese Patent ◽  
Oxidation Properties ◽  
Doping Ratio

This experiment aims to prepare the Zn2 +-doped TiO2 composite semiconductor materials by the sol-gel method and to characterize their crystal structures by X-ray diffraction and electron microscopy (SEM) scanning. The degradation target in this experiment is the pharmaceutical wastewater of a certain Chinese patent medicine, whose COD is as high as 300,000 mg/L and chroma is above 500 degrees. When the doping ratio of ZnO is 8%, the pharmaceutical wastewaters COD and chroma removal rates for 2hs degradation respectively reach 72.5% and 33.8%. The doping of Ce4+ or La3+ can improve the catalytic activity of ZnO-TiO2. The cerium doped in can improve ZnO-TiO2s catalytic property within 7%, and when the doping ratio of lanthanum is 0.4%, the chroma removal rate of the pharmaceutical wastewater reaches 65%, 31.2% more than that of the pure ZnO-TiO2.

scholarly journals Contrast Experiment on Advanced Treatment of Pharmaceutical and Paper-making Wastewater through Cinder Fenton-like Process

2018 ◽  
Vol 38 ◽  
pp. 01034
Author(s):  
Jia Xiaofeng ◽  
Chen Xiaoyu ◽  
Mai Wenning
Keyword(s):  
Removal Rate ◽  
Orthogonal Experiment ◽  
Optimal Combination ◽  
Utilization Rate ◽  
Advanced Treatment ◽  
Pharmaceutical Wastewater ◽  
Paper Making ◽  
Optimal Reaction Condition ◽  
Cod Removal Rate ◽  
Optimal Reaction

The Fenton-like process of catalyzing H2O2 with Fe2+ and cinder is adopted to subject pharmaceutical and paper-making wastewater to advanced treatment. The influence of each factor is determined using orthogonal experiment and single factor test. The optimal combination of influencing factors is 0.3mmol · L-1 of FeSO4 · 7H2O, [H2O2]:[Fe2+]=8:1 and 10g · L-1 of pyrites cinder. The reaction time in pharmaceutical wastewater and paper-making wastewater is 30min and 60min respectively, testifying to the fact that the reaction in pharmaceutical wastewater is faster than that in paper-making wastewater and the lower utilization rate of cinder in pharmaceutical wastewater. Under the optimal reaction condition, the COD removal rate of these two kinds of wastewater can reach as high as 65% and 72%. Characterized by simple operation and requiring less reagent dosage, this method does not have to regulate the pH of flooding water and allows the repeated usage of cinder.

The Experiment Research of BAF in Treatment on Pharmaceutical Wastewater

2013 ◽  
Vol 295-298 ◽  
pp. 1263-1266
Author(s):  
Peng Wang ◽  
Zeng Zhang Wang
Keyword(s):  
Low Temperature ◽  
Biofilm Formation ◽  
Removal Rate ◽  
Cod Removal ◽  
Pharmaceutical Wastewater ◽  
Experiment Research ◽  
N Removal ◽  
Cod Removal Rate

This research has discussed the biofilm formation on the treatment of pharmaceutical wastewater in BAF. The removal rate of COD and NH3-N and law of the performance on the temperature and height of fillers are studied here. The results show that the BAF can still maintain a higher COD removal rate in the 13°C-25°C, the average removal rate reaches 86.9%. The denitrification is impacted by low temperature that the average removal rate of 74.7%. Experiment shows that, from 0cm to 65cm part, the removal rate of COD reachs 86.3%. The good performance of NH3-N removal rate mainly concentrates in the height of 35cm ~ 95cm.

Study on the Industrial Wastewater Treatment by Modified Bentonite

2012 ◽  
Vol 182-183 ◽  
pp. 323-327 ◽  
Author(s):  
Hong Shao ◽  
Zhi Fang Zhang ◽  
Ning Cao
Keyword(s):  
Surface Area ◽  
Removal Rate ◽  
Mixing Time ◽  
Monosodium Glutamate ◽  
Basic Structure ◽  
Raw Material ◽  
Coking Wastewater ◽  
High Concentration ◽  
Modified Bentonite ◽  
Cod Removal Rate

The natural bentonite as raw material, chitosan as a modifier to prepare chitosan modified bentonite. The use of modified bentonite, each dealing with a high concentration of COD monosodium glutamate (MSG)wastewater and coking wastewater .The optimal conditions: mixing time : 10 ~ 12 min;centrifugation time :25 ~ 30min; PH: 8.5 ~ 9.5; dosage: 10~14g / L. The results showed that the treatment of modified bentonite is better than the bentonite and chitosan. The COD removal rate of MSG wastewater and coking wastewater were 60.1% and 82.3%. So the treatment of coking wastewater is efficiency.. By scanning electron microscopy, surface area and X-ray diffraction analysis shows that modification does not change the basic structure of the bentonite only increased the specific surface area of bentonite, and the adsorption capacity of pollutants.

Effect of MLSS on Nitrosation Denitrifying Phosphorus Removal System

2013 ◽  
Vol 777 ◽  
pp. 303-308 ◽  
Author(s):  
Li Cheng Zhang ◽  
Qiang Liu ◽  
Yu Lan ◽  
Yang Yu
Keyword(s):  
Carbon Source ◽  
Phosphorus Removal ◽  
Removal Rate ◽  
Phosphorus Release ◽  
Low Carbon ◽  
High Concentration ◽  
Nitrogen And Phosphorus ◽  
Denitrifying Phosphorus Removal ◽  
Phosphorus Absorption ◽  
Cod Removal Rate

The influence of MLSS on nitrosation denitrifying phosphorus removal (NDPR) process was investigated through the experiments of anaerobic-anoxic NDPR and anoxic NDPR. Experimental results show that the higher MLSS is, the bigger COD removal rate is, and the higher the rates of anaerobic phosphorus release and anoxic phosphorus absorption are. Low carbon sewage will easily lead to insufficient inner carbon source in the system with high MLSS. High concentration of carbon source in the raw water with high MLSS will bring considerable difficulties to returned sludge and sludge treatment. Moreover, excessive MLSS will result in phosphorus release in the later anoxic stage, and lower MLSS can prolong the time of denitrification and phosphorus removal. The system with 5200 mg/L MLSS has the best effect of nitrogen and phosphorus removal.

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