scholarly journals Application of advanced oxidation for the removal of micropollutants in secondary effluents

2012 ◽  
Vol 2 (2) ◽  
pp. 121-126 ◽  
Author(s):  
Renato F. Dantas ◽  
Veronica Dominguez ◽  
Angel Cruz ◽  
Carmen Sans ◽  
Santiago Esplugas
Keyword(s):  
Organic Matter ◽  
Hydroxyl Radicals ◽  
Removal Rate ◽  
Oxygen Demand ◽  
Advanced Oxidation ◽  
Deionized Water ◽  
Oh Radicals ◽  
System Efficiency ◽  
Secondary Effluents ◽  
H2o2 System

The aim of this work was to study the use of advanced oxidation technologies for micropollutant (atrazine, ATZ) removal in secondary effluents (SE). Experiments were carried out, for comparison purposes, in deionized water and in municipal SE. ATZ concentration, chemical oxygen demand (COD) and total organic carbon (TOC) were recorded along the reaction time and used to evaluate the system efficiency. Results demonstrate that the presence of effluent organic matter (EfOM) can reduce the effectiveness of the methods to remove ATZ due to the competition of EfOM components to react with OH radicals and/or molecular ozone. ATZ was more easily removed by hydroxyl radicals, however the presence of EfOM promoted higher inhibition of its removal by hydroxyl radicals than by ozone. The addition of Fe as catalyst in the UV/H2O2 system also increased the ATZ removal rate in SE. In addition, direct ATZ photolysis promoted by UV alone must be considered in the assessment of its degradation by UV-based methods.

scholarly journals Scaling up Microbial Fuel Cells for Treating Swine Wastewater

Water ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1803 ◽  
Author(s):  
Yuko Goto ◽  
Naoko Yoshida
Keyword(s):  
Organic Matter ◽  
Fuel Cells ◽  
Microbial Fuel Cells ◽  
Removal Rate ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Swine Wastewater ◽  
Flow Mode ◽  
Carbon Cloth ◽  
Simultaneous Generation

Conventional aerobic treatment of swine wastewater, which generally contains 4500–8200 mg L−1 of organic matter, is energy-consuming. The aim of this study was to assess the application of scaled-up microbial fuel cells (MFCs) with different capacities (i.e., 1.5 L, 12 L, and 100 L) for removing organic matter from swine wastewater. The MFCs were single-chambered, consisting of an anode of microbially reduced graphene oxide (rGO) and an air-cathode of platinum-coated carbon cloth. The MFCs were polarized via an external resistance of 3–10 Ω for 40 days for the 1.5 L-MFC and 120 days for the 12L- and 100 L-MFC. The MFCs were operated in continuous flow mode (hydraulic retention time: 3–5 days). The 100 L-MFC achieved an average chemical oxygen demand (COD) removal efficiency of 52%, which corresponded to a COD removal rate of 530 mg L−1 d−1. Moreover, the 100 L-MFC showed an average and maximum electricity generation of 0.6 and 2.2 Wh m−3, respectively. Our findings suggest that MFCs can effectively be used for swine wastewater treatment coupled with the simultaneous generation of electricity.

The Research with Advanced Oxidation Technology to Degrade Organic Matter in Micro-Polluted Water

2011 ◽  
Vol 219-220 ◽  
pp. 804-808
Author(s):  
Xia Zhao ◽  
He Ming Luo ◽  
Hui Xia Feng ◽  
Jian Qiang Zhang
Keyword(s):  
Organic Matter ◽  
Potassium Permanganate ◽  
Removal Rate ◽  
Water Environment ◽  
Pollution Index ◽  
Advanced Oxidation ◽  
Polluted Water ◽  
Advanced Oxidation Technology ◽  
Oxidation Technology

Potassium permanganate process is an advanced oxidation technique that can provide a resolution removing organic matter in contaminated water. In this paper, the combination of composite potassium permanganate and a certain coagulant used in this process, which it was particularly suited to rapidly oxidize and degrade pollutants. It was an effective enhanced coagulation, advanced oxidation technique that could be conducted in a normal micro-polluted water environment. A series of experiment results demonstrated that the best adding quantity of composite potassium permanganate was 1.5-3.0mg/l, the best adding quantity of PFS as the coagulant was 25mg/l. Under the above conditions, potassium permanganate oxidation obviously reduced to each pollution index and greatly improved the water quality of purification of micro-polluted water. Furthermore, the organic removal rate with composite potassium permanganate was more than the unitary potassium permanganate process and the current traditional process.

Fenton oxidation of gallic and p-coumaric acids in water assisted by an activated carbon cloth

2015 ◽  
Vol 71 (5) ◽  
pp. 789-794 ◽  
Author(s):  
María A. Fontecha-Cámara ◽  
Miguel A. Álvarez ◽  
Victoria López-Ramón ◽  
Carlos Moreno-Castilla
Keyword(s):  
Activated Carbon ◽  
Hydroxyl Radicals ◽  
Degradation Products ◽  
Fenton Oxidation ◽  
Carbon Surface ◽  
Oh Radicals ◽  
Carbon Cloth ◽  
Coumaric Acid ◽  
Activated Carbon Cloth ◽  
H2o2 System

The objective of this study was to investigate the effect of the presence of an activated carbon cloth (ACC) during the degradation and removal of gallic acid (GA) and p-coumaric acid (pCA) by Fenton oxidation using H2O2 and FeSO4 as catalyst. Removal of GA or pCA by Fenton oxidation was much higher than that of total organic carbon (TOC), indicating that a large proportion of GA or pCA degradation products was not mineralized. The presence of ACC increased the concentration of hydroxyl radicals generated in the FeSO4 + H2O2 system. The presence of ACC during Fenton oxidation largely increased TOC and GA removal, attributable to the adsorption of GA and its degradation products and the increased generation of OH• radicals that mineralize them. In the Fenton oxidation of pCA, the presence of ACC produced the same effects as for GA, but now the increased removal of pCA was due to adsorption on the activated carbon and not to the increased generation of hydroxyl radicals, due to the greater affinity of pCA for the carbon surface and its more difficult mineralization in comparison to GA.

scholarly journals Experimental Study on a Closed-Cycle Humidification and Dehumidification System for Treating Wastewater Containing High Concentrations of Inorganic Salts and Organic Matter

Processes ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 671
Author(s):  
Jun Liu ◽  
Yong Sun ◽  
Sanjiang Yv ◽  
Jiaquan Wang ◽  
Kaixuan Hu
Keyword(s):  
Organic Matter ◽  
Industrial Wastewater ◽  
Removal Rate ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Filter Press ◽  
Inorganic Salts ◽  
Closed Cycle ◽  
Treatment Performance ◽  
High Concentrations

Industrial wastewater contains high concentrations of inorganic salts and organic matter. This experiment studied a system for treating wastewater containing high concentrations of inorganic salts and organic matter. The setup consists of a closed-cycle humidification and dehumidification system and a filter press. Chemical wastewater was used as the treatment solution, and the treatment performance of the system was tested and analyzed. The system effectively reduced the chemical oxygen demand (COD), electric conductivity (EC), total nitrogen (TN), and ammonia nitrogen (NH4-N) in the wastewater and, at the same time, dehydrated sludge was obtained through a filter press. The system maintains a stable removal rate of each index (COD, EC, TN, and NH4-N) in wastewater and can remove inorganic salts and organic matter from wastewater. The system can successfully treat industrial wastewater containing high concentrations of inorganic salts and organic matter.

An Overview of Treatment of Antibiotics Using Advanced Oxidation Process

2019 ◽  
pp. 226-260
Author(s):  
Rajesh Nithyanandam Rajasekaran ◽  
Hastheesudabye Puddoo ◽  
Thaothy Nithyanandam Nguyenhuynh
Keyword(s):  
Hydroxyl Radicals ◽  
Advanced Oxidation Process ◽  
Advanced Oxidation ◽  
Manufacturing Processes ◽  
Oh Radicals ◽  
Treated Water ◽  
Oxidation Processes ◽  
New Antibiotics ◽  
High Level ◽  
Complete Mineralization

Antibiotics present in the environment are originated from pharmaceutical manufacturing processes or through wastes such as urine and feces. As antibiotics remain recalcitrant and persist in the treated water, consumption of treated water containing antibiotics raises a concern in the development of antibiotic resistance bacteria which would be later released to the environment. It might result in a vicious cycle which new antibiotics needs to be developed and dosage has to increase. Advanced oxidation processes (AOP) have been studied to effectively degrade antibiotics. During this process, hydroxyl radicals are formed to degrade organic compounds. Different APO are available in the literature such as photo-Fenton, Fenton, ozonation, sonolysis (UV), ultrasound combined with ozone, TiO2/direct photolysis, UV/H2O2, UV/ TiO2, UV/IGBT. To treat the high level of concentration of antibiotics, retention time of AOPs needs to be extended or/and OH• radicals need to be produced in a higher concentration for a complete mineralization.

Effect of earthworm loads on organic matter and nutrient removal efficiencies in synthetic domestic wastewater, and on bacterial community structure and diversity in vermifiltration

2013 ◽  
Vol 68 (1) ◽  
pp. 43-49 ◽  
Author(s):  
L. M. Wang ◽  
X. Z. Luo ◽  
Y. M. Zhang ◽  
J. J. Lian ◽  
Y. X. Gao ◽  
...  
Keyword(s):  
Organic Matter ◽  
Community Structure ◽  
Bacterial Community ◽  
Bacterial Community Structure ◽  
Removal Rate ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Ammonia Nitrogen ◽  
Domestic Sewage ◽  
Shannon Index

In this paper, we studied the effect of earthworm loads on the removal rates of chemical oxygen demand (COD), ammonia nitrogen (NH3-N), total nitrogen, and total phosphorus from synthetic domestic sewage and on the bacterial community structure and diversity of substrates in earthworm packing beds. The different vermifiltrations (VFs), including the control, are successful in removing both organic matter (OM) and nutrients. The removal rate of NH3-N at 12.5 g of earthworm/L of soil VF is higher compared with that at 0 and 4.5 earthworm load VFs. The highest Shannon index, in the earthworm packing bed, occurred at 16.5 earthworm load VF. Furthermore, the COD removal rate is significantly correlated with the Shannon index, which reveals that OM removal for synthetic domestic sewage treatment at VF might be more dependent on bacterial diversity at the earthworm packing bed. The band distributions and diversities of the bacterial community for samples from different earthworm loads in VFs suggest that the bacterial community structure was only affected within the earthworm packing bed when the earthworm load reached a certain level. The present study adds to the current understanding of OM and nutrient degradation processes in VF domestic wastewater treatment.

Effect of Hydrogen Peroxide on Oxidation of Copper in CMP Slurries Containing Glycine and Cu Sulfate

2004 ◽  
Vol 816 ◽  
Author(s):  
Tianbao Du ◽  
Arun Vijayakumar ◽  
Vimal Desai
Keyword(s):  
Hydrogen Peroxide ◽  
Hydroxyl Radicals ◽  
Copper Sulfate ◽  
Photoelectron Spectroscopy ◽  
Removal Rate ◽  
Oh Radicals ◽  
Electrochemical Investigation ◽  
X Ray ◽  
Enhanced Dissolution ◽  
Maximum Removal

AbstractThis study compares the oxidative dissolution, passivation, and polishing behavior of copper chemical mechanical polishing in the presence of hydrogen peroxide, glycine and copper sulfate. High purity discs were used to study the dissolution and oxidation kinetics under static and dynamic conditions at pH 4 with varying H2O2 concentrations. Changes in surface chemistry of the statically etched copper-disc were investigated using X-ray photoelectron spectroscopy (XPS). With the addition of glycine and copper sulfate to the slurry, the copper removal rates increased significantly and the maximum removal rate shifted to a H2O2 concentration of 3%. Electrochemical investigation indicates an enhanced dissolution of copper, which might be due to the strong catalytic activity of Cu(II)-glycine complexes in decomposing H2O2 to yield hydroxyl radicals. XPS results suggest that the passivation at higher H2O2 concentrations in the presence of glycine and copper sulfate is provided by the OH radicals adsorbed on Cu surface.

scholarly journals Use of combined UASB + eMBR treatment for removal of emerging micropollutants and reduction of fouling

2021 ◽  
Author(s):  
Karen Mora-Cabrera ◽  
Carlos Peña-Guzmán ◽  
Arturo Trapote ◽  
Daniel Prats
Keyword(s):  
Organic Matter ◽  
Statistical Analysis ◽  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Removal Rate ◽  
Substantial Reduction ◽  
Oxygen Demand ◽  
Domestic Water ◽  
Anaerobic Reactor ◽  
Micro Pollutants

Abstract This study employs a novel combined pilot plant consisting of an anaerobic reactor followed by a membrane electro-bioreactor (eMBR) to treat domestic water containing selected micro-pollutants of emerging concern (CECs) [ibuprofen (IB), carbamazepine, diclofenac (DCF) and 17α-ethinylestradiol (EE2)]. The first phase operated as a conventional membrane bioreactor to achieve the removal of organic matter [chemical oxygen demand (COD)], the CECs and phosphorus. A removal rate of 96.3% for COD, 94.5% for IB, 37.1% for CMZ, 87.1% for DCF and 96% for EE2 was obtained. In the three subsequent phases, current density (CD) of 5, 10 and 15 A/m2 was applied successively in the eMBR with the aim of investigating the effects on the removal of the former components and the fouling of the membrane. After the application of 5 and 10 A/m2 CD, the removal rate of COD decreased. Regarding phosphorus, a CD of 5 A/m2 was enough to achieve the rate of 97% and the membrane fouling suffered a substantial reduction too. Finally, the experimental results were subject to statistical analysis using the Kruskal–Wallis and Wilcoxon tests to validate the influence of each DC.

The performance of a sulfate-radical mediated advanced oxidation process in the degradation of organic matter from secondary effluents

2018 ◽  
Vol 4 (6) ◽  
pp. 773-782 ◽  
Author(s):  
Dayang Wang ◽  
Lirong Cheng ◽  
Mingming Wang ◽  
Xuezhen Zhang ◽  
Dong Xue ◽  
...  
Keyword(s):  
Organic Matter ◽  
Transition Metal ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Sulfate Radical ◽  
Oxidation Processes ◽  
Secondary Effluents ◽  
Energy Activation

The effects of sulfate radical-mediated advanced oxidation processes with transition metal and energy activation methods were investigated during effluent organic matter (EfOM) degradation.

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