scholarly journals Simultaneous Removal of Nitrogen and Refractory Organics from a Biologically Treated Leachate by Pulse Electrochemical Oxidation in a Multi-channel Flow Reactor

ACS Omega ◽  
2021 ◽  
Author(s):  
Zhanghao Jiang ◽  
Zhiliang Cheng ◽  
Chaoqun Yan ◽  
Xuan Zhang ◽  
Yijuan Tian ◽  
...  
Keyword(s):  
Electrochemical Oxidation ◽  
Channel Flow ◽  
Flow Reactor ◽  
Simultaneous Removal ◽  
Refractory Organics

Electrochemical oxidation of ethylene glycol in a channel flow reactor

2018 ◽  
Vol 309 ◽  
pp. 126-132 ◽  
Author(s):  
N.L. Chauhan ◽  
V. Dameera ◽  
A. Chowdhury ◽  
V.A. Juvekar ◽  
A. Sarkar
Keyword(s):  
Ethylene Glycol ◽  
Electrochemical Oxidation ◽  
Channel Flow ◽  
Flow Reactor

Simultaneous removal of fluoride and arsenic from groundwater by electrocoagulation using a filter-press flow reactor with a three-cell stack

2019 ◽  
Vol 208 ◽  
pp. 208-216 ◽  
Author(s):  
Miguel A. Sandoval ◽  
Rosalba Fuentes ◽  
José L. Nava ◽  
Oscar Coreño ◽  
Yanmei Li ◽  
...  
Keyword(s):  
Flow Reactor ◽  
Filter Press ◽  
Simultaneous Removal

Electrochemical oxidation of landfill leachate in a flow reactor: optimization using response surface methodology

2014 ◽  
Vol 22 (8) ◽  
pp. 5831-5841 ◽  
Author(s):  
Jefferson E. Silveira ◽  
Juan A. Zazo ◽  
Gema Pliego ◽  
Edério D. Bidóia ◽  
Peterson B. Moraes
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Electrochemical Oxidation ◽  
Landfill Leachate ◽  
Flow Reactor ◽  
Reactor Optimization

scholarly journals Photosensitised heterogeneous oxidation kinetics of biomass burning aerosol surrogates by ozone using an irradiated rectangular channel flow reactor

2013 ◽  
Vol 13 (3) ◽  
pp. 7553-7598
Author(s):  
S. M. Forrester ◽  
D. A. Knopf
Keyword(s):  
Channel Flow ◽  
Biomass Burning ◽  
Ozone Concentration ◽  
Flow Reactor ◽  
Rectangular Channel ◽  
Radiative Properties ◽  
Photon Flux ◽  
Biomass Burning Aerosol ◽  
Visible Irradiation ◽  
Uptake Data

Abstract. Heterogeneous reaction kinetics involving organic aerosol and atmospheric oxidants such as ozone can be enhanced under visible or UV irradiation in the presence of a photosensitiser, with subsequent implications for the climate, cloud radiative properties, air quality, and source appointment. In this study we report the steady state reactive uptake coefficient, γ, of O3 by levoglucosan and 5-nitroguaiacol acting as surrogates for biomass burning aerosol particles, with and without the presence of Pahokee peat acting as a photosensitiser. The reactive uptake has been determined in the dark and as a function of visible and UV-A irradiation and ozone concentration. In addition, γ was determined for 1:1, 1:10, and 1:100 by mass mixtures of Pahokee peat and 5-nitroguaiacol, and for a 10:1:3 mixture of levoglucosan, Pahokee peat, and 5-nitroguaiacol. We developed a novel irradiated rectangular channel flow reactor (I-RCFR) that was operated under low pressures of about 2–4 hPa, and allowed for uniform irradiation of the organic substrates. The I-RCFR was coupled to a chemical ionisation mass spectrometer and has been successfully validated by measuring the kinetics between various organic species and oxidants. γ of O3 and levoglucosan in the dark and under visible and UV-A irradiation was determined to be in the range of (2–11) × 10−6 and did not change in the presence of Pahokee peat. The determined γ of O3 and 5-nitroguaiacol in the dark was 5.7 × 10−6 and was only enhanced under UV-A irradiation, yielding a value of 3.6 × 10−5. γ of the 1:1 Pahokee peat/5-nitroguaiacol substrate was enhanced under visible and UV-A irradiation to 2.4 × 10−5 and 2.8 × 10−5, respectively. Decreasing the amount of Pahokee peat in the 5-nitroguaiacol/Pahokee peat substrate resulted in lower values of γ under visible irradiation, however, γ was consistent under UV-A irradiation regardless of the amount of Pahokee peat. The 10:1:3 mixture by mass of levoglucosan, Pahokee peat, and 5-nitroguaiacol, under both visible and UV-A irradiation yielded γ values of 2.8 × 10−5 and 1.4 × 10−5, respectively. γ was determined as a function of photon flux for O3 with the 1:1 Pahokee peat/5-nitroguaiacol substrate, yielding a linear relationship under both visible and UV-A irradiation. γ of O3 with the 1:1 Pahokee peat/5-nitroguaiacol substrate was determined as a function of ozone concentration and exhibited an inverse dependence of γ on ozone concentration, commonly interpreted as a Langmuir-Hinshelwood mechanism. The reactive uptake data have been represented by a Langmuir-type isotherm. From the O3 uptake data under visible irradiation, the following fit parameters have been derived: ks = (5.5 ± 2.7) × 10−19 cm2 s−1 molecule−1 and KO3 = (2.3 ± 2.0) × 10−12 cm3 molecule−1 and under UV-A irradiation: ks = (8.1 ± 2.0) × 10−19 cm2 s−1 molecule−1 and KO3 = (1.7 ± 0.7) × 10−12 cm3 molecule−1. The oxidative power, or the product of γ and [O3], was determined for O3 with the 1:1 Pahokee peat/5-nitroguaiacol substrate and was in the range of (1.2–26) × 106 molecule cm−3. Atmospheric particle lifetimes were estimated for a 0.4 μm 5-nitroguaiacol particle as a function of visible and UV-A irradiation and ozone concentration.

Colloidal sulphur production by electrochemical oxidation of sulphide in a swirling flow reactor

2021 ◽  
Author(s):  
Camila C. Contigiani ◽  
Juan P. Fornés ◽  
Omar González Pérez ◽  
J. M. Bisang
Keyword(s):  
Electrochemical Oxidation ◽  
Flow Reactor ◽  
Swirling Flow ◽  
Alkaline Solutions ◽  
Sulphide Ions ◽  
Cylindrical Reactor ◽  
Colloidal Sulphur

A cylindrical reactor with swirling flow is tested for the production of colloidal sulphur via the oxidation of sulphide ions with a concentration of 2 g dm−3 in alkaline solutions...

scholarly journals Electrochemical Oxidation Using BDD Anodes Combined with Biological Aerated Filter for Biotreated Coking Wastewater Treatment

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
C. R. Wang ◽  
Z. F. Hou ◽  
M. R. Zhang ◽  
J. Qi ◽  
J. Wang
Keyword(s):  
Wastewater Treatment ◽  
Electrochemical Oxidation ◽  
Average Energy ◽  
Coking Wastewater ◽  
Biological Aerated Filter ◽  
Treatment Technology ◽  
N Removal ◽  
Aerated Filter ◽  
Refractory Organics ◽  
Bdd Anodes

Coking wastewater is characterized by poor biodegradability and high microorganism toxicity. Thus, it is difficult to meet Grade I of Integrated Wastewater Discharge Standard of China by biological treatment technology; specifically, COD cannot meet above standard due to containing refractory organics. A novel coupling reactor, electrochemical oxidation using BDD anodes and biological aerated filter (BAF), has been developed for carbon and nitrogen removal from biotreated coking wastewater, focusing on COD, BOD5,NH4+-N, andNO3--N removal on operation over 90 days with average effluent value of 91.3, 9.73, 0.62, and 13.34 mgL−1, respectively. Average value of BOD5/COD and BOD5/NO3--N was enhanced from 0.05 to 0.27 and from 0.45 to 1.21 by electrochemical oxidation, respectively, with average energy consumption of 67.9 kWh kg−1COD. In addition, the refractory organics also were evidently mineralized in the unit based on the data of the three-dimensional fluorescence spectra. Meanwhile, its effluent provided excellent substrate for biological denitrification in BAF. At hydraulic retention time (HRT) of 13.08 h, about 12 mgL−1  NO3--N was depleted through denitrification, and it mainly occurred at top of 0.25 m height of BAF. Therefore, it is feasible to apply the coupling reactor for biotreated coking wastewater treatment and achieve desirable effluent quality.

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