Case study on the bioeffluent of petrochemical wastewater by electro-fenton method

1999 ◽  
Vol 39 (10-11) ◽  
pp. 145-149 ◽  
Author(s):  
Yao-Hui Huang ◽  
Shanshan Chou ◽  
Ming-Ging Perng ◽  
Gaw-Hao Huang ◽  
Sheng-Shung Cheng
Keyword(s):  
Removal Efficiency ◽  
Sodium Hypochlorite ◽  
Operating Conditions ◽  
Cod Removal ◽  
The Other ◽  
Ferrous Ion ◽  
Screening Tests ◽  
Fenton Process ◽  
Petrochemical Wastewater

The electro-Fenton method, in which ferrous ion is produced at the anode and used as a catalyst of H2O2, was applied for treating the bioeffluent of petrochemical manufacturing wastewater. The major pollutant in the bioeffluent was identified as hexamine, which was nonbiodegradable and contributed 65% of COD. The goal of this study was to treat the biotreatment effluent with more than 50% of COD removal efficiency. Oxidants that involved ozone, ozone/H2O2, sodium hypochlorite, and Fenton's reagent were employed to treat this effluent by jar tests. However, none could meet the goal in the range of operating conditions used. On the other hand, more than 80% of COD was removed with the electro-Fenton process. These screening tests indicated that only the electro-Fenton process was compatible with the goal.

scholarly journals Study of the Effect of Activated Carbon Cathode Configuration on the Performance of a Membrane-Less Microbial Fuel Cell

Catalysts ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 619
Author(s):  
M. L. Jiménez González ◽  
Carlos Hernández Benítez ◽  
Zabdiel Abisai Juarez ◽  
Evelyn Zamudio Pérez ◽  
Víctor Ángel Ramírez Coutiño ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Removal Efficiency ◽  
Internal Resistance ◽  
Cod Removal ◽  
The Other ◽  
Cod Removal Efficiency ◽  
Water Recirculation ◽  
Better Than

In this paper, the effect of cathode configuration on the performance of a membrane-less microbial fuel cell (MFC) was evaluated using three different arrangements: an activated carbon bed exposed to air (MFCE), a wetland immersed in an activated carbon bed (MFCW) and a cathode connected to an aeration tower featuring a water recirculation device (MFCT). To evaluate the MFC performance, the efficiency of the organic matter removal, the generated voltage, the power density and the internal resistance of the systems were properly assessed. The experimental results showed that while the COD removal efficiency was in all cases over 60% (after 40 days), the MFCT arrangement showed the best performance since the average removal value was 82%, compared to close to 70% for MFCE and MFCW. Statistical analysis of the COD removal efficiency confirmed that the performance of MCFT is substantially better than that of MFCE and MFCW. In regard to the other parameters surveyed, no significant influence of the different cathode arrangements explored could be found.

Comparative investigations on COD-removal in sequencing batch reactors and continuous flow plants

2001 ◽  
Vol 43 (3) ◽  
pp. 45-52 ◽  
Author(s):  
T. Dockhorn ◽  
N. Dichtl ◽  
R. Kayser
Keyword(s):  
Removal Efficiency ◽  
Municipal Wastewater ◽  
Plug Flow ◽  
Main Idea ◽  
Operating Conditions ◽  
Cod Removal ◽  
Batch Reactors ◽  
Mixing Characteristics ◽  
Hydraulic Load ◽  
The Individual

Investigations on enhanced COD removal from municipal wastewater were performed over a period of 2.5 years, comparing three different types of reactor. The main idea was to determine the influence of the mixing characteristics of the reactor on the treatment processes and the effluent quality. Therefore three pilot plants (a completely mixed reactor, a cascade of three reactors and a SBR) were operated under equal conditions (wastewater, hydraulic load, temperature, sludge age) in parallel to each other. Investigations were carried out at different sludge ages. It could be shown that within one sludge age the CODf removal efficiency increased, when mixing characteristics came closer to the plug flow and it also increased with higher temperatures. A significant correlation was observed between the COD removal efficiency and the sludge load. The higher the sludge load was the greater the CODf concentration in the effluent. Especially the SBR reactor showed an excellent performance under the given operating conditions. Dynamic simulation calculations were carried out, to investigate whether the influence of the type of reactor on the COD-elimination could be described theoretically by combining growth kinetics and the mixing characteristics of the individual reactors. The results showed that performance was better when mixing characteristics came closer to plug flow.

The Pulse Electrolysis Treatment of Waste Emulsion Orthogonal Experimental Study

2013 ◽  
Vol 303-306 ◽  
pp. 2616-2619
Author(s):  
Xiao Yan Sun ◽  
Pei Dao Pan ◽  
Jang Jie Wang
Keyword(s):  
Experimental Study ◽  
Removal Efficiency ◽  
Current Density ◽  
Pulse Width ◽  
Ph Value ◽  
Operating Conditions ◽  
Cod Removal ◽  
Pulse Electrolysis ◽  
Cod Removal Efficiency ◽  
Plate Distance

This mechanical processing waste emulsion for the study, handled by pulse electrolysis. Arrangements by orthogonal testing, experimental study on plate distance (d), current density (i), the pH value and the pulse width (tP) impact on COD removal efficiency, very poor analysis of test data to determine various factors affecting the COD removal efficiency of primary and secondary sort: pH value > current density > pulse width > plate distance, optimal operating conditions. Orthogonal experimental data derived from regression analysis, determination of cross of quadratic polynomial regression equations, mathematical model. Tests confirmed that pulse electrochemical method for treatment of waste emulsion with low energy consumption, short response time, and other advantages, strong applicability of wastewater, building mathematical models, providing theoretical basis for subsequent design.

Phenol degradation in horizontal-flow anaerobic immobilized biomass (HAIB) reactor under mesophilic conditions

2001 ◽  
Vol 44 (4) ◽  
pp. 167-174 ◽  
Author(s):  
R. M.L. Bolaños ◽  
M. B.A. Varesche ◽  
M. Zaiat ◽  
E. Foresti
Keyword(s):  
Removal Efficiency ◽  
Phenol Degradation ◽  
Oxygen Demand ◽  
Operating Conditions ◽  
Cod Removal ◽  
Horizontal Flow ◽  
Anaerobic Sludge ◽  
Cod Removal Efficiency ◽  
Immobilized Biomass ◽  
Potential Use

A bench-scale horizontal-flow anaerobic immobilized biomass (HAIB) reactor was assayed aiming to verify its potential use for phenol degradation. The HAIB reactor consisted of a bore-silicate tube (100 cm long; 5.04 cm diameter) filled with polyurethane foam matrices containing immobilized anaerobic sludge. Before being subjected to phenol, the reactor was fed with synthetic substrate at the influent chemical oxygen demand (COD) of 1,028 mg.l−1 achieving 98% of COD removal efficiency. Thereafter, phenol as the sole carbon source was added under step-increasing concentrations from 50 to 1,200 mg.l−1. Phenol degradation was evaluated by gas chromatographic analysis of influent and effluent samples. Process monitoring included determinations of pH, volatile acids, alkalinity and COD. The HAIB reactor was operated at a constant hydraulic detention time (HDT) of 12 hours. After 33 days with 50 mg/l of phenol in the influent, the reactor achieved 98% of COD removal efficiency. Successful phenol degradation (efficiency removal of 99%) occurred for influent concentrations of 100, 300, 600, 900 and 1,200 mg.l−1 after 148, 58, 47, 29 and 7 days, respectively. The predominance of Methanosaeta-like, rods and methanogenic cocci could be observed in all the operating conditions, besides the presence of phenol oxidizing microorganisms as irregular rods. The results indicate that phenol degradation at very high rates can be accomplished in HAIB reactors containing acclimatized biomass.

scholarly journals An enhanced treatment efficiency for diluted palm oil mill effluent using a photo-electro-fenton hybrid system

2019 ◽  
Vol 84 (5) ◽  
pp. 517-526 ◽  
Author(s):  
Noralisya Ali ◽  
Chee Yeoh ◽  
Seng Lau ◽  
Meng Tay
Keyword(s):  
Removal Efficiency ◽  
Hybrid System ◽  
Palm Oil ◽  
Cod Removal ◽  
Palm Oil Mill Effluent ◽  
Iron Sulfate ◽  
Fenton Process ◽  
Ambient Conditions ◽  
Cod Removal Efficiency ◽  
Palm Oil Mill

Photocatalysis, electrolysis and Fenton process are three important advanced oxidation processes (AOPs) which produce hydroxyl radical in order to degrade organic matter in wastewater within 4-6 hours under ambient conditions. A photocatalysis, electrolysis and Fenton (photo-electro-Fenton) process hybrid system has been carried out to treat the diluted palm oil mill effluent (POME) in this study. An electrolytic cell was set up with a stainless steel anode and a platinum wire cathode with the applied cell voltage of 1.5 V. The diluted POME was then treated in the cell with the mixture of titanium oxide as the photocatalyst, sodium sulfate solution as the electrolyte, hydrogen peroxide and iron sulfate as the Fenton reagents. The effects on the duration, pH, concentration of TiO2 and different light conditions on the removal efficiency of the chemical oxygen demand (COD) of the diluted POME were studied. The optimal conditions for the photo-electro-Fenton hybrid system were found to be 4 hr contact time at pH 4 with 60 mg/L TiO2 under sunlight. With such conditions, the COD removal efficiency was able to achieve 97 %. On the other hand, the photo-electro-Fenton hybrid system gave the highest COD removal efficiency, compared to the electro-Fenton hybrid system, Fenton and photocatalyst, respectively.

scholarly journals AVALIAÇÃO DA EFICIÊNCIA DE AGENTES COAGULANTES EM EFLUENTE DE FRIGORÍFICO

2020 ◽  
Vol 12 (1) ◽  
pp. 11-19
Author(s):  
Alexandre Teixeira Souza ◽  
Danielli Chagas
Keyword(s):  
Comparative Study ◽  
Removal Efficiency ◽  
Small Variation ◽  
Cod Removal ◽  
The Other ◽  
Anionic Polymer ◽  
Turbidity Removal ◽  
Natural Coagulant ◽  
Aluminum Sulphate ◽  
Vegetable Tannin

In the refrigeration industry, a large amount of water is used throughout processes, generating effluents that need treatment before release. The purpose of this work was to make a comparative study of three coagulants used in the treatment of effluents: Aluminum Polychloride (PAC), Aluminum Sulphate (Al2(SO4)3) and Vegetable Tannin, with the aid of a flocculant (Anionic Polymer) by analyzing COD removal efficiency and turbidity. Jar coagulation / flocculation tests were conducted to optimize the concentration of coagulants. It was found that the natural coagulant presented a small variation in the pH parameter, avoiding the use of chemicals for its correction. The results of turbidity removal percentages indicated a great potential for Tannin when compared to the other chemical coagulants.

scholarly journals Mineralization of Hazardous Waste Landfill Leachate using Photo-Fenton Process

2018 ◽  
Vol 65 ◽  
pp. 05012 ◽  
Author(s):  
Pradeep Kumar Singa ◽  
Mohamed Hasnain Isa ◽  
Yeek-Chia Ho ◽  
Jun-Wei Lim
Keyword(s):  
Reaction Time ◽  
Operating Conditions ◽  
Cod Removal ◽  
Molar Ratio ◽  
Optimum Operating ◽  
Fenton Process ◽  
Batch Mode ◽  
Fenton Reagents ◽  
Uv Lamp ◽  
Fenton Oxidation Process

This study was conducted to evaluate the COD removal efficiency of Photo-Fenton oxidation process. The reagents used in the Photo-Fenton process are catalyst Fe2+ and H2O2 as oxidizing agent. A 16W UV lamp was used to carry out the experiments. All the experiments were performed in batch mode to investigate the influence of operating conditions viz., Fenton reagents dosage, molar ratio and reaction time. The maximum COD removal observed was 68% under optimum operating conditions. The operating conditions H2O2/Fe2+ molar ratio = 3 and reaction time = 90 minutes were found to optimum. The dosages of Fenton reagents i.e. hydrogen peroxide and Fe2+ were optimum at 0.09 mol/L and 0.03 mol/L respectively.

Treatment of Sodium Formate Wastewater by Fenton Oxidation Process

2012 ◽  
Vol 573-574 ◽  
pp. 627-630
Author(s):  
Zhi Gang Chen ◽  
Rui Xue Zhang ◽  
Bo Zhang ◽  
An Ping Wei
Keyword(s):  
Reaction Time ◽  
Removal Efficiency ◽  
Oxidation Process ◽  
Ph Value ◽  
Sodium Formate ◽  
Cod Removal ◽  
Fenton Oxidation ◽  
Fenton Process ◽  
Initial Ph ◽  
Fenton Oxidation Process

In this study, in order to reduce the sodium formate concentration thereby reducing toxicity, the treatment of this wastewater by Fenton process was investigated. The effects of initial PH value, reaction time, concentration of FeSO4• 7H2O, and H2O2 dosage on the removal efficiency of COD were studied respectively. The experiment results show that when using Fenton oxidization pretreatment process, with pH 2.0, FeSO4•7H2O concentration 4000mg/L, H2O2(30 % ) portion 4ml/L, and reaction time 20min, COD removal efficiency was more than 50%, oxidization efficiency was good.

An Experimental Investigation of Mechanism and Operating Conditions of Multi-Stage Reversing-Flow Bioreactor (MRB) in Treating Domestic Wastewater

1992 ◽  
Vol 26 (9-11) ◽  
pp. 2469-2472 ◽  
Author(s):  
S. Arora ◽  
T. Mino
Keyword(s):  
Experimental Investigation ◽  
Removal Efficiency ◽  
Methane Production ◽  
Domestic Wastewater ◽  
Operating Conditions ◽  
Cod Removal ◽  
Aerobic Degradation ◽  
Yield Coefficient ◽  
Organic Loading ◽  
Multi Stage

An experimental investigation of mechanism and operating conditions of Multi-Stage Reversing - Flow Bioreactor (MRB) in treating domestic wastewater was carried out. Aerobic degradation, dissimilation of Sulfur compounds and assimilation of Sulfur microorganisms were the main mechanisms involved in COD removal. Methane production was found to be negligible. At an upflow velocity of 73 m/d with an organic loading upto 1.66 kg COD/cum.d, without recycling of wastewater, 85-90 % COD removal efficiency and 15-20 mg/l of effluent SS were observed. However by recycling of wastewater same performance was achieved with an upflow velocity of 109 m/d and an organic loading of 2.4 kg COD/cum.d. Yield coefficient was found to vary between 0.12-0.18.

Transformation characteristics of organic pollutants in Fered-Fenton process for dry-spun acrylic fiber wastewater treatment

2014 ◽  
Vol 70 (12) ◽  
pp. 1976-1982 ◽  
Author(s):  
Jian Wei ◽  
Yonghui Song ◽  
Xiaoguang Meng ◽  
Xiang Tu ◽  
Jean-Stéphane Pic
Keyword(s):  
Removal Efficiency ◽  
Organic Pollutants ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Gas Chromatography Mass Spectrometry ◽  
Fenton Process ◽  
Fluorescence Excitation ◽  
Feeding Mode ◽  
Acrylic Fiber ◽  
Cod Removal Efficiency

The Fered-Fenton process using Ti sheet as cathode and RuO2/Ti as anode was employed for the pretreatment of dry-spun acrylic fiber manufacturing wastewater. The effects of feeding mode and concentration of H2O2 on chemical oxygen demand (COD) removal efficiency as well as the biodegradability variation during the Fered-Fenton process were investigated. The feeding mode of H2O2 had significant influence on COD removal efficiency: the removal efficiency was 44.8% if all the 60.0 mM H2O2 was fed at once, while it could reach 54.1% if the total H2O2 was divided into six portions and fed six times. The biochemical oxygen demand/COD ratio increased from 0.29 to above 0.68 after 180 min treatment. The transformation characteristics of organic pollutants during the Fered-Fenton process were evaluated by using gas chromatography–mass spectrometry (GC-MS), Fourier transform infrared spectroscopy (FTIR) and fluorescence excitation–emission matrix (EEM) spectroscopy. Most of the refractory organic pollutants with aromatic structure or large molecular weight were decomposed during the Fered-Fenton process.

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