Coupled photochemical-biological system to treat biorecalcitrant wastewater

2007 ◽  
Vol 55 (12) ◽  
pp. 95-100 ◽  
Author(s):  
J. Bacardit ◽  
V. García-Molina ◽  
B. Bayarri ◽  
J. Giménez ◽  
E. Chamarro ◽  
...  
Keyword(s):  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Oxygen Demand ◽  
Coupled System ◽  
Synthetic Wastewater ◽  
Second Step ◽  
Photochemical Process ◽  
Whole Process ◽  
Toc Removal ◽  
Start Up

The aim of the present work is to study a coupled system to treat biorecalcitrant wastewaters. The combination consists of an advanced oxidation process (AOP) named photo-Fenton (Ph-F), which is a photochemical treatment and a sequencing batch biofilter reactor (SBBR). The synthetic wastewater used to optimise this process is a solution of 200 ppm of 4-chlorophenol (4-CP). The first part of the work is the study of the biodegradability enhancement achieved by the photochemical process, measured as the ratio between the biochemical oxygen demand (BOD5) and the chemical oxygen demand (COD). The second step is the start-up and optimisation of the biological process. The results showed that it is necessary to severely treat the toxic solution (with 500 ppm of [H2O2]0) in order to achieve more than 90% of TOC removal in the whole process. The photochemical and biological treatments lasted 50 minutes and 24 hours, respectively.

Phenolic Wastewater Treatment by Microwave-Induced H2O2-Fe (III)-Cu (II)/γ-Al2O3 Catalytic Oxidation Process

2013 ◽  
Vol 777 ◽  
pp. 101-105
Author(s):  
Jie Zhang ◽  
Wei Qian Pan ◽  
Tong Zheng ◽  
Peng Wang
Keyword(s):  
Catalytic Oxidation ◽  
Oxidation Process ◽  
Synthetic Wastewater ◽  
Reaction Rate Constants ◽  
Toc Removal ◽  
First Order Kinetics ◽  
Phenolic Pollutants ◽  
Phenolic Wastewater ◽  
Ph Range ◽  
Induction Stage

To achieve efficient removal of phenolic pollutants in water, the catalyst of Fe (III)-Cu (II)/γ-Al2O3 was prepared. In the presence of Fe (III)-Cu (II)/γ-Al2O3, microwave-induced hydrogen peroxide (H2O2) catalytic oxidation process was conducted for the treatment of synthetic wastewater containing PNP, a representative of phenolic pollutants. Effectiveness of the process and factors influencing PNP removal were investigated and results showed microwave-induced H2O2-Fe (III)-Cu (II)/γ-Al2O3 process could achieve 99.41% PNP removal percentage, corresponding to 77.9% TOC removal in a given condition. The process remained effective in the 2-8 pH range with high reusability of Fe (III)-Cu (II)/γ-Al2O3 catalyst. The kinetics study showed microwave-induced H2O2-Fe (III)-Cu (II)/γ-Al2O3 process could be divided into microwave induction stage and catalytic oxidation stage, both of which fitted first-order kinetics, with reaction rate constants of 0.0453 min-1 and 4.7552 min-1 respectively.

scholarly journals DEGRADAÇÃO DO CORANTE AZUL REATIVO 5G PELO PROCESSO OXIDATIVO AVANÇADO UV/H2O2

e-xacta ◽  
2016 ◽  
Vol 9 (2) ◽  
Author(s):  
Denis Rafael de Souza Lima ◽  
Isabela Luiza Alves de Almeida ◽  
Vanderlei Inácio de Paula
Keyword(s):  
Hydrogen Peroxide ◽  
Ultraviolet Radiation ◽  
Chemical Oxygen Demand ◽  
Lactuca Sativa ◽  
Azo Dye ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Oxygen Demand ◽  
Liquid Wastes ◽  
Optimized Conditions

<p>Neste trabalho avaliou-se a aplicação do processo oxidativo avançado (POA) de foto-peroxidação (UV/H<sub>2</sub>O<sub>2</sub>) na degradação do azocorante têxtil comercial Azul Reativo 5G. Foram preparadas soluções sintéticas contendo o corante e tratadas através do respectivo POA, sendo a eficiência do tratamento avaliada através dos seguintes parâmetros: descoloração, redução da demanda química de oxigênio (DQO) e ecotoxicidade com sementes de Lactuca sativa. Após 30 minutos de tratamento em condições otimizadas na presença de peróxido de hidrogênio e radiação ultravioleta, foi observada descoloração na ordem de 91,8% sem redução significativa da DQO (1,8%), além de diminuição da ecotoxicidade da solução, indicando a viabilidade da aplicação do processo UV/H<sub>2</sub>O<sub>2</sub> para tratamento de resíduos líquidos contendo este azocorante.</p><p>ABSTRACT</p><p>In the present paper was evaluated the application of advanced oxidation process (AOP) photo-peroxidation (UV/H<sub>2</sub>O<sub>2</sub>) applied to degradation of the commercial textile azo dye Reactive Blue 5G. Synthetic solutions were prepared containing the dye, treated through the respective AOP and the efficiency of the treatment evaluated by the following parameters: discoloration, reduction of chemical oxygen demand (COD) and ecotoxicity with Lactuca sativa seeds. After 30 minutes of treatment in optimized conditions in the presence of hydrogen peroxide and ultraviolet radiation, discoloration was observed in order of 91.8% without significant reduction of COD (1.8%), but decrease in the ecotoxicity of the solution, indicating feasibility of the process UV/H<sub>2</sub>O<sub>2</sub> for treating liquid wastes containing this azo dye.</p>

scholarly journals Removing BOD, COD, and Decolorization of Batik Cual Wastewater Using Fenton Mechanism

2021 ◽  
Vol 10 (1) ◽  
pp. 139-148
Author(s):  
Rika Favoria Gusa ◽  
Diana Novita Sari ◽  
Fitri Afriani ◽  
Wahri Sunanda ◽  
Yuant Tiandho
Keyword(s):  
Wastewater Treatment ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Organic Dyes ◽  
Liquid Waste ◽  
Oxygen Demand ◽  
Degradation Efficiency ◽  
Color Degradation ◽  
Colored Wastewater

During the production of batik cual, thick-colored wastewater is produced. Unfortunately, the wastewater could damage the environment if it is disposed of without specific processing. The Fenton method is an advanced oxidation process (AOPs) that can degrade organic dyes found in liquid waste. In this research, the researchers studied the Fenton mechanism's application to the batik cual wastewater treatment. The Fenton's reagent used was H2O2 with FeSO4.7H2O. Some of the experimental wastewater treatment parameters were the values of biological oxygen demand (BOD), chemical oxygen demand (COD), the degradation efficiency of difficult to decompose organic materials, and the color degradation efficiency in batik cual wastewater. The results show that the Fenton mechanism’s efficiency of removing color from batik cual wastewater is up to 97.8%, COD and BOD removal efficiencies are 76.3% and 75.2%, and the degradation efficiency of difficult to decompose organic matter is 76.8%. Also, the researchers found that the higher amounts of FeSO4.7H2O increase the removal parameters effectiveness. Therefore, the Fenton mechanism can effectively improve the quality of wastewater in batik cual production.

scholarly journals Pengaruh Variasi Rasio H2O2/COD dan Tegangan Terhadap Penurunan COD Air Limbah Rumah Sakit dengan Metode Elektro – Fenton

2020 ◽  
Vol 4 (2) ◽  
pp. 15
Author(s):  
Fami Amalia Putri ◽  
Sarto Sarto ◽  
Ahmad Tawfiequrrahman Yuliansyah
Keyword(s):  
Chemical Oxygen Demand ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Oxygen Demand ◽  
Advanced Oxidation

Limbah Rumah Sakit memiliki senyawa polutan yang tinggi, beracun, dan bahkan ada yang bersifat radioaktif. Limbah yang paling banyak terdapat di Rumah Sakit yaitu limbah dalam bentuk cair yang mengandung limbah obat – obatan seperti jenis antibiotik, beberapa mikroorganisme patogen, dan kandungan logam berat yang dapat mencemari lingkungan hidup, mengganggu kesehatan manusia dan makhluk hidup lain. Limbah Rumah Sakit Kota Yogyakarta mempunyai kadar COD yang tinggi yaitu 421,03 mg/L dengan pH sebesar 7,3. Advanced Oxidation Process (AOPs) telah banyak terbukti dapat menurunkan kadar COD limbah industri maupun domestik. Pada penelitian ini, AOPs yang dipilih adalah Elektro – Fenton. Penelitian ini bertujuan untuk memperoleh kondisi operasi yang maksimum pada metode Elektro - Fenton dan mengetahui pengaruh dari parameter yang digunakan untuk menurunkan kadar Chemical Oxygen Demand (COD). Penanganan uji COD dilakukan untuk mengetahui pengurangan kadar oksigen pada air limbah agar sesuai dengan standar baku mutu air limbah Rumah Sakit yang dapat dibuang ke lingkungan yaitu sebesar 80 ppm. Proses Elektro – Fenton dilakukan secara batch, dengan variasi rasio H2O2/COD yang digunakan terdiri dari 2,125; 10; dan 19, 16 (g/g). Sedangkan variasi tegangan sebesar 3 volt, 4 volt, dan 5 volt. Kondisi maksimum diperoleh pada rasio H2O2/COD 10 (g/g) dan tegangan 4 volt dengan waktu kontak 60 menit. Kata Kunci : air limbah rumah sakit, elektro – fenton, proses oksidasi lanjutan, kebutuhan oksigen kimiawi, hidrogen peroksida

Removal of Refractory Organic Compounds from Wastewater by Various Advanced Oxidation Process - A Review

2019 ◽  
Vol 6 (1) ◽  
pp. 8-16 ◽  
Author(s):  
Manjari Srivastav ◽  
Meenal Gupta ◽  
Sushil K. Agrahari ◽  
Pawan Detwal
Keyword(s):  
Organic Compounds ◽  
Conventional Treatment ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Oxygen Demand ◽  
Ultra Violet ◽  
Advanced Oxidation ◽  
Complete Removal ◽  
Pollutant Removal ◽  
Treatment Technologies

Per capita average annual freshwater availability is gradually reduced due to increasing population, urbanization and affluent lifestyles. Hence, management of wastewater is of great concern. The wastewater from different industries can be treated by various conventional treatment methods but these conventional treatment technologies seem to be ineffective for the complete removal of pollutants especially refractory organic compounds that are not readily biodegradable in nature. Detergents, detergent additives, sequestering agents like EDTA, Pesticides, Polycyclic aromatic hydrocarbons, etc. are some of the recalcitrant organic compounds found in the wastewater. One of the treatment technologies for the removal of recalcitrant organic compounds is Advanced Oxidation Process (AOP). The production of hydroxyl free radical is the main mechanism for the AOP. AOP is a promising technology for the treatment of refractory organic compounds due to its low oxidation selectivity and high reactivity of the radical. Hydrogen peroxide (H2O2), Ozonation, Ultra-violet (UV) radiation, H2O2/UV process and Fenton’s reaction are extensively used for the removal of refractory organic compounds thus reducing Chemical Oxygen Demand (COD), Total Organic Carbon (TOC), phenolic compounds, dyes etc. to great extent. From the studies, we found that Fenton’s reagents appear to be most economically practical AOP systems for almost all industries with respect to high pollutant removal efficiency and it is also economical. From the energy point of view, the ozone based process proves to be more efficient but it is costlier than the Fenton’s process.

scholarly journals Extended Fenton's process: toward improving biodegradability of drilling wastewater

2019 ◽  
Vol 79 (9) ◽  
pp. 1790-1797
Author(s):  
Ran Ding ◽  
Yanming Wang ◽  
Xing Chen ◽  
Yingxin Gao ◽  
Min Yang
Keyword(s):  
Organic Carbon ◽  
Total Organic Carbon ◽  
Oxidation Process ◽  
Oxygen Demand ◽  
Fenton Oxidation ◽  
Oxidation Time ◽  
Drilling Mud ◽  
Molecular Weights ◽  
Toc Removal ◽  
Fenton Oxidation Process

Abstract In this study, an extended Fenton process was used to improve biodegradability of the waste drilling mud containing bio-refractory polymers. Variation of biodegradability and organics with different molecular weights with the oxidation time were investigated during the Fenton oxidation process. Although the residual total organic carbon (TOC) arrived at a stable level soon after oxidation reaction, organics with the lower molecular weight increased and its biodegradability was improved significantly in the extended oxidation process, which originated from decomposition of residual H2O2 catalyzed by transformation of the Fe3+/Fe2+ and organoradicals. Under the conditions that follow: pH 3.0, H2O2 500 mg L−1, Fe2+ 250 mg L−1, oxidation time 120 min, further TOC removal of 35.9% and biochemical oxygen demand and total organic carbon (BOD/TOC) ratio of 0.83 was achieved. At the biological test, a substantial increase in TOC degradation by biological treatment with extension of Fenton oxidation time was observed. Finally, more than 90% biological removal of the TOC was achieved for the 120 min oxidation treatment. The experimental results highlight that an extended process can be adopted to improve the biodegradability of wastewater by utilization of the slow reaction of hydrogen peroxide with Fe3+ and organoradicals.

scholarly journals Application of Taguchi’s experimental design method for optimization of Acid Red 18 removal by electrochemical oxidation process

2018 ◽  
Vol 5 (4) ◽  
pp. 241-248 ◽  
Author(s):  
Zabihollah Yousefi ◽  
Ali Zafarzadeh ◽  
Abdolaziz Ghezel
Keyword(s):  
Electrochemical Oxidation ◽  
Current Density ◽  
Oxidation Process ◽  
Design Method ◽  
Oxygen Demand ◽  
Pollutant Removal ◽  
Fractional Factorial ◽  
Synthetic Wastewater ◽  
Electro Oxidation ◽  
Electro Coagulation

Background: Electro-oxidation is developed as an electrochemical method to overcome the problems of the conventional decolorization technologies and is an appropriate alternative for the treatment of colored wastewater from various industries. The purpose of this study was to evaluate the efficiency of the electrochemical oxidation process in removal of chemical oxygen demand (COD) and Acid Red 18 (AR18) dye from aqueous solutions. Methods: In this research, a laboratory scale of electro-coagulation reactor for the treatment of synthetic wastewater was made and studied. The effects of different variables including pH, current density, dye concentration, and electrolysis time were investigated. The experiment steps were designed by DesignExpert 10 software using the selected variables. Finally, the dye and COD analysis was performed by spectrophotometer. The optimization was performed using Taguchi fractional factorial design during the removal of dye and COD. Results: Maximum removal of dye (89%) and COD (72.2%) were obtained at pH=3, current density=20 mA/cm2 , initial dye concentration=100 mg/L, and reaction time=45 min. ANOVA test showed a significant relationship between statistical model and test data. Also, the results indicate that the distribution of the residues of the model was normal. Conclusion: By designing experiments through Taguchi method, the removal process will be optimized and by decreasing the number of experiments, the optimal conditions for pollutant removal will be prepared. The results suggest that the Electro-oxidation system is a very suitable technique for the enhancement of wastewater treatment.

Treatment of diglyme containing wastewater by advanced oxidation - process design and optimisation

2001 ◽  
Vol 44 (5) ◽  
pp. 287-293 ◽  
Author(s):  
D. Grossmann ◽  
H. Köser ◽  
R. Kretschmer ◽  
M. Porobin
Keyword(s):  
Hydrogen Peroxide ◽  
Process Design ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Synthetic Process ◽  
Oxidation Processes ◽  
Toc Removal ◽  
Irradiation Energy ◽  
H2o2 Oxidation

Diglyme (CAS No. 111-96-6), a biorefractive ether with teratogenic properties is of considerable importance as a solvent in the synthetic chemical industry. Results of lab-scale investigations into the optimal conditions for the oxidative mineralisation of 0.05 to 1 g/L of diglyme in synthetic process waters by hydrogen peroxide and ozone based advanced oxidation processes are presented. Fenton, photo-assisted Fenton and UV/H2O2 oxidation processes show acceptable TOC removals. At 50°C the initial TOC removal rates varies between 0.07 and 6g TOC/L*h. The rates increase with the initial diglyme and hydrogen peroxide concentration as well as with the UV irradiation energy intensity. For example at a 1g/l diglyme concentration a stoichiometric H2O2 addition resulted in TOC degradation of 60% to 70% after 30 minutes under the investigated conditions. Treatment with ozone/H2O2 at a pH of 8 and 25°C required at least 100 minutes to achieve comparable mineralisation results. Biodegradability can be reached in far shorter times. Ozone on its own cannot be recommended for diglyme treatment. If complete mineralisation of diglyme is the objective, the UV/H2O2 oxidation process should be favoured. The ozone/H2O2 process might offer a viable alternative in cases where the oxidation step is followed by biological wastewater treatment, so that biodegradability is aimed at.

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