scholarly journals Influence of ultrasound on the heterogeneous Fenton-like oxidation of acetic acid

2017 ◽  
Vol 76 (10) ◽  
pp. 2793-2801
Author(s):  
Aydın Cihanoğlu ◽  
Gönül Gündüz ◽  
Meral Dükkancı
Keyword(s):  
Acetic Acid ◽  
Chemical Oxygen Demand ◽  
Carboxylic Acids ◽  
Oxidation Process ◽  
Oxygen Demand ◽  
Hybrid Process ◽  
Ultrasonic Power ◽  
Heterogeneous Fenton ◽  
Cod Reduction ◽  
Ultrasonic Bath

Abstract The main objective of this study is to investigate the effect of ultrasound on the heterogeneous Fenton-like oxidation of acetic acid, which is one of the most resistant carboxylic acids to oxidation. For this purpose, firstly, the degradation of acetic acid was examined by using ultrasound alone and the effects of different parameters such as: type of sonication system, ultrasonic power, and addition of H2O2 were investigated on the degradation of acetic acid. There was no chemical oxygen demand (COD) reduction in the presence of sonication alone. In the presence of the heterogeneous Fenton-like oxidation process alone, at 303 K, COD reduction reached only 7.1% after 2 h of reaction. However, the combination of the heterogeneous Fenton-like oxidation process with ultrasound increased the COD reduction from 7.1% to 25.5% after 2 h of reaction in an ultrasonic bath operated at 40 kHz, while the COD reduction only increased from 7.1% to 8.9% in the ultrasonic reactor operated at 850 kHz. This result indicates that the hybrid process of ultrasound and heterogeneous Fenton-like oxidation is a promising process to degrade acetic acid.

REMOVAL OF DYE AND CHEMICAL OXYGEN DEMAND (COD) REDUCTION FROM TEXTILE INDUSTRIAL WASTEWATER USING HYBRID BIOREACTORS

2014 ◽  
Vol 13 (1) ◽  
pp. 43-50 ◽  
Author(s):  
Ghasem Najafpour Darzi ◽  
Reza Katal ◽  
Hossein Zare ◽  
Seyed Omid Rastegar ◽  
Poorya Mavaddat
Keyword(s):  
Chemical Oxygen Demand ◽  
Industrial Wastewater ◽  
Oxygen Demand ◽  
Cod Reduction

The use of steel slags in the heterogeneous Fenton process for decreasing the chemical oxygen demand of oil refinery wastewater

2018 ◽  
Vol 78 (5) ◽  
pp. 1159-1167 ◽  
Author(s):  
Behnam Heidari ◽  
Mohsen Soleimani ◽  
Nourollah Mirghaffari
Keyword(s):  
Microwave Irradiation ◽  
Chemical Oxygen Demand ◽  
Steel Slag ◽  
Oxygen Demand ◽  
Oil Refinery ◽  
Fenton Process ◽  
Refinery Wastewater ◽  
Optimum Conditions ◽  
Heterogeneous Fenton ◽  
Oil Refinery Wastewater

Abstract The Fenton process is a useful and inexpensive type of advanced oxidation process for industrial wastewater treatment. This study was performed with the aim of using the steel slag as a catalyst in the heterogeneous Fenton process in order to reduce the chemical oxygen demand (COD) of oil refinery wastewater. The effects of various parameters including the reaction time (0.5, 1.0, 2.0, 3.0 and 4.0 h), pH (2.0, 3.0, 4.0, 5.0, 6.0 and 7.0), the concentration of steel slag (12.5, 25.0 and 37.5 g/L), and H2O2 concentration (100, 250, 400 and 500 mg/L) on the Fenton process were investigated. Furthermore, the effect of microwave irradiation on the process efficiency was studied by considering the optimum conditions of the mentioned parameters. The results showed that using 25.0 g/L of steel slag and 250 mg/L H2O2, at pH = 3.0, could reduce COD by up to 64% after 2.0 h. Also, microwave irradiation decreased the time of the process from 120 min to 25 min in the optimum conditions, but it consumed a high amount of energy. It could be concluded that steel slags had a high potential in the treatment of oil refinery wastewater through the Fenton process.

Electrochemical Peroxidation Method for Reduction of Chemical Oxygen Demand (COD) Carbofuran in Furadan 3GR Pesticides

2021 ◽  
Vol 18 (2) ◽  
pp. 181-191
Author(s):  
Ayu Sri Wahyuni ◽  
Suhartana Suhartana ◽  
Damar Nurwahyu Bima
Keyword(s):  
Chemical Oxygen Demand ◽  
Ir Spectrum ◽  
Electrochemical Method ◽  
Oxygen Demand ◽  
Preliminary Test ◽  
Electrochemical Methods ◽  
Optimum Conditions ◽  
Cod Reduction ◽  
Spectrum Measurement ◽  
Measurement Results

Carbofuran is a pollutant compound derived from the pesticide Furadan 3GR which is widely used in agriculture. Various methods of carbofuran degradation have been carried out, one of which is the conventional electrochemical method. This study used an electrochemical peroxidation process to degrade Carbofuran in the pesticide Furadan 3GR. This study aims to determine the optimum conditions (time, Na2SO4 concentration, and volume addition of H2O2) for electrochemical peroxidation and to compare the effectiveness of electrochemical and electrochemical peroxidation methods by measuring the parameter of carbofuran COD reduction. The significance of the electrochemical peroxidation method and the conventional electrochemical method was compared as a preliminary test. The COD reduction of Carbofuran using traditional electrochemical methods and electrochemical peroxidation was 45.76% and 88.70%, respectively. Batch carbofuran electrochemical peroxidation process was accomplished to ascertain the optimum conditions under various operation times, the concentration of Na2SO4, and the additional volume of H2O2. The largest COD reduction of 93.78% was obtained at 10 minutes, 75 mM Na2SO4, and 2 mL H2O2. The UV-Vis spectrophotometric absorption of Carbofuran at a wavelength of 274 nm was significantly reduced from 1.377 to 0.131 at optimum conditions. The IR spectrum measurement results indicate a reduction in absorbance for the N-H group (3383 cm-1) and the C=O group (1643 cm-1) at optimum conditions. Overall, the electrochemical peroxidation process proved to be an appropriate technique for COD reduction of Carbofuran in Furadan 3GR pesticides.

Bioremoval of textile dyes with different chemical structures by Aspergillus versicolor in molasses medium

2012 ◽  
Vol 66 (10) ◽  
pp. 2177-2184 ◽  
Author(s):  
Burcu Ertit Taştan ◽  
Sevgi Ertuğrul Karatay ◽  
Gönül Dönmez
Keyword(s):  
Chemical Oxygen Demand ◽  
Laccase Activity ◽  
Oxygen Demand ◽  
Aspergillus Versicolor ◽  
Cod Reduction ◽  
Chemical Structures ◽  
Ph Values ◽  
Optimum Ph ◽  
Aspergillus Sp

Bioremoval of 17 dyes with different chemical structures by Aspergillus versicolor was detected in this study. Maxilon Red GRL (MR-GRL), Everdirect Fast Black VSF (EFB-VSF) and Brillant Blue R (BB-R) were removed better by fungal mycelia. Optimum pH values were found as 6 for all three dyes. In further experiments in the highest dye concentrations tested in this study, 58.3, 100 and 49% removal yields and 14.8, 12.6, 9.0 qm values were found for MR-GRL, EFB-VSF and BB-R, respectively. Chemical oxygen demand (COD) reduction after seven days of incubation period and role of laccase activity of Aspergillus sp. were also investigated. COD reduction and laccase activities were 55.6% and 2.93 U/mL for MR-GRL, 90.7% and 3.0 U/mL for EFB-VSF and 69.0% and 1.79 U/mL for BB-R, respectively. According to these results A. versicolor deserves notable attention for removal of these dyes in wastewater effluents.

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 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

scholarly journals Cleaner Production Assessment of Fast Bordeaux GP Base

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Mausumi Mukhopadhyay ◽  
Rashmita D. Patel
Keyword(s):  
Acetic Acid ◽  
Acetic Anhydride ◽  
Chemical Oxygen Demand ◽  
Pilot Plant ◽  
Oxygen Demand ◽  
Feasibility Studies ◽  
Cleaner Production ◽  
Raw Material ◽  
Molar Ratio ◽  
High Chemical Oxygen Demand

The pilot plant study of cleaner production (CP) process of a dyes intermediate, Fast Bordeaux GP Base (2-nitro-p-anisidine), is presented in this work. The existing production process with acetic anhydride as raw material generates highly polluting (high chemical oxygen demand), huge-volume effluent, and thus the treatment is expensive. In the proposed process, raw material acetic anhydride in acetylation step is replaced with acetic acid. The reaction conditions like reaction time (3 h), temperature (120∘C) and molar ratio of p-anisidine and acetic acid (1 : 3.58) are optimized in the laboratory scale and implemented in pilot plant. The extent of conversion has been monitored by nitrite value test, and purity of product mixture is measured with thin-layer chromatography (TLC). The acidic wastewater quantity is dramatically reduced by incorporating recycling in washing scheme, and thus water consumption is reduced. Reduction in wastewater generation and reduction/elimination of treatment cost is also observed. Chemical oxygen demand (COD) of the effluent stream is reduced by the recovery of by-products sodium acetate and spent acid. The technoeconomical feasibility studies show that the proposed CP options are highly economical and environmental friendly.

Whey decontamination by kefir immobilized on grape stalks

2016 ◽  
Vol 27 (2) ◽  
pp. 167-177
Author(s):  
Magdalini Soupioni ◽  
Alexandra Psarologou
Keyword(s):  
Chemical Oxygen Demand ◽  
Biochemical Oxygen Demand ◽  
Uptake Rate ◽  
Design Methodology ◽  
Alcoholic Fermentation ◽  
Oxygen Demand ◽  
Content Type ◽  
Cod Reduction ◽  
First Time ◽  
Grape Stalks

Purpose – The purpose of this paper is to evaluate the possibility of a new biocatalyst prepared by kefir cells immobilization on grape stalks (GS) to reduce quickly and efficiently the Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) of the waste whey during its fermentation producing potable ethanol. Design/methodology/approach – Many batch whey fermentations were carried out in order the effect of various conditions (pH, temperature) on 14C-labeled lactose uptake rate by the GS-immobilized kefir cells and consequently on fermentation rate as well as on ethanol production and whey BOD and COD reduction to be determined. Findings – It has been illustrated that GS-biocatalyst was suitable for whey BOD and COD reduction by about 32 and 25 percent, respectively during whey alcoholic fermentation at 30°C and pH 5.5 in only ten hours, producing about 3.30 percent w/v of ethanol. Originality/value – The findings of this research may enhance the existing literature on whey exploitation, for the first time focussing on the use of cheap and abundant GS as support for kefir immobilization during whey fermentation, which is potentially acceptable by industries in order to reduce fast and easily the whey polluting load and produce ethanol.

scholarly journals Aplikasi Metode Advance Oxidation Process (AOP) Fenton pada Pengolahan Limbah Cair Pabrik Kelapa Sawit

2016 ◽  
Vol 11 (1) ◽  
pp. 1 ◽  
Author(s):  
Ruka Yulia ◽  
Hesti Meilina ◽  
Adisalamun Adisalamun ◽  
Darmadi Darmadi
Keyword(s):  
Response Surface Methodology ◽  
Chemical Oxygen Demand ◽  
Response Surface ◽  
Oxidation Process ◽  
Oxygen Demand ◽  
Total Suspended Solid ◽  
Suspended Solid ◽  
Box Behnken Design ◽  
Advance Oxidation Process

Penelitian ini bertujuan untuk mengetahui kemampuan proses Fenton dalam menurunkan kadar chemical oxygen demand (COD) dan kadar total suspended solid (TSS) dari limbah cair pabrik kelapa sawit (PKS) dan menentukan kondisi optimum dari parameter yang digunakan dengan Response Surface Methodology menurut Box- Behnken design. Sampel diambil pada keluaran pertama kolam anaerobik ketiga dari instalasi pengolahan limbah cair kelapa sawit yang mengandung nilai COD berkisar antara 8.000 hingga 12.000 ppm. Pada penelitian ini, dilakukan pengujian pada berbagai pH, konsentrasi FeSO4.7H2O dan konsentrasi hidrogen peroksida. Hasil  penelitian menunjukkan bahwa kemampuan proses AOP dengan metode Fenton dapat menurunkan konsentrasi COD dan TSS masing-masing adalah 70,7704% dan 88,3897% pada konsentrasi FeSO4.7H2O 3703,52 ppm, konsentrasi H2O2 5586,43 ppm, dan pH 3.

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