scholarly journals Oxidative degradation of gentamicin present in water by an electro-Fenton process and biodegradability improvement

2019 ◽  
Vol 17 (1) ◽  
pp. 1017-1025
Author(s):  
Mohamed Réda Arhoutane ◽  
Muna Shueai Yahya ◽  
Miloud El Karbane ◽  
Kacem El Kacemi
Keyword(s):  
Chemical Oxygen Demand ◽  
Biological Process ◽  
Oxidative Degradation ◽  
Oxygen Demand ◽  
Polluted Water ◽  
Applied Current ◽  
Pseudo First Order Reaction ◽  
First Order ◽  
Appropriate Treatment ◽  
By Products

AbstractIn the context of environmental protection, where there is a need to develop effective operations for carrying out appropriate treatment of polluted water by pharmaceuticals. Therefore, the present study aims at evaluating the degradation for gentamicin through electro-Fenton (EF) operation, through taking into consideration the effect of several parameters of experimental in the process, namely, the concentration of initial gentamicin, the applied current and the Fe+2 (II) quantities. The (EF) operation employed involves a carbon-felt as cathode and platinum as anode at pH 3. Studies for the gentamicin kinetics is monitored by HPLC giving a pseudo-first order reaction following by a chemical oxygen demand, with a reached degree of mineralization 96% after of four hours of treatment through current 100 mA/cm2 with 0.1 mM of Fe+2. We find that the degradation for molecule of gentamicin is accompanied by an augmentation of the biodegradability, assesse through the Biochemical Oxygen Demand (BOD5) on chemical oxygen demand (COD) ratio, that augmentation from 0 to 0.41 before treatment after 30 min for EF treatment, showing that there is potential for conjugation of the EF process and the biological process. Furthermore, the by-products have been identified on the basis of HPLC-MS/MS results.

scholarly journals Removal of pyrazinamide and its by-products from water: Treatment by electro-Fenton process and feasibility of a biological post-treatment

2019 ◽  
Vol 8 (1) ◽  
pp. 53-65 ◽  
Author(s):  
Mohamed Reda Arhoutane ◽  
Muna Sh. Yahya ◽  
Miloud El Karbane ◽  
Aicha Guessous ◽  
Hind Chakchak ◽  
...  
Keyword(s):  
Liquid Chromatography ◽  
Oxidative Degradation ◽  
Oxygen Demand ◽  
Fenton Process ◽  
Applied Current ◽  
Liquid Chromatography Tandem Mass ◽  
Highperformance Liquid Chromatography ◽  
Successive Formation ◽  
Optimal Values ◽  
By Products

This paper reports a study on oxidative degradation and mineralization of pyrazinamide in an aqueous medium at pH = 3 and room temperature (≈ 19 °C) by the electro-Fenton process, using carbon felt as a cathode and platinum as an anode. The degradation/mineralization is assessed by the chemical oxygen demand by analyzing applied current intensity and concentration of Fe2+ catalyst. Thus, the main objective is to determine the optimal values of these parameters. Some stable intermediate products have been identified using highperformance liquid chromatography and liquid chromatography tandem mass spectrometry, which show the successive formation of the aromatic/cyclic organics and aliphatic intermediates. The second part of this work corresponds to the study of the biodegradability giving by the ratio: BOD5/COD during the mineralization of pyrazinamide by EF in order to examine the possibility of combining electro-Fenton with a biological posttreatment.

Electrochemical oxidative degradation of indigo wastewater based on chlorine-containing system

2020 ◽  
Vol 49 (1) ◽  
pp. 46-54 ◽  
Author(s):  
Wei Zhang ◽  
Weiwei Lv ◽  
Xiaoyan Li ◽  
Jiming Yao
Keyword(s):  
Chemical Oxygen Demand ◽  
Response Surface ◽  
Electrochemical Oxidation ◽  
Surface Analysis ◽  
Removal Rate ◽  
Oxidative Degradation ◽  
Oxygen Demand ◽  
Single Factor ◽  
Dyeing Wastewater ◽  
Content Type

Purpose In this study, the oxidative degradation performance of indigo wastewater based on electrochemical systems was explored. The decolourization degrees, removal rate of chemical oxygen demand and biochemical oxygen demand of the indigo wastewater after degradation were evaluated and optimized treatment conditions being obtained. Design/methodology/approach The single factor method was first used to select the electrolyte system and electrode materials. Then the response surface analysis based on Box–Behnken Design was chosen to determine the influence of four independent variables such as FeCl3 concentration, NaCl concentration, decolourization time and voltage on the degradation efficiency. Findings On the basis of single factor experiment, the electrode material of stainless steel was selected in the double cell, and the indigo wastewater was electrolyzed with FeCl3 and NaCl electrolytes. The process conditions of electrochemical degradation of indigo wastewater were optimized by response surface analysis: the concentration of FeCl3 and NaCl was of 16 and 9 g/L, respectively, with a decolourization time of 50 min, voltage of 10 V and decolourization percentage of 98.94. The maximum removal rate of chemical oxygen demand reached 75.46 per cent. The highest ratio of B/C was 3.77, which was considered to be more biodegradable. Research limitations/implications Dyeing wastewater is bringing out more and more pollution problems to the environment. However, there are some shortcomings in traditional technologies such as adsorption and filtration. As a kind of efficient and clean water treatment technology, electrochemical oxidation has been applied to the treatments of various types of wastewater. The decolourization and degradation of indigo wastewater is taken as an example to provide reference for the treatment of wastewater in actual plants. Practical implications The developed method provided a simple and practical solution for efficiently degrading indigo wastewater. Originality/value The method for the electrochemical oxidation technology was novel and could find numerous applications in the degradation of printing and dyeing wastewater.

UV-Vis/Ferrioxalate/H2O2 System on Degradation of Anthraquinone Dye Wastewater

2011 ◽  
Vol 239-242 ◽  
pp. 2597-2601
Author(s):  
Wei Ding ◽  
Ming Ke ◽  
Zhao Zheng Song
Keyword(s):  
Organic Carbon ◽  
Optimum Condition ◽  
Chemical Oxygen Demand ◽  
Removal Rate ◽  
Oxygen Demand ◽  
Optimum Concentration ◽  
Dye Wastewater ◽  
Anthraquinone Dye ◽  
First Order ◽  
Pseudo First Order

Anthraquinone dye Reactive Blue (KN-R) is first selected as the model dye to test the treatment of UV-vis/Ferrioxalate/H2O2system. The effect of parameters Fe2+/H2O2, pH and H2C2O4are synthetically assessed. The optimum concentration is obtained at 1:15 of Fe2+/H2O2and 30mg·L-1of H2C2O4 at pH=3.0 in 30min. Under the optimum condition, the removal rate of color, chemical oxygen demand (COD) and total organic carbon (TOC) are more than 99%, 87.7% and 66.8% respectively. The results show that the reaction accorded with a pseudo-first-order and the degeneration velocity of KN-R is 0.2459[dye](mg·L-1/min).

Kinetics of metribuzin degradation by colloidal manganese dioxide in absence and presence of surfactants

2014 ◽  
Vol 68 (1) ◽  
Author(s):  
Qamruzzaman ◽  
Abu Nasar
Keyword(s):  
Sodium Dodecyl ◽  
Oxidative Degradation ◽  
Activation Parameters ◽  
Water Soluble ◽  
Ionic Surfactant ◽  
Ammonium Bromide ◽  
Pseudo First Order Reaction ◽  
First Order ◽  
Colloidal Mno2 ◽  
Kinetics Of

AbstractThe kinetics of the degradation of metribuzin by water-soluble colloidal MnO2 in acidic medium (HClO4) were studied spectrophotometrically in the absence and presence of surfactants. The experiments were performed under pseudo-first-order reaction conditions in respect of MnO2. The degradation was observed to be of the first order in respect of MnO2 while of fractional order for both metribuzin and HClO4. The rate constant for the degradation of metribuzin was observed to decrease as the concentration of MnO2 increased. The anionic surfactant, sodium dodecyl sulphate (SDS), was observed to be ineffective whereas the non-ionic surfactant, Triton X-100 (TX-100), accelerated the reaction rate. However, the cationic surfactant, cetyltrimethyl ammonium bromide (CTAB), caused flocculation with oppositely-charged colloidal MnO2; hence further study was not possible. The catalytic effect of TX-100 was discussed in the light of the available mathematical model. The kinetic data were exploited to generate the various activation parameters for the oxidative degradation of metribuzin by colloidal MnO2 in the absence as well as the presence of the non-ionic surfactant, TX-100.

Influence of physico-chemical treatment on the subsequent biological process treating paper industry wastewater

2012 ◽  
Vol 66 (1) ◽  
pp. 217-223 ◽  
Author(s):  
Mouhamed el khames Saad ◽  
Younes Moussaoui ◽  
Asma Zaghbani ◽  
Imen Mosrati ◽  
Elimame Elaloui ◽  
...  
Keyword(s):  
Chemical Oxygen Demand ◽  
Chemical Treatment ◽  
Biological Treatment ◽  
Biological Process ◽  
Paper Industry ◽  
Oxygen Demand ◽  
Physico Chemical ◽  
Biodegradation Study ◽  
Pre Treatment ◽  
Industry Wastewater

The present paper presents the main results of the biodegradation study of paper industry wastewater through physico-chemical treatment. Indeed, around 60% of chemical oxygen demand (COD) removal can be achieved by electroflocculation treatment. Furthermore, a removal efficiency of the COD of almost 91% has been obtained by biological treatment, with activated amount of sludge for 24 h of culture. Concerning the physico-chemical pre-treatment of the untreated, filtered and electroflocculated rejection effluents, it has been investigated through the degradation curve of COD studies.

scholarly journals Influence of acidogenic fermented fish by-products with rice bran for sludge reduction and biogas recovery in anaerobic co-digestion

2020 ◽  
Vol 26 (1) ◽  
Author(s):  
Hee-Jeong Choi
Keyword(s):  
Sewage Sludge ◽  
Chemical Oxygen Demand ◽  
Rice Bran ◽  
Tap Water ◽  
Oxygen Demand ◽  
Lag Phase ◽  
Sludge Reduction ◽  
Acidogenic Fermentation ◽  
Volatile Solids ◽  
By Products

The purpose of this study was to investigate the effects of acidogenic fermentation broth with rice bran (RFFB), tap water (TFFB), or raw fishery by-products (FBs) on sludge reduction and biogas production in an anaerobic co-digestion process. Acidogenic fermentation of FBs with rice bran was faster and produced more volatile fatty acids than that with tap water. Reduction efficiencies for chemical oxygen demand, volatile solids, and total solids were highest in RFFB. In the kinetic analysis, λ (d), which represents the duration of the lag phase, was shortest with RFFB (1.09 d) and highest in sewage sludge (8.86 d). As the loading amount of volatile solids and chemical oxygen demand increased, the amount of cumulative biogas also increased. Amount of produced methane and energy recovery were highest with RFFB (5.71 kWh). Anaerobic co-digestion of FFB and sewage sludge allowed reduced sludge and recovered energy using the discarded waste as an organic carbon source.

Oxidative Degradation and Kinetics of Trichloroethylene by Thermally Activated Persulfate

2014 ◽  
Vol 675-677 ◽  
pp. 547-550
Author(s):  
Jun Jie Yue ◽  
Xiao Qiao Zhu ◽  
Yu Ting Wang ◽  
Yu Qin Zhang ◽  
Li Zhao ◽  
...  
Keyword(s):  
Oxidative Degradation ◽  
Chemical Oxidation ◽  
Molar Ratio ◽  
Pseudo First Order Reaction ◽  
In Situ Chemical Oxidation ◽  
First Order ◽  
Molar Ratios ◽  
Thermally Activated ◽  
Kinetics Of

In situ chemical oxidation with persulfate (PS) anion (S2O82-) is a viable technique for remediation of groundwater contaminants such as trichloroethylene (TCE). This laboratory study investigated the use of the oxidant sodium PS for the chemical oxidation of TCE at different conditions to determine the influence of temperature, pH, and the PS/TCE molar ratio. Experiments revealed that higher temperatures, lower pH, and higher PS/TCE molar ratios were to the benefit of TCE oxidation by PS. By investigating the reaction kinetics, the degradations of contaminant can be described by use of pseudo-first-order reaction. At the temperatures ranging from 25°C to 40°C, the activation energy for the degradation of TCE was determined to be 85.04 KJ/mol.

scholarly journals Studi Kinetik Proses Koagulasi dengan Koagulan Poly Aluminium Chloride dan Tawas dalam Pengolahan Limbah Cair Industri Tempe

Eksergi ◽  
2021 ◽  
Vol 18 (2) ◽  
pp. 43
Author(s):  
Iqbal Syaichurrozi
Keyword(s):  
Chemical Oxygen Demand ◽  
Oxygen Demand ◽  
Second Order ◽  
Mean Absolute Percentage Error ◽  
Aluminium Chloride ◽  
Percentage Error ◽  
First Order ◽  
Absolute Percentage Error ◽  
Pseudo Second Order ◽  
Pseudo First Order

Beberapa faktor yang mempengaruhi proses koagulasi dalam pengurangan chemical oxygen demand (COD) pada limbah cair adalah waktu proses, dosis koagulan dan jenis koagulan. Hidayah (2018) telah melakukan penelitian pengaruh ketiga faktor tersebut terhadap pengurangan COD pada limbah cair industri tempe selama proses koagulasi. Studi ini bertujuan untuk menyusun model kinetik baru yang dapat memprediksi unjuk kerja proses koagulasi menggunakan data dari penelitian Hidayah (2018). Model kinetik pseudo first order dan pseudo second order diuji untuk mendapatkan model yang paling baik. Kedua model tersebut menghasilkan akurasi yang hampir sama. Karena pseudo first order lebih sederhana, model ini dipilih sebagai model dasar pada studi ini. Selanjutnya dilakukan modifikasi sehingga diperoleh model kinetik baru sebagai berikut: Model kinetik ini berhasil diuji untuk memprediksi unjuk kerja koagulasi hasil penelitian Hidayah (2018) dengan nilai rata-rata Mean Absolute Percentage Error (MAPE) sebesar 10,8%.

scholarly journals Influence of microbial fuel cell with porous anode on voltage generation, chemical oxygen demand, chloride content and total dissolved solids

2020 ◽  
Vol 82 (7) ◽  
pp. 1285-1295
Author(s):  
Dhiraj Chaudhari ◽  
Harish Dubey ◽  
Datta Kshirsagar ◽  
Vijay Jadhav
Keyword(s):  
Chemical Oxygen Demand ◽  
Microbial Fuel Cells ◽  
Oxygen Demand ◽  
Cell Voltage ◽  
Chloride Content ◽  
Polluted Water ◽  
Maximum Output ◽  
Water Conductivity ◽  
Significant Drop ◽  
Ph Variation

Abstract Microbial fuel cells were developed using two different water sources: (1) unpolluted water (Kala Talao Lake) and (2) polluted water (Waldhuni River). The maximum output voltage provided by each source was compared, as was the cell voltage variation with anode porosity. The variation in power density of each cell with variation in anode porosity was also studied. The analysis of the MFCs' internal resistance (Rin) was also conducted and the variation with increased anode porosity was identified. The pH variation in both the MFCs is also reported. The cells' higher voltage output resulting in a lower pH was confirmed and variation of the pH gradient with increased porosity of anode was recorded. An analysis of the chemical oxygen demand (COD) values and water conductivity of the MFCs was also carried out. A significant drop in the COD values with increasing anode porosity occurred in both cells. The finding of increased porosity was also studied with decreased conductivity. In addition, variations in chloride content and total dissolved salts with porosity were performed.

Biodegradation of Bisphenol-A in aerobic membrane bioreactor sludge

2013 ◽  
Vol 68 (9) ◽  
pp. 1926-1931 ◽  
Author(s):  
Brahima Seyhi ◽  
Patrick Drogui ◽  
Gerardo Buelna ◽  
Jean François Blais
Keyword(s):  
Bisphenol A ◽  
Chemical Oxygen Demand ◽  
Rate Constant ◽  
Membrane Bioreactor ◽  
Oxygen Demand ◽  
Degradation Process ◽  
Order Kinetic ◽  
Kinetic Rate Constant ◽  
Kinetic Rate ◽  
First Order

Bisphenol-A (BPA) biodegradation was studied in a membrane bioreactor under aerobic conditions. The effects of the initial BPA concentration and initial chemical oxygen demand (COD) concentration on BPA biodegradation were investigated. The degradation process followed a first-order kinetic (more than 98% of BPA was removed) with a kinetic rate constant of 1.134 h−1 using an initial BPA concentration of 1.0 mg L−1. The kinetic rate constant decreased to 0.611 h−1 when the initial BPA concentration increased to 5.0 mg L−1. The initial COD concentration (400 and 2,000 mg L−1) did not affect the biodegradation kinetic of BPA.

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