scholarly journals Magnetite and Hematite in Advanced Oxidation Processes Application for Cosmetic Wastewater Treatment

Processes ◽  
2020 ◽  
Vol 8 (11) ◽  
pp. 1343 ◽  
Author(s):  
Piotr Marcinowski ◽  
Dominika Bury ◽  
Monika Krupa ◽  
Dominika Ścieżyńska ◽  
Prasanth Prabhu ◽  
...  
Keyword(s):  
Chemical Oxygen Demand ◽  
High Efficiency ◽  
Solid Phase ◽  
Oxygen Demand ◽  
Gas Chromatography Mass Spectrometry ◽  
Process Time ◽  
Toc Removal ◽  
Treatment Processes ◽  
Detection And Identification ◽  
Best Fit

Wastewater from a cosmetic factory, with an initial total organic carbon (TOC) of 146.4 mg/L, was treated with Fe2O3/Fe0/H2O2, Fe3O4/Fe0/H2O2, light/Fe2O3/Fe0/H2O2, and light/Fe3O4/Fe0/H2O2 processes. The light-supported processes were more effective than the lightless processes. The fastest TOC removal was observed during the first 15 min of the process. Out of the four tested kinetic models, the best fit was obtained for the modified second-order reaction with respect to the TOC value. The best treatment efficiency was obtained for the light/Fe3O4/Fe0/H2O2 process with 250/750 mg/L Fe3O4/Fe0 reagent doses, a 1:1 hydrogen peroxide to Chemical Oxygen Demand (H2O2/COD) mass ratio, and a 120 min process time. These conditions allowed 75.7% TOC removal to a final TOC of 35.52 mg/L and 90.5% total nitrogen removal to a final content of 4.9 mg/L. The five-day Biochemical Oxygen Demand to Chemical Oxygen Demand (BOD5/COD) ratio was increased slightly from 0.124 to 0.161. Application of Head Space Solid-Phase Microextraction Gas Chromatography Mass Spectrometry (HS-SPME-GC-MS) analysis allows for the detection and identification of 23 compounds contained in the raw wastewater. The identified compounds were eliminated during the applied process. The HS-SPME-GC-MS results confirmed the high efficiency of the treatment processes.

scholarly journals Simultaneous nitrate and organic matter removal from a dairy effluent by biodenitrification

2018 ◽  
Vol 31 (2) ◽  
pp. 97-107
Author(s):  
Ahmed Hamdani ◽  
Mohammed Mountadar ◽  
Omar Assobhei
Keyword(s):  
Organic Matter ◽  
Chemical Oxygen Demand ◽  
Electron Donor ◽  
High Efficiency ◽  
Oxygen Demand ◽  
Nitrite Accumulation ◽  
Simultaneous Removal ◽  
Optimal Conditions ◽  
Dairy Effluent ◽  
Organic Removal

In order to study the simultaneous removal of nitrate and organic matter from a dairy effluent containing 670 mg∙L-1 of nitrate (NO3--N) and 5 760 mg∙L-1 of dissolved chemical oxygen demand (CODd), denitrification in a laboratory scale bioreactor consisting of an immersed bacterial bed colonized by an heterotrophic denitrifying flora (HDF) selected for NO3- reduction, COD consumption and adapted to grow on an effluent produced by a dairy industry was investigated. The obtained results indicated that at the optimal conditions of temperature (30°C), pH (7), COD/NO3--N ratio (5), the operation lasted 108h with total reduction of nitrate in 72h, no nitrite accumulation, and 92% of soluble COD removal in 96h. This indicates that the biodenitrification was accompanied with a high efficiency of matter organic removal as an electron donor, and thereby satisfies the applicable standards.

scholarly journals Detection and Identification of Microbial Volatile Organic Compounds of the Green Mold Disease

2020 ◽  
Vol 11 (2) ◽  
pp. 14-28
Author(s):  
Dalma Radványi ◽  
András Geösel ◽  
Zsuzsa Jókai ◽  
Péter Fodor ◽  
Attila Gere
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Solid Phase ◽  
Gas Chromatography Mass Spectrometry ◽  
Identification System ◽  
Mushroom Species ◽  
Detection And Identification ◽  
Volatile Organic ◽  
Microbial Volatile Organic Compounds ◽  
Green Mould

Button mushrooms are one of the most commonly cultivated mushroom species facing different risks e.g.: viral, bacterial and fungal diseases. One of the most common problems is caused by Trichoderma aggressivum, or ‘green mould' disease. The presence or absence of mushroom disease-related moulds can sufficiently be detected from the air by headspace solid-phase microextraction coupled gas chromatography-mass spectrometry (HS SPME GC-MS) via their emitted microbial volatile organic compounds (MVOCs). In the present study, HS SPME GC-MS was used to explore the volatile secondary metabolites released by T. aggressivum f. europaeum on different nutrient-rich and -poor media. The MVOC pattern of green mould was determined, then media-dependent and independent biomarkers were also identified during metabolomic experiments. The presented results provide the basics of a green mould identification system which helps producers reducing yield loss, new directions for researchers in mapping the metabolomic pathways of T. aggressivum and new tools for policy makers in mushroom quality control.

scholarly journals Detection and Identification of Antibacterial and Antioxidant Components of Essential Oils by TLC-Biodetection and GC-MS

2016 ◽  
Vol 11 (11) ◽  
pp. 1934578X1601101 ◽  
Author(s):  
Ágnes M. Móricz ◽  
Györgyi Horváth ◽  
Andrea Böszörményi ◽  
Péter G. Ott
Keyword(s):  
Essential Oils ◽  
Solid Phase ◽  
Radical Scavenging ◽  
Gas Chromatography Mass Spectrometry ◽  
Cinnamon Bark ◽  
Scavenging Effect ◽  
Detection And Identification ◽  
Radical Scavenging Effect ◽  
Direct Bioautography ◽  
Layer Chromatography

Components of cinnamon bark, rosemary, clove and thyme essential oils were screened for antioxidant and antibacterial activity utilizing thin-layer chromatography (TLC) coupled with the DPPH• test and direct bioautography using Bacillus subtilis cells. The compounds in the active chromatographic zones were identified by solid-phase microextraction-gas chromatography-mass spectrometry (SPME-GC-MS) after their elution. Seven antibacterial components were found: cinnamaldehyde and eugenol in cinnamon bark oil, 1,8-cineole, camphor, borneol and α-terpineol in rosemary oil, eugenol in clove oil and thymol in thyme oil. Only two of them, thymol and eugenol displayed a free radical scavenging effect.

scholarly journals Minor Volatile Compounds in White Wines from Canary Islands, Madeira, and Pico (Azores) by Headspace Solid-Phase Microextraction-Gas Chromatography-Mass Spectrometry: A Qualitative Study

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
S. J. Pérez-Olivero ◽  
J. P. Pérez Trujillo ◽  
J. E. Conde
Keyword(s):  
Volatile Compounds ◽  
Canary Islands ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Gas Chromatography Mass Spectrometry ◽  
White Wines ◽  
Headspace Solid Phase Microextraction ◽  
Detection And Identification ◽  
Analytical System

Application of headspace solid-phase microextraction (HS-SPME) coupled with high-resolution gas chromatographic (HRGC) analytical system was studied for detection and identification of volatile compounds in wines. Four different SPME fibers were tested, and 138 different compounds were detected and identified. The best fiber for the determination of different groups of compounds was selected. Using these results, a comparative study of Madeira, Tenerife (Canary Islands), and Pico (Azores) was carried out.

scholarly journals Application of electrochemically synthesized ferrate(VI) in the purification of wastewater from coal separation plant

2010 ◽  
Vol 64 (5) ◽  
pp. 423-430 ◽  
Author(s):  
Milan Cekerevac ◽  
Ljiljana Nikolic-Bujanovic ◽  
Marko Mirkovic ◽  
Negica Popovic
Keyword(s):  
Chemical Oxygen Demand ◽  
High Efficiency ◽  
Anaerobic Bacteria ◽  
Oxygen Demand ◽  
Effluent Water ◽  
Separation Plant ◽  
Laboratory Procedure ◽  
Ammonia Content ◽  
Naoh Solution

The oxidative and coagulation efficiency of Na2FeO4 solution, electrochemically generated by trans-passive anodic oxidation of electrical steel in 10M NaOH solution, is confirmed in the process of purification of heavily contaminated wastewater from coal separation plant. The decontamination efficiency is evaluated comparing the values of selected contamination parameters obtained by chemical and biochemical analysis of plant effluent water and water obtained after decontamination with ferrate(VI) solution in relatively simple laboratory procedure. The sample of 450 ml of wastewater is treated in laboratory conditions with 100cm3 solution of 1 mg dm-3 Na2FeO4 in 10M NaOH. The chemical analysis of effluent water after treatment have shown almost 3 times lower permanganate index, about 3 times lower iron content, 1.45 times lower As3+ content, 7.35 times lower ammonia content. Turbidity and chemical oxygen demand (COD) is reduced for more than 5.77and 13.4 times, respectively. The suspended and colloid matter is eliminated from effluent water after treatment with ferrate(VI) solution. Also, biochemical exploration has confirmed high efficiency of ferrate(VI) in organics and microbial elimination showing 7.1 times lower 5-days bio-chemical oxygen demand (BOD5), and total elimination of aerobic and anaerobic bacteria from effluent water. According to standards on quality of industrial wastewater effluents, it may be concluded that ferrate(VI) treatment of wastewater almost completely eliminates excess of dangerous chemicals and pathogen bacteria, with the exemption of arsenic. Thus, ferrate(VI) shows capable performance in treatment of coal separation plant wastewater.

scholarly journals Turbidity and Chemical Oxygen Demand Reduction from Pig Slurry through a Coagulation Flocculation Process

Agronomy ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2158
Author(s):  
Oumaima El bied ◽  
Mathieu Kessler ◽  
Martire Angélica Terrero ◽  
Taoufiq Fechtali ◽  
Angel Faz Cano ◽  
...  
Keyword(s):  
Chemical Oxygen Demand ◽  
High Efficiency ◽  
Design Method ◽  
Oxygen Demand ◽  
Treatment Method ◽  
Iron Chloride ◽  
Pig Slurry ◽  
Treatment Optimization ◽  
Turbidity Removal ◽  
Double Filtration

Pig slurry is considered a high-risk effluent that causes several environmental problems if it is not adequately managed and treated. White Iberian pig farms in the southeast of Spain treat their slurry in situ using separation, double filtration, decantation, and constructed wetland treatments. However, the pretreatment process does not successfully reduce solids, which leads to clogging in the constructed wetlands (CWs). The main objective of this research paper is to reduce the turbidity and chemical oxygen demand (COD) from the effluent to make it appropriate for CW treatment. Optimization of the coagulation–flocculation (CF) process using iron chloride and a cationic flocculent DKFLOCC-1598 was investigated by a central composite design method (CCD). The effects of coagulant concentration, pH, and flocculent on the COD and turbidity removal were evaluated. The best results were found using 0.024 mol L−1 iron chloride and 0.164 mL L−1 flocculent at pH 7.5, which reduced COD by 96% and delivered turbidity removal of 97%. Therefore, the results indicate the high efficiency of the treatment method in reducing the COD and suspended solids.

scholarly journals Magnetite, Hematite and Zero-Valent Iron as Co-Catalysts in Advanced Oxidation Processes Application for Cosmetic Wastewater Treatment

Catalysts ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 9
Author(s):  
Jan Bogacki ◽  
Piotr Marcinowski ◽  
Dominika Bury ◽  
Monika Krupa ◽  
Dominika Ścieżyńska ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Industrial Wastewater ◽  
Treatment Method ◽  
Mass Ratio ◽  
Order Model ◽  
Co Catalysts ◽  
Toc Removal ◽  
Treatment Processes ◽  
Detection And Identification ◽  
Kinetics Of

Background: There is a need for more effective methods of industrial wastewater treatment. Methods: Cosmetic wastewater was collected and subjected to H2O2/Fe3O4/Fe2O3/Fe0 and UV/H2O2/Fe3O4/Fe2O3/Fe0 process treatment. Results: Total organic carbon (TOC) was decreased from an initial 306.3 to 134.1 mg/L, 56.2% TOC removal, after 120 min of treatment for 1:1 H2O2/COD mass ratio and 500/500/1000 mg/L Fe3O4/Fe2O3/Fe0 catalyst doses. The application chromatographic analysis allowed for the detection and identification of pollutants present in the wastewater. Identified pollutants were removed during the treatment processes. Processes carried out at a pH greater than 3.0 were ineffective. The UV process was more effective than the lightless process. Conclusions: The applied processes are effective methods for wastewater treatment. Chromatographic results confirmed the effectiveness of the treatment method. The kinetics of the process were described by the modified second-order model. On the basis of ANOVA results, the hypothesis regarding the accuracy and reproducibility of the research was confirmed.

scholarly journals Penyisihan Kandungan Kromium Hexavalen (Cr6+) pada Limbah Hasil Analisis COD dengan Metoda Presipitasi oleh NaoH dan Ca(OH)2

2020 ◽  
Vol 4 (1) ◽  
pp. 9-13
Author(s):  
Fadli Mulyadi ◽  
Yulianti Pratama ◽  
Lina Apriyanti
Keyword(s):  
Water Quality ◽  
Activated Carbon ◽  
Chemical Oxygen Demand ◽  
Hexavalent Chromium ◽  
Removal Efficiency ◽  
High Efficiency ◽  
Oxygen Demand ◽  
Demand Analysis ◽  
Carcinogenic Effect ◽  
Laboratory Waste

ABSTRAKLimbah cair laboratorium pegujian kualitas air merupakan buangan limbah yang berasal dari kegiatan pengujian kualitas air di laboratorium. Salah satu limbah cair laboratorium yang mengandung Cr6+ adalah limbah cair dari hasil pengujian COD (Chemical Oxygen Demand) yang berpotensi mencemari lingkungan karena bersifat karsinogenik. Sehingga dilakukan penelitian untuk mengetahui efisiensi penyisihan Cr6+ pada limbah cair melalui proses presipitasi dengan penggunaan bahan yang minimum dan ekonomis serta efisien. Variasi terhadap jenis dan konsentrasi presipitan yang digunakan pada penelitian ini adalah NaOH dan Ca(OH)2 dengan nilai konsentrasi 50% serta variasi pH yaitu 8; 9; 10; 11. Hasil penelitian diperoleh efisiensi penyisihan Cr6+ pada proses presipitasi sebesar 44,93% pada variasi jenis presipitan Ca(OH)2 dengan konsentrasi 50% serta pada kondisi pH 8,23.Kata kunci: Limbah COD, Kromium Heksavalen, Presipitasi, Adsorpsi, Efisiensi Penyisihan, Karbon Aktif GranularABSTRACTLiquid laboratory waste generated from water quality examination activities especially from the COD (Chemical Oxygen Demand) analysis contains Cr6+ which potentially pollute the environment due to its carcinogenic effect. The research aimed to determine the removal efficiency of Cr6+ treated by precipitation with a minimum amount of precipitate and high efficiency. In this research, variations of pH were made at constant NaOH and Ca(OH)2 concentrations of 50% while pH levels were adjusted to be 8; 9; 10; 11, respectively. Results showed that the highest Cr6+ removal of 44,93% was obtained by Ca(OH)2 50% with the pH adjusted at 8,23.Keywords: COD contained wastewater, Hexavalent Chromium, Precipitation, Adsorption, Granular Activated Carbon.

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