scholarly journals Cosmetic wastewater primary treatment by fenton process and final polishing adsorption

2020 ◽  
Vol 24 ◽  
pp. 13
Author(s):  
Lisiée Manzoli Gonçalves Pereira ◽  
Maria Eugênia de Oliveira Ferreira ◽  
Núbia Natália de Brito ◽  
Indianara Conceição Ostroski
Keyword(s):  
Contact Time ◽  
Removal Rate ◽  
Oxygen Demand ◽  
Environmental Parameters ◽  
Primary Treatment ◽  
Total Iron ◽  
Fenton Process ◽  
Ph Values ◽  
Treatment Technologies ◽  
Maximum Removal

This work aimed to integrate two wastewater treatment technologies, Fenton process as the primary treatment and adsorption aiming achieve maximum removal efficiency and adequation to the environmental and water legislations. Wastewater from a cosmetics industry plant in the metropolitan area of Goiânia (Brazil) was the object of this research. It was analysed environmental parameters as absorbance, total iron, chemical oxygen demand, pH, total phenols, conductivity, H2O2, dissolved oxygen, turbidity, and total solids. They were analyzed in between processes at all stages.  The effects of Fe2+ (18.42-257.89 mg L-1) and H2O2 (500-2300 mg L-1) concentrations and pH values (3.00-5.50) were studied for the Fenton process treatment. In adsorption, the activated carbon was characterized by infrared spectroscopy, elemental analysis, adsorption and desorption of N2 and thermogravimetry (TG/DTA). The effect of the contact time (4min-24h) and of the temperature variation in the system 20-60 °C were studied. By integrating the two technologies, a satisfactory removal rate was achieved for the analyzed parameters in the total time of treatment of 82 minutes

Adsorption of Sn (II) from Aqueous Solutions on Expanded Graphite

2011 ◽  
Vol 347-353 ◽  
pp. 89-93
Author(s):  
Ming Yang ◽  
Ying Hua Zhao ◽  
Ying Chen Zhang ◽  
Deng Xin Li
Keyword(s):  
Aqueous Solution ◽  
Microwave Irradiation ◽  
Aqueous Solutions ◽  
Contact Time ◽  
Removal Rate ◽  
Expanded Graphite ◽  
Adsorption Behavior ◽  
Adsorption Quantity ◽  
Maximum Removal

Expanded graphite (EG) was prepared by microwave irradiation at 1000 w for 60 s. It is a novel adsorbent for Sn (Ⅱ) adsorption. This paper aims to investigate the effect of the adsorption of EG. The adsorption behavior of Sn (Ⅱ) from aqueous solution onto EG was investigated with variety of parameters such as pH, adsorbents dosage, initial Sn (Ⅱ) concentration, contact time and temperature. On conditions that the pH was 2.5, the dosage of adsorbent was 0.02 g, the concentration of Sn (Ⅱ) was 200 mg/L and the temperature was 15°C, the maximum removal rate can reach to 98.32%, and the adsorption quantity can reach to 245.7985 mg•g-1. The results showed that the EG was an efficient and novel adsorbent for the removal of stannum from aqueous solution.

scholarly journals Performance and Microbial Community of Different Biofilm Membrane Bioreactors Treating Antibiotic-Containing Synthetic Mariculture Wastewater

Membranes ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 282
Author(s):  
Huining Zhang ◽  
Xin Yuan ◽  
Hanqing Wang ◽  
Shuoqi Ma ◽  
Bixiao Ji
Keyword(s):  
Microbial Community ◽  
Membrane Fouling ◽  
High Throughput Sequencing ◽  
Removal Rate ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Membrane Bioreactors ◽  
Resistant Bacteria ◽  
Fouling Mitigation ◽  
Maximum Removal

The performance of pollutant removals, tetracycline (TC) and norfloxacin (NOR) removals, membrane fouling mitigation and the microbial community of three Anoxic/Oxic membrane bioreactors (AO-MBRs), including a moving bed biofilm MBR (MBRa), a fixed biofilm MBR (MBRb) and an AO-MBR (MBRc) for control, were compared in treating antibiotic-containing synthetic mariculture wastewater. The results showed that MBRb had the best effect on antibiotic removal and membrane fouling mitigation compared to the other two bioreactors. The maximum removal rate of TC reached 91.65% and the maximum removal rate of NOR reached 45.46% in MBRb. The addition of antibiotics had little effect on the removal of chemical oxygen demand (COD) and ammonia nitrogen (NH4+-N)—both maintained more than 90% removal rate during the entire operation. High-throughput sequencing demonstrated that TC and NOR resulted in a significant decrease in the microbial diversity and the microbial richness MBRs. Flavobacteriia, Firmicutes and Azoarcus, regarded as drug-resistant bacteria, might play a crucial part in the removal of antibiotics. In addition, the dynamics of microbial community had a great change, which included the accumulation of resistant microorganisms and the gradual reduction or disappearance of other microorganisms under antibiotic pressure. The research provides an insight into the antibiotic-containing mariculture wastewater treatment and has certain reference value.

Adsorption of Pb (II) from Aqueous Solutions on Expanded Graphite

2011 ◽  
Vol 361-363 ◽  
pp. 55-58
Author(s):  
Ying Hua Zhao ◽  
Jin Hui Dong ◽  
Ying Chen Zhang ◽  
Min Cong Zhu ◽  
Deng Xin Li
Keyword(s):  
Aqueous Solution ◽  
Microwave Irradiation ◽  
Aqueous Solutions ◽  
Electron Micrographs ◽  
Contact Time ◽  
Removal Rate ◽  
Expanded Graphite ◽  
Scanning Electron Micrographs ◽  
Scanning Electron ◽  
Maximum Removal

Expanded graphite (EG) was prepared by microwave irradiation at 1000 w for 60 s. It is a novel adsorbent for Pb (Ⅱ) adsorption. This paper aims to investigate the effect of the adsorption of EG. The adsorption behavior of Pb (Ⅱ) from aqueous solution onto EG was investigated with variety of parameters such as pH, adsorbents dosage, initial Pb (Ⅱ) concentration, contact time and temperature. On conditions that the pH=6.04,the dosage of adsorbent was 0.075g, the concentration of Pb(Ⅱ) was 100mg/L and the temperature was 15°C, the maximum removal rate could reach at 86.55% .The results showed that the EG was an efficient and novel adsorbent for the removal of lead from aqueous solution. The microstructures of the resultant expanded graphite were observed by scanning electron micrographs.

scholarly journals Removal of Reactive Blue 19 Dye Using Fenton From Aqueous Solution

2018 ◽  
Vol 5 (1) ◽  
pp. 50-55 ◽  
Author(s):  
Fahimeh Moghadam ◽  
Najmeh Nori Kohbanan
Keyword(s):  
Aqueous Solution ◽  
Removal Efficiency ◽  
Contact Time ◽  
Reactive Dyes ◽  
Oxygen Demand ◽  
Fenton Process ◽  
Fenton Reagent ◽  
Reactive Blue 19 ◽  
Living Organisms ◽  
Adsorption Rates

The discharge of wastewater containing reactive dyes into water sources leads to health hazards. Colors can adversely affect the natural environment due largely to some qualities like carcinogenicity, being mutagenic, toxicity, and coloration of water. Environmental degradation can be attributed to the destruction of living organisms and the increased biological oxygen demand (BOD). The aim of this study was to evaluate the removal of Reactive Blue 19 dye using the Fenton process from aqueous solution. This research was an experimental study, in which the effectiveness of Fenton in color removal was investigated. The factors influencing this process were: pH, color concentration, the ratio of Fenton reagent (H2O2/Fe2+), and contact time. Finally, after determining the optimum concentration of color, pH, the ratio of Fenton reagent, and contact time, the residual adsorption rates in the samples were measured using direct photometry by spectrophotometer in a wavelength of 594 nm. The results showed that the highest removal efficiency was obtained under the conditions of pH =3, the color concentration of 2 mg/L, the ratio of Fenton reagent = 1:5, and the contact time equal to 10 minutes. The Fenton process is able to remove the Reactive Blue 19 under different concentrations. This process achieved the best removal efficiency in acidic pH.

scholarly journals A STUDY OF THE REMOVE CATIONIC AND ANIONIC DYES IN AQUEOUS SOLUTION BY A NEW NATURAL CLAY

2020 ◽  
Vol 5 (10) ◽  
pp. 64-74
Author(s):  
Malika Tamimi ◽  
Nadia Bougdour ◽  
Said Alahaine ◽  
Asma Sennaoui ◽  
Ali Assabbane
Keyword(s):  
Contact Time ◽  
Removal Rate ◽  
Natural Clay ◽  
Reaction Parameter ◽  
Reaction Parameters ◽  
Anionic Dyes ◽  
Good Efficiency ◽  
Kinetics Of Adsorption ◽  
Kinetics Of ◽  
Maximum Removal

The objective of this work is to study the possibility of eliminating both dyes Methylene Blue (MB) and Congo Red (CR) by adsorption on natural clay of the region of Agadir and determine the different reaction parameters effect on the proceeds. Orientation tests have been carried out in distilled water solutions. The results of the kinetics of adsorption showed that optimal contact time is 60 min; it corresponds to a maximum removal rate of MB and CR respectively of the order of 99% and 75%. Increased adsorbent ratio (0,1 à 2 g / l) improves the removal efficiency of the CR especially dyes for an initial concentration of 10 mg/l. NaNO3 salt and pH of the medium greatly influence the CR of retention. Whatever the reaction parameter tested; it appears that the clay has a good efficiency for the retention of two dyes.

scholarly journals Tartrazine Removal from Aqueous Solution by HDTMA-Br-Modified Colombian Bentonite

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Ronald A. Otavo-Loaiza ◽  
Nancy R. Sanabria-González ◽  
Gloria I. Giraldo-Gómez
Keyword(s):  
Aqueous Solution ◽  
Contact Time ◽  
Industrial Wastewater ◽  
Maximum Adsorption Capacity ◽  
Sunset Yellow ◽  
Anionic Dyes ◽  
Ph Values ◽  
Nacl Concentration ◽  
Langmuir And Freundlich Models ◽  
Maximum Removal

The effect of pH, ionic strength (NaCl added), agitation speed, adsorbent mass, and contact time on the removal of tartrazine from an aqueous solution, using an organobentonite, has been studied. A complete factorial design 32 with two replicates was used to evaluate the influence of the dye concentration (30, 40, and 50 mg/L) and amount of adsorbent (25, 35, and 45 mg) on decolorization of the solution. Experimental data were evaluated with Design Expert® software using a response surface methodology (RSM) in order to obtain the interaction between the processed variables and the response. pH values between 2 and 9, stirring speed above 200 rpm, and contact time of 60 min did not have a significant effect on decolorization. The optimum conditions for maximum removal of tartrazine from an aqueous solution of 30 mg/L were follows: pH = 6.0, NaCl concentration = 0.1 M, stirring speed = 230 rpm, temperature = 20°C, contact time = 60 min, and the organobentonite amount = 38.04 mg. The equilibrium isotherm at 20°C was analyzed by means of the Langmuir and Freundlich models, and the maximum adsorption capacity obtained was 40.79 ± 0.71 mg/g. This adsorption process was applied in a sample of industrial wastewater containing tartrazine and sunset yellow, having obtained a decolorization rate higher than 98% for both dyes. These results suggest that organobentonite is an effective adsorbent for the removal of anionic dyes from an aqueous solution.

Optimization of Fenton process for decoloration and COD removal in tobacco wastewater and toxicological evaluation of the effluent

2011 ◽  
Vol 63 (11) ◽  
pp. 2471-2477 ◽  
Author(s):  
Meizhen Wang ◽  
Guiqin Yang ◽  
Huajun Feng ◽  
Zhenmei Lv ◽  
Hang Min
Keyword(s):  
High Efficiency ◽  
Removal Rate ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Fenton Process ◽  
Toxicological Evaluation ◽  
Hydroxyl Free Radical ◽  
Safe Strategy ◽  
Tobacco Wastewater ◽  
Cod Removal Rate

Decoloration and chemical oxygen demand (COD) removal in tobacco wastewater by Fenton process has been optimized under 25 ± 2 °C. The results showed that the optimal range of conditions were pH 4.13–4.66, Fe2+ 0.29–0.34 g/L and H2O2 ≥ 2.73 g/L. Within this range, up to 95% of colour and 90% of COD was removed. In an enlarged system, setting the optimal conditions as pH 4.50, Fe2+ 0.34 g/L and H2O2 4.00 g/L, the colour removal rate was 96.03 ± 2.57%, with COD removal rate of 93.30 ± 2.92%. The residual COD of 73.67 ± 19.70 mg/L in effluent had hit the State's first-class standard for the industrial discharge in China (<100 mg/L COD, GB8978-1996). The ecological safety of Fenton process has also been evaluated. When reaction completed, the content of hydroxyl free radical (·OH) was 3.26 ± 0.44 mg/L. There was no inhibition of Fenton effluent in growth of Escherichia coli, Pseudomonas putida, Pseudomonas sp. HF-1, Acinetobacter sp. TW and Sphingomonas sp. TY. No oxidative stress was induced on strain HF-1 by Fenton effluent. Thus, Fenton process was one of high-efficiency and ecologically safe strategy for tobacco wastewater advanced treatment.

The Malachite Green Biodegradation in Bioreactors on Various pH Domains

2019 ◽  
Vol 70 (8) ◽  
pp. 2996-2999
Author(s):  
Viorel Gheorghe ◽  
Catalina Gabriela Gheorghe ◽  
Andreea Bondarev ◽  
Vasile Matei ◽  
Mihaela Bombos
Keyword(s):  
Malachite Green ◽  
Contact Time ◽  
Dominant Species ◽  
Wastewater Treatment Plants ◽  
Organic Substances ◽  
Biological Degradation ◽  
Growth Promoters ◽  
Ph Values ◽  
Biological Sludge ◽  
Ph Range

In the experimental study was studied the malachite green colorant biodegradation in biological sludge with biological activity. The biodegradability tests were carried out in laboratory bioreactors, on aqueous solutions of green malachite contacted with microorganisms in which the dominant species is Paramecium caudatum, in a pH range between 8 and 12, temperatures in the ranges 25-350C, using pH neutralizing substances and biomass growth promoters. The colorant initial concentrations and those obtained after biological degradation depending on the contact time, at certain pH values, were established through UV-Vis spectrometry. The studies have shown the measure of possible biological degradation of some organic substances with extended uses, with largely aromatic structure, resistance to biodegradation of microorganisms, commonly used in wastewater treatment plants.

scholarly journals Microbial Removal of Pb(II) Using an Upflow Anaerobic Sludge Blanket (UASB) Reactor

Catalysts ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 512
Author(s):  
Jeremiah Chimhundi ◽  
Carla Hörstmann ◽  
Evans M. N. Chirwa ◽  
Hendrik G. Brink
Keyword(s):  
Treatment Process ◽  
Removal Rate ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Reduction Potentials ◽  
Oxidation Reduction ◽  
Anaerobic Sludge Blanket ◽  
Microbial Removal ◽  
Maximum Removal

The main objective of this study was to achieve the continuous biorecovery and bioreduction of Pb(II) using an industrially obtained consortia as a biocatalyst. An upflow anaerobic sludge blanket reactor was used in the treatment process. The bioremediation technique that was applied made use of a yeast extract as the microbial substrate and Pb(NO3)2 as the source of Pb(II). The UASB reactor exhibited removal efficiencies of between 90 and 100% for the inlet Pb concentrations from 80 to 2000 ppm and a maximum removal rate of 1948.4 mg/(L·d) was measured. XRD and XPS analyses of the precipitate revealed the presence of Pb0, PbO, PbS and PbSO4. Supporting experimental work carried out included growth measurements, pH, oxidation–reduction potentials and nitrate levels.

scholarly journals Application of Ozone and Oxygen to Reduce Chemical Oxygen Demand and Hydrogen Sulfide from a Recovered Paper Processing Plant

2010 ◽  
Vol 2010 ◽  
pp. 1-6 ◽  
Author(s):  
Patricia A. Terry
Keyword(s):  
Hydrogen Sulfide ◽  
Chemical Oxygen Demand ◽  
Contact Time ◽  
Oxygen Demand ◽  
Gas Production ◽  
Injection System ◽  
Processing Plant ◽  
Short Contact Time ◽  
Production Of Hydrogen ◽  
Fox River

A pilot study was performed at the Fox River Fiber recovered paper processing company in DePere, Wisconsin, to determine the extent to which injection of oxygen and ozone could reduce the high chemical oxygen demand, COD, in the effluent and the effectiveness of the ozone/oxygen stream in suppressing production of hydrogen sulfide gas in downstream sewage lines. Adaptive Ozone Solutions, LLC, supplied the oxygen/ozone generation and injection system. Samples were analyzed both before and after oxygen/ozone injection. Hydrogen sulfide gas was continuously monitored at sewer stations downstream of Fox River Fiber. Results showed that with a very short contact time, effluent COD was reduced by over 15%. A simple kinetic model predicts that a contact time of fewer than 30 minutes could reduce COD by as much as 60%. In addition, downstream hydrogen sulfide gas production in the sewage mains was also better controlled, such that costly Bioxide applications could be reduced.

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