scholarly journals Investigation on the Efficiency of Modified Fenton on the Treatment of Leachate Generated From Oily Sludge Composting

2021 ◽  
Vol 24 (3) ◽  
pp. 224-333
Author(s):  
Ali Koolivand ◽  
◽  
Parisa Rastgordani ◽  
Emad Mohammadtalebi ◽  
◽  
...  
Keyword(s):  
Oil Sludge ◽  
Optimal Time ◽  
Oily Sludge ◽  
Fenton Process ◽  
Medical Sciences ◽  
Ethical Considerations ◽  
Initial Concentration ◽  
Time Parameters ◽  
Modified Fenton ◽  
Sludge Composting

Background: and Aim The leachate from oil sludge compost into the environment, which is resistant to decomposition, causes several environmental problems. Therefore, it needs to be treated using efficient processes. This study aimed to investigate the efficiency of the modified Fenton process for treating these oil sludge leachates. Methods & Materials: In this experimental study, leachate samples were collected, and then modified Fenton solution was prepared by adding Fe2 (SO4) 3 to H2O2. Then the effect of time parameters (15, 30, 60, 90, and 120 minutes), modified Fenton concentration of 20, 50, 100, and 200 mg/l with pH 3, 5, 9, and three initial concentration of COD (500, 1000 and 1500 mg/l) was examined. Ethical Considerations: This study has been registered in Arak University of Medical Sciences with codes 2645 and 2765. Results: The reduction of COD and TPH in the optimal time of 60 minutes, initial COD of 500 mg/l, pH of 3, and Fenton concentration of 200 mg/l were 9.04 and 77.42%, respectively. The experiments showed that the removal efficiency of COD and TPH with increasing residence time and the concentration of modified Fenton are directly proportional and with decreasing, the initial concentration of COD and pH is inversely proportional. Conclusion: The use of modified Fenton is an efficient method for treating leachate from petroleum sludge compo

Preparation and Compressive Strength Evaluation of Concrete Containing Oil Sludge as Additive

2018 ◽  
Vol 930 ◽  
pp. 148-152 ◽  
Author(s):  
Antonio S. Araujo ◽  
Ana C.F. Coriolano ◽  
Rafaely A.F. Bandeira ◽  
Regina C.O.B. Delgado
Keyword(s):  
Compressive Strength ◽  
Room Temperature ◽  
Positive Response ◽  
Load Capacity ◽  
Oil Sludge ◽  
Oily Sludge ◽  
New Materials ◽  
Water Factor ◽  
Strength Tests ◽  
Concrete Blocks

Concretes were prepared containing oil sludge additive to produce new materials for construction. The oil sludge and concrete have previously been characterized in terms of chemical composition of the elements present in the materials. The concrete blocks were produced with a defined amount of oily sludge of 3.0 mass% on cement/water factor. All samples were cured at room temperature and then heated at 200 °C for 3 hours and 292 °C for 2h. The surfaces of the samples were subjected to previously grinding for the compressive strength testing. These tests were conducted in a press of 2000 kN load capacity. It was found that concrete containing additive showed a positive response in all the compressive strength tests, compared to concrete without the additive

scholarly journals Efficient H2O2 generation and electro-Fenton degradation of pollutants in microchannels of oxidized monolithic-porous-carbon cathode

2019 ◽  
Vol 80 (5) ◽  
pp. 970-978
Author(s):  
Yunfei Guo ◽  
Shuai Wu ◽  
Hongtao Yu ◽  
Shuo Chen ◽  
Chunna Wang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Organic Pollutants ◽  
Porous Carbon ◽  
Hydraulic Retention Time ◽  
Fenton Process ◽  
Initial Concentration ◽  
H2o2 Generation ◽  
Flow Through ◽  
Fenton System ◽  
Degradation Of Pollutants

Abstract A monolithic-porous carbon (MPC) was fabricated by carbonizing a pine rod, and then the oxidized monolithic-porous carbon (O-MPC) was obtained via alkaline heat treatment of MPC. With well-ordered axial channels (diameters were 6–14 μm and 40–50 μm) and oxygen-containing functional groups, O-MPC as a flow-through cathode exhibited good capability in continuously generating H2O2 (422 μmol/L) via oxygen reduction. O-MPC and additional Fe2+ composed an electro-Fenton system and the performance of the system in degradation of organic pollutants was evaluated. For phenol, bisphenol A or sulfamethoxazole at initial concentration of 10 mg/L the removal efficiency reached 74%–82% in a hydraulic retention time of 100 seconds, nearly close to that of the homogeneous Fenton process (90%). This efficiency may be maintained for at least 10 hours, indicating a good stability of O-MPC. The results demonstrate the potential of O-MPC as a flow-through electrode to realize homogeneous-like degradation of organic pollutants in wastewater.

scholarly journals Bioinformatics Prediction of miRNAs Targeting E6 and E7 Genes in Human Papillomavirus Types 16 and 18 in Cervical Cancer

2020 ◽  
Vol 23 (3) ◽  
pp. 374-385
Author(s):  
Tahere Azimi ◽  
◽  
Malihe Bagheri ◽  
Mahdi Pariyan ◽  
Behzad Khansarinejad ◽  
...  
Keyword(s):  
Cervical Cancer ◽  
Human Papillomavirus ◽  
Early Stage ◽  
Medical Sciences ◽  
Ethical Considerations ◽  
E7 Gene ◽  
Bioinformatics Databases ◽  
E6 And E7 ◽  
New Biomarkers

Background and Aim: Cervical Cancer (CC) is the third most common malignancy in the women, the main cause of which is human papillomavirus (HPV). Both E6 and E7 oncogenes of the virus play an important role in its tumorigenesis. Today, methods available for screening CC are not capable of detecting the disease at an early stage. Therefore, it is important to identify new biomarkers for early detection of this cancer. For this purpose, in the present study, miRNAs targeting the two oncogenes E6 and E7 of human papillomavirus (types 16 and 18) were studied in CC by bioinformatics. Methods & Materials: First, using the NCBI database, the E6 and E7 gene sequences were obtained for both human papillomavirus types 16 and 18. Then, using the miRBase and RNA22 bioinformatics databases, the most appropriate targeting miRNAs for these genes were selected. Ethical Considerations: This study was approved by Ethics Committee of Arak University of Medical Sciences. Results: Based on the P obtained from bioinformatics databases, miRNA including miR-92a-5p (P=7.51e-2), miR-195-3p (P=2.24e-1), miR-34a-5p (P=2.73e-1) and miR-155-5p (P=4.95e-2) were introduced for the two genes E6 and E7. Conclusion: Results from bioinformatics studies revealed that of the four miRNAs identified, miR-155-5p and miR-92a-5p are probably the targeting miRNAs specific for the E6 and E7 genes, respectively. Therefore, it seems that these miRNAs can be a suitable candidate for in vitro studies in CC patients.

scholarly journals ESTIMATION OF THE EFFICIENCY OF MECHANICAL ACTIVATION OF SILICA-CONTAINING ROCKS

2021 ◽  
Vol 6 (5) ◽  
pp. 19-27
Author(s):  
A. Shamanina ◽  
Arkadiy Ayzenshtadt ◽  
V. Kononova ◽  
V. Danilov
Keyword(s):  
Mechanical Activation ◽  
Surface Activity ◽  
Raw Materials ◽  
Functional Dependence ◽  
Construction Materials ◽  
Mineralogical Composition ◽  
Optimal Time ◽  
Energy Potential ◽  
Mineral Components ◽  
Time Parameters

Rocks of various chemical and mineralogical composition are widely used as raw materials in the construction materials industry. At the same time, preliminary mechanical activation of mineral raw materials to a finely dispersed state contributes to a change in the energy potential of the system and affects the tendency of the surface of a finely dispersed system to transformations. Studies of the physicochemical activity of mechanically activated rocks allow to determine the rational areas of use of mineral components. The paper presents the results of evaluating the efficiency of mechanical activation of silica-containing raw materials by the values of surface activity (ks), defined as the ratio of the value of the free surface energy to the specific mass energy of atomization. Fine powders are obtained by grinding in a planetary ball mill to a different specific surface area of quartz sand (1200 – 3000 m2/kg) and polymineral sand (700 – 1335 m2/kg). The presence of a functional dependence of the surface activity on the time parameters of mechanical activation of the studied rocks is shown. The mechanical activation of the feedstock at the optimal time of its grinding makes it possible to achieve a given value of the surface activity. It is recommended to use the ks parameter as a criterion for assessing the efficiency of the process of mechanical activation of silica-containing rocks

scholarly journals Enhanced treatment of 2-methylpropane-2-thiol contaminated soil using magno-modified fenton process

2020 ◽  
Vol 26 (1) ◽  
pp. 9-20
Author(s):  
Pejman Roohi ◽  
Esmaeil Fatehifar
Keyword(s):  
Magnetic Field ◽  
Removal Efficiency ◽  
Field Intensity ◽  
Magnetic Field Intensity ◽  
Maximum Level ◽  
Organosulfur Compounds ◽  
Fenton Process ◽  
Positive Role ◽  
Contaminant Remediation ◽  
Modified Fenton

In this work, the nano-magno-modified Fenton process for remediation of soil polluted with 2-methylpropane-2-thiol is investigated. In this two-step oxidation process, a nanocatalyst system is used, including Fe2+/Fe3+ coupled with ethanol solvent exposed to the magnetic field. The data analysis resulting from analysis of variance shows that H2O2, NaOH, Fe3O4 nanoparticle and ethanol concentration with magnetic field intensity are effective on 2-methylpropane-2- -thiol removal efficiency (26.99, 4.36, 3.42, 17.63 and 8.66%, respectively). Moreover, H2O2/nanoFe3O4 and NaOH/nanoFe3O4 were the influencing interaction with a positive role and nanoFe3O4/ethanol, H2O2/NaOH and magnetic field/nanoFe3O4 with a negative role. The maximum level of initial H2O2 concentration, a minimum level of ethanol and certain levels of NaOH initial concentration (8.64 mass%), Fe3O4 nanoparticles to soil ratio and magnetic field intensity (0.11 mass% w/w and 3585 Oe, respectively) were suggested for the maximum contaminant remediation efficiency in the studied interval (%R = = 92.02). The magno-modified Fenton process could be used for both, increasing the removal efficiency and minimizing the vaporization of similar organosulfur compounds. Experimental results show that the solvent addition for diluting thiol contaminant could reduce the removal efficiency while the coupling of Fe3O4 and magnetic field is a good way of separation and reuse to solve the recovery problem of the nanoparticles.

Degradation of safranin by heterogeneous Fenton processes using peanut shell ash based catalyst

2019 ◽  
Vol 79 (7) ◽  
pp. 1367-1375
Author(s):  
Amir Ikhlaq ◽  
Hafiza Zara Anwar ◽  
Farhan Javed ◽  
Saba Gull
Keyword(s):  
Research Work ◽  
Agitation Speed ◽  
Peanut Shell ◽  
H2o2 Concentration ◽  
Fenton Process ◽  
Heterogeneous Fenton ◽  
Initial Concentration ◽  
Industrial Sectors ◽  
Efficient Performance ◽  
Maximum Decolorization

Abstract Today, dyes are one of the major problematic pollutants in the environment and are broadly used in several industrial sectors. In the current research work, decolorization of safranin (basic dye) from aqueous solution was investigated using iron-impregnated peanut shell ash (Fe-PSA) as a catalyst in the UV-assisted heterogeneous Fenton process (Fe-PSA/H2O2/UV). The effect of parameters such as H2O2 concentration, catalyst dose, pH, initial dye concentration, temperature, and agitation speed was studied. The maximum decolorization of safranin was achieved at optimum parametric values of reagent dose = 8 mM, catalyst dose = 0.5 g, pH = 3, initial concentration of safranin = 50 ppm, temperature = 25 °C, and agitation speed = 200 rpm. The results revealed the efficient performance of Fe-PSA as catalyst in the Fe-PSA/H2O2/UV process for safranin treatment.

Experimental Study on Ultrasonic Dehydration of Oily Sludge

2013 ◽  
Vol 726-731 ◽  
pp. 1855-1858
Author(s):  
Fang Li ◽  
Zhong Yan Chen ◽  
Zeng Lv Qi ◽  
Hong Mei Cui
Keyword(s):  
Experimental Study ◽  
Oil Sludge ◽  
Oily Sludge ◽  
Subsequent Processing ◽  
Ultrasonic Technology ◽  
Ultrasonic Time ◽  
Economical Benefit ◽  
Oil Concentration

Experiments were operated for the purposes of dewatering oily sludge and reducing sludge volume with ultrasonic technology. The effect of clay dosage, temperature, ultrasonic time and emulsifier dosage were assessed respectively. The result shows that: when the temperature is 40°C, ultrasonic time is 20min; demulsifier dosage is 15ml and clay dosage is 15g, 500ml volume of oily sludge decreased to 40ml. Oil concentration is up to 158.45mg/l in 460ml separation fluid. This method may obtain the economical benefit and be feasible in technology. Treating oily sludge with ultrasonic technology is good at the subsequent processing of oil sludge.

Application of a Fenton process for the pretreatment of an iron-containing oily sludge: A sustainable management for refinery wastes

2022 ◽  
Vol 304 ◽  
pp. 114244
Author(s):  
S. Jerez ◽  
M. Ventura ◽  
R. Molina ◽  
F. Martínez ◽  
M.I. Pariente ◽  
...  
Keyword(s):  
Sustainable Management ◽  
Oily Sludge ◽  
Fenton Process ◽  
Refinery Wastes
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