scholarly journals Application of UV/TiO2 Advanced Oxidation in Treating Oily Compost Leachate Generated During Oily Sludge Composting

2019 ◽  
Vol 29 (3) ◽  
pp. 241-251 ◽  
Author(s):  
Reza Tajik ◽  
Kazem Godini ◽  
Reza Saeedi ◽  
Masoumeh Mashayekhi ◽  
Ali Koolivand
Keyword(s):  
Reaction Time ◽  
Chemical Oxygen Demand ◽  
Petroleum Hydrocarbons ◽  
Oxygen Demand ◽  
Total Petroleum Hydrocarbons ◽  
Oily Sludge ◽  
Optimal Conditions ◽  
Compost Leachate ◽  
Uv C ◽  
Sludge Composting

Abstract In this work, oily compost leachate (OCL) generated during oily sludge composting was treated by UV/TiO2. OCL subsamples, gathered bi-weekly from the composting process, were thoroughly mixed and then filtered to reduce the solution turbidity. The effects of initial chemical oxygen demand (COD) concentration, UV type (A and C), pH (3, 7, and 11), reaction time (30, 60, 90, and 120 min), and TiO2 concentration (0.5, 1, and 2 g L−1) on the total petroleum hydrocarbons (TPH) and COD removal from OLC were examined. The results showed that the efficiency of the process improved with the increase in TiO2 concentration and reaction time and the decrease in pH and pollutant concentration. In the optimal conditions (UV-C, TiO2 concentration of 1 mg L−1, reaction time of 90 min, and pH of 3), 52.29% of TPH was removed. Moreover, 36.69 and 48.3% of TPH was reduced by UV-A/TiO2 and UV-C/TiO2, respectively in real conditions of OCL (pH = 6.3, COD = 1501. 24 mg L−1, and TPH = 170.12 mg L−1) during the 90 min reaction time. The study verified that UV/TiO2 has the potential to be applied to treat OCL.

The fate of total petroleum hydrocarbons during oily sludge composting: a critical review

2019 ◽  
Vol 18 (3) ◽  
pp. 473-493 ◽  
Author(s):  
Anas Aguelmous ◽  
Loubna El Fels ◽  
Salah Souabi ◽  
Mohamed Zamama ◽  
Mohamed Hafidi
Keyword(s):  
Critical Review ◽  
Petroleum Hydrocarbons ◽  
Total Petroleum Hydrocarbons ◽  
Oily Sludge ◽  
Sludge Composting

Assessment of the Effects of Combined Fe/C Microelectrolysis–Electro-Fenton on the Acrylonitrile Removal from Analogue Wastewater

2012 ◽  
Vol 610-613 ◽  
pp. 2323-2327 ◽  
Author(s):  
Ming Zhong Hu ◽  
Zhong Hao Shen
Keyword(s):  
Reaction Time ◽  
Chemical Oxygen Demand ◽  
Process Parameters ◽  
Active Carbon ◽  
Ph Value ◽  
Electrochemical Reaction ◽  
Oxygen Demand ◽  
Optimal Conditions ◽  
Optimization Parameters ◽  
Percentage Removal

In the present work, acrylonitrile removal from analogue wastewater was investigated using the combined Fe/C microelectrolysis–electro-Fenton. The optimization parameters such as ratio of Fe/C, pH value, the reaction time, the dose of H2O2, the voltage, and the stir time on the acrylonitrile removal efficiency were determined by measuring the percentage removal of Chemical Oxygen Demand (CODcr) in the acrylonitrile analogue wastewater. In the Microelectrolysis section, the ratio of Fe/C was 1:1, the pH value was 3.0, and reaction time was 1h. In the electrolyzing Fenton, the optimal conditions of process parameters were the dose of H2O2 oxidant (5ml/L), the voltage (2.0 V), electrochemical reaction time (40min), and stir time (20min).Under the optimal conditions, the percentage removal of was 69% in first section and about 35% in the second section. Also, the dose of oxidant (H2O2) decreased from 11ml/L to 5ml/L compared with the using single active carbon method.

Humification Process and Total Petroleum Hydrocarbons Assessment During Oily Sludge Composting

2020 ◽  
Vol 11 (12) ◽  
pp. 6625-6635 ◽  
Author(s):  
Anas Aguelmous ◽  
Loubna El Fels ◽  
Salah Souabi ◽  
Mohamed Zamama ◽  
Slimane Lahsaini ◽  
...  
Keyword(s):  
Petroleum Hydrocarbons ◽  
Total Petroleum Hydrocarbons ◽  
Oily Sludge ◽  
Sludge Composting

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.

Removal of phenol from steel wastewater by combined electrocoagulation with photo-Fenton

2018 ◽  
Vol 78 (6) ◽  
pp. 1260-1267 ◽  
Author(s):  
Mohammad Malakootian ◽  
Mohammad Reza Heidari
Keyword(s):  
Reaction Time ◽  
Removal Efficiency ◽  
Current Density ◽  
Steel Industry ◽  
High Efficiency ◽  
Oxygen Demand ◽  
Optimal Conditions ◽  
Suitable Alternative ◽  
Steel Mills ◽  
Real Wastewater

Abstract Phenol and its derivatives are available in various industries such as refineries, coking plants, steel mills, drugs, pesticides, paints, plastics, explosives and herbicides industries. This substance is carcinogenic and highly toxic to humans. The purpose of the study was to investigate the removal of phenol from wastewater of the steel industry using the electrocoagulation–photo-Fenton (EC-PF) process. Phenol and chemical oxygen demand (COD) removal efficiency were investigated using the parameters pH, Fe2+/H2O2, reaction time and current density. The highest removal efficiency rates of phenol and COD were 100 and 98%, respectively, for real wastewater under optimal conditions of pH = 4, current density = 1.5 mA/cm2, Fe2+/H2O2 = 1.5 and reaction time of 25 min. Combination of the two effective methods for the removal of phenol and COD, photocatalytic electrocoagulation photo-Fenton process is a suitable alternative for the removal of organic pollutants in industry wastewater because of the low consumption of chemicals, absence of sludge and other side products, and its high efficiency.

Ultrasound-UV Method Detect Oil Content of Oily Sludge from Daqing Oilfield

2010 ◽  
Vol 113-116 ◽  
pp. 2292-2295
Author(s):  
Jie Zhang ◽  
Zhao Yang Wang ◽  
Jing Xin Sun ◽  
Li Wei ◽  
Bin Song Wang ◽  
...  
Keyword(s):  
Petroleum Hydrocarbons ◽  
Traditional Method ◽  
Oil Content ◽  
Total Petroleum Hydrocarbons ◽  
Oily Sludge ◽  
Production Plant ◽  
Liquid Ratio ◽  
Plant Oil ◽  
Standard Curve ◽  
Solid Liquid

Drained sludge of Daqing oilfield No.4 oil production plant was collected from bottoms of tanks, and the oil content was usually lower than 2%. In this paper, the contents of petroleum substances, total petroleum hydrocarbons (TPH) and animal and plant oil were investigated. Ultrasound-UV method was used to detect the oil content of oily sludge. Results showed that the best ultrasound time was 8 min and the best solid-liquid ratio for the extraction was about 1:20. The standard curve was constructed. The comparison between the ultrasound-UV method and the traditional method shows that the ultrasound-UV method is more suitable for the detection of oil content of oily sludge with lesser oil. Moreover, the methods of detecting sludge with lower oil content have been established.

scholarly journals Improved Ozonation Efficiency for Polymerization Mother Liquid from Polyvinyl Chloride Production Using Tandem Reactors

Molecules ◽  
2019 ◽  
Vol 24 (24) ◽  
pp. 4436 ◽  
Author(s):  
Zhiyong Yang ◽  
Penglei Wang ◽  
Yagang Zhang ◽  
Xingjie Zan ◽  
Wenjuan Zhu ◽  
...  
Keyword(s):  
Reaction Time ◽  
Chemical Oxygen Demand ◽  
Polyvinyl Chloride ◽  
Ozone Concentration ◽  
Degradation Rate ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Utilization Efficiency ◽  
High Ozone Concentration ◽  
In Series

Polymerization mother liquid (PML) is one of the main sources of wastewater in the chlor-alkali industry. The effective degradation of the PML produced in PVC polymerization using three or five ozone reactors in tandem was designed with a focus on improving the ozonation efficiency. The ozonation efficiency of the tandem reactors for the degradation of PML, along with the effect of ozone concentration, the number of reactors utilized in series, and the reaction time on the chemical oxygen demand (COD) removal were investigated in detail. The results showed that the COD removal increased as the ozone concentration was increased from 10.6 to 60 mg·L−1, achieving 66.4% COD removal at ozone concentration of 80.6 mg·L−1. However, when the ozone concentration was increased from 60 mg·L−1 to 80 mg·L−1, the COD removal only increased very little. The COD decreased with increasing ozone concentration. During the initial degradation period, the degradation rate was the highest at both low and high ozone concentrations. The degradation rate decreased with reaction time. The rate at a low ozone concentration decreased more significantly than at high ozone concentration. Although high ozone concentration is desirable for COD removal and degradation rate, the utilization efficiency of ozone decreased with increasing ozone concentration. The ozone utilization efficiency of the five-reactor device was three times higher than that of three tandem reactors, demonstrating that ozonation utilization efficiency can be improved by increasing the number of tandem reactors. Ozonation in tandem reactors is a promising approach for PML treatment.

Biodegradation of Total Petroleum Hydrocarbons from Oily Sludge

2011 ◽  
Vol 15 (3) ◽  
pp. 140-147 ◽  
Author(s):  
B. Srinivasarao Naik ◽  
I. M. Mishra ◽  
S. D. Bhattacharya
Keyword(s):  
Petroleum Hydrocarbons ◽  
Total Petroleum Hydrocarbons ◽  
Oily Sludge

scholarly journals Photodegradation of chlorbromuron, atrazine, and alachlor in aqueous systems under solar irradiation

2006 ◽  
Vol 2006 ◽  
pp. 1-6 ◽  
Author(s):  
Cristina Lizama Bahena ◽  
Susana Silva Martínez
Keyword(s):  
Reaction Time ◽  
Chemical Oxygen Demand ◽  
Oxygen Demand ◽  
Aqueous System ◽  
Solar Irradiation ◽  
Aqueous Systems ◽  
Short Time Period ◽  
Direct Photolysis ◽  
Time Period ◽  
Short Time

Homogeneous and heterogeneous aqueous systems of the herbicides of chlorbromuron, atrazine, and alachlor were irradiated with a nonexpensive solar irradiation using a photoreactor with recirculation. Photodegradation of these herbicides occurred in both aqueous systems; however the presence of TiO2clearly accelerated the degradation of the three herbicides in comparison with direct photolysis. Degradation was followed by measuring the chemical oxygen demand (COD) as a function of reaction time for each aqueous system. Over 90% of COD abatement in the heterogeneous aqueous system was obtained in a short time period showing that mineralization of chlorbromuron, atrazine, and alachlor was achieved.

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