scholarly journals Optimizing electrocoagulation process using experimental design for COD removal from unsanitary landfill leachate

2017 ◽  
Vol 76 (11) ◽  
pp. 2907-2917 ◽  
Author(s):  
Aysenur Ogedey ◽  
Mehtap Tanyol
Keyword(s):  
Current Density ◽  
Landfill Leachate ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Main Process ◽  
Electrode Distance ◽  
Electrocoagulation Process ◽  
High Pollution ◽  
Pre Treatment ◽  
Treatment Step

Abstract Leachate is the most difficult wastewater to be treated due to its complex content and high pollution release. For this reason, since it is not possible to be treated with a single process, a pre-treatment is needed. In the present study, a batch electrocoagulation reactor containing aluminum and iron electrodes was used to reduce chemical oxygen demand (COD) from landfill leachate (Tunceli, Turkey). Optimization of COD elimination was carried out with response surface methodology to describe the interaction effect of four main process independent parameters (current density, inter-electrode distance, pH and time of electrolysis). The optimum current density, inter-electrode distance, pH and time of electrolysis for maximum COD removal (43%) were found to be 19.42 mA/m2, 0.96 cm, 7.23 and 67.64 min, respectively. The results shown that the electrocoagulation process can be used as a pre-treatment step for leachate.

scholarly journals COD removal from leachate by electrocoagulation process: treatment with monopolar electrodes in parallel connection

2017 ◽  
Vol 77 (1) ◽  
pp. 177-186 ◽  
Author(s):  
Mehtap Tanyol ◽  
Aysenur Ogedey ◽  
Ensar Oguz
Keyword(s):  
Current Density ◽  
Operating Cost ◽  
Oxygen Demand ◽  
Electrical Energy ◽  
Cod Removal ◽  
Iron Electrode ◽  
Time Intervals ◽  
Electrode Distance ◽  
Electrocoagulation Process ◽  
Monopolar Electrodes

Abstract This study examines the removal of chemical oxygen demand (COD) from landfill leachate generated from the municipal landfill site of Bingol, Turkey. The effect of parameters such as current density, pH, and inter-electrode distance during the electrocoagulation (EC) process on COD removal of the process was investigated. Moreover, for COD removal, the energy consumption and operating costs were calculated for iron electrode under the EC conditions. COD removal efficiency was 72.13% at the current density of 16 mA m−2, pH of 8.05, and the inter-electrode distance of 9 mm at the detention time of 60 min with iron electrode and the COD concentration was reduced from 6,100 mg L−1 to 1,700 mg L−1 by EC. The highest value of the electrical energy and electrode consumptions per kg of COD in the optimum conditions were determined as 0.055 kWh kg−1 COD and 3.43 kg kg−1 COD and the highest operating cost value was found to be 1.41 US$ kg−1 COD for 0–60 min time intervals.

scholarly journals Investigating the Electrocoagulation Treatment of Landfill Leachate by Iron/Graphite Electrodes: Process Parameters and Efficacy Assessment

Water ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 205
Author(s):  
Tahereh Rookesh ◽  
Mohammad Reza Samaei ◽  
Saeed Yousefinejad ◽  
Hassan Hashemi ◽  
Zahra Derakhshan ◽  
...  
Keyword(s):  
Current Density ◽  
Landfill Leachate ◽  
Performance Indicators ◽  
Oxygen Demand ◽  
Cost Effective ◽  
Leachate Treatment ◽  
Graphite Electrodes ◽  
Electrode Distance ◽  
Electrocoagulation Process ◽  
Efficacy Assessment

Electrocoagulation is a widely used method for treating leachate since it is cost effective and eco-friendly. In the present study, the electrocoagulation process was employed to remove chemical oxygen demand (COD), NH4+, total dissolved solids (TDS), total suspended solids (TSS), turbidity, and color from landfill leachate. At first, lime was used as a pretreatment, then the Fe/Gr and Ti/PbO2/steel electrodes were used, and the optimum electrode was selected. Afterwards, the effects of some variables, including pH, current density, temperature, the inter-electrode distance, and the type of electrolyte were investigated. Results showed that COD, NH4+, TSS, TDS, electrical conductivity (EC), turbidity, color, and pH of effluent pretreatment chemical reached 22,371, 385, 884, 21,820 (mg/L), 13.8 (ms/cm3), 1355 (NTU), 8500 (TCU) and 10, respectively (the removal efficiency was 0, 20.37, 32.4, 61.99, 59.18, and 56.6 percent). With the Fe/Gr electrode, the optimal condition was observed as follows: pH of 7.5, current density of 64 mA/cm2, inter-electrode distance was equal to 1.5 cm, temperature at 20 °C, and retention time 2–4 h. Overall, the electrocoagulation with the Fe/Gr electrode was a suitable technology for landfill leachate treatment due to its effectiveness for the removal of both COD and NH4+, with advantageous performance indicators.

Raw landfill leachate treatment using an electrocoagulation process with a novel rotating electrode reactor

2019 ◽  
Vol 80 (3) ◽  
pp. 458-465 ◽  
Author(s):  
Ahmed Samir Naje ◽  
Mohammed A. Ajeel ◽  
Isam Mohamad Ali ◽  
Hussein A. M. Al-Zubaidi ◽  
Peter Adeniyi Alaba
Keyword(s):  
Landfill Leachate ◽  
Suspended Solids ◽  
Treatment Process ◽  
Oxygen Demand ◽  
Neutral Medium ◽  
Leachate Treatment ◽  
Rotating Speed ◽  
Electrode Distance ◽  
Treatment Performance ◽  
Electrocoagulation Process

Abstract In this work, landfill leachate treatment by electrocoagulation process with a novel rotating anode reactor was studied. The influence of rotating anode speed on the removal efficiency of chemical oxygen demand (COD), total dissolved solids (TDS), and total suspended solids (TSS) of raw landfill leachate was investigated. The influence of operating parameters like leachate pH, leachate temperature, current, and inter-distance between the cathode rings and anode impellers on the electrocoagulation performance were also investigated. The results revealed the optimum rotating speed is 150 rpm and increasing the rotating speed above this value led to reducing process performance. The leachate electrocoagulation treatment process favors the neutral medium and the treatment performance increases with increasing current intensity. Furthermore, the electrocoagulation treatment performance improves with increasing leachate temperature. However, the performance reduces with increasing inter-electrode distance.

DECOLOURIZATION AND COD REMOVAL OF WASEWATER FROM ETHANOL PRODUCTION PROCESS FROM MOLASSES BY COAGULANTION USING INORGANIC ALUM

2010 ◽  
Vol 13 (3) ◽  
pp. 92-102
Author(s):  
Trung Duc Le
Keyword(s):  
Ethanol Production ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Treated Wastewater ◽  
Treatment Processes ◽  
Physico Chemical ◽  
Biological Methods ◽  
Treatment Step ◽  
Main Material

The industrial production of ethanol by fermentation using molasses as main material that generates large quantity of wastewater. This wastewater contains high levels of colour and chemical oxygen demand (COD), that may causes serious environmental pollution. Most available treatment processes in Vietnam rely on biological methods, which often fail to treat waste water up to discharge standard. As always, it was reported that quality of treated wastewater could not meet Vietnameses discharge standard. So, it is necessary to improve the treatment efficiency of whole technological process and therefore, supplemental physico-chemical treatment step before biodegradation stage should be the appropriate choice. This study was carried out to assess the effect of coagulation process on decolourization and COD removal in molasses-based ethanol production wastewater using inorganic coaglutant under laboratory conditions. The experimental results showed that the reductions of COD and colour with the utilization of Al2(SO4)3 at pH 9.5 were 83% and 70%, respectively. Mixture FeSO4 – Al2(SO4)3 at pH 8.5 reduced 82% of colour and 70% of COD. With the addition of Polyacrylamide (PAM), the reduction efficiencies of colour, COD and turbidity by FeSO4 – Al2(SO4)3 were 87%, 73.1% and 94.1% correspondingly. It was indicated that PAM significantly reduced the turbidity of wastewater, however it virtually did not increase the efficiencies of colour and COD reduction. Furthermore, the coagulation processes using PAM usually produces a mount of sludge which is hard to be deposited.

scholarly journals UVA-LED Technology’s Treatment Efficiency and Cost in a Competitive Trial Applied to the Photo-Fenton Treatment of Landfill Leachate

Processes ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 1026
Author(s):  
Javier Tejera ◽  
Antonio Gascó ◽  
Daphne Hermosilla ◽  
Víctor Alonso-Gomez ◽  
Carlos Negro ◽  
...  
Keyword(s):  
Landfill Leachate ◽  
Mercury Vapor ◽  
Cod Removal ◽  
Treatment Efficiency ◽  
Alternative Source ◽  
Effluent Quality ◽  
Radiation Sources ◽  
Initial Ph ◽  
Pre Treatment ◽  
Set Up

The objective of this trial was to assess the application of UVA-LED technology as an alternative source of irradiation for photo-Fenton processes, aiming to reduce treatment costs and provide a feasible treatment for landfill leachate. An optimized combination of coagulation with ferric chloride followed by photo-Fenton treatment of landfill leachate was optimized. Three different radiation sources were tested, namely, two conventional high-pressure mercury-vapor immersion lamps (100 W and 450 W) and a custom-designed 8 W 365 nm UVA-LED lamp. The proposed treatment combination resulted in very efficient degradation of landfill leachate (COD removal = 90%). The coagulation pre-treatment removed about 70% of the COD and provided the necessary amount of iron for the subsequent photo-Fenton treatment, and it further favored this process by acidifying the solution to an optimum initial pH of 2.8. The 90% removal of color improved the penetration of radiation into the medium and by extension improved treatment efficiency. The faster the Fenton reactions were, as determined by the stoichiometric optimum set-up reaction condition of [H2O2]0/COD0 = 2.125, the better were the treatment results in terms of COD removal and biodegradability enhancement because the chances to scavenge oxidant agents were limited. The 100 W lamp was the least efficient one in terms of final effluent quality and operational cost figures. UVA-LED technology, assessed as the application of an 8 W 365 nm lamp, provided competitive results in terms of COD removal, biodegradability enhancement, and operational costs (35–55%) when compared to the performance of the 450 W conventional lamp.

scholarly journals Bioelectricity production from tofu wastewater using microbial fuel cells with microalgae Spirulina sp as catholyte

2020 ◽  
Vol 202 ◽  
pp. 08007
Author(s):  
Wahyu Zuli Pratiwi ◽  
Hadiyanto Hadiyanto ◽  
Purwanto Purwanto ◽  
Muthi’ah Nur Fadlilah
Keyword(s):  
Wastewater Treatment ◽  
Fuel Cells ◽  
Microbial Fuel Cells ◽  
Organic Waste ◽  
Oxygen Demand ◽  
Salt Bridge ◽  
Cod Removal ◽  
Biofuel Production ◽  
Pre Treatment ◽  
Made In

Microalgae-Microbial Fuel Cells (MMFCs) are very popular to be used to treat organic waste. MMFCs can function as an energy-producing wastewater pre-treatment system. Wastewater can provide an adequate supply of nutrients, support the large capacity of biofuel production, and can be integrated with existing wastewater treatment infrastructure. The reduced content of Chemical Oxygen Demand (COD) is one way to measure the efficiency of wastewater treatment. MMFCs reactors are made in the form of two chambers (anode and cathode) both of which are connected by a salt bridge. Tofu wastewater as an anode and Spirulina sp as a cathode. To improve MFCs performance which is to obtain maximum COD removal and electricity generation, nutrient NaHCO3 as the nutrient carbon source for Spirulina sp was varied. The system running phase on 12 days. The results were Spirulina sp treated with MFCs technology has better growth than non-MFCs. The MMFC generated a maximum power density of 21.728 mW/cm2 and achieved 57.37% COD removal. These results showed that the combined process was effective in treating tofu wastewater.

Use of dairy reject and fermented Aleo sp. Leaf Gel mixture in the biological Pre-treatment of landfill leachate

2018 ◽  
Vol 13 (1) ◽  
pp. 219-228 ◽  
Author(s):  
Kasmi Mariam ◽  
Elleuch Lobna ◽  
Abidi Haifa ◽  
Cherni Yassmine ◽  
Hosni Cyrine ◽  
...  
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Organic Matter ◽  
Size Effect ◽  
Landfill Leachate ◽  
Yeast Strain ◽  
Oxygen Demand ◽  
Treatment Efficiency ◽  
Chemical Oxygen Demand Removal ◽  
Pre Treatment ◽  
Aloe Gel

Abstract In this study the biotreatability of Jebel Chakir landfill leachate (Tunisia) using a mixture of dairy industry reject (bactofugate) and Aloe sp. leaf gel was evaluated. The effect of Aloe gel fermentation using Saccharomyces cerevisiae yeast strain was investigated against some selected bacterial and fungal strains. The inoculation size effect of the treatment mixtures (2, 6, 10 and 12%) in the treatment efficiency was also studied. The obtained results showed that when natural Aloe gel and bactofugate mixtures were used the recorded chemical oxygen demand removal rates exceeded 56% within 48 h of treatment. Whereas, the use of the fermented Aloe gel in the treatment mixtures has promoted the organic matter removal to reach 72%.

Optimization of Conditions for Wastewater Treatment and Kinetics Establishment by Yeast

2013 ◽  
Vol 726-731 ◽  
pp. 2441-2448
Author(s):  
Chen Song ◽  
Jiang Ping Li ◽  
Yi Xin Sun ◽  
Hai Long ◽  
Wei Wu
Keyword(s):  
Oxygen Demand ◽  
Cod Removal ◽  
Optimum Conditions ◽  
Kinetics Parameters ◽  
Biological Water ◽  
Orthogonal Experiments ◽  
The Difference ◽  
Pre Treatment ◽  
Biological Water Treatment ◽  
Kinetics Of

Yeast SP1 was selected from the three strains to remove chemical oxygen demand (COD) in wastewater from refining part of N, 2, 3-trimethyl-2-isopropyl butanamide (WS-23). The effects of some factors on the degradation for wastewater from refining part of WS-23 were investigated and the optimum conditions for biological water treatment by yeast SP1 were obtained through orthogonal experiments. The results indicate that this wastewater can be treated directly by yeast without any pre-treatment and the best conditions are as follows: inoculum is 10% (v/v), reaction temperature at 30 °C for 48 h. Under these conditions, the total COD removal efficiency can reach 87.11%. In addition, according to Monod model, the kinetics parameters were obtained from the experiments by determining influent COD (S0), effluent COD (Se), biomass (X) and the kinetics of COD removal was established, furthermore, the difference of experimental and calculated values was within 1 hour by testing.

Electrochemical Treatment of Oilfield Produced Wastewater on Ni-Sb- SnO2/Ti Electrodes

2013 ◽  
Vol 16 (2) ◽  
Author(s):  
Wang Yun-Hai ◽  
Kuang Jun-Yao
Keyword(s):  
Energy Efficiency ◽  
Current Efficiency ◽  
Current Density ◽  
Tin Dioxide ◽  
Electrochemical Treatment ◽  
Cod Removal ◽  
Electrolysis Time ◽  
Removal Ratio ◽  
Electrode Distance

AbstractNickel and antimony doped tin dioxide (NATO) coated titanium electrodes were used for electrochemical treatment of oilfield produced wastewater. The effects of electrode distance, current density and electrolysis time on COD removal ratio, current efficiency, energy efficiency and BOD to COD ratio were investigated. The optimized electrode distance of 5 mm and current density of 6 mA cm

scholarly journals Electrocoagulation Treatment for Landfill Leachate using Stainless Steel Electrode

2019 ◽  
Vol 9 (1) ◽  
pp. 2851-2855
Keyword(s):  
Stainless Steel ◽  
Landfill Leachate ◽  
Applied Voltage ◽  
Metal Ion ◽  
Oxygen Demand ◽  
Stainless Steel Electrode ◽  
Electrolysis Time ◽  
Steel Electrode ◽  
Electrode Distance ◽  
Wide Range

Electrocoagulation (EC) process uses direct electric current source between metal electrode submerged in the effluent that results in electrode dissolution, with a suitable pH, metal ion can form a wide range of metal hydroxide and coagulated species that destabilized and dissolved contaminants absorbed. Electrocoagulation (EC) has been working for the percentage removal of BOD (Biochemical oxygen demand)/ chemical oxygen demand (COD) ratio, Color and COD on leachate in a batch Electrocoagulation reactor using stainless steel (SS) electrode. EC technology depends on so many factors such as electrode material, initial pH, applied voltage, inter-electrode distance, and electrolysis time. From the experimental work, results reveal that the maximum percentage of removal achieved were COD and Color 73.5% and 65.0% respectively and increasing BOD/COD ratio 0.11 to 0.62. The optimum inter-electrode distance 1cm with electrode surface area 35 cm2 and optimum electrolysis time of 120 min at optimum applied voltage 12V, stirring speed 250 rpm and pH 9.8. These results proved that the EC process is an appropriate and proficient approach for treating the landfill leachate.

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