Optimization of Nitrate Reduction by Electrocoagulation Using Response Surface Methodology

Hossini, Hooshyar; Rezaee, Abbas

doi:10.17795/jhealthscope-17795

Cited by 12 publications

(5 citation statements)

References 28 publications

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“…The obtained results indicated that the EC-EO method reduced the nitrate concentration by 90% within 90 minutes at a current value of 0.6 ampere. Hossini and Rezaee (2014) combined an EC cell, which supplied with two aluminium anodes and two graphite cathodes, with an air stripping system to remediate nitrate from wastewater. The obtained results demonstrated that this combined system was efficient to remove as high as 97% of nitrate within 120 minutes of electrolysing at a current of 0.14 ampere.…”

Section: Introductionmentioning

confidence: 99%

Energy efficient electrocoagulation using a new flow column reactor to remove nitrate from drinking water – Experimental, statistical, and economic approach

Hashim

Shaw

Khaddar

et al. 2017

Journal of Environmental Management

128

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In this investigation, a new bench-scale electrocoagulation reactor (FCER) has been applied for drinking water denitrification. FCER utilises the concepts of flow column to mix and aerate the water. The water being treated flows through the perforated aluminium disks electrodes, thereby efficiently mixing and aerating the water. As a result, FCER reduces the need for external stirring and aerating devices, which until now have been widely used in the electrocoagulation reactors. Therefore, FCER could be a promising cost-effective alternative to the traditional lab-scale EC reactors. A comprehensive study has been commenced to investigate the performance of the new reactor. This includes the application of FCER to remove nitrate from drinking water. Estimation of the produced amount of H gas and the yieldable energy from it, an estimation of its preliminary operating cost, and a SEM (scanning electron microscope) investigation of the influence of the EC process on the morphology of the surface of electrodes. Additionally, an empirical model was developed to reproduce the nitrate removal performance of the FCER. The results obtained indicated that the FCER reduced the nitrate concentration from 100 to 15 mg/L (World Health Organization limitations for infants) after 55 min of electrolysing at initial pH of 7, GBE of 5 mm, CD of 2 mA/cm, and at operating cost of 0.455 US $/m. Additionally, it was found that FCER emits H gas enough to generate a power of 1.36 kW/m. Statistically, the relationship between the operating parameters and nitrate removal could be modelled with R of 0.848. The obtained SEM images showed a large number dents on anode's surface due to the production of aluminium hydroxides.

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Section: Introductionmentioning

confidence: 99%

Energy efficient electrocoagulation using a new flow column reactor to remove nitrate from drinking water – Experimental, statistical, and economic approach

Hashim

Shaw

Khaddar

et al. 2017

Journal of Environmental Management

128

View full text Add to dashboard Cite

show abstract

“…Similarly, Akhondi et al conducted a study on the removal of cadmium by the EC method and demonstrated that the maximum removal efficiency of cadmium was at 185 W, operation time of 40 min, and pH of 10.25 (31). In another study the maximum removal efficiency of nitrate from drinking water was 84% at 25 V using Hossini and Rezaee indicated that by applying the electric current of 0.14 A for 120 min, the nitrate content decreased to 97% (32). Furthermore, Adhoum et al showed that the optimum current for the maximum removal of phenolic compounds from wastewater was at 75 mA/Cm 2 (33).…”

Section: Effect Of Voltage On Nitrate Removal Using the Electrocoagulmentioning

confidence: 99%

Optimizing Electrocoagulation Process for the Removal of Nitrate From Aqueous Solution

Dehghani

Hoseini

Fath-Aabaadi

et al. 2016

Jundishapur J Health Sci

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Background: High levels of nitrate anion are frequently detected in many groundwater resources in Fars province. Objectives: The present study aimed to determine the removal efficiency of nitrate from aqueous solutions by electrocoagulation process using aluminum and iron electrodes. Materials and Methods: A laboratory-scale batch reactor was conducted to determine nitrate removal efficiency using the electrocoagulation method. The removal of nitrate was determined at pH levels of 3, 7, and 11, different voltages (15, 20, and 30 V), and operation times of 30, 60, and 75 min, respectively. Data were analyzed using the SPSS software version 16 (Chicago, Illinois, USA) and Pearson's correlation coefficient was used to analyze the relationship between the parameters. Results: Results of the present study showed that the removal efficiency was increased from 27% to 86% as pH increased from 3 to 11 at the optimal condition of 30 V and 75 min operation time. Moreover, by increasing the reaction time from 30 V to 75 min the removal efficiency was increased from 63% to 86%, respectively (30 V and pH = 11). Pearson's correlation analysis showed that there was a significant relationship between removal efficiency and voltage and reaction time as well (P < 0.01). Conclusions:In conclusion, the electrocoagulation process can be used for removing nitrate from water resources because of high efficiency, simplicity, and relatively low cost.

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“…EC uses a direct electrical current source between metal electrodes that are partially immersed in the electrolyte. Electric current causes the metal plates to be dissolved in the wastewater (17,18). Two widely used metals in electrocoagulation process are iron and aluminum (11).…”

Section: Introductionmentioning

confidence: 99%

Removal of Reactive Blue 52 by Electrocoagulation and UV/Persulfate from Aqueous Solutions

et al. 2020

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Background: Discharge colored wastewaters without treatment is the main source of aquatic pollution, which will cause considerable impacts to the environment. Objectives: The main objective of this study was the investigation of electrocoagulation merged with advanced oxidation (UV/persulfate) as a novel treatment method in reactive blue 52 removal from aquatic environments. Methods: This work was an experimental study that was done in a glass beaker coupled with two electrodes made of iron, which had an effective total surface area of 60 cm 2 as an electrocoagulation reactor and other cylindrical reactor equipped with 2 UV-C lamps (6 W) as an advanced reactor for reactive blue 52 removal. The parameters affecting the electrocoagulation process such as pH, current density, initial concentration of reactive blue 52, and reaction time was studied. Then, waste obtained from the previous stage exposed to the persulfate process and effect of operating parameters such as pH; sodium persulfate dosage was investigated. Results: Obtained results illustrate that reactive blue 52 was removed with 82.4% efficiency in the below optimal condition: pH = 7, density of current = 10 mA/cm 2 , and time of reaction = 30 min, respectively. In the hybrid process of electrocoagulation and UV/persulfate (pH = 7 and Na2S2O8 = 15 mM/L), the process efficiency in removal of dye was achieved at about 98.86%. Conclusions: Based on the obtained results, combination of two mentioned processes is an efficient and effective method for reactive blue 52 removal from aqueous environments.

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Optimization of Nitrate Reduction by Electrocoagulation Using Response Surface Methodology

Cited by 12 publications

References 28 publications

Energy efficient electrocoagulation using a new flow column reactor to remove nitrate from drinking water – Experimental, statistical, and economic approach

Energy efficient electrocoagulation using a new flow column reactor to remove nitrate from drinking water – Experimental, statistical, and economic approach

Optimizing Electrocoagulation Process for the Removal of Nitrate From Aqueous Solution

Removal of Reactive Blue 52 by Electrocoagulation and UV/Persulfate from Aqueous Solutions

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