Optimization of nitrogen removal from an anaerobic digester effluent by electrocoagulation process

Mohammadi, Azam; Khadir, Ali; M.A.Tehrani, Ramin

doi:10.1016/j.jece.2019.103195

Cited by 40 publications

(10 citation statements)

References 82 publications

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“…The removal rate was calculated as an average of two separate experiments (Figures 5 and 6). Mohammadi et al [21] reported an ammonium removal rate of 60.45-75.91%, whereas Ghimire et al [18] reported a removal rate of 97.6% at a voltage of 5 V, 68% at a voltage of 3 V, and 20% at a voltage of 1.2 V. In the current study, the average voltage in BEC was 11.9 V and that in CEC was 2.2 V in different electrode pairs. This finding on the effect of voltage on ammonium removal is consistent with the earlier observations of Ghimire et al [18].…”

Section: Phosphate and Ammonium Removal From Water Solutionscontrasting

confidence: 43%

“…In this method, the removal efficiencies for phosphate from dairy and mine wastewaters reached up to 93% under optimal conditions. Several studies [18][19][20][21][22][23] have also precipitated struvite (MgNH 4 PO 4 •6H 2 O) through electrocoagulation (EC) and chemical precipitation (CP). These studies have demonstrated that EC can be used in struvite precipitation to remove phosphate from wastewater.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, phosphate can be removed through coagulation, flocculation, adsorption, and biological treatment [22][23][24]. As for the removal of ammonium from water, such methods [18,21,22] as adsorption, air stripping, membrane separation, and ion exchange may be employed. Similar to our earlier work, other studies have investigated struvite formation through electrocoagulation [20,[24][25][26] by using BEC systems, wherein struvite nucleation, crystallization, and quality were analyzed.…”

Section: Introductionmentioning

confidence: 99%

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Phosphate and Ammonium Removal from Water through Electrochemical and Chemical Precipitation of Struvite

Rajaniemi

Nurmesniemi

et al. 2021

Processes

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Batch electrocoagulation (BEC), continuous electrocoagulation (CEC), and chemical precipitation (CP) were compared in struvite (MgNH4PO4·6H2O) precipitation from synthetic and authentic water. In synthetic water treatment (SWT), struvite yield was in BEC 1.72, CEC 0.61, and CP 1.54 kg/m3. Corresponding values in authentic water treatment (AWT) were 2.55, 3.04, and 2.47 kg/m3. In SWT, 1 kg struvite costs in BEC, CEC, and CP were 0.55, 0.55, and 0.11 €, respectively, for AWT 0.35, 0.22 and 0.07 €. Phosphate removal in SWT was 93.6, 74.5, and 71.6% in BEC, CEC, and CP, respectively, the corresponding rates in AWT were 89.7, 77.8, and 74.4%. Ammonium removal for SWT in BEC, CEC, and CP were 79.4, 51.5, and 62.5%, respectively, rates in AWT 56.1, 64.1, and 60.9%. Efficiency in CEC and BEC are equal in nutrient recovery in SWT, although energy efficiency was better in CEC. CP is cheaper than BEC and CEC.

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Section: Phosphate and Ammonium Removal From Water Solutionscontrasting

confidence: 43%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Phosphate and Ammonium Removal from Water through Electrochemical and Chemical Precipitation of Struvite

Rajaniemi

Nurmesniemi

et al. 2021

Processes

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“…The photocatalytic degradation kinetics of the Orange G dye is described by the pseudo-first-order kinetic model, which is expressed as follows − − l n ( C C 0 ) = k × t where C is the initial concentration of Orange G, C 0 is the concentration of the OG dye at t ≠ 0, k is the kinetic constant, and t is the time of reaction.…”

Section: Resultsmentioning

confidence: 99%

Facile and Sustainable Synthesis of ZnO Nanoparticles: Effect of Gelling Agents on ZnO Shapes and Their Photocatalytic Performance

El Faroudi,

Saadi,

Barakat

et al. 2023

ACS Omega

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The present work involves investigating an unexplored soft-chemical method for synthesizing nanostructured ZnO through biopolymer gelation. Our objective was to exploit (i) the difference in the gelation mechanism of four tested biopolymers, namely, alginate, chitosan, carboxymethylcellulose (CMC), and pectin and (ii) numerous experimental parameters that govern this process in order to allow the control of the growth of nanostructured ZnO, with a view to using the prepared oxides as photocatalysts for the oxidation of the Orange G dye. So, the effect of biopolymer’s nature on the microstructural, morphological, and textural properties was examined by thermogravimetric analysis (TGA), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, field-emission gun-scanning electron microscopy-high resolution (FEG-SEM) with energy-dispersive spectrometry (SEM-EDS), ultraviolet–visible (UV–vis) spectroscopy, and N2 adsorption/desorption. As-prepared oxides were crystallized in a hexagonal wurtzite structure, with a clear difference in their morphologies. The sample prepared by using chitosan has a specific surface area of around 36.8 m2/g in the form of aggregated and agglomerated nanostructured minirods and thus shows the best photocatalytic performance with 99.3% degradation of the Orange G dye in 180 min.

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“…In the equation, R is the universal gas constant (8.314 J/mol. K), (J/mol) is related to the adsorption heat constant, is the equilibrium binding constant (L/g), and T (K) is the temperature [35].…”

Section: Adsorption Isothermmentioning

confidence: 99%

Enhanced Adsorption of Ketoprofen and Reactive Yellow 15 from Aqueous Solutions Using Silver Nanoparticle-Modified Luffa: Characterization, Optimization, and Reusability Studies

Tavassoli,

Cheraghi,

Etemadifar

et al. 2023

Preprint

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In the current work, luffa was modified with silver nanoparticles to prepare LF/AgNPs adsorbent for the elimination of ketoprofen and reactive yellow 15 (RY15) from aqueous media. Various characterization techniques, including FTIR, XRD, and SEM-EDS analyses, were employed to confirm the successful modification of LF/AgNPs. Several key parameters such as contact time, adsorbent dosage, concentration, pH, and agitation technique were fine-tuned to optimize the adsorption process. Ketoprofen removal was found to be most effective in weakly acidic conditions (pH=5), while reactive yellow 15 adsorption was enhanced in an acidic environment (pH=2). At 298 K, the highest adsorption capacities reached 56.88 mg/g for ketoprofen and 97.76 mg/g for reactive yellow 15. The adsorption of ketoprofen followed the Temkin isotherm model, indicating a chemisorption process (R2=0.997). Reactive yellow 15, however, adhered to the Freundlich isotherm model, suggesting multilayer adsorption due to uneven distribution of active sites (R2=0.987). Additionally, the kinetics of ketoprofen adsorption were best described by the Pseudo-first order model (R2=0.989), whereas the Pseudo-second order model provided the most accurate fit for reactive yellow 15 adsorption (R2=0.997). Importantly, the LF/AgNPs adsorbent displayed consistent performance over five consecutive reuse cycles, affirming its stability and efficacy in removing both contaminants. These findings underscore the exceptional potential of LF/AgNPs as a reliable adsorbent for the removal of reactive yellow 15 and ketoprofen from aqueous solutions.

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Optimization of nitrogen removal from an anaerobic digester effluent by electrocoagulation process

Cited by 40 publications

References 82 publications

Phosphate and Ammonium Removal from Water through Electrochemical and Chemical Precipitation of Struvite

Phosphate and Ammonium Removal from Water through Electrochemical and Chemical Precipitation of Struvite

Facile and Sustainable Synthesis of ZnO Nanoparticles: Effect of Gelling Agents on ZnO Shapes and Their Photocatalytic Performance

Enhanced Adsorption of Ketoprofen and Reactive Yellow 15 from Aqueous Solutions Using Silver Nanoparticle-Modified Luffa: Characterization, Optimization, and Reusability Studies

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