Experimental investigation on the chemical reduction of nitrate from groundwater

Luk, Grace K.; Au-Yeung, Wai Ching

doi:10.1016/s1093-0191(01)00072-7

Cited by 71 publications

(47 citation statements)

References 9 publications

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“…- [11]. In another study [35], 1.95 m 2 of iron was prescribed for complete nitrate removal, higher than the amount of Mg/Cu observed (1.5 m 2 ) in this study.…”

Section: Effect Of Mg/cu Dosage On Nitrate Reductioncontrasting

confidence: 62%

“…Because nitrite has greater negative health and environmental effects than ammonium (MCL nitrite 0.03 mg M and MCL ammonium 0.4 mg M in drinking water) [39], the formation of only ammonium at reaction times under 60 min in this system is an advantage over Fe 0 systems, in which nitrite can accumulate in the early stages [11,31]. Ammonium can be removed by ammonia stripping or by the formation of chloramines, efficient disinfectants; the latter could be of practical use if this system were situated upstream of the chlorination process in a water treatment plant.…”

Section: Nitrogen Balancementioning

confidence: 99%

“…3a is the result for a blank solution containing only nitrate (150 mg/L NO 3 -); the loss of nitrate was insignificant in the absence of the Mg/Cu bimetal. Specifically, the zero-valent aluminium and magnesium maximum denitrification efficiencies were 50 and 73% with initial nitrate concentrations of 50 and 100 mg/L NO 3 -, respectively [1,11]. The rapid nitrate reduction by the Mg/Cu bimetal may be explained by the low activation energy for Mg/Cu, 12.77 kJ/mol, (see Table 2) indicating that Mg/Cu may be more effective at reducing aqueous nitrate than pure Mg 0 particles (17.7 kJ/mol) [1] or nano-Fe 0 particles (25.8 kJ/mol) [5].…”

Section: Surface Characteristics Of Mg/cu Particlesmentioning

confidence: 99%

“…Although biological denitrification has been widely applied to remove nitrate, this method is complex and difficult to perform practically [8][9][10]. Therefore, the use of zero-valent metals such as zinc, aluminum and especially iron in the chemical method of nitrate removal have been evaluated intensively in the last decade [11][12][13]. The reduction of nitrate by Fe 0 poses many challenges when compared to other metal such as Mg 0 including the need for a high dose, the possibility of Fe 2?…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of the chemical reduction of nitrate ion in aqueous solution by Mg/Cu bimetallic particles

Ramavandi

Mortazavi

Moussavi

et al. 2011

Reac Kinet Mech Cat

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Bimetallic particles have recently been used as a new means of contaminant reduction from water. Comparing with Fe 0 and Mg 0 alone, synthesized magnesium/copper (Mg/Cu) bimetallic particles have been determined to be potential and efficient agents for nitrate reduction from aqueous solutions. This study suggests that the reductive denitrification of nitrate by Mg/Cu bimetallic particles was dependent on a number of parameters including reductant dose, solution temperature, initial nitrate concentration and contact time. The 1% Mg/Cu (Cu loading of 1 wt.%) bimetallic particles removed the majority of the various nitrate concentrations tested (50, 100, 150, 200 and 300 mg/L) within a short period. The time required for the removal of 90.6% of the NO 3 -from a 100-mg/L solution was about 20 min using 2 g/L bimetallic Mg/Cu at an initial solution pH of 6. The activation energy (E a ) for the nitrate reduction by 1% Mg/Cu over the temperature range of 5-60°C was 12.77 kJ/mol. The experimental results of the kinetic analysis from batch studies indicated that a higher initial nitrate concentration yielded a greater reaction rate constant and the denitrification rate increased with increasing 1% Mg/Cu dosage. The effects of mixing rate on the denitrification rate suggested that the reaction rate increases linearly at mixing rate \100 rpm and remained almost constant at rates over that.

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“…- [11]. In another study [35], 1.95 m 2 of iron was prescribed for complete nitrate removal, higher than the amount of Mg/Cu observed (1.5 m 2 ) in this study.…”

Section: Effect Of Mg/cu Dosage On Nitrate Reductioncontrasting

confidence: 62%

Section: Nitrogen Balancementioning

confidence: 99%

Section: Surface Characteristics Of Mg/cu Particlesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental investigation of the chemical reduction of nitrate ion in aqueous solution by Mg/Cu bimetallic particles

Ramavandi

Mortazavi

Moussavi

et al. 2011

Reac Kinet Mech Cat

View full text Add to dashboard Cite

show abstract

“…According to the World Health Organization (WHO) recommendations, the maximum allowable concentration of nitrate in drinking water is 50 mg/L (7). Various methods for nitrate elimination were reported such as ion exchange, biological treatment, reverse osmosis, chemical reduction, and electrochemical processes (7)(8)(9). These conventional technologies have some disadvantages such as generating a large amount of intermediates, which require further treatment, continuous monitoring, and slow kinetics rate (8)(9)(10)(11).…”

Section: Introductionmentioning

confidence: 99%

Optimization of Nitrate Reduction by Electrocoagulation Using Response Surface Methodology

Hossini

Rezaee

2014

Health Scope

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Background:The presence of nitrate and its intermediates are considered undesirable compounds in the environment. Various methods have been proposed to remove nitrate from wastewater and water streams. Objectives: In this study, we investigated removal of nitrate from an aqueous solution by the process of electrocoagulation, using aluminum/graphite as the anode/cathode electrodes. Materials and Methods:We applied response surface methodology (RSM) as the statistical method for modeling, and optimizing the applied variables. All experiments were performed according to the standard methods for the examination of water and wastewater. To prepare the optimum condition, we considered the following amount of compounds and conditions: NaCl, 1 g/L; nitrate concentration range, 50-200 mg/L; applied electric current range, 0.05-0.2 A; anode, aluminum; cathode, graphite; and detention time: 120 minutes. Results:The results showed that by applying electric current of 0.14 A for 120 minutes, the nitrate content would reduce down to 97%. The obtained R 2 for the nitrate removal model was higher than 0.99. With regard to supporting electrolytes, more nitrate reduction is obtained with NaCl. The oxidation reduction potential (ORP) was changed from 220 to -375 mV and this range is suitable for denitrification and nitrate reduction. Conclusions:The results of this study show that it is possible to remove nitrate, and its intermediates from waste water. Regarding the desirability of the process, the field scale study is proposed.

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General Introduction

Liu

Huang

Fallowfield

et al. 2013

Study on Heterotrophic-Autotrophic Denitrification Permeable Reactive Barriers (HAD PRBs) for in Situ Groundwater Remediation

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Experimental investigation on the chemical reduction of nitrate from groundwater

Cited by 71 publications

References 9 publications

Experimental investigation of the chemical reduction of nitrate ion in aqueous solution by Mg/Cu bimetallic particles

Experimental investigation of the chemical reduction of nitrate ion in aqueous solution by Mg/Cu bimetallic particles

Optimization of Nitrate Reduction by Electrocoagulation Using Response Surface Methodology

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