Biological nitrate removal processes from drinking water supply-a review

Mohseni-Bandpi, Anoushiravan; Elliott, David J.; Zazouli, Mohammad Ali

doi:10.1186/2052-336x-11-35

Cited by 145 publications

(89 citation statements)

References 83 publications

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“…In previous studies, various HD systems with high nitrogen removal efficiency have been developed for groundwater treatment, such as hollow-fiber membrane reactors, gas-permeable membrane reactors, and sequencing batch reactor (SBR)-membrane bioreactor [6][7][8]. However, the design and operating conditions of these systems are complicated and require specialists and skillful staffs to maintain the systems.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Hydrogenotrophic Denitrification Behavior Using Continuous and Intermittent Hydrogen Gas Supply

Eamrat

Tsutsumi

Kamei

et al. 2017

J. of Wat. & Envir. Tech.

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Nitrate contamination of groundwater has become a serious issue affecting the quality of drinking water and human health. An energy-efficient, low-cost, and simple reactor was developed to remove nitrate via hydrogenotrophic denitrification (HD). Hydrogen (H 2 ) supply was optimized by using a continuous supply of hydrogen (1-15 mL/min). The results revealed that the optimal condition was 5 mL/min, which yielded a nitrogen removal efficiency of 86.4% and a hydrogen effectiveness of 199 mg-N/g-H 2 . In the subsequent experiment, an intermittent hydrogen supply was used to improve the hydrogen effectiveness and hydrogen consumption. Using a cycle with a short period of hydrogen supply (3 min with hydrogen supply and 7 min with no hydrogen supply), excellent nitrogen removal efficiency (96.5%) was achieved, and the hydrogen effectiveness increased to 744 mg-N/g-H 2 . Furthermore, bacteria belonging to the Proteobacteria phylum and Betaproteobacteria class were the major components of the microbial community. However, Hydrogenophaga spp. (39.3%) was dominant under the continuous system, whereas Thauera spp. (58.5%) was the most abundant species under the intermittent system. In this study, Hydrogenophaga spp., Thauera spp., and Rhodocyclaceae, which were responsible for HD, afforded in efficient nitrogen removal from groundwater.

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Section: Introductionmentioning

confidence: 99%

Optimization of Hydrogenotrophic Denitrification Behavior Using Continuous and Intermittent Hydrogen Gas Supply

Eamrat

Tsutsumi

Kamei

et al. 2017

J. of Wat. & Envir. Tech.

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show abstract

“…Contamination of water resources with nitrate has become a very broad and important problem in many regions of the world including Iran (1)(2)(3). It has become more important, possibly due to its high water solubility (4).…”

Section: Introductionmentioning

confidence: 99%

“…Nitrate is threatening to human health and environment; some serious complications of nitrate include induction of blue-baby syndrome especially in infants (methemoglobinemia), promoting eutrophication, and the potential formation of carcinogenic nitrosamine (10)(11)(12). European Union Legislation and United States Environmental Protection Agency have announced that the nitrate level in drinking water is 50 and 10 mg NO 3 − -N/L, respectively (13,14). Several methods are available for nitrate removal including ion exchange, reverse osmosis, biological denitrification, and chemical reduction (6,8,(15)(16)(17).…”

Section: Introductionmentioning

confidence: 99%

Modeling Nitrate Removal by Nano-Scaled Zero-Valent Iron Using Response Surface Methodology

2014

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Background: Contamination of water resources with nitrate is a serious environmental problem in many regions of the world. In addition, this problem has been observed in some regions of Iran. As Nitrate is threatening for human health and environment, it must be decreased to standard levels in drinking water. Objectives: The purpose of this research was to model the nitrate removal from water by nano-scaled zero-valent iron (nZVI) using response surface methodology and to investigate the effects of the nZVI dose, nitrate concentration, contact time, and ionic strength on removal efficiency. Materials and Methods: Box-Behnken design was used. Response surface methodology was used for modeling nitrate removal. All experiments were conducted according to standard methods. Important assessed parameters included nZVI dose (0.5-2 g/L), nitrate concentration (50-150 mg/L), contact time (15-60 minutes), and ionic strength (1000-5000 μmho/cm). Results: Results indicated that there was a direct association between nitrate removal efficiency and time and nZVI dosage. Therefore, increasing of the contact time or nZVI dose would increase nitrate removal. On the other hand, the nitrate removal was decreased when ionic strength and initial concentration were increased. The analysis of variance revealed that the proposed regression model could be appropriately used to design experiments. The model correlation coefficient was 0.9992 and the adjusted value was 0.9982. Conclusions: Response surface methodology and Box-Behnken design were powerful statistical tools for navigating nitrate reduction process. The results showed that a high percentage of nitrate were reduced by nZVI and this method might be efficiently used for nitrate removal from water.

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“…Removal of nitrogen from wastewater is therefore an important means of improving water quality [1,2]. Removal of ammonia and nitrate can be achieved in a biological wastewater treatment plant by exposing a mixed culture of bacteria to alternating aerobic (dissolved oxygen present) and anoxic (dissolved oxygen absent, nitrate present) conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of Protein Crude Extract on Oxic/Anoxic Diauxic Growth of a Napdeficient Mutant of Paracoccus pantotrophus

Yin¹,

Stevenson²,

Koopman³

et al. 2016

J Bioremediat Biodegrad

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In this study it is shown that addition of crude protein extract containing either membrane bound nitrate reductase (Nar) or periplasmic nitrate reductase (Nap) shortens the diauxic lag of denitrifying bacteria switched from aerobic to anoxic conditions. The specific growth rate under anoxic conditions, following resumption of exponential growth, was found to be linearly related to the extract dose.

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Biological nitrate removal processes from drinking water supply-a review

Cited by 145 publications

References 83 publications

Optimization of Hydrogenotrophic Denitrification Behavior Using Continuous and Intermittent Hydrogen Gas Supply

Optimization of Hydrogenotrophic Denitrification Behavior Using Continuous and Intermittent Hydrogen Gas Supply

Modeling Nitrate Removal by Nano-Scaled Zero-Valent Iron Using Response Surface Methodology

Effect of Protein Crude Extract on Oxic/Anoxic Diauxic Growth of a Napdeficient Mutant of Paracoccus pantotrophus

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