Investigation of the effects of hydrogenotrophic denitrification and anammox on the improvement of the quality of the drinking water supply system

Khanitchaidecha, Wilawan; Koshy, Pramod; Kamei, Takeshi; Shakya, Maneesha; Kazama, Futaba

doi:10.1080/10934529.2013.797249

Cited by 3 publications

(3 citation statements)

References 19 publications

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“…The results show that the activity of hydrogenotrophic denitrification was able to be enhanced at low organic content. The mechanism of hydrogenotrophic denitrification is explained in Eqn (7) 21 . Furthermore, the total N removal rate reached a maximum of ca 2.4 mg L −1 h −1 at a C/N ratio of 2.0, and later reduced to ca 1.3 mg L −1 h −1 at a C/N ratio of 1.0 in the Cu reactor and SS reactor ( ca 1.2 mg L −1 h −1 in the bioreactor).

{NO}_{3}^{-} + 1.08 {CH}_{3} OH + H^{+} \to 0.46 N_{2} + 0.76 {CO}_{2} + 2.44 H_{2} normalO + 0.06 {5C}_{5} H_{7} O_{2} normalN

H_{2} + 0.35 {NO}_{3}^{-} + 0.35 H^{+} + 0.05 {CO}_{2} \to 0.17 N_{2} + 1.10 H_{2} normalO + 0.01 C_{5} H_{7} O_{2} normalN

…”

Section: Resultsmentioning

confidence: 99%

Enhancement of nitrate removal under limited organic carbon with hydrogen‐driven autotrophic denitrification in low‐cost electrode bio‐electrochemical reactors

Peungtim

Meesungnoen

Mahachai

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND Nitrate‐contaminated water is a concerning environmental and health problem in agricultural areas. Due to its low organic carbon content, such water cannot be purified using a conventional bioreactor with heterotrophic denitrification. Low‐cost bio‐electrochemical reactors were established with the aim of enhancing denitrification performance by cooperation of heterotrophic and hydrogenotrophic denitrification. RESULTS At the lowest C/N ratio of 1.0, the bioreactor reached only 67.4% for NO3‐N removal and 47.5% for total N removal (total N removal rate of ca 1.2 mg L−1 h−1), whereas the Cu reactor (bio‐electrochemical reactor using copper wire as cathode) achieved the best efficiencies of 73.7% and 53.8% for NO3‐N and total N removal (total N removal rate of ca 1.3 mg L−1 h−1), and followed by the SS reactor (bio‐electrochemical reactor using stainless steel wire as cathode). On the other hand, the greatest total organic carbon (TOC) removal efficiency was observed for the bioreactor and followed by the SS reactor and the Cu reactor. The low TOC consumption of 1.2–1.4 mg‐TOC (mg‐N)−1 in the Cu reactor and the SS reactor indicated the enhanced denitrification from coexisting hydrogenotrophic denitrification. In addition, the performance of hydrogenotrophic denitrification was improved by increasing the applied current from 10 to 30 mA. CONCLUSIONS The abundance of autotrophic denitrifying bacteria (identified as hydrogenotrophs) was higher than that of heterotrophic denitrifying bacteria in both the Cu reactor and the SS reactor. Archromobacter and Flavobacterium were the most dominant genera in the biofilm of the Cu reactor cathode and in the suspended sludge, respectively. Hydrogenophaga were detected in both biomass samples, but were absent from the biomass samples of the conventional bioreactor. © 2021 Society of Chemical Industry (SCI).

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{NO}_{3}^{-} + 1.08 {CH}_{3} OH + H^{+} \to 0.46 N_{2} + 0.76 {CO}_{2} + 2.44 H_{2} normalO + 0.06 {5C}_{5} H_{7} O_{2} normalN

H_{2} + 0.35 {NO}_{3}^{-} + 0.35 H^{+} + 0.05 {CO}_{2} \to 0.17 N_{2} + 1.10 H_{2} normalO + 0.01 C_{5} H_{7} O_{2} normalN

…”

Section: Resultsmentioning

confidence: 99%

Enhancement of nitrate removal under limited organic carbon with hydrogen‐driven autotrophic denitrification in low‐cost electrode bio‐electrochemical reactors

Peungtim

Meesungnoen

Mahachai

et al. 2021

J of Chemical Tech & Biotech

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“…This is because H 2 concentration significantly affects the process; an increase leads to a higher bacterial growth rate, which brings about a higher efficiency [28,29]. The last results reported that 0.28 moles of H 2 could reduce 1 mol of NO 3 -N; however, a higher H 2 concentration should be applied to the system so as to reduce the limitation of H 2 [30,31]. Previous studies have suggested that DH should be maintained above 0.2 mg/L since NO 3 -N and NO 2 -N reductases can be inhibited, while NO 2 -N reductase is more sensitive than NO 3 -N reductase, causing NO 2 -N accumulation in the system [8].…”

Section: Effect Of H2 Flow Rate and Sparging Cycle Of Air And H2 Feedmentioning

confidence: 99%

Factors Affecting the Simultaneous Removal of Nitrate and Reactive Black 5 Dye via Hydrogen-Based Denitrification

Singhopon

Shinoda

Rujakom

et al. 2021

Water

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Textile wastewater (TW) contains toxic pollutants that pose both environmental and human health risks. Reportedly, some of these pollutants, including NO3-, NO2- and reactive black 5 (RB-5) dye, can be removed via hydrogen-based denitrification (HD); however, it is still unclear how different factors affect their simultaneous removal. This study aimed to investigate the effect of H2 flow rate, the sparging cycle of air and H2, and initial dye concentration on the TW treatment process. Thus, two reactors, an anaerobic HD reactor and a combined aerobic/anaerobic HD reactor, were used to investigate the treatment performance. The results obtained that increasing the H2 flow rate in the anaerobic HD reactor increased nitrogen removal and decolorization removal rates. Further, increasing the time for anaerobic treatment significantly enhanced the pollutant removal rate in the combined reactor. Furthermore, an increase in initial dye concentration resulted in lower nitrogen removal rates. Additionally, some of the dye was decolorized during the HD process via bacterial degradation, and increasing the initial dye concentration resulted in a decrease in the decolorization rate. Bacterial communities, including Xanthomonadaceae, Rhodocyclaceae, and Thauera spp., are presented as the microbial species that play a key role in the mechanisms related to nitrogen removal and RB-5 decolorization under both HD conditions. However, both reactors showed similar treatment efficiencies; hence, based on these results, the use of a combined aerobic/anaerobic HD system should be used to reduce organic/inorganic pollutant contents in real textile wastewater before discharging is recommended.

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“…Ammonium-nitrogen (NH 4 -N) and nitrate-nitrogen (NO 3 -N) are two main forms of nitrogen-containing species present commonly in wastewater. Previous studies by others [ 3 – 5 ] have shown that high NH 4 -N concentrations (40–50 and 30–40 mg/L) are seen in municipal and agricultural wastewaters, respectively. These levels are considerably greater than the acceptable levels of NH 4 -N and NO 3 -N, which are 0.5 and 5 mg/L, respectively [ 6 ].…”

Section: Introductionmentioning

confidence: 98%

Comparison of Simultaneous Nitrification and Denitrification for Three Different Reactors

Khanitchaidecha

Nakaruk

Koshy

et al. 2015

BioMed Research International

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Discharge of high NH4-N containing wastewater into water bodies has become a critical and serious issue due to its negative impact on water and environmental quality. In this research, the performance of three different reactors was assessed and compared with regard to the removal of NH4-N from wastewater. The highest nitrogen removal efficiency of 98.3% was found when the entrapped sludge reactor (ESR), in which the sludge was entrapped in polyethylene glycol polymer, was used. Under intermittent aeration, nitrification and denitrification occurred simultaneously in the aerobic and anaerobic periods. Moreover, internal carbon was consumed efficiently for denitrification. On the other hand, internal carbon consumption was not found to occur in the suspended sludge reactor (SSR) and the mixed sludge reactor (MSR) and this resulted in nitrogen removal efficiencies of SSR and MSR being 64.7 and 45.1%, respectively. Nitrification and denitrification were the main nitrogen removal processes in the aerobic and anaerobic periods, respectively. However, due to the absence of sufficient organic carbon, denitrification was uncompleted resulting in high NO3-N contents in the effluent.

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Investigation of the effects of hydrogenotrophic denitrification and anammox on the improvement of the quality of the drinking water supply system

Cited by 3 publications

References 19 publications

Enhancement of nitrate removal under limited organic carbon with hydrogen‐driven autotrophic denitrification in low‐cost electrode bio‐electrochemical reactors

Enhancement of nitrate removal under limited organic carbon with hydrogen‐driven autotrophic denitrification in low‐cost electrode bio‐electrochemical reactors

Factors Affecting the Simultaneous Removal of Nitrate and Reactive Black 5 Dye via Hydrogen-Based Denitrification

Comparison of Simultaneous Nitrification and Denitrification for Three Different Reactors

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