Inoculation of a submerged filter for biological denitrification of nitrate polluted groundwater: a comparative study

Moreno, B.; Gómez, M.A.; González‐López, Jesús; Hontoria, E.

doi:10.1016/j.jhazmat.2004.09.027

Cited by 35 publications

(21 citation statements)

References 23 publications

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“…4). Accumulation of nitrite, a highly toxic intermediate in the process of denitrification, has been reported to be influenced by several factors such as oxygen concentration, pH, the type of carbon source, and biofilm composition (Gómeza et al 2000(Gómeza et al , 2002Moreno et al 2005). The experiments clearly indicate that nitrate concentration in the influent may affect the nitrite accumulation in the treated water using BSW as carbon source.…”

Section: Resultsmentioning

confidence: 90%

“…In comparison to physical and chemical methods (such as reverse osmosis, ion exchange and electrodialysis) to remove nitrate from groundwater, biological denitrification stands out for being the most economical and feasible on a large scale, as well as for being the only selective method for removing nitrate by transforming it into harmless nitrogen gas (Volokita et al 1996;Moreno et al 2005;Bidhendi et al 2006). The majority of microbial denitrification treatment relies on heterotrophic bacteria which require an organic carbon source.…”

Section: Introductionmentioning

confidence: 99%

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Denitrification of nitrate-contaminated groundwater using biodegradable snack ware as carbon source under low-temperature condition

Wang

2011

Int. J. Environ. Sci. Technol.

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A considerable increase in nitrate concentration in groundwater has been observed in many countries. This research focuses on nitrate removal using biodegradable snack ware (BSW) as both carbon source and biofilm support for denitrifiers. The denitrification efficiency of a laboratory-scale denitrification reactor packed with BSW was examined in a low-temperature condition. The nitrate removal efficiency supported by BSW decreased to approximately 40% at 12°C from nearly 100% at 25°C with 50 mg/L of nitrate-nitrogen in the influent and 2 h of hydraulic retention time (HRT). The complete nitrate removal was obtained when nitrate-nitrogen concentration was no more than 15 mg/L at 2 h of HRT and at 12°C. If the initial concentration of nitrate-nitrogen was 50 mg/L, 5 h of HRT was needed for the complete nitrate removal. Nitrite concentration in the treated water decreased evidently as HRT was increased from 2 to 5 h, or as nitratenitrogen concentration in the influent decreased to 15 mg/L from 50 mg/L. It was observed that varying HRT and nitrate concentration in the influent had no noticeable effect on dissolved organic carbon content in the effluent under the experimental conditions. This study indicated that the complete nitrate removal could be achieved readily even at 12°C using BSW as carbon source by changing HRT or the initial concentration of nitrate in the influent, which has some useful implications in environmental engineering practice.

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Section: Resultsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Denitrification of nitrate-contaminated groundwater using biodegradable snack ware as carbon source under low-temperature condition

Wang

2011

Int. J. Environ. Sci. Technol.

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“…Generally, activated sludge is used as the seed of denitrifying bacteria (Mohseni-Bandpi and Elliot 1998; Moreno et al 2005). For drinking water treatment, external microorganisms inoculated carry a potential risk of causing deterioration in effluent quality.…”

Section: Resultsmentioning

confidence: 99%

Nitrate removal from groundwater using solid-phase denitrification process without inoculating with external microorganisms

Wang

2013

Int. J. Environ. Sci. Technol.

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Denitrification of groundwater was studied using a laboratory-scale reactor packed with biodegradable snack ware served as both carbon source and biofilm support for microorganisms. The complete removal of 50 mg/L of nitrate-nitrogen was achieved in a 23-day-old reactor with 2.1 h of hydraulic retention time without inoculating with any external microorganisms, which indicates that indigenous microorganisms in groundwater proliferate readily and result in stable biofilm formation onto biodegradable snack ware. Accumulation of nitrite and nitrate residue was detected when hydraulic retention time was lower than 2.1 h. The breakthrough of nitratenitrogen up to over 10 mg/L in the effluent water was observed with nitrate removal efficiency reducing to about 75 % when hydraulic retention time was lowered to 1.4 h. The highest rate of denitrification was observed with 1.5 h of hydraulic retention time. Dissolved organic carbon concentration in the effluent water ranged between 10 and 20 mg/L during the stable operation of the reactor, and nitrite-nitrogen concentration was never higher than 0.09 mg/L. Considering its relatively low price and high denitrification rate, biodegradable snack ware can become a good alternative for denitrification process.

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“…They provide good removal efficiencies, even with effluents with the low 5-day biochemical oxygen demand (BOD 5 ) to chemical oxygen demand (COD) ratio (BOD 5 /COD) commonly found in many leachates (Gálvez et al 2009). Biofilm technology has been shown to be an economic and effective method to degrade nitrate (Moreno et al 2005). The availability and type of organic carbon compounds and the oxidation/reduction state of wastewater determine, to a large extent, the occurrence of nitrate reduction (van Rijn et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Denitrification of a landfill leachate with high nitrate concentration in an anoxic rotating biological contactor

et al. 2010

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The denitrification performance of a lab-scale anoxic rotating biological contactor (RBC) using landfill leachate with high nitrate concentration was evaluated. Under a carbon to nitrogen ratio (C/N) of 2, the reactor achieved N-NO(3)(-) removal efficiencies above 95% for concentrations up to 100 mg N-NO(3)(-) l(-1). The highest observed denitrification rate was 55 mg N-NO(3)(-) l(-1) h(-1) (15 g N-NO(3)(-) m(-2) d(-1)) at a nitrate concentration of 560 mg N-NO(3)(-) l(-1). Although the reactor has revealed a very good performance in terms of denitrification, effluent chemical oxygen demand (COD) concentrations were still high for direct discharge. The results obtained in a subsequent experiment at constant nitrate concentration (220 mg N-NO(3)(-) l(-1)) and lower C/N ratios (1.2 and 1.5) evidenced that the organic matter present in the leachate was non-biodegradable. A phosphorus concentration of 10 mg P-PO(4)(3-) l(-1) promoted autotrophic denitrification, revealing the importance of phosphorus concentration on biological denitrification processes.

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Inoculation of a submerged filter for biological denitrification of nitrate polluted groundwater: a comparative study

Cited by 35 publications

References 23 publications

Denitrification of nitrate-contaminated groundwater using biodegradable snack ware as carbon source under low-temperature condition

Denitrification of nitrate-contaminated groundwater using biodegradable snack ware as carbon source under low-temperature condition

Nitrate removal from groundwater using solid-phase denitrification process without inoculating with external microorganisms

Denitrification of a landfill leachate with high nitrate concentration in an anoxic rotating biological contactor

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