Denitrification of high-nitrate, high-salinity wastewater

Glass, Charles; Silverstein, JoAnn

doi:10.1016/s0043-1354(98)00177-8

Cited by 226 publications

(143 citation statements)

References 16 publications

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“…3 Track study of ammonia oxidation and nitrite reduction in SBR at different loadings: a ammonia oxidization and b nitrite reduction. K means slope Table 2 Overview of kinetic parameters obtained in some study Glass and Silverstein (1999) Sludge flocs and settleability Biosolid-liquid separation by gravity settling is one of the most critical operations in the activated sludge process. The effective solid-liquid separation depends on the formation of dense flocs and the good settling of activated sludge.…”

Section: Kinetics Characterizationmentioning

confidence: 99%

Start-up of halophilic nitrogen removal via nitrite from hypersaline wastewater by estuarine sediments in sequencing batch reactor

Cui

Ding

et al. 2013

Int. J. Environ. Sci. Technol.

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Nitrogen removal from hypersaline wastewater was successfully started up by inoculating estuarine sediments for 140 days. Efficient ammonia and total nitrogen removal was sustained under specific ammonia loading of 0.016-0.139 kg N/[kg VSS day] in a sequencing batch reactor. Stable nitrite accumulation was observed during nitrification. The specific ammonia consumption rate was higher than the value of freshwater activated sludge and saltacclimated freshwater activated sludge. With methanol as carbon source, specific nitrite reduction rate of halophilic denitrifiers was much less than the freshwater counterpart. Halophilic activated sludge was characterized as good settling and flocculation prosperity with small floc size and netlike sludge structure. The abundance of ammonia-oxidizing bacteria outnumbered ammonia-oxidizing archaeas in both estuarine sediments and the activated sludge. Nitrifier population was dominated by the halophilic members of genus Nitrosomonas. This study demonstrated the application of mixed halophilic consortia for efficient nitrogen removal, overcoming the limits and difficulties of applying freshwater bacteria for saline wastewater treatment.

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Section: Kinetics Characterizationmentioning

confidence: 99%

Start-up of halophilic nitrogen removal via nitrite from hypersaline wastewater by estuarine sediments in sequencing batch reactor

Cui

Ding

et al. 2013

Int. J. Environ. Sci. Technol.

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“…During start-up, the reactor was fed with synthetic wastewater diluted 50% with drinking water with the aim of progressively acclimating the biomass to the high nitrate concentration of the wastewater to be treated [25,26]. The COD/NO 3 -N ratio initially employed was 5, using sodium acetate as carbon source [16].…”

Section: System Configuration and Operationmentioning

confidence: 99%

Denitrification of high nitrate concentration wastewater using alternative carbon sources

Fernández-Nava

Marañón

Soons

et al. 2010

Journal of Hazardous Materials

206

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The use of different organic carbon sources in the denitrification of wastewater containing 2500 mg nitrates/L in a SBR was studied. Three alternative sources of carbon were tested: wastewater from a sweet factory, a residue from a soft drinks factory and a residue from a dairy plant. The first two are sugar rich, whereas the third presents a high content in lactic acid. Maximum specific denitrification rates of between 42 and 48 mg NO 3 -N/g VSS·h were obtained. The effluents were nitrate free and very low COD concentrations were obtained in 4-6 hours reaction time, especially with the sugar-rich carbon sources. The values of the denitrifier net yield coefficient were higher than when using methanol (0.93-1.75 g VSS formed /g NOx-N reduced ). The lowest value was obtained using the lactic acid-rich residue. The optimum COD/N ratios varied between 4.6 for the lactic acid-rich carbon source and 5.5 -6.5 for the sugar-rich carbon sources.

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“…Cette inhibition affecte la première étape de la dénitrification. La production maximale de nitrite, indice du démarrage du processus biologique [11,12] , est de plus en plus décalée dans le temps et la concentration en nitrites dans le milieu augmente d'autant. Les microorganismes responsables de la réduction des nitrites sont donc inhibés par le p-éthylphénol puisque sa présence en grande quantité induit une accumulation de la forme nitrite intermédiaire.…”

Section: Essai 3 : Utilisation Du P-éthylphénol Comme Substratunclassified

Etude de la biodénitrification sur support ligno-cellulosique en présence de 4-éthylphénol

Fdil¹,

Lhadi²,

Morvan³

2002

Environnement, Ingénierie &Amp; Développement

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Les expériences de dénitrification effectuées ont montré que les microorganismes dénitrifiants sont très sensibles à l'action d'inhibiteurs tels que l'accumulation de nitrites ou la présence d'un toxique dans les eaux à dénitrifier. Ces expériences ont consisté à étudier l'effet de concentrations variées de p-éthyl-phénol sur la dénitrification biologique hétérotrophe, sur substrat cellulosique naturel (la canne de Provence). Les essais sont effectués en flacons ensemencés par un inoculum constitué de bactéries indigènes et contenant un substrat carboné, des nitrates, des phosphates et du bicarbonate de potassium, afin que les conditions de croissance bactérienne ne limitent pas la dénitrification. Des prélèvements sont effectués à différents temps, et les échantillons sont analysés pour un suivi de nitrates et de nitrites, et sont dosés en spectrophotométrie UV à 192,27 nm, lors du troisième essai où le p-éthylphénol est utilisé en tant que substrat organique. En présence du substrat cellulosique, les faibles concentrations en p-éthylphénol (0,3 à 1 mg/L) n'affectent pas de manière significative le processus de dénitrification. Quand la concentration augmente, on constate un effet inhibiteur qui affecte les microorganismes responsables de la réduction des nitrites. Jusqu'à des concentrations de 600 mg/L de p-éthyl-phénol, la biomasse paraît s'adapter et la dénitrifi-cation est menée jusqu'à son terme. Une teneur de 800 mg/L est létale pour les organismes dénitrifiants. En présence de 4-éthylphénol (sans ajout de substrat cellulosique), les résultats obtenus sont comparables à ceux de l'expérimentation précédente ; on constate toutefois un effet inhibiteur de 4-éthyl-phénol qui se traduit par une diminution sévère du rendement de la dénitrification même à faible concentration avec une accumulation très élevée en nitrites (supérieure à 30 mg/L). Cette différence de comportement s'explique par l'adsorption de l'éthyl-phénol sur les copeaux de canne apportés par l'inoculum.In some Moroccan areas, ground waters are contaminated with nitrates. The concentrations can reach 100 to 400 mg/L. Such ground waters are the only source for rural people daily demand. Therefore, it is needful to ensure a rustic denitrification treatment. In the lab, a biodenitrification process has been studied using reed cellulose as carbon source and reducing agent. Moreover, the denitrified water (NO 3 -< 50 mg/L, NO 2 -< 0,1 mg/L) contained organic matter. As the last step of treatment chain was chlorination, THMs were formed in levels higher as allowable. So, reed and the effluent were extracted with organic solvents and a few organic compounds, especially phenols, were identified by gas chromatography coupled to the spectrometry of mass (GC/MS). Therefore, the aim of this work was the study of the 4-ethylphenol effect on the biodenitrification. This molecule was present in both, reed and denitrified water. (table 3), Some 250 mL vessels were filled with solution containing nutrients (nitrate and phosphate), the pH was adjusted at 7,5 with...

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Denitrification of high-nitrate, high-salinity wastewater

Cited by 226 publications

References 16 publications

Start-up of halophilic nitrogen removal via nitrite from hypersaline wastewater by estuarine sediments in sequencing batch reactor

Start-up of halophilic nitrogen removal via nitrite from hypersaline wastewater by estuarine sediments in sequencing batch reactor

Denitrification of high nitrate concentration wastewater using alternative carbon sources

Etude de la biodénitrification sur support ligno-cellulosique en présence de 4-éthylphénol

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