Kinetic interpretation of nitrogen removal in pilot scale experiments

Harremoës, Poul; Sinkjær, Ole

doi:10.1016/0043-1354(94)00207-n

Cited by 32 publications

(8 citation statements)

References 3 publications

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“…It can also be noted that the reduction of the HRT from 10 to 7 hours resulted in a slight overall increase in the specific nitrification rates in both systems, and these increases were found also to be statistically significant. The specific nitrification rates in the membrane and conventional mixed liquor were observed to be between 3 and 5 mg‐N/(g VSS·h), falling in the high end of the typical range reported in the technical literature (i.e., Fan et al, 1996 ; Harremoes and Sinkjaer, 1995 ; Muller et al, 1995 ). In any case, the results from the present study seem to suggest that differences in nitrification activity are indeed associated with mixed liquors developed in conventional and membrane‐assisted EBPR processes.…”

Section: Resultsmentioning

confidence: 68%

Comparison of Nitrification Rates in Conventional and Membrane‐Assisted Biological Nutrient Removal Processes

Monti¹,

Hall²

2008

Water Environment Research

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A membrane-assisted and a conventional activated sludge system, both operated in an enhanced biological phosphorus removal (EBPR) mode and under identical operating conditions, were studied to investigate the effect of the membrane solids-liquid separation on nitrification activity. Both the membrane EBPR (MEBPR) and conventional EBPR (CEBPR) processes achieved stable and complete removal of ammoniumnitrogen from the influent wastewater. However, when the intrinsic nitrification activity was assessed in offline batch tests, the CEBPR mixed liquor exhibited 15 to 75% greater nitrification potential than the MEBPR counterpart. These results were further validated by monitoring nitrification rates of conventional mixed liquor as it evolved toward a membrane mixed liquor. It was also demonstrated that the larger aerobic mass fraction of the MEBPR system could not be the only factor influencing the reduced intrinsic nitrification rate. The present study strongly suggests that the presence of a membrane solids-liquid separation per se may be sufficient to alter the nitrification kinetics of an EBPR mixed liquor and that this possibility should be considered in arriving at an appropriate process design. Water Environ. Res., 80, 497 (2008).

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Section: Resultsmentioning

confidence: 68%

Comparison of Nitrification Rates in Conventional and Membrane‐Assisted Biological Nutrient Removal Processes

Monti¹,

Hall²

2008

Water Environment Research

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“…They are well above the guide number (0.5 mg/L) recommended par (WHO, 1973). Also, these values considerably exceeded those of the work performed by Harremoës and Sinkjaer (1995). In term of orthophosphate, the concentration registered varies on average from 8.2 to 34.4 mg/L (Table 1).…”

Section: Resultsmentioning

confidence: 76%

Physicochemical evaluation of wastewater from the main sewer in Abidjan City

Wolfgang¹,

Mambo²,

Bernard³

et al. 2013

J. Ecol. Nat. Environ.

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In many parts of the world, health problems have often been caused by untreated wastewater. The objective of this study was to determine the pollution level of wastewater in Abidjan city and to evaluate their impact on marine environment. Thus, wastewater samples were collected and analyzed according to French Association of Standardization (FANOR). The results showed that the values of these parameters are ranged on average between 14500 and 18500 mg/L for Biological Oxygen Demand (BOD 5), between 36000 and 41800 mg/L for Carbon Oxygen Demand (COD) and between 75 and 145.5 mg/L for Suspended Matters (SM). All these values are beyond World Health Organization recommendations for wastewater discharge. However, the analysis of the ratios between the COD and BOD 5 of the different effluents showed that it is ranged on average between 1.44 and 2.60. That means that wastewaters have a domestic character and are therefore easily biodegradable. So, the government should build a sewage treatment plant in Abidjan city to minimize health and environmental risks.

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“…The influence of COD/N ratio on the system nitrification capacity can be quantified by means of nitrification rate or nitrifying biomass fraction [26]. Harremoës and Sinkjaer [27] reported an increase in autotrophic biomass fraction from 1.5 to 2% when the influent COD/N ratio decreased from 3.4 to 2.6 g COD g N -1 , while Carrera et al [26] found that a nitrification rate at 25°C was between 0.14 and 0.029 g NH 4 + -N g VSS -1 per day, with influent COD/N ratio of 0.71 and 3.4 g COD g N -1 respectively. pH is also a key operation parameter on the nitrification process.…”

Section: The Interaction Effects Of Srt and T F On The Cod Removalmentioning

confidence: 99%

The effects of SRT, OLR and feed temperature on the performance of membrane bioreactor treating high strength municipal wastewater

Birima

Noor

Mohammed

et al. 2009

Desalination and Water Treatment

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2009) The effects of SRT, OLR and feed temperature on the performance of membrane bioreactor treating high strength municipal wastewater, Desalination and Water Treatment, 7:1-3, 275-284To link to this article: http://dx. ab s t r ac tThe effects, of sludge retention time (SRT), feed temperature (T f ) and organic loading rate (OLR) on submerged membrane bioreactor (SMBR) performance were studied using hollow fibers (nominal pore size 0.4 µm) immersed in an aeration tank. A synthetic wastewater representative of high strength municipal wastewater was used in the study. Ten experimental runs were carried out using full factorial design with three factors and three levels (low, medium and high). These levels were 25, 30 and 35 days for SRT, 20, 30 and 40°C for T f and 1.73, 4.03 and 6.82 kg COD/m 3 d for OLR. Variation of OLR, SRT and T f affected the biomass development significantly. The higher OLR trials resulted in higher MLVSS/MLSS ratio and also higher increasing rate of MLSS (d(MLSS)/ (dt)). For the low level OLR trials MLVSS/MLSS ratio varied between 75.3 and 82.3% and d(MLSS)/(dt) from 87.5 to 297.3 mg/l.d, whereas, for the high OLR trials they varied between 80.4 and 83.7% and 1355.4-2120.1 mg/l.d respectively. For the higher OLR, a higher aeration rate was applied to fulfill the DO demand. Therefore, for the low level OLR trials, the aeration rate and the DO were varied from 6 to 12 m 3 /m 2 membrane area per hour and from 3.7 to 5.7 mg/l, respectively, whilst for the high OLR trials they varied from 6 to 18 m 3 /m 2 membrane area/h and from 0.9 to 4.4 mg/l respectively. The permeate COD and NH 3 -N under different operating conditions varied from 0 to 32 mg/l, and from 0.004 to 0.856 mg/l, respectively. The interaction effects of SRT and T f on COD removal efficiency was found to be insignificant. Increasing OLR did not affect COD removal. The optimum removal efficiency of ammonia nitrogen for the low and high strength wastewater was obtained at operating conditions of high SRT and low T f . The pH increased significantly in the aeration tank and the increase was well correlated with the feed pH (r 2 = 0.8336 for low OLR and 0.9106 for high OLR).

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Kinetic interpretation of nitrogen removal in pilot scale experiments

Cited by 32 publications

References 3 publications

Comparison of Nitrification Rates in Conventional and Membrane‐Assisted Biological Nutrient Removal Processes

Comparison of Nitrification Rates in Conventional and Membrane‐Assisted Biological Nutrient Removal Processes

Physicochemical evaluation of wastewater from the main sewer in Abidjan City

The effects of SRT, OLR and feed temperature on the performance of membrane bioreactor treating high strength municipal wastewater

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