Comparison of aerobic and anoxic phosphorus uptake in ndbepr systems (uct and enbnras)

Vermande, Stephanie; Sötemann, SW; Soriano, G. Aguilera; Wentzel, M. C.; Audic, J. M.; Ekama, George A.

doi:10.2166/wst.2002.0587

Cited by 15 publications

(4 citation statements)

References 6 publications

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“…In ENBNRAS systems, significant anoxic P uptake was observed (> 37%) with similar reductions in the ratios above, 1.1-2.8, 0.06-0.08 and 0.012-0.017 respectively, with f XBG,P in the range of 0.1-0.28 (Hu, 2001). By operating a UCT (conventional internal nitrification) BNRAS system in parallel with the external nitrification BNRAS system of Sotemann et al (2000), Vermande et al (2000) confirmed the reduced BEPR with significant anoxic/aerobic P uptake compared with that with predominantly aerobic P uptake.…”

Section: Bepr Behaviour In Systems With Anoxic P Uptakementioning

confidence: 68%

The significance of denitrifying polyphosphate accumulating organisms in biological nutrient removal activated sludge systems

Wentzel

Ekama

2002

Water Science and Technology

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In this paper the advantages and disadvantages of denitrifying PAOs (polyphosphate accumulating organisms) in conventional BNRAS (biological nutrient removal activated sludge) and external nitrification BNRAS (ENBNRAS) systems are evaluated, with experimental data exhibiting a range of anoxic P uptake from low (<10%) to very high (>60%). The results indicate that the specific denitrification rate of the PAOs on internally stored PHB COD is about 1/5th of that of the "ordinary" heterotrophic organisms on SBCOD, and the PAOs contribute little (maximum 20%) to the denitrification in BNRAS systems even when the anoxic P uptake is high (60% of the total P uptake). Considering the unpredictable nature of anoxic P uptake and the reduction in BEPR it causes compared with aerobic P uptake BEPR, it is concluded that anoxic P uptake does not add a significant advantage to the BNR system.

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Section: Bepr Behaviour In Systems With Anoxic P Uptakementioning

confidence: 68%

The significance of denitrifying polyphosphate accumulating organisms in biological nutrient removal activated sludge systems

Wentzel

Ekama

2002

Water Science and Technology

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“…This is confirmed in our investigation, but the ENBNRAS system does not have to stimulate anoxic P-uptake BEPR. In fact, it was observed that anoxic P-uptake BEPR is significantly lower (roughly two-thirds) compared with aerobic P-uptake BEPR for the same influent RBCOD concentration (Hu et al, 2002a(Hu et al, , 2002bVermande et al, 2002).…”

Section: Opportunities For Implementation Of Enbnras Systems and Systmentioning

confidence: 98%

Experimental investigation of the external nitrification biological nutrient removal activated sludge (ENBNRAS) system

Sötemann

Moodley

et al. 2003

Biotech & Bioengineering

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A systematic lab-scale experimental investigation is reported for the external nitrification (EN) biological nutrient removal (BNR) activated sludge (ENBNRAS) system, which is a combined fixed and suspended medium system. The ENBNRAS system was proposed to intensify the treatment capacity of BNR-activated sludge (BNRAS) systems by addressing two difficulties often encountered in practice: (a) the long sludge age for nitrification requirement; and (b) sludge bulking. In the ENBNRAS system, nitrification is transferred from the aerobic reactor in the suspended medium activated sludge system to a fixed medium nitrification system. Thus, the sludge age of the suspended medium activated sludge system can be reduced from 20 to 25 days to 8 to 10 days, resulting in a decrease in reactor volume per ML wastewater treated of about 30%. Furthermore, the aerobic mass fraction can also be reduced from 50% to 60% to <30% and concommitantly the anoxic mass fraction can be increased from 25% to 35% to >55% (if the anaerobic mass fraction is 15%), and thus complete denitrification in the anoxic reactors becomes possible. Research indicates that both the short sludge age and complete denitrification could ameliorate anoxic aerobic (AA) or low food/microorganism (F/M) ratio filamentous bulking, and hence reduce the surface area of secondary settling tanks or increase the treatment capacity of existing systems. The lab-scale experimental investigations indicate that the ENBNRAS system can obtain: (i) very good chemical oxygen demand (COD) removal, even with an aerobic mass fraction as low as 20%; (ii) high nitrogen removal, even for a wastewater with a high total kjeldahl nitrogen (TKN)/COD ratio, up to 0.14; (iii) adequate settling sludge (diluted sludge volume index [DSVI] <100 mL/g); and (iv) a significant reduction in oxygen demand.

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“…This test was divided into two parts: (i) Anaerobic phosphorus release pretreatment: Previous researchers found that the phosphorus contained in the biomass could be released as soluble phosphate under anaerobic conditions, whereas uptake could occur under aerobic conditions. Further, prior anaero- [24,25]. Consequently, the biofilm was pretreated under anaerobic condition since it might be phosphate saturated after a period of operation.…”

Section: Examination Of the Biofilms Phosphorus Storage Capacitymentioning

confidence: 99%

Development of an Advanced Biological Treatment System Using Bioaugmentation Technology for the Treatment of Eutrophic Drinking Water Resources

Meng

Zhao

Lü³

et al. 2009

CLEAN Soil Air Water

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Drinking water supplies around the world are increasingly at risk from eutrophication. However, many of the technologies developed in the laboratory to control water eutrophication have not been successfully applied in situ. To explore an in situ water treatment strategy for treating eutrophic drinking water resources, a laboratory system simulating a real river way was designed and used to treat raw eutrophic drinking water. The system included several removable modules and bioaugmentation technology to ensure the formation and maintenance of the biofilm, and enhance treatment efficiency. During operation of the system, the biofilm was successfully formed and maintained under a continuous hydraulic shock loading up to 14.4 m 3 m -2 d -1 , and the average removal rates of chlorophyll a, TN, and TP were 83.85, 53.44 and 70.78%, respectively. The biofilm had a high phosphorus storage capacity, even when phosphorus loading increased to 15 -20 mg/L, the removal was constant at around 10 mg/L. Moreover, PCR-DGGE analysis demonstrated that the bioaugmented bacteria, including Flavobacterium and Pseudomonas, successfully colonized the biofilm inside the system. Furthermore, the original community of microorganisms from the raw drinking water was maintained, which is an important aspect of the in situ treatment process. In conclusion, this strategy successfully treated raw eutrophic drinking water in the simulated river way. Its efficacy, low operation cost and application to water safety make this system a promising prospect for controlling eutrophication of drinking water resources.

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Comparison of aerobic and anoxic phosphorus uptake in ndbepr systems (uct and enbnras)

Cited by 15 publications

References 6 publications

The significance of denitrifying polyphosphate accumulating organisms in biological nutrient removal activated sludge systems

The significance of denitrifying polyphosphate accumulating organisms in biological nutrient removal activated sludge systems

Experimental investigation of the external nitrification biological nutrient removal activated sludge (ENBNRAS) system

Development of an Advanced Biological Treatment System Using Bioaugmentation Technology for the Treatment of Eutrophic Drinking Water Resources

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