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Comparison of Simultaneous Nitrification and Denitrification for Three Different Reactors.

Khanitchaidecha W, Nakaruk A, Koshy P, Futaba K - Biomed Res Int (2015)

Bottom Line: 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.Under intermittent aeration, nitrification and denitrification occurred simultaneously in the aerobic and anaerobic periods.Moreover, internal carbon was consumed efficiently for denitrification.

View Article: PubMed Central - PubMed

Affiliation: Department of Civil Engineering, Faculty of Engineering, Naresuan University, Thailand ; Centre of Excellence for Innovation and Technology for Water Treatment, Naresuan University, Thailand.

ABSTRACT
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.

No MeSH data available.


Related in: MedlinePlus

(a) Nitrogen removal efficiency and (b) nitrogen profile of MSR.
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fig4: (a) Nitrogen removal efficiency and (b) nitrogen profile of MSR.

Mentions: Since the competitive microorganisms had faster growth rate than the nitrifying and denitrifying microorganisms, the competitive microorganisms grew and became a suspended sludge in the anaerobic rector. At day 25, the concentration of the suspended sludge in the anaerobic reactor was ~100 mg/L. From Figure 4(b), the reduction of NH4-N from 40 mg/L to 0.5 mg/L and the increase in NO3-N to approximately 35 mg/L in the aerobic stage reveal that nitrification was the dominant process. In the meanwhile, the decrease in NO3-N in the anaerobic stage shows that only denitrification occurred. The nitrification and denitrification rates of the MSR were ~0.20 and 0.05 mg/L-min, respectively.


Comparison of Simultaneous Nitrification and Denitrification for Three Different Reactors.

Khanitchaidecha W, Nakaruk A, Koshy P, Futaba K - Biomed Res Int (2015)

(a) Nitrogen removal efficiency and (b) nitrogen profile of MSR.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4562362&req=5

fig4: (a) Nitrogen removal efficiency and (b) nitrogen profile of MSR.
Mentions: Since the competitive microorganisms had faster growth rate than the nitrifying and denitrifying microorganisms, the competitive microorganisms grew and became a suspended sludge in the anaerobic rector. At day 25, the concentration of the suspended sludge in the anaerobic reactor was ~100 mg/L. From Figure 4(b), the reduction of NH4-N from 40 mg/L to 0.5 mg/L and the increase in NO3-N to approximately 35 mg/L in the aerobic stage reveal that nitrification was the dominant process. In the meanwhile, the decrease in NO3-N in the anaerobic stage shows that only denitrification occurred. The nitrification and denitrification rates of the MSR were ~0.20 and 0.05 mg/L-min, respectively.

Bottom Line: 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.Under intermittent aeration, nitrification and denitrification occurred simultaneously in the aerobic and anaerobic periods.Moreover, internal carbon was consumed efficiently for denitrification.

View Article: PubMed Central - PubMed

Affiliation: Department of Civil Engineering, Faculty of Engineering, Naresuan University, Thailand ; Centre of Excellence for Innovation and Technology for Water Treatment, Naresuan University, Thailand.

ABSTRACT
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.

No MeSH data available.


Related in: MedlinePlus