Advanced nitrogen removal from municipal wastewater via two-stage partial nitrification-simultaneous anammox and denitrification (PN-SAD) process

Conventional biological nutrient removal processes in municipal wastewater treatment plants are energy-consuming, with oxygen supply accounting for 45–75% of the energy expenditure. Many recent studies examined the implications of the anammox process in sidestream wastewater treatment to reduce energy consumption, however, the process did not successfully remove nitrogen in mainstream wastewater treatment with relatively low ammonia concentrations. In this study, blue light was applied as an inhibitor of nitrite-oxidizing bacteria (NOB) in a photo sequencing batch reactor (PSBR) containing raw wastewater. This simulated a biological nitrogen removal system for the investigation of its application potential in nitrite accumulation and nitrogen removal. It was found that blue light illumination effectively inhibited NOB rather than ammonia-oxidizing bacteria due to their different sensitivity to light, resulting in partial nitrification. It was also observed that the NOB inhibition rates were affected by other operational parameters like mixed liquor suspended solids (MLSS) concentration and sludge retention time (SRT). According to the obtained results, it was concluded that the process efficiency of partial nitrification and anammox (PN/A) could be significantly enhanced by blue light illumination with appropriate MLSS concentration and SRT conditions.

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Two-stage partial nitrification-Anammox process for nitrogen removal from slaughterhouse wastewater: Evaluation of the nitrogen loading rate and microbial community analysis

Journal of Environmental Management ◽

10.1016/j.jenvman.2021.113214 ◽

2021 ◽

Vol 296 ◽

pp. 113214

Author(s):

Natália Carolina Silveira ◽

Guilherme Henrique Duarte Oliveira ◽

Márcia Helena Rissato Zamariolli Damianovic ◽

Eugenio Foresti

Keyword(s):

Microbial Community ◽

Nitrogen Removal ◽

Loading Rate ◽

Community Analysis ◽

Nitrogen Loading ◽

Microbial Community Analysis ◽

Partial Nitrification ◽

Two Stage ◽

Slaughterhouse Wastewater ◽

Anammox Process

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Upflow packed bed Anammox reactor used in two-stage deammonification of sludge digester effluent

Water Science & Technology ◽

10.2166/wst.2018.322 ◽

2018 ◽

Vol 78 (9) ◽

pp. 1843-1851 ◽

Cited By ~ 3

Author(s):

İ. Çelen-Erdem ◽

E. S. Kurt ◽

B. Bozçelik ◽

B. Çallı

Keyword(s):

Removal Efficiency ◽

Nitrogen Removal ◽

Municipal Wastewater ◽

Removal Rate ◽

Treatment Plant ◽

Packed Bed ◽

Municipal Wastewater Treatment ◽

Two Stage ◽

N Removal ◽

Total Nitrogen Removal

Abstract The sludge digester effluent taken from a full scale municipal wastewater treatment plant (WWTP) in Istanbul, Turkey, was successfully deammonified using a laboratory scale two-stage partial nitritation (PN)/Anammox (A) process and a maximum nitrogen removal rate of 1.02 kg N/m3/d was achieved. In the PN reactor, 56.8 ± 4% of the influent NH4-N was oxidized to NO2-N and the effluent nitrate concentration was kept below 1 mg/L with 0.5–0.7 mg/L of dissolved oxygen and pH of 7.12 ± 12 at 24 ± 4°C. The effluent of the PN reactor was fed to an upflow packed bed Anammox reactor where high removal efficiency was achieved with NO2-N:NH4-N and NO3-N:NH4-N ratios of 1.32 ± 0.19:1 and 0.22 ± 0.10:1, respectively. The results show that NH4-N removal efficiency up to 98.7 ± 2.4% and total nitrogen removal of 87.7 ± 6.5% were achieved.

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Advanced nitrogen removal via nitrite from municipal wastewater in a pilot-plant sequencing batch reactor

Water Science & Technology ◽

10.2166/wst.2009.304 ◽

2009 ◽

Vol 59 (12) ◽

pp. 2371-2377 ◽

Cited By ~ 6

Author(s):

Q. Yang ◽

X. H. Liu ◽

Y. Z. Peng ◽

S. Y. Wang ◽

H. W. Sun ◽

...

Keyword(s):

Carbon Source ◽

Process Control ◽

Removal Efficiency ◽

Nitrogen Removal ◽

Pilot Plant ◽

Sequencing Batch Reactor ◽

Municipal Wastewater ◽

Batch Reactor ◽

Nitrite Accumulation ◽

Advanced Nitrogen Removal

To obtain economically sustainable wastewater treatment, advanced nitrogen removal from municipal wastewater and the feasibility of achieving and stabilizing short-cut nitrification and denitrification were investigated in a pilot-plant sequencing batch reactor (SBR) with a working volume of 54 m3. Advanced nitrogen removal, from summer to winter, with effluent TN lower than 3 mg/L and nitrogen removal efficiency above 98% was successfully achieved in pulsed-feed SBR. Through long-term application of process control in pulsed-feed SBR, nitrite accumulation reached above 95% at normal temperature of 25°C. Even in winter, at the lowest temperature of 13°C, nitrite was still the end production of nitrification and nitrite accumulation was higher than 90%. On the basis of achieving advanced nitrogen removal, short-cut nitrification and denitrification was also successfully achieved. Compare to the pulse-feed SBR with fixed time control, the dosage of carbon source and energy consumption in pulsed-feed SBR with process control were saved about 30% and 15% respectively. In pulsed-feed SBR with process control, nitrogen removal efficiency was greatly improved. Moreover, consumption of power and carbon source was further saved.

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