Multistage wastewater treatment using separated storage driven denitrification and nitrification biofilms

The feasibility of combining a previously reported storage driven denitrification biofilm, where 80% of influent acetate can be converted to poly-beta-hydroxybutyrate (PHB), with a suitable nitrification reactor, either submerged or trickling filter design, to achieve complete biological nitrogen removal was tested. The reactor system showed the potential of complete biological nitrogen removal of waste streams with a C/N ratio as low as 3.93 kg COD/kg N-NH3 at an overall nitrogen removal rate of 1.1 mmole NH3/L/h. While the efficiency and the rates of nitrogen removal were higher than what is observed in traditional or simultaneous nitrification and denitrification (SND) systems, there were two problems that require further development: (a) the incomplete draining of the reactor caused ammonia retention and release in the effluent, limiting the overall N-removal and (b) pH drifts in the nitrification step slowed down the rate of nitrification if not corrected by appropriate pH adjustment or buffering.

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Partial Nitrification in Microaerobic Tank of “Anoxic-Anaerobic- Microaerobic-Aerobic (A2O2)” Biological Nitrogen Removal Process

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.295-298.1039 ◽

2013 ◽

Vol 295-298 ◽

pp. 1039-1044 ◽

Cited By ~ 1

Author(s):

Jian Lei Gao ◽

Bing Nan Lv ◽

Yi Xin Yan ◽

Jian Ping Wu

Keyword(s):

Nitrogen Removal ◽

Removal Rate ◽

Pilot Scale ◽

Partial Nitrification ◽

Biological Nitrogen Removal ◽

Nitrogenous Fertilizer ◽

Removal Process ◽

Batch Tests ◽

N Removal ◽

Biological Nitrogen

The pilot-scale Anoxic-Anaerobic-Microaerobic-Aerobic (A2O2) biological nitrogen removal process was used to treat the wastewater from nitrogenous fertilizer production with C/N ratio of 1~2. Batch tests were conducted to investigate the patial nitrification using the activated sludge from the microaerobic tank rich in nitrite bacteria as the experimental object. Results showed that 95% removal efficiency of NH3-N could be obtained with the HRT of 30 h. The SVI affected the NH3-N removal rate and the optimal SVI was 106 mL/g. The ORP was well correlated with the logarithm of NH3-N concentration with the linear regression equation of y=-57.233x+3.308. Moreover, the kinetic model for partial nitrification was determined as v=4.762s/(9.86+s).

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Effect of temperature and NH4+-N influent concentration on the nitrogen removal effect of luffa cylindrical sponge carrier sequencing batch biofilm reactor

E3S Web of Conferences ◽

10.1051/e3sconf/202021803033 ◽

2020 ◽

Vol 218 ◽

pp. 03033

Author(s):

Yafeng Li ◽

Jianbo Wu ◽

Yuemeng Bai ◽

Ning Feng

Keyword(s):

Nitrogen Removal ◽

Removal Rate ◽

Domestic Sewage ◽

Biofilm Reactor ◽

Effect Of Temperature ◽

Biological Nitrogen Removal ◽

Treatment Rate ◽

Influent Concentration ◽

Sequencing Batch Biofilm Reactor ◽

Biological Nitrogen

In order to improve the efficiency of biological nitrogen removal, the experiment used the luffa cylindrical sponge carrier sequencing batch biofilm reactor to treat domestic sewage, and it studied the temperature on the removal effect of TN in the sewage in the reactor and the changes of various types of nitrogen. The results showed that the TN treatment rate of the luffa cylindrical sponge carrier SBBR reached the peak at 30 °C, the removal rate was 82.25%, indicating that the luffa cylindrical sponge carrier SBBR is very suitable for the removal of nitrogen from domestic sewage.

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Isolation and Characteristics of Heterotrophic Nitrification-Aerobic Denitrification Bacterium, Bacillus cereus X7 at High Salinity

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.864-867.111 ◽

2013 ◽

Vol 864-867 ◽

pp. 111-114 ◽

Cited By ~ 2

Author(s):

Ru Lei Yao ◽

Li Na Qiu ◽

Wei Wei Zhang ◽

Ai Jun Gong ◽

Zi Yu Wang ◽

...

Keyword(s):

Bacillus Cereus ◽

Nitrogen Removal ◽

High Salinity ◽

Removal Rate ◽

Aerobic Denitrification ◽

16S Rdna Sequence ◽

16S Rdna Sequence Analysis ◽

N Removal ◽

Nacl Concentration ◽

Biological Nitrogen

Biological nitrogen removal has been focused on in wastewater treatment field recently. A strain X7 was isolated from the sediment of pickle foodstuff wastewater. Based on its 16S rDNA sequence analysis, X7 was identified as Bacillus cereus. At NaCl concentration of 20 g/L, NH4+-N removal rate achieved 99.18%, when NO2--N and NO3--N removal rates were 77.24% and 68.6%, respectively. When NaCl concentration ranged from 0 to 40 g/L, the removal rate of NH4+-N was more than 97.59%. Therefore, due to the high nitrogen removal rate and excellent salt tolerance, Bacillus cereus X7 had a broad application prospect in the biodenitrification of brine wastewater.

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Effects of HRT on biological nitrogen removal in single-stage autotrophic process

Applied Environmental Biotechnology ◽

10.18063/aeb.2016.02.003 ◽

2016 ◽

Vol 1 (2) ◽

pp. 18 ◽

Cited By ~ 2

Author(s):

Hong Liang ◽

Shutong Liu ◽

Xue Li ◽

Xueying Sun ◽

Dawen Gao

Keyword(s):

Removal Efficiency ◽

Nitrogen Removal ◽

Removal Rate ◽

Batch Reactor ◽

Ammonia Removal ◽

Nitrogen Loading ◽

Single Stage ◽

Biological Nitrogen Removal ◽

External Circulation ◽

Biological Nitrogen

An external circulation Sequencing Batch Reactor (ecSBR) was used to study the efficiency of nitrogen removal by autotrophic microbe. With gradually reducing the dissolved oxygen (DO) concentration from 1.2 mg/L to 0.04 mg/L, the single-stage autotrophic biological nitrogen removal (sABNR) process could be operated stably. After removing the aeration, the process could still stay sABNR stably, and the concentration of NH4+-N was 0.9 mg/L in effluent, the rate of nitrate (produced)/NH4+-N (removed) was in the range of 0.12–0.40. The results showed that the concentration of NH4+-N in effluent was 0.8, 0.8 and 9.9 mg/L with the hydraulic retention time (HRT) at 8 h, 6 h and 4 h respectively, the removal efficiency of ammonia were 98.2%, 98.1% and 73.6% respectively. The rate of nitrate (produced)/NH4+-N (consumed) was 0.05 at HRT 6 h, and the nitrogen loading rate (NLR) and nitrogen removal rate (NRR) were 169.7 and 129.7 g/m3/d, the removal efficiency of total nitrogen (TN) was 77.5%. In conclusion the optimal HRT was 6 h instead of 8 h or 4 h enough for ammonia removal without causing energy wastage.

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A two-sludge system for simultaneous biological C, N and P removal via the nitrite pathway

Water Science & Technology ◽

10.2166/wst.2011.398 ◽

2011 ◽

Vol 64 (5) ◽

pp. 1142-1147 ◽

Cited By ~ 11

Author(s):

M. Marcelino ◽

D. Wallaert ◽

A. Guisasola ◽

J. A. Baeza

Keyword(s):

Nitrogen Removal ◽

Ph Control ◽

Biological Nitrogen Removal ◽

Batch Reactors ◽

Sequencing Batch Reactors ◽

Major Drawback ◽

Process Implementation ◽

N Removal ◽

Biological Nitrogen ◽

P Removal

Nitrogen removal via the nitrite pathway results in significant savings in both aeration costs and COD requirements for denitrification when compared to the conventional biological nitrogen removal process. Implementation of the nitrite pathway for simultaneous C/N/P removal in a single sludge system has a major drawback: the aeration phase disfavours denitrifying phosphorus removal. A possible configuration to overcome this issue is the utilisation of a two-sludge system where autotrophic and heterotrophic populations are physically separated. This paper experimentally demonstrates the feasibility of a nitrite-based two-sludge system with sequencing batch reactors (SBR) for the treatment of urban wastewater: a heterotrophic SBR with denitrifying PAOs for P removal and an aerobic SBR for N removal. Partial nitrification was attained in the autotrophic SBR so that shortcut biological nitrogen removal was achieved by using the anoxic dephosphatation activity of DPAOs. Finally, the effect of operating this system without pH control was studied using different influent pH values (pH = 6.8, 7.5 and 8.2) and, despite some efficiency lost due to the pH fluctuations, the system was able to remove most of the C, N and P present in the wastewater.

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Effects of Alternating Oxic-Anoxic Model on Nitrite Accumulation in Biological Nitrogen Removal System

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1030-1032.422 ◽

2014 ◽

Vol 1030-1032 ◽

pp. 422-425

Author(s):

Er Long Jiao ◽

Chun Di Gao ◽

Hao Li ◽

Wei Xiao Wang ◽

Shi Xin Fan

Keyword(s):

Total Nitrogen ◽

Nitrogen Removal ◽

Removal Rate ◽

Ammonia Nitrogen ◽

Biological Nitrogen Removal ◽

Nitrite Accumulation ◽

Total Nitrogen Removal ◽

Cod Removal Rate ◽

Biological Nitrogen ◽

Removal System

The effects of chemical oxygen demand (COD), ammonia nitrogen, total nitrogen removal rates and nitrite accumulation are investigated under alternating oxic-anoxic model in biological nitrogen removal system——sequencing batch reactor (SBR). The system operational effect was studied by analyzing pollutants removal and nitrite accumulation changes. The results showed that the ammonium nitrogen removal rate increased gradually and reached 60% at last. The average removal rate of ammonia nitrogen was 50.2%. The average total nitrogen removal rate was 31.0% due to the low ammonia nitrogen removal and the low carbon in the inflow. The average COD removal rate was 41.7%, finally the COD removal rate reached near 60%. The average nitrite accumulation rate was 68.71%. The alternating oxic-anoxic model reached stable nitrite accumulation.

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