Biological nitrogen removal from industrial wastewater discharged from metal recovery processes

2001 ◽  
Vol 44 (2-3) ◽  
pp. 171-180 ◽  
Author(s):  
A. Hirata ◽  
Y. Nakamura ◽  
S. Tsuneda
Keyword(s):  
Total Nitrogen ◽  
Residence Time ◽  
Nitrogen Removal ◽  
Nitrogen Concentration ◽  
Industrial Wastes ◽  
Biological Nitrogen Removal ◽  
Hydraulic Residence Time ◽  
Anaerobic Reactor ◽  
Aerobic Reactor ◽  
Biological Nitrogen

The wastewater generated from the processes of recovering precious metals from industrial wastes contains high concentrations of acids and alkalis such as nitric acid and aqueous ammonia, and of salts such as sodium chloride and sodium sulfate. Biological nitrogen removal from this wastewater was attempted by using a circulating bioreactor system equipped with an anaerobic packed bed and an aerobic three-phase fluidized bed. As a result of acclimating microorganisms with change of the hydraulic residence time, this system effectively removed nitrogen from diluted wastewater (T-N: from 2,000 to 4,000 g/m3), such that the total nitrogen concentration in the effluent met the sewage discharge control criteria in Japan (240 g/m3). The removal ratio of total nitrogen was 90% to 98% and that of ammonia was 80% to 92%. In addition, the characteristic equations for biological treatment were applied to this system on the assumption that both reactions of denitrification in the anaerobic reactor and nitrification in the aerobic reactor can be approximated to a first-order reaction. This simplified approach successfully led to a new analytical method for simulating the optimum volume ratio of anaerobic reactor to aerobic reactor for minimizing the total hydraulic residence time.

A membrane bioreactor for an innovative biological nitrogen removal process

2010 ◽  
Vol 61 (3) ◽  
pp. 671-676 ◽  
Author(s):  
W. Chen ◽  
F. Y. Sun ◽  
X. M. Wang ◽  
X. Y. Li
Keyword(s):  
Total Nitrogen ◽  
Nitrogen Removal ◽  
Membrane Bioreactor ◽  
Loading Rate ◽  
Nitrogen Loading ◽  
Synthetic Wastewater ◽  
Biological Nitrogen Removal ◽  
Laboratory System ◽  
Working Volume ◽  
Biological Nitrogen

A hybrid system has been developed for biological nitrogen removal through nitrification-denitrification. The system includes an aerobic tank and an anoxic tank with an intermediate sludge settler connected to a membrane bioreactor (MBR) with a submerged 0.4 μm hollow-fiber membrane module. The laboratory system has a total working volume of 6.5 L treating a glucose-based synthetic wastewater. The experimental results demonstrate that the new process is highly effective for simultaneous organic and nitrogen removal. During the stationary operation, a sludge SS (suspended solids) concentration of 6 g/L or higher can be maintained in the reactors. The system has a COD (chemical oxygen demand) loading rate of up to 2,100 mg/L-d and a total nitrogen loading rate of up to 170 mg N/L-d. More than 95% COD can be degraded, and the total nitrogen removal efficiency can be 90% or higher as the nitrogen is reduced from 100 to around 7.5 mg/L. A high quality effluent is produced with a SS of less than 1 mg/L. With the MBR, organic degradation, nitrogen removal and sludge-liquid separation can be well achieved within a short HRT of about 10 hr.

Conventional and Advanced Technologies for Biological Nitrogen Removal in Europe

2009 ◽  
Vol 4 (1) ◽  
Author(s):  
K.-H. Rosenwinkel ◽  
M. Beier ◽  
L.-C. Phan ◽  
P. Hartwig
Keyword(s):  
Nitrogen Removal ◽  
Ammonia Oxidation ◽  
Nitrogen Concentration ◽  
Design Guidelines ◽  
Biological Nitrogen Removal ◽  
Reaction Volume ◽  
Specific Reaction ◽  
Advanced Technologies ◽  
Biological Nitrogen ◽  
The Eu

Within the last decades in Europe, the EU standards have become stricter for the nitrogen concentration in effluent and the nitrogen removal performance in WWTP; many methods and strategies to improve the efficiency of WWTP have been developed. This paper will give an overview of the conventional technologies as well as advanced technologies using bio-augmentation, partial nitrification, and fully autotrophic ammonia oxidation. Compared to the German design guidelines A 131, in which the specific reaction volume is recommended from 150 to 250 l/PE, the optimized specific reaction volume of about 120 l/PE is significantly smaller. Furthermore, the bio-augmentation technologies with integrated sludge liquor treatment can reduce the specific reaction volume up to 50 l/PE.

A novel sludge minimized biological nitrogen removal process for saline sewage treatment

2009 ◽  
Vol 59 (10) ◽  
pp. 1893-1899 ◽  
Author(s):  
W. L. Tsang ◽  
J. Wang ◽  
H. Lu ◽  
S. Li ◽  
G. H. Chen ◽  
...  
Keyword(s):  
Sulfate Reduction ◽  
Removal Efficiency ◽  
Total Nitrogen ◽  
Nitrogen Removal ◽  
Sewage Treatment ◽  
Biological Nitrogen Removal ◽  
Autotrophic Denitrification ◽  
Removal Process ◽  
Total Nitrogen Removal ◽  
Biological Nitrogen

This study reports a lab-scale evaluation of a new biological nitrogen removal process for saline sewage treatment, namely a SANI process (Sulfate reduction, Autotrophic denitrification and Nitrification Integrated process). The experimental system consisted of an up-flow anaerobic bed for sulfate reduction, an anoxic filter for autotrophic denitrification using dissolved sulfide produced in the up-flow anaerobic bed and an aerobic filter for nitrification. The system successfully operated for more than 180 days with an overall organic carbon removal efficiency of 95%, in which, 82% removal was contributed by the up-flow anaerobic bed operating at a HRT of 6 h, and 13% removal by the anoxic filter. An average COD removed /sulfate removed ratio was found to be 0.76 gCOD/gSO4 or 2.28 COD/gSO4-S further confirming that the organic removal was mainly achieved by the sulfate reduction. In terms of nitrogen removal efficiency, the SANI system was found sensitive to the recirculation rate between the anoxic filter and the aerobic filter. A recirculation rate of 3Q was found to be optimal for achieving 74% of the total nitrogen removal. It was confirmed that the autotrophic denitrification was a major contributor to the total nitrogen removal in the SANI system. Sulfur balance analysis indicated that both the accumulation of elementary sulfur in the biomass and the loss of hydrogen sulfide were trivial. During the entire operation period (330 days to date), no sludge was wasted from any reactors in this system. This was further confirmed by the biomass balance simulation results that low biomass yields of sulfate reducing bacteria, autotrophic denitrifiers and nitrifiers contribute to the zero excess sludge discharge.

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

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.

Organic carbon bioavailability: is it a good driver to choose the best biological nitrogen removal process?

2021 ◽  
pp. 147390
Author(s):  
Gabriela Bonassa ◽  
Alice Chiapetti Bolsan ◽  
Camila Ester Hollas ◽  
Bruno Venturin ◽  
Daniela Candido ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Nitrogen Removal ◽  
Biological Nitrogen Removal ◽  
Removal Process ◽  
Biological Nitrogen

Biological Nitrogen Removal From Domestic Wastewater

2011 ◽  
pp. 285-296
Author(s):  
M. Ruscalleda Beylier ◽  
M.D. Balaguer ◽  
J. Colprim ◽  
C. Pellicer-Nàcher ◽  
B.-J. Ni ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Domestic Wastewater ◽  
Biological Nitrogen Removal ◽  
Biological Nitrogen

scholarly journals Biological Nitrogen Removal in a Photosequencing Batch Reactor with an Algal-Nitrifying Bacterial Consortium and Anammox Granules

2016 ◽  
Vol 3 (4) ◽  
pp. 175-179 ◽  
Author(s):  
Nathan D. Manser ◽  
Meng Wang ◽  
Sarina J. Ergas ◽  
James R. Mihelcic ◽  
Arnold Mulder ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Batch Reactor ◽  
Bacterial Consortium ◽  
Biological Nitrogen Removal ◽  
Biological Nitrogen
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