Biological nitrogen removal in a step-feed CAST with real-time control treating municipal wastewater

2010 ◽  
Vol 61 (9) ◽  
pp. 2325-2332 ◽  
Author(s):  
Ma Juan ◽  
Peng Chengyao ◽  
Wang Li ◽  
Wang Shuying ◽  
Liu Yang ◽  
...  
Keyword(s):  
Carbon Source ◽  
Real Time ◽  
Nitrogen Removal ◽  
Municipal Wastewater ◽  
Removal Rate ◽  
Nitrification Rate ◽  
Real Time Control ◽  
Time Control ◽  
Characteristic Points ◽  
System Temperature

The performance of a 18 L step-feed cyclic activated sludge technology (CAST) combined with real-time control treating real municipal wastewater was evaluated. The operation strategies employed pH and oxidation reduction potential (ORP) as on-line control parameters, which can control the durations of oxic and anoxic phases flexibly. The obtained results showed that the studied process had achieved advanced and enhanced nitrogen removal by several phases of consecutive oxic/anoxic periods. Total nitrogen in effluent was lower than 2 mg/L and the average TN removal efficiency was higher than 98%, while only requiring small amount of external carbon source. Unexpected characteristic points in pH and ORP profiles denoting the depletion of nitrate were also observed during the last anoxic phase. Denitrification rate was found to be more dependent on the system temperature compared to nitrification rate. Moreover, a stable and efficient phosphorus removal rate above 90% was achieved by using step-feed strategy which enabled the influent carbon source to be fully used and the favourable condition for phosphorus releasing to be created during the anoxic phases.

Nitrogen Removal via Nitrite from Municipal Wastewater at Low Temperatures using Real-Time Control to Optimize Nitrifying Communities

2007 ◽  
Vol 41 (23) ◽  
pp. 8159-8164 ◽  
Author(s):  
Qing Yang ◽  
Yongzhen Peng ◽  
Xiuhong Liu ◽  
Wei Zeng ◽  
Takashi Mino ◽  
...  
Keyword(s):  
Real Time ◽  
Nitrogen Removal ◽  
Low Temperatures ◽  
Municipal Wastewater ◽  
Real Time Control ◽  
Time Control

Nitrogen Removal in a Real-Time Controlled Sequencing Batch Membrane Bioreactor

2010 ◽  
Vol 5 (3) ◽  
Author(s):  
Cheng-Nan Chang ◽  
Li-Ling Lee ◽  
Han-Hsien Huang ◽  
Ying-Chih Chiu
Keyword(s):  
Real Time ◽  
Nitrogen Removal ◽  
Membrane Bioreactor ◽  
Synthetic Wastewater ◽  
Real Time Control ◽  
Time Control ◽  
Cake Layer ◽  
On Line ◽  
Solid Liquid ◽  
Solid Liquid Separation

The performance of a real-time controlled Sequencing Batch Membrane Bioreactor (SBMBR) for removing organic matter and nitrogen from synthetic wastewater has been investigated in this study under two specific ammonia loadings of 0.0086 and 0.0045g NH4+-N gVSS−1 day−1. Laboratory results indicate that both COD and DOC removal are greater than 97.5% (w/w) but the major benefit of using membrane for solid-liquid separation is that the effluent can be decanted through the membrane while aeration is continued during the draw stage. With a continued aeration, the sludge cake layer is prevented from forming thus alleviating the membrane clogging problem in addition to significant nitrification activities observed in the draw stage. With adequate aeration in the oxic stage, the nitrogen removal efficiency exceeding 99% can be achieved with the SBMBR system. Furthermore, the SBMBR system has also been used to study the occurrence of ammonia valley and nitrate knee that can be used for real-time control of the biological process. Under appropriate ammonia loading rates, applicable ammonia valley and nitrate knee are detected. The real-time control of the SBMBR can be performed based on on-line ORP and pH measurements.

Development and Implementation of a Real-Time Control System for Nitrogen Removal Using OUR and ORP as End Points

2005 ◽  
Vol 44 (9) ◽  
pp. 3367-3373 ◽  
Author(s):  
Sebastià Puig ◽  
Lluís Corominas ◽  
M. Teresa Vives ◽  
M. Dolors Balaguer ◽  
Jesús Colprim ◽  
...  
Keyword(s):  
Control System ◽  
Real Time ◽  
Nitrogen Removal ◽  
Real Time Control ◽  
End Points ◽  
Time Control

Surrogate-Based Correlation Models in View of Real-Time Control of Ozonation of Secondary Treated Municipal Wastewater—Model Development and Dynamic Validation

2017 ◽  
Vol 51 (24) ◽  
pp. 14233-14243 ◽  
Author(s):  
Michael Chys ◽  
Wim T. M. Audenaert ◽  
Emma Deniere ◽  
Séverine Thérèse F. C. Mortier ◽  
Herman Van Langenhove ◽  
...  
Keyword(s):  
Real Time ◽  
Municipal Wastewater ◽  
Model Development ◽  
Real Time Control ◽  
Time Control ◽  
Correlation Models ◽  
Treated Municipal Wastewater

Enhanced nitrogen removal from nitrate-rich mature leachate via partial denitrification (PD)-anammox under real-time control

2019 ◽  
Vol 289 ◽  
pp. 121615 ◽  
Author(s):  
Zhong Wang ◽  
Liang Zhang ◽  
Fangzhai Zhang ◽  
Hao Jiang ◽  
Shang Ren ◽  
...  
Keyword(s):  
Real Time ◽  
Nitrogen Removal ◽  
Real Time Control ◽  
Time Control

Nitrogen Removal in Fixed-Bed Submerged Biofilters without Backwashing

1999 ◽  
Vol 40 (4-5) ◽  
pp. 142-152 ◽  
Author(s):  
R. Canziani ◽  
R. Vismara ◽  
D. Basilico ◽  
L. Zinni
Keyword(s):  
Carbon Source ◽  
Nitrogen Removal ◽  
Municipal Wastewater ◽  
Settling Tank ◽  
Fixed Bed ◽  
Organic Load ◽  
Bulk Liquid ◽  
Nitrification Rate ◽  
Recycle Rate ◽  
Hydrolysis Of

The paper reports the findings of four years of pilot-scale research on nitrogen removal in fixed-bed biofilters fed on real raw municipal wastewater. The plant was made of two fixed-bed biofilm reactors in series with an intermediate settling tank from which excess biomass from the first stage was discharged. The first filter was used for carbon removal either with oxygen or nitrates. The second filter was used for nitrification. The average nitrification rate at 20°C was 0.84 gNH4+-N m−2d−1 with 5 mg l−1 dissolved oxygen in the bulk liquid. Temperature dependence was calculated (rn = rn,20° 1,05T-20). The influent organic load strongly affected ammonia oxidation. If the organic loading exceeded 2.5 gCOD m−2 d−1 nitrification rate was reduced by 50%. Denitrification was performed by recycling nitrates back from the second filter and by using sewage itself as carbon source. Denitrification rate showed to be strongly dependent on temperature (rd = rd,20° 1.11T-20) and on the recycle rate. Hydrolysis of the colloidal COD fraction showed a similar dependence on both temperature and recycle rate. Therefore, it has been concluded that the hydrolysis of finely dispersed COD particles can be the limiting step of denitrification in the biofilter when real sewage is used as carbon source.

scholarly journals Real-time control strategy for nitrogen removal via nitrite in a SHARON reactor using pH and ORP sensors

2012 ◽  
Vol 47 (10) ◽  
pp. 1510-1515 ◽  
Author(s):  
J. Claros ◽  
J. Serralta ◽  
A. Seco ◽  
J. Ferrer ◽  
D. Aguado
Keyword(s):  
Real Time ◽  
Nitrogen Removal ◽  
Control Strategy ◽  
Real Time Control ◽  
Time Control

Municipal Wastewater Systems, Integrated Approach to Design, Monitoring and Control

1994 ◽  
Vol 29 (1-2) ◽  
pp. 419-426 ◽  
Author(s):  
P. Harremoës ◽  
T. Hvitved-Jacobsen ◽  
A. Lynggaard-Jensen ◽  
B. Nielsen
Keyword(s):  
Real Time ◽  
Large Scale ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Integrated Approach ◽  
Oxygen Depletion ◽  
Monitoring And Control ◽  
Real Time Control ◽  
Time Control ◽  
Wastewater Systems

A city and several companies joined in a large scale project with the aim to introduce real time control of the sewer system and the wastewater treatment plant. The basic goals were established from the receiving water studies, and essentially represent constraints on the total nutrient discharge causing eutrophication of a fjord and limits on oxygen depletion by combined sewer overflows in the small upstream rivers. The paper describes the basic principles and approaches for the real time control in urban wastewater systems.

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