Application of pH, DO and OUR Control for Short-Cut Nitrification

2011 ◽  
Vol 347-353 ◽  
pp. 2112-2116
Author(s):  
Wen Bing Chen ◽  
Meng Tian ◽  
Ran Ran Wang ◽  
Feng Liu
Keyword(s):  
Shock Loading ◽  
Sequencing Batch Reactor ◽  
Consumption Rate ◽  
Accumulation Rate ◽  
Batch Reactor ◽  
Nitrite Accumulation ◽  
Real Time Control ◽  
Aeration Time ◽  
Time Control ◽  
Steady Stage

A sequencing batch reactor was employed to treat ammonia wastewater, the pH, DO and OUR were adopted to monitor the start of short-cut nitrification. The results showed that the start of short-cut nitrification was achieved in 31days, ammonia consumption rate was higher than 90% and nitrite accumulation rate was higher than 85%, when pH, DO and OUR were applied to monitor and determine the aeration time, under the condition of temperature was 30°C. With ammonia shock loading conditions, OUR curve couldn’t indicate the end of short-cut nitrification exactly. But real-time control using pH and DO could achieve a stable shortcut nitrification under steady stage and ammonia load shocking stage.

Biological nitrogen removal in SBR bypassing nitrate generation accomplished by chlorination and aeration time control

2004 ◽  
Vol 49 (5-6) ◽  
pp. 295-300 ◽  
Author(s):  
Y. Peng ◽  
X. Song ◽  
C. Peng ◽  
J. Li ◽  
Y. Chen
Keyword(s):  
Nitrogen Removal ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Biological Nitrogen Removal ◽  
Nitrite Accumulation ◽  
Removal Process ◽  
Aeration Time ◽  
Time Control ◽  
The Cost ◽  
Biological Nitrogen

A novel control strategy for biological nitrogen removal with high nitrite built-up through chlorine dosage was studied. In the biological nitrogen removal process operated in a bench-scale sequencing batch reactor, dose of chlorine of 0.2 mg/l in the form of sodium hypochlorite was applied after the COD was depleted. The aerobic phase switched to an anoxic phase shortly after the ammonium was completely biotically oxidized. Nitrite accumulation was stably achieved which was attributed to the chlorination and the lag-time of nitrification. With the time control, stable 100% conversion of nitrite could also be sustained even under the absence of chlorine for at least 20 days. The nitrite oxidizer should have been killed rather than been suppressed in this study. For engineering applications, the advantages of the nitrification/denitrification via nitrite can compensate the cost of chlorine dosage. Combined with the aeration time control, it is feasible to apply chlorination in a biological nitrogen removal process in SBRs.

Applying real-time control for realization and stabilization of shortcut nitrification-denitrification in domestic water treatment

2009 ◽  
Vol 59 (4) ◽  
pp. 787-796 ◽  
Author(s):  
Tao Ma ◽  
Chaocheng Zhao ◽  
Yongzhen Peng ◽  
Xiuhong Liu ◽  
Li Zhou
Keyword(s):  
Real Time ◽  
Accumulation Rate ◽  
Batch Reactor ◽  
Operation Mode ◽  
Domestic Wastewater ◽  
Nitrite Accumulation ◽  
Real Time Control ◽  
Domestic Water ◽  
Time Control

A sequencing batch reactor (SBR) was used to treat real domestic wastewater focusing on the achievement, maintenance and the feasibility of nitrite accumulation under real-time control. Keeping temperature, MLSS and dissolved oxygen (DO) in reactor at 28±1°C, 2,400 mg/L and higher than 2.0 mg/L respectively, shortcut nitrification-denitrification was successfully achieved after about two months. But the sudden raise of ammonia loading rate (ALR) caused deterioration of nitrite accumulation and occurrence of filamentous sludge bulking. These undesirable situations could be solved by pre-anaerobic operation mode. If applying long-term real-time control strategy to supervise the nitrification course, the sludge population optimization and high nitrite accumulation rate at different DO levels could be achieved. The strategy taking pH and aeration quantity as control parameters for nitrification in SBR was put forward under invariable DO conditions in this paper. By maintaining low DO level (below 1.0 mg/L), the shortcut nitrification-denitrification could be achieved in the same reactor with simultaneous nitrification and denitrification (SND), through which the removed nitrogen accounted for 49.12% to 66.81% of total nitrogen (TN) in influent at the end of shortcut nitrification.

Study on the Technology of Shortcut Nitrification-Denitrification Simultaneous Phosphorus Removal

2013 ◽  
Vol 864-867 ◽  
pp. 1503-1508 ◽  
Author(s):  
Ming Fen Niu ◽  
Hai Jiao Yu
Keyword(s):  
Phosphorus Removal ◽  
Sequencing Batch Reactor ◽  
Accumulation Rate ◽  
Removal Rate ◽  
Batch Reactor ◽  
Operating Conditions ◽  
Nitrite Accumulation

Shortcut Nitrification-Denitrification Simultaneous Phosphorus Removal applying in sequencing batch reactor were achieved successfully by Changing the run mode of SBR and controlling the operating conditions. When the MLSS:4700mg/L, PH:7.5~8.0 and DO:0.3~0.5mg/L(Aerobic phase), the removal rate of TP was more than 98%, the nitrite accumulation rate was more than 85%. After the reaction period of Shortcut Nitrification-Denitrification simultaneous Phosphorus Removal, the concentration of NH4+-N was below 50mg/L and the concentration of TP was less than 0.5mg/L.

Integrated real-time control for a sequencing batch reactor plant and a combined sewer system

2005 ◽  
Vol 52 (5) ◽  
pp. 179-186 ◽  
Author(s):  
J. Wiese ◽  
J. Simon ◽  
T.G. Schmitt
Keyword(s):  
Real Time ◽  
Sequencing Batch Reactor ◽  
Cost Benefit Analysis ◽  
Batch Reactor ◽  
Cost Benefit ◽  
Full Scale ◽  
Real Time Control ◽  
Time Control ◽  
First Results ◽  
Almost All

Integrated real-time control (RTC) concepts, which are trying to operate drainage systems and WWTPs depending on the current capacities of both systems, are becoming more and more important. While almost all publications in this field have been concentrating on continuous flow systems, this paper will present a project which has been initiated to realise an integrated RTC strategy for a Sequencing Batch Reactor (SBR) plant in simulation as well as in full-scale. The results of the simulation are that SBR plants can handle high hydraulic loads. The cost–benefit analysis shows that an integrated operation is reasonable concerning environmental and economic aspects. In order to verify the simulation results, full-scale operation has been started in January 2004. The first results seem to confirm the results of the simulation study.

A process-dependent real-time controller for sequencing batch reactor plants: results of full-scale operation

2006 ◽  
Vol 53 (4-5) ◽  
pp. 143-150 ◽  
Author(s):  
J. Wiese ◽  
J. Simon ◽  
H. Steinmetz
Keyword(s):  
Real Time ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Full Scale ◽  
Treatment Efficiency ◽  
Real Time Control ◽  
Reactor Plant ◽  
Research Project ◽  
Time Control ◽  
N Treatment

This paper presents results of a research project, in which a process-dependent real-time control (RTC) strategy for a sequencing batch reactor plant was realised in full-scale. The cycle controller is based on NH4 analysers, NO3 probes, TSS probes and sludge level probes. With this new RTC strategy it was possible to increase the treatment capacity by 50%. By implementation of the new controller the TN, TP and NH4-N treatment efficiency could be improved significantly, too. The treatment efficiency concerning COD is comparable.

Use pH and ORP as fuzzy control parameters of denitrification in SBR process

2002 ◽  
Vol 46 (4-5) ◽  
pp. 131-137 ◽  
Author(s):  
Y.Z. Peng ◽  
J.F. Gao ◽  
S.Y. Wang ◽  
M.H. Sui
Keyword(s):  
Fuzzy Control ◽  
Sequencing Batch Reactor ◽  
Fuzzy Controller ◽  
Batch Reactor ◽  
Limiting Factor ◽  
Control Parameters ◽  
Carbon Addition ◽  
Brewery Wastewater ◽  
Aeration Time ◽  
On Line

In order to achieve fuzzy control of denitrification in a Sequencing Batch Reactor (SBR) brewery wastewater was used as the substrate. The effects of brewery wastewater, sodium acetate, methanol and endogenous carbon source on the relationships between pH, ORP and denitrification were investigated. Also different quantities of brewery wastewater were examined. All the results indicated that the nitrate apex and nitrate knee occurred in the pH and ORP profiles at the end of denitrification. And when carbon was the limiting factor, through comparing the different increasing rate of pH whether the carbon was enough or not could be known, and when the carbon should be added again could be decided. On the basis of this, the fuzzy controller for denitrification in SBR was constructed, and the on-line fuzzy control experiments comparing three methods of carbon addition were carried out. The results showed that continuous carbon addition at a low rate might be the best method, it could not only give higher denitrification rate but also reduce the re-aeration time as much as possible. It appears promising to use pH and ORP as fuzzy control parameters to control the denitrification time and the addition of carbon.

Sign in / Sign up

Export Citation Format

Share Document