Biological nitrogen removal with a real-time control strategy using moving slope changes of pH(mV)- and ORP-time profiles

To establish an automatic control system of external carbon addition in biological nitrogen removal, a bench-scale sequencing batch reactor with real-time control strategy was designed in this study. An oxidation-reduction potential (ORP) profile was used for automatic control of external carbon addition. The mean removal efficiency of total organic carbon was over 98%. Complete denitrification in an anoxic phase and complete denitrification and nitrification in anoxic and oxic phases were accomplished, respectively, because the oxic and anoxic periods were also appropriately controlled with ORP and pH profiles, respectively. Mean removal efficiency of total nitrogen was over 95%. When concentration of influent wastewater was changed, volume of additional carbon was automatically changed with the influent fluctuation, and flexible hydraulic retention time was achieved in this system.

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Integrated real-time control strategy for nitrogen removal in swine wastewater treatment using sequencing batch reactors

Water Research ◽

10.1016/j.watres.2004.05.006 ◽

2004 ◽

Vol 38 (14-15) ◽

pp. 3340-3348 ◽

Cited By ~ 84

Author(s):

Ju-Hyun Kim ◽

Meixue Chen ◽

Naohiro Kishida ◽

Ryuichi Sudo

Keyword(s):

Wastewater Treatment ◽

Real Time ◽

Nitrogen Removal ◽

Control Strategy ◽

Swine Wastewater ◽

Batch Reactors ◽

Sequencing Batch Reactors ◽

Real Time Control ◽

Time Control

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Review for "A real time control strategy for improvement of autonomous operation in AC / DC micro grids using electric springs"

10.1002/2050-7038.12626/v2/review1 ◽

2020 ◽

Keyword(s):

Real Time ◽

Control Strategy ◽

Real Time Control ◽

Time Control ◽

Autonomous Operation ◽

Micro Grids

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

Water Practice & Technology ◽

10.2166/wpt.2010.065 ◽

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.

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