Modeling of nitrogen removal and control strategy in continuous-flow-intermittent-aeration process

2012 ◽  
Vol 4 (47) ◽  
Author(s):  
Tian-yin HUANG
Keyword(s):  
Nitrogen Removal ◽  
Control Strategy ◽  
Continuous Flow ◽  
Intermittent Aeration ◽  
Aeration Process ◽  
And Control

Effect of dissolved oxygen conditions on nitrogen removal in continuously fed intermittent-aeration process with two tanks

2002 ◽  
Vol 45 (12) ◽  
pp. 181-188 ◽  
Author(s):  
T. Hidaka ◽  
H. Yamada ◽  
M. Kawamura ◽  
H. Tsuno
Keyword(s):  
Nitrogen Removal ◽  
Rural Areas ◽  
Aerobic Condition ◽  
Small Scale ◽  
Intermittent Aeration ◽  
Solids Retention ◽  
Oxygen Conditions ◽  
Control Set ◽  
Aeration Process ◽  
Biological Nitrogen

In this study, an intermittent aeration type activated sludge process that is fed continuously is evaluated for nitrogen and organic carbon for facilities in rural areas, which are characterized by small scale, low loading rate and automatic operation. Anoxic and aerobic conditions can be regulated alternatively by intermittent aeration for biological nitrogen removal. It is proved that an intermittent aeration cycle of 90 min, with aeration/anoxic mixing periods of 25~30 min/65~60 min in Tank 1, and 30~45 min/60~45 min in Tank 2, and a DO control set at 0.6~1 mg/L during the aeration period are required for satisfactory treatment performance. Under these conditions, a stable effluent water quality with BOD ≤ 5 mg/L, CODMn ≤ 8 mg/L, Nitrogen ≤ 3 mgN/L, SS ≤ 5 mg/L and transparency ≥ 80 cm can be achieved. The solids retention time in aerobic condition was 10~25 d, which is sufficient for nitrification.

Dynamical Modeling and Intelligent Control of Aeration Process for Pollutants Degradation in Technics of SBR

2016 ◽  
Vol 859 ◽  
pp. 127-133
Author(s):  
Hong Jian Tao ◽  
Hu Xu
Keyword(s):  
Control Strategy ◽  
Sewage Treatment ◽  
Control Process ◽  
Degradation Process ◽  
Pollutant Degradation ◽  
Modeling And Control ◽  
Precise Control ◽  
Aeration Process ◽  
And Control ◽  
The Mathematical Model

Aimed at the puzzle of the pollutant degradation of sewage treatment in technics of SBR being difficult to implement the mathematical modeling and precise control, the paper researched on the modeling and control of the aeration process in sewage treatment. In the paper, it pointed out the technical difficulties existed in pollutant degradation control, analyzed the cybernetics characteristic in pollutant degradation process, built the mathematical model of control process based on the mechanism of biochemical reaction, proposed the control strategy matched with the cybernetics characteristic of aeration process, constructed the control algorithm based on human simulate intelligence. Taken the built process control model as an example, the simulation experiments demonstrated the feasibility and effectiveness of proposed control strategy. The research results show that the built model and proposed control strategy are feasible and applicable.

Nitrogen Removal from Sewage by Continuous Flow SBR System with Intermittent Aeration

2001 ◽  
Vol 22 (5) ◽  
pp. 553-559 ◽  
Author(s):  
A.-C. Chen ◽  
J.-S. Chang ◽  
L. Yang ◽  
Y.-H. Yang
Keyword(s):  
Nitrogen Removal ◽  
Continuous Flow ◽  
Intermittent Aeration

Nitrogen Removal from Anaerobically Pretreated Swine Wastewater in an Intermittent Aeration Process

2005 ◽  
Author(s):  
Melanie A. Head ◽  
Cesar R. Mota ◽  
Jennifer A. Ridenoure ◽  
Francis L. de los Reyes III ◽  
and Jay J. Cheng
Keyword(s):  
Nitrogen Removal ◽  
Swine Wastewater ◽  
Intermittent Aeration ◽  
Aeration Process

Dry chip feedrate control using online chip moisture

TAPPI Journal ◽  
2018 ◽  
Vol 17 (05) ◽  
pp. 295-305
Author(s):  
Wesley Gilbert ◽  
Ivan Trush ◽  
Bruce Allison ◽  
Randy Reimer ◽  
Howard Mason
Keyword(s):  
Production Rate ◽  
Control Strategy ◽  
Rate Control ◽  
Near Infrared ◽  
Dry Mass ◽  
The Other ◽  
Process Variability ◽  
Moisture Sensor ◽  
Feedback Control Strategy ◽  
And Control

Normal practice in continuous digester operation is to set the production rate through the chip meter speed. This speed is seldom, if ever, adjusted except to change production, and most of the other digester inputs are ratioed to it. The inherent assumption is that constant chip meter speed equates to constant dry mass flow of chips. This is seldom, if ever, true. As a result, the actual production rate, effective alkali (EA)-to-wood and liquor-to-wood ratios may vary substantially from assumed values. This increases process variability and decreases profits. In this report, a new continuous digester production rate control strategy is developed that addresses this shortcoming. A new noncontacting near infrared–based chip moisture sensor is combined with the existing weightometer signal to estimate the actual dry chip mass feedrate entering the digester. The estimated feedrate is then used to implement a novel feedback control strategy that adjusts the chip meter speed to maintain the dry chip feedrate at the target value. The report details the results of applying the new measurements and control strategy to a dual vessel continuous digester.

A power management and control strategy with grid-ancillary services for a microgrid based on DC Bus

2014 ◽  
Vol 9 (4) ◽  
pp. 792 ◽  
Author(s):  
Anna Pinnarelli ◽  
Giuseppe Barone ◽  
Giovanni Brusco ◽  
Alessandro Burgio ◽  
Daniele Menniti ◽  
...  
Keyword(s):  
Power Management ◽  
Control Strategy ◽  
Ancillary Services ◽  
Dc Bus ◽  
And Control
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