scholarly journals Simulation and assessment of long-term stormwater basin performance under real-time control retrofits

2020 ◽  
Vol 17 (5) ◽  
pp. 467-480
Author(s):  
Zoë K. Schmitt ◽  
Clayton C. Hodges ◽  
Randel L. Dymond
Author(s):  
Aaron Akin ◽  
Jon Hathaway ◽  
Anahita Khojandi

Dry extended detention basins are static stormwater infrastructure, unable to adapt to shifts in water quality caused by urbanization in their source watersheds or long-term changes in rainfall patterns. As...


2013 ◽  
Vol 223 ◽  
pp. 467-478 ◽  
Author(s):  
Christian Antileo ◽  
Hardy Medina ◽  
Cristian Bornhardt ◽  
Carlos Muñoz ◽  
Francisco Jaramillo ◽  
...  

2009 ◽  
Vol 59 (4) ◽  
pp. 787-796 ◽  
Author(s):  
Tao Ma ◽  
Chaocheng Zhao ◽  
Yongzhen Peng ◽  
Xiuhong Liu ◽  
Li Zhou

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.


1995 ◽  
Vol 34 (05) ◽  
pp. 475-488
Author(s):  
B. Seroussi ◽  
J. F. Boisvieux ◽  
V. Morice

Abstract:The monitoring and treatment of patients in a care unit is a complex task in which even the most experienced clinicians can make errors. A hemato-oncology department in which patients undergo chemotherapy asked for a computerized system able to provide intelligent and continuous support in this task. One issue in building such a system is the definition of a control architecture able to manage, in real time, a treatment plan containing prescriptions and protocols in which temporal constraints are expressed in various ways, that is, which supervises the treatment, including controlling the timely execution of prescriptions and suggesting modifications to the plan according to the patient’s evolving condition. The system to solve these issues, called SEPIA, has to manage the dynamic, processes involved in patient care. Its role is to generate, in real time, commands for the patient’s care (execution of tests, administration of drugs) from a plan, and to monitor the patient’s state so that it may propose actions updating the plan. The necessity of an explicit time representation is shown. We propose using a linear time structure towards the past, with precise and absolute dates, open towards the future, and with imprecise and relative dates. Temporal relative scales are introduced to facilitate knowledge representation and access.


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