Wastewater Treatment Plants under Transient Loading – Performance, Modelling and Control

1993 ◽  
Vol 27 (12) ◽  
pp. 71-115 ◽  
Author(s):  
P. Harremoës ◽  
A. G. Capodaglio ◽  
B. G. Hellström ◽  
M. Henze ◽  
K. N. Jensen ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Performance Modelling ◽  
Transient Loading ◽  
And Control

scholarly journals Energetic flexibility on wastewater treatment plants

2017 ◽  
Vol 76 (5) ◽  
pp. 1225-1233 ◽  
Author(s):  
M. Schäfer ◽  
I. Hobus ◽  
T. G. Schmitt
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Energy Systems ◽  
Energy Market ◽  
Control Parameters ◽  
Effluent Quality ◽  
The Future ◽  
Energy Consuming ◽  
Characteristic Values ◽  
And Control

In the future, an additional potential of control reserve as well as storage capacities will be required to compensate fluctuating renewable energy availability. The operation of energy systems will change and flexibility in energy generation and consumption will rise to a valuable asset. Wastewater treatment plants (WWTPs) are capable of providing the flexibility needed, not only with their energy generators but also in terms of their energy consuming aggregates on the plant. To meet challenges of the future in regard to energy purchase and to participate in and contribute to such a volatile energy market, WWTPs have to reveal their energetic potential as a flexible service provider. Based on the evaluated literature and a detailed analysis of aggregates on a pilot WWTP an aggregate management has been developed to shift loads and provide a procedure to identify usable aggregates, characteristic values and control parameters to ensure effluent quality. The results show that WWTPs have a significant potential to provide energetic flexibility. Even for vulnerable components such as aeration systems, load-shifting is possible with appropriate control parameters and reasonable time slots without endangering system functionality.

MEASUREMENTS, DATA ANALYSIS AND CONTROL METHODS IN WASTEWATER TREATMENT PLANTS—STATE OF THE ART AND FUTURE TRENDS

1988 ◽  
pp. 1333-1345
Author(s):  
Gustaf Olsson ◽  
Bengt Andersson ◽  
Bengt Göran Hellström ◽  
Hans Holmström ◽  
Lars Gunnar Reinius ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Data Analysis ◽  
Wastewater Treatment Plants ◽  
State Of The Art ◽  
Control Methods ◽  
Future Trends ◽  
And Control

Increased performance of secondary clarifiers using dynamic distribution of minimum return sludge rates

2009 ◽  
Vol 60 (9) ◽  
pp. 2439-2445 ◽  
Author(s):  
A. Lynggaard-Jensen ◽  
P. Andreasen ◽  
F. Husum ◽  
M. Nygaard ◽  
J. Kaltoft ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Suspended Solids ◽  
Considerable Increase ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Total Flow ◽  
Equal Distribution ◽  
Solids Concentration ◽  
Hydraulic Load ◽  
And Control

Most wastewater treatment plants have several secondary clarifiers or even more sets of clarifiers including several secondary clarifiers, and in practice it is a well known problem that equal distribution of the load to the single clarifier (or set of clarifiers) is very difficult—not to say impossible—to obtain. If the problem is neglected, quite a big percentage of the total clarifier capacity—measured as the max. allowed hydraulic load—can be lost. Further, return sludge rates are seldom controlled by any other means than as a (typically too high) percentage of the inlet to the wastewater treatment plant—giving a varying and too low suspended solids concentration in the return sludge, which again can lead to an unnecessary use of polymer in the pre-dewatering of the surplus sludge taken from the return sludge. A control of the return sludge rate divided into two parts - control of the total return sludge flow and control of how the total flow shall be distributed between the secondary clarifiers - is able to solve the mentioned problems. Finally, as shall be demonstrated on full scale wastewater treatment plants, a considerable increase of the hydraulic capacity of the treatment plants can be obtained.

FOAMING CAUSES AND CONTROL IN ACTIVATED SLUDGE WASTEWATER TREATMENT PLANTS

2006 ◽  
Vol 5 (6) ◽  
pp. 1407-1413
Author(s):  
Ileana Ghita ◽  
Elisabeta Pena-Leonte ◽  
Aurelia Ballo ◽  
Cristiana Cosma ◽  
Ciprian Dumitrescu ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plants ◽  
And Control

Causes and control practices of filamentous foaming in wastewater treatment plants

2012 ◽  
Vol 7 (3) ◽  
Author(s):  
D. Mamais ◽  
M. Marneri ◽  
C. Noutsopoulos
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Sewage Treatment ◽  
Economic Feasibility ◽  
Control Methods ◽  
Filamentous Bacteria ◽  
Foam Control ◽  
Filamentous Foaming ◽  
And Control ◽  
Athens Area

Three large Wastewater Treatment Plants (WWTP) in Greece with occasional severe foaming were selected in order to evaluate the influence of the recycle of foaming filamentous bacteria from the solids handling processes to their foaming problems. According to the results, a range of 3–39% of the total quantity of viable foaming filamentous bacteria present in biological wastewater treatment stage of the WWTPs was found to be recycled through the underflows of thickening and dewatering processes. In parallel, the feasibility of alternative nonspecific foam control methods was assessed. Within the context of this study two foam control practices were evaluated: (a) the addition of polyaluminium chloride (PAX) to the mixed liquor and (b) the selective wasting of foam from the activated sludge system followed by dewatering. The economic feasibility of each method was assessed by evaluating and comparing the total cost (capital cost and operation and maintenance costs) of each alternative for Psyttalia Sewage Treatment Works, which is the largest WWTP in Greece serving the Greater Athens Area with a treatment capacity of approximately 3.5 million people. The estimated total costs of the two foam control methods were 0.009 and 0.002 €/m3 of wastewater for PAX addition and selective wasting of foam, respectively.

An integrated system to remote monitor and control anaerobic wastewater treatment plants through the internet

2005 ◽  
Vol 52 (1-2) ◽  
pp. 457-464 ◽  
Author(s):  
O. Bernard ◽  
B. Chachuat ◽  
A. Hélias ◽  
B. Le Dantec ◽  
B. Sialve ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Integrated System ◽  
The Internet ◽  
Anaerobic Wastewater Treatment ◽  
Control Centre ◽  
Automatic Controllers ◽  
New Sensors ◽  
And Control

The TELEMAC project brings new methodologies from the Information and Science Technologies field to the world of water treatment. TELEMAC offers an advanced remote management system which adapts to most of the anaerobic wastewater treatment plants that do not benefit from a local expert in wastewater treatment. The TELEMAC system takes advantage of new sensors to better monitor the process dynamics and to run automatic controllers that stabilise the treatment plant, meet the depollution requirements and provide a biogas quality suitable for cogeneration. If the automatic system detects a failure which cannot be solved automatically or locally by a technician, then an expert from the TELEMAC Control Centre is contacted via the internet and manages the problem.

Operations and Control in Wastewater Treatment - Some Swedish Experiences

1991 ◽  
Vol 24 (6) ◽  
pp. 193-200 ◽  
Author(s):  
Gustaf Olsson
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Working Environment ◽  
Process Technology ◽  
Control Engineering ◽  
Research Activities ◽  
Applied Microbiology ◽  
New Research ◽  
Technology Control ◽  
And Control

New demands on nutrient removal in Swedish wastewater treatment plants have motivated new research and development activities. In this paper some ideas behind a new Swedish government research program are described, and an outline of current research activities and programs is made. Operational problems are emphasized, and their interdisciplinary character is recognized. Consequently a research team has been formed in Lund with active participation from applied microbiology, process technology, control engineering and working environment technology, in cooperation with the sewage works in Malmö

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