A comparative analysis of methods to represent uncertainty in estimating the cost of constructing wastewater treatment plants

2002 ◽  
Vol 65 (4) ◽  
pp. 383-409 ◽  
Author(s):  
Ho-Wen Chen ◽  
Ni-Bin Chang
Keyword(s):  
Wastewater Treatment ◽  
Comparative Analysis ◽  
Wastewater Treatment Plants ◽  
The Cost

scholarly journals ENERGY RECOVERY FROM ACTIVE SLUDGE OF WASTEWATER TREATMENT PLANTS

2018 ◽  
Vol 54 (2A) ◽  
pp. 49
Author(s):  
Nguyen Vo Chau Ngan
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Anaerobic Fermentation ◽  
Industrial Sector ◽  
Fish Processing ◽  
Active Sludge ◽  
Anaerobic Digesters ◽  
Biogas Yield ◽  
Input Material ◽  
The Cost

Due to fast growth of industrial sector, the volume of sludge from wastewater treatment systems increases, and this becomes a big problem to the environment. The cost for treatment of sludge is high and requires typical landfill for disposal. This study suggested recovering energy from the sludge of wastewater treatment plants through an anaerobic fermentation process. Sludge from wastewater treatment plants of fish processing factory (C) and shrimp processing factory (T) were collected for the testing of this study. The 20 L lab-scale batch anaerobic digesters were used to ferment sludge which has different humidity of 85 - 90 % and of 95 - 98 %. The biogas yield of the treatment C 85-90 is 305.3, C 95-98 is 444.2, T 85-90 is 144.4, and T 95 - 98 is 171.1 L/kg ODMfermented. After 10 operation days, the percentage of CH4 in the produced biogas was around 50 % which is high enough for energy purposes. The result clearly confirms that sludge from wastewater treatment plants not only is possible treated in anaerobic digesters but also is able to be applied as input material to produce biogas for energy consumption.

Impact of Regulatory Delays on the Cost of Wastewater Treatment Plants

1983 ◽  
Vol 59 (1) ◽  
pp. 35 ◽  
Author(s):  
Krista S. Reed ◽  
C. Edwin Young
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
The Cost

The use of computational fluid dynamics (CFD). Technique for evaluating the efficiency of an activated sludge reactor

1999 ◽  
Vol 39 (10-11) ◽  
pp. 329-332 ◽  
Author(s):  
A. B. Karama ◽  
O. O. Onyejekwe ◽  
C. J. Brouckaert ◽  
C. A. Buckley
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plants ◽  
Computational Techniques ◽  
Activated Sludge Reactor ◽  
Computational Fluid Dynamics Cfd ◽  
The Cost ◽  
New Generation

Adequate models for wastewater treatment are limited by the cost of constructing them. Many a time, studies carried out on wastewater treatment plants have not been very useful in enhancing their performance. As a result, numerous mathematical models presented by different researchers on sedimentation tanks and clarifiers have not been getting much attention. Recently, improvement in computers and computational techniques have led to the development of a new generation of highly efficient programs for simulating real fluid flow within any type of geometry including clarifiers and activated sludge reactors. Herein, a computational fluid dynamics code, PHOENICS, is used to determine the performance of an anaerobic zone in an activated sludge reactor. Plausible results were achieved when experimental data were compared with numerical results.

Privatization of Wastewater Treatment Plants: Lessons from Changing Corporate Strategies

1997 ◽  
Vol 2 (2) ◽  
pp. 140-147
Author(s):  
Cal Clark ◽  
John G. Heilman ◽  
Gerald W. Johnson
Keyword(s):  
Wastewater Treatment ◽  
Cost Effectiveness ◽  
Private Sector ◽  
Wastewater Treatment Plants ◽  
Cost Minimization ◽  
Corporate Strategies ◽  
Corporate World ◽  
Laissez Faire ◽  
The Cost

Burgeoning budgetary pressures have created considerable interest for the privatization of public services. Privatization is usually justified in terms of the cost effectiveness that laissez-faire economics impose on the private sector. Yet, this model has come under challenge in the corporate world because businesses often must pursue other goals than just cost minimization, such as product quality, flexibility of production, and long-term alliances with other corporations, including ostensible competitors. A similar situation exists concerning the privatization of wastewater treatment plants (WWTPs) during the 1980s. Rather than adhering to the laissez-faire model, WWTP privatization was much more concerned with quality, flexibility, and “public-private partnerships,” suggesting that a broader and more sophisticated view of privatization is needed.

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