| Detection of gas pockets in pressurised wastewater mains using dynamic system response analysis. | |
| | |
MedLine Citation:
|
PMID: 17425069 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
In the Netherlands, wastewater is mostly collected in combined sewer system and transported to a WWTP through pressure mains. These pressure mains form an element of the system that did not receive much attention lately with respect to monitoring of performance and maintenance. For that reason, their state of functioning is often not known. Failure of operation is only noticed when during storm conditions the capacity of the system drops, resulting in undesirable discharge to the surface water. A recently made inventory showed that about half of the pressure mains show increased pressure loss for no obvious reason. Reduction of the systems nominal capacity can result from many causes, like increased wall roughness, scaling and the occurrence of free gas in the pipeline. The occurrence of gas-pockets may be caused by degassing of dissolved gas, but also by air entrapment at the pump inlet or at air valves. A research project is started that will be carried out from 2003 to 2005. This project focuses on three goals: the description of the gas-water transport phenomena in wastewater pressure mains, a method to detect and diagnose gas problems, and to overcome future problems by either applying remedial measures or by developing improved design methods for wastewater pressure systems. This paper describes the layout of the experimental set-up to detect and diagnose gas problems and the first results of the experiments are presented and discussed. The results are used to validate a model (Wanda) developed by Delft Hydraulics that describes the phenomena involved in surges in air/water transport. |
| | |
Authors:
|
C Lubbers; F Clemens |
Related Documents
:
|
18826929 - Compressibility of water in magma and the prediction of density crossovers in mantle di... 16907199 - Self-focusing arrest of femtosecond laser pulses in air at different pressures. 19746779 - Sensitivity of fluorophore-quencher labeled microbubbles to externally applied static p... 17122849 - Dynamics of seismogenic volcanic extrusion at mount st helens in 2004-05. 18849159 - Tonometric biosensor with a differential pressure sensor for chemo-mechanical measureme... 18052489 - Method for rapid determination of ion gauge sensitivity factors. 20733959 - Accuracy of methods for urinary detection in women with stress urinary incontinence. 20359919 - Ceramic cells for high pressure nmr spectroscopy of proteins. 3196599 - Comparative in vitro evaluations of vascular graft compliance during dynamic loading. |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
|
Title: Water science and technology : a journal of the International Association on Water Pollution Research Volume: 55 ISSN: 0273-1223 ISO Abbreviation: Water Sci. Technol. Publication Date: 2007 |
Date Detail:
|
Created Date: 2007-04-11 Completed Date: 2007-06-11 Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 9879497 Medline TA: Water Sci Technol Country: England |
Other Details:
|
Languages: eng Pagination: 31-8 Citation Subset: IM |
Affiliation:
|
WL / Delft Hydraulics, P.O. Box 177, 2600 MH Delft, the Netherlands. Christof.Lubbers@WLDelft.nl |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Environmental Monitoring
/
methods Gases / analysis* Models, Theoretical Netherlands Pressure Sewage / analysis* Waste Disposal, Fluid / methods* |
| Chemical | |
Reg. No./Substance:
|
0/Gases; 0/Sewage |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: An integrated modeling approach to predict flooding on urban basin.
Next Document: Implementing a space-time rainfall model for the Sydney region.