Field Testing And Performance Evaluation Of River Water Treatment Plants

2018 ◽  
Author(s):  
HA Mohiyaden
Keyword(s):  
Performance Evaluation ◽  
Water Treatment ◽  
River Water ◽  
Field Testing ◽  
Water Treatment Plants ◽  
And Performance

Analysis of Performance Evaluation Index for bridge group networking monitoring and collaborative supervision

2021 ◽  
Author(s):  
Liye Zhang ◽  
Yong He ◽  
Shoushan Cheng ◽  
Guoliang Wang ◽  
Hongwei Ren ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Evaluation Method ◽  
Field Testing ◽  
Technical Condition ◽  
Evaluation Index ◽  
Technical Problems ◽  
Condition Evaluation ◽  
Bridge Group ◽  
Performance Evaluation Index ◽  
And Performance

<p>With the number of bridges increases, the bridge health monitoring (BHM) technique is developing from single bridge monitoring to collaborative supervision of bridge group. Therefore, there are many technical problems need to be solved especially the performance evaluation index for bridge group network. This paper analyses the performance evaluation index of the bridges and bridge group network, establishes the performance evaluation index for bridge group based on rating factor (RF) and technical condition evaluation index. Based on bridge field testing and monitoring data, bridge technical condition evaluation index and performance evaluation method for bridge group are proposed. A case study demonstrates that the research results provide support for bridge group networking monitoring and collaborative supervision.</p>

Coliphages and enteric viruses in the particulate phase of river water

1988 ◽  
Vol 34 (7) ◽  
pp. 907-910 ◽  
Author(s):  
Pierre Payment ◽  
Eric Morin ◽  
Michel Trudel
Keyword(s):  
Particulate Matter ◽  
Water Treatment ◽  
River Water ◽  
Suspended Particulate Matter ◽  
Natural Waters ◽  
Enteric Viruses ◽  
Particulate Phase ◽  
Water Treatment Plants ◽  
Suspended Particulate ◽  
Viral Adsorption

The present study was undertaken to determine if indigenous enteric viruses and coliphages are free or associated with suspended particulate matter in natural waters. River water was filtered on filters of decreasing porosities (100–0.25 μm) that were pretreated with detergent to eliminate viral adsorption while retaining particulates. This filtered water was refiltered in virus-adsorbing conditions to retain free viruses. The virus-adsorbing filter retained most of the enteric viruses (77.4%) and coliphages (65.8%), which indicated that these viruses were probably free or associated with particles with a diameter of less than 0.25 μm. These observations are important because in water treatment plants small particulates are often the most difficult to eliminate.

scholarly journals Lessons Learned on the Application of Vibration Absorbers for Enhanced Cannon Stabilization

2001 ◽  
Vol 8 (3-4) ◽  
pp. 131-139 ◽  
Author(s):  
Eric Kathe
Keyword(s):  
Performance Evaluation ◽  
Structural Modification ◽  
Digital Signal ◽  
Field Testing ◽  
Lessons Learned ◽  
External Control ◽  
Control Law ◽  
Vibration Absorbers ◽  
Ideal Behavior ◽  
And Performance

This paper will summarize the successful application of muzzle-end vibration absorbers to reduce cannon vibration. This technology constitutes a weapons stabilization approach that focuses on passive mechanical structural modification of the cannon, rather than relying upon an external control law to actively cancel vibrations. Challenges encountered during field testing, non-ideal behavior, and performance evaluation using digital signal processing will be highlighted.

Two Year Survey of Indicator Bacteria and Enteroviruses during the Preparation of Drinking Water from Three Water Treatment Plants in Paris Suburbs

1986 ◽  
Vol 18 (10) ◽  
pp. 107-107 ◽  
Author(s):  
J. C. Joret ◽  
T. Dupin ◽  
A. Hassen ◽  
F. Agbalika ◽  
P. Hartemann
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
River Water ◽  
Treatment Plant ◽  
Drinking Water Treatment ◽  
Indicator Bacteria ◽  
Fecal Coliforms ◽  
Virus Removal ◽  
Coxsackievirus B4 ◽  
Water Treatment Plants

Three conventional drinking water treatment plants were sampled monthly during a two year period for the removal of indicator bacteria and enteroviruses. Most 20 ℓ samples of raw river water were positive for viruses (principally Coxsackievirus B4 and B6, and echoviruses) with average virus concentrations varying from 0-3.5 PFU/ℓ for the less polluted river water (103-104 fecal coliforms/100 mℓ) to 0.1-20 PFU/ℓ for the highly polluted source (104-105 fecal coliforms/100 mℓ). In spite of these high levels of bacterial contamination, no viruses were detected from the 72 samples of 1 000 ℓ finished water. These results are discussed in regard to the virus removal efficiency of each treatment step previously evaluated by both pilot plant and full-scale water treatment plant studies. The mean virus removal was found to be 0-85% for storage (3 day period) of river water, 64-98% for preozonation (0.8 mg/ℓ/2-3 minutes), 31-90% for clarification by coagulation, flocculation and decantation, and 77-99% for sand filtration (5m/h). Total coliform counts were found to be good indicators of treatment for the presence of viruses in postozonated (1.5 mg/ℓ/10 min) water.

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