Utility quick test for analyzing materials for drinking water distribution systems for effect on taste-and-odor

2004 ◽  
Vol 49 (9) ◽  
pp. 75-80 ◽  
Author(s):  
L. Schweitzer ◽  
P. Tomboulian ◽  
K. Atasi ◽  
T. Chen ◽  
D. Khiari
Keyword(s):  
Drinking Water ◽  
Distribution Systems ◽  
Water Distribution ◽  
Profile Analysis ◽  
Water System ◽  
Drinking Water Distribution Systems ◽  
Taste And Odor ◽  
Drinking Water Distribution ◽  
Sensory Analyses ◽  
European Standards

A workshop of international drinking water experts was convened in Sedona, Arizona, March 26-27, 2001 for the purpose of developing a method for testing drinking water system components for their potential to contribute to taste-and-odor problems in drinking water. The workshop participants derived a method using provisions from European Standards as well as newly developed approaches. It is intended that this method can serve as a temporary procedure for water utilities, as well as a recommended template to derive an official standard. Materials to be tested may include pipes, fittings, ancillaries, joints, lubricants, tanks, and reservoirs. The recommended method includes a migration (leaching) test with chlorinated water, followed by sensory analysis of the samples from the migration test after dechlorination. Sensory analyses use both statistical (e.g., triangle test) and descriptive (e.g. Flavor Profile Analysis) techniques. A decision tree for the results is provided.

Materials used in drinking water distribution systems: contribution to taste-and-odor

2004 ◽  
Vol 49 (9) ◽  
pp. 219-226 ◽  
Author(s):  
P. Tomboulian ◽  
L. Schweitzer ◽  
K. Mullin ◽  
J. Wilson ◽  
D. Khiari
Keyword(s):  
Drinking Water ◽  
Distribution Systems ◽  
Water Distribution ◽  
Water System ◽  
Water Utilities ◽  
Drinking Water Distribution Systems ◽  
Taste And Odor ◽  
Drinking Water Distribution ◽  
Materials Used ◽  
Water Taste

In order to assist drinking water utilities with identifying the possible sources and causes of taste-and-odor conditions associated with materials used in distribution systems, we evaluated information from case studies and a database from the National Sanitation Foundation (NSF), International. This database identified chemicals that had leached from drinking water system components during testing of materials under ANSI/NSF Standard 61, which provides information to water utilities on potential taste-and-odor and health concerns from the use of new materials. The data were arranged to provide a process for locating the potential source of a taste-and-odor event. After a sensory analysis is conducted on the drinking water samples, the descriptor can be matched with categories on the "Drinking Water Taste and Odor Wheel 2000" in order to suggest the candidate material.

Tastes and Odors in Drinking Water Distribution Systems Related to the Use of Synthetic Materials

1999 ◽  
Vol 40 (6) ◽  
pp. 203-208 ◽  
Author(s):  
S. Rigal ◽  
J. Danjou
Keyword(s):  
Drinking Water ◽  
Distribution Systems ◽  
Water Distribution ◽  
Cementitious Materials ◽  
Drinking Water Distribution Systems ◽  
Synthetic Materials ◽  
Taste And Odor ◽  
Drinking Water Distribution ◽  
By Products

Plastic pipes, organic coatings and membranes, and epoxy relining products are progressively replacing existing traditional metallic or cementitious materials. Despite existing controls, and for different reasons, additives, solvents, or monomers can be leached into the drinking water. Until ten years ago, such problems frequently occurred. French regulations now oblige the manufacturers to obtain approvals for their products for contact with drinking water, and such problems now occur less and less. The objectives of this research were to investigate the causes of odor and flavor problems generated in distribution systems, water towers, and lined systems. Four case studies and an experimental study of taste and odor deterioration of water quality are presented to identify the responsible substances related to materials. In each case study, organic components which characterized the cause of the problems were measured experimentally. Components (e.g., styrene and chlorinated by-products) resulting in a high TON/TFN were identified as the chemicals responsible for the cause of odor and flavor problems.

The effect of applying a pipe-joint lubricant to connect ductile iron pipe on off-flavors in drinking water distribution systems

2004 ◽  
Vol 49 (9) ◽  
pp. 233-240 ◽  
Author(s):  
K.E. Wiesenthal ◽  
G. Amah ◽  
T. Lam ◽  
I.H. Suffet
Keyword(s):  
Drinking Water ◽  
Ductile Iron ◽  
Distribution Systems ◽  
Water Distribution ◽  
Profile Analysis ◽  
Water Distribution Systems ◽  
Drinking Water Distribution Systems ◽  
Drinking Water Distribution ◽  
Rancid Oil ◽  
Pipe Joint

This study was used to help define the contribution to taste and odor problems caused by the application of a pipe-joint lubricant to connect ductile iron pipe in drinking water distribution systems. Tyton Joint Lubricant (TJL) was studied. The lubricant produced odors that are continually oxidized by chlorine or oxygen. The mechanism of oxidative rancidity, one of the major causes of food spoilage is the apparent mechanism of oxidation. The odors produced by the lubricant were characterized by a Flavor Profile Analysis (FPA) panel as well as GC/MS and Sensory GC analysis. The most common odors perceived in the TJL water samples for the first six days were waxy/oily and soapy odors with a rancid oil, odor note. The waxy/oily and soapy odors decreased with time in the chlorine medium as the rancid oily odor note increased. Numerous aldehydes, ketones, alcohols and borneol compounds, produced from the lubricants, were tentatively identified and linked to the odors perceived by the FPA panel.

scholarly journals Identification of Aminoglycoside Resistance Genes From Bacteria Isolated From Selected Municipal Drinking Water Distribution Systems in Southwestern Nigeria

2020 ◽  
Vol 41 (S1) ◽  
pp. s255-s255
Author(s):  
Ayodele T. Adesoji ◽  
Adeniyi A. Ogunjobi
Keyword(s):  
Drinking Water ◽  
Distribution Systems ◽  
Water Distribution ◽  
Water Distribution Systems ◽  
Multidrug Resistant ◽  
Resistant Bacteria ◽  
Multidrug Resistant Bacteria ◽  
Southwestern Nigeria ◽  
Drinking Water Distribution Systems ◽  
Drinking Water Distribution

Background: Multidrug-resistant bacteria can lead to treatment failure, resulting in infectious diseases being transferred through nonpotable water. Aminoglycosides are an important class of antibiotics that are abused in Nigeria. Few studies have investigated aminoglycoside-modifying genes (AMGs) that are likely responsible for resistance in Nigeria bacteria isolates. Therefore, we aimed to characterize AMGs from isolates in drinking water distribution systems (DWDS) in southwestern Nigeria. Methods: Multidrug-resistant bacteria (n = 181) that had been previously characterized by 16S rDNA sequencing and that were positive for resistance to at least 1 aminoglycoside antibiotic were selected from 6 treated and untreated water distribution systems. Strains were PCR genotyped for 3 AMGs: aph(3)c, ant(3)b and aph(6)-1dd. Results: Of 181 MDR bacteria tested, 69 (38.12%) were positive for at least 1 of the AMGs. The most common was ant(3)c (27.6%), followed by aph(3")c (18.23%). Both aph(3)c and ant(3")b were found in 7.73% of tested isolates, ant(3)b was most commonly found in Alcaligenes spp (50%). Furthermore, aph(3")c was most commonly detected in Proteus spp (50%). Other genera positive for AMGs included Acinetobacter, Aeromonas, Bordetella, Brevundimonas, Chromobacterium, Klebsiella, Leucobacter, Morganella, Pantoae, Proteus, Providencia, Psychrobacter, and Serratia. Conclusions: High occurrence of ant(3)c and aph(3)c among these bacteria call for urgent attention among public health workers because these genes can be easily disseminated to consumers if present on mobile genetic elements like plasmids, integrons, and transposons.Funding: NoneDisclosures: None

Characterization of chemical composition and bacterial community of corrosion scales in different drinking water distribution systems

2017 ◽  
Vol 3 (1) ◽  
pp. 147-155 ◽  
Author(s):  
Haibo Wang ◽  
Chun Hu ◽  
Lang Yin ◽  
Sujia Zhang ◽  
Lizhong Liu
Keyword(s):  
Drinking Water ◽  
Chemical Composition ◽  
Distribution Systems ◽  
Water Distribution ◽  
Iron Release ◽  
Drinking Water Distribution Systems ◽  
Biochemical Function ◽  
Drinking Water Distribution ◽  
Corrosion Scales

There is a relationship between biochemical function and chemical composition of corrosion scales, and Fe3O4formation reduced iron release.

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