Reducing production of taste and odor by deep-living cyanobacteria in drinking water reservoirs by regulation of water level

The hydrological regime of water reservoirs in different years has a decisive impact on the abundance of commercial fish stocks and the quality of ichthyocenoses. In this connection in 2015-2016 there was conducted a retrospective analysis and ranking of hydrological regime impact on these factors. The paper gives evaluation of catches and fish stocks under different scenarios of water availability in the main fishing ponds of the Republic of Kazakhstan that give about 80% of the annual fish catch of the country (except the Caspian Sea). There were analyzed 2000 factors of hydrological regime (water level, annual discharge) and 1845 factors of fishing stocks (catches, abundance, fish biomass). The paper determines the critical characteristics of water availability for fish stocks. There have been proposed a number of administrative decisions and actions in case if water content would approach to the critical level. Among them: limitation of fish catches in the following year; widening zones restricted for fishing; intensification of safety measures of the fish young in residual ponds during arid periods; introduction of catch standards for a unit of fishing effort in low-water years, high-water years and years with normal water level in rivers.

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Lead removal from drinking water - development and validation of point-of-use treatment devices

Water Science & Technology Water Supply ◽

10.2166/ws.2002.0171 ◽

2002 ◽

Vol 2 (5-6) ◽

pp. 209-216

Author(s):

R. Sublet ◽

A. Boireau ◽

V.X. Yang ◽

M.-O. Simonnot ◽

C. Autugelle

Keyword(s):

Drinking Water ◽

Fixed Bed ◽

Field Testing ◽

Lead Removal ◽

Ministry Of Health ◽

Point Of Use ◽

Taste And Odor ◽

Wide Range ◽

Lead Levels ◽

Safety Considerations

Two lead removal water filters were developed to lower lead levels in drinking water below 10 μg.L-1 in order to meet the new regulation given by the European Directive 98-83, applicable in December 2013. An appropriate adsorbent was selected through a stringent research program among a wide range of media, and is composed of a synthetic zeolite and an activated carbon. Two prototypes were developed: the first is a faucet-mounted filter which contains a fixed bed of the adsorbent and a hollow fiber bundle, while the second is an under-sink cartridge made of a porous extruded block of carbon and adsorbent. Both are able to treat at least 1,000 litres of any water containing on average 100 to 150 μg Pb.L-1, by lowering the lead concentration below 10 μg.L-1. Once their safety considerations were addressed by an independent laboratory according to the French Ministry of Health recommendations, 20 prototypes were installed at consumers' taps in northeastern France. Their performance in terms of lead removal, HPC control and bad taste and odor reduction was followed for 6 months. This field testing program resulted in the validation of both prototypes which meet the new French Ministry of Health recommendations and assures that the filtered water is fully ED 98-83 compliant. Their commercialization will be launched first in France in middle 2002.

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INCREASING FLOOD MITIGATION THROUGH THE USE OF BONUS CAPACITY OF DRINKING WATER RESERVOIRS

10.1130/abs/2016am-287339 ◽

2016 ◽

Author(s):

Joshua C. Galster ◽

◽

Matthew Del Ciello

Keyword(s):

Drinking Water ◽

Flood Mitigation ◽

Water Reservoirs

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Drinking-water Quality Risk Assessment Based on Parameters with Organoleptic (Taste and Odor) Effects Observed in Water from Surface Water Intake and Infiltration Water Intake Facilities

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/670/1/012046 ◽

2021 ◽

Vol 670 (1) ◽

pp. 012046

Author(s):

A V Yalaletdinova ◽

E A Kantor ◽

Yu O Galimova

Keyword(s):

Water Quality ◽

Risk Assessment ◽

Drinking Water ◽

Surface Water ◽

Water Intake ◽

Drinking Water Quality ◽

Taste And Odor ◽

Quality Risk

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Production of 2-Methyliso-Borneol by Two Benthic Cyanophyta

Water Science & Technology ◽

10.2166/wst.1983.0145 ◽

1983 ◽

Vol 15 (6-7) ◽

pp. 211-220 ◽

Cited By ~ 20

Author(s):

G Izaguirre ◽

C J Hwang ◽

S W Krasner ◽

M J McGuire

Keyword(s):

Mass Spectrometry ◽

Gas Chromatography ◽

Drinking Water ◽

Closed Loop ◽

Water Supply Systems ◽

Source Water ◽

Analysis Method ◽

Sediment Samples ◽

Taste And Odor ◽

Supply Systems

Two Oscillatoria strains have been isolated from three different water supply systems in California that have experienced taste and odor problems in their drinking water. The algae were obtained from sediment samples and rock scrapings from source-water reservoirs. Unialgal cultures, free of actinomycetes, were purged using the closed-loop stripping analysis method, and the resulting extracts were analyzed by gas chromatography and mass spectrometry. The organisms, Oscillatoriacurviceps and O.tenuis variant levis Gardner, yielded 2-methylisoborneol (MIB) at 60–150 µg/l. In both instances, MIB had previously been identified in the sediment samples from which the organisms were isolated. O.curviceps was implicated in a taste and odor episode involving MIB in a major reservoir during two consecutive summers.

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