Variations of bacterial 16S rDNA phylotypes prior to and after chlorination for drinking water production from two surface water treatment plants

2009 ◽  
Vol 37 (2) ◽  
pp. 117-128 ◽  
Author(s):  
Jean-Baptiste Poitelon ◽  
Michel Joyeux ◽  
Bénédicte Welté ◽  
Jean-Pierre Duguet ◽  
Eric Prestel ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Surface Water ◽  
16S Rdna ◽  
Water Production ◽  
Surface Water Treatment ◽  
Water Treatment Plants ◽  
Drinking Water Production

Surface water treatment using microfiltration for drinking water ‎production in Egypt

2018 ◽  
Vol 102 ◽  
pp. 71-75
Author(s):  
Usama F. Mahmoud ◽  
Emad S. Elmolla ◽  
Haitham Mahmoud
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Surface Water ◽  
Water Production ◽  
Surface Water Treatment ◽  
Drinking Water Production

Enhanced particle removal in drinking water treatment plants – case studies

2000 ◽  
Vol 41 (7) ◽  
pp. 135-142
Author(s):  
P. Lipp ◽  
G. Baldauf
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Case Studies ◽  
Surface Waters ◽  
Drinking Water Treatment ◽  
Particle Removal ◽  
Water Production ◽  
Water Treatment Plants ◽  
Drinking Water Production

Measurements of parasites in surface waters in Germany showed that their presence is widely spread. Concentrations may reach values up to a maximum of 50 cysts per 100 l. Normally raw waters used for drinking water production show much lower values. In order to ensure sufficient parasite removal in drinking water treatment plants an enhancement of particle removal is required. For filtration processes parameters influencing particle removal are filter media, filtration velocity, flocculant dosage, preozonationand filter back wash. Moderate filtration conditions show best results. Three case studies show that preozonation, optimized energy input and use of flocculants improve particle removal. One case study shows results of the first ultrafiltration plant in Germany treating reservoir and spring water for drinking water production.

Distribution and removal of Giardia and Cryptosporidium in water supplies in Germany

1998 ◽  
Vol 37 (2) ◽  
pp. 9-18 ◽  
Author(s):  
Panagiotis Karanis ◽  
Dirk Schoenen ◽  
H. M. Seitz
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Surface Water ◽  
Water Samples ◽  
Wash Water ◽  
Raw Water ◽  
Water Supplies ◽  
Surface Water Treatment ◽  
Water Treatment Plants ◽  
Drinking Water Samples

This study has been conducted, to estimate the distribution of Giardia and Cryptosporidium in German water supplies and the removal efficiency of surface water treatment plants for Giardia and Cryptosporidium by conventional treatment. Water samples from six surface water treatment plants in different parts of Germany were simoultaneously examined for Giardia and Cryptosporidium. Investigations for both parasites were carried out in the period from July 1993 until December 1995. The results confirmed the occurrence of Giardia and Cryptosporidium in surface and raw water, in intermediate steps after treatment, in back wash water, in the first filtrate and in final water. Giardia or Cryptosporidium or both have been found in 76.2% of the investigated raw water sources. The average number of the detected Giardia cysts was 88.2/100 1 (max. 1314/100 1), and the average number of Cryptosporidium oocysts was 116/100 1 (max. 1081/100 1). In the intermediate steps (including flocculation and several steps of filtration), Giardia or Cryptosporidium or both have been found in 33.3% (50/150) of the samples. 14.9% of drinking water samples (7/47) were positive for Giardia (max. 16.8/100 1) and 29.8% (14/47) were positive for Cryptosporidium (max. 20.8/100 1). Overall, Giardia and Cryptosporidium, or both were detected in 38.3% of the drinking water samples. The parasites have been found in nearly all of the investigated backwash water samples. The filtrate of a rapid sand filter was analysed immediately after filter backwashing during the ripening period of the filter. Good elimination results were obtained by optimizing relevant water treatment process, but a low flocculant dose following sudden variation in the raw water quality, causes a breakthrough of Cryptosporidium into the treated water. Although water treatment technologies are effective to remove Giardia and Cryptosporidium, the results clearly show that Giardia and Cryptosporidium evade the filter barries in the absence of visible treatment deficiencies and low turbitidy level, and contaminate final water.

Barcelona's water supply improvement: the brine collector of the Llobregat river

1994 ◽  
Vol 30 (10) ◽  
pp. 221-227 ◽  
Author(s):  
Jordi Martín-Alonso
Keyword(s):  
Drinking Water ◽  
Surface Water ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Salt Mine ◽  
Water Production ◽  
Public Work ◽  
Drinking Water Production ◽  
Llobregat River

The Llobregat is a 156 km long river, which supplies 35% of the Barcelona's drinking water needs from the Sant Joan Despí Water Treatment Plant. Since the establishment of the Salt Mine Works in the Llobregat basin in 1923, a progressive salinization of the water sources has been recorded. The operation of the Brine Collector, as a public work carried out by Aigües de Barcelona (AGBAR), started in 1989; it enabled a very significant improvement in the quality of the surface water used for drinking-water production.

Dissolved air flotation in drinking water production

2001 ◽  
Vol 43 (8) ◽  
pp. 9-18 ◽  
Author(s):  
T. Schofield
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Potable Water ◽  
Water Production ◽  
Process Technology ◽  
Dissolved Air Flotation ◽  
Drinking Water Production ◽  
Air Flotation ◽  
Potable Water Treatment ◽  
Dissolved Air

Dissolved Air Flotation (DAF) has become increasingly important in the field of potable water treatment, as a preferred option for treating upland and stored lowland waters. This paper outlines the development of dissolved air flotation (DAF) in potable water treatment, the benefits and disadvantages and the recent advances that has taken the process technology from an art to a science.

scholarly journals Genotoxicity of source, treated and distributed water from four drinking water treatment plants supplied by surface water in Sardinia, Italy

2020 ◽  
Vol 185 ◽  
pp. 109385 ◽  
Author(s):  
Donatella Feretti ◽  
Mattia Acito ◽  
Marco Dettori ◽  
Elisabetta Ceretti ◽  
Cristina Fatigoni ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Surface Water ◽  
Drinking Water Treatment ◽  
Water Treatment Plants
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