scholarly journals Adapting a drinking water treatment technology for arsenic removal to the context of a small, low-income California community

2021 ◽  
Vol 204 ◽  
pp. 117595
Author(s):  
Sara Glade ◽  
Siva RS Bandaru ◽  
Mohit Nahata ◽  
Jay Majmudar ◽  
Ashok Gadgil
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Low Income ◽  
Arsenic Removal ◽  
Drinking Water Treatment ◽  
Treatment Technology ◽  
Water Treatment Technology

Efficiency of Removal of Iron, Manganese, Ammonium and Organic Matter from Groundwater

2017 ◽  
Author(s):  
Ramunė Albrektienė ◽  
Mindaugas Rimeika
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Organic Compounds ◽  
Quartz Sand ◽  
Drinking Water Treatment ◽  
Ammonium Ions ◽  
Treatment Technology ◽  
Well Field ◽  
Water Treatment Technology ◽  
Iron Manganese

The acceptable concentrations in groundwater are usually in excess of iron, ammonium and manganese. These compounds are inefficiently removed by means of ordinary technologies of ammonium ions, iron and manganese compounds removal from groundwater (water aeration and filtration through granular filter fillings) where groundwater contains high concentrations of organic compounds. Increased concentrations of organic compounds in groundwater occur in well fields where exploited aquifers have contact with surface water wells and are supplemented with water from open water bodies. Such well field is located in the town of Nida (Lithuania). The norms permitted by Council directive 98/83/EC on the quality of water intended for human consumption are exceeded by iron, ammonium, manganese and organic compounds in this well field. The present study examines the efficiency of drinking water treatment technology of three-stage filtration with aeration and insertion of coagulant (polyaluminum chloride) where ammonium ions, iron, manganese and organic compounds are removed from groundwater in an integral manner. Three fillings were used for filtration: quartz sand, zeolite and quartz sand with oxidizing bacteria. The drinking water treatment technology examined removes ammonium ions, iron, manganese and organic compounds from groundwater in an integral manner until the requirements of the norms of directive 98/83/EC are achieved.

scholarly journals Potential Repair of Escherichia coli DNA following Exposure to UV Radiation from Both Medium- and Low-Pressure UV Sources Used in Drinking Water Treatment

2002 ◽  
Vol 68 (7) ◽  
pp. 3293-3299 ◽  
Author(s):  
J. L. Zimmer ◽  
R. M. Slawson
Keyword(s):  
Escherichia Coli ◽  
Drinking Water ◽  
Water Treatment ◽  
Uv Radiation ◽  
Drinking Water Treatment ◽  
Low Pressure ◽  
Plate Count ◽  
Treatment Technology ◽  
Medium Pressure ◽  
Uv Lamp

ABSTRACT The increased use of UV radiation as a drinking water treatment technology has instigated studies of the repair potential of microorganisms following treatment. This study challenged the repair potential of an optimally grown nonpathogenic laboratory strain of Escherichia coli after UV radiation from low- and medium-pressure lamps. Samples were irradiated with doses of 5, 8, and 10 mJ/cm2 from a low-pressure lamp and 3, 5, 8, and 10 mJ/cm2 from a medium-pressure UV lamp housed in a bench-scale collimated beam apparatus. Following irradiation, samples were incubated at 37°C under photoreactivating light or in the dark. Sample aliquots were analyzed for up to 4 h following incubation using a standard plate count. Results of this study showed that E. coli underwent photorepair following exposure to the low-pressure UV source, but no repair was detectable following exposure to the medium-pressure UV source at the initial doses examined. Minimal repair was eventually observed upon medium-pressure UV lamp exposure when doses were lowered to 3 mJ/cm2. This study clearly indicates differences in repair potential under laboratory conditions between irradiation from low-pressure and medium-pressure UV sources of the type used in water treatment.

Survey on full-scale drinking water treatment plants for arsenic removal in Italy

2014 ◽  
Vol 9 (1) ◽  
pp. 42-51 ◽  
Author(s):  
S. Sorlini ◽  
F. Gialdini ◽  
M. C. Collivignarelli
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Arsenic Removal ◽  
Ferric Hydroxide ◽  
Drinking Water Treatment ◽  
Chemical Precipitation ◽  
Ionic Form ◽  
Ionic Exchange ◽  
Water Characteristics ◽  
Water Treatment Plants

Arsenic in drinking water causes severe health effects and it is widely diffused in groundwater around the world. This paper presents the results of a survey about the main arsenic removal technologies employed in Italy and the main features in the management of real treatment plants. 19 drinking water treatment plans were involved in this study. The specific aspects analysed in this survey were: type of technologies applied in the drinking water treatment plants (water characteristics, ionic form of As in raw water, etc.), technical aspects (chemical dosage, treatment steps, hydraulic load, retention time, etc.), operational aspects (backwashing, media regeneration, management of residues, etc.) and costs of these technologies. In Italy, the main technologies employed are chemical precipitation (10 plants) and adsorption with granular ferric hydroxide (GFH) (six plants). Two of these plants employ both chemical precipitation and GFH. Moreover, there are some applications of adsorption on titanium dioxide (two plants), reverse osmosis (two plants) and ionic exchange (two plants).

Sign in / Sign up

Export Citation Format

Share Document