A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
SPENT filter backwash water CONTAMINANTS AND TREATMENT STRATEGIES
Twenty‐five representative water treatment plants were surveyed to compare differences in microbial, physical, and chemical water quality of raw waters and spent filter backwash waters (SFBWs). On the basis of the observed Giardia and Cryptosporidium levels, it was determined that a recycle ratio of 5–10% would be sufficient to minimize the impact of protozoa on ambient raw water. Using the cell culture–polymerase chain reaction method, infectious Cryptosporidium oocysts were observed in raw water and SFBW samples. The presence of particles in the SFBW samples increased the potassium permanganate demand by a factor of 5.5 and the chlorine dioxide demand by a factor of 4.0. However, the presence of particles in SFBWs did not affect the inactivation of Cryptosporidium. Conventional treatment of SFBW with polymers resulted in excellent removal of turbidity, particles, and microorganisms. A backwashable depth filter can be used in place of a conventional filter for control of Cryptosporidium in clarified SFBW.
SPENT filter backwash water CONTAMINANTS AND TREATMENT STRATEGIES
Twenty‐five representative water treatment plants were surveyed to compare differences in microbial, physical, and chemical water quality of raw waters and spent filter backwash waters (SFBWs). On the basis of the observed Giardia and Cryptosporidium levels, it was determined that a recycle ratio of 5–10% would be sufficient to minimize the impact of protozoa on ambient raw water. Using the cell culture–polymerase chain reaction method, infectious Cryptosporidium oocysts were observed in raw water and SFBW samples. The presence of particles in the SFBW samples increased the potassium permanganate demand by a factor of 5.5 and the chlorine dioxide demand by a factor of 4.0. However, the presence of particles in SFBWs did not affect the inactivation of Cryptosporidium. Conventional treatment of SFBW with polymers resulted in excellent removal of turbidity, particles, and microorganisms. A backwashable depth filter can be used in place of a conventional filter for control of Cryptosporidium in clarified SFBW.
SPENT filter backwash water CONTAMINANTS AND TREATMENT STRATEGIES
Arora, Harish (author) / Di Giovanni, George (author) / Lechevallier, Mark (author)
Journal ‐ American Water Works Association ; 93 ; 100-112
2001-05-01
13 pages
Article (Journal)
Electronic Resource
English
Giardia , Protozoa , Turbidity , Chemicals , Filters , Cryptosporidium , Water Treatment , Contaminants , Water Quality , Backwash , Polymers
Characterization and destabilization of spent filter backwash water particles
| British Library Conference Proceedings | 2002
Application of submerged membranes for the treatment of spent filter backwash water
| Online Contents | 2007
Treatment of Spent Filter Backwash Wastewater Using Dissolved Air Flotation Process
| British Library Conference Proceedings | 2006
Particle separation - Characterization and destabilization of spent filter backwash water particles
| Online Contents | 2002