Linked Life Data

12703853

Source:http://linkedlifedata.com/resource/pubmed/id/12703853

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2003-4-21
pubmed:abstractText
Nitrification during biological filtration is currently used in drinking water production to remove ammonia, which is the source of several water quality problems during treatment and distribution. We evaluated here the impact of backwashing on nitrification efficiency in filters used for drinking water treatment. Two different granular activated carbon (one open and one closed carbon superstructure) were tested. Ammonia removal and fixed nitrifying bacterial biomass before and after backwashing were compared in first-stage pilot filters and full-scale second-stage filters. Backwashing has a greater impact on nitrification on first-stage than an second-stage filters. Backwashing improved the ammonia removal in warm (> or = 18 degrees C) water in a first-stage filter containing an open-superstructure granular activated carbon, whereas a closed-superstructure support showed a removal capacity that is less after a regular backwashing than before, or similar to it. In cold water (< or = 4 degrees C), backwashing had a negative impact on nitrification capacity in an open-superstructure medium first-stage filter. In full-scale second-stage filters, backwashing had a slight negative impact on filter performances for both open- and closed-superstructure media at temperatures between 8 degrees C and 12 degrees C. In colder waters (< or = 3 degrees C), nitrification was very poor both before and after backwashing. Sampling of fixed, nitrifying biomass in the pilot filter columns showed that in all cases (low and high expansion backwash; both media tested) and at 20 +/- 3 degrees C the overall biomass levels remained unchanged before and after backwash. In the full-scale second-stage filters, nitrifying bionass was similar before and after backwashing for both types of media tested.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0959-3330
pubmed:author
pubmed:issnType
Print
pubmed:volume
24
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
277-87
pubmed:dateRevised
2007-3-21
pubmed:meshHeading
pubmed:year
2003
pubmed:articleTitle
Impact of backwashing on nitrification in the biological activated carbon filters used in drinking water treatment.
pubmed:affiliation
NSERC Industrial Chair on Drinking Water, Civil Engineering, Ecole Polytechnique de Montréal PO Box 6079, succ. Centre-Ville, Montréal Quebec, Canada, H3C 3A7.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't