Variations in dissolved organic nitrogen concentration in biofilters with different media during drinking water treatment.

Abstract:

:Dissolved organic nitrogen (DON) is potential precursor of disinfection byproducts (DBPs), especially nitrogenous DBPs. In this study, we investigated the impact of biofilters on DON concentration changes in a drinking water plant. A small pilot plant was constructed next to a sedimentation tank in a drinking water plant and included activated carbon, quartz sand, anthracite, and ceramsite biofilters. As the biofilter layer depth increased, the DON concentration first decreased and then increased, and the variation in DON concentration differed among the biofilters. In the activated carbon biofilter, the DON concentration was reduced by the largest amount in the first part of the column and increased by the largest amount in the second part of the column. The biomass in the activated carbon filter was less than that in the quartz sand filter in the upper column. The heterotrophic bacterial proportion among bacterial flora in the activated carbon biofilter was the largest, which might be due to the significant reduction in DON in the first part of the column. Overall, the results indicate that the DON concentration in biofiltered water can be controlled via the selection of appropriate biofilter media. We propose that a two-layer biofilter with activated carbon in the upper layer and another media type in the lower layer could best reduce the DON concentration.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Zhang H,Zhang K,Jin H,Gu L,Yu X

doi

10.1016/j.chemosphere.2014.10.092

subject

Has Abstract

pub_date

2015-11-01 00:00:00

pages

652-8

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(14)01449-0

journal_volume

139

pub_type

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