Backwashing conditions of novel bio-amended sands and its enhanced filtration efficiency

Document Type

Article

Publication Date

3-4-2016

Abstract

Novel amended sands enveloped in bio-film (B-NAS) were employed to treat the ammonium-nitrogen (NH4 +-N) in raw water. The backwashing conditions, treatment efficiency, and morphological characteristics of the B-NAS were investigated via bio-filtration experiments. The bare quartz sands (BQS) and NAS exhibited biomass levels of 24.32 nmol-P g-sand -1 and 83.71 nmol-P g-sand−1, respectively. B-NAS was most effective when air alone (at a strength of qair,I = 7 L s−1 m−2 for tair,I = 6 min), a combination of air–water (at strengths of qair,II = 7 L s−1 m−2 and qwater,II = 5 L s−1 m−2 for tair-water,II = 6 min), and water alone (at a strength of qwater,III = 7 L s−1 m−2 for twater,III = 4 min) were employed alternately for flushing. The proposed B-NAS with nano-pores surface effectively (1) resisted the shock produced by high NH4 +-N concentrations (4 mg L−1), (2) exhibited removal rate of 96%, and (3) a high capturing capacity indicated by a high head loss (126.5 cm) for 72 hr.

Identifier

84956789273 (Scopus)

Publication Title

Toxicological and Environmental Chemistry

External Full Text Location

https://doi.org/10.1080/02772248.2015.1123491

e-ISSN

10290486

ISSN

02772248

First Page

492

Last Page

499

Issue

3-4

Volume

98

Grant

51108094

Fund Ref

National Natural Science Foundation of China

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