TY - JOUR
T1 - Backwashing conditions of novel bio-amended sands and its enhanced filtration efficiency
AU - Li, Dongmei
AU - Lin, Jieman
AU - Wang, Yizhi
AU - Zhang, Wen
AU - Li, Shaoxiu
N1 - Funding Information:
This work was supported by National Natural Science Foundation of China [grant number 51378129], [grant number 51108094]; the Natural Science Foundation of Guangdong Province [grant number 2015A030313494]; the Science & Technology bureau Foundation of Guangdong Province [grant number 2013B020413002]; Chancheng district [grant number 2013B1007].
Publisher Copyright:
© 2015 Taylor & Francis.
PY - 2016/3/4
Y1 - 2016/3/4
N2 - 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.
AB - 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.
KW - Ammonia-nitrogen
KW - backwashing condition optimization
KW - bio-amended sands
KW - bio-bare quartz sands
KW - filtration efficiency
KW - morphological characteristics
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U2 - 10.1080/02772248.2015.1123491
DO - 10.1080/02772248.2015.1123491
M3 - Article
AN - SCOPUS:84956789273
SN - 0277-2248
VL - 98
SP - 492
EP - 499
JO - Toxicological and Environmental Chemistry
JF - Toxicological and Environmental Chemistry
IS - 3-4
ER -