Abstract
Increasing use of engineered nanomaterials (ENMs) inevitably leads to their potential release to the sewer system. The co-removal of nano fullerenes (nC60) and nanosilver as well as their impact on COD removal were studied in biological sequencing batch reactors (SBR) for a year. When dosing nC60 at 0.07-2mgL-1, the SBR removed greater than 95% of nC60 except for short-term interruptions occurred (i.e., dysfunction of bioreactor by nanosilver addition) when nC60 and nanosilver were dosed simultaneously. During repeated 30-d periods of adding both 2mgL-1 nC60 and 2mgL-1 nanosilver, short-term interruption of SBRs for 4d was observed and accompanied by (1) reduced total suspended solids in the reactor, (2) poor COD removal rate as low as 22%, and (3) decreased nC60 removal to 0%. After the short-term interruption, COD removal gradually returned to normal within one solids retention time. Except for during these "short-term interruptions", the silver removal rate was above 90%. A series of bottle-point batch experiments was conducted to determine the distribution coefficients of nC60 between liquid and biomass phases. A linear distribution model on nC60 combined with a mass balance equation simulated well its removal rate at a range of 0.07-0.76mgL-1 in SBRs. This paper illustrates the effect of "pulse" inputs (i.e., addition for a short period of time) of ENMs into biological reactors, demonstrates long-term capability of SBRs to remove ENMs and COD, and provides an example to predict the removal of ENMs in SBRs upon batch experiments.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 115-121 |
| Number of pages | 7 |
| Journal | Chemosphere |
| Volume | 125 |
| DOIs | |
| State | Published - Apr 1 2015 |
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Keywords
- Nano fullerene
- Nanosilver
- SBR
- Waste water treatment
ASJC Scopus subject areas
- Environmental Chemistry
- Chemistry(all)
Cite this
Simultaneous removal of nanosilver and fullerene in sequencing batch reactors for biological wastewater treatment. / Yang, Yu; Wang, Yifei; Hristovski, Kiril; Westerhoff, Paul.
In: Chemosphere, Vol. 125, 01.04.2015, p. 115-121.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Simultaneous removal of nanosilver and fullerene in sequencing batch reactors for biological wastewater treatment
AU - Yang, Yu
AU - Wang, Yifei
AU - Hristovski, Kiril
AU - Westerhoff, Paul
PY - 2015/4/1
Y1 - 2015/4/1
N2 - Increasing use of engineered nanomaterials (ENMs) inevitably leads to their potential release to the sewer system. The co-removal of nano fullerenes (nC60) and nanosilver as well as their impact on COD removal were studied in biological sequencing batch reactors (SBR) for a year. When dosing nC60 at 0.07-2mgL-1, the SBR removed greater than 95% of nC60 except for short-term interruptions occurred (i.e., dysfunction of bioreactor by nanosilver addition) when nC60 and nanosilver were dosed simultaneously. During repeated 30-d periods of adding both 2mgL-1 nC60 and 2mgL-1 nanosilver, short-term interruption of SBRs for 4d was observed and accompanied by (1) reduced total suspended solids in the reactor, (2) poor COD removal rate as low as 22%, and (3) decreased nC60 removal to 0%. After the short-term interruption, COD removal gradually returned to normal within one solids retention time. Except for during these "short-term interruptions", the silver removal rate was above 90%. A series of bottle-point batch experiments was conducted to determine the distribution coefficients of nC60 between liquid and biomass phases. A linear distribution model on nC60 combined with a mass balance equation simulated well its removal rate at a range of 0.07-0.76mgL-1 in SBRs. This paper illustrates the effect of "pulse" inputs (i.e., addition for a short period of time) of ENMs into biological reactors, demonstrates long-term capability of SBRs to remove ENMs and COD, and provides an example to predict the removal of ENMs in SBRs upon batch experiments.
AB - Increasing use of engineered nanomaterials (ENMs) inevitably leads to their potential release to the sewer system. The co-removal of nano fullerenes (nC60) and nanosilver as well as their impact on COD removal were studied in biological sequencing batch reactors (SBR) for a year. When dosing nC60 at 0.07-2mgL-1, the SBR removed greater than 95% of nC60 except for short-term interruptions occurred (i.e., dysfunction of bioreactor by nanosilver addition) when nC60 and nanosilver were dosed simultaneously. During repeated 30-d periods of adding both 2mgL-1 nC60 and 2mgL-1 nanosilver, short-term interruption of SBRs for 4d was observed and accompanied by (1) reduced total suspended solids in the reactor, (2) poor COD removal rate as low as 22%, and (3) decreased nC60 removal to 0%. After the short-term interruption, COD removal gradually returned to normal within one solids retention time. Except for during these "short-term interruptions", the silver removal rate was above 90%. A series of bottle-point batch experiments was conducted to determine the distribution coefficients of nC60 between liquid and biomass phases. A linear distribution model on nC60 combined with a mass balance equation simulated well its removal rate at a range of 0.07-0.76mgL-1 in SBRs. This paper illustrates the effect of "pulse" inputs (i.e., addition for a short period of time) of ENMs into biological reactors, demonstrates long-term capability of SBRs to remove ENMs and COD, and provides an example to predict the removal of ENMs in SBRs upon batch experiments.
KW - Nano fullerene
KW - Nanosilver
KW - SBR
KW - Waste water treatment
UR - http://www.scopus.com/inward/record.url?scp=84923568552&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84923568552&partnerID=8YFLogxK
U2 - 10.1016/j.chemosphere.2014.12.003
DO - 10.1016/j.chemosphere.2014.12.003
M3 - Article
C2 - 25532763
AN - SCOPUS:84923568552
VL - 125
SP - 115
EP - 121
JO - Chemosphere
JF - Chemosphere
SN - 0045-6535
ER -