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Role of methanogenesis on the biotransformation of organic micropollutants during anaerobic digestion

Abstract

Several studies showed that some organic micropollutants (OMPs) are biotransformed during anaerobic digestion (AD). Yet, most of them aim at reporting removal efficiencies instead of understanding the biotransformation process. Indeed, how each of the main AD stages (i.e., hydrolysis, acidogenesis, and methanogenesis) contribute to OMP biotransformation remains unknown. This study focuses on investigating the role of methanogenesis, the most characteristic step of AD, to OMP removal. More specifically, the sorption and the biotransformation of 20 OMPs by methanogenic biomass were analyzed determining their concentrations in both liquid and solid phases. Sorption onto methanogenic biomass displayed a similar behavior as reported for digested sludge. Most of the OMPs were biotransformed to a medium extent (35–70%) and only sulfamethoxazole was completely removed. Comparing these results with those reported for the complete AD process, methanogenesis was proven to play a key role, accounting for more than 50% of the OMP biotransformation (except for roxithromycin) during AD. An increase in the organic loading rate from 1 to 2 g COD/L d, typical loads employed in sewage sludge anaerobic digesters, did not exert a clear cometabolic effect on the OMPs biotransformation. It is hypothesized that biotransformation occurs in both liquid and solid phases because no link between the partition coefficient (Kd) and the overall biotransformation efficiency was found. These findings allow a better understanding of the OMPs fate under anaerobic conditions, which is necessary to design efficient biological mitigation strategies

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Role of methanogenesis on the biotransformation of organic micropollutants during anaerobic digestion

Author: González Gil, Lorena; Mauricio Iglesias, Miguel; Serrano, Denisse; Lema Rodicio, Juan Manuel; Carballa Arcos, Marta
Publisher: Elsevier
Year: 2017
DOI: 10.1016/j.scitotenv.2017.12.004
Source: https://minerva.usc.es/bitstreams/57a5ba15-60aa-4402-8827-716f32b8b17d/download
SUPPLEMENTARY DATA
Role o me hanogenesis on he bio ans o ma ion o o ganic mic opollu an s
du ing anae obic diges ion
Lo ena Gonzalez-Gil *, a, Miguel Mau icio-Iglesias a, Denisse Se ano a, b, Juan M. Lema
a, Ma a Ca balla a
a Depa men o Chemical Enginee ing, School o Enginee ing, Uni e sidade de
San iago de Compos ela, Rúa Lope Gómez de Ma zoa, E-15782 San iago de
Compos ela, Spain
b Depa men o Wa e and En i onmen al Sciences, Ins i u o Tecnológico de Sono a, 5
de eb e o 818 su , Colonia Cen o, 85000 Ciudad Ob egón, México
*Co esponding Au ho
E-mail add esses: [email p o ec ed], [email p o ec ed],
[email p o ec ed], [email p o ec ed], ma[email p o ec ed]
1
Con en s
S1. Physicochemical cha ac e is ics o selec ed OMPs ........................................... 2
S2. Pa ame e es ima ion .......................................................................................... 3
S3. Analysis o o ganic mic opollu an s .................................................................. 4
S4. Me hanogenic eac o s ope a ion ....................................................................... 5
S5. So p ion o OMPs in diges ed sludge ................................................................ 7
S6. Bio ans o ma ion kine ics ................................................................................. 7
S7. Bio ans o ma ion a e cons an s in he me hanogenic s ep ............................ 14
S8. Bio ans o ma ion phase .................................................................................. 15
S9. Remo al o OMPs du ing sewage sludge AD ................................................. 16
Re e ences .................................................................................................................. 17
2
S1. Physicochemical cha ac e is ics o selec ed OMPs
Table S1. Applica ion and main physicochemical p ope ies o he selec ed OMPs.
OMP
Applica ion
MW
(g/mol)
s
(mg/L)
H
(a m m3/mol)
pKa
log Kow
ERY
An ibio ic
733.9
1.4
5.4·10-29
8.9
3.1
ROX
An ibio ic
837.1
0.02
5.0·10-31
9.1
2.8
SMX
An ibio ic
253.3
610
6.4·10-13
6.2
0.9
TMP
An ibio ic
290.3
400
2.4·10-14
7.1
0.9
FLX
An idep essan
309.3
60
8.9·10-8
9.8
4.1
CBZ
An icon ulsan
236.3
112
1.1·10-10
15.9
2.5
DZP
Anxioly ic
284.7
50
3.6·10-9
3.4
2.8
E1
Es ogen
270.4
30
3.8·10-10
10.3
3.1
E2
Es ogen
272.4
3.6
3.6·10-11
10.3
4.0
EE2
Con acep i e/
es ogen
296.4
11.3
7.9·10-12
10.3
3.7
ADBI
F ag ance
244.4
0.22
2.1·10-4
‒
5.9
HHCB
F ag ance
258.4
1.8
1.3·10-4
‒
5.9
AHTN
F ag ance
258.4
0.21
2.6·10-4
‒
5.8
IBP
An i-in lamma o y
206.3
21
1.5·10-6
4.9
4.0
NPX
An i-in lamma o y
230.3
15.9
3.4·10-10
4.2
3.2
DCF
An i-in lamma o y
296.2
2.4
4.7·10-12
4.2
4.2
OP
Su ac an
206.3
3.1
8.5·10-6
≈10
5.5
NP
Su ac an
220.4
7.0
3.4·10-5
≈10
5.8
TCS
An isep ic
289.5
10
5.0·10-9
7.7
4.7
BPA
Fungicide/plas icize
228.3
120
1.0·10-11
10.1
3.3
Molecula weigh (MW), Hen y’s law cons an (H), solubili y a 25 °C (s), acid dissocia ion cons an (pKa), oc anol-
wa e coe icien (Kow).
Da a ob ained om D ugBank and PhysP op da abases and om Va hanicko a e al. (1995).
3
S2. Pa ame e es ima ion
The pseudo- i s o de kine ic cons an was es ima ed by leas -squa e i ing o he esul s
o he kine ic expe imen s o equa ion S1.
𝑘𝑏𝑖𝑜𝑙 =a gmin ∑(𝐶𝑇(𝑡)−𝐶𝑇,𝑒𝑥𝑝)2
Equa ion S1
whe e CT was ob ained acco ding o equa ion 2 o he manusc ip :
𝐶𝑇= 𝐶0·𝑒(− 1
𝐻𝑅𝑇−𝑘𝑏𝑖𝑜𝑙·𝑋𝑉𝑆𝑆)·𝑡
To ob ain a obus es ima ion o kbiol a boo s ap p ocedu e was ollowed o de e mine he
expec ed alue and he con idence in e al o he pa ame e . The p ocedu e was done as
ollows:
i) Es ima e he esiduals (e) o equa ion S1 by equa ion S2, which a e used o simula e
he expe imen al e o in he measu emen s;
𝑒 =𝐶𝑇(𝑡)−𝐶𝑇,𝑒𝑥𝑝
Equa ion S2
ii) Simula e new expe imen al esul s (C*T,exp) by andomly adding some o he esiduals
o he expe imen al da a;
𝐶∗𝑇,𝑒𝑥𝑝 =𝐶𝑇,𝑒𝑥𝑝 +𝑒𝑗 whe e ej is a andom a iable ej
∈
e
Equa ion S3
iii) Ca y ou he leas squa e es ima ion o k*biol o he new simula ed da a by using
equa ion S1.
i ) I e a e h ough s eps ii) and iii) un il con e gence (numbe o i e a ions = 1000) on a
dis ibu ion o kbiol and use his dis ibu ion o ind he expec ed alue and i s con idence
in e al.
4
S3. Analysis o o ganic mic opollu an s
Table S2. Limi s o quan i ica ion (LOQ) and eco e y anges (n=3) o OMPs in he
liquid and solid phase o he me hanogenic sludge.
LOQ
Reco e y ange (%)
OMP
Liquid
(ng/L)
Solid
(ng/g)
Liquid
Solid
ERY
3
0.6
90-110
65-80
ROX
3
0.6
80-90
55-65
SMX
15
3
85-90
55-60
TMP
15
3
70-75
55-60
FLX
3
0.6
30-35
45-50
CBZ
15
3
65-75
70-80
DZP
15
3
50-60
60-70
E1
30
6
40-50
60-70
E2
30
6
60-70
60-70
EE2
30
6
60-80
60-75
ADBI
150
30
45-55
120-150
HHCB
150
30
40-60
120-150
AHTN
150
30
35-50
130-160
IBP
60
12
130-150
120-140
NPX
75
15
110-120
100-120
DCF
300
60
120-140
130-140
OP
60
12
60-70
120-140
NP
60
12
60-70
120-140
TCS
150
30
55-65
110-130
BPA
75
15
110-120
70-80

5
S4. Me hanogenic eac o s ope a ion
Figu e S1. Pe o mance o he me hanogenic eac o s (MR1 le side and MR2 igh side) du ing he whole ope a ion. O ganic loading a e (OLR)
and me hane p oduc ion (CH4) a e ep esen ed in he uppe g aphs, while pH, ola ile suspended solids (VSS) and in e media e/ o al alkalini y a io
(IA/TA) a e depic ed in he bo om g aphs. G ey a eas highligh he pe iods when he kine ic expe imen s wi h OMPs we e conduc ed.
6
Table S3. A e age eeding cha ac e is ics o me hanogenic eac o s du ing bo h s eady-
s a e ope a ional s ages (OLR=1 and 2 g COD/L d).
OLR=1 g COD/L d
OLR=2 g COD/L d
pH
6.3 ± 0.7
6.4 ± 0.6
Ace ic acid (HAc, g/L)
4.7 ± 0.3
9.5 ± 0.4
P opionic acid (g/L)
1.7 ± 0.1
3.3 ± 0.1
Bu y ic acid (g/L)
1.4 ± 0.1
2.7 ± 0.1
To al VFA (g HAceq/L)
7.9 ± 0.7
15.9 ± 0.5
COD (g/L)
9.5 ± 1.0
18.8 ± 1.0
NH4Cl (g/L)
0.6
0.6
KH2PO4 (g/L)
0.4
0.4
T ace concen a ions o mic o-nu ien s (Fe, Ca, Mg, C , Co, Cu, Mn, Mo,
Ni, Se, Zn, B) we e added acco ding o Angelidaki and Sande s (2004).
7
S5. So p ion o OMPs in diges ed sludge
Table S4. Pa i ioning coe icien s (log Kd) epo ed o anae obically diges ed sludge.
The a e age ange ep esen s he minimum and he maximum alues om li e a u e.
log Kd
OMP
Gonzalez-Gil
e al. (2016)
Ca balla
e al. (2007)
Na umiya
e al. (2013)
Cla a
e al. (2011)
I ashechkin e
al. (2004)
A e age
ange
TCS
3.56-4.35
3.56-4.35
AHTN
4.22-4.86
3.7-4.43
2.60-2.90
2.60-4.86
HHCB
2.58-5.14
3.45-4.3
2.58-5.14
FLX
2.44-3.44
2.44-3.44
E2
2.22-3.34
2.30-2.83
2.22-3.34
E1
1.76-2.91
2.18-2.77
1.76-2.91
BPA
2.09-2.30
2.09-2.30
TMP
1.92-2.86
1.92-2.86
ERY
1.60-3.10
1.60-3.10
ROX
2.52-3.97
1.14-1.92
1.90-3.30
1.14-3.97
EE2
1.21-1.40
2.08-2.85
1.21-2.85
DZP
1.85-1.88
1.85-1.88
DCF
1.26-2.18
1.90-2.20
1.26-2.20
CBZ
1.60-2.27
1.31-1.83
1.60-2.00
1.31-2.27
SMX
0.77-1.79
0.77-1.79
IBP
1.03-1.76
1.00-1.78
1.00-1.78
NPX
1.03-1.71
1.03-1.71
S6. Bio ans o ma ion kine ics
The concen a ions measu ed in he liquid and solid phase o he me hanogenic e luen
du ing he h ee kine ic expe imen s a e displayed in Figu es S2. An a e age
me hanogenic kine ics ob ained om he h ee expe imen s is shown as well. Excep o
NP, EE2, SMX, TMP, and NPX, he esul ing a e age alues p esen ed a low de ia ion,
meaning ha he concen a ions o OMPs measu ed in h ee kine ic expe imen s we e
qui e simila . Mo eo e , con inuous lines depic he concen a ion pa e ns o OMPs in
bo h phases i solely washou was he esponsible o he emo al. The e o e, he
di e ence be ween he washou line and he expe imen al poin co esponds o
bio ans o ma ion.
8
Fig. S2a. Measu ed concen a ions in he liquid (blue diamonds) and solid (o ange squa es) phases o hyd ophobic compounds (G oup 3).
Con inuous lines show he emo al o he OMP by washou in he liquid (blue) and solid phase (o ange).
OLR=1 (Kine ic I)
OLR=1 (Kine ic II)
OLR=2 (Kine ic III)
AVERAGE
15
S8. Bio ans o ma ion phase
Fig. S3. Con ibu ion o each phase o he o al me hanogenic bio ans o ma ion o OMPs. The
appa en bio ans o ma ions measu ed in he solid (BS) and liquid phases (BL) a e ep esen ed by he
o ange, lowe ba s and by he blue, uppe ba s, espec i ely.

16
S9. Remo al o OMPs du ing sewage sludge AD
Table S6. Summa y o epo ed OMPs emo al du ing AD o sewage sludge unde simila ope a ional condi ions. The a e age emo al was
calcula ed wi h he mean alue o each e e ence and o hose cases whe e wo comple ely di e en alues we e epo ed bo h we e conside ed.
OMP
AD emo al (%)
Gonzalez-Gil
e al. (2016)
Ca balla e
al. (2007)
Na umiya e
al. (2013)
Sama as e
al. (2014)
Malmbo g &
Magné
(2015)
Cla a e al.
(2011)
Pa e akis e
al. (2012)
Be ge sen e
al. (2012)
Yang e al.
(2016)
A e age
SMX
80
100
100
‒
‒
‒
‒
‒
‒
93 ± 12
NPX
100
85
‒
85
85
‒
‒
‒
90
89 ± 7
TMP
75
‒
100
‒
100
‒
‒
‒
90
91 ± 12
NP
‒
‒
‒
35
‒
‒
0/100
‒
‒
45 ± 51
FLX
70
‒
‒
‒
0
‒
‒
30
30
33 ± 29
EE2
65
40/95
‒
‒
0
‒
20
‒
‒
44 ± 37
TCS
15
‒
30
65
‒
‒
‒
‒
50
40 ± 22
Musks
10
60
‒
‒
‒
0/45
‒
‒
‒
29 ± 28
BPA
‒
‒
‒
80
‒
‒
‒
‒
0
40 ± 40
E1+E2
0
80
‒
‒
0
‒
50
‒
‒
33 ± 39
CBZ
40
5
0
‒
15
‒
‒
‒
0
11 ± 15
DZP
50
30
‒
‒
‒
‒
‒
‒
‒
40 ± 10
ERY
‒
‒
45
‒
‒
‒
‒
‒
‒
45
ROX
85
95
65
‒
‒
‒
‒
‒
‒
82 ± 15
DCF
‒
0/80
25
95
25
‒
‒
‒
0
38 ± 41
IBP
30
45
‒
95
30
‒
‒
‒
10
42 ± 32
OP
‒
‒
‒
‒
‒
‒
‒
‒
‒
‒
Ope a ional condi ions
Con inuous diges e
Lab-scale
Lab-scale
Full-scale
Lab-scale
Lab-scale
Full-scale
Lab-scale
Lab-scale
Full-scale
OMPs spike
No
Yes
No
Yes
Yes
No
No
Yes
No
Subs a e*
MixS
MixS
MixS
MixS
MixS
SS
MixS & PS
SS
PS
Tempe a u e (°C)
37
37
30-55
37
37
37
35
37
35
HRT (d)
20-30
10-30
20-30
20
20
15-20
30
20
15-30
*MixS: mixed p ima y and seconda y sewage sludge; PS: p ima y sludge; SS: sewage sludge ( ype no speci ied).
17
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