276
Z. Liang et al.
Table 18.2 The assumed model parameter used in this study
Parameter
Symbol
Unit
Value uesd
AAO
OD
SBR
Flow rate
Q
m 3 /d
40,000
Effluent b
BOD eff
kgBOD/m 3
0.01
COD eff
kgCOD/m 3
0.05
SS eff
kgSS/m 3
0.01
N eff
kgN/m 3
0.015
P eff
kgP/m 3
0.0005
MLSS
–
kg/m 3
2.0 ~ 4.5 a1
2.0 ~ 4.5 a2
2.5 ~ 4.5 a3
MLVSS
–
kg/m 3
3.4 c
2.9 c
3.4 c
Ratio of BOD 5
and BOD u
f 1
–
0.68 (Metcalf and Eddy 1991)
Ratio of
MLVSS and
MLSS
f 2
–
0.5 ~ 0.75 a1
0.5 ~ 0.65 a2
0.75 (Fan et al.
2015)
Ratio of MLSS
and SS
f 3
–
0.7 (MEPPRC 2010)
Cell-yield
coefficient
Y
kg VSS/kg
BOD
0.68 (WEF and ASCE 1998)
Endogenous
decay
coefficient
k d
1/d
0.05 (WEF and ASCE 1998)
Hydraulic
retention time
HRT
day
0.46 ~ 0.75 a1 0.33 ~ 0.75 a2 0.83 ~ 1.25 a3
BOD removal
rate
η BOD
%
92.0 d
(85 ~ 95) a1
97.1 e
(85 ~ 95) a2
92.3 f
(85 ~ 95) a3
Nitrogen
removal rate
η N
%
86.0 d
(55 ~ 80) a1
78.6 e
(55 ~ 80) a2
57.1 f
(55 ~ 80) a3
Phosphorus
removal rate
η P
%
65.0 d
(60 ~ 80) a1
93.75 e
(50 ~ 75) a2
83.3 f
(50 ~ 75) a3
SS removal rate η SS
%
87.0 d
97.5 e
93.3 f
Sludge
production g
X tre.
kgDS/m 3
0.5 d
1.32 e
0.2 f
Amount of
nitrogen in the
biomass
X N,biomass kgN/kgVSS 0.122 (Hiatt and Grady 2008)
a1 , a2 , and a3 Technical Specifications for AAO (HJ 576–2010), OD (HJ 578–2010), and SBR (HJ
577–2010) Activated Sludge Process (Environment Protection Standards of PRC)
b Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant—1A level
(GB18918–2002) (National Standard of PRC)
c calculated when the upper limit of the standard range was selected, in order to get the maximum
GHG emissions
d, e, and f Environmental Impact Assessment Report of different WWTP pubulished online (websits
were shown in (http://www.xuanhan.gov.cn/show/ 2019) (http://www.screnhe.gov.cn/zwgk/jbxxgk/
gsgg/ 1353), and (http://www.meijiang.gov.cn/Home/NewContent?newid=83115), respectively)
g 60% water content
Z. Liang et al.
Table 18.2 The assumed model parameter used in this study
Parameter
Symbol
Unit
Value uesd
AAO
OD
SBR
Flow rate
Q
m 3 /d
40,000
Effluent b
BOD eff
kgBOD/m 3
0.01
COD eff
kgCOD/m 3
0.05
SS eff
kgSS/m 3
0.01
N eff
kgN/m 3
0.015
P eff
kgP/m 3
0.0005
MLSS
–
kg/m 3
2.0 ~ 4.5 a1
2.0 ~ 4.5 a2
2.5 ~ 4.5 a3
MLVSS
–
kg/m 3
3.4 c
2.9 c
3.4 c
Ratio of BOD 5
and BOD u
f 1
–
0.68 (Metcalf and Eddy 1991)
Ratio of
MLVSS and
MLSS
f 2
–
0.5 ~ 0.75 a1
0.5 ~ 0.65 a2
0.75 (Fan et al.
2015)
Ratio of MLSS
and SS
f 3
–
0.7 (MEPPRC 2010)
Cell-yield
coefficient
Y
kg VSS/kg
BOD
0.68 (WEF and ASCE 1998)
Endogenous
decay
coefficient
k d
1/d
0.05 (WEF and ASCE 1998)
Hydraulic
retention time
HRT
day
0.46 ~ 0.75 a1 0.33 ~ 0.75 a2 0.83 ~ 1.25 a3
BOD removal
rate
η BOD
%
92.0 d
(85 ~ 95) a1
97.1 e
(85 ~ 95) a2
92.3 f
(85 ~ 95) a3
Nitrogen
removal rate
η N
%
86.0 d
(55 ~ 80) a1
78.6 e
(55 ~ 80) a2
57.1 f
(55 ~ 80) a3
Phosphorus
removal rate
η P
%
65.0 d
(60 ~ 80) a1
93.75 e
(50 ~ 75) a2
83.3 f
(50 ~ 75) a3
SS removal rate η SS
%
87.0 d
97.5 e
93.3 f
Sludge
production g
X tre.
kgDS/m 3
0.5 d
1.32 e
0.2 f
Amount of
nitrogen in the
biomass
X N,biomass kgN/kgVSS 0.122 (Hiatt and Grady 2008)
a1 , a2 , and a3 Technical Specifications for AAO (HJ 576–2010), OD (HJ 578–2010), and SBR (HJ
577–2010) Activated Sludge Process (Environment Protection Standards of PRC)
b Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant—1A level
(GB18918–2002) (National Standard of PRC)
c calculated when the upper limit of the standard range was selected, in order to get the maximum
GHG emissions
d, e, and f Environmental Impact Assessment Report of different WWTP pubulished online (websits
were shown in (http://www.xuanhan.gov.cn/show/ 2019) (http://www.screnhe.gov.cn/zwgk/jbxxgk/
gsgg/ 1353), and (http://www.meijiang.gov.cn/Home/NewContent?newid=83115), respectively)
g 60% water content