Environmental Engineering Reference
In-Depth Information
Table 5.5 Components in liquid phase
Soluble
Particulate
S
liq,1
Monosaccharides (S
su
)
S
liq,2
Amino acids (S
aa
)
S
liq,3
Long-chain fatty acids (S
fa
)
S
liq,4
Total valerate (S
va
)
S
liq,5
Total butyrate (S
bu
)
S
liq,6
Total propionate (S
pro
)
S
liq,7
Total acetate (S
ac
)
S
liq,8
Hydrogen (S
h2
)
S
liq,9
Methane (S
ch4
)
S
liq,10
Inorganic carbon (S
IC
)
S
liq,11
Inorganic nitrogen (S
IN
)
S
liq,12
Soluble inerts (S
I
)
X
liq,13
Composites (X
c
)
X
liq,14
Carbohydrates (X
ch
)
X
liq,15
Proteins (X
pr
)
X
liq,16
Lipids (X
li
)
X
liq,17
Sugar degraders (X
su
)
X
liq,18
Amino acid degraders (X
aa
)
X
liq,19
Long-chain fatty acid degraders (X
fa
)
X
liq,20
Valerate and butyrate degraders (X
c4
)
X
liq,21
Propionate degraders (X
pro
)
X
liq,22
Acetate degraders (X
ac
)
X
liq,23
Hydrogen degraders (X
h2
)
X
liq,24
Particulate inerts (X
I
)
Source: Adapted from Batstone et al. (2002).
Table 5.6 Processes in liquid phase
j = 1 Disintegration
j = 2 Hydrolysis of carbohydrates
j = 3 Hydrolysis of proteins
j = 4 Hydrolysis of lipids
j = 5 Uptake of sugars
j = 6 Uptake of amino acids
j = 7 Uptake of LCFA
j = 8 Uptake of valerate
j = 9 Uptake of butyrate
j = 10 Uptake of propionate
j = 11 Uptake of acetate
j = 12 Uptake of hydrogen
j = 13 Decay of sugar degraders
j = 14 Decay of amino acid degraders
j = 15 Decay of LCFA degraders
j = 16 Decay of valerate and butyrate degraders
j = 17 Decay of propionate degraders
j = 18 Decay of acetate degraders
j = 19 Decay of hydrogen degraders
Source: Adapted from Batstone et al. (2002).
equations 5.5 and 5.6 (Batstone et al., 2002). In some cases, the average
residence time of particulate components in the digester is longer than
hydraulic retention time (HRT) due to inhomogeneous mixing. It is thus
useful to include the term t
res,X
into the equation as shown for particulate
components.
X
j
¼
1-19
r
j
n
i
;
j
;
dS
liq
þ
q
liq
V
liq
i
dt
¼
;
S
in
;
i
S
liq
;
i
i
¼
1-12
½
5
:
5
X
j
¼
1-19
r
j
n
i
;
j
;
dX
liq
;
i
dt
¼
q
liq
X
in
;
i
V
liq
X
liq
;
i
t
resX
þ
q
liq
þ
i
¼
13-24
½
5
:
6
V
liq
=
where S
in,i
and S
liq,i
are inflow and outflow concentration of soluble
component i; X
in,i
and X
liq,i
are inflow and outflow concentration of
particulate component i; q
liq
is volumetric flow rate assuming q
in
=q
out
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