1-6. Įn a biological waste treatment system, solids may enter (b) Solids decay in the reactor at a rate equal to kaX, in the influent, be created or destroyed by biological equal to VL/QL) necessary to reduce the concen- amount of time that water resides in the reactor, where ka is the decay rate constant. Write a mass growth or decay, and may leave in the effluent. Con- tration of substrate to 3 mg DOC/L in a complete balance on VSS and compute the value of kd. sider a waste treatment plant treating 1 m3/s of influent containing 55 mg/L of degradable organic solids. The wastewater also contains 180 mg/L of die solved organic carbon (DOC), which For every gram of dissolved organic matter that is degraded, the overall reaction converts a portion of the material into CO2 and H2O, and another portion into 0.4 g of new biomass. Analytically, this biomass and the degradable solids in the influent are both quantified as volatile suspended solids (VSS); that is, the degradable solids in the influent and the new biomass that grows in the reactor are indistinguishable from one another. may be degraded. (a) In a particular system, the dissolved organic matter (i.e., the substrate, S) is removed from solution at an overall rate (including both the conversion into CO2 and into Is = -k,S-X/(S² + K,), where X is the VSS con- centration in the reactor. The values of k1, K, and X in the reactor of interest are &8 mg DOC/mg VS d, 110 (mg DOC/L)², and 120 mg VSS/L, respec- tively. Write a mass balance and compute ue hydraulic detention time, t (i.e., the average new cells) given by mix reactor operating at steady state.
1-6. Įn a biological waste treatment system, solids may enter (b) Solids decay in the reactor at a rate equal to kaX, in the influent, be created or destroyed by biological equal to VL/QL) necessary to reduce the concen- amount of time that water resides in the reactor, where ka is the decay rate constant. Write a mass growth or decay, and may leave in the effluent. Con- tration of substrate to 3 mg DOC/L in a complete balance on VSS and compute the value of kd. sider a waste treatment plant treating 1 m3/s of influent containing 55 mg/L of degradable organic solids. The wastewater also contains 180 mg/L of die solved organic carbon (DOC), which For every gram of dissolved organic matter that is degraded, the overall reaction converts a portion of the material into CO2 and H2O, and another portion into 0.4 g of new biomass. Analytically, this biomass and the degradable solids in the influent are both quantified as volatile suspended solids (VSS); that is, the degradable solids in the influent and the new biomass that grows in the reactor are indistinguishable from one another. may be degraded. (a) In a particular system, the dissolved organic matter (i.e., the substrate, S) is removed from solution at an overall rate (including both the conversion into CO2 and into Is = -k,S-X/(S² + K,), where X is the VSS con- centration in the reactor. The values of k1, K, and X in the reactor of interest are &8 mg DOC/mg VS d, 110 (mg DOC/L)², and 120 mg VSS/L, respec- tively. Write a mass balance and compute ue hydraulic detention time, t (i.e., the average new cells) given by mix reactor operating at steady state.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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1-6. In a biological waste treatment system, solids may enter
(b) Solids decay in the reactor at a rate equal to kaX,
in the influent, be created or destroyed by biological
inorganic carbon (TIC), and
state concentrations of these species.
tration of substrate to 3 mg DOC/L in a complete
where ka is the decay rate constant. Write a mass
equal to VL/QL) necessary to reduce the concen-
balance on VSS and compute the value of kå.
(b) How much biomass is created per liter of influent?
compute the
steady-
growth or decay, and may leave in the effluent. Con-
ncentrating
low solids
much less
sider a waste treatment plant treating 1 m³/s of o
influent containing 55 mg/L of degradable organic
solids. The wastewater also contains 180 mg/L of die
solved organic carbon (DOC), which
For every gram of dissolved organic matter that is
degraded, the overall reaction converts a portion of
the material into CO2 and H2O, and another portion into
0.4 g of new biomass. Analytically, this biomass and the
degradable solids in the influent are both quantified as
volatile suspended solids (VSS); that is, the degradable
solids in the influent and the new biomass that grows in
the reactor are indistinguishable from one another.
an Cin. A
nt plant is
1 has an
ed solids,
may
be degraded.
da waste
e that no
reactor.
nat is the
che waste
2.
5x 10°-L
охудen
L. In the
п propor-
use it ata
(a) In a particular system, the dissolved organic matter
(i.e., the substrate, S) is removed from solution at
an overall rate (including both the conversion
into CO2 and into
ha
ра
ar
new cells) given by
cen is dis-
degree of
* - DO),
1. Write
ef
= -k¡S³X/(S² + K3), where X is the VSS con-
centration in the reactor. The values of k1, K, and X
in the reactor of interest are 8 mg DOC/mg VSS d,
110 (mg DOC/L)², and 120 mg VSS/L, respec-
tively. Write a mass balance and compute the
hydraulic detention time, t (i.e., the average
amount of time that water resides in the reactor,
r's
flo
mi
ins
find the
alr
co
tw
am water
16 mg/L
cha
at a rate
are
tant than
asporting
nd, 75%
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