Context:
could
 
cause
 problems
 later
 in
 the
 treatment
 process
.
 
These
 materials
 are
 screen
ed
 out
,
 b
agged
 and
 sent
 to
 
a
 land
fill
.
 2.
 Pump
ing
:
 Many
 
waste
water
 systems
 
rely
 on
 the
 force
 of
 gravit
y
.
 T
rophy
 Club
 has
 ten
 lift
 stations
 (
which
 are
 most
ly
 
located
 on
 the
 east
 side
 of
 town
)
 to
 move
 se
wage
 to
 the
 treatment
 plant
.
 Our
 plant
 is
 
built
 at
 one
 of
 the
 
lower
 points
 in
 T
rophy
 Club
 so
 the
 lift
 stations
 only
 have
 to
 pump
 the
 water
 to
 
where
 the
 ground
 start
s
 drop
ping
 to
 turn
 it
 into
 gravit
y
 flow
.
 The
 wet
 well
 is
 32
’
 deep
 and
 
waste
water
 is
 pump
ed
 from
 there
 to
 the
 
screening
 process
,
 and
 then
 gravit
y
 
takes
 over
 through
out
 the
 plant
 un
less
 the
 different
 
steps
 are
 required
 to
 
recycle
 the
 
waste
water
 back
 to
 the
 head
 of
 the
 facilit
y
.
 3.
 B
iological
 Treatment
:
 A
er
ation
 ba
sins
 provide
 an
 
a
erobic
 environment
 that
 
promote
s
 
bacteria
 to
 metaboliz
e
 organic
 matter
.
 This
 is
 achieve
d
 by
 creat
ing
 an
 environment
 
where
 the
 oxid
ation
 and
 stabiliz
ation
 can
 take
 place
,
 thu
s
 allow
ing
 poll
utant
s
 that
 can
 
negative
ly
 impact
 the
 receiv
ing
 stream
 to
 be
 remove
d
.
 4.
 Sl
udge
 Remov
al
:
 Was
te
water
 is
 then
 pump
ed
 to
 large
 
circular
 tank
s
 
called
 sediment
ation
 tank
s
 or
 clar
ifier
s
.
 Here
,
 the
 sl
udge
 (
the
 organic
 
portion
 of
 the
 se
wage
)
 
settle
s
 out
 of
 the
 
waste
water
 and
 is
 pump
ed
 out
 of
 the
 tank
s
.
 The
 majorit
y
 of
 the
 water
 is
 de
cante
d
 from
 the
 top
 and
 the
 sl
udge
 is
 then
 pump
ed
 to
 and
 
processed
 in
 large
 tank
s
 
called
 
dige
sters
.
 Most
 of
 the
 sl
udge
 is
 sent
 back
 to
 the
 
a
er
ation
 ba
sins
 to
 keep
 
a
 c
ontinuous
 flow
 of
 micro
organism
s
 so
 the
 majorit
y
 of
 in
coming
 organic
 load
 can
 be
 absorb
ed
.
 This
 is
 
called
 Return
 Activ
ated
 Sl
udge
 (
RAS
).
 5.
 S
cum
 Remov
al
:
 As
 sl
udge
 is
 se
ttling
 to
 the
 
bottom
 of
 the
 sediment
ation
 tank
s
,
 
lighter
 materials
 
float
 to
 the
 surface
.
 This
 ‘
s
cum
’
 
includes
 gre
ase
,
 oil
s
,
 plastic
s
,
 and
 
soap
.
 
Very
 little
 
s
cum
 is
 collect
ed
 in
 our
 operation
 but
 
when
 needed
,
 it
 is
 v
acuum
ed
 from
 the
 tank
s
 and
 pump
ed
 to
 the
 
dige
sters
 
along
 with
 the
 sl
udge
.
 6.
 Kill
ing
 
bacteria
:
 Final
ly
,
 the
 
waste
water
 flow
s
 through
 
a
 final
Input:
 1)
 P
RELI
MINA
RY
 T
REAT
MENT
 (
HEAD
WORKS
)
 
Mechanical
 
screening
 remove
s
 large
 de
bris
 and
 rag
s
 from
 raw
 
waste
water
.
 Gri
t
 
removal
 separat
es
 sand
 and
 grave
l
.
 2)
 P
UMP
ING
 Was
te
water
 collection
 systems
 
rely
 on
 the
 force
 of
 gravit
y
 and
 lift
 stations
 to
 move
 se
wage
 through
 the
 plant
.
 Was
te
water
 
often
 has
 to
 be
 pump
ed
 to
 
a
 plant
’
s
 
highest
 process
 elev
ation
 (
Main
 Lift
 Station
).
 3)
 A
ER
ATING
 Deca
ying
 organic
 matter
 
uses
 up
 
oxygen
.
 A
er
ation
 rep
len
ishes
 it
.
 Return
 Activ
ated
 Sl
udge
 is
 pump
ed
 to
 front
 of
Targets:
 the Idx: 287, Δloglikelihood: -0.680
  Idx: 259, Δloglikelihood: 0.141
a Idx: 262, Δloglikelihood: 1.623
erator Idx: 146181, Δloglikelihood: -0.672
s Idx: 263, Δloglikelihood: 0.535
 to Idx: 288, Δloglikelihood: 0.551
 aid Idx: 33856, Δloglikelihood: 1.490
 the Idx: 287, Δloglikelihood: 0.672
 b Idx: 330, Δloglikelihood: 1.582
iological Idx: 121673, Δloglikelihood: 0.013
 process Idx: 5759, Δloglikelihood: 0.647
. Idx: 260, Δloglikelihood: 0.212
 4) Idx: 8352, Δloglikelihood: 0.407
  Idx: 259, Δloglikelihood: -0.097
REMO Idx: 196159, Δloglikelihood: 1.343
VING Idx: 191176, Δloglikelihood: 0.515
  Idx: 259, Δloglikelihood: -0.450
SLU Idx: 125197, Δloglikelihood: 1.735
DGE Idx: 220073, Δloglikelihood: 1.302
 Se Idx: 746, Δloglikelihood: 2.709
diment Idx: 39794, Δloglikelihood: -1.702
ation Idx: 1300, Δloglikelihood: 5.742
 tank Idx: 19331, Δloglikelihood: 5.654
s Idx: 263, Δloglikelihood: 0.068
 allow Idx: 14447, Δloglikelihood: -0.167
 the Idx: 287, Δloglikelihood: 0.268
  Idx: 259, Δloglikelihood: 0.083
heavy Idx: 39852, Δloglikelihood: 2.718
 sl Idx: 11463, Δloglikelihood: -1.533
udge Idx: 127865, Δloglikelihood: -0.001
 to Idx: 288, Δloglikelihood: -0.119
  Idx: 259, Δloglikelihood: 1.406
settle Idx: 136882, Δloglikelihood: 0.914
 to Idx: 288, Δloglikelihood: 1.069
 the Idx: 287, Δloglikelihood: 0.219
  Idx: 259, Δloglikelihood: 0.202
bottom Idx: 3705, Δloglikelihood: 0.012
 and Idx: 305, Δloglikelihood: 0.527
 be Idx: 390, Δloglikelihood: -0.228
 pump Idx: 31293, Δloglikelihood: -1.133
ed Idx: 345, Δloglikelihood: 0.001
 out Idx: 1350, Δloglikelihood: 0.309
. Idx: 260, Δloglikelihood: 0.302
 Dewa Idx: 114794, Δloglikelihood: -1.037
tering Idx: 80713, Δloglikelihood: -0.066
  Idx: 259, Δloglikelihood: -0.216
allows Idx: 36529, Δloglikelihood: 1.482
  Idx: 259, Δloglikelihood: 0.210
thick Idx: 70577, Δloglikelihood: -2.692
ening Idx: 53042, Δloglikelihood: -0.593
 of Idx: 304, Δloglikelihood: -0.379
 the Idx: 287, Δloglikelihood: 0.067
 sl Idx: 11463, Δloglikelihood: 0.167
udge Idx: 127865, Δloglikelihood: 0.002
 prior Idx: 24929, Δloglikelihood: 0.318
 to Idx: 288, Δloglikelihood: -0.001
 processing Idx: 36031, Δloglikelihood: 1.372
 in Idx: 281, Δloglikelihood: 2.046
 large Idx: 8057, Δloglikelihood: 3.661
 dig Idx: 3163, Δloglikelihood: 3.990
ester Idx: 39572, Δloglikelihood: 0.004
 tank Idx: 19331, Δloglikelihood: 1.228
s Idx: 263, Δloglikelihood: 0.021
. Idx: 260, Δloglikelihood: 0.039