30.06.2014
Density based selection of functional
groups of organisms using a hydro-cyclone
• Selection and retention of anammox granules (ESSDE)
• Impact of cyclone operation on settling behavior (s-select)
Methods:
• two cyclone sizes: 20 and 5 m3/h
• two sludge sources: side- and
mainstream
• sampling all 3 cyclone fractions
in triplets
60
Höhe ab Boden (mm)
50
40
30
y = -338.11x + 394.34
20
10
1.00
1.02
1.04
1.06
1.08
1.10
1.12
1.14
Dichte (g/mL)
1
30.06.2014
Impact of cyclone operation on settling behavior
Full-scale experiments at WWTP Glarnerland
Mainstream Cyclone
Operational experience at WWTP Strass
Due to significant variations in wastewater characteristics (skiing
tourism), load and temperature at Strass typically during the winterand spring season the sludge settling behaviour detoriates and
recovers during summer and fall (see seasonal SVI-variation profile
over 10 years‘ period; monthly average values)
SVI B-stage
250
SVI (ml/g)
200
150
100
50
Impact of cyclone operation on settling behavior
NaAl-dosing
Jul-05
Jul-04
Jan-05
Jul-03
Jan-04
Jul-02
Jan-03
Jul-01
Jan-02
Jul-00
Jan-01
Jul-99
Jan-00
Jul-98
Jan-99
Jul-97
Jan-98
Since operation of the mainstream cyclone no SVI-detoriation ocurs
(daily SVI-measurements from the last 3 winter seasons)
year 1 _ SVI
3000
250
2500
200
2000
150
1500
100
1000
50
500
year 2 _ SVI
year 3 _ SVI
200
180
160
140
120
100
80
60
40
20
0
1-Dec
31-Dec
30-Jan
1-Mar
31-Mar
30-Apr
30-May
0
Jan-96
Jul-96
Jan-97
Jul-97
Jan-98
Jul-98
Jan-99
Jul-99
Jan-00
Jul-00
Jan-01
Jul-01
Jan-02
Jul-02
Jan-03
Jul-03
Jan-04
Jul-04
Jan-05
Jul-05
Jan-06
Jul-06
Jan-07
Jul-07
Jan-08
Jul-08
Jan-09
Jul-09
Jan-10
Jul-10
Jan-11
Jul-11
Jan-12
Jul-12
Jan-13
Jul-13
0
SVI (ml/g)
Fe-dosing
metal dosing (L/d)
SVI (mL/g)
SVI B-stage
Jul-96
Impact of cyclone operation on settling behavior
Since 2002 excess aluminate dosing, additional Fe-dosing and surface
wasting has been applied to maintain SVI<150 ml/g. After
installation of the cyclones settling properties improved and countermeasures have been cut back (now metal dosing set to zero and
predominantly wasting from the WAS-stream).
300
Jan-97
Jan-96
0
Impact of cyclone operation on settling behavior
H(feed)
Impact of cyclone operation on settling behavior
H(OF)
H(UF)
H(feed)
1000
800
700
600
500
400
300
200
100
0
0
5
10
15
time (min)
20
25
30
specific sludge volume (ml/gTSS)
900
sludge volume (ml)
Mainstream: Parallel settling tests have
been conducted on 3 sludge samples –
mixed liquor, cyclone overflow and –
underflow (diluted towards MLSSconcentration) and results have been
standardized to measured TSS
H(OF)
H(UF)
500
450
400
350
300
250
200
150
100
50
0
0
5
10
15
20
25
30
time (min)
feed
Settling colums after ca. 3 min
dV
SVI5/SVI30
SVI5-SVI30
(SVI5-SVI30)/SVI30
OF
-45
2.16
100
1.16
UF
-6
1.64
96
0.64
-88
1.86
42
0.86
mL/g/min
mL/g
-
2
30.06.2014
Impact of cyclone operation on settling behavior
H(feed)
Impact of cyclone operation on settling behavior
H(OF)
H(UF)
H(feed)
1200
H(OF)
H(UF)
900
1000
800
800
600
700
400
200
0
0
5
10
15
time (min)
20
25
30
sludge volume (ml)
sludge volume (ml)
Sidestream: Parallel settling tests have
been conducted on 3 sludge samples –
mixed liquor, cyclone overflow and –
underflow (diluted towards MLSSconcentration) and results have been
standardized to measured TSS
600
500
400
300
200
100
0
0
5
10
15
20
25
30
time (min)
feed
Settling colums after ca. 5 min
dV
SVI5/SVI30
SVI5-SVI30
(SVI5-SVI30)/SVI30
OF
1.30
32
0.30
UF
-74
1.00
0
0.00
mL/g/min
mL/g
-
Operational experience at WWTP Glarnerland
3