Continuous Sand Filters - Tertiary WWT and Other Applications

Continuous Sand Filters
Tertiary WWT and other applications
References from Saudi Arabia- Sewage Treatment Plants
Customer:
Flow:
•Abqaiq STP
•Dhahran WWTP
•Hofuf STP Ph1
•Dammam STP
•Hofuf STP Ph2
•Al Khobar STP
•Qatif STP
960 m3/h
1056 m3/h
3000 m3/h
6800 m3/h
1700 m3/h
6800 m3/h
6300 m3/h
SAWEA-Workshop
2004-03-22
Mattias Feldthusen
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Dammam 2004-03-22
Introduction:
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What does ”Continuous Sand filtration”
mean?
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Doesn´t the filter need to be backwashed?
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How could good filtration results be
achieved for applications like Tertiary
Filtration with Continuous Sand Filtration?
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Dammam 2004-03-22
Continuous filtration with
DynaSand
Inlet water
Reject/
washwater
Filtrate
Outlet water
Sandwasher
Air-lift pump
Water distributor
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Drain
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Water upward, sand
downward according to
the counter-current
principle.
Continuous flow of reject
washwater.
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Dammam 2004-03-22
Continuous filtration with
DynaSand
Free standing units in Stainless Steel
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Sizes from 0,3 – 5,0 m2
Water flow from 1,5m3/hour and
upwards
Surface load rates 5 – 25
m/hour
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Dammam 2004-03-22
Continuous filtration with
DynaSand
Free standing units in Glasfibre Reinforced Plastic (GRP)
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Sizes from 0,7 – 4,5 m2
Water flow from 3,5m3/hour and
upwards
Suface load rates 5 – 25 m/hour
For high salinity and corrosive
waters
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Dammam 2004-03-22
Continuous filtration with
DynaSand
Multimodule installations in concrete basins
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BE TeknikINFO AB
Sizes: 5 and 6 m2 /each unit
4 to 12 units in each basin
Water flow from 25 m3/hour and
upwards
Surface load 5 – 25 m/h
Stainless steel or GRP
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Dammam 2004-03-22
Continuous filtration with
DynaSand
Systems
To treat as high flows as needed.
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Dammam 2004-03-22
Continuous Sand filter
advantages
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A revolutionary separation method in form of ”Continuous Contact
Filtration”.
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Simple function without any moving parts. Only air is added to the air-lift
pump.
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The DynaSand Filter has a very high reliability and a very low demand of
maintenance and supervision.
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A compact installation
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No interruption for back-washing.
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Higher capacity per unit of filter area.
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Continuous flow of washwater. No shock-load on the wash water treatment
system.
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No ”first filtrate”. Always high quality filter effluent.
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Dammam 2004-03-22
Continuous filtration with
DynaSand
Nitrification-/Denitrification
Sand Washer
Feed
DynaSand Deni
Filtrate
Sand Washer
Feed
DynaSand Oxy
Filtrate
Wash Water
Wash Water
Air Lift Pump
Air Lift Pump
Nitrification Zone
Air
Feed Distributor
Aerator
Filtration Zone
Feed Distributor
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Dammam 2004-03-22
Continuous Sand filter history
The first pilot trial on Tertiary
filtration of municipal waste
water was carried out in
August 1978.
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Dammam 2004-03-22
DynaSand-the first Continuous filter
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Developed by The Axel Johnson Institute now Nordic Water Products
AB in Nynäshamn, Sweden.
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The DynaSand Filter was introduced in 1979.
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The inventor is still with the company.
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The first filter was installed for metal finishing wastewater in 1979.
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The first municipal wastewater treatment plant with DynaSand also
was erected in 1979.
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Dammam 2004-03-22
DynaSand-the first Continuous Sand Filter
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Today there are over more then 18 000 installed filters worldwide,
among them around 1000 in Sweden.
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DynaSand are installed in more then 50 contries.
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The worlds biggest Continuous Sand Filter installation is to be built in
Saudi-Arabia.
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Dammam 2004-03-22
Continuous Sand filter
Applications
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Municipal drinking water
Municipal wastewater
Pulp and paper industry
Iron & Steel industry
Chemical industry
Food industry
Pharmaceutical industry
Mining- and minerals industry
Power and thermal power stations
Metal finishing industry
And several others….
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Dammam 2004-03-22
Tertiary Filtration
Mechanical filtration
Pre-
Screen / Bar
Aeration
sedimentation
sedimentation
Decanter
Secondary-
Final/Tertiary
Filtration
Thickener
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Dammam 2004-03-22
Tertiary Filtration
Mechanical filtration
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Dammam 2004-03-22
Tertiary Filtration
Mechanical filtration
Reduction by mechanical filtration:
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Suspended Solids (SS):
<10 mg/l ( Max 100mg/l SS-inlet)
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Phosphorus:
Particular bound Phosphorus
Surface load rate :
Sand grain size:
Filter bed height:
10-15 m/hour
1,2-2,0 mm
~ 1,5 m
Shock loading up to 400 mg/l SS can be handled.
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Dammam 2004-03-22
Tertiary Filtration
Continuous Contact Filtration
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Dammam 2004-03-22
Tertiary Filtration
Contact filtration
Reduction by Continuous Contact Filtration:
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Suspended Solids:
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Phosphorus:
Surface load rate :
Sand grain Size:
Filter bed height:
< 5 mg/l ( Max 60mg/l SS-inlet)
< 0,3 mg/l
5-10 m/hour
1,2-2,0 mm
~2m
Often much lower dosage of chemicals than conventional precipitation.
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Dammam 2004-03-22
Long term operational experiences from
Continuous Sand Filtration plant:
•Växjö, Sundet Municipal waste water treatment
plant, Sweden
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Dammam 2004-03-22
Växjö, Sundet WWTP, Sweden
Final/Tertiary filtration
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Dimensioned for 80 000 pe and 20 000 pe of them from Industry.
Design flow 1 500 m3/h.
Maximum flow 3 000 m3/h
Filtration area 300 m2.
60 pcs DynaSand DST 50D Concrete version, 6 basins and 10 filters
in each basin.
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Dammam 2004-03-22
Växjö, Sundet WWTP, Sweden
Final-/Tertiary- filtration
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Dammam 2004-03-22
Växjö, Sundet WWTP, Sweden
Final/Tertiary filtration
Primary settling
Biology
Secondary settling
Filters
Outlet requirements / limit values:
• BOD7
• Ptot
10
0,2
mg/l
mg/l
Process guarantees:
• Susp.
<8
mg/l
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Dammam 2004-03-22
Växjö, Sundet WWTP, Sweden
Susp mg/l
Final/Tertiary filtration
Outlet parameters as average value
over each year
Susp mg/l
10,0
5,0
0,0
Outlet parameters as average value over
each year
Ptot mg/l
0,200
0,100
0,000
CODCr mg/l
Tot-P mg/l
1996 1997 1998 1999 2000 2001 2002 2003
Outlet parameters as average value over
each year
COD-Cr mg/l
50,0
0,0
1996 1997 1998 1999 2000 2001 2002 2003
1996 1997 1998 1999 2000 2001 2002 2003
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Dammam 2004-03-22
Växjö, Sundet WWTP, Sweden
Final/Tertiary filtration
100
90
80
70
60
50
40
30
20
10
0
2003
2002
2001
2000
1999
1998
1997
Tot-P
CODCr
Susp
1996
%
Reduction over the filters %
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Dammam 2004-03-22
Växjö, Sundet WWTP, Sweden
Final/Tertiary filtration
SUSPENDED SOLIDS mg/l
Inlet to DynaSand filters / Outlet from the DynaSand filters over the
year 1996 - 2003
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03
20
02
20
01
20
00
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99
19
98
19
97
19
96
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
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Dammam 2004-03-22
Växjö, Sundet WWTP, Sweden
Final-/Tertiary filtration
Ptot mg/l
Inlet to DynaSand filters / Outlet from the DynaSand filters over the
year 1996 - 2003
1,0
0,9
0,8
0,7
0,6
0,5
0,4
0,3
0,2
0,1
20
03
20
02
20
01
20
00
19
99
19
98
19
97
19
96
0,0
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Dammam 2004-03-22
Växjö, Sundet WWTP, Sweden
Final/Tertiary filtration
CODCr mg/l
Inlet to DynaSand filters / Outlet from the DynaSand filters over the
year 1996 - 2003
100
90
80
70
60
50
40
30
20
10
20
03
20
02
20
01
20
00
19
99
19
98
19
97
19
96
0
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Dammam 2004-03-22
What is happening today?
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Saudi Arabia
-The worlds largest continuous filtration plant, -DynaSand, are
under construction installed in filtration of municipal waste water
for irrigation use.
- Three installations in total each with 216 filter units installed in
concrete version.
- Our representative in Saudi Arabia are Metito –Arab Industries Ltd
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Biological filter
-Nitrification/denitrification and BOD-reduction in Germany, Great
Britain and Norway
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Dammam 2004-03-22
Thank you for your attention!
Nordic Water Products AB
Box 1004
Nynäshamn, Sverige
www.nordicwater.se
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Dammam 2004-03-22