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Product Introduction of Decanter Centrifuges for Sludge Thickening and Dewatering
The cost of biosolids storage, transportation, and end-use or disposal can significantly impact the choice of decanter centrifuges to perform thickening or dewatering functions. Generally speaking, sludge thickening before dewatering will reduce the tankage needed for storage by removing water; dewatering works to remove more water producing a drier cake material (source: SHENZHOU - Centrifuge Thickening and Dewatering of Biosolids).
According to Science, Sludge thickening commonly produces sludge solids concentrations in the 3% to 7% range, which results in an 80% volume reduction. Several factors determine whether a sludge thickening system is sufficient in the treatment of biosolids.
These include:
Sludge thickening using a decanter centrifuge before a digestion treatment process will reduce the size of the digester, and can be used before sludge storage and liquid land applications. Depending on the utilization of the sludge product (landfilled, land applied or dried) the drier the product the more cost effective it will be for storage, transportation and disposal.
Mechanical dewatering with a decanter centrifuge can result in a 95% reduction in volume and a concentration of between 15% to 35% dry solids, compared with 80% volume reduction and solids concentration of 3% to 7% with a sludge thickening-only operation. By removing more water and thereby producing a drier cake product, dewatering will offer significant savings in treatment, handling, and disposal costs.
Advantages of dewatering include the following (source: Biosolids Technology Fact Sheet on Centrifuge Thickening and Dewatering):
Process Performance. Municipal sludge and performance expectations are difficult to fully classify due to wide-ranging variations of different processes as well as domestic and industrial contributions to the biomass.
There is a need to:
Sludge definitions. To better quantify performance, limits need to be set and terms better qualified. All sludge types as defined below assume industrial contributions are less than 20% of the final dewatered solids concentration and that conventional wastewater treatment processes are employed. Chemical additives (such as potassium permanganate used in odor control) are assumed not to significantly affect sludge conditioning.
Raw Primary | The feed solids are assumed to come off the bottom of a primary clarifier and therefore have a consistency of 2 - 7% ts. For thickening before anaerobic digestion or tanker hauling, cake at 5 - 10% ts is specified at +95% recovery and is easily obtainable. |
Waste Activated Sludge | Most feed solids vary from 0.4 - 2.0% tss. Sludge thickening without polymer yields a 4 - 6% cake for recovery specs of 85 - 90%. Polymer is required at higher level of recoveries and/or while thickening at 7 - 10%. Dewatering and high solids dewatering typically occurs at 90 - 95% recovery levels. |
Raw Mixed Primary / Secondary Sludge | Various combinations of mixed primary and secondary sludge are usually found at a concentration between 3 - 6% tss. This analysis assumes a 50:50 blend of sludge types. Recovery levels of +95% are typically achieved using polymer for all modes of separation. |
Mixed Anaerobically Digested Sludge | Assuming a 50:50 blend of primary and secondary sludge to the digester, feed solids at 2 - 4% tss typically result in specifications at +95% recovery with polymer. |
Aerobically Digested Sludge | For aerobically digested sludge, feed solids at 1 - 2.5% tss typically result. Polymer is used to effect separations at 90 - 95% recovery. |
Biosolids | Organic matter recycled from sewage especially for us in agriculture as fertilizer. Treated sewage sludge. |
Cake | The dried substance (sludge solids) from a decanter centrifuge operation. |
Centrate | The liquid discharged from a centrifuge after most of the solids have been removed. |
Centrifugal Force | The force (non-real force) that is needed to make things work as you would think in a reference frame that is accelerating. |
Countercurrent Technology | In countercurrent flow, the two flows move in opposite directions. Under high centrifugal force, the heavier solids migrate radially outwards towards the bowl, displacing the lighter liquid to the pool surface at a smaller radius. |
G-force | An outward force acting on a body rotating about an axis. |
Millon Gallons per Day (MGD) | The measurement of water a facility processes each day. |
Sludge | The semi-solid residual material which is left behind from the treatment of wastewater. |
Slurry | A muddy mixture of a liquid and a solid; a watery mixture of insoluble matter. |
STP | Sewage Treatment Plant |
Total Solids (TS) | The combination of total dissolved solids and total suspended solids in a liquid. |
Total Suspended Solids (TSS) | The portion of fine particles, these do not dissolve, that remains suspended in water. |
Variable Frequency Drive (VFD) | Motor controller that drives an electric motor by varying the frequency and voltage of its power supply. The VFD also has the capacity to control ramp-up and ramp-down of the motor during start or stop. |
Waste Activated Sluge (WAS) | The excess quantity of microorganisms that must be removed from the biological wastewater treatment process to keep the ration of biomass and incoming pollutant load in balance. |
Model
|
Diameter(mm)
|
Lenght(mm)
|
Max speed
|
L/D ratio
|
G-force
|
Capacity(m3/h)
|
Main motor power(Kw)
|
Weight(kg)
|
Dimension
(mm)
|
LW250*1000
|
250
|
1000
|
5000
|
4
|
2722
|
0.5-5
|
7.5
|
950
|
2120*1250*680
|
LW300*900
|
300
|
900
|
4200
|
3
|
2964
|
1-6
|
11
|
1160
|
2150*1300*900
|
LW300*1200
|
300
|
1200
|
4000
|
4
|
2784
|
2-6
|
11
|
1350
|
2450*1300*900
|
LW355*1160
|
355
|
1160
|
3600
|
3.3
|
2576
|
2-8
|
15
|
1400
|
2470*1350*830
|
LW355*1460
|
355
|
1460
|
3600
|
4
|
2576
|
2-10
|
15
|
1800
|
2750*1350*830
|
LW400*1200
|
400
|
1200
|
3200
|
3
|
2294
|
3-12
|
18.5
|
1800
|
2730*1600*1080
|
LW400*1600
|
400
|
1600
|
3000
|
4
|
2016
|
3-15
|
22
|
2000
|
3130*1600*1080
|
LW450*1800
|
450
|
1800
|
2800
|
4
|
1976
|
4-25
|
37
|
2500
|
3320*1700*1130
|
LW500*2000
|
500
|
2000
|
2800
|
4
|
1750
|
5-35
|
45
|
4000
|
3520*1800*1170
|
LW530*1855
|
530
|
1855
|
2600
|
3.5
|
2006
|
5-38
|
55
|
4680
|
3885*1350*1600
|
LW530*2120
|
530
|
2120
|
2400
|
4
|
1709
|
5-40
|
55
|
4800
|
4150*1350*1600
|
LW550*2000
|
550
|
2000
|
2800
|
4
|
2414
|
6-40
|
55
|
5700
|
4570*1380*1600
|
LW650*1950
|
650
|
1950
|
2200
|
3
|
1761
|
6-45
|
75
|
5000
|
4840*1510*1720
|
LW650*2600
|
650
|
2600
|
2000
|
4
|
1456
|
6-65
|
90
|
6000
|
5490*1510*1720
|
LW720*2160
|
720
|
2160
|
2000
|
3
|
1612
|
7-80
|
120
|
6000
|
5200*1600*1800
|
LW720*2880
|
720
|
2880
|
2000
|
4
|
1306
|
7-90
|
120
|
8000
|
3100*1600*1800
|
LW800*2400
|
800
|
2400
|
1800
|
3
|
1451
|
20-100
|
150
|
12000
|
5820*2000*1300
|
LW800*3200
|
800
|
3200
|
1800
|
4
|
1451
|
20-120
|
150
|
1300
|
7100*2000*1300
|