Sludge Thickening and Dewatering Decanter Centrifuge

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Number of Employees
30
Year of Establishment
2018-04-10
  • Sludge Thickening and Dewatering Decanter Centrifuge
  • Sludge Thickening and Dewatering Decanter Centrifuge
  • Sludge Thickening and Dewatering Decanter Centrifuge
  • Sludge Thickening and Dewatering Decanter Centrifuge
  • Sludge Thickening and Dewatering Decanter Centrifuge
  • Sludge Thickening and Dewatering Decanter Centrifuge
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Basic Info.

Model NO.
LW
Type
Centrifuge
Separation Mode
Sedimentation Type
Operating Type
Continuous Type
Installation
Horizontal
Centrifuge Type
Horizontal Spiral Centrifuge
Pressure
Low Pressure
Condition
New
Material
SS304 or SS316 L
Motor
ABB
Touch Screen
Siemens
PLC
Siemens
Transport Package
Wooden Cases
Specification
2065*1050*800
Trademark
Shenzhou
Origin
China
HS Code
8421192000
Production Capacity
500sets

Packaging & Delivery

Package Size
150.00cm * 100.00cm * 120.00cm
Package Gross Weight
1020.000kg

Product Description

Product Introduction of Decanter Centrifuges for Sludge Thickening and Dewatering
 

Sludge Thickening and Dewatering Decanter Centrifuge
Sludge Thickening and Dewatering Decanter Centrifuge
Sludge Thickening and Dewatering Decanter Centrifuge

 

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).

Sludge Thickening and Dewatering Decanter Centrifuge
Sludge Thickening and Dewatering Decanter Centrifuge



Sludge Thickening and Dewatering Decanter Centrifuge

Sludge Thickening

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:

Types of Sludge

  • Waste Activated Sludge (WAS) / Secondary Sludge - (0.8-1.3% TS)
    • Has natural separation of free water (floc) and is easily settable
    • Little to no polymer is required. (*)(**)
* Traditional decanter centrifuges used for sludge thickening can work using little to no polymer but require higher energy consumption or the capacity of the equipment is limited. Other thickening technologies (rotary drum, gravity belt, DAF) need polymer to produce 4-5% solids concentration
 
**The  Sludge Thickener will achieve 4-5% solids concentration using no polymer, with 50% less energy consumption and increased capacity compared to traditional decanter centrifuges.
  • Primary Sludge - (1.5-5% TS)
    • Solids are heavy and settable but laden with colloidal material (hazy)
    • Hard to remove fine particles
    • Polymer is usually required
  • Digested Sludge - (1.5-3% TS)
    • Not easily settable;
    • Polymer is usually required
  • Transportation costs based on tonnages
     
  • Landfill percent of solids concentration requirements
     
  • Whether the sludge can be disposed in a sludge lagoon

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.
 

Sludge Dewatering

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):

  • Reduces volume, saving money on storage and transportation
     
  • Eliminates free liquids before landfill disposal
     
  • Reduces fuel requirements if the residuals are to be incinerated or heat dried
     
  • Eliminates ponding and runoff
     
  • Optimizes air drying and many stabilization processes

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:

  • Define sludge characteristics
     
  • Characterize optimum performance levels expected on the equipment

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.

 

Glossary of Terms Used in this Section

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.
Technical parameter 
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

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