09/16 - Decanter centrifuges, centrifugal extractors Pieralisi · Electrical and control panel “Pieralisi Control System” is divided in two main sections: power and control. In

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ENVIRONMENTAL APPLICATIONS

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D E D I C A T E D I N N O V A T O R S

D E D I C A T E D I N N O V A T O R S

Via Don Battistoni, 1 - 60035 Jesi (AN) ItalyPhone +39 0731.2311- Fax +39 0731.231239www.pieralisi.com - [email protected]

Environmental Applications

1 .2 .3 . 4 . 5 . 6 . 7 . 8 . 9 .

10 .

Municipal wasteBio wasteBreweries waste waterFruit juice waste waterWineries waste waterWater purifyingPharmaceutical waste waterTannery waste waterSugarbeet processing waste waterTomato processing waste water

The indiscriminate use of the resources on Earth threatens the existence of life on the planet. Recovering these resources is the world’s future challenge for making human life on Earth sustainable. Especially for those resources that are not renewable, such as water, Pieralisi Group offers a longtime experience and a strong expertise to guarantee an important contribution to this mission.

We are a global presence with 16.000 installed plants. Since 1970, we design and develop solutions for sludge thickening and dewatering, basing on our large range of continuously innovated decanters and separators. Pieralisi centrifuges allow to recover industrial and process fluids by removing solid and liquid contaminants with significant environmental and economic advantages.

1Municipal Waste

2Bio Waste

Example of Process Flow DiagramProcess section involving Pieralisi technologies Example of Process Flow DiagramProcess section involving Pieralisi technologies

Raw Product

Sorting

Oil Removal

SolidSolid

Clarified Water

DewateringPag 12

Anaerobic Fermentation

BioreactorGasometer Electrical

Power Unit

Liquor

Screw Press

Composting

WWTP

Solid Removal

Oil Removal

Clariflocculation

Filtration

Disinfection

DenitrificationThickening

Equalization

Pre-aeration

Solids Disposal

Surface Water

Solid Disposal

Biogas

PrimarySedimentation

Oxidation Nitrification

AnaerobicDigestion

AerobicStabilization

SecondarySettlement

DewateringPag 12

ThickeningPag 10

Slud

ge A

naer

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Trea

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Wat

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Slud

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Waste Effluent

ThickeningPag 10

DewateringPag 12

Clarified WaterClarified Water

D E D I C A T E D I N N O V A T O R S D E D I C A T E D I N N O V A T O R SEnvironmental Applications: Processes Environmental Applications: Processes2 3

5WineriesWaste Water

6Water Purifying

3BreweriesWaste Water

4Fruit JuiceWaste Water

Example of Process Flow Diagram


Process section involving Pieralisi technologies






Wet Sludge Disposal

Biogas

Sand filter

Sand Filter

Strainer

Anaerobic Reactor

Anaerobic Cleaning Stage

Waste Water

pH value adjusting

Process WaterWWTP

Production Process

Solids DisposalDewatered Sludge

DewateringPag 12

Water

Clarified Water

Activation Sedimentation

Anaerobic Treatment

NeutralizationPre-treatment

Clarified Water

Strainer

Waste Water

Production Process

Solids Disposal

Clarified Liquid

Dewatered Sludge

DewateringPag 12

Pre-treatment

Clarified Water

Strainer

Waste Water

Production Process

Activation Sedimentation

Solids Disposal

Clarified Liquid

Dewatered Sludge

DewateringPag 12

Sedimentation

Thickening

Multi-stageFiltration

Filtered Wateras Drinking Water

Chemical Treatment

Waste Water

Production Process


DewateringPag 12

Water

Clarified Water


9SugarbeetProcessingWaste Water

10TomatoProcessingWaste Water

7PharmaceuticalWaste Water

8TanneryWaste Water









Clarified Water

HomogenizationTank

Clean Water

Clean Water Make Up

Clarifier

Waste Water

Production Process


DewateringPag 12

Clarified Water

Clean Water

Solid Removal

Settling

Thickening

Biological Oxidation

Sludge

Clean Water Make Up


DewateringPag 12

Waste Water

Production Process

Polymer Solution

BiologicalTreatment

Waste Water

Production Process

DewateringPag 12

Solids Disposal

Waste Water

NeutralizationPre-treatment

Activation Sedimentation Sludge

Rake / Defatting

Waste Water

Production Process

Solids Disposal

Clarified Liquid

Dewatered Sludge

Anaerobic Treatment

DewateringPag 12

Clarified Water


Environmental Applications: ThickeningEnvironmental Applications: Thickening

4. Flushing Valve

A complete line of a solid-liquid thickening plant consists of the following equipment:

Sludge feeding pump (mono pump)Preparation unit for polymer solution (for liquid or powder active ingredients)Liquid polymer dosing pump Polymer solution feeding pump Sludge flow meterPolymer solution flow meterFlushing valvesMain control panelDecanter centrifugePump for thickened sludge

122a2b3a3b4567

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Thickening:volume reduction and solid concentration increase

Decanters are used for dynamic thickening in order to increase the solid concentration in the liquid up to 6-8% dry solid. Thickened sludge is usually sent to the following dewatering step.

The Thickening Solution

Sludge

Flushing Water

Water

Powder Polymer

Liquid Polymer

Water

4. Flushing Valve

Mixing and Activation Tank

Dosing Tank

1. Pump

2b. Pump2a. Dosing Pump

Drain

Tank

Flushing Water

5. Control Panel

2. Polymer Unit

TYPICAL VALUES

0,5÷2% DS

7. PumpTYPICAL VALUES

6 ÷ 8 % DS

100

80

60

40

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0,5÷2% DS

IN

OUT

6÷8% DS

Thickening Process

Thickened Sludge

Clarified Water

3a. Flow Meter

3b. Flow Meter

Mixer

6. Decanter Centrifuge

D E D I C A T E D I N N O V A T O R S D E D I C A T E D I N N O V A T O R S10 11

4. Flushing Valve

4. Flushing Valve

Mixing and Activation Tank

Dosing Tank

1. Pump

2b. Pump2a. Dosing Pump

Tank

3a. Flow Meter

3b. Flow Meter

Mixer

6. Decanter Centrifuge

Environmental Applications: DewateringEnvironmental Applications: Dewatering

100

80

60

40

20

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1÷5% DS

IN

OUT

20÷35% DS

Dewatering Process

Drain

7. Screw Conveyor

The Dewatering Solution

Drain

Flushing Water

2. Polymer Unit

TYPICAL VALUES

1÷5% DS

TYPICAL VALUES

25 ÷ 30 % DS

Solid Cake

Clarified Water

A complete line of a solid-liquid dewatering plant consists of the following equipment:

Sludge feeding pump (mono pump)Preparation unit for polymer solution (for liquid or powder active ingredients)Liquid polymer dosing pump Polymer solution feeding pump Sludge flow meterPolymer solution flow meterFlushing valvesMain control panelDecanter centrifugeScrew conveyor for solid cake trasportation

122a2b3a3b4567

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Dewatering:volume reduction and solid concentration increase

Decanters are used for dynamic solid-liquid separation and dewatering; the inlet solid concentration increases up to 20-35% dry solid, depending on the sludge stabilization efficiency obtained in the previous treatment steps.

Sludge

Flushing Water

Water

Powder Polymer

Liquid Polymer

Water

5. Control Panel

D E D I C A T E D I N N O V A T O R S D E D I C A T E D I N N O V A T O R S12 13

Electrical and control panel

“Pieralisi Control System” is divided in two main sections: power and control. In the power unit are placed all the main switches and the variable frequency drivers (VFD) for both decanter and auxiliaries. The control module is based on a PLC and HMI with touch screen panel. A dedicated software, designed by Pieralisi automation department, is embedded in the PLC to automatically control the whole thickening and dewatering sections in each operating step: start-up, duty, flushing and shut-down. The HMI allows to navigate through several areas:• separation process monitoring• operating parameters control• alarms detection• trends displayThe last control release optimizes the separation performances and stabilizes the operation conditions by controlling the decanter in “torque mode”. The logic is continuously measuring the torque on the decanter scroll, keeping it stable at its set point value, by smoothly acting on the scroll differential speed.All Pieralisi control panels can be equipped with a dedicated module for remote connections and assistance.

Decanter Centrifuge

High efficiency separation unit capable to handle liquid mixture containing a considerable amount of solid particles. Decanter performances are related not only to process operating parameters but also to the mixture composition, density and viscosity of the different phases, solid density and particles size. The internal centrifugal force is the result of the rotational speed coupled with the large bowl diameter. The decanter is driven by a main motor connected to the horizontal shaft of the bowl. The product enters through the feed pipe into the centre of the bowl where it is accelerated generating the solid-liquid separation.The clarified liquid phase is discharged from the rotating bowl by means of special devices on one side of the bowl.The dewatered solid, collected on the bowl internal walls, is transported by the scroll and continuously discharged on the opposite side.Several options are available to configure the decanter accordingly to the requirements of each specific process. Solid scraper (a) and gate valve (b) are the most commonly used in environmental applications.

Preparation unit for polymer solution

Several additives are largely considered to increase the performance of thickening and dewatering plants. Polyelectrolyte is the type of additive most commonly used for environmental applications.Pieralisi polymer preparation unit is specifically designed to be operated both with powder and liquid additives according to the specific requirements of the client. The results is a fully homogenized and activated polymer solution with the concentration suitable for the requested performances. The system is suitable to work on a continuous base and its automatic control can be demanded to a dedicated local panel or integrated in the main control panel.

Screw Conveyor

The solid exiting from the decanter can be discharged by gravity on an underlying container or transported to a side container by means of a screw conveyor. The unique design of Pieralisi decanter allows to install both horizontal and inclined conveyors directly under the solid outlet.The layout of the conveying system is tailored on the specific path required on each site and can be based on a multiple solution with more than one element. In any case the control of each component and the automatic management of the transition sequences is implemented in the main control panel in accordance with the decanter operating status.

Flow Meter

The possibility to measure the flows to the decanter allows a more precise control of the operating parameters assuring cost optimization and more stable performances. Pieralisi installs on its unit only major brands flow meters with proven quality and reliability.

Flushing Valves

The flushing procedure is a key factor for the main components life cycle and long term performance stability. Thus, two specific cleaning sequence are automatically activated by the PLC before the centrifuge shut down or in case of necessity. Dedicated solenoid valves are installed on the circuits to allow the flushing of both the internal part of the rotating assembly and the case volume outside the bowl. The flushing cycle parameters can be adjusted from the HMI in accordance to the requirements of each plants.

Pumps

The centrifugal technology requires a constant inlet flow in order to keep stable separation conditions. For this reason, mono pumps (progressive cavity pumps) are usually installed to properly feed the sludge and the polymer solution to the decanter and eventually to pump the clarified liquid to the storage area. Each pump can be equipped with VFD, constantly monitored and automatically regulated by the main control panel.

Sludge – Polymer Mixer

The proper mixing of the activated polymer solution into the sludge is a key factor for the separation performances. Pieralisi static mixer is designed to blend the flows in a gently and effective way, guaranteeing the full contact of the polymer with the sludge solid particles.

a

b

a

b

D E D I C A T E D I N N O V A T O R S D E D I C A T E D I N N O V A T O R S14 15Environmental Applications: ComponentsEnvironmental Applications: Components

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ROTATING ASSEMBLY

Bowl

Steep coneShallow coneInner surface with linersInner surface with groovesWear protections solid discharge bushes (replaceable)Wear protections inner surface (flame spray)

Scroll

Single flightReduced pitch flightVariable pitch flightFlight with windowsFlight wear protections: sprayed tungsten carbide Flight wear protection: tiles (replaceable)Diffuser wear protections : plates (replaceable)

MATERIALS

BowlSAF 2205 Duplex stainless steelAISI 414 stainless steel

ScrollAISI 304 stainless steelAISI 316 stainless steel

Case

Painted carbon steel case and subframeStainless steel cylindrical bodyStainless steel solid-liquid chambersStainless steel subframe

Parts in contact with the product

Stainless steelTailored on the application and International or European standard

EXECUTION Installation areaSafe area (not hazardous area)Hazardous area: ATEX Zone 1Hazardous area: ATEX Zone 2

LUBRICATIONGearbox Oil bath

Bearings Automatic greasing

PROCESS CONFIGURATION

Liquid outlet

Two phases (1 liquid - 1 solid)Three phases (2 liquids - 1 solid)Interchangeable liquid outlet levelsLiquid discharge level adjustable during operation

DRIVES

Bowl driveElectric motorHydraulic motor

Scroll drive

Fixed differential speed (countershaft)Electric motor (back drive)Hydraulic motorRotovariator

DECANTER OPTIONS

Kits and Systems

Control panelCounter pressure valveCooling fanInertization systemSolids scraper deviceCyclone kitGate valve kitCIP washing system

PLANT OPTIONS

Kits and Systems

Filtering unitAdditive unitSolid conveyor systemHomogenizing systemFeeding pumpFlow rate measurement kitHeating system

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Configuration Table

D E D I C A T E D I N N O V A T O R S16 Environmental Applications: Configuration Table

Documents

09/16 - Decanter centrifuges, centrifugal extractors Pieralisi · Electrical and control panel “Pieralisi Control System” is divided in two main sections: power and control. In