• Share
  • Email
  • Embed
  • Like
  • Save
  • Private Content
03 En Actiflo Softening
 

03 En Actiflo Softening

on

  • 3,380 views

 

Statistics

Views

Total Views
3,380
Views on SlideShare
3,372
Embed Views
8

Actions

Likes
1
Downloads
54
Comments
0

1 Embed 8

http://www.slideshare.net 8

Accessibility

Categories

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

    03 En Actiflo Softening 03 En Actiflo Softening Presentation Transcript

    • Actiflo™ Softening for industrial water & drinking water applications Isabelle Lemaître - Philippe Sauvignet Technical Department
    • Actiflo ® Softening - Agenda
      • Principles
      • Technology description
      • Actiflo® Softening Strengths
      • Industrial and Municipal potential applications
      • History of development program
      • Design Tools
      • On going and further development program
      • Results of Actiflo® Softening EdF Cattenom Nuclear Power plant
    • Actiflo® Softening : Process Principle
      • Chemical precipitation of :
        • hardness,
        • alkalinity,
        • silica
        • and other constituents (e.g., heavy metals)
      • from water and wastewater by the addition of :
        • lime / soda,
        • carbonate ion,
        • metallic salts
        • and polymer,
      • in an Actiflo® including a reaction tank.
    • Actiflo® Softening : Process Principle Main chemical reactions involved
      • Lime (& soda ash) softening
        • CO 2 neutralisation and precipitation
        • Precipitation of temporary and permanent Ca Hardness
        • Precipitation of temporary and permanent Mg Hardness
      • Coagulation with FeCl3
    • Actiflo® Softening – Technology combines within a single treatment line
      • a Dynamic Mixing stage for chemicals injection
      • an Enhanced Precipitation reactor with TURBOMIX™
      • an Accelerated Flocculation stage with TURBOMIX ™
      • a Lamella settling unit
      • a Sludge recirculation system that allows the re-injection of sludge
      Coagulation Maturation Contact CAP Filtration Raw water Coagulation Maturation (Floculation) Clarification 60 m/h Softening reactor Carbonates & Sand recirculation Hydrocyclone Scraper Carbonates return Towards sludge treatment FeCl3 Lime Microsand
      • Main advantage: Compactness
      • Actiflo ® Softening challenges competitors: Densadeg softener 20 – 30 m/h
      Actiflo ® Softening - Strengths Conventional precipitation softening : 2-6m/h Multiflo™ Softener: 20-30m/h Actiflo ® Softener : 60-80m/h
    • Actiflo® Softening Industrial and municipal potential applications
      • Membrane pretreatment for reduction of potential scaling
      • Plant Water and Cooling Tower Make-up Water Production
      • Cooling Tower Sidestream recycling and blow-down reuse
      • Oil & Gas Produced Water Recycling
      • SAGD water treatment for reuse
      • Phosphorus removal
      • Flue Gas Desulfurization Wastewater Treatment
      • Acid Mine Drainage Treatment
      • Wastewater Reuse ( Steel & metals industry, secondary WW…)
      • Drinking water production
      • Dec. 2004 : Patent about TURBOMIX reactor
      • July 2005 : Patent about ACTIFLO Softening
      • 2005-2006 : VWS first references with MultifloTM softening
        • Iscor Newcastle (river water) and Sasol Landlord (cooling water reuse)
        • Clarification velocity < 10 m/h, conventional reaction tank (no TURBOMIX)
      • 2006 : Request from VWS Bus’ to Tech. Dept. of an industrial development program
      Actiflo ® Softening History of d evelopment program
    • Actiflo ® Softening History of d evelopment program
      • 2007 – 2009 : Development Program:
        • Lab Tests about Actiflo and Multiflo softening
        • D&B of 2 mobile Multiflo/Actiflo Softening pilot plants
        • Pilot Studies:
        • Coca Cola, Acapulco  1st Actiflo® Softening industrial scale reference in May 09
          • Well water
          • Flow-rate: 110 m3/h – Reaction tank RT: 30 min. – upflow velocity: 37 m/h
          • Solids recycle ratio 10-20:1
          • Alkalinity: 190  54 ppm as CaCO3 – Turbidity 2 NTU
        • Coffeyville, Ks – CVR Energy refinery – February 2009
        • EDF Cattenom Nuclear Power Plant
    • Actiflo ® Softening – Design Tools
      • Actiflo ® Softening mass balance calculation
      • Optimised performances with :
      • Continuous recirculation Carbonates
      • Ajustable return/extraction rate
    • Actiflo ® Softening – Design Tools
      • PEARL process design Actiflo® Softening module – Under development
        • Precipitation calculations:
          • Based on thermodynamic equilibrium (solubility) with stoechiometric dosages
          • Take Activity coefficients into account to correct the solubility constants
          • Simultaneously solve the different precipitation reactions
          • Alkalinity include OH- + HCO3- + CO32- + NH3 + HPO42- + PO43- + B(OH)4- + S2- + HS- + SO32- (+ theoretically SiO(OH)3-)
          • Partially implement “Ion pairing effect”: ions not 100% dissolved as free ions – tied up as soluble aqueous species
    • Actiflo ® Softening – Design Tools Current limits of PEARL Actiflo® Softening module
      • Softening / precipitation calculations:
        • Assessing the potential for precipitation just on solubility curve is too optimistic,
        • Oversaturation required
        • Kinetics not taken into account
        • Process is never 100% efficient
        •  Enter a “ process efficiency ” according to experience (from pilot trials)
        •  Dosage used for precipitation = total dosage x process efficiency
        • Remaining dosage used to raise pH
    • Actiflo ® Softening – Design Tools Current limits of PEARL Actiflo® Softening module
      • No relationship between upflow velocity and outlet TSS
      •  pilot trials, operation feedback
      • Makes not prediction of metal hydroxide precipitation
      • High rate softening Process Note , including Actiflo® Softening and Multiflo ® softening - Under development
        • First revision to be issued end of 2009
    • Actiflo® Softening On going and further development program
      • EDF pilot trials on Moselle river water and on cooling water
      • Multiflo® Softening and Actiflo® Softening in parallel on the same river water quality, in cold temperature conditions
      • Complementary laboratory tests
      • Ultimate target : Modeling chemical softening processes in order to be able to preliminary design Actiflo® Softening (and Multiflo® Softening) units without prior Jar-Tests or pilot trials, for all kind of water.
    • Actiflo ® Softening pilot Trials EdF Cattenom Nuclear Power plant
    • Pilot Plant location & purpose
      • EdF (Cattenom Site) : Nuclear Power plant (4 x 1300 MW)
      • Purpose : Feedwater to cooling tower treatment
      • Source : River Moselle
        • Turbidity : 5 to 100 Ntu (typically 15 Ntu)
        • Organic Matter : 3.5 to 5 mg/l DOC (SUVA < 3)
        • Alkalinity / TAC :15 to 17°F (150 – 170 mg/l as CaCO 3 )
    • Power Plant General Process flow diagram Cooling tower Nuclear Reactor Industrial water production Boiler feed water production Condensate polishing To WWTP To WWTP To WWTP Actiflo® Softening on : Surface water = River Moselle Actiflo® Softening on : Cooling water circuit = 1.6 x river Moselle Purge return to river
    • Actiflo ® Softening operational setting
      • Lime softening (Solution @ 100g/l); Dose : 120 – 130 ppm
        • Calculation based on 8 x Δ Alk = 8 x 15°F = 120 ppm
        • Target Alkalinity < 30 mg/l as CaCO 3
      • Coagulation (FeCl3 41%) : 20 – 30 ppm
      • Polymer A-PAM (AN934 SNF) : 0.4 ppm
      • µsand (drinking water – GA39) Effective size : 80 µm UC = 1.4
      • µsand concentration = 5 kg/m 3
      • Feedflow : 65 m 3 /h (60 m/h rise rate)
      • Recirculation rate (cyclone overflow) : 8.5 m 3 /h
      • Contact time softening : 10 mn (flow 65 + 8.5 = 73.5 m 3 /h)
      • Sludge discharge flow : 0.3 – 0.5 m3/h ( < 0.8% water loss)
      • Softening Turbomix reactor
        • Contact time : 10 min @ 60 m/h
        • TSS concentration : 3.5 to 4.5 g/l
        • Solids ratio recirculated / formed : 20/1
      • Lime addition into a specific tank (mixed with sludge)
      • Sludge extraction by overflow discharge
      Actiflo ® Softening operational setting
    • Initial results (Clarified water & sludge)
      • Clarified water quality at 60 m/h:-
        • TSS < 5 mg/l (Turbidity < 1 Ntu)
        • Alkalinity (CAE) < 30 ppm pH 8.5
        • Δ THT : 100 - 120 mg/l as CaCO3
        • 40% DOC removal!
      MA cyclone underflow MA cyclone overflow
      • Carbonate sludge:
        • Concentration : 30 to 60 g/l
        • No build-up of carbonate around µsand
        • Good separation sand/sludge
    • Current and future test work
      • On river Moselle
        • Run without coagulant (only with a small acid dose)
        • Compare coagulant dosing point upstream & downstream softening tank
        • Reduce solids ratio (purge more = lower sludge concentration )
      • On cooling tower water (1.6 x river Moselle)
        • Run at 80 m/h
        • Reduce contact time (softening down to 8 mn)
        • Experience higher solids (Turbidity load) up to 30 – 40 Ntu
        • Experience higher Alkalinity
        • Experience higher DOC (Organic Matter)
        • Study legionnella removal
    • Conclusions
      • Very promissing early results
        • More pilot trials needed to validate design enveloppe
      • Excellent rise rate capability (60 m/h may be more)
      • Interesting organic removal capabilities (to be studied more)
      • High sludge concentration (30 – 60 g/l) extremely good thickening capability
      • Wide range of application both industrial and Municipal
      • Should sell like hot cakes…
      • Thank You!