Salsnes Filter Overview

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Salsnes Filter Overview

• Salsnes Separation ( S.A.) Pty Ltd
• Devlyn Fraser

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Product Introduction

• The purpose of the Salsnes Filter
• 1) Separation dewatering of solids, leading to
  the reduction of the (TSS) Total Suspended Solids
  in municipal effluent
• 2) Separation dewatering of solids in
  Industrial effluent, with the aim of lowering the
  SS, COD and BOD, effectively lowering effluent
  billing costs, as well as possible reductions in
  operations maintenance costs.

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Technical Overview

• 2 Models, SF 2000 SF 6000
• Manufactured in 304 316 S/Steel
• Hydraulic loading of 70- 575 m³ / Hr
• Endless Cloth Filter, Woven Polyester, 0.1- 1.0
  mm pores (785 Microns Thick)
• 40-70 removal of suspended solids
• The cake (dewatered Sludge) 25-45 Dry substrate
• Weight 375 Kg (SF2000) 725 Kg (SF6000)
• Energy Consumption 2.5 Kw (SF2000) 4.2 Kw
  (SF6000)

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Process Description

• Effluent inflow through inlet tube
• Effluent filtered through an endless Filter Cloth
• Removal of 40-70 of suspended solids
• The filtered water is released through
  outlet-pipe
• Suspended solids are conveyed by filter cloth
  dumped into a sludge compartment
• Excess sludge removed from cloth by an Air knife
• Primary Sludge dewatering is facilitated by
  gravity during transport of the sludge to the
  trough

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Process Description

• Secondary dewatering of sludge is facilitated by
  screw press compacting the sludge in the press
  cylinder
• Excess water is drained via secondary outlet
• Compressed, dewatered sludge (cake) is released
  via a spring loaded lid on the press cylinder
• Excess Fat deposits are removed from cloth twice
  per day via Hot water spray (20 Ltrs Each) -
  Adjustable
• On/Off operating speed is controlled by
  pressure transmitter, measuring the level of
  inflow, to achieve optimal balance between inflow
  the filters filtration properties
• Process is completely automated, incl. Cleaning
  minimal maintenance

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Applications
A) Overview of Expanded process at Municipal
WWTPS
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Applications Cont.

• Salsnes Filter removes SS in parallel to
• PST, possibly allowing
• decommissioning of the digester.
• Sludge cake to be stabilised (composted) sent
  to landfill or other
• Alternately sludge must not be compressed
  dewatered, sent to digester to neutralise
  biological activity.

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Installation Options - WWTP

• Relieve overloaded capacity SF installed prior
  to PST
• SF installed after PST to reduce loading on
  aeration basins
• SF installed parallel with PST, tapping back to
  aeration basins, removing excess flow rates from
  PST
• Reduce wear, maintenance re-furbishment costs
  on pumps, if installed prior to pump to remove
  abrasive materials

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Applications to avoid in WWTP

• Do not install SF after PST on the digester feed
  line, SF not able to deal with digested sludge.
• Do not load SF with sludge treated with
  Flocculants (polymers), possible application for
  very limited flocculant dosing may be acceptable.

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Industrial Applications

• The following are possible applications for SF
• Sugar Mills- Juice filtration
• Tanning Processes
• Paper Mills
• Canneries
• Fish, Poultry food processors and Abattoirs
• Fruit Juice Processing
• Biofuel Processes
• Breweries
• Screening Before Reverse Osmosis Desalinisation
• Animal Feed Manufacturers
• Grain based industries

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Industrial Applications Cont.

• It is imperative that the SF does not be
  considered as a means of removing Grit (Sand)
  from Effluent.
• The SF is able to contend with approximately 10
  Grit in Effluent.
• One must bear in mind that the higher the Grit
  Loading in the Effluent, the higher the wear and
  maintenance costs of the SF will be.

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SF Benefits - Industrial Processes

• Reduced effluent SS, COD, BOD, Efficiently
  Reducing Effluent Billing Costs.
• Recovery of some Protein content in SS for
  Re-processing in the Rendering Process that may
  have income generating benefits.
• The refining of Sugar cane and Fruit Juice
  Extracts, including the recovery of SS for
  further processing.
• The recovery of Paper Fiber for Reprocessing.

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SF Features Benefiting Industry and WWTPs

• No Chemicals
• Negliable Water Consumption
• Recovers and Dewaters Sludge in Combined Process
• Outstanding Results 40 70 SS Removal
• 25 45 Dry Substrate
• Low Maintenance Costs
• Easy Repair and Maintenance Procedure

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SF Features Cont.

• Low Power Consumption and Running Costs
• Self Cleaning Automated
• Level Sensor Controls Speed and Optimises SF
  Filtering Performance at various flow Rates All
  Automated.
• Exceptional After Sales Service and Back Up
• Compact Design More Placement Options
• Compact and Light Easily Maneuverable

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SF Features Cont.

• Refined for South African Applications
• Globally Recognised, Approved and Industry Proven
• Recovery of SS for re-processing if required
• Substantial Effluent Billing Cost Saving
  Feasible Payback Term

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THE END !