1. Salsnes Filter Overview
Salsnes Separation ( S.A.) Pty Ltd
Devlyn Fraser

2. 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.

3. Technical Overview 2 Models, SF 2000 & SF 6000
Manufactured in 304 & 316 S/Steel
Hydraulic loading of m³ / Hr
Endless Cloth Filter, Woven Polyester, mm pores (785 Microns Thick)
40-70 % removal of suspended solids
The cake (dewatered Sludge) % Dry substrate
Weight : 375 Kg (SF2000) 725 Kg (SF6000)
Energy Consumption: 2.5 Kw (SF2000) Kw (SF6000)

4. 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

5. 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

6. Applications
A) Overview of Expanded process at Municipal : WWTP’S

7. 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.

8. 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

9. 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.

10. 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

11. 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.

12. 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.

13. SF Features – Benefiting Industry and WWTP’s
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

14. 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

15. 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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