Salsnes Filter OverviewSalsnes Filter Overview

Salsnes Separation ( S.A.) Pty Ltd

Devlyn Fraser

Product IntroductionProduct 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.

Technical OverviewTechnical 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)

Process Description 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

Process DescriptionProcess Description

Secondary dewatering of sludge is facilitated by screw press compacting the sludge in the press cylinder

a) 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

ApplicationsApplicationsA) Overview of Expanded process at Municipal : WWTP’S

PST

Solids (underflow) Water (Overflow)

DIGESTOR AERATION BASIN Digested Sludge Biological treatment

Supplies O2 to Microbes

Microbes eat organics,

1. Belt Press pathogens & bacteria

2. Irrigated to Land 3.Composted 4.Dewatered - Incinerated Overflow

CLARIFIER Chlorine GasClean disposable water Ponds Rivers Industries

Underflow Activated Sludge Biologically active

Waste activated Sludge Activated SludgeReturned to Aeration basinto balance Microbe population

Sludge returned to digestor Drying beds Co-Digesting Mechanical dewatering

Irrigation to land

Applications Cont.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.

Installation Options - WWTPInstallation 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

Applications to avoid in WWTPApplications 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.

Industrial ApplicationsIndustrial 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

Industrial Applications Cont.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.

SF Benefits - Industrial Processes 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.

SF Features – Benefiting SF Features – Benefiting Industry and WWTP’sIndustry 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

SF Features – Cont.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

SF Features – Cont.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

PHOTO’SPHOTO’S

PHOTO’SPHOTO’S

PHOTO’SPHOTO’S

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