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 effluent2) 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/SteelHydraulic loading of m³ / HrEndless Cloth Filter, Woven Polyester, mm pores (785 Microns Thick)40-70 % removal of suspended solidsThe cake (dewatered Sludge) % Dry substrateWeight : 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 ClothRemoval of 40-70% of suspended solidsThe filtered water is released through outlet-pipeSuspended solids are conveyed by filter cloth & dumped into a sludge compartmentExcess sludge removed from cloth by an Air knifePrimary Sludge dewatering is facilitated by gravity during transport of the sludge to the trough
5 Process DescriptionSecondary dewatering of sludge is facilitated by screw press compacting the sludge in the press cylinderExcess water is drained via secondary outletCompressed, dewatered sludge (cake) is released via a spring loaded lid on the press cylinderExcess Fat deposits are removed from cloth twice per day via Hot water spray (20 Ltrs Each) - AdjustableOn/Off & operating speed is controlled by pressure transmitter, measuring the level of inflow, to achieve optimal balance between inflow & the filters filtration propertiesProcess is completely automated, incl. Cleaning = minimal maintenance
6 ApplicationsA) Overview of Expanded process at Municipal : WWTP’S
7 Applications Cont. Salsnes Filter removes SS in parallel to PST, possibly allowingdecommissioning of the digester.Sludge cake to be stabilised (composted) & sent to landfill or otherAlternately sludge must not be compressed & dewatered, & sent to digester to neutralise biological activity.
8 Installation Options - WWTP Relieve overloaded capacity – SF installed prior to PSTSF installed after PST to reduce loading on aeration basinsSF installed parallel with PST, tapping back to aeration basins, removing excess flow rates from PSTReduce 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 filtrationTanning ProcessesPaper MillsCanneriesFish, Poultry food processors and AbattoirsFruit Juice ProcessingBiofuel ProcessesBreweriesScreening Before Reverse Osmosis – DesalinisationAnimal Feed ManufacturersGrain 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 ChemicalsNegliable Water ConsumptionRecovers and Dewaters Sludge in Combined ProcessOutstanding Results : 40 – 70 % SS Removal25 – 45 % Dry SubstrateLow Maintenance CostsEasy Repair and Maintenance Procedure
14 SF Features – Cont. Low Power Consumption and Running Costs Self Cleaning – AutomatedLevel Sensor Controls Speed and Optimises SF Filtering Performance at various flow Rates – All Automated.Exceptional After Sales Service and Back UpCompact Design – More Placement OptionsCompact and Light – Easily Maneuverable
15 SF Features – Cont. Refined for South African Applications Globally Recognised, Approved and Industry ProvenRecovery of SS for re-processing if requiredSubstantial Effluent Billing Cost Saving = Feasible Payback Term