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.
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) % removal of suspended solids The cake (dewatered Sludge) % Dry substrate Weight : 375 Kg (SF2000)725 Kg (SF6000) Energy Consumption:2.5 Kw (SF2000) 4.2 Kw (SF6000)
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 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
Applications A) Overview of Expanded process at Municipal : WWTP’S
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 - 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 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 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. 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 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 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
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. 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