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INTRODUCTION TO T HE T REATMENT OF TANNERY EFFLUENTS

INTRODUCTION TO T HE T REATMENT OF TANNERY EFFLUENTS. What every tanner should know about effluent treatment. U nited N ations I ndustrial D evelopment O rganization. Part II. Compiled by J . Buljan , I. Kral. 2. Treatment within tannery compound.

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INTRODUCTION TO T HE T REATMENT OF TANNERY EFFLUENTS

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  1. INTRODUCTIONTOTHE TREATMENTOF TANNERY EFFLUENTS What every tanner should knowabout effluent treatment United NationsIndustrialDevelopmentOrganization Part II Compiled byJ. Buljan, I. Kral

  2. 2. Treatmentwithin tannery compound • Pre-treatment for discharge into CETP collection network  • Screening • Grit & grease chamber • Physical-mechanical (primary) treatment for discharge into municipal sewage  • Screening • Lifting – lifting pumps • Equalization – homogenization, ejectors • pH adjustment, coagulation, flocculation • Primary clarification/flotation • Flow-chart of the physical-chemical (primary) treatment

  3. ROUGH BAR SCREEN rake Collected solids CHANNEL bar screen Raw effluent Screened effluent From TANNERY To TREATMENT

  4. BAR SCREEN CLEANING Continuous chain raked Rotary curved 3600 Rotary curved 900 Manual Auto chain

  5. NON-AERATED GRIT AND FLOATING MATTER REMOVAL CHAMBER Periodically to the sludge disposal site SCUM Screen 20 mm Screen 10 mm Screen 6 mm SLUDGE

  6. SELF-CLEANING SCREENPARKWOOD TYPE Effluent inflow

  7. SUBMERSIBLE PUMPFOR EFFLUENT LIFTING Lifting chain Pump Pump maintenance Water inlet

  8. ROTARY DRUM SCREENKONICA TYPE – outer flow WASTWATER INLET WITH SUSPENDED SOLIDS Filtering gap Trapezoidal shaped bars SOLIDS RECOVERY FILTERED WATER DISCHARGE

  9. Rotary fine screen(inner flow) Brush Raw effluent Solids Filtering panel Internal screw Filtered effluent

  10. ROTARY DRUM SCREEN

  11. Screw (Archimedes) type pumpfor effluent lifting The principle Effluent intake Driving mechanism

  12. Screw (Archimedes) type pumpfor effluent lifting

  13. Continuous level measuring Pump dry protection level Equalization – homogenization tankSchematic view TO SUCCESSIVE TREATMENT High level alarm EFFLUENT INFLOW Bypass Free board

  14. Coagulation and flocculation (scheme) Service water POLY- ELECTROLYTE ALUM LIME Dosing pump Dosing pump Dosing pump DRAIN WASTEWATER INLET WASTEWATER OUTLET COAGULATION TANK FLOCCULATION TANK

  15. Ejector for mixing and aeration Air inlet Wastewater Submersible pump Air-wastewater mixture outlet Ejector Wastewater inlet

  16. Type of sedimentation tanks Rectangularhorizontal flow

  17. Type of sedimentation tanks Circular,radial-flow

  18. Type of sedimentation tanks Hopper-bottomed,upward-flow

  19. Typical sedimentation tank Scraper bridge Scraper

  20. Typical sedimentation tank Scum trough Sludge concentrator Scraper Schematic cross-section view Drive Influent well Skimmer Scum draw off Effluent Influent Sludge draw-off

  21. Rectangular sedimentation tankwith travelling bridge TRAVELLING BRIDGE TRAVELLING BRIDGE Rail INFLUENT Scum trough EFLUENT SLUDGE DRAWOFF Screw cross collector Sludge hopper

  22. Dissolved air flotation unit (DAF) Floated sludge skimmer TREATED EFFLUENT RAW EFFLUENT FLOTATED SLUDGE DRAWOFF Pressure release valve AIR PRESSURED RECYLE WTH DISSOLVED AIR SETTLED SLUDGE RECYCLE FLOW Recycle pump Air saturation tank

  23. Purification efficiency of the treatment stages referred to raw effluent *Approximately at the load level of 0.30 kg BOD5/kg MLSS, oxygen requirement of 2.0 kg O2/kg BOD5 and MLSS 3300 g/m3.

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