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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 III. Compiled by J . Buljan , I. Kral. 3. Sludge dewatering. Sludge thickeners Sludge pumps Filter press

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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 III Compiled byJ. Buljan, I. Kral

  2. 3. Sludge dewatering • Sludge thickeners • Sludge pumps • Filter press • Centrifuge • Belt filter press • Flow-chart of the physical-chemical (primary) treatment • Sludge drying beds

  3. Progressing cavity pumpused for sludge transfer Driving axe INLET Stator Housing Rotor DISCHARGE Cavity

  4. Gravity thickener

  5. Gravity thickener

  6. Recessed plate filter press Plate Cloth Sludge cake layer Emulsion layer Clarified water Clarified water Air injection Air pump Compressor Slurry tank

  7. Continuous counter-currentsolid bowl centrifuge

  8. Belt filter press

  9. Belt filter press Sludge inlet Drained water Sludge cake Belt/cloth

  10. Characteristicsof sludge dewatering equipment

  11. Dry matter content in sludge depending on process stage and/or type of dewatering equipment

  12. Submersible pump Simplified flow-chart of thephysical-chemical (primary) treatment Dosing pump SERVICE WATER Motor CATALYST MnSO4 Gate valve POLYELECTROLYTE LIME ALUM Gate valve Agitator Drain Drain Drain Drain MIXED EFFLUENT EQUALIZATION TANK WITH PUMPING STATION (with ejectors for mixing and aeration) AUTOMATIC COARSE SCREEN INLET PUMPING STATION FINE SCREEN END FLOW MEASURING WITH FLOW SUMMARISING FLOCCULATION TANK COAGULATION TANK PRIMARY TREATED EFFLUENT TO FURTHER (biological) TREATMENT e.g. at the municipal Wastewater works PRIMARY SETTLING TANK FLOW MEASUREMENT CHANNEL SLUDGE THICKENER G CHAMBER FILTER PRESS PRIMARY SLUDGE PUMPING STATION SLUDGE DRYING BEDS (optional)

  13. Sludge drying beds Sludge inlet Drainage water outlet Drainage water outlet Sludge inlet Sludge approx. 500mm Sand 1-3 mm, approx. 150mm Sand 3-6 mm, approx. 150mm Broken stone or gravel 6-15 mm, approx. 100mm Broken stone or gravel 15-50 mm, approx. 100mm

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