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INTRODUCTION TO THE TREATMENT OF TANNERY EFFLUENTS every tanner What every tanner should know about effluent treatment U nited N ations I ndustrial D evelopment.

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Presentation on theme: "INTRODUCTION TO THE TREATMENT OF TANNERY EFFLUENTS every tanner What every tanner should know about effluent treatment U nited N ations I ndustrial D evelopment."— Presentation transcript:

1 INTRODUCTION TO THE TREATMENT OF TANNERY EFFLUENTS every tanner What every tanner should know about effluent treatment U nited N ations I ndustrial D evelopment O rganization Part III J. Buljan, I. Kral Compiled by J. 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 pump used for sludge transfer Cavity Stator Rotor Housing Driving axe INLET DISCHARGE

4 Gravity thickener

5

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

7 Continuous counter-current solid bowl centrifuge

8 Belt filter press

9 Sludge inlet Belt/cloth Drained water Sludge cake

10 Characteristics of sludge dewatering equipment DecanterBelt press Plate filter press Way of operation Continuous Batch Sludge conditioning required not required Washing water not requiredrequirednot required Labour only supervision required during cake discharge Sensitive to sludge variability very sensitive less sensitive Energy required (electricity) highmediumlow Maintenance sophisticatedmediumlow

11 Dry matter content in sludge depending on process stage and/or type of dewatering equipment Treatment stage, equipment DS content % Sludge after primary clarifier Thickened mixed primary and secondary sludge (at specific load of about 60 kg DS/m 2.d) Chamber filter press with chemical conditioning Belt filter press with use of PE 20 – 25 Centrifuge – decanter Sludge after stabilization with CaO (mostly after belt filter press or centrifuge)

12 MIXED EFFLUENT SERVICE WATER Drain CATALYST MnSO 4 ALUM LIME POLYELECTROLYTE EQUALIZATION TANK WITH PUMPING STATION (with ejectors for mixing and aeration) COAGULATION TANK FLOCCULATION TANK PRIMARY SETTLING TANK FLOW MEASUREMENT CHANNEL END FLOW MEASURING WITH FLOW SUMMARISING PRIMARY TREATED EFFLUENT TO FURTHER (biological) TREATMENT e.g. at the municipal Wastewater works CHAMBER FILTER PRESS G SLUDGE THICKENER SLUDGE DRYING BEDS (optional) PRIMARY SLUDGE PUMPING STATION INLET PUMPING STATION FINE SCREEN AUTOMATIC COARSE SCREEN Submersible pump Dosing pump Motor Gate valve Agitator Simplified flow-chart of the physical-chemical (primary) treatment

13 Sludge drying beds 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 mm, approx. 100mm Drainage water outlet Drainage water outlet Sludge inlet


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