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INTRODUCTION TO THE TREATMENT OF TANNERY EFFLUENTS every tanner What every tanner should know about effluent treatment Part II J. Buljan, I. Kral Compiled.

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Presentation on theme: "INTRODUCTION TO THE TREATMENT OF TANNERY EFFLUENTS every tanner What every tanner should know about effluent treatment Part II J. Buljan, I. Kral Compiled."— Presentation transcript:

1 INTRODUCTION TO THE TREATMENT OF TANNERY EFFLUENTS every tanner What every tanner should know about effluent treatment Part II J. Buljan, I. Kral Compiled by J. Buljan, I. Kral U nited N ations I ndustrial D evelopment O rganization

2 within 2. Treatment within tannery compound A.Pre-treatment for discharge into CETP collection network – Screening – Grit & grease chamber B.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 bar screen Collected solids Raw Raw effluentFromTANNERY Screened Screened effluentToTREATMENT CHANNEL rake

4 BAR SCREEN CLEANING Manual Rotary curved Continuous chain raked Auto chain Rotary curved 90 0

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

6 SELF-CLEANING SCREEN SELF-CLEANING SCREEN PARKWOOD TYPE Effluent inflow

7 SUBMERSIBLE PUMP SUBMERSIBLE PUMP FOR EFFLUENT LIFTING Pump Lifting chain Water inlet Pump maintenance

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

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

10 ROTARY DRUM SCREEN

11 Screw (Archimedes) type pump for effluent lifting Driving mechanism The principle Effluent intake

12 Screw (Archimedes) type pump for effluent lifting

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

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

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

16 Type of sedimentation tanks Rectangular horizontal 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 Schematic cross-section view Influent Influent well Skimmer Scum trough Scraper Sludge concentrator Drive Effluent Scum draw off Sludge draw-off

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

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

23 Purification efficiency of the treatment stages referred to raw effluent Parameter Physical-chemicalBiological ReductionApprox. value Reduction * Approx. value %mg/l% SS 80 – – – 9820 – 50 BOD 5 50 – – – 9920 – 30 COD 50 – – – – 400 TKN 40 – – – – 200 Cr 92 – 975 – 1099 – 99.5< 1 S – 9010 – 2099 – 99.5< 1 TDS mainly Cl - and (SO 4 ) 2 No reduction *Approximately at the load level of 0.30 kg BOD 5 /kg MLSS, oxygen requirement of 2.0 kg O 2 /kg BOD 5 and MLSS 3300 g/m 3.


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