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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

INTRODUCTIONTOTHE TREATMENTOF TANNERY EFFLUENTS

What every tanner should knowabout effluent treatment

United NationsIndustrialDevelopmentOrganization

Part II

Compiled byJ. Buljan, I. Kral

2 treatment within tannery compound
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
rough bar screen
ROUGH BAR SCREEN

rake

Collected

solids

CHANNEL

bar screen

Raw effluent

Screened effluent

From

TANNERY

To

TREATMENT

bar screen cleaning
BAR SCREEN CLEANING

Continuous chain raked

Rotary curved 3600

Rotary curved 900

Manual

Auto chain

non aerated grit and floating matter removal chamber
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

submersible pump for effluent lifting
SUBMERSIBLE PUMPFOR EFFLUENT LIFTING

Lifting

chain

Pump

Pump maintenance

Water inlet

rotary drum screen konica type outer flow
ROTARY DRUM SCREENKONICA TYPE – outer flow

WASTWATER INLET

WITH SUSPENDED SOLIDS

Filtering gap

Trapezoidal shaped bars

SOLIDS RECOVERY

FILTERED WATER

DISCHARGE

rotary fine screen inner flow
Rotary fine screen(inner flow)

Brush

Raw effluent

Solids

Filtering panel

Internal screw

Filtered effluent

screw archimedes type pump for effluent lifting
Screw (Archimedes) type pumpfor effluent lifting

The principle

Effluent intake

Driving

mechanism

equalization homogenization tank schematic view

Continuous level

measuring

Pump dry

protection level

Equalization – homogenization tankSchematic view

TO SUCCESSIVE

TREATMENT

High level alarm

EFFLUENT INFLOW

Bypass

Free board

coagulation and flocculation scheme
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

ejector for mixing and aeration
Ejector for mixing and aeration

Air inlet

Wastewater

Submersible

pump

Air-wastewater

mixture outlet

Ejector

Wastewater inlet

type of sedimentation tanks
Type of sedimentation tanks

Rectangularhorizontal flow

type of sedimentation tanks1
Type of sedimentation tanks

Circular,radial-flow

type of sedimentation tanks2
Type of sedimentation tanks

Hopper-bottomed,upward-flow

typical sedimentation tank
Typical sedimentation tank

Scraper bridge

Scraper

typical sedimentation tank1

Typical sedimentation tank

Scum trough

Sludge

concentrator

Scraper

Schematic cross-section view

Drive

Influent well

Skimmer

Scum

draw

off

Effluent

Influent

Sludge draw-off

rectangular sedimentation tank with travelling bridge
Rectangular sedimentation tankwith travelling bridge

TRAVELLING

BRIDGE

TRAVELLING

BRIDGE

Rail

INFLUENT

Scum

trough

EFLUENT

SLUDGE

DRAWOFF

Screw cross

collector

Sludge

hopper

dissolved air flotation unit daf
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

purification efficiency of the treatment stages referred to raw effluent
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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