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Treatment of Distillery Effluent
The distillery effluent does not contain toxic substances but has high oxygen demand and is therefore, harmful. It consists of two components :
(i) spent wash, containing 9-10% solids, 80,000-60,000 ppm kilo litre of rectified spirit produced) with 25-30% solids and 100,000-125,000 ppm B.O.D. (B.O.D. =biological oxygen demand ; C.O.D. = chemical oxygen demand). The disposal of these two wastes into land or water is a great environmental hazard. The standard laid down by the Government of India for disposal are 100 ppm B.O.D. for land disposal and 30 ppm for disposal in natural water streams.

Primary and secondary treatments used for disposal of distillery effluents

Primary treatments

Secondary treatments

1. Anaerobic digestion (in lagoons or closed digestors)

1. Anaerobic filtration

2. Concentration and incineration (burning to ashes in a furnace, etc.)

2. Primary and extended aeration
  3. Sunbed drying


Different Methods of Distillery Effluent Treatment

Different Methods of Distillery Effluent Treatment

1. Discharge to water stream or land 6. Effluent (spent wash) (40000-50000 ppm) BOD 11. Anaerobic Closed Digester (Biometha Nation)
2. Effluent (500 ppm BOD) 7. RS 12. Effluent (5000-10000 ppm BOD)
3. Aerobic Secondary Treatment 8. Wash (7-8% alcohol) 13. Aerobic Secondary Treatment
4. Effluent (1000-2000) ppm BOD) 9. Molasses 14. Effluent (500 ppm BOD)
5. Concentration and incineration 10. Anaerobic Lagoons 15. Dilution with water
16. Discharge to Water Stream or Land

 

  

 
 

 
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