Dr'D'R'Ranade

1
Dr.D.R.Ranade Dr.T.Y.Yeole
High Rate Two Stage Anaerobic Treatment for
Distillery Waste
2
Generation of the waste

• 1 liter alcohol distilled ? 15 liter wastewater
  
• No. of distilleries Nearly 270, Maharashtra
  gt100, Alcohol gt1000 KiloL
• Distillery waste generated 15,000 M3/d
• Highly coloured - dark brown
• High strength, COD 90,000-1,20,000 ppm BOD
  60,000 ppm, acidic pH 3-4,
• high sulphate6-10 g/l, high potassium
• Hence treatment necessary.

3
Options for Treatment

• Concentration and incineration
• Use as animal feed, organic fertilizer
• not commercially viable
• High salt and acidic pH.
• Composting
• slow process-12 to 14 weeks, large land
  requirement, unavailability of filler material,
  seepage of waste, highly difficult to use in
  rainy season limited application

4
Aerobic Biological treatment

• Highly energy intensive
• Odour nuisance
• High cost
• Generation of large quantity of sludge
• Hence not preferred

5
Anaerobic treatments

• Advantages Energy Generation (Biogas), low
  sludge, less energy intensive
• Commonly preferred method of treatment
• Different reactor designs -
• conventional , anaerobic contact, anaerobic
  filter, upflow anaerobic sludge blanket(UASB)
• Different temperatures - ambient and high - 550 C

6
Problems Generally Encountered

• High strength of waste demands dilution waste
  before treatment
• Increases the volume of wastewater to be
  treated- increase in reactor volume- increase in
  operational cost.
• More land for final disposal,
• Monophasic methods highly susceptible to changes
  in environmental conditions, shock-load,
• Recovery of sour digester is difficult.

7
ARI MethodHigh Rate Two Stage Anaerobic Treatment

• Raw waste is treated without dilution with water
• Organic loading rate
• 22-23 Kg COD/M3/day
• Two stages - Acidogenic and Methanogenic reactor
• Use of specially selected methanogens
• Addition of nutrients in minute quantity
• Recirculation of sludge.

8
Advantages of ARI Method

• Water is not required for dilution
• Comparatively smaller digester volume
• Less space for secondary treatrment
• 15-20 M3 biogas / M3 waste / day.
• 55-60 methane.
• Over 65 reduction in COD and 85 in BOD
• Better control, withstand shock loads
• Easy reestablishment of process in sour digester

9
From Lab to Field

• Agharkar Research Institute
• and
• Vasantdada Sugar Institute
• are working together for field scale trials