Anaerobic Treatment Of Wastewater (Dunder) From Distilleries
OVERVIEW The waste from the distillery, called Dunder, Vinnasse or stillage is a brown liquid with a characteristic aromatic odour. It is the residue from the distillation column left after rum or ethanol is produced.
Rum/ethanol is produced by yeast fermentation of a mixture of molasses, water, sulfuric acid and essential nutrients such as ammonium sulphate. The mixture is left in vats to ferment for a period, when sugars present are converted to ethanol. The ethanol is then extracted from the mixture (wash) by distillation. The residue from the distillation column is discarded as dunder.
The dunder leaving the plant is hot and acidic, high in organic and inorganic matter. The organic matter includes unfermented sugar, alcohol and dead yeast cells. Dunder has a high pollutant load similar in effect to that of raw sewage due to its high organic content.
Pilot Plant studies on the feasibility of anaerobic digestion of Distillery waste (dunder) carried out at SRC
Pilot plant investigations were done at SRC to determine the level of treatment that can be achieved by applying anaerobic digestion to treat dunder. The experimental set-up at SRC includes the operation of two pilot plants that were monitored both manually and by computer control. The computer control involved the total automation of the pilot plant operation applying the German software DASY Lab. Waste water samples were collected from Inswoods Estate and Monymusk Distilleries.
The experiments showed that the anaerobic digestion under controlled conditions result in reducing COD (up to 100,000 mg/l) by as much as 80%. Due to the high organic load of the dunder the reduction by single stage anaerobic digestion alone will not satisfy the discharge standards as stated by the NRCA.
Anaerobic Treatment Of Wastewater (Dunder) From Distilleries
OVERVIEW
The waste from the distillery, called Dunder, Vinnasse or stillage is a brown liquid with a characteristic aromatic odour. It is the residue from the distillation column left after rum or ethanol is produced.
Rum/ethanol is produced by yeast fermentation of a mixture of molasses, water, sulfuric acid and essential nutrients such as ammonium sulphate. The mixture is left in vats to ferment for a period, when sugars present are converted to ethanol. The ethanol is then extracted from the mixture (wash) by distillation. The residue from the distillation column is discarded as dunder.
The dunder leaving the plant is hot and acidic, high in organic and inorganic matter. The organic matter includes unfermented sugar, alcohol and dead yeast cells. Dunder has a high pollutant load similar in effect to that of raw sewage due to its high organic content.
Pilot Plant studies on the feasibility of anaerobic digestion of Distillery waste (dunder) carried out at SRC
Pilot plant investigations were done at SRC to determine the level of treatment that can be achieved by applying anaerobic digestion to treat dunder. The experimental set-up at SRC includes the operation of two pilot plants that were monitored both manually and by computer control. The computer control involved the total automation of the pilot plant operation applying the German software DASY Lab. Waste water samples were collected from Inswoods Estate and Monymusk Distilleries.
The experiments showed that the anaerobic digestion under controlled conditions result in reducing COD (up to 100,000 mg/l) by as much as 80%. Due to the high organic load of the dunder the reduction by single stage anaerobic digestion alone will not satisfy the discharge standards as stated by the NRCA.
Sugar Wastewater | Distilleries | Coffee Industry | Hotel | Dairy Industry