Table 1 gives the characteristics of spent wash generated from the three types of manufacturing processes. lt 1s seen that while the spent wash generation per litre of alcohol production is less from the Continuous and 81ostill processes when compared to the Batch process, the spent wash .
Direct spent wash as well as biomethanated effluent is concentrated in a multistage vacuum evaporator to 4060% solids. The total process is under vacuum and the vapors generated in the system are recompressed in a TVR/MVR to economize steam consumption.
The wastewater released from distilleries is known as spent wash, which is highly acidic in nature. In the year 1999, there were 285 distilleries in India producing 9 l of alcohol and generating 4x10 10 l of wastewater each year (Joshi, 1999). This number has gone up to 319, producing 9 l of alcohol and generating
Soil reclamation is another technology for utilization of distillery spent wash. Application of 500 m 3 /ha of spent wash to sodic soils followed by 2 to 3 leaching with water achieved effective reclamation after 60 days with a reduction in soil pH and increase in organic .
In the present study, anaerobic treatment of distillery wastewater (spent wash) was carried out on plant scale. Spent wash is characterized by high temperature (8090 0C), low pH (), dark brown colour, jagerry odor, high BOD ( mg/l) and high COD ( mg/l).
Spent wash of Indian distilleries also contains higher amount of potash as compared to those from distilleries abroad. Table 1 shows the average characteristics of the spent wash of Indian distilleries.
Spent wash is the approximately 1316 times more by volume to that of the alcohol. It is highly organic brown in colour. spent wash is having is having very high BOD and COD values as it is very strong organic and is very troublesome to treat spent wash. [1].In India billion liters of alcohol is produces in 298 distilleries which ...
The wastewater generally known as 'spent wash' is one of the most difficult waste products to dispose off, because of low pH and dark brown colour. It has high chemical oxygen demand (COD) and biological oxygen demand (BOD), causing pollution in the receiving water. The Distillery effluent spent wash is of extremely polluting nature.
Coprocessing of distillery spent wash concentrate in . In order to utilize the hazardous wastes generated in the cement industry the Central Pollution Control Board has come up with the draft guidelines (in February 2010) dealing with the coprocessing of distillery .
The above discussed processes potash as K O, to percent phosphorus as PO and to are much effective in the disposal of distillery spent wash. percent Nitrogen as N2. Moreover these methods help to recover revenue from the distillery waste water.
The production of distillery must be incorporated The characteristic of spent wash do not allow its discharge in the design to accommodate the increased amount of into a .
An attempt has been made to high light the treatment of distillery spent wash by using natural adsorbent. The results obtained herein indicate the feasibility of activated carbon used as an adsorbent for removal of pollutants from distillery spent wash. The results show the significant amount of reduction of pollutants by activated carbon.
Hence, Central Pollution Control Board (CPCB) proposed, coprocessing of concentrated spent wash in cement kiln. There are around 400 distillery units in India, with a total production capacity of about 3800 million litres of alcohol.
The color of the spent wash interferes with its oxygenation and self purification. Present Status of Treatment and Disposal: Spent wash treatment is proposed by three different routes currently are as follows, (a) Concentration followed by incineration. (b) Anaerobic digestion with biogas recovery followed by aerobic polishing.
Disposal of distillery spent wash on land is equally hazardous to the vegetation. It is reported to reduce soil alkalinity and manganese availability, thus inhibiting seed germination .Kannan and Upreti reported highly toxic effects of raw distillery effluent on the growth and germination of Vigna radiata seeds even at low concentration of 5% (v/v).
Treatment of Distillery Spent. wash Babu Alappat ... Distillery Alcohol Spent wash /lit – COD of about 1. Molasses Distilleries • Spent wash is the main waste stream – It has a BOD5 of about to brown – About 15% solids content – Ash contains Potash as K2O .000 mg/lit – pH – acidic (4 – 5) – Colour ...