Effect of distillery effluent and organic amendment on yield and economics of rice

摘要

Nearly 12 to 14 litres of effluent from distillery units in Tamil Nadu for the production of every one litre of alcohol,are discharged. Each distillery unit is generating 5 - 10 lakh litre of raw effluent every day. Some units have installed bio-methanization plants for producing biogas from the raw effluent and discharging the treated effluent with 90 per cent reduction in BOD (4500 ppm) and 63 per cent reduction in COD (35,000) ppm). These values are found to exceed the limits prescribed by Pollution Control Board, Tamilnadu. (Devarajan and Oblisami, 1995). Devarajan et al (1994) reported that the distillery effluent could be considered as a liquid manure and controlled application of the treated effluent can increase the productivity of soils and crops. Hence an attempt was made to study the effect of distillery effluent and organic amendments on yield and economics of rice.