NOVELTY - The system has a cooler and settling chamber (2) for cooling producer gas and settling down the particulates present in gas. A tar catcher (3) is used for isolating tar present in gas. An effluent evaporator is used for receiving hot flue gases and discharging hot flue gas to atmosphere through fan. A sealed blower is used for passing mixture of cracked tar gas with evaporated effluent to oxidation zone. The refiring unit is used for refiring cracked tar and evaporated effluent, such that oxidation zone temperature is increased so as to generate better quality gas.    USE - Zero effluent discharge biomass gasification system for gasifying biomass such as wood, peat, shells, lignite, coal, and coke (all claimed).    ADVANTAGE - The zero effluent discharge biomass gasification system can produce better quality, dry and clean producer gas from any biomass, through refiring of cracked tar gas and evaporated effluent in oxidation zone of gasifier. The discharge of effluent to the outside environment can be prevented effectively. The re-firing of the cracked tar gas and evaporated effluent in oxidation zone can be performed easily and efficiently. The performance of the gasification system can be improved. The system can produce dry and particulate and tar free producer gas to be used in any furnace, kiln, boiler or combustion chamber. The system incorporates wet electrostatic precipitator to remove the tar from the producer gas. A zero gas leakage system can be provided. The maintenance and operation of system can be facilitated. The condensers can easily and effectively condense any residual tar and water vapor from the producer gas. The gasification system can produce a very small amount of activated carbon through steam reformation of tar in presence of nickel/tungsten wire mesh as catalyst. The contamination of water can be prevented.    DETAILED DESCRIPTION - The water seal is provided in the gasifier (1), so as to prevent the air ingress to the gasifier and to prevent the gas leakage to the atmosphere, The temperature of the rotary kiln is maintained at 400-500 degrees c, such that the tar gets cracked and the cracked tar gas is taken into nickel or tungsten wire mesh catalyst incorporated at the kiln exit section where the cracked tar gets partially steam reformed to get activated carbon. The effluent evaporator is used for collecting the contaminated effluent from primary gas cooler and settling chambers and final gas cooler cum settling chamber (10).    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of the zero effluent discharge biomass gasification system.    Gasifier (1)    Primary gas cooler and settling chamber (2)    Tar catcher (3)    Final gas cooler cum settling chamber (10)    Rotary tar kiln cum effluent evaporator (11)