Description and salient Technical features
Cotton Textile Mills generate about 80,000 to 85,000 tonnes of solid cellulosic wastes popularly known as willow-dust and cyclone dust. These waste materials are rich in cellulose and hence suitable for biogas production. CIRCOT has therefore developed methods for producing biogas using these materials both by a (i) batch fermentation process and a (ii) semi continuous fermentation process.
In a nut shell, the process involves treating willow-dust with 1% NaOH (w/w) and aerobic digestion for 72 hours followed by anaerobic fermentation. Large scale trials indicated that 1 tonne of willow - dust produces 600 m3 of biogas (equivalent to 18 LPG cylinders of 14.5 kg) in 45 days and 300 kg of good quality biomanure.
Experiments under field conditions on cotton crop under irrigations indicated that application of the biomanure prepared from willow-dust at the rate of 5 tonnes per hectare is equivalent to 10 tonnes of FYM or 80:40:40 of N, P and K per hectare.
Cost: Rs.5-6 lakh (Capital cost)
How the new technology will impact the income of the farmers / end users:
Willow dust can be used for the production of biogas under high solid loadings which can be used for singeing.