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Waste Management & Research, Vol. 19, No. 4, 292-300 (2001)

A novel process using enhanced acidification and a UASB reactor for biomethanation of vegetable market waste

K. V. Rajeshwari

Tata Energy Research Institute, Darbari Seth Block, Habitat Place, Lodhi Road, New Delhi - 110 003, India

K. Lata

Tata Energy Research Institute, Darbari Seth Block, Habitat Place, Lodhi Road, New Delhi - 110 003, India

D. C. Pant

Tata Energy Research Institute, Darbari Seth Block, Habitat Place, Lodhi Road, New Delhi - 110 003, India

V. V. N. Kishore

Tata Energy Research Institute, Darbari Seth Block, Habitat Place, Lodhi Road, New Delhi - 110 003, India

The processing of solid vegetable market waste was attempted in a two-stage digester. Initially, for the hydrolysis and acidification of waste, enhanced extraction process was carried out by continuous sprinkling of water over the bed of waste in a mild steel 100 l solid bed digester. The leachate obtained after completion of acidification phase was further treated in 24.6 l UASB reactor for biogas production. The effect of waste-liquid ratio, dilution and sprinkling rate on the digestion of waste were studied. A high strength leachate, with a COD of 25,298 mg l-1 and total volatile fatty acids concentration of 11.3 g l-1, was obtained as a result of hydrolysis and acidification in a very short retention time of 40 h. The COD reduction of 94% was achieved during UASB reactor operation at organic loading rate of 19.6 kg COD m day-3. A minimum hydraulic retention time of 16 h was achieved.

Key Words: Vegetable market waste • hydrolysis • acidification • sprinkling • leachate • UASB • solid bed • biomethanation • solid waste • waste treatment • biogas


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