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Waste Management & Research
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What's this?

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

K. V. Rajeshwari

K. Lata

D. C. Pant

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

Waste Management & Research, Vol. 19, No. 4, 292-300 (2001)
DOI: 10.1177/0734242X0101900405
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