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

Abstract

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.

Keywords

Vegetable market waste hydrolysis acidification sprinkling leachate UASB solid bed biomethanation solid waste waste treatment biogas

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References

APHA (1985) Standard methods for the examination of water and waste water. 16th edition American Public Health Association, Washington, DC.

Cho, J. K. , Park, S. C. & Chang, H. N. (1995) Biochemical methane potential and solid state anaerobic digestion of Korean food wastes. Biores. Technol., 52: 245–253.

Frederick, G. P. (1992) Anaerobic treatment: Fundamental concepts, applications and New Horizons. In Design of Anaerobic Processes for the Treatment of Industrial and Municipal Wastes, ed. Joseph F. Malina & Frederick G. Pohland Water Quality Management Library, Vol. 7. Technomic publishing company, Inc., Pennsylvania, USA.

Ghosh, S. (1990) Principles and potentials of biphasic fermentation. International conference on biogas technologies and implementation strategies, January 10–15, Pune, India, 473–497.

Gunaseelan, V. N. (1997) Anaerobic digestion of biomass for methane production: A Review. Biomass and Bioenergy, 13, 1/2, 83–114.

Jagadish, K. S. , Chanakya, H. N. , Rajabapaiah, P. & Anand, V. (1998) Plug flow digesters for biogas generation from leaf biomass. Biomass and Bioenergy, 14, 5/6, 415–423.

Kalia, V. C. , Kumar, A. , Jain, S. R. & Joshi, A. P. (1992) Biomethanation of plant materials. Biores. Technol., 41, 209–212.

Mata-Alvarez, J. , Llabres, P. , Cecchi, F. & Pavan, P. (1992) Anaerobic digestion of the Barcelona central food market organic wastes: Experimental study. Biores. Technol., 39, 39–48.

Mata-Alvarez, J. , Cechi, F. , Pavan, P. & Llabres, P. (1990) The performances of digesters treating the organic fraction of municipal solid wastes differently stored. Biological Wastes, 33, 181–199.

10.

Nand, K. (1995) Evaluation of fruit and vegetable processing wastes for bioconversion to methane by anaerobic digestion. In Wealth from Waste, ed. Sunil Khanna & Krishna Mohan . Tata Energy Research Institute, New Delhi, India, pp. 227–243.

11.

Rajeshwari, K. V. , Pant, D. C. , Kusum Lata & Kishore, V. V. N. (1998) Studies on biomethanation of vegetable market waste. Biogas Forum, III, No. 74, 4–12.

12.

Rao, A .G. , Kusum Lata , Raman, P. , Kishore, V. V. N. & Ramachandran, K. B. (1997) Studies of anaerobic treatment of synthetic waste in a UASB reactor. Indian J. Environmental Protection, 17, 5, 349–354.

13.

Raynal, J. , Delgenes, J. P. & Moletta, R. (1998) Two phase anaerobic digestion of solid wastes by a multiple liquefaction reactors process. Biores. Technol., 65, 97–103.

14.

Singh, H. & Maheshwari, R. C. (1995) Indian advances in biogas technology-Review of work done under AICRP on RES, Biogas Forum, Vol. I, No. 60, 4–17.

15.

Viswanath, P. , Sumithradevi, S. & Nand, K. (1992) Anaerobic digestion of fruit and vegetable wastes for biogas production. Biores. Technol., 40-40,43-43.

16.

Zihua, F. , Yihua, K. , Xiaogang, H. , Yongliang, P. & Datian, G. (1992) The study of treating pharmaceutical wastewater and forming conditions of granular sludge in an UASB reactor, Biogas Forum, 2,43–47.