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Waste Management & Research
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Biotechnology for aerobic conversion of food waste into organic fertilizer

Olena Stabnikova

School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798. Tel: +65 6790 4740; fax: +65 6792 1650 costab{at}ntu.edu.sg

Hong-Bo Ding

Joo-Hwa Tay

Jing-Yuan Wang

School of Civil and Environmental Engineering, Nanyang Technological University, Singapore

A biotechnology for aerobic conversion of food waste into organic fertilizer under controlled aeration, stirring, pH and temperature at 55–65°C, is proposed. To maintain neutral pH at the beginning of the bioconversion 5% CaCO 3 was added to the total solids of the food waste. The addition of 20% horticultural waste compost as a bulking agent to the food wastes (w.w./w.w.), improved the bioconversion and increased the stability of the final product. No starter culture was needed for aerobic bioconversion of food waste into organic fertilizer for 10 days. The low contents of heavy metals in the raw materials used in the bioconversions ensured the safety of fertilizer from food waste for application in agriculture. The addition of 4% organic fertilizer to the subsoil increased the yield and growth of Ipomoea aquatica(Kang Kong) by 1.5 to 2 times. The addition of phosphorus is required to enhance the positive effect of organic fertilizer on plant growth.

Key Words: Aerobic bioconversion • fertilizer • food waste • horticultural waste compost • plant growth: wmr 769–9

Waste Management & Research, Vol. 23, No. 1, 39-47 (2005)
DOI: 10.1177/0734242X05049768
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