Bangalore Method (Hot Fermentation Process)

Bangalore Method (Hot Fermentation Process)

Bangalore Method (Hot Fermentation Process)
It is recommended as a satisfactory method of disposal of town wastes and nightsoil. Trenches are dug 90 cm (3 ft.) deep, 1.5 to 2.5 m broad and 4.5-5.1m long, depending upon the amount of refuse and night soil to be disposed of. Depths greater than 9 cm are not recommended because of slow decomposition. The pits should be located not less than 800m from city limits. The composting procedure is as follows:

First a layer of refuse about 15 cm thick is spread at the bottom of the trench. Over this, night-soil is added corresponding to a thickness of 5 cm. Then alternate layers of refuse and nightsoil are added in the proportion of 15 cm and 5 cm respectively, till the heap rises to 30 cm above the ground level. The top layer of refuse should be at least 25 cm thickness. Then the heap is covered with excavated earth. If properly laid, a man's legs will not sink when walking over the compost mass.

Within 7 days as a result of bacterial action considerable heat (over 60°C) is generated in the compost mass. This intense heat which persists over 2 or 3 weeks, serves to decompose the refuse and night-soil and to destroy all pathogenic and parasitic organisms. At the end of 4-6 months, decomposition is complete and the resulting manure is a well-decomposed, odourless, innocuous material of high manurial value ready for application to the land.

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