Organic Waste Recycling

104 Organic waste recycling: technology and management

Figure 3.5 Effect of compost feed solids content on the wet weight recycle ratio needed
to achieve a 40% mixture solids content (Haug 1979; reproduced by permission of the
Water Pollution Control Federation USA)

Example 3.2

From the data of Example 3.1, suppose the moisture content of the composted
product is 20%. Determine the quantity of the composted product needed to be
recycled to achieve 40% mixture solids content.
From Example 3.1, moisture content of the mixture between septic tank
sludge and rice straw is:

Compost feed solids, percent (Sc)

Sr= Fractional solids content

of compost recycle

Recycle ratio,

Rw

, based on total wet weight