to homes [50]. In Shandong, the amount of corn stalks required to
provide a household with its daily cooking energy needs when the
stalks are converted to producer gas is about half as large compared
to that required when they are burned directly. In India, cattle dung
is burned directly for cooking in many rural homes. In a few villages,
dung is first converted into biogas by anaerobic digestion, producing
valuable fertilizer as a by-product. Because of the high efficiency
with which biogas can be used, some 20% less cattle dung is needed
to meet the same cooking needs as with direct burning [51].