Waste Bulking agent used References Water hyacinth Cattle manure, sawdust [12] Piggery waste Straw, sawdust [9] Water hyacinth Cow dung slurry [12] Water hyacinth Cow manure [16] Food waste Chopped hay, sawdust, wheat straw [3] Olive-mill wastewater sludge Cotton waste, maize straw [7] Sugarbeet vinasse Phosphate rock [6] Food waste Rice husk, sawdust, rice bran [1]

Table 2: Different type of waste with bulking agents in different studies of composting.