The amount of sewage sludge production is increasing with the raising of wastewater treatment in China,how to dispose it has been an urgent problem for government and wastewater treatment plants.Sewage sludge contains various kinds of pathogenic bacterium and heavy metals which may cause serious environmental pollution if without correctly disposed.However,sludge also contains various kinds of nutrients and organic matter,which are necessary for plant growth,and would be a resource if it were utilized for p...