Method for improving of activated sludge drying by the appropriate foaming pre-treatment

Due to the high viscosity and stickiness of dehydrated sludge, combination foaming pretreatment drying process is an effective method improve performance sludge. In this study, alkali industrial lignin fiber addition followed by mechanical whipping was employed for dewatered Using alone as agent, optimal NaOH found at 2.5 wt%, which superior adding CaO. Considering maximum efficiency, 2% FH-300 collected a conditioner 1% optimal. The foams in sludge were highly stable. total number bubbles with different densities had big differences. diameters concentrated on range 0.1 mm-0.3 mm.