Analysis of Bioavailability of Carbon and Phosphorus in Residual Sludge Cracked by Ultrasound
To achieve the resource utilization of residual sludge,this study used an ultrasonic cracking device to re-lease C and P from the residual sludge.The ultrasonic cracking parameters was optimized,and the compositions of the solid and solution before and after crushing were analyzed.The results showed that at ultrasound power of 720 W,car-bon and phosphorus were completely released from the sludge in 22 minutes.Three dimensional fluorescence and phos-phorus morphology analysis showed that the main components in the supernatant after ultrasonic cracking were organ-ic carbon and organic phosphorus,and the bottom layer was an inorganic dehydrated solid.Microscopic analysis of sludge morphology showed that ultrasound could effectively break down the structure of biological sludge flocs,achiev-ing the separation of sludge flocs and inorganic solid particles.Research has found that,ultrasonic cracking can achieve the separation of organic and inorganic components in sludge,which helps to achieve the recycling and utilization of sludge resources.
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