JI Sha-sha,HUANG Jin.Phosphorus Forms Distribution and Migration in Sludge Incineration Project[J].China Water & Wastewater,2021,37(5 5):26-30.
Phosphorus Forms Distribution and Migration in Sludge Incineration Project
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
5 5
Page:
26-30
Column:
Date of publication:
2021-03-01
- Keywords:
- sludge; incineration; form of phosphorus
- Abstract:
- Based on Zhuyuan sludge incineration project, contents and forms of phosphorus in dry sludge, slag and fly ash were explored by using SMT method. The total phosphorus (TP) contents in slag and fly ash were 2 to 3 times higher than that in dry sludge, and the inorganic phosphorus (IP) contents in slag and fly ash were increased to more than 99% of the total TP. Therefore, the phosphorus bioavailability was effectively improved while phosphorus enrichment was realized. The effects of incineration process on apatite inorganic phosphorus (AP) and non-apatite inorganic phosphorus (NAIP) were analyzed. It was found that magnesium and calcium ions reacted with NAIP in sludge, replacing aluminum ion to form calcium-magnesium binding AP. Compared with slag, this transformation trend in fly ash was more obvious because of CaO addition in bags, and the AP surpassed NAIP to become the dominant form, accounting for 78.4% of the total IP. As incineration is the main way of sludge treatment in Shanghai, the above conclusions provide a new idea for resource utilization of fly ash created in sludge incineration from the perspective of nutrient recovery.
Last Update:
2021-03-01