LUChuang,ZHANGJing,YOUHong-kun,et al.Phosphorus Form Distribution and Interphase Migration and Transformation during Sludge Bioleaching[J].China Water & Wastewater,2024,40(13):86-92.
Phosphorus Form Distribution and Interphase Migration and Transformation during Sludge Bioleaching
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第13期
Page:
86-92
Column:
Date of publication:
2024-07-01
- Keywords:
- bioleaching; excess sludge; phosphorus release; bioavailable phosphorus; migration and transformation
- Abstract:
- The form and distribution of phosphorus in the solid phase, liquid phase, and extracellular polymeric substances (EPS) of excess sludge during bioleaching were analyzed using the SMT method. After 5 days of treatment using the bioleaching method, the proportion of available phosphorus increased from 29.0% to 80.5%. Additionally, the concentration of total dissolved phosphorus (TDP) in the liquid phase showed a significant increase of 6.54 mg/g compared to the control group. Furthermore, there was an observed increase in the proportion of bioavailable phosphorus (BAP) from 28.6% to 70.2%. Phosphorus release also improved the bioavailabilty of sludge. The concentration of orthophosphate experienced a significant increase, representing 96.9% of the TDP. This development was beneficial for the subsequent recovery and utilization of phosphorus. The process of phosphorus migration and transformation could be categorized into two distinct stages: absorption and release. During the stage of phosphorus absorption, there was a migration of phosphorus from the liquid phase and EPS to the solid phase. The dominant form also changed from apatite phosphorus (AP) to organic phosphorus (OP). In the stage of phosphorus release, there was a migration of phosphorus from the solid phase to EPS and the liquid phase, with its dominant form being transformed into orthophosphate. The most effective release of phosphorus was observed in the control group, where pH was not regulated. The analysis of Ca, Mg and Fe indicated that Ca-P and Fe-P were the primary sources of phosphorus in the liquid phase of sludge.
Last Update:
2024-07-01