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.
污泥生物淋滤过程中磷形态的分布及相间迁移转化
- Title:
- Phosphorus Form Distribution and Interphase Migration and Transformation during Sludge Bioleaching
- Keywords:
- bioleaching; excess sludge; phosphorus release; bioavailable phosphorus; migration and transformation
- 摘要:
- 利用SMT法分析了生物淋滤过程中剩余污泥固相、液相和胞外聚合物（EPS）中磷形态及分布。结果表明，采用生物淋滤法处理5 d后，可利用磷占比从29.0%上升至80.5%，液相总磷（TDP）含量比对照组提高了6.54 mg/g，生物有效磷（BAP）占固相总磷（TSP）的比例从28.6%上升至70.2%，释磷的同时提高了污泥的可生物利用性；正磷酸盐含量显著增加，占TDP的96.9%，有利于后期磷的回收利用。磷的迁移转化分为吸收和释放两个阶段，在吸收阶段，磷从液相和EPS中向固相迁移，优势形态从羟基磷灰石磷（AP）转化为有机磷（OP）；在释放阶段，磷从固相向EPS和液相中迁移，其优势形态转化为正磷酸盐。最佳的释磷效果发生在没有调控酸碱度的对照组。Ca、Mg、Fe的测定结果表明，钙磷和铁磷是污泥液相磷的主要磷源。
- 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.
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