污泥中磷的形态与生物可利用磷的分布及相互关系

应用SMT法(The Standards, Measurements and Testing Programmed)对南京市江心洲污水处理厂不同处理阶段污泥中磷的形态进行了分析,揭示了污泥中生物有效磷的可利用性和迁移性.结果表明,污泥中的磷主要以无机磷(IP)的形态存在,占总磷(TP)的61%以上;有机磷(OP)含量较低,仅为15%-35%;而在无机磷中,非磷灰石无机磷(NAIP)是主要的赋存形态,占IP的60%以上.这表明污泥中的磷具有较高的潜在生物可利用性. TP与NAIP OP呈极显著的正相关关系(R2=0.9607, p<0.01),表明在不具备磷形态分析的情况下,可以通过TP的测定来预测污泥中磷的潜在生物有效性.污泥的理化性质和磷形态含量的相关分析表明,有机质和pH是污泥理化性质中的重要指标,对污泥中磷的潜在环境行为具有重要影响.

Distribution of Phosphorus Fractions and Bio-available Phosphorus Forms and Their Relationships in Sewage Sludge

To investigate the potential bioavailability and mobility of phosphorus (P) in sewage sludge, the Standards, Measurements and Testing (SMT) programme was employed to characterize the distribution of P in sewage sludge from different treatment stage of Jiangxinzhou WWTP. The results showed that the inorganic phosphorus (IP), accounting for 61%, was the predominant fraction of total phosphorus (TP), while the organic phosphorus (OP) in TP was only 15% to 35%. And the IP mainly distributed in the non-apatite inorganic phosphorus (NAIP) fraction, accounting for more than 60%. It suggested the high potential bioavailability and mobility of P in sewage sludge. The significant positive correlations between the contents of TP and the NAIP+OP indicated that the determination of TP could be used to estimate the potential bioavailability of P in sewage sludge. The correlations between the P fractions and the physical-chemical characteristics suggested that the LOI and pH would influence significantly on the potential mobility of P in sewage sludge.