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Updated: Jul 2, 2026

Laboratory-determined Phosphorus Flux from Lake Sediments as a Measure of Internal Phosphorus Loading
Published on: March 6, 2014
[Distribution of phosphorus fractions and bio-available phosphorus forms and their relationships in sewage sludge]
Chao Wang1, Shi-long Feng, Pei-fang Wang
1State key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China. rltang@hhu.edu.cn
Abstract:
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.
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