Biotransformation of phosphorus in enhanced biological phosphorus removal sludge biochar

被引：0
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作者：
Qian, Tingting [1 ,2 ]
Lu, Dan [1 ,2 ]
Soh, Yan Ni Annie [1 ]
Webster, Richard D. [3 ]
Zhou, Yan [1 ,2 ]
机构：
[1] Advanced Environmental Biotechnology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore, 637141, Singapore
[2] School of Civil and Environmental Engineering, Nanyang Technological University, Singapore, 639798, Singapore
[3] Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore
来源：
Water Research | 2020年 / 169卷
关键词：
Biochar derived from enhanced biological phosphorus removal (EBPR) sludge could be a potential phosphorus (P) fertilizer. Soil microorganisms play a regulating role on the turnover of P in soil. When the EBPR sludge biochar is added to soil; it would inevitably interact with soil microorganisms. Thus; for the wise use of the EBPR sludge biochar; it is imperative to understand the interaction between the biochar and soil microorganisms. In this study; Pseudomonas putida (P. putida); a common soil microorganism; was applied to investigate the biotransformation of P in two EBPR sludge biochars. The results reveal that P released from biochar produced at 700 °C (E700) was more easily absorbed by P. putida than that released from biochar produced at 400 °C (E400). This is attributed to the higher polyphosphates (poly-P) content in E700 and poly-P has higher affinity to P. putida surface compared to orthophosphates. Furthermore; E400 has a negative effect on intracellular poly-P formation in P. putida; which is probably caused by the oxidative stress induced by the free radicals from E400. As intracellular poly-P plays a critical role on bacteria survival and their interaction with surrounding environment; high-temperature biochar (E700) in this case would be more suitable for soil remediation. © 2019 Elsevier Ltd;
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