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. 2018 Oct 8;6:464. doi: 10.3389/fchem.2018.00464

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Copyright © 2018 Zhang, Wang, Deng and Jiang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Response surface plots of the interaction effect of different factors on P recovery efficiency (A) pH and Mg/P (B) pH and rotate speed (C) Mg/P and rotate speed.