Yu Sheng-Nan, Li Yong, Li Da-Peng, Huang Yong
School of Environmental Science and Engineering, University of Science and Technology of Suzhou, Suzhou 215009, China.
Huan Jing Ke Xue. 2017 Sep 8;38(9):3962-3969. doi: 10.13227/j.hjkx.201612271.
The cumulative adsorption of external phosphorus (P) by water purification sludge after ignition under different addition methods (mix and cover) was investigated along with the adsorption isotherm and the release of internal P after external P adsorption. The cumulative adsorption of external P was 11.496 mg (mix) and 11.042 mg (cover) and these values were higher than those in the control (7.219 mg). The maximum sorption capacity () increased under the mix and cover and the former (7.795 mg·g) was higher than the latter (6.807 mg·g). However, the zero equilibrium P concentration (EPC) in the mix was 0.83 mg·L, higher that in the cover (0.64 mg·L). The result suggests that the internal P was easily released in the mix method, compared to the cover method. Under anaerobic conditions, the release of the internal P was 0.93 mg in the mix, lower than that in the cover (1.49 mg) and in the control (7.76 mg). In addition, the specific release rate in the cover method was 0.00614 (mean), higher than that (0.00396) in the mix method. Noticeably, these data were lower than those in the control, indicating that the retention of P under the mix method was higher, compared to the cover and the control and it is challenging to evaluate the P retention with EPC.
研究了不同添加方式（混合和覆盖）下点火后净水污泥对外部磷（P）的累积吸附情况，以及吸附等温线和外部磷吸附后内部磷的释放情况。外部磷的累积吸附量在混合方式下为11.496mg，覆盖方式下为11.042mg，这些值均高于对照（7.219mg）。混合和覆盖方式下的最大吸附容量（）均有所增加，且前者（7.795mg·g）高于后者（6.807mg·g）。然而，混合方式下的零平衡磷浓度（EPC）为0.83mg·L，高于覆盖方式下的（0.64mg·L）。结果表明，与覆盖方式相比，混合方式下内部磷更容易释放。在厌氧条件下，混合方式下内部磷的释放量为0.93mg，低于覆盖方式下的（1.49mg）和对照下的（7.76mg）。此外，覆盖方式下的比释放率为0.00614（平均值），高于混合方式下的（0.00396）。值得注意的是，这些数据均低于对照下的数据，表明与覆盖方式和对照相比，混合方式下对磷的保留率更高，并且用EPC评估磷的保留具有挑战性。
