Zhu Pei-Ying, Li Da-Peng, Yu Sheng-Nan
School of Environmental Science and Engineering, University of Science and Technology of Suzhou, Suzhou 215009, China.
Huan Jing Ke Xue. 2017 May 8;38(5):1957-1964. doi: 10.13227/j.hjkx.201610120.
The adsorption of external phosphorus (P) and the distribution of dissolved inorganic P (DIP) in the sediment interstitial water and sedimentary P forms were researched under the ignited water purification sludge (IWPS) addition (mixing and capping). The results showed that the adsorption ability of the IWPS increased obviously, compared with the water purification sludge (WPS). It indicated that the increased by 43.7%, the EPC decreased by 69.1% and the DPS decreased by 54.4%. The contribution of P disappearance in the overlying water had almost no difference between the mixing and capping with IWPS, but it was obviously higher than the control in both cases. Under the mixing condition, the adsorption of external P by unit IWPS was 2.3 times of that under the capping condition, if the contacting probability between the IWPS and the overlying water was considered. Under the capping condition, the DIP in the sediment interstitial water (1-2 cm) was 33.17 times (average) of that under the mixing condition. It was attributed to the decrease of the dissolved oxygen penetration due to capping. Under the mixing condition, the external P tended to form Ca-P, while the percentages of NHCl-P and Fe/Al-P to Tot-P were bigger under the capping condition. It was suggested that the improvement of the sedimentary microenvironment by mixing with the IWPS was favorable for the adsorption of the external P and the immobilization of the internal P.
研究了添加（混合和覆盖）灼烧水净化污泥（IWPS）后外部磷（P）的吸附、沉积物间隙水中溶解无机磷（DIP）的分布以及沉积物磷形态。结果表明，与水净化污泥（WPS）相比，IWPS的吸附能力明显提高。结果表明，吸附量增加了43.7%，平衡磷浓度（EPC）降低了69.1%，解吸磷量（DPS）降低了54.4%。IWPS混合和覆盖处理对上覆水中磷消失的贡献几乎没有差异，但在两种情况下均明显高于对照。在混合条件下，若考虑IWPS与上覆水的接触概率，单位IWPS对外部磷的吸附量是覆盖条件下的2.3倍。在覆盖条件下，沉积物间隙水（1-2厘米）中的DIP是混合条件下的33.17倍（平均）。这归因于覆盖导致溶解氧穿透的降低。在混合条件下，外部磷倾向于形成钙磷，而在覆盖条件下，NHCl-P和铁/铝磷占总磷的百分比更大。研究表明，与IWPS混合改善沉积物微环境有利于外部磷的吸附和内部磷的固定。
