Environ Technol. 2014 Sep-Oct;35(17-20):2176-82. doi: 10.1080/09593330.2014.896949.
The eutrophication of many rivers and lakes is attributed to the anoxia and the increasing internal loading of nutrients from sediment. A novel sustained-release composite (SRC) synthesis of stearic acid and calcium peroxide (CaO2) was applied to supply a water body with oxygen endured in this study. The influences of SRC on the dissolved oxygen (DO) level, pH and total phosphorus (TP) of an urban river in Shanghai were studied. The results show that SRC has a longer oxygen-releasing cycle and a more tender effect on pH with the comparison of CaO2 powder. Reduction of 79.6% in the concentration of TP was observed in the water column. After 35 days of SRC addition, there was a significant positive correlation between TP and DO. As a consequence, the phosphorus fractions in sediment, including loosely sorbed P (NH4Cl-P), redox-sensitive P (Fe-P), calcium bound P (Ca-P), aluminium bound P (Al-P) and residual P (organic and refractory P) were affected by the addition of SRC. The NH4Cl-P and Fe-P fractions in the sediment that could release P easily were well constrained under the positive effect of SRC.
许多河流和湖泊的富营养化归因于缺氧以及来自沉积物的营养物质内部负荷的增加。本研究应用新型缓释复合（SRC）合成硬脂酸和过氧化钙（CaO2），为水体提供持久的氧气。研究了 SRC 对上海一条城市河流溶解氧（DO）水平、pH 值和总磷（TP）的影响。结果表明，与 CaO2 粉末相比，SRC 具有更长的释氧周期和对 pH 值更温和的作用。在水柱中观察到 TP 浓度降低了 79.6%。SRC 添加 35 天后，TP 和 DO 之间存在显著的正相关关系。因此，SRC 的添加影响了沉积物中的磷分，包括松动结合磷（NH4Cl-P）、氧化还原敏感磷（Fe-P）、钙结合磷（Ca-P）、铝结合磷（Al-P）和残余磷（有机和难处理磷）。在 SRC 的积极作用下，很容易释放磷的 NH4Cl-P 和 Fe-P 分得到了很好的控制。
