原位化学处理对沉积物-水系统氮磷影响研究

发布时间：2018-06-03 03:06

本文选题：原位处理 + 沉积物　；参考：《环境科学与技术》2016年S2期

【摘要】：为研究原位处理技术对沉积物-水系统中氮磷元素的影响,采用了硝酸钙、硫酸铝、硫酸铁和锁磷剂4种原位处理剂处理底泥,测定了沉积物-水系统中氮磷的形态和含量。结果表明:4种原位处理剂都使间隙水中总磷和溶解性磷浓度显著降低;硫酸铝使上覆水中总磷和溶解性磷浓度降低,硝酸钙使上覆水中磷含量升高;4种处理剂对沉积物中磷形态变化影响显著,硝酸钙使松散态磷和氧化还原敏感磷含量升高,硫酸铝和硫酸铁分别增加了金属氧化物结合磷和氧化还原敏感磷含量,锁磷剂使较易释放的磷转变为较稳定的形态;硫酸铁和硫酸铝的使用使上覆水中pH降低,这几种处理剂都会使沉积物-水系统中氨氮和总氮含量有所升高。综合以上结果,硫酸铝原位处理效果最好,锁磷剂可降低沉积物中磷释放的风险,但只有在剂量足够时,才具有去除上覆水中磷的能力。
[Abstract]:In order to study the effect of in-situ treatment on nitrogen and phosphorus in sediment-water system, calcium nitrate, aluminum sulfate, ferric sulfate and phosphorus-locking agent were used to treat sediment. The forms and contents of nitrogen and phosphorus in sediment water system were determined. The results showed that the concentrations of total phosphorus and dissolved phosphorus in interstitial water were significantly decreased by in situ treatment of%, and the concentrations of total phosphorus and dissolved phosphorus in overlying water were decreased by aluminum sulfate. The phosphorus content in overlying water was increased by calcium nitrate. Four treatments had a significant effect on the change of phosphorus forms in sediments. Calcium nitrate increased the contents of loose phosphorus and redox sensitive phosphorus. Aluminum sulfate and ferric sulfate increased the content of metal oxide bound phosphorus and redox sensitive phosphorus respectively, and phosphorus locking agent changed the easily released phosphorus into a more stable form, while the use of ferric sulfate and aluminum sulfate reduced the pH of the overlying water. These treatments can increase ammonia nitrogen and total nitrogen content in sediment-water system. Combined with the above results, aluminum sulfate in situ treatment is the best, phosphorus locking agent can reduce the risk of phosphorus release in sediment, but only when the dosage is sufficient, can remove phosphorus from overlying water.
【作者单位】：中国科学院水生生物研究所;杭州市市区河道监管中心;
【基金】：杭州市重大科技创新项目(20131813A04) 住房和城乡建设部科学技术项目(2014-K7-014)
【分类号】：X524

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