Study on the Purification Effect of Phosphorus in Sewage from Sediments in Coastal Wetland of Yellow River Delta

• 作者: Xueping LI Yanhui FAN
• 来源期刊: 农业生物技术:英文版
• 学科: 地球科学
• 关键词: WETLAND P SEDIMENT Overlying water
• 年，卷（期）: 2020,（1）
• 页码范围: 96-100
• 页数: 5页
• 分类号: P73

摘要

[Objectives] This study was conducted to explore whether the coastal wetlands in the Yellow River Delta have become secondary pollution sources. [Methods] With a coastal reed wetland in the Yellow River Delta as a research object, the SMT method and DGT technology were combined to study the vertical distribution of different forms of phosphorus in the sediment and the distribution characteristics of phosphorus at the sediment-interstitial/overlying water interface of the wetland to clarify the receiving and purification capabilities of wetlands in this region. [Results] The total phosphorus content in the wetland’s water intake area, dense reed area and water outlet area increased with the depth increasing;and the wetland phosphorus accumulated in the deep layer, and the total phosphorus content in the wetland sediments was as high as 936.30 mg/kg. The research on the phosphorus forms in the wetland sediments found that the content of Ca phosphorus was the highest in the wetland sediments, followed by the content of Fe/Al-bonded phosphorus, and the exchangeable phosphorus content was the lowest. The DGT sampling technology was used to investigate the distribution characteristics of phosphorus at wetland sediment-interstitial/overlying water micro-interface. It was found that the concentrations of phosphorus in the overlying water of the water intake area, dense reed area and water outlet area were significantly higher than that in the interstitial water. The wetland pollution level in this research area was high and had an obvious cumulative effect. [Conclusions] The results show that the wetland sediments in this region have a strong ability to retain phosphorus, and can control the migration and transformation of endogenous phosphorus, and the wetland has not become a secondary pollution source.