水溶液体系中Ca(OH)_2和FeSO_4的除磷效应

为了解决人工湿地冬季除磷效果减弱的问题,试验选取了Ca(OH)_2和FeSO_4作为辅助除磷试剂,考察了水溶液体系中两者的除磷效应。结果表明:Ca(OH)_2和FeSO_4均具有较好的除磷效果,单独使用时Ca(OH)_2要优于FeSO_4,但单独使用会显著改变体系的p H值,破坏人工湿地的生态环境。采用Ca(OH)_2与FeSO_4的合理配比和先添加Ca(OH)_2再施用FeSO_4的顺序,不仅可极大地提高磷的去除率,还可以有效地调节系统溶液的酸碱度至中性,从而保持人工湿地生态系统的稳定性。本研究结果为强化人工湿地除磷提供了新方案和基础数据。

Phosphorus removal effect with Ca(OH)2 and FeSO4 in aqueous system

In order to enhance the phosphorus removal rate in constructed wetlands in cold seasons,Ca (OH)2 and Fe-SO4 were selected as phosphorus removal reagent,and their effects were investigated. The results showed that Ca (OH)2 and FeSO4 were both effective in removal of phosphorus from aqueous solutions,and in comparison,Ca (OH)2 per-formed better than FeSO4. Individual use of either Ca (OH)2 or FeSO4 caused significant changes in pH of the system.Such changes could lead to destructive impact on ecological environment. Combined use in the order of adding Ca (OH)2 first and then FeSO4 greatly increased the phosphorus removal rates. The optimal ratios of Ca (OH)2 to FeSO4 aimed at high phosphorus removal efficiency and effective adjustment of pH condition for protection of the constructed wetland eco-system were determined for solutions containing different amount of phosphorus. The results obtained from the present study were of significance in providing useful data for improvement of phosphorus removal process in constructed wetlands used as wastewater treatments systems.