钢渣-龙须菜系统处理富营养化海水的研究

分别研究了钢渣、龙须菜和钢渣-龙须菜等系统对富营养化海水中硝酸盐、磷酸盐的去除效果,探讨了利用钢渣-龙须菜系统处理富营养化海水的可行性.结果表明,钢渣可有效去除富营养化海水中的磷酸盐,不能去除海水中的硝酸盐.起始密度为3g/L的龙须菜对轻度富营养化海水(硝酸盐:0.3~0.6mg/L,磷酸盐:0.05~0.1mg/L)中硝酸盐、磷酸盐的去除率较高,但是对重度富营养化海水(硝酸盐:4.8mg/L,磷酸盐:0.8mg/L)中硝酸盐、磷酸盐的去除率较低.钢渣-龙须菜系统将钢渣对磷酸盐的物理吸附、化学沉淀与龙须菜对硝酸盐、磷酸盐的生物吸收结合起来,能够显著降低富营养化海水中硝酸盐、磷酸盐的浓度.

Study on treating eutrophic seawater with "steel slag-Gracilaria lemaneiformis" system

Eutrophic seawater was treated with steel slag, Gracilaria lemaneiformis, and ‘steel slag-Gracilaria lemaneiformis’ system, respectively, and the feasibility of using steel slag for eutrophic seawater treatment was discussed. The results showed that, most phosphorus in the eutrophic seawater was removed by steel slag, while steel slag had no significant effect on nitrogen removement. When Gracilaria lemaneiformis with an initial density of 3g/L was used to treat mildly eutrophic seawater, in which concentration of nitrogen and phosphorus was 0.3~0.6mg/L, and 0.05~0.1mg/L, respectively, the removal rate of nitrogen and phosphorus is high. However, a low-removal rate of nitrogen and phosphorus was found in seriously eutrophic seawater (concentration of nitrogen was 4.8mg/L, and level of phosphorus was 0.8mg/L) treatment with Gracilaria lemaneiformis. And the ‘steel slag-Gracilaria lemaneiformis’ system obviously reduced nitrogen and phosphorus levels in eutrophic seawater, due to pthehysical adsorption and chemical precipitation of phosphorus by steel slag and the biological uptake of phosphorus and nitrogen by Gracilaria lemaneiformis.