摘要
在苦土粉、苦土粉与MgCl2联用分别为镁源的条件下,研究二者对模拟废水中氮、磷去除的影响。结果表明,单独使用苦土粉时,苦土粉最佳投加质量为1.0 g,此时,Mg投加浓度为18.75 mmol/L,平衡时间为60 min,氮、磷去除率分别为79.9%,84.0%;然而,苦土粉与MgCl2联用时,苦土粉最佳投加质量为0.8 g和MgCl2最佳投加浓度为3mmol/L,此时,Mg投加浓度为18 mmol/L,平衡时间为40 min,氮、磷去除率分别为87.7%,92.1%。对比分析可知,苦土粉与MgCl2联用时,所用镁较少,反应速率较快,水中氮、磷的去除率显著提高。
The effect on the removal of nitrogen and phosphorus from simulated wastewater was investigated when the magnesia or magnesia and the MgC12 are existing respectively. Results indicated that opimal dose of magnesia was 1.0 g, in this case, the amount of magnesium was 18.75 mmol, the reaction equilibrium time was 60 min,and the removal efficiency of nitrogen and phosphorus were 79.9% and 84.0% respectively when magnesia was used individually. However, the opimal dose of magnesia and the MgC12 was 0.8 g and 3 mmol respectively on the condition that the magnesia and the MgC12 are used simultaneously. At this time, the total dose of magnesia was 18 mmol, the reaction equilibrium time was 40 min, and the removal effciency of nitrogen and phosphorus were 87.7% and 92.1% respectively. The above result suggest that, less magnesium was used and the reaction rate was improved, more importantly the removal efficiency of nitrogen and phosphorus increases significantly considering the combined use of magnesia and MgC12.
出处
《环境科技》
2014年第2期18-22,共5页
Environmental Science and Technology
基金
安徽省高校自然科学研究重点项目(KJ2010A049
KJ2011A047)
关键词
鸟粪石沉淀法
废水
苦土粉
MGCL2
联用
Struvite precipitation method
Wastewaters
magnesia
MgC12
Association
