沸石和麦饭石组合滤料对城市降雨径流氮磷去除效率的研究

以7 d为1个周期，分别研究了沸石与麦饭石以3种不同体积比例（5 ∶5，7 ∶3，3 ∶7）组成的填充柱在2个周期的时间里对人工配制的模拟城市降雨径流中氮、磷的去除效率.结果表明，3 ∶7配比的填充柱前后两个阶段对总氮的去除效率分别为78.61%和85.28%，而对磷的去除效率分别可以达到96.73%和94.59%；5 ∶5配比的填充柱前后两个阶段脱氮除磷效率分别为83.18%，80.24%，97.02%和86.16%；7 ∶3配比的脱氮除磷效率分别为92.39%，80.01%，51.79%和57.28%.在兼顾整个填充柱脱氮除磷效率、再生能力以及再生速度等因素的情况下，3 ∶7配比为最优选择.

Efficiencies of different zeolite and medical stone combinations removaling the nitrogen and phosphorus in urban rainfall runoff

One kind of packed columns, which were filled up with three different volume ratios of zeolite and medical stone (5 ∶5, 7 ∶3, 3 ∶7; V ∶V), were used to investigate the efficiency of zeolite and medical stone to removal the nitrogen and phosphorus in synthetic urban rainfall runoff during a 7 days period. The experiments were token twice, and the results showed that 3 ∶7 ratio of packed column could removal 78.61% and 85.28% nitrogen in the first and second phase experiment respectively, and the phosphorus removal rates reached 96.73% and 94.59%; the removal efficiency of nitrogen and phosphorus of 5 ∶5 ratio packed column were 83.18% and 97.02% in the first phase, and 80.24% and 86.16% in the second phase; while in 7 ∶3 ratio packed column, about 92.39% and 80.01% nitrogen and 51.79% and 57.28% phosphorus was removed respectively. It was concluded that in considering the whole removal efficiency and regeneration capability of zeolite and medical stone, the combination of 3 ∶7 ratio was the best choice.