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