组合骨料型百喜草植生混凝土去除氮磷

Nitrogen and phosphorus elimination by composited aggregate Bahia grass-planting concrete

以6组90 d龄期的组合骨料型百喜草植生混凝土盆栽为研究对象,用配制溶液静态培养的方法,选择氨氮（NH3-N）、总氮（TN）和总磷（TP）为主要指标,考查沸石与钢渣、沸石与浮石两种组合骨料型的植生混凝土对污染物的去除效果。结果表明,各组NH3-N 1 d、7 d的去除率分别为13.0%-16.9%和45.7%-56.7%,1 d去除率约占7 d的30%。各组TN 1 d、7 d的去除率分别为9.0%-14.1%和25.6%-39.2%,1 d去除率约占7 d的30%。各组TP 1 d、7 d的去除率分别为22.0%-33.3%和57.3%-89.3%,1 d去除率约占7 d的40%。NO3^--N、NO-2-N含量很低,NO3^--N浓度基本在0.50 mg/L以下,NO-2-N浓度变化范围在0.10 mg/L以下。综合NH3-N、TN和TP去除效果,沸石与浮石按1∶1-1∶3混合的百喜草植生混凝土具有良好的脱氮除磷效果。

An experiment was conducted on six groups of composited aggregate planting concrete,in which Paspalum Notatum Flugge（ Bahia Grass） was vegetated in pots for 90 days. The impact of composited aggregate zeolite-steel slag and zeolite-pumice on the efficacy of removal of contaminants based on NH3-N,TN,and TP was investigated under static cultivation conditions. The results showed that the removal rate of NH3-N was from13. 0% to 16. 9% after 1 d,approximately 30% of that after 7 d（ from 45. 7% to 56. 7%）. The removal rate of TN was from 9. 0% to 14. 1% after 1 d,approximately 30% of that after 7 d（ from 25. 6% to 39. 2%）. The removal rate of TP was from 22. 0% to 33. 3% after 1 d,approximately 40% of that after 7 d（ from 57. 3% to89. 3%）. The concentrations of NO3^--N and NO-2-N were low. The concentration of NO3^--N was below 0. 50 mg /L,and that of NO-2-N was below 0. 10 mg / L. Considering the removal rates of NH3-N,TN,and TP,we state that zeolite mixed with pumice at a ratio of 1∶ 1 to 1∶ 3 increased the efficacy of removal of nitrogen and phosphorus by composited aggregate Bahia grass-planting concrete.