再生水灌溉高羊茅全盐量和余氯的上限

Upper Limits of Total Soluble Solids and Residual Chlorine of Reclaimed Wastewater Irrigation for Festuca Arundinacea

灌溉绿地是再生水回用的重要途径之一.但对于再生水灌溉绿地,我国目前尚无针对性强的水质控制标准.通过对天津地区常用景观草坪草——高羊茅的水培实验和盆栽实验,得出灌溉高羊茅时再生水中全盐量和余氟这2个关键指标的上限.结果表明,再生水全盐量和余氯对高羊茅生长有负面影响.随着全盐量和余氯浓度的增加,高羊茅的生物量、光合速率和叶绿素总量均有不同程度降低；过氧化氢酶活性低浓度上升,高浓度下降.统计分析后,上述指标应达到全盐量小于1900mg/L,余氯小于1.0mg/L.

Landscape irrigation is an important aspect of reclaimed wastewater reuse. However, guidelines and standards aiming at reclaimed wastewater quality for landscape irrigation have not been promulgated in China. Upper limits of two important indexes of reclaimed wastewater for landscape irrigation, which are total soluble solids （TDS） and residual chlorine, were acquired by hydroponics and potted experiments of Festuca arundinacea, which is usually used in Tianjin, China. The results showed that growth of Festuca arundinacea was adversely affected by TDS and residual chlorine. Biomass, photosynthetic rate and total content of chlorophyll of Festuca arundinacea reduced in varying extents with increasing concentrations of TDS and residual chlorine of reclaimed wastewater. Activity of catalase （CAT） went up under low concentrations and decreased under high densities. Based on statistic analysis, two key indexes of reclaimed wastewater irrigation for Festuca arundinacea should be met to following positions： TDS 〈 1 900 mg/L; residual chlorine 〈 1.0 mg/L.