匍匐翦股颖草坪根系对城市生活污水的净化效应

Effects of the root system of Agrostis stolonifera on the decontamination of municipal domestic wastewater

针对匍匐翦股颖草坪根系对生活污水的净化效应进行了初步的探索,结果表明,城市生活污水能显著促进匍匐翦股颖地上部分叶片的生长,其叶片生长量随着其处理的进程而逐渐增加,至第6周时叶片生长量比净水灌溉的对照增加了75.6%;根系生长在污水灌溉与净水灌溉之间未显示出明显的差异;匍匐翦股颖草坪根系对生活污水中总氮(TN)、总磷(TP)、化学耗氧量(CODCr)的去除率分别达到了71.0%、53.1%、82.8%,而无草坪的裸土对TN、TP、CODCr的去除率只有24.6%、13.0%、44.2%。结果显示了匍匐翦股颖草坪根系对生活污水有着较好的净化效果,有望在城市生活污水处理中应用。

As the rapid urbanization and density of residents in urban areas increases, untreated domestic wastewater is becoming one of the main sources of contamination for river systems in China. The major pollutants in domestic wastewater are organic wastes and minerals, both of which can be utilized by plants. The expansion of urban turfgrass areas, make it possible for in situ treatment of wastewater within urban ecosystems. In this paper, we report the primary results of pollutant removal in wastewater using the Agrostis stolonifera root system. The results showed that the shoot growth of the turfgrass was stimulated by wastewater irrigation. Furthermore, leaf growth rate increased under the wastewater irrigation treatment and shoot fresh weight increased by 75.6 % after 6 weeks of treatment compared with that shown for the pure water control treatment. However, the wastewater treatment did not show any significant effects on root growth. The removal rates of TN, TP, and CODCr in the turfgrass root system reached as high as 71.0 %, 53.1 %, and 82.8 %, respectively, whilst that in the non-turfgrass soil system were only 24.6%, 13.0%, and 44.2%,respectively,The results indicated that creeping bentgrass root systems had good decontaminating effects on domestic wastewater and therefore may be suitable to be used in urban household wastewater treatment.