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Effect of circulation and aeration on wastewater treatment by floating aquatic plants

机译：循环和曝气对漂浮水生植物废水处理的影响

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Laboratory tests were performed in order to examine growth characteristics of floating plants in the presence of urban sewage. The aquatic plants selected for this study included Eichhornia crassipes (water hyacinth), Pistia stratiotes (water lettuce) and Salvinia natans (floating fern). Circulation and aeration of the pre-settled sewage enhanced the kinetics of the process, as compared to the control systems. However prolonged application of circulation or aeration may have a different effect. It is shown that in the presence of Eichhornia and Pistia plants, that are supplemented with circulation or aeration, the local standards of biochemical oxygen demand (BOD) -20 mg L~(-1) and chemical oxygen demand (COD) -70 mg L~(-1) were reached after 2 and 4.5 days of treatment, while 7-8 days were required to this end without circulation or aeration. Aeration and circulation (without plants) enhanced the ammonium removal capacity from 30.4 to 66.5%, in the control, up to 93.4-100%. In the presence of aquatic plants, aeration and circulation, there was additional 5-35% decrease in the water quality indicators. In this context, the best results were obtained when the action of Eichhornia crassipes and Pistia stratiotes plants, was combined with that of aeration and circulation. In contrast to common practice, the kinetic of BOD COD and turbidity reduction was found to follow a second order, rather than first-order modified reaction model. The new results can be used for design calculations regarding expected removal of pollutants by aquatic floating plants.
机译：为了检查在城市污水存在下的漂浮植物的生长特性，进行了实验室测试。本研究选择的水生植物包括凤眼凤梨（Eichhornia crassipes）（水葫芦），水浮萍（Pistia stratiotes）（水莴苣）和丹参（Salvinia natans）（浮蕨）。与控制系统相比，预结算污水的循环和曝气增强了过程的动力学。但是，长时间使用循环或通风可能会产生不同的效果。结果表明，在凤眼菊科植物和雌蕊植物的补充或循环通气条件下，生化需氧量（BOD）-20 mg L〜（-1）和化学需氧量（COD）-70 mg处理2天和4.5天后达到L〜（-1），而为此目的需要7-8天而不循环或充气。曝气和循环（不带植物）将铵的去除量从30.4提高到66.5％，在对照中提高到93.4-100％。在有水生植物，通气和循环的情况下，水质指标又下降了5-35％。在这种情况下，将凤眼莲和水浮萍层系植物的作用与通气和循环作用相结合可获得最佳结果。与通常的做法相反，发现BOD COD的动力学和浊度降低遵循第二阶，而不是第一阶修改的反应模型。新结果可用于有关水生漂浮植物预期污染物去除的设计计算。

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