Mello D, Carvalho K Q, Passig F H, Freire F B, Borges A C, Lima M X, Marcelino G R
a Environmental Sciences and Technology Graduate Program. St. Deputado Heitor de Alencar Furtado , Federal University of Technology , Curitiba , Brazil.
b Civil Construction Academic Department. St. Deputado Heitor de Alencar Furtado , Federal University of Technology , Curitiba , Brazil.
Environ Technol. 2019 Jan;40(1):11-18. doi: 10.1080/09593330.2017.1377291. Epub 2017 Sep 20.
The role of Eichhornia crassipes for removing pollutants from low strength sewage was evaluated in three pilot-scale constructed wetlands (CW): CW 1, planted with E. crassipes in a filter media; CW 2, unplanted, composed by filter media; and CW 3, composed by E. crassipes floating on the sewage. The operation was divided into three stages by varying the nominal hydraulic retention time into: (I) 24 h; (II) 48 h; (III) 72 h. Temporal sampling profiles were carried out with collection of the influent and effluent samples to determine temperature, pH, chemical oxygen demand (COD), TKN and TP. Contents of TP and TN were analyzed in the plant tissue of the macrophyte. The best removal efficiency rates for phosphorus (38%) and TKN (47%) were obtained in CW 3 for 72 h. The highest COD removal was observed in the CW 2 (80%) for 48 h. The macrophyte E. crassipes contributed to the absorption process with uptake rate percentages of 8.3% (CW 1) and 9.0% (CW 3) for TN and 0.78% (CW 1) and 1.56% (CW 3) for TP on the dry matter of the plant. The chosen species planted in the systems contributed to the achievement of higher nutrient removal.
在三个中试规模的人工湿地（CW）中评估了凤眼莲对低强度污水中污染物的去除作用：CW 1，在过滤介质中种植凤眼莲；CW 2，未种植植物，由过滤介质组成；CW 3，由漂浮在污水上的凤眼莲组成。通过将名义水力停留时间变化分为三个阶段：（I）24小时；（II）48小时；（III）72小时。进行了时间采样，收集进水和出水样本以测定温度、pH值、化学需氧量（COD）、总凯氏氮（TKN）和总磷（TP）。分析了大型植物的植物组织中的总磷和总氮含量。在CW 3中72小时时获得了最佳的磷去除效率（38%）和总凯氏氮去除效率（47%）。在CW 2中48小时时观察到最高的化学需氧量去除率（80%）。大型植物凤眼莲对吸收过程有贡献，植物干物质上总氮的吸收速率百分比分别为8.3%（CW 1）和9.0%（CW 3），总磷的吸收速率百分比分别为0.78%（CW 1）和1.56%（CW 3）。系统中种植的选定物种有助于实现更高的养分去除。
