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Evaluation of Organic Matter Removal Efficiency and Microbial Enzyme Activity in Vertical-Flow Constructed Wetland Systems

机译：垂直流人工湿地系统中有机物去除效率和微生物酶活性的评价

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In this study, enzyme activities and their relationships to organics purification were investigated in three different vertical flow constructed wetlands, namely system A (planting Pennisetum sinese Roxb ), system B (planting Pennisetum purpureum Schum. ), and system C (no plant). These three wetland systems were fed with simulation domestic sewage at an influent flow rate of 20 cm/day. The results showed that the final removal efficiency of Chemical Oxygen Demand (COD) in these three systems was 87%, 85% and 63%, respectively. Planting Pennisetum sinese Roxb and Pennisetum purpureum Schum. could improve the amount of adsorption and interception for organic matter in the substrate, and the amount of interception of organic matter in planting the Pennisetum sinese Roxb system was higher than that in planting the Pennisetum purpureum Schum. system. The activities of enzymes (urease, phosphatase and cellulase) in systems A and B were higher than those in system C, and these enzyme activities in the top layer (0–30 cm) were significantly higher than in the other layers. The correlations between the activities of urease, phosphatase, cellulase and the COD removal rates were R = 0.815, 0.961 and 0.973, respectively. It suggests that using Pennisetum sinese Roxb and Pennisetum purpureum Schum. as wetland plants could promote organics removal, and the activities of urease, phosphatase and cellulase in those three systems were important indicators for COD purification from wastewater. In addition, 0–30 cm was the main function layer. This study could provide a theoretical basis for COD removal in the wetland system and supply new plant materials for selection.
机译：在这项研究中，在三个不同的垂直流动人工湿地中研究了酶活性及其与有机物净化的关系，这三个湿地分别是系统A（种植Pennissetum sinese Roxb），系统B（种植Pennisetum purpureum Schum。）和系统C（无植物）。这三个湿地系统以20厘米/天的进水流量注入模拟生活污水。结果表明，这三个系统中最终化学需氧量（COD）的去除效率分别为87％，85％和63％。种植狼尾草Roxb和狼尾草Purmureum Schum。可以提高底物对有机质的吸附和截留量，种植Pennisetum sinese Roxb系统的有机物截留量要高于植草Penxsetum purpureum Schum。系统。系统A和B中的酶（脲酶，磷酸酶和纤维素酶）的活性高于系统C中的酶，并且顶层（0–30 cm）中的这些酶活性显着高于其他层。脲酶，磷酸酶，纤维素酶的活性与COD去除率之间的相关性分别为R = 0.815、0.961和0.973。提示使用狼尾草Roxb和紫草狼尾草。因为湿地植物可以促进有机物的去除，这三个系统中的脲酶，磷酸酶和纤维素酶的活性是从废水中纯化COD的重要指标。另外，0-30 cm是主要功能层。这项研究可以为湿地系统中COD的去除提供理论依据，并提供新的植物材料供选择。

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