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Environments 2016, 3(4), 26; doi:10.3390/environments3040026

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

1
Department of Resources & Environmental Engineering, Anshun University, Anshun 561000, China
2
College of Natural Resource & Environment, South China Agricultural University, Guangzhou 510642, China
*
Author to whom correspondence should be addressed.
Academic Editor: Yu-Pin Lin
Received: 5 August 2016 / Revised: 18 September 2016 / Accepted: 21 September 2016 / Published: 30 September 2016
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Abstract

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. View Full-Text
Keywords: vertical-flow constructed wetland; organics; Pennisetum sinese Roxb; Pennisetum purpureum Schum.; enzyme activity vertical-flow constructed wetland; organics; Pennisetum sinese Roxb; Pennisetum purpureum Schum.; enzyme activity
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Xu, Q.; Chen, S.; Huang, Z.; Cui, L.; Wang, X. Evaluation of Organic Matter Removal Efficiency and Microbial Enzyme Activity in Vertical-Flow Constructed Wetland Systems. Environments 2016, 3, 26.

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