Journal
BIORESOURCE TECHNOLOGY
Volume 99, Issue 11, Pages 4990-4996Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2007.09.012
Keywords
horizontal subsurface-flow constructed wetlands; vegetation; substrate; dissolved organic matter; Shannon-Wiener Index
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The fate of dissolved organic matter (DOM) during horizontal subsurface-flow constructed wetlands (HSSF CWs) was examined. In several studies it had been demonstrated that factors such as vegetation and substrates type affected the treatment efficiency of DOM, while very few studies discerned their influence on the transformations of DOM. Thus three pilot-scale HSSF CWs, i.e. reed (Phragmites australis)lgravel bed (W1), hybrid vegetation {cattail (Typha latifolia), bulrush (Scirpus validus), reed)/gravel bed (W2) and reed/hybrid substrates bed (gravel, zeolite, slag) (W3), were designed, and were operated continuously to investigate soluble COD (SCOD) removal and DOM transformations affected by vegetation and substrate type, and to explore the correlation between SCOD and biodiversity. The results showed that cattail and bulrush contributed to higher SCOD removal than common reed, and that gravel, zeolite and slag did not show significant influence on SCOD removal. The composition of the dissolved. organic carbon (DOC) could undergo a considerable shift in composition due to metabolism and senescence from plant and microorganism. Nonlabile aromatic hydrocarbons and alkyl hydrocarbons in the effluent were a significant portion compared with labile alcoholic and alkene in the influent. It was also observed that the type of vegetation and substrate had great influence on the structure of bacteria, and the Shannon-Wiener Index increased linearly with the decrease of SCOD concentration along water flow in W2 and W3 (R-2 = 0.96). (C) 2007 Elsevier Ltd. All rights reserved.
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