Effects of monocot and dicot types and species richness in mesocosm constructed wetlands on removal of pollutants from wastewater

School of Life Sciences, Taizhou University, Linhai 317000, PR China.
Bioresource Technology (Impact Factor: 4.49). 08/2011; 102(22):10260-5. DOI: 10.1016/j.biortech.2011.08.081
Source: PubMed


The effects of planting type and species richness on removal of BOD5, COD, nitrogen and phosphorus were studied in mesocosms with monocot alone (M), dicot alone (D) and mixed planting of M+D, where each planting type had four species richness levels. Above- and below-ground plant biomasses increased with the M and M+D species richness as shown by one-way ANOVA. The M+D type had the highest above-ground biomass, whereas the M type had the highest below-ground biomass among planting types. Carbon, nitrogen and phosphorus in the microbial biomass increased with the richness of the M and M+D type. Removals of BOD5, COD, inorganic P and total P did not change with the richness, but removals of NH4-N, NO3-N increased. Planting type impacted only removal of inorganic P, with higher removal of inorganic P in the M type.

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Available from: Jie Chang, Sep 29, 2015
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    • "Because of the difference in both root exudates and oxygen release level, aquatic species may be different in microbial composition and activity on biofilm of root or rhizome surfaces (Li et al., 2012). On the other hand, plant species also show a great difference in nutrient assimilation rate due to the dissimilarity in their anatomical and physiological properties such as transpiration power, roots and photosynthetic rate (Zhang et al., 2011). Therefore, CFI systems vegetated with different aquatic species may show a great difference in the removal performance of pollutants. "
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    ABSTRACT: This study focused on a comparison of the role that plant and biofilm bacterial community parameters played in mediating removals of pollutants in the floating island microcosms mono-cultured with different macrophytes. The greater removals of BOD5, COD, total phosphorus and NH4–N were observed in floating microcosms planted with Alternanthera philoxeroides or Cyperus alternifolius, respectively. The microcosms planted with Scirpus validus exhibited the greatest removals of total nitrogen, and those planted with Canna generalis showed a great removal of NO3–N. The above-ground biomass was positively related to the removal of the NO3–N, while the translocation factor for nitrogen was positively related to total nitrogen and phosphorus, the translocation factor for phosphorus was positively related to the removals of total phosphorus and NO3–N, respectively. Nevertheless, bacterial community parameters such as the ribotype number and diversity index were not correlated with the removals of pollutants.
    Ecological Engineering 12/2014; 73:58–63. DOI:10.1016/j.ecoleng.2014.09.023 · 2.58 Impact Factor
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    • "Once the effluent samples were completed, plant samples from each microcosm were immediately collected. Aboveground and belowground plant samples were collected using a harvesting method (Zhang et al., 2011). "
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    ABSTRACT: Previous studies have shown that plant diversity can improve the wastewater purification efficiency of constructed wetlands (CWs), but its effect on the nitrous oxide (N2O) emission in CWs has been unknown. To investigate the effect of plant diversity on the N2O emission, we established four plant species richness levels (each level containing 1, 2, 3 and 4 species, respectively) by using 96 hydroponic microcosms. Results showed that plant species richness enhanced the N2O emission, ranging from 27.1 to 115.4 μg N2O m−2 d−1, and improved nitrate removal (P < 0.001). The presence of Phalaris arundinacea within a given plant community increased the N2O emission (P < 0.001). The presence of Rumex japonicas had no influence on the N2O emissions (P > 0.05), but improved nitrogen removal (P < 0.001). Hence, our study highlights the importance of both plant species richness and species identity in mediating the N2O emission and nitrogen removal in CWs.
    Atmospheric Environment 05/2013; 77:544-547. DOI:10.1016/j.atmosenv.2013.05.058 · 3.28 Impact Factor
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    • "C.-B. Zhang et al. / Atmospheric Environment 62 (2012) 180e183 181 species richness, as shown by the linear regression analysis (r 2 ¼ 0.108, P ¼ 0.023, Fig. 2A). Our results further supported the previous reports in which the APB increased with the plant species richness in CW systems (Zhang et al., 2011). The positive diversitye productivity relationship was most likely attributed to the complementary usage of plants for nutrients in the diverse species communities (van Ruijven and Berendse, 2003). "
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    ABSTRACT: Effect of plant species richness on the methane (CH4) flux was investigated in vertical flow microcosms fed with the modified Hoagland solution. The CH4 flux increased significantly with the plant species richness (Linear regression analysis, r(2) = 0.203, P = 0.010), with an average range from 1.59 to 4.30 mg m(-2) d(-1). Above-ground plant biomass followed the CH4 flux trend with the plant species richness (r(2) = 0.108, P = 0.023), but both methanogenic number and activity decreased to different extents with the plant species richness (r(2) = 0.103, P = 0.023; r(2) = 0.020, P = 0337), respectively. Accordingly, the present study highlights the significance of plant species diversity and its biomass production in manipulating the CH4 flux in the constructed wetlands.
    Atmospheric Environment 12/2012; DOI:10.1016/j.atmosenv.2012.08.034 · 3.28 Impact Factor
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