Nutrients removal and substrate enzyme activities in vertical subsurface flow constructed wetlands for mariculture wastewater treatment: Effects of ammonia nitrogen loading rates and salinity levels

Abstract : This study aims to investigate the effects of ammonia nitrogen loading rates and salinity levels on nutrients removal rates and substrate enzyme activities of constructed wetland (CW) microcosms planted with Salicornia bigelovii treating mariculture wastewater. Activities of urease (UA), dehydrogenase (DA), protease (PrA) and phosphatase (PA) were considered. Using principal component analysis (PCA), nutrient removal index (NRI) and enzyme activity index (EM) were developed to evaluate the effects. The results revealed that increasing ammonia nitrogen loading rates had positive effects on nitrogen removal rates (i.e. NH4-N and DIN) and enhanced substrate enzyme activities. Compared with low salinity (i.e. 15 and 22), high salinity levels (i.e. 29 and 36) enhanced nutrients removal rates, DA and UA, but weaken PA and PrA. In conclusion, CW microcosms with Salicornia bigelovii can be used for the removal of nutrients under a range of ammonia nitrogen loadings and high salinity levels.
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https://hal.umontpellier.fr/hal-02002358
Contributeur : Isabelle Vidal Ayouba <>
Soumis le : jeudi 31 janvier 2019 - 16:05:06
Dernière modification le : vendredi 2 août 2019 - 11:04:04

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  • HAL Id : hal-02002358, version 1

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Meng Li, Zhenlin Liang, Myriam D. Callier, Emmanuelle Roque d'Orbcastel, Guoxiang Sun, et al.. Nutrients removal and substrate enzyme activities in vertical subsurface flow constructed wetlands for mariculture wastewater treatment: Effects of ammonia nitrogen loading rates and salinity levels. Marine Pollution Bulletin, Elsevier, 2018, 131 (A), pp.142-150. ⟨hal-02002358⟩

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