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

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), dehydrogena...

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Bibliographic Details
Published in:Marine pollution bulletin 2018-06, Vol.131 (Pt A), p.142-150
Main Authors: Li, Meng, Liang, Zhenlin, Callier, Myriam D., Roque d'orbcastel, Emmanuelle, Sun, Guoxiang, Ma, Xiaona, Li, Xian, Wang, Shunkui, Liu, Ying, Song, Xiefa
Format: Article
Language:English
Subjects:
Ammonia
Ammonia - analysis
Aquaculture
Artificial wetlands
Chenopodiaceae
China
Constructed wetland
Environmental Sciences
Enzymatic activity
Enzyme activity
Enzymes
Enzymes - metabolism
Life Sciences
Mariculture wastewater
Marine aquaculture
Microcosms
Mineral nutrients
Nitrogen
Nitrogen - analysis
Nitrogen - metabolism
Nitrogen removal
Nutrient removal
Nutrients
Nutrients removal
Phosphatase
Plants
Principal Component Analysis
Principal components analysis
Removal
Salicornia bigelovii
Salinity
Salinity effects
Storm seepage
Substrates
Urease
Waste Disposal, Fluid - instrumentation
Waste Disposal, Fluid - methods
Waste Water - analysis
Waste Water - chemistry
Wastewater
Wastewater treatment
Water Purification - instrumentation
Water treatment
Wetlands
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Summary: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 (EAI) 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. •Both nutrients removal and substrate enzyme activities of marine CWs were evaluated.•High ammonia nitrogen loading gave high N removal rates and enzyme activities.•High salinities, i.e. 29 and 36, enhanced nutrients removal rates and activities of dehydrogenase and urease.
ISSN:0025-326X
1879-3363
DOI:10.1016/j.marpolbul.2018.04.013