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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
- Source :
- Marine Pollution Bulletin, Marine Pollution Bulletin, Elsevier, 2018, 131 (A), pp.142-150. ⟨10.1016/j.marpolbul.2018.04.013⟩
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- International audience; 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.
- Subjects :
- China
Salinity
Urease
Nitrogen
[SDV]Life Sciences [q-bio]
0208 environmental biotechnology
Aquaculture
02 engineering and technology
Chenopodiaceae
Wastewater
010501 environmental sciences
Aquatic Science
Oceanography
Nutrients removal
Waste Disposal, Fluid
01 natural sciences
Water Purification
Nutrient
Ammonia
Enzyme activity
Mariculture wastewater
0105 earth and related environmental sciences
Salicomia bigelovii
Principal Component Analysis
biology
Chemistry
Salicornia bigelovii
Plants
biology.organism_classification
Pollution
6. Clean water
Enzyme assay
Constructed wetland
Enzymes
020801 environmental engineering
Wetlands
Environmental chemistry
[SDE]Environmental Sciences
biology.protein
Microcosm
Subjects
Details
- ISSN :
- 0025326X
- Volume :
- 131
- Database :
- OpenAIRE
- Journal :
- Marine Pollution Bulletin
- Accession number :
- edsair.doi.dedup.....5d7cfbdd2318182fd95aac52d45fc068