Nitrogen removal in constructed wetlands employed to treat domestic wastewater

2000 ◽  
Vol 34 (9) ◽  
pp. 2582-2588 ◽  
Author(s):  
J Huang
Keyword(s):  
Constructed Wetlands ◽  
Nitrogen Removal ◽  
Domestic Wastewater

Comprehensive evaluation of substrates in vertical-flow constructed wetlands for domestic wastewater treatment

2015 ◽  
Vol 10 (3) ◽  
pp. 625-632 ◽  
Author(s):  
Junmei Wu ◽  
Dong Xu ◽  
Feng He ◽  
Jie He ◽  
Zhenbin Wu
Keyword(s):  
Constructed Wetlands ◽  
Nitrogen Removal ◽  
Phosphorus Removal ◽  
Evaluation System ◽  
Comprehensive Evaluation ◽  
Steel Slag ◽  
Domestic Wastewater ◽  
Vertical Flow ◽  
Substrate Selection ◽  
Comprehensive Evaluation System

Substrates are the important component of constructed wetlands (CWs), which have an effect on construction cost, purification capability and stable operation, so that substrate optimization is the key part of CWs design. The comprehensive evaluation system, including four layers, eleven indicators and nine schemes, for substrates in vertical-flow CWs treating domestic wastewater was established based on analytic hierarchy process. Then combined with Delphi method and fuzzy synthetic evaluation approach, zeolite, anthracite, shale, vermiculite, ceramic filter material, gravel, steel slag, bio-ceramic and combination substrate (isopyknic layered anthracite, bio-ceramic and zeolite) were evaluated from the viewpoints of purification effect, practical performance and economic analysis. The results showed that phosphorus removal, nitrogen removal, chemical stability were the main factors of substrate selection. Combination substrate was the best scheme among nine substrates. Zeolite was ideal substrate for nitrogen removal and biocompatibility, while anthracite and steel slag were ideal substrates for phosphorus removal. The comprehensive evaluation system of substrates was beneficial to comprehensive compare all aspects of performance for different substrates, and could be improved according to the actual situation of engineering applications, so as to provide guidance of substrate selection for CWs design.

scholarly journals Nitrogen Removal from Domestic Wastewater and the Development of Tropical Ornamental Plants in Partially Saturated Mesocosm-Scale Constructed Wetlands

2019 ◽  
Vol 16 (23) ◽  
pp. 4800 ◽  
Author(s):  
Carlos Nakase ◽  
Florentina Zurita ◽  
Graciela Nani ◽  
Guillermo Reyes ◽  
Gregorio Fernández-Lambert ◽  
...  
Keyword(s):  
Constructed Wetlands ◽  
Nitrogen Removal ◽  
Ornamental Plants ◽  
High Growth ◽  
Domestic Wastewater ◽  
High Growth Rate ◽  
Design Parameters ◽  
Tropical Species ◽  
Partially Saturated ◽  
Zantedeschia Aethiopica

Vertical partially saturated (VPS) constructed wetlands (CWs) are a novel wastewater treatment system for which little information is known about its design parameters and performance under tropical climates. The objective of this study is to evaluate the nitrogen removal process from domestic wastewater and the production of tropical ornamental plants (Canna hybrids and Zantedeschia aethiopica) in VPS CWs at a mesocosms scale. Nine VPS CWs, with a free-flow zone of 16 cm and a saturated zone of 16 cm, were used as experimental units. Three units were planted with Canna hybrids., and three, with Zantedeschia aethiopica (one plant per unit); the remaining three units were established as controls without vegetation. They were fed with domestic wastewater intermittently and evaluated for the elimination of COD, N-NH4, N-NO3, Norg, NT, and PT. The results showed an increase in the removal for some pollutants in the vegetated systems, i.e., N-NH4 (35%), Norg (16%), TN (25%), and TP (47%) in comparison to the unvegetated systems. While N-NO3 removal showed better removal in 10% of the systems without vegetation, no significant differences were found (p > 0.05) for COD removal. The aerobic and anaerobic conditions in the VPS CWs favor the elimination of pollutants in the systems, and also the development of the tropical species evaluated in this study; good development was exhibited by a high growth rate and biomass production.

Enhancement of nitrogen removal in subsurface flow constructed wetlands employing a 2-stage configuration, an unsaturated zone, and recirculation

1995 ◽  
Vol 32 (3) ◽  
pp. 59-67 ◽  
Author(s):  
Kevin D. White
Keyword(s):  
Constructed Wetlands ◽  
Nitrogen Removal ◽  
Constructed Wetland ◽  
Subsurface Flow ◽  
Great Promise ◽  
Effluent Recirculation ◽  
Wetland Treatment ◽  
Subsurface Flow Constructed Wetlands ◽  
Inlet Zone ◽  
Bod Removal

Constructed wetland technology is currently evolving into an acceptable, economically competitive alternative for many wastewater treatment applications. Although showing great promise for removing carbonaceous materials from wastewater, wetland systems have not been as successful at nitrification. This is primarily due to oxygen limitations. Nitrification does occur in conventional wetland treatment systems, but typically requires long hydraulic retention times. This paper describes a study that first evaluated the capability of subsurface flow constructed wetlands to treat a high strength seafood processor wastewater and then evaluated passive aeration configurations and effluent recirculation with respect to nitrogen treatment efficiency. The first stage of a 2-stage wetland treatment system exhibited a relatively short hydraulic retention time and was designed for BOD removal only. The second stage wetland employed an unsaturated inlet zone and effluent recirculation to enhance nitrification. Results indicate that organic loading, and thus BOD removal, in the first stage wetland is key to optimal nitrification. Passive aeration through an unsaturated inlet zone and recirculation achieved up to 65-70 per cent ammonia nitrogen removal at hydraulic retention times of about 3.5 days. Inlet zone configuration and effluent recirculation is shown to enhance the nitrogen removal capability of constructed wetland treatment systems.

Biological Nitrogen Removal From Domestic Wastewater

2011 ◽  
pp. 285-296
Author(s):  
M. Ruscalleda Beylier ◽  
M.D. Balaguer ◽  
J. Colprim ◽  
C. Pellicer-Nàcher ◽  
B.-J. Ni ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Domestic Wastewater ◽  
Biological Nitrogen Removal ◽  
Biological Nitrogen

Domestic wastewater and surface runoff treatment implementations by constructed wetlands for Turkey: 25 years of experience

2021 ◽  
Vol 170 ◽  
pp. 106369
Author(s):  
Kemal Gunes ◽  
Fabio Masi ◽  
Selma Ayaz ◽  
Bilal Tuncsiper ◽  
Mehmet Besiktas
Keyword(s):  
Constructed Wetlands ◽  
Surface Runoff ◽  
Domestic Wastewater ◽  
Years Of Experience
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