Intensified nitrogen removal of constructed wetland by novel integration of high rate algal pond biotechnology

2016 ◽  
Vol 219 ◽  
pp. 757-761 ◽  
Author(s):  
Yi Ding ◽  
Wei Wang ◽  
Xingpo Liu ◽  
Xinshan Song ◽  
Yuhui Wang ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Constructed Wetland ◽  
High Rate

scholarly journals High Rate Nitrogen Removal in an Alum Sludge-Based Intermittent Aeration Constructed Wetland

2012 ◽  
Vol 46 (8) ◽  
pp. 4583-4590 ◽  
Author(s):  
Yuansheng Hu ◽  
Yaqian Zhao ◽  
Xiaohong Zhao ◽  
Jeyakumar L. G. Kumar
Keyword(s):  
Nitrogen Removal ◽  
Constructed Wetland ◽  
High Rate ◽  
Intermittent Aeration ◽  
Alum Sludge

High-rate nitrogen removal in a two-stage subsurface vertical flow constructed wetland

Desalination ◽  
2009 ◽  
Vol 246 (1-3) ◽  
pp. 55-68 ◽  
Author(s):  
Guenter Langergraber ◽  
Klaus Leroch ◽  
Alexander Pressl ◽  
Kirsten Sleytr ◽  
Roland Rohrhofer ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Constructed Wetland ◽  
High Rate ◽  
Vertical Flow ◽  
Two Stage ◽  
Vertical Flow Constructed Wetland

High-rate nitrogen removal from carbon limited wastewater using sulfur-based constructed wetland: Impact of sulfur sources

2020 ◽  
Vol 744 ◽  
pp. 140969
Author(s):  
Meng Li ◽  
Rui Duan ◽  
Wen Hao ◽  
Qingcheng Li ◽  
Muhammad Arslan ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Constructed Wetland ◽  
High Rate

A two-stage subsurface vertical flow constructed wetland for high-rate nitrogen removal

2008 ◽  
Vol 57 (12) ◽  
pp. 1881-1887 ◽  
Author(s):  
Guenter Langergraber ◽  
Klaus Leroch ◽  
Alexander Pressl ◽  
Roland Rohrhofer ◽  
Raimund Haberl
Keyword(s):  
Grain Size ◽  
Nitrogen Removal ◽  
Constructed Wetland ◽  
High Rate ◽  
Organic Load ◽  
Vertical Flow ◽  
Two Stage ◽  
Drainage Layer ◽  
Main Layer ◽  
Specific Investment

By using a two-stage constructed wetland (CW) system operated with an organic load of 40 g COD·m−2·d−1 (2 m2 per person equivalent) average nitrogen removal efficiencies of about 50% and average nitrogen elimination rates of 980 g N·m−2·yr−1 could be achieved. Two vertical flow beds with intermittent loading have been operated in series. The first stage uses sand with a grain size of 2–3.2 mm for the main layer and has a drainage layer that is impounded; the second stage sand with a grain size of 0.06–4 mm and a drainage layer with free drainage. The high nitrogen removal can be achieved without recirculation thus it is possible to operate the two-stage CW system without energy input. The paper shows performance data for the two-stage CW system regarding removal of organic matter and nitrogen for the two year operating period of the system. Additionally, its efficiency is compared with the efficiency of a single-stage vertical flow CW system designed and operated according to the Austrian design standards with 4 m2 per person equivalent. The comparison shows that a higher effluent quality could be reached with the two-stage system although the two-stage CW system is operated with the double organic load or half the specific surface area requirement, respectively. Another advantage is that the specific investment costs of the two-stage CW system amount to 1,200 EUR per person (without mechanical pre-treatment) and are only about 60% of the specific investment costs of the singe-stage CW system.

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.

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