scholarly journals How Waterlogged Conditions Influence the Nitrogen Removal Performance in a Micro Constructed Wetland

2021 ◽  
Author(s):  
Lumeng Xie ◽  
Ying Liu ◽  
Shiqiang Zhao ◽  
Liyi Dai ◽  
Mingxiang Zhang ◽  
...  
Keyword(s):  
Root System ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Constructed Wetland ◽  
Plant Biomass ◽  
Lythrum Salicaria ◽  
Short Term ◽  
Removal Rates ◽  
Wetland Ecosystems ◽  
The Relationship

Abstract Growing populations and industrialization have led to raised wetland ecosystems nitrogen(N) loads. A micro constructed wetland planted with Lythrum salicaria L treating an artificial wastewater was used to investigate the short-term variations in the plant biomass and the removal efficiency of N. Our results showed that the biomass of Lythrum salicaria L. increased rapidly during the experiment due to their extensive root system and vigorous spread, and waterlogged conditions had little effect on the relationship between biomass and the concentration of TN in soil and effluent. Under different waterlogged conditions, the removal rates of TN in the water were all more than 60%, providing a reference for waterlogged conditions used in wetland eutrophication restoration.

Plant Species Richness Increased Belowground Plant Biomass and Substrate Nitrogen Removal in a Constructed Wetland

2013 ◽  
Vol 41 (7) ◽  
pp. 657-664 ◽  
Author(s):  
Hai Wang ◽  
Zheng-Xin Chen ◽  
Xiao-Yu Zhang ◽  
Si-Xi Zhu ◽  
Ying Ge ◽  
...  
Keyword(s):  
Species Richness ◽  
Plant Species ◽  
Nitrogen Removal ◽  
Constructed Wetland ◽  
Plant Biomass ◽  
Plant Species Richness ◽  
Belowground Plant Biomass

The Ammonia Nitrogen Removal Enhanced by Biological Aerobic Filter Packed with a Novel Lightweight Zeolite Particles

2013 ◽  
Vol 361-363 ◽  
pp. 764-767
Author(s):  
Hai Tang ◽  
Long Ouyang ◽  
Xiang Zhao
Keyword(s):  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Ammonia Nitrogen ◽  
Exponential Equation ◽  
N Concentration ◽  
N Removal ◽  
Optimal Value ◽  
Relationship Of ◽  
The Relationship

The ammonia nitrogen (NH4-N) removal enhanced by biological aerobic filter (BAF) packed with novel micro-mesoporous lightweight zeolite particles (LZP) as carrier. The results showed that the biofilm can quickly grow up using LZP as media in the BAF. HLR of 1.2 was chosen as the optimal value under the average influent NH4+-N concentration of 24.6 mg/L, percent NH4-N removal of 87% and NLR of 0.24 kgN/m3.d was achieved. The kinetic performance of the LZP-BAF indicated that the relationship of NH4-N removal efficiency with the L could be described by an exponential equation (Ce/Ci=exp (-1.24/L0.344)).

scholarly journals Effects of HRT on the efficiency of denitrification and carbon source release in constructed wetland filled with bark

2017 ◽  
Vol 75 (12) ◽  
pp. 2908-2915 ◽  
Author(s):  
Yinghe Jiang ◽  
Yao Li ◽  
Ying Zhang ◽  
Xiangling Zhang
Keyword(s):  
Carbon Source ◽  
Removal Efficiency ◽  
Constructed Wetland ◽  
Reaction Rate ◽  
Reaction Rate Constant ◽  
Municipal Sewage ◽  
First Order ◽  
N Removal ◽  
Carbon Release ◽  
The Relationship

Constructed wetland is widely used to treat municipal sewage. However, lack of carbon source always constraints the application of constructed wetland in advanced tailwater treatment process. Bark was used as the filler and external carbon source of constructed wetland in the study, and the effects of hydraulic retention time (HRT) on NO3−−N removal efficiency and carbon release velocity were explored. Results showed that the NO3−−N removal process was steady in the constructed wetland filled with bark without additional carbon source. The NO3−−N removal efficiency and NO3−−N concentration presented a first-order reaction. The reaction rate constant k was 0.4 day−1. The relationship between NO3−−N removal efficiency (η) and HRT (t) was η = 1-e−0.4t, and η was increased with increasing of HRT. η reached a maximum of 77% at HRT of 4.48 days. η obtained the minimum of 20% at HRT of 0.75 days. The relationship between the carbon source releasing velocity (v) by bark and HRT was v = 0.53(1.62/t-1/t2) + 0.32. v increased first and then decreased with HRT increasing. The maximum v was detected at t = 1.12 days.

Step-wise temperature decreasing cultivates a biofilm with high nitrogen removal rates at 9°C in short-term anammox biofilm tests

2016 ◽  
Vol 37 (15) ◽  
pp. 1933-1946 ◽  
Author(s):  
Ivar Zekker ◽  
Ergo Rikmann ◽  
Anni Mandel ◽  
Kristel Kroon ◽  
Andrus Seiman ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
High Nitrogen ◽  
Short Term ◽  
Removal Rates

EFFECTS OF PLANT DIVERSITY ON PLANT BIOMASS AND EFFLUENT NITROGEN REMOVAL IN A CONSTRUCTED WETLAND

2015 ◽  
Vol 14 (8) ◽  
pp. 1987-1994
Author(s):  
Jie Chang ◽  
Hai Wang ◽  
Zhengxin Chen ◽  
Ying Ge ◽  
Chengcai Huang ◽  
...  
Keyword(s):  
Plant Diversity ◽  
Nitrogen Removal ◽  
Constructed Wetland ◽  
Plant Biomass

scholarly journals Cyanobacterial Nitrogen Fixation Influences the Nitrogen Removal Efficiency in a Constructed Wetland

Water ◽  
2017 ◽  
Vol 9 (11) ◽  
pp. 865 ◽  
Author(s):  
Xiaodong Zhang ◽  
Xin Jia ◽  
Liang Yan ◽  
Jinzhi Wang ◽  
Xiaoming Kang ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Constructed Wetland

Feasibility of conventional and single-stage anaerobic ammonium oxidation processes for treating chlortetracycline wastewater

2014 ◽  
Vol 70 (6) ◽  
pp. 947-954 ◽  
Author(s):  
Miaomiao Liu ◽  
Hong Yao ◽  
Hao Liu ◽  
Jing Xu ◽  
Lushen Zuo
Keyword(s):  
Removal Efficiency ◽  
Total Nitrogen ◽  
Nitrogen Removal ◽  
Single Stage ◽  
Anaerobic Ammonium Oxidation ◽  
Ammonium Oxidation ◽  
Pharmaceutical Wastewater ◽  
Removal Rates ◽  
Oxidation Processes ◽  
Bench Scale

Conventional and single-stage anaerobic ammonium oxidation (ANAMMOX) was carried out in bench-scale reactors to treat chlortetracycline (CTC) wastewater. The total nitrogen (TN) removal efficiency and rate for conventional ANAMMOX was 66.6 ± 5.9% and 2.7 ± 0.2 kg N/(m3·d), respectively, which was 58.6 ± 3.8% and 1.2 ± 0.1 kg N/(m3·d) for single-stage ANAMMOX. Single-stage ANAMMOX showed higher tolerance to CTC than conventional ANAMMOX. The nitrogen removal of conventional and single-stage ANAMMOX began to deteriorate when CTC was added, to 40 and 80 mg/L, respectively, with the former totally inhibited at 120 mg/L CTC and the latter at 140 mg/L CTC. TN removal rates were recovered to 1.2 and 0.7 kg N/(m3·d), respectively, when CTC concentration was reduced to 20 mg/L for 8 days. This study implied that ANAMMOX could be efficiently used to treat pharmaceutical wastewater, with single-stage implementation being more stable under antibiotic pressure.

scholarly journals Nitrogen Removal Efficiency of Yaonigou Integrated Constructed Wetland on the Bank of Lake Fuxian, Yunnan Province

2004 ◽  
Vol 16 (4) ◽  
pp. 331-337
Author(s):  
CHEN Yuangao ◽  
◽  
LI Wenchao ◽  
LI Yinxi ◽  
HOU Changding ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Constructed Wetland ◽  
Yunnan Province ◽  
Lake Fuxian ◽  
Integrated Constructed Wetland

scholarly journals Nitrogen removal from summer to winter in a field pilot-scale multistage constructed wetland-pond system

2020 ◽  
Author(s):  
Liping Xiao ◽  
Tao Wang ◽  
Hongbin Lu ◽  
Shaoyong Lu ◽  
Jiaxin Li ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Total Nitrogen ◽  
Nitrogen Removal ◽  
Constructed Wetland ◽  
Pilot Scale ◽  
Surface Flow ◽  
Treatment Unit ◽  
Pond System ◽  
Load Rate ◽  
Plant Harvesting

Abstract Background Single-stage constructed wetlands (CWs) has a single ecological service function and is greatly affected by temperature, which are general in removal of total nitrogen. Multistage hybrid CWs were proven to capable of enhancing removal of nitrogen. Therefore, this study aimed to explore the variation in nitrogen removal in the combined CWs-pond process from summer to winter and the contribution of plant harvesting and the functions of bacteria to nitrogen removal. Methods A pilot-scale multistage constructed wetland-pond system (MCWP) with the process of "the pre-ecological oxidation pond + the two-level horizontal subsurface flow constructed wetland (HSCW) + the surface flow constructed wetland (SFCW) and the submerged plant pond (SPP)" was used to treat actual polluted river water in the field. During the 124 days of operation, the nitrogen concentrations in the units influent and effluent of the system were measured every two days, and the plant height in HSCWs and SFCW was measured once per month. When the system operated stably to the 72nd day, the substrates in the CWs were sampled to analyze the bacterial community structure and composition. Results The concentration of total nitrogen (TN) in the MCWP gradually decreased from 3.46 mg/L to 2.04 mg/L, and the average removal efficiency of TN was approximately 40.74%. The SPP performed the best among all units, and the TN removal efficiency was as high as 16.08%. The TN removal efficiency was significantly positively affected by the daily highest temperature. A formula between the total TN removal efficiency and the highest temperature was obtained by nonlinear fitting. The TN removal load rate in the HSCWs was 2.7–3.7 times that of the SFCW. Furthermore, the TN transformed by Iris pseudacorus L. accounted for 54.53% in the SFCW. Conclusion We found that the significant positive correlation between the daily highest temperature and the total TN removal rate a field MCWP system. The SFCW, as an advanced treatment unit, increased the proportion of nitrogen removed by plant harvesting. The bacteria completed the nitrogen cycle in the SFCW, which had high-density planting, through a variety of nitrogen removal pathways.

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