Long-Term Effects of Sulfide on Ammonia Oxidation and Nitrite Accumulation in a Seasonally Loaded Vertical Flow Constructed Wetland

Wetlands ◽  
2019 ◽  
Vol 40 (2) ◽  
pp. 205-222
Author(s):  
Thomas Schalk ◽  
Conrad Marx ◽  
Anita Haupt ◽  
Volker Kühn ◽  
Peter Krebs
Keyword(s):  
Constructed Wetland ◽  
Ammonia Oxidation ◽  
Nitrite Accumulation ◽  
Vertical Flow ◽  
Long Term Effects ◽  
Vertical Flow Constructed Wetland

Phosphorus removal by laboratory-scale unvegetated vertical-flow constructed wetland systems using anthracite, steel slag and related blends as substrate

2011 ◽  
Vol 63 (11) ◽  
pp. 2719-2724 ◽  
Author(s):  
Junmei Wu ◽  
Feng He ◽  
Dong Xu ◽  
Rong Wang ◽  
Xiangling Zhang ◽  
...  
Keyword(s):  
Constructed Wetland ◽  
High Efficiency ◽  
Steel Slag ◽  
Laboratory Scale ◽  
Vertical Flow ◽  
Vertical Flow Constructed Wetland ◽  
Long Term Performance ◽  
Term Performance ◽  
P Removal

This research aimed to investigate the phosphorus (P) removal of a series of laboratory-scale unvegetated vertical-flow constructed wetland systems using anthracite, steel slag and related blends as substrate in treatment of low concentration domestic sewage. The long-term performance of P removal was firstly studied by using single substrate of anthracite or steel slag, and three systems applying various combined substrates were investigated when the average P loading rate varied between 0.9 and 1.5 g TP/m2·d. The results demonstrated that both anthracite and steel slag systems were highly effective in removing total P (TP, 77.17 ± 23.34% and 90.26 ± 4.48%) and soluble reactive P (SRP, 92.14 ± 12.56% and 96.20 ± 2.58%). The system filled with anthracite, vermiculite and steel slag from the top down removed 82.45 ± 9.52% and 87.83 ± 8.58% of TP and SRP, respectively. However, other combined substrate systems showed comparative low and fluctuant P removal. The effluent pH was maintained at 7–9, which met environmental requirements of China. Therefore, anthracite provides a long-term high efficiency of P removal and may be a promising substrate from the standpoint of the effluent pH, and the arrangement of combined substrate has a prominent effect on P removal.

Enhancing nitrification in vertical flow constructed wetland utilizing a passive air pump

1998 ◽  
Vol 32 (12) ◽  
pp. 3513-3520 ◽  
Author(s):  
Michal Green ◽  
Eran Friedler ◽  
Iris Safrai
Keyword(s):  
Constructed Wetland ◽  
Vertical Flow ◽  
Vertical Flow Constructed Wetland

scholarly journals Pilot-scale study of vertical flow constructed wetland combined with trickling filter and ferric chloride coagulation: influence of irregular operational conditions

2015 ◽  
Vol 71 (7) ◽  
pp. 1088-1096 ◽  
Author(s):  
B. Kim ◽  
M. Gautier ◽  
G. Olvera Palma ◽  
P. Molle ◽  
P. Michel ◽  
...  
Keyword(s):  
Constructed Wetland ◽  
Phosphorus Removal ◽  
Water Saturation ◽  
Oxygen Demand ◽  
Pilot Scale ◽  
Saturation Level ◽  
Vertical Flow ◽  
Trickling Filter ◽  
Operational Conditions ◽  
Vertical Flow Constructed Wetland

The aim of this study was to characterize the efficiency of an intensified process of vertical flow constructed wetland having the following particularities: (i) biological pretreatment by trickling filter, (ii) FeCl3 injection for dissolved phosphorus removal and (iii) succession of different levels of redox conditions along the process line. A pilot-scale set-up designed to simulate a real-scale plant was constructed and operated using real wastewater. The influences of FeCl3 injection and water saturation level within the vertical flow constructed wetland stage on treatment performances were studied. Three different water saturation levels were compared by monitoring: suspended solids (SS), total phosphorus (TP), dissolved chemical oxygen demand (COD), ammonium, nitrate, phosphate, iron, and manganese. The results confirmed the good overall efficiency of the process and the contribution of the trickling filter pretreatment to COD removal and nitrification. The effects of water saturation level and FeCl3 injection on phosphorus removal were evaluated by analysis of the correlations between the variables. Under unsaturated conditions, good nitrification and no denitrification were observed. Under partly saturated conditions, both nitrification and denitrification were obtained, along with a good retention of SSs. Finally, under saturated conditions, the performance was decreased for almost all parameters.

Soil Microbial Abundances and Enzyme Activities in Different Rhizospheres in an Integrated Vertical Flow Constructed Wetland

2011 ◽  
Vol 39 (3) ◽  
pp. 206-211 ◽  
Author(s):  
Ying Ge ◽  
Chongbang Zhang ◽  
Yueping Jiang ◽  
Chunlei Yue ◽  
Qinsu Jiang ◽  
...  
Keyword(s):  
Constructed Wetland ◽  
Enzyme Activities ◽  
Vertical Flow ◽  
Soil Microbial ◽  
Vertical Flow Constructed Wetland

Influence of saturated zone depth and vegetation on the performance of vertical flow-constructed wetland with continuous feeding

2018 ◽  
Vol 25 (33) ◽  
pp. 33286-33297 ◽  
Author(s):  
Guochen Liu ◽  
Zonglian She ◽  
Mengchun Gao ◽  
Jiacheng Liang ◽  
Chunji Jin ◽  
...  
Keyword(s):  
Constructed Wetland ◽  
Vertical Flow ◽  
Saturated Zone ◽  
Vertical Flow Constructed Wetland ◽  
Continuous Feeding ◽  
Zone Depth
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