Effects of plant diversity and hydraulic retention time on pollutant removals in vertical flow constructed wetland mesocosms

2012 ◽  
Vol 49 ◽  
pp. 244-248 ◽  
Author(s):  
Chong-Bang Zhang ◽  
Wen-Li Liu ◽  
Jiang Wang ◽  
Ying Ge ◽  
Bin-He Gu ◽  
...  
Keyword(s):  
Plant Diversity ◽  
Constructed Wetland ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Vertical Flow ◽  
Vertical Flow Constructed Wetland ◽  
Wetland Mesocosms

scholarly journals A tracer study in a vertical flow constructed wetland treating septage

2018 ◽  
Vol 15 (3) ◽  
pp. 345-353 ◽  
Author(s):  
Jason Jie Xiang Bui ◽  
Yee Yong Tan ◽  
Fu Ee Tang ◽  
Carrie Ho
Keyword(s):  
Constructed Wetlands ◽  
Constructed Wetland ◽  
Retention Time ◽  
Evaluation Method ◽  
Hydraulic Retention Time ◽  
Vertical Flow ◽  
Content Type ◽  
Hydraulic Loading ◽  
Hydraulic Behaviour ◽  
Vertical Flow Constructed Wetland

Purpose This study aims to investigate the hydraulic behaviour of a pilot-scale, two-staged, vertical flow constructed wetland (VFCW) for septage treatment, in terms of factors such as hydraulic retention time and hydraulic loading rate and its influence on the treatment dynamics. Because of intermittent feeding mode of VFCW systems and variation in its loading, its hydraulic behaviour is highly variable and need to be understood to optimize its treatment performance. Design/methodology/approach Tracer test were carried out using bromide ion with varying hydraulic loading rates (HLR) of 6.82 cm/d, 9.09 cm/d and 11.40 cm/d (i.e. equivalent to 75 L/d, 100L/d and 125 L/d). Tracer data is then analysed using the Residence Time Distribution (RTD) method. Findings RTD analysis showed that the increase in HLR increases the average hydraulic retention time (HRT). Subsequently, the increase in HLR results in a lower recovery of effluent, resulting in poor productivity in treatment. The study also showed that the removal of nitrogen and organic matter improved with increasing HRT. However, observations show no correlation between HRT and total solids removal. Originality/value A performance evaluation method (by tracer) is proposed to understand the hydraulics of flow in constructed wetlands, which has not been widely studied. Additionally, the dynamics of treatment in VFCWs treating septage may also be revealed by the tracer method. The study can be applied to any constructed wetlands designed for treatment of wastewater, septage or sludge.

Effects of plant diversity on biomass production and substrate nitrogen in a subsurface vertical flow constructed wetland

2010 ◽  
Vol 36 (10) ◽  
pp. 1307-1313 ◽  
Author(s):  
Si-Xi Zhu ◽  
Han-Liang Ge ◽  
Ying Ge ◽  
Hai-Qin Cao ◽  
Dong Liu ◽  
...  
Keyword(s):  
Biomass Production ◽  
Plant Diversity ◽  
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
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