scholarly journals Purification ability of tail water and optimal hydraulic loading rates in vertical flow constructed wetland

2016 ◽  
Vol 28 (1) ◽  
pp. 114-123
Author(s):  
LIANG Kang ◽  
◽  
CHANG Junjun ◽  
WANG Feihua ◽  
LIU Shuangyuan ◽  
...  
Keyword(s):  
Constructed Wetland ◽  
Vertical Flow ◽  
Loading Rates ◽  
Hydraulic Loading ◽  
Vertical Flow Constructed Wetland ◽  
Tail Water

Evaluating performance of vertical flow constructed wetland under various hydraulic loading rates in effluent polishing

2011 ◽  
Vol 1 (2) ◽  
pp. 144-151 ◽  
Author(s):  
C. W. Maina ◽  
B. M. Mutua ◽  
S. O. Oduor
Keyword(s):  
Wastewater Treatment ◽  
Constructed Wetland ◽  
Ammonium Nitrogen ◽  
Water Bodies ◽  
Vertical Flow ◽  
Loading Rates ◽  
Hydraulic Loading ◽  
Untreated Wastewater ◽  
Treated Effluent ◽  
Vertical Flow Constructed Wetland

The discharge of untreated wastewater or partially treated effluent and runoff from agricultural fields into water bodies is a major source of surface water pollution worldwide. To mitigate this problem, wastewater treatment using wastewater stabilization ponds and constructed wetlands have been promoted. The performance of such wastewater treatment systems is strongly dependent on their hydraulics, which if not properly considered during design or operation, may result in the partially treated effluent being discharged into water bodies. This paper presents results from a study that was carried out to evaluate the performance of a vertical flow constructed wetland system under varying hydraulic loading regimes. The influent and effluent samples from the constructed wetland were collected and analysed for physical, chemical and biological parameters of importance to water quality based on recommended standard laboratory methods. The data collected was useful in determining the treatment efficiency of the wetland. The hydraulic loading rate applied ranged between 0.014 and 0.174 m/day. Phosphorus reduction for the different hydraulic loading rates ranged between 92 and 47% for lowest and highest loading rates applied respectively. However, ammonium nitrogen reduction was not significantly affected by the different hydraulic loading rates, since the reduction ranged between 97 and 94%.

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.

Influence of hydraulic loading rate and recirculation on oxygen transfer in a vertical flow constructed wetland

2019 ◽  
Vol 668 ◽  
pp. 988-995 ◽  
Author(s):  
Samara T. Decezaro ◽  
Delmira B. Wolff ◽  
Catiane Pelissari ◽  
Rolando J.M.G. Ramírez ◽  
Thiago A. Formentini ◽  
...  
Keyword(s):  
Constructed Wetland ◽  
Oxygen Transfer ◽  
Loading Rate ◽  
Vertical Flow ◽  
Hydraulic Loading Rate ◽  
Hydraulic Loading ◽  
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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