Hydraulic performance of horizontal subsurface flow constructed wetlands for different strategies of filling the filter medium into the filter basin

Suliman, F.; Futsæther, Cecilia Marie; Oxaal, Unni

doi:10.1016/j.ecoleng.2006.07.017

Cited by 24 publications

(8 citation statements)

References 16 publications

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“…This has been recently confirmed in numerous experiments where it was also shown that the spatial correlation depends on the filling configuration (Suliman et al, 2007). The methodology proposed to incorporate the effect of heterogeneity is given by the following steps: 9 1.…”

Section: Methodsmentioning

confidence: 81%

“…At this stage, the system considered has the largest dimensions that can be allowed in reality, and the goal of the methodology is to identify if and to what extent they can be reduced to achieve the target effluent concentration. The hydraulic conductivity distribution depends on the physical properties of the porous medium (e.g., spatial variations in the grain size distribution) and on the strategy used to fill the HFCW basin (Suliman et al, 2007). This latter aspect can however be controlled during construction.…”

Section: Methodsmentioning

confidence: 99%

“…Even in this case however, the PFS is only limited (about 20%). Since the correlation length depends primarily on the filling strategy (e.g., Suliman et al, 2007), it can in principle be controlled and reduced using an appropriate methodology during the construction phase. In other words, except for the case with large heterogeneity, the system considered would be able to remove 90% of the contaminant with a nominal…”

Section: Treatment Efficiency and Design Methodologymentioning

confidence: 99%

“…They reported that hydrodynamics in HSCWs becomes more complex as the scale of the system increases, behavior that is also found in natural aquifers (Gelhar et al, 1992). Suliman et al (2006a,b) also investigated the effect of the inlet position on the hydraulic performance of HSCWs, while the effect of the different filling configurations of the wetland was reported by Suliman et al (2007). A correlation between the hydraulic residence time distribution (HRTD) and the extent of heterogeneity was observed and it was found that filling the system in vertical sections led to better hydraulic efficiency.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Design methodology accounting for the effects of porous medium heterogeneity on hydraulic residence time and biodegradation in horizontal subsurface flow constructed wetlands

Brovelli

Carranza-Díaz

Rossi

et al. 2011

Ecological Engineering

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Horizontal flow constructed wetlands are engineered systems capable of eliminating a wide range of pollutants from the aquatic environment. Nevertheless, poor hydrodynamic behavior is commonly found resulting in preferential pathways and variations in both (i) the hydraulic residence time distribution (HRTD) and, consequently, (ii) the wetland's treatment efficiency. The aim of this work was to outline a methodology for wetland design that accounts for the effect of heterogeneous hydraulic properties of the porous substrate on the HRTD and treatment efficiency. Biodegradation of benzene was used to illustrate the influence of hydraulic conductivity heterogeneity on wetland efficiency. Random, spatially correlated hydraulic conductivity fields following a log-normal distribution were generated

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Section: Methodsmentioning

confidence: 81%

Section: Methodsmentioning

confidence: 99%

Section: Treatment Efficiency and Design Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design methodology accounting for the effects of porous medium heterogeneity on hydraulic residence time and biodegradation in horizontal subsurface flow constructed wetlands

Brovelli

Carranza-Díaz

Rossi

et al. 2011

Ecological Engineering

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“…The significantly better treatment performances of CW3 and CW2 indicated that a multilayer substrate layout in HSCWs can be a benefit for the removal of pollutants, including both COD and N. Wetland substrate layout optimization by decreasing particle size from bottom to top may change the hydraulic conditions of the HSCWs and achieve more homogenized water flow and fewer water flow short‐cuts . In this case, COD and N removal through microbial biodegradation should significantly increase owing to enhanced pollutant–microbial contact .…”

Section: Resultsmentioning

confidence: 99%

Campus Sewage Treatment in Multilayer Horizontal Subsurface Flow Constructed Wetlands: Nitrogen Removal and Microbial Community Distribution

Bai

Lyu

Ding

et al. 2017

CLEAN Soil Air Water

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Horizontal subsurface flow constructed wetlands (HSCWs) are widely use for wastewater treatment. The objective of this study is to assess the effects of substrate‐size selection and layout optimization on pollutant removal and microbial‐community‐distribution responses in HSCWs. Three pilot‐scale constructed wetlands (CWs) are established at Guilin University of Technology, China, to treat campus sewage. The three CWs include monolayer (CW1), three‐layer (CW2), and six‐layer (CW3) substrate structures with the hydraulic conductivity of the substrate increasing from the surface to the bottom in the multilayer CWs. Under an aerial influent‐loading rate of 0.38 m per day (volumetric loading rate of 0.63 per day), CW3 exhibits the highest removal performance for chemical oxygen demand (COD), NH4+‐N, and total nitrogen (TN), with mean values of 81, 81, and 74%, respectively, followed by CW2 (68, 71, and 60%, respectively) and CW1 (56, 46, and 41%, respectively). Nitrification is demonstrates to be the limiting factor of TN removal, and higher TN‐removal performance in the multilayer CWs is attributed to the higher proportions of nitrifiers, including ammonia‐oxidising bacteria (AOB) and nitrite‐oxidizing bacteria (NOB). Moreover, 454‐pyrosequencing shows a significantly different spatial distribution of the N‐transforming microbial community in multilayer HSCWs with substrate layout optimization.

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Can phosphorus adsorption clog an alum sludge‐based biofiltration system? Evidence and insight

Yang

Wang

Zhao

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND: Aluminium-based drinking water treatment residual (Al-DWTR) has been used as an emergent substrate in laboratory-scale and pilot-scale biofiltration systems (biofilters and constructed wetlands) for its good affinity for phosphorus (P) adsorption. However, there is a concern about whether the P adsorption process will contribute to substrate clogging. Two laboratory-scale up-flow biofiltration systems were set up to identify the contribution of the P adsorption process to clogging under various operation conditions. RESULTS: Contributions of individual processes to clogging from biosolids production (S BS), inert matter generated from the conversion of residual biomass (S IS), P adsorption (S P) and inert matter production from influent total suspended solids (S SS) during operation of the two systems were assessed. After 262 days of operation, results indicated that S BS contributed most (53.16 ± 7.73%) to the clogging, followed by S SS (41.48 ± 8.02%), S P (3.14 ± 0.06%) and S IS (2.20 ± 0.27%) when treating the influent with concentrations of 284-558 mg L −1 for COD, 54-197 mg L −1 for SS and 5-13 mg L −1 for P. CONCLUSIONS: The minor contribution of the P adsorption process to substrate clogging further suggests that dewatered Al-DWTR with a high P removal capacity is a promising substrate for use in biofiltration systems.

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Hydraulic performance of horizontal subsurface flow constructed wetlands for different strategies of filling the filter medium into the filter basin

Cited by 24 publications

References 16 publications

Design methodology accounting for the effects of porous medium heterogeneity on hydraulic residence time and biodegradation in horizontal subsurface flow constructed wetlands

Design methodology accounting for the effects of porous medium heterogeneity on hydraulic residence time and biodegradation in horizontal subsurface flow constructed wetlands

Campus Sewage Treatment in Multilayer Horizontal Subsurface Flow Constructed Wetlands: Nitrogen Removal and Microbial Community Distribution

Can phosphorus adsorption clog an alum sludge‐based biofiltration system? Evidence and insight

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