Performance of a vertical subsurface flow constructed wetland under different operational conditions

Abdelhakeem, Sara G.; Aboulroos, S. A.; Kamel, Mohamed

doi:10.1016/j.jare.2015.12.002

Cited by 114 publications

(57 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This result is in agreement with [34], who suggested that change of pH to alkaline condition was probably due to the addition of oxygen through dissolution of atmospheric oxygen and photosynthetic activity by the plant. COD and BOD 5 produced by the pyrolysis plant were higher than the limit of the Italian Law; the results obtained after the CW treatment indicate that the CW was able to oxygenate the wastewater to a level that supports the aerobic degradation of the contaminants produced by pyrolysis, as previously observed by [35]. The CW treatment also improved the physical characteristics of the wastewaters, such as color and odor.…”

Section: Discussionsupporting

confidence: 58%

Phytodepuration of Pyroligneous Liquor: A Case Study

et al. 2020

View full text Add to dashboard Cite

Wastewaters generated by the pyrolytic process require treatments to reduce the risks of contamination in rivers, lakes, and coastal waters. Utilizing constructed wetlands is one of the possible approaches according to a Circular Economy System. Plant Growth-Promoting Bacteria (PGPB) and Arbuscular Mycorrhizal Fungi (AMF) can improve plant growth and enhance the bioremediation of wastewater. Two experiments were set up: in the first, a pilot mesocosm was designed to evaluate the effects of a consortium of AM fungi and a PGPB strain on Phragmites australis. After 60 days, the highest plant growth was obtained after inoculation with the combination of microorganisms. In the second experiment, a constructed wetland was built to remediate wastewaters from gasification plant. The plants were efficient in scavenging biological oxygen demand (BOD5), chemical oxygen demand (COD), total fat and oils, hydrocarbons, phenols, aldehydes, surfactants, fluorides, sulfites, sulfates, nitrate, and phosphorus. These data suggest that inoculation of P. australis with AMF and PGPB strains significantly improve the depuration process of wastewaters from gasification plants via constructed wetlands.

show abstract

Section: Discussionsupporting

confidence: 58%

Phytodepuration of Pyroligneous Liquor: A Case Study

et al. 2020

View full text Add to dashboard Cite

show abstract

“…In phases II and III, the higher flow rate may have caused a higher atmospheric air drag and, consequently, promoted a greater atmospheric oxygen entry into the system (Gaboutloeloe et al, 2009;Abdelhakeem et al, 2016), resulting in a higher oxidation of nitrite into nitrate. In phase III, we observed a decrease in the outflow values of TKN and nitrite and an increase between 5 and 50% in nitrate concentrations in VFCW outflows.…”

Section: Resultsmentioning

confidence: 99%

Nutrient Removal From Swine Wastewater in a Combined Vertical and Horizontal Flow Constructed Wetland System

Boas

Fia

et al. 2018

Eng. Agríc.

View full text Add to dashboard Cite

This study aimed to assess the performance of a combined vertical flow (VFCW) and horizontal subsurface-flow (HFCW) constructed wetland systems built on a pilot scale and submitted to different configurations and organic load application rates of pre-treated swine wastewater (SWW) in anaerobic systems on the nitrogen and phosphorus removal.The average values of redox potential in the systems were between anoxic and aerobic conditions, favoring an increased nitrate concentration in VFCW. Nitrogen removal by VFCW-HFCW system can be considered as satisfactory, reaching removal values of 75%. VFCW and HFCW proved to be limited in phosphorus removal, reaching values of 48%.

show abstract

“…Aquatic plants in natural water flow as are present in a river, lake or reservoir is usually used as a key phytoremediation element in eco-restoration projects because of its many benefits to an aquatic environment [1][2][3]. The beneficial effects of aquatic plants on the deposition, retention and filtration of suspended sediment in the deep part of a flow due to the plants' extensive root system has been widely acknowledged [4][5][6][7]. In the above-plant region, aquatic plants also influence the transport and movement of fine suspended sediment.…”

Section: Introductionmentioning

confidence: 99%

Vertical Distribution of Suspended Sediments above Dense Plants in Water Flow

Xie

2019

Water

View full text Add to dashboard Cite

Plants in natural water flow can improve water quality by adhering and absorbing the fine suspended sediments. Dense plants usually form an additional permeable bottom boundary for the water flow over it. In the flow layer above dense plants, the flow velocity generally presents a zero-plane-displacement and roughness-height double modified semi-logarithmic profile. In addition, the second order shear turbulent moment (or the Reynolds stress) are different from that found in non-vegetated flow. As a result, the turbulent momentum diffusivity of flow and thus the diffusivity of sediment will shift, which will cause the vertical profile of suspended sediment and the corresponding Rouse formula deform. A set of physical experiments with three different diameters of fine suspended sediments was conducted in an indoor water flume. These experiments investigated a new distribution pattern of suspended sediment and the correspondingly deformed Rouse formula in the flow layer over the dense plants. Experimental results showed that above the dense plants, the shear turbulent momentum of flow presented a plant-height modified negative linear profile, which has been proposed by a previous study, and the vertical distribution of fine suspended sediments presented an equilibrium pattern. Based on the plant-modified profiles of flow velocity and the shear turbulent momentum a new zero-plane and plant-height double modified Rouse formula were analytically derived. This double-parameter modified Rouse formula agrees well with the measured profile of suspended sediment concentration experimentally observed in the present study. By adjusting the Prandtl-Schmidt number, i.e., the ratio of sediment diffusivity to flow diffusivity, the double-parameter modified Rouse formula can be applied to submerged dense plant occupied flow.

show abstract

Performance of a vertical subsurface flow constructed wetland under different operational conditions

Cited by 114 publications

References 16 publications

Phytodepuration of Pyroligneous Liquor: A Case Study

Phytodepuration of Pyroligneous Liquor: A Case Study

Nutrient Removal From Swine Wastewater in a Combined Vertical and Horizontal Flow Constructed Wetland System

Vertical Distribution of Suspended Sediments above Dense Plants in Water Flow

Contact Info

Product

Resources

About