scholarly journals Assessing the environmental and economic efficacy of two integrated constructed wetlands at mitigating eutrophication risk from sewage effluent

2020 ◽  
Vol 34 (4) ◽  
pp. 669-678
Author(s):  
Richard J. Cooper ◽  
Elizabeth Hawkins ◽  
Jake Locke ◽  
Terry Thomas ◽  
Jonah Tosney
Keyword(s):  
Constructed Wetlands ◽  
Sewage Effluent ◽  
Economic Efficacy

Enhancing phosphorus removal in constructed wetlands with ochre from mine drainage treatment

2005 ◽  
Vol 51 (9) ◽  
pp. 275-282 ◽  
Author(s):  
K.V. Heal ◽  
K.E. Dobbie ◽  
E. Bozika ◽  
H. McHaffie ◽  
A.E. Simpson ◽  
...  
Keyword(s):  
Constructed Wetlands ◽  
Phosphorus Removal ◽  
Mine Drainage ◽  
Coarse Grained ◽  
Sewage Effluent ◽  
Potentially Toxic Metals ◽  
Hydraulic Design ◽  
High Sorption ◽  
Scale Experiment ◽  
End Use

No single end-use has yet been identified that is capable of consuming the projected production of ochre (mainly iron (III) oxides) from mine drainage treatment. However, the high sorption capacity of ochre for phosphorus (up to 26 mg kg−1) means that it could be used in constructed wetlands to enhance phosphorus removal. Laboratory batch experiments showed that coarse-grained ochre removes 90% of all phosphorus forms from sewage effluent after 15 minutes of shaking. From a larger-scale experiment, it is estimated that constructed wetlands with an ochre substrate should remove phosphorus from sewage effluent for up to 200–300 years. The suitability of ochre for phosphorus removal is being investigated at the field scale in a wastewater constructed wetland (175 m2 area) in Berwickshire, UK. The hydraulic and treatment performance of the wetland were monitored for 15 months prior to installation at the inlet in November 2003 of a tank containing ∼1200 kg ochre. Results so far show that improved hydraulic design is required for ochre to increase the mean phosphorus removal efficiency of the system (27±28%), but potentially toxic metals (Al, Cd, Cr, Cu, Fe, Ni, Pb, Zn) have not been released from the ochre into the wetland outflow.

A Laboratory-Scale Investigation into the Use of Powdered Iron for In situ Removal of Phosphorus from Treated Sewage Effluent with Constructed Wetlands

2001 ◽  
Vol 36 (4) ◽  
pp. 759-779 ◽  
Author(s):  
Roger L. McLaughlin ◽  
Ian D. Brindle
Keyword(s):  
Constructed Wetlands ◽  
Natural Water ◽  
Root Zone ◽  
Typha Latifolia ◽  
Sewage Effluent ◽  
Powdered Iron ◽  
Treated Sewage ◽  
Treated Sewage Effluent ◽  
Natural Water Bodies

Abstract Incorporation of powdered iron into the root bed of experimental constructed wetlands removes phosphorus from treated sewage to levels that easily meet government guidelines for discharge into natural water bodies. Various combinations of powdered iron and sand were used to determine the best arrangement that removes the largest amount of phosphorus. Macrophytes fulfill a beneficial function by delivering oxygen to the root zone and by improving drainage in the wetland. In these wetlands, cattails (Typha latifolia L.) also take up phosphorus during growth and store significant quantities of it in their leaves.

Constructed Wetlands for Wastewater Treatment in Mainland China: Two Decades of Experience

2011 ◽  
Vol 90-93 ◽  
pp. 2977-2986 ◽  
Author(s):  
Jun Zhai ◽  
Chuan Qin ◽  
Hai Wen Xiao ◽  
Qiang He ◽  
Jie Liu
Keyword(s):  
Wastewater Treatment ◽  
Constructed Wetlands ◽  
Industrial Wastewater ◽  
Sewage Treatment ◽  
Mainland China ◽  
Typha Latifolia ◽  
Domestic Wastewater ◽  
Agricultural Runoff ◽  
Sewage Effluent ◽  
Secondary Treatment

Constructed wetlands (CWs) have been applied for wastewater treatment since 1987 in Mainland China. There were about 150 public owned CWs operated to treat different types of wastewater, including urban domestic wastewater, rural sewage, effluent from secondary treatment, industrial wastewater, urban and agricultural runoff. About 44% of the CWs are designed for urban and rural sewage treatment. Hybrid CW takes a majority role for wastewater treatment in China. There are 24 full-scale hybrid CWs among the surveyed 59 systems in this paper. The most frequently used filtration media for vegetated beds are gravel and cobble. Phragmites australis is the dominate plant used in CWs in north China, while cyperus alternifolius and Typha latifolia are commonly applied in south China. The statistical average removal efficiencies of CWs for industrial wastewater treatment are the highest in terms of COD and BOD5, followed by the efficiencies of treating urban domestic wastewater, rural sewage, effluent from secondary treatment, urban and agricultural runoff in a decline order with a revise trend of the designed hydraulic loading rates.

IDENTIFYING THE MOST SUITABLE AREAS FOR SURFACE FLOW WETLAND CONSTRUCTION IN LITHUANIA

2015 ◽  
Author(s):  
Antanas DUMBRAUSKAS ◽  
Nijolė BASTIENĖ ◽  
Petras PUNYS
Keyword(s):  
Constructed Wetlands ◽  
Ecological Status ◽  
Surface Flow ◽  
Gis Analysis ◽  
Proximity Analysis ◽  
Wetland Construction ◽  
The Mean ◽  
Two Phases ◽  
Terrain Features ◽  
Surface Flow Constructed Wetlands

GIS-based approach to find the suitable sites for surface flow constructed wetlands was employed for the Lithuanian river basins with low ecological status. According to the nature of the analysed criteria the flowchart consists of two phases. Criteria used include hydrographical network, soil properties, terrain features, land use, etc. Some of them have strictly defined values (constraints), and other ranges within certain limits (factors). Limited criteria were analysed using rejection principle and influencing factors using proximity analysis and overlay methods. Selecting the potential sites using standard GIS analysis tools there was estimated about 3286 sites for possible wetlands with the mean area of inflow basin about 4 km2 in the basins of water bodies at risk.

Existence and Decontamination of HVC, Infectious Enteric Bacteria and Parasites in Sewaged Soils

2014 ◽  
Vol 3 (1) ◽  
pp. 150-158 ◽  
Author(s):  
Mohey A. Hassanain ◽  
Nawal A. Hassanain ◽  
Esam A. Hobballa ◽  
Fatma H. Abd- El Zaher ◽  
Mohamed Saber M. Saber
Keyword(s):  
Soil Sample ◽  
Potassium Permanganate ◽  
Enteric Bacteria ◽  
Sewage Effluent ◽  
Calcium Hypochlorite ◽  
Sand Soil ◽  
E Coli ◽  
Surface Sample ◽  
Loamy Sand Soil ◽  
Sewage Farm

A surface sample representing a high contaminated loamy sand soil irrigated with sewage effluent since 30 years and was cultivated with artichoke was collected from Abu-Rawash sewage farm. The existence of HVC, enteric infectious bacteria and parasites in sewaged soil found to be negative for the forward and positive for the latter's. Out of the 30 samples separated from the sewaged soil sample, only 3 samples contained parasitic fauna of developed and undeveloped Ascaris (10%) and five samples contained Entamoeba coli. Results showed that the number of Ascaris eggs/gm soil was 0.017 and the number of E. coli/gm was 0.26. Decontamination of soil parasites was effective using either calcium hypochlorite or potassium permanganate. Salmonella, Vibrio and Campelobacter were detected in the high contaminated sewaged soil and survived for 120 days in the sewaged soil under all control and bioremediated treatments irrigated with either sewage effluent or water.

ENERGY PRODUCTION FROM WASTEWATER USING HORIZONTAL AND VERTICAL SUBSURFACE FLOW CONSTRUCTED WETLANDS

2014 ◽  
Vol 13 (10) ◽  
pp. 2517-2523 ◽  
Author(s):  
Jose Villasenor Camacho ◽  
Maria del Carmen Montano Vico ◽  
Manuel Andres ◽  
Rodrigo Rodrigo ◽  
Francisco Jesus Fernandez Morales ◽  
...  
Keyword(s):  
Constructed Wetlands ◽  
Energy Production ◽  
Subsurface Flow ◽  
Subsurface Flow Constructed Wetlands
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