The effect of the redox-potential on the retention of phosphorus in a small constructed wetland

Braskerud, B.C.; Hartnik, Thomas; Løvstad, Øivind

doi:10.2166/wst.2005.0583

Cited by 17 publications

(11 citation statements)

References 11 publications

(11 reference statements)

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“…Similar findings have been reported for U.S. soils by Vadas and Sims (1998) and Sallade and Sims (1997). In Norway, Braskerud et al (2005) studied P dynamics in a wetland for 3 yr and determined that P was extracted from the sediments under reducing conditions; however, P losses were only noted during 19% of the 3-yr period.…”

Section: Redox Conditionssupporting

confidence: 80%

Phosphorus Transport in Agricultural Subsurface Drainage: A Review

King¹,

Williams²,

et al. 2015

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Phosphorus (P) loss from agricultural fields and watersheds has been an important water quality issue for decades because of the critical role P plays in eutrophication. Historically, most research has focused on P losses by surface runoff and erosion because subsurface P losses were often deemed to be negligible. Perceptions of subsurface P transport, however, have evolved, and considerable work has been conducted to better understand the magnitude and importance of subsurface P transport and to identify practices and treatments that decrease subsurface P loads to surface waters. The objectives of this paper were (i) to critically review research on P transport in subsurface drainage, (ii) to determine factors that control P losses, and (iii) to identify gaps in the current scientific understanding of the role of subsurface drainage in P transport. Factors that affect subsurface P transport are discussed within the framework of intensively drained agricultural settings. These factors include soil characteristics (e.g., preferential flow, P sorption capacity, and redox conditions), drainage design (e.g., tile spacing, tile depth, and the installation of surface inlets), prevailing conditions and management (e.g., soil-test P levels, tillage, cropping system, and the source, rate, placement, and timing of P application), and hydrologic and climatic variables (e.g., baseflow, event flow, and seasonal differences). Structural, treatment, and management approaches to mitigate subsurface P transport-such as practices that disconnect flow pathways between surface soils and tile drains, drainage water management, in-stream or end-of-tile treatments, and ditch design and management-are also discussed. The review concludes by identifying gaps in the current understanding of P transport in subsurface drains and suggesting areas where future research is needed.

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Section: Redox Conditionssupporting

confidence: 80%

Phosphorus Transport in Agricultural Subsurface Drainage: A Review

King¹,

Williams²,

et al. 2015

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“…Due to frequent oxygen deficits which can be observed in grit chambers, out of mineral forms of nitrogen N-NH 4 + is predominant at this stage of treatment. Also, higher concentrations of P-PO 4 − are found, most likely resulting from its additional release from bottom sediments (Braskerud et al 2005 ). The level of concentration of O 2 in the settler at some periods was also unsatisfactory.…”

Section: Resultsmentioning

confidence: 99%

“…Compared to grit chambers, the average concentration of O 2 increased by 23.4%, and BOD 5 decreased by as much as 58.6%. This phenomenon is particularly significant for self-purification processes occurring in an aquatic environment (Braskerud et al 2005 ; Juang et al 2008 ). Also, a very low average conductivity in the retention pond is notable—several times lower than in natural surface waters (Dojlido 1995 ).…”

Section: Resultsmentioning

confidence: 99%

Technical and natural conditions and operating efficiency of a municipal stormwater treatment plant

Zubala

2017

Environ Sci Pollut Res

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A decade of observations provided grounds for assessing the operation of one of the few stormwater treatment plants in Poland (system: screens—grit chambers—settler—retention pond) which collects effluents from 471 ha of the city. Among other aspects, the following were evaluated: treatment efficiency, relationship between the quality of treated stormwater and that of waters in the receiving body (the ox-bow lake of the Vistula river), operating stability of key units, significance of the facility for nature. During the assessment, the plant had a positive effect on the quality of stormwater effluents—the content of the analysed pollutants was reduced (more than 80% average efficiency for mineral forms of nitrogen and suspension matter) and oxygen ratios improved (23% increase in the average concentration of dissolved oxygen and more than 50% decrease in 5-day biochemical oxygen demand and chemical oxygen demand). Although the overall assessment of the facility’s operation was good, some omissions and operating errors were noted (method of removing retained pollutants, stormwater flow control). Eliminating them is a prerequisite for maintaining the expected reliability of the system. An effect of stormwater ponds on the increase in biodiversity in the poor urbanised landscape has also been observed. The structures, forming a uniform system along with urban green areas, constitute specific enclaves which attract living organisms.

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“…Nielsen et al (2010) irrigated two areas field with dye water for 8 hours, and the vertical section showed many dyed biopores up to 150 cm depth and staining continued farther down in fractures. Redox conditions of soil can also be a possible reason for P loss to subsurface drainage (Braskerud et al, 2005). The high positive redox potential probably conserves the redox-sensitive phosphorus in the wet condition.…”

Section: Introductionmentioning

confidence: 99%

Characterization of fly ash ceramic pellet for phosphorus removal

Cooke

Wang

et al. 2017

Journal of Environmental Management

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Phosphorus has been recognized as a leading pollutant for surface water quality deterioration. In the Midwestern USA, subsurface drainage not only provides a pathway for excess water to leave the field but it also drains out nutrients like nitrogen (N) and phosphorus (P). Fly ash has been identified as one of the viable materials for phosphorus removal from contaminated waters. In this study, a ceramic pellet was manufactured using fly ash for P absorption. Three types of pellet with varying lime and clay proportions by weight (type 1: 10% lime + 30% clay, type 2: 20% lime + 20% clay, and type 3: 30% lime + 10% clay) were characterized and evaluated for absorption efficiency. The result showed that type 3 pellet (60% fly ash with 30% lime and 10% clay) had the highest porosity (14%) and absorption efficiency and saturated absorption capacity (1.98 mg P/g pellet) compared to type 1 and 2 pellets. The heavy metal leaching was the least (30 μg/L of chromium after 5 h) for type 3 pellet compared to other two. The microcosmic structure of pellet from scanning electron microscope showed the type 3 pellet had the better distribution of aluminum and iron oxide on the surface compared other two pellets. This result indicates that addition of lime and clay can improve P absorption capacity of fly ash while reducing the potential to reduce chromium leaching.

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The effect of the redox-potential on the retention of phosphorus in a small constructed wetland

Cited by 17 publications

References 11 publications

Phosphorus Transport in Agricultural Subsurface Drainage: A Review

Phosphorus Transport in Agricultural Subsurface Drainage: A Review

Technical and natural conditions and operating efficiency of a municipal stormwater treatment plant

Characterization of fly ash ceramic pellet for phosphorus removal

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