The role of aluminium and iron in phosphorus removal by treatment peatlands

Ronkanen, Anna‐Kaisa; Marttila, Hannu; Çelebi, Ahmet

doi:10.1016/j.ecoleng.2015.11.011

Cited by 15 publications

(13 citation statements)

References 48 publications

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“…A similar DPS value for the surface layer of Fluv-16yr (117%) compared to that of the other Fluv CWs (92-123%) was found, although much more P accumulated in the Fluv-16yr surface layer ( Figure 1a, and wetlands is well documented (e.g., Reddy et al, 1995;Richardson, 1985). Our results indicate, that even though Al and Addition of cationic metals such as Fe 3+ , Al 3+ and Ca 2+ is known to enhance the efficiency of P immobilization (Karjalainen et al, 2016;Laakso et al, 2016;Ronkanen et al, 2016 (Ann et al, 2000).. Using column leaching experiments, Fe and Al containing inflow water was shown to increase P removal (up to 7 fold) and extend retention capacity (10-100 times) of peatland soils as compared to metal free water (Ronkanen et al, 2016).…”

Section: Sorption Mechanisms and Degree Of Phosphorus Saturation Ofmentioning

confidence: 46%

“…Our results indicate, that even though Al and Addition of cationic metals such as Fe 3+ , Al 3+ and Ca 2+ is known to enhance the efficiency of P immobilization (Karjalainen et al, 2016;Laakso et al, 2016;Ronkanen et al, 2016 (Ann et al, 2000).. Using column leaching experiments, Fe and Al containing inflow water was shown to increase P removal (up to 7 fold) and extend retention capacity (10-100 times) of peatland soils as compared to metal free water (Ronkanen et al, 2016). In addition, the authors reported a strong and significant correlation between removal of P and removal of Fe and Al at this site.…”

Section: Sorption Mechanisms and Degree Of Phosphorus Saturation Ofmentioning

confidence: 58%

“…. Using column leaching experiments, Fe and Al containing inflow water was shown to increase P removal (up to 7 fold) and extend retention capacity (10–100 times) of peatland soils as compared to metal free water (Ronkanen et al, 2016). In addition, the authors reported a strong and significant correlation between removal of P and removal of Fe and Al at this site.…”

Section: Resultsmentioning

confidence: 99%

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Phosphorus retention in constructed wetlands enhanced by zeolite‐ and clinopyroxene‐dominated lava sand

Alewell

Huang

McLaren

et al. 2021

Hydrological Processes

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Constructed wetlands (CWs) are engineered systems for treating wastewater by sequestering nutrients and contaminants. Our aim was to assess the main phosphorus (P) binding states in operating CWs to assess P saturation and indications on P recycling potential of filter materials, which might be necessary under future peak P scenarios. The investigated vertical flow CWs (operation time up to 16 years) are based on either fluviatile (Fluv) sand or zeolite-(Ze-LS) and clinopyroxene (Cl-LS)dominated lava sand. Organic and inorganic P accumulated in all CWs independent of filter materials and showed a considerable increase with operation time. Concentrations of P decreased sharply with depth in the Fluv-CWs compared to only a slight decrease in the lava sand CWs, with P concentrations of deeper horizons approximating the relatively P enriched original lava sand substrates. Orthophosphate was the dominant pool in all CWs, while the sum of organic fractions ranged between 11% and 33%. Sequential extraction indicated that P was mainly associated with Fe and Al (hydr)oxides for Fluv-CWs and Ze-LS-CWs, while Ca and Mg bound mineral phosphates dominated in Cl-LS-CWs. Oxalate extractions pointed to a clear dominance of P fractions associated with poorly crystalline Fe-and Al-(oxy)hydroxides. Solution 31 P NMR analyses revealed that inositol hexakisphosphates were a major pool of organic P in surface layers of CWs, which increased with operation time. With a maximum of 0.5% P content, filter sands do not appear to be a suitable fertilizer for direct application to agricultural fields. The dominance of inorganic, poorly crystalline P species point to potentially high desorption capacity which might be investigated further, to assess recycling potential of P or usage of filter materials as soil amendments with relatively high plant available P. The latter might become feasible and economically attractive under future P scarcity. Simultaneously, P saturation indexes (DPS) did not indicate an imminent P saturation of filters, since P accumulation was not restricted by binding to Al and Fe minerals. Christine Alewell and Jen-How Huang shared first authorship.

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Section: Sorption Mechanisms and Degree Of Phosphorus Saturation Ofmentioning

confidence: 46%

Section: Sorption Mechanisms and Degree Of Phosphorus Saturation Ofmentioning

confidence: 58%

Section: Resultsmentioning

confidence: 99%

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Phosphorus retention in constructed wetlands enhanced by zeolite‐ and clinopyroxene‐dominated lava sand

Alewell

Huang

McLaren

et al. 2021

Hydrological Processes

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“…PO4-P is retained in peat-based treatment wetlands mainly by chemical adsorption in the surface peat layers, and the P sorption capacity of these layers increases with increasing Fe and Al content of the peat (Heikkinen et al, 1995b;Ronkanen et al, 2016). Similarly, colloidal retention processes typical of naturally coloured waters (Heikkinen, 1990;Jones et al, 1993) exist in peat extraction site runoff water (Heikkinen and Ihme, 1995), where P is also to be found as dissolved organic P carried by HAMW organic-Fe colloids, which is therefore retained along with colloid retention (Heikkinen and Ihme, 1995;.…”

Section: Needs and Possibilities For Increasing P Retentionmentioning

confidence: 99%

Long-term purification efficiency and factors affecting performance in peatland-based treatment wetlands: An analysis of 28 peat extraction sites in Finland

Heikkinen

Karppinen

Karjalainen

et al. 2018

Ecological Engineering

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Peatland-based treatment wetlands that purify incoming water by means of natural physical, chemical and biological processes belonging to the peatland ecosystem are widely used at Finnish peat extraction sites. They can comprise either undrained or drained overland flow areas (OFAs or DOFAs), with the OFAs representing the best available technology (BAT) for peat extraction. We analyse here the long-term treatment performance of these OFAs and DOFAs and factors affecting this performance. Data on 14 OFAs and DOFAs in different parts of 2 Finland were taken from the extensive long-term environmental pollution control databases. Nearly half of these wetlands had been monitored for at least 4 years and seven for 8-23 years. The results indicated that peatland-based treatment wetlands purify drainage water as efficiently as other natural treatment wetlands on soils in general, the common challenge being phosphorus retention. Iron was also efficiently retained. The average reductions were highest in OFAs with good hydraulic function, and these also showed long-term water protection performance. An important factor affecting purification efficiency was the hydraulic loading rate. Important system design elements in this regard were the size of the wetland in relation to its catchment area, its gradient, the length of the water flow route within the wetland, and the efficient flow area of the wetland. The results regarding the latter two design elements strongly indicate that not all the areas potentially suitable in DOFAs for water purification are yet being used efficiently.

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“…Although the increase of soil labile P is closely connected with the variation of pH, lime application rates and soil properties, etc., 15‐17 the primary function of using lime to enhance P availability is through stimulating the mineralization of organic P, 16 breaking the structure of Al/Fe phosphate or decreasing the binding energy of Al/Fe (hydr)oxides 18,19 . The most common liming material for arable red soils is limestone with an application rate of 3 to 6 Mg ha −1 reported 10 .…”

Section: Introductionmentioning

confidence: 99%

Investigation of differential levels of phosphorus fixation in dolomite and calcium carbonate amended red soil

et al. 2021

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BACKGROUND The pH adjustment of acidic red soils with lime materials is beneficial for the reduction of phosphorus (P) fixation. However, the reasons for varying levels of P activation after adding different lime materials have not been fully investigated. Therefore, this study examined changes in soil labile P and P forms after phosphate application to calcium carbonate (CaCO3) and dolomite amended red soil during a 120‐day incubation period. Also change of P sorption properties in the amended soil samples from day 120 were examined through a sorption–desorption experiment. RESULTS The increase of soil H2O‐P and NaHCO3‐P in the CaCO3 and dolomite amended soil treatments was mainly ascribed to the decline of the NaOH‐P. However, when compared with the control treatment after 120 days, soil Olsen‐P significantly increased by 34% and 66% in the CaCO3 and dolomite treatments. The Hedley P fractionation results demonstrated that the CaCO3 application caused a notable increase of HCl‐P (stable Ca–P), which was 88.4% higher than that in the dolomite treatment. However, the formation of stable P was strongly suppressed in the dolomite treatment due to the presence of magnesium (Mg), which was identified by the negative relationship between M3‐Mg and HCl‐P. In line with these findings, P sorption–desorption work showed weaker P binding energy in the dolomite treatment relative to the CaCO3 treatment. CONCLUSION In terms of increasing P availability in red soil, this study suggests that dolomite should be used to substitute CaCO3 in order to reduce the soil P fixation. © 2021 Society of Chemical Industry.

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The role of aluminium and iron in phosphorus removal by treatment peatlands

Cited by 15 publications

References 48 publications

Phosphorus retention in constructed wetlands enhanced by zeolite‐ and clinopyroxene‐dominated lava sand

Phosphorus retention in constructed wetlands enhanced by zeolite‐ and clinopyroxene‐dominated lava sand

Long-term purification efficiency and factors affecting performance in peatland-based treatment wetlands: An analysis of 28 peat extraction sites in Finland

Investigation of differential levels of phosphorus fixation in dolomite and calcium carbonate amended red soil

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