Granulated apatite filters for phosphorous retention in treatment wetlands: Experience from full-scale applications

Delgado-González, Laura; Prost-Boucle, Stéphanie; Troesch, Stéphane; Molle, Pascal

doi:10.1016/j.jwpe.2021.101927

Cited by 5 publications

(2 citation statements)

References 19 publications

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“…In various small WWTPs across France, apatite filters have already been installed for phosphorus retention. The material, however, is presented in a granulated form, which has failed to provide long-lasting results; moreover, it displays high pH values for several months following system start-up (Delgado-González et al, 2021;Delgado-Gonzalez et al, 2021). These results support the idea that natural apatite may still be a more appropriate solution; however, a better understanding of the processes taking place and the limitations of such a system is required before considering any technological upscaling.…”

Section: Introductionmentioning

confidence: 88%

Seeded phosphorus retention in fixed-bed laboratory columns by the use of apatites

Delgado-González

Lartiges²,

Troesch³

et al. 2022

Front. Environ. Sci.

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Phosphorus retention in small- and medium-sized wastewater treatment plants is crucial to preventing the eutrophication of downstream catchments. One popular solution in combination with treatment wetlands is the use of reactive filters for phosphorus retention; however, identifying a suitable substrate is not an easy task in this process. Apatites have already proven to be an effective alternative for phosphorus retention, yet more in-depth research is needed. This article uses two natural apatite materials, NA1 and NA2, introduced in four fixed-bed laboratory columns to assess their phosphorus retention capacity. Various inflow conditions are set for the NA1 substrate to evaluate the impact of calcium and biomass development on performance. The substrates show high phosphorus retention (>16.8 g PO4-P/kg for NA1 and >17.5 g PO4-P/kg for NA2) as well as high kinetic rate coefficients (1.45 and 1.70 h−1 for NA1 and NA2, respectively), with performances above 80% for both substrates. The maximum phosphorus retention capacity is not attained at the end of the experiments, despite their long duration (230 days) and the short hydraulic residence times applied (∼2 h), thus suggesting a long-term removal capacity. The NA1 column fed with a calcium-deficient synthetic solution displays just slightly reduced kinetic rates, most likely due to calcite and dolomite dissolution from the media. The column fed with treated wastewater does not reveal any significant reduction in hydraulic conductivity due to biomass development. No loss of permeability due to chemical clogging was observed in the other columns. Scanning electron microscopy indicates that phosphorus retention occurs by the precipitation of amorphous calcium phosphate for both natural apatites, thereby clearly demonstrating the implementation of seeding mechanisms. Such a retention process is sustainable, which suggests it may proceed over even higher retention capacities.

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Section: Introductionmentioning

confidence: 88%

Seeded phosphorus retention in fixed-bed laboratory columns by the use of apatites

Delgado-González

Lartiges²,

Troesch³

et al. 2022

Front. Environ. Sci.

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“…In this section, studies related to the use of different substrates in full‐scale CWs are discussed and some results are displayed in Table 3. Delgado‐González et al (2021) studied the performance of full‐scale HFCW planted with Phragmites australis with apatite as substrate treating domestic wastewater for phosphorus adsorption was commissioned in 2013. The hydraulic evaluation revealed heterogeneous flow in the system which caused variation in performance due to the large surface area of the filter and inadequate maintenance of the distribution system.…”

Section: Materials Study In Cwsmentioning

confidence: 99%

Materials in constructed wetlands for wastewater remediation: A review

Patyal

Jaspal

Khare

2021

Water Environment Research

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The wastewater treatment industry is constantly evolving to abate emerging contaminants and to meet stringent legislative requirements. The existing technologies need to be modified, or new innovative treatment techniques need to be developed to ensure environmental protection and secure sustainability in the future. Emphasis is mainly on nutrient recovery, energy‐efficient systems, zero waste generation, and environmentally friendly techniques. Constructed wetlands (CWs) have evolved as natural, eco‐friendly, economical, and low‐maintenance alternatives for wastewater remediation. These wetlands employ several materials as adsorbents for the treatment, commonly known as media/substrate. This review paper presents an assessment of various materials that can be used as substrates in CWs for the efficient removal of organic and non‐biodegradable pollutants in different types of wastewaters. The effect of pH, mineral composition, specific surface area, and porosity of various natural materials and agricultural and industrial wastes used as media in CWs for wastewater remediation was discussed. The study showed that different substrates like alum sludge, limestone, coal slags, rice husk, and sand had removal efficiency for chemical oxygen demand (COD): 71.8%–82%, total phosphorous (TP): 77%–80%, and total nitrogen (TN): 52%–82% for different types of wastewaters. It also highlights the challenges related to the long‐term sustainability of these materials. Practitioner points Physicochemical characteristics influence the removal efficiency of the materials Life of media is also important along with removal efficiency and cost The sustainability of materials is very crucial for the overall performance of the system

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Constructed Wetlands for removal of Phosphorus from Domestic Wastewater-A Patent Review

Patyal

Jaspal

Tiwari

et al. 2022

Sustain. Water Resour. Manag.

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Granulated apatite filters for phosphorous retention in treatment wetlands: Experience from full-scale applications

Cited by 5 publications

References 19 publications

Seeded phosphorus retention in fixed-bed laboratory columns by the use of apatites

Seeded phosphorus retention in fixed-bed laboratory columns by the use of apatites

Materials in constructed wetlands for wastewater remediation: A review

Constructed Wetlands for removal of Phosphorus from Domestic Wastewater-A Patent Review

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