Alternative filter material removes phosphorus and mitigates greenhouse gas emission in horizontal subsurface flow filters for wastewater treatment

Kasak, Kuno; Truu, Jaak; Truu, Marika; Järveoja, Järvi; Maddison, Martin; Teemusk, Alar

doi:10.1016/j.ecoleng.2015.01.038

Cited by 21 publications

(10 citation statements)

References 60 publications

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“…Nevertheless, some drawbacks, such as, too expensive or too much sludge production and also heavy metals contamination, make them inappropriate to be use. Natural materials, with low cost, easily available, are becoming attractive as adsorbents materials (Kasak et al, 2015). Therefore, this work investigates several materials, natural and commercial, with and without thermal treatment, that could act as phosphorus adsorbent agents.…”

Section: Introductionmentioning

confidence: 99%

Kinetic and equilibrium studies of phosphorous adsorption: Effect of physical and chemical properties of adsorption agent

Oliveira

Araujo

Azevedo

et al. 2015

Ecological Engineering

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Section: Introductionmentioning

confidence: 99%

Kinetic and equilibrium studies of phosphorous adsorption: Effect of physical and chemical properties of adsorption agent

Oliveira

Araujo

Azevedo

et al. 2015

Ecological Engineering

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“…Previous studies [25][26][27][28] have employed peat in constructed wetland applications, but most of these only focused on nutrient removal. As an organic substrate with relative acidic properties, peat could also be used to attenuate high pH wastewater such as alkaline mine drainage and algal-induced, elevated pH secondary effluents.…”

Section: Introductionmentioning

confidence: 99%

Peat as Substrate for Small-Scale Constructed Wetlands Polishing Secondary Effluents from Municipal Wastewater Treatment Plant

Jin

Carlos

McConnell

et al. 2017

Water

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Abstract:With the recent development of constructed wetland technology, it has become a mainstream treatment technology for the mitigation of a variety of wastewaters. This study reports on the treatment performance and pH attenuation capacity of three different configurations of small-scale on-site surface flow constructed wetlands (SFCW): T1 (Peat + Typha latifolia), T2 (T. latifolia alone), and T3 (Peat alone) treating secondary effluent from the Amherstview Water Pollution Control Plant (WPCP) for two treatment periods (start-up period and operational period). The aim of this study was to compare the nutrients removal efficiencies between the different treatments, as well as to evaluate the effects of substrate and vegetation on the wetland system. For a hydraulic retention time of 2.5 days, the results showed that all treatment systems could attenuate the pH level during both the start-up and operational periods, while significant nutrient removal performance could only be observed during the operational period. Peat was noted to be a better SFCW substrate in promoting the removal of nitrate (NO 3 -N), total nitrogen (TN), and phosphorus. The addition of T. latifolia further enhanced NO 3 -N and TN removal efficiencies, but employing T. latifolia alone did not yield effluents that could meet the regulatory discharge limit (1.0 mg/L) for phosphorus.

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“…In alkaline filters, CO 2 sequestration depends on the filter configuration. In horizontal subsurface flows with direct contact with the atmosphere, a passive sequestration of biological or atmospheric CO 2 was observed [15,16]. Active CO 2 sequestration is possible in configurations with a filter sealed with minimum contact with the atmosphere.…”

Section: Introductionmentioning

confidence: 99%

“…Few researchers measured greenhouse gas emissions or quantified the CO 2 capture of alkaline filters. Kasak et al [16] measured CO 2 , CH 4 and N 2 O emissions in horizontal subsurface flow mesocosms filled with layers of alkaline-hydrated oil shale ash and well-mineralized peat. They found that adding oil shale ash to the mesocosms significantly reduced CO 2 emissions compared to peat alone.…”

Section: Introductionmentioning

confidence: 99%

Phosphorus Removal and Carbon Dioxide Capture in a Pilot Conventional Septic System Upgraded with a Sidestream Steel Slag Filter

Claveau-Mallet

Seltani

Comeau

2020

Water

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The objective of this work was to demonstrate the removal of the phosphorus and carbon dioxide capture potential of a conventional septic system upgraded with a sidestream steel slag filter used in recirculation mode. A pilot scale sidestream experiment was conducted with two septic tank and drainfield systems, one with and one without a sidestream slag filter. The experimental system was fed with real domestic wastewater. Recirculation ratios of 25%, 50% and 75% were tested. Limestone soils and non-calcareous soils were used as drainfield media. The tested system achieved a satisfactory compromise between phosphorus removal and pH at the effluent of the septic tank, thus eliminating the need for a neutralization step. The phosphorus removal efficiency observed in the second compartment of the septic tank was 30% in the slag filter upgraded system, compared to −3% in the control system. The slag filter reached a phosphorus retention of 105 mg/kg. The drainfield of non-calcareous soils achieved very high phosphorus removal in both control and upgraded systems. In the drainfield of limestone soil, the slag filtration reduced the groundwater phosphorus contamination load by up to 75%. The removal of chemical oxygen demand of the drainfields was not affected by the pH rise induced by the slag filter. Phosphorus removal in the septic tank with a slag filter was attributed to either sorption on newly precipitated calcium carbonate, or the precipitation of phosphate minerals, or both. Recirculation ratio design criteria were proposed based on simulations. Simulations showed that the steel slag filter partly inhibited the biological production of carbon dioxide in the septic tank. The influent alkalinity strongly influenced the recirculation ratio needed to raise the pH in the septic tank. The recirculation mode allowed clogging mitigation compared to a mainstream configuration, because an important part of chemical precipitation occurred in the septic tank. The control septic tank produced carbon dioxide, whereas the slag filter-upgraded septic tank was a carbon dioxide sink.

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Alternative filter material removes phosphorus and mitigates greenhouse gas emission in horizontal subsurface flow filters for wastewater treatment

Cited by 21 publications

References 60 publications

Kinetic and equilibrium studies of phosphorous adsorption: Effect of physical and chemical properties of adsorption agent

Kinetic and equilibrium studies of phosphorous adsorption: Effect of physical and chemical properties of adsorption agent

Peat as Substrate for Small-Scale Constructed Wetlands Polishing Secondary Effluents from Municipal Wastewater Treatment Plant

Phosphorus Removal and Carbon Dioxide Capture in a Pilot Conventional Septic System Upgraded with a Sidestream Steel Slag Filter

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