The performance of peat-filled subsurface flow filters treating landfill leachate and municipal wastewater

Kõiv, Margit; Vohla, Christina; Mõtlep, Riho; Liira, Martin; Kirsimäe, Kalle; Mander, Ülo

doi:10.1016/j.ecoleng.2008.04.006

Cited by 39 publications

(21 citation statements)

References 18 publications

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“…These materials strongly resist further degradation, which would contribute to elevated COD levels [45]. The low COD removals by peat was also found in other studies that employed a peat-filled substrate filter to treat landfill leachate and municipal wastewater, and only a 17% of COD removal efficiency was recorded when influent COD concentrations were well above 500 mg/L [46]. Table 4 indicates the statistical comparison of selected nitrogen and phosphorus removal efficiencies and removal rates (g/m 2 d) between T1 and T2, T1 and T3, and T2 and T3, to evaluate their individual effect on the wetland reactors.…”

Section: Organics Removalmentioning

confidence: 65%

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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Section: Organics Removalmentioning

confidence: 65%

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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“…In peat, the accumulation of total P in the filter material was about 1.5 times to almost twofold. Kõiv et al (2009) have shown that P reduction in mineralised peat filters occurs by sorption phenomenon, which is limited by suitable sorption sites on peat fibres, and their removal efficiency falls when the sorption sites become saturated. During the water-treatment experiment, the removal capacity of phosphorus decreased gradually, and the filter lost its P-binding capacity after 5 months in operation, and the estimated maximum P-binding capacity in peat was in the order of 81 mg kg -1 of P for dry peat .…”

Section: P Accumulation In Experimental Soil Filters Used For Wastewamentioning

confidence: 99%

“…The chemical analysis of the filter materials showed that before the wastewater treatment experiment Kõiv et al, 2009Kõiv et al, , 2010, the hydrated oil shale ash sediment had an average of 530 mg P kg -1 , and after the experiment (6 months) 651 mg P kg -1 . Mineralised peat had an average of 330 mg P kg -1 before and 451 mg P kg -1 after the wastewater treatment experiment.…”

Section: P Accumulation In Experimental Soil Filters Used For Wastewamentioning

confidence: 99%

Reuse potential of phosphorus-rich filter materials from subsurface flow wastewater treatment filters for forest soil amendment

et al. 2011

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The aim of this study was to test P-enriched filter materials from a wastewater treatment experiment regarding their fertilizing efficiency in pot experiments with silver birch (Betula pendula Roth.) seedlings. Tested materials included hydrated calcium-rich oil shale ash and well-mineralised peat. A mixture of peat and hydrated ash demonstrated the best results: seedlings grown on that mixture had the highest P concentration and an optimal N:P:K ratio in leaves. Hydrated ash has a low concentration of heavy metals and almost the same composition as common lime fertilizers. The hydrated ash sediment and its combination with well-mineralised peat enriched with phosphorus in wastewater treatment filters are promising materials for forest soil fertilization.

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“…Few investigations have been made regarding the saturation of the mineral filler, but it decreases significantly after a period of 5−6 years [55,56]. Mineralized peat can also adsorb P by means of an unclear process when its concentration is higher than 1.5 mg·L −1 [57]. However, the only sustainable mechanism for TP removal is plant uptake and subsequent harvesting.…”

Section: Abatement Of Total Phosphorusmentioning

confidence: 99%

Domestic Wastewater Depuration Using a Horizontal Subsurface Flow Constructed Wetland and Theoretical Surface Optimization: A Case Study under Dry Mediterranean Climate

Andreo-Martínez

García-Martínez

Almela

2016

Water

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Abstract:The wastewater generated by isolated houses without access to public sewers can cause environmental problems, like the contamination of aquifers with nitrates and phosphates, as occurs in southeastern Spain. The effectiveness of a previously built horizontal subsurface flow constructed wetland (HF-CW) was studied over two years as a possible solution. This HF-CW measured 27 m 2 ; it was planted with Phragmites australis (Cav.) Trin. ex Steud ssp. altissima and the parameters studied were those required by European Union (EU) legislation and adopted by Spain. Average abatement efficiency rates, for the first and the second year of study, were: biochemical oxygen demand over five days (BOD 5 because its content in influent wastewater was very low and they appear mainly from influent NH 4 + -N, as a result of purification processes carried out in the HF-CW bed. The abatement rates make the system suitable to produce discharges into the environment in accordance with Spanish law. It is noteworthy that the HF-CW patch suffered an episode of bed drying during the summer of 2013, whereby the causes were related to system oversizing and high evapotranspiration in the area. As a consequence, the decrease in the abatement of water pollutants during the second year can be attributed to the creation of preferential water flow paths and short circuits through the constructed wetland (CW) bed. As a result of the oversizing of the CW, a theoretical resizing based on BOD 5 , TSS, TN or TP is proposed. The calculated values for the redesign were: 5.22 m 2 considering DBO 5 , 0.18 m 2 considering TSS, 10.14 m 2 considering TN and 23.83 m 2 considering TP. Considering the area where the HF-CW was located and in accordance with Spanish law for non-sensitive areas (no TN or TP requirements for wastewater discharge), BOD 5 is the most appropriate parameter for design; it is 5.2 times lower than the HF-CW initially built and without risk of bed drying.

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The performance of peat-filled subsurface flow filters treating landfill leachate and municipal wastewater

Cited by 39 publications

References 18 publications

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

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

Reuse potential of phosphorus-rich filter materials from subsurface flow wastewater treatment filters for forest soil amendment

Domestic Wastewater Depuration Using a Horizontal Subsurface Flow Constructed Wetland and Theoretical Surface Optimization: A Case Study under Dry Mediterranean Climate

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