Performances of a constructed wetland treating domestic wastewaters during a macrophytes life cycle

Kouki, Soulwène; Mhiri, F.; Saidi, Nurdin; Belaid, Samir; Hassen, Abdennaceur

doi:10.1016/j.desal.2008.03.067

Cited by 86 publications

(38 citation statements)

References 32 publications

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“…As a result of this drying episode, the following months showed an abnormal behavior for the BOD 5 value, a circumstance that can be related to the possible formation of preferential flow paths in the HF-CW bed that would have decreased the HRT. Other authors reported that an excessive root growth may cause the unbundling of the bed, encourage the creation of preferred paths and short circuits and open new pore spaces in the substrate [30,33]. From December 2013, a tendency to return to the proper working order of the CW was observed.…”

Section: Abatement Of Organic Mattermentioning

confidence: 95%

“…These data agree with those reported by Puigagut, Villaseñor, Salas, Bécares and García [18] and may relate to the water-saving practices followed by citizens in southeastern Spain, an area with a dry Mediterranean climate and prolonged droughts; as a result, the concentration of contaminants in domestic wastewaters are higher. An experiment run in a semi-arid zone of Tunisia showed even higher values [30].…”

Section: Water Influent and Effluent Characterizationmentioning

confidence: 99%

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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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Section: Abatement Of Organic Mattermentioning

confidence: 95%

Section: Water Influent and Effluent Characterizationmentioning

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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“…Fast plant development is greatly favorable for P retention in CWs. Variations in P removal performance of CWs depended on the growth rate of macrophyte greatly [46] and the range of removal validity increased at the presence of plant and microbial biomasses. It was observed that TP removal efficiency of CW during the plant growth was higher than that with fully developed vegetation [47].…”

Section: The Role Of Vegetation Development On Tp Removal Performancementioning

confidence: 99%

Comparative evaluation of total phosphorus removal performances for treatment of domestic and secondary wastewater using integrated vertical-flow constructed wetlands: two years’ experience

Chang

Zhang

et al. 2014

Desalination and Water Treatment

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A B S T R A C TFour small-scale gravel-based integrated vertical-flow constructed wetlands (IVCWs) were established to treat domestic and secondary wastewater (SW) in parallel under two loading rates (LRs) for an operational period of about two years and the total phosphorus (TP) removal performances were investigated and compared. Highly effective TP elimination sustained for about 10 d, with remarkable declines followed to relatively stable efficiencies for both types of wastewater. Significant difference of TP removal performance for the two types of wastewater was observed. In period 1, under high LR, the IVCWs performed better when treating domestic wastewater (DW), achieving average removal efficiency and rate of 51.6% and 0.389 g m, respectively, compared to those of 30.1% and 0.233 g mfor SW. However, in the operational period 2 fed with a low LR, better TP removal performance was achieved for SW, with reduction efficiency and rate of 41.5% and 0.057 g m −2 d −1 on average, while the corresponding value for the treatment of DW was just 12.5% and 0.023 g m. Significant correlations between TP removal efficiency and plant growth detected during this period and better developed vegetation in systems fed with SW might suggest the considerable role of plant growth, which could be influenced by inlet properties, on P retention and lifespan extending of constructed wetland. Gravel-based IVCW could be employed to remove low load of phosphorus and wastewater properties, and plant growth cycle should be taken into consideration in future IVCW design and application.

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“…The function of macrophytes within constructed wetlands has been reviewed extensively by researchers including Kouki et al [46], Türker et al [47] and Verlicchi and Zambello [48].…”

Section: Wetland To Treat Industrial Wastewatermentioning

confidence: 99%

Waste Water Treatment in Chemical Industries: The Concept and Current Technologies

Osman¹

2014

Hydrol Current Res

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The world's chemical industries face formidable environmental regulatory challenges in treating their wastewater effluents. The present work aims at highlighting the various industrial wastewater treatment technologies currently available including physico-chemical and biological processes as well as constructed wetland and conventional or advanced oxidation processes. Activated carbon prepared from low cost material, Agricultural by-product materials or modified natural polymers, which is considerably efficient for removal of direct dyes from wastewater, is also discussed. Combinations of anaerobic and aerobic treatment processes are found to be efficient in the removal of soluble biodegradable organic pollutants. The use of membrane in final stage of industrial wastewater treatments is increasing. The chemical oxidation techniques to treat wastewater, classical chemical treatment and advanced oxidation processes, is discussed.

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Performances of a constructed wetland treating domestic wastewaters during a macrophytes life cycle

Cited by 86 publications

References 32 publications

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

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

Comparative evaluation of total phosphorus removal performances for treatment of domestic and secondary wastewater using integrated vertical-flow constructed wetlands: two years’ experience

Waste Water Treatment in Chemical Industries: The Concept and Current Technologies

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