Treatment of wastewater by natural systems

Ayaz, Selma; Akça, Lütfi

doi:10.1016/s0160-4120(00)00099-4

Cited by 66 publications

(25 citation statements)

References 7 publications

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“…Therefore, the result of this study is good (42-63%), in comparison with the reported results on phosphorus removal. Removal efficiency range of 30-58% was reported by Ayaz and Akça (2001) and Zhang et al (2014) which is similar to the recorded result of the present study. Gnansounou et al (2017) reported 45% of phosphorus removal efficiency using Vetiver which also corroborated the present result.…”

Section: -P)supporting

confidence: 92%

Bioremediation of brewery wastewater using hydroponics planted with vetiver grass in Addis Ababa, Ethiopia

Abebe

Tefera

Kloos

et al. 2018

Bioresour. Bioprocess.

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Background: Bioremediation is the use of biological interventions for mitigation of the noxious effects caused by pollutants in the environment including wastewater. It is very useful approach for a variety of applications in the area of environmental protection. It has become an attractive alternative to the conventional cleanup technologies that employ plants and their associated microorganisms to remove, contain, or render harmless environmental contaminants.Methods: Three parallel hydroponic treatment systems (each 2 m long × 0.75 m wide × 0.65 m deep) and one control unit were filled with brewery wastewater to an effective depth of 0.5 m. Two sets of floating polystyrene platform were used for each treatment unit to support vetiver tillers for conducting bioremediation study. The wastewater was fed to the hydroponic treatment units at hydraulic loading rate of 10 cm d −1 and hydraulic residence time of 5 days. Influent and effluent samples were collected once a month for 7 months, and analyzed to determine the various parameters relating to the water quality including plant growth and nutrient analyses.Results: Vetiver grass grew and established with well-developed root and shoots in the hydroponics under fluctuations of brewery wastewater loads and showed phytoremedial capacity to remove pollutants. Removal efficiencies for BOD 5 and COD were significant (p < 0.05), up to 73% (748-1642 mg l −1 inlet), and up to 58% (835-2602 mg l −1 inlet), respectively. Significant removal efficiencies (p < 0.05) ranged from 26 to 46% (14-21 mg l −1 inlet) for TKN, 28-46% (13-19 mg l −1 inlet) for NH 4 + -N, 35-58% (4-11 mg l −1 inlet) for NO 3 − -N, and 42-63% (4-8 mg l −1 inlet) for PO 4 −3 -P were recorded. Nutrient accumulation in the samples harvested were varied between 7.4 and 8.3 g N kg −1 dry weight and 6.4-7.5 g P kg −1 dry weight in the hydroponic treatment units during the study period. Conclusions:This study has shown suitability of vetiver grass for organics and nutrient removal in the bioremediation of brewery wastewater using hydroponics technique in addition to production of valuable biomass. Bioremediation using hydroponics is green and environmentally sustainable approach that offers promising alternative for wastewater treatment in developing countries including Ethiopia.

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Section: -P)supporting

confidence: 92%

Bioremediation of brewery wastewater using hydroponics planted with vetiver grass in Addis Ababa, Ethiopia

Abebe

Tefera

Kloos

et al. 2018

Bioresour. Bioprocess.

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“…They not only take up nutrients, but are also able to adsorb and accumulate metals. Besides Phragmites australis, some Cyperus species are commonly used in constructed wetlands (Tang, 1993;Greenway and Woolley, 1999;Ayaz and Akca, 2001;Okurut et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Efficiency of constructed wetlands in decontamination of water polluted by heavy metals

Cheng

Große

Karrenbrock³

et al. 2002

Ecological Engineering

257

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“…Here, Typha domingensis played a fundamental role on the depuration of the inflow waters. Ayaz and Akça (2001) studied several species of aquatic macrophytes on CWs using a surface continuous flow and concluded that aquatic macrophytes are important components of constructed wetlands, being responsible for the removal of 88% of ammonium and 48% of orthophosphate. On the other hand, three out of those four variables showed an increment in the unvegetated constructed wetlands in relation to the inflow waters.…”

Section: Mesocosm Experimentsmentioning

confidence: 99%

“…The use of constructed wetlands for the improvement of the water quality is being largely studied, mainly in developing countries (AYAZ; AKÇA, 2001) and has increased worldwide in recent decades to reduce nutrient concentrations and to degrade organic compounds (MCINERNEY; HELTON, 2016). The main advantages of the utilization of such systems are: (i) the occurrence of the physical, chemical and biological processes of water treatment at the same time; (ii) the low implementation and operation costs in relation to the traditional methods (AYAZ; AKÇA, 2001); (iii) the establishment of an aesthetically pleasant sewage treatment station (AYAZ; AKÇA, 2001); (iv) the use of a method that is environmentally acceptable for sewage treatment, since it is based on natural processes (DECAMP;WARREN, 2000).…”

Section: Introductionmentioning

confidence: 99%

A importância de um alagado para a qualidade da água em um ecossistema urbano impactado por resíduos domésticos

Lannes

Aragon

2016

Ambiência

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Lakes and lagoons are abundant components of the natural landscape of the state of Rio de Janeiro, Brazil. However, due to human activities, many of those are under strong ecological impact. Vigario Lake and Taquaruçu Lake are important water bodies in the city of Campos dos Goytacazes but still receive domestic sewage along their margins. The water flows from Vigario to Taquaruçu Lake, passing through a wetland, which is fully colonized by aquatic macrophytes, especially Typha domingensis and Eichhornia crassipes. In this study, water samples were collected during a monthly monitoring of 12 months in 1999 and an intensive sampling in the dry and wet periods in 2000/2001 in representative stations along the study area for determination of physico-chemical and chemical variables. In the wetland, a place of anoxic characteristics, denitrification, ammonification and release of orthophosphate from the sediment to the water column could be detected, while other important limnological processes of oxidant waters could be observed in the lakes, despite the contamination. A controlled mesocosm experiment was designed to quantify the function of the wetland on the depuration of the waters from the Vigario Lake. Such artificial system could significantly remove biochemical oxygen demand in 84%, total and thermotolerant coliforms in 94% and 87% respectively, dissolved and total nutrients from the waters coming from the Vigario Lake. For the removal of ammonium and dissolved phosphorus, the presence of aquatic macrophytes was mandatory in the system. Key words: constructed wetlands; lakes; nitrogen; nutrients; phosphorus; wetlands.

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Treatment of wastewater by natural systems

Cited by 66 publications

References 7 publications

Bioremediation of brewery wastewater using hydroponics planted with vetiver grass in Addis Ababa, Ethiopia

Bioremediation of brewery wastewater using hydroponics planted with vetiver grass in Addis Ababa, Ethiopia

Efficiency of constructed wetlands in decontamination of water polluted by heavy metals

A importância de um alagado para a qualidade da água em um ecossistema urbano impactado por resíduos domésticos

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