Treatment of municipal landfill leachate using a combined anaerobic digester and activated sludge system

Kheradmand, S.; Karimi-Jashni, Ayoub; Sartaj, Majid

doi:10.1016/j.wasman.2010.01.021

Cited by 107 publications

(43 citation statements)

References 22 publications

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“…Maximum COD removal efficiencies were 80% and 75.8% for attached and suspended growth, respectively. These results were consistent with the Kheradmand et al study [15] and Amin et al [16]. Amin et al studied a complementary treatment of leachate using a sequencing batch reactor (SBR).…”

Section: Methodssupporting

confidence: 89%

Investigating Activated Sludge Microbial Population Efficiency in Heavy Metals Removal from Compost Leachate

Farrokhi¹,

Naimi-Joubani²,

Dargahi³

et al. 2018

Pol. J. Environ. Stud.

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Solid waste production has increased in recent years. Many studies have shown that generated leachate from solid waste contains a high concentration of heavy metals. Their removal efficiency from leachate was investigated in aerobic suspended and attached growth systems in lab-scale within 72 hours of aeration. All of the materials used were analytical grade (Merck). Maximum efficiency of the attached growth system in removal of BOD 5 and COD was, respectively, 80% and 78.28%. Maximum removal efficiency for both attached and suspended growth was related to lead, and minimum removal efficiency was related to vanadium for the attached growth, and cadmium for suspended growth. Heavy metals removal efficiencies in attached growth from max to min were lead, iron, manganese, cobalt, zinc, mercury, magnesium, copper, chromium, nickel, cadmium, and vanadium, respectively; and the removal efficiencies for suspended growth from max to min were lead, manganese, iron, zinc, copper, magnesium, cobalt, mercury, chromium, nickel, vanadium, and cadmium, respectively. Generally it can be concluded that both systems are suitable for young leachate treatment, but to satisfy environmental discharge standards post treatment will be necessary.

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Section: Methodssupporting

confidence: 89%

Investigating Activated Sludge Microbial Population Efficiency in Heavy Metals Removal from Compost Leachate

Farrokhi¹,

Naimi-Joubani²,

Dargahi³

et al. 2018

Pol. J. Environ. Stud.

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“…landfill is of intermediate age, it is beginning or is in the methanogenic stage, transforming the VFAs into methane and carbon dioxide (Renou et al, 2008;Kheradmand et al, 2010;Rivera-Laguna et al, 2013). However, although the content of organic matter, expressed as COD, is high, the BOD 5 /COD ratio is low, which indicates the decreased biodegradability of the leachates with age and coincides with what has been found by authors including Fátima et al (2012) and Ramírez-Sosa et al, (2013).…”

Section: Resultsmentioning

confidence: 99%

Determination of leachate toxicity through acute toxicity using Daphnia pulex and Anaerobic Toxicity Assays

Lozada

Rivera

2017

ing.inv.

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The municipal solid waste (MSW) of large cities, in particular the ones of developing countries, is mainly disposed in landfills (LFs), whose inadequate management generates the emission of greenhouse gases and the production of leachates with high concentrations of organic and inorganic matter and, occasionally heavy metals. In this study, the toxicity of the leachates from an intermediate-age municipal landfill was evaluated by ecotoxicity and anaerobic toxicity tests. The acute toxicity assays with Daphnia pulex presented a toxic unit (TU) value of 49,5%, which indicates that these leachates should not be directly discharged into water sources or percolate into the soil because they would affect the ecosystems related to these waters. According to statistical analyses, the leachate toxicity is mainly associated with the inorganic fraction, having the chlorides, calcium hardness and, calcium as the greatest influences on the toxicity. The anaerobic toxicity test showed that in the exposure stage, the methanogenic activity exceeded the control one, which suggests that the anaerobic bacteria easily adapted to the leachate. Therefore, this treatment could be an alternative to mitigate the toxicity of the studied leachates. The inhibition presented in the recovery stage, represented by a reduction of the methanogenic activity, may be because the amount of supplied substrate was not enough to fulfill the carbon and nutrient requirements of the bacterial population present.Keywords: Daphnia pulex, leachate, municipal landfill, anaerobic toxicity. RESUMENLos residuos sólidos municipales (RSM) de las grandes urbes, en particular las de países en desarrollo, son predominantemente arrojados en rellenos sanitarios (RS), cuyo manejo inadecuado genera la emisión de gases de efecto invernadero y la producción de lixiviados con altas concentraciones de materia orgánica e inorgánica y, ocasionalmente, de metales pesados. En este estudio se evaluó la toxicidad de los lixiviados de un relleno sanitario municipal de edad intermedia, mediante ensayos de ecotoxicidad y de toxicidad anaerobia. Los ensayos de toxicidad aguda con Daphnia pulex presentaron valores de UT de 49,5%, lo que indica que estos no deben ser vertidos directamente a fuentes de agua ni deben percolar en el suelo, pues afectarían los ecosistemas que se sirvan de estas aguas. De acuerdo con los análisis estadísticos, la toxicidad del lixiviado está asociada principalmente a la fracción inorgánica, siendo los cloruros, la dureza cálcica y el calcio los parámetros de mayor influencia. Los ensayos de toxicidad anaerobia mostraron que en la etapa de exposición la actividad metanogénica superó a la del control, lo que sugiere que las bacterias anaerobias se adaptaron fácilmente al lixiviado y, por lo tanto, esta puede ser una alternativa de tratamiento para mitigar la toxicidad de los lixiviados estudiados. La inhibición presentada en la etapa de recuperación, representada en una reducción de la actividad metanogénica, puede deberse a que la cantidad de sustrat...

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“…The most important process control parameters for anaerobic treatment are pH and alkalinity 22 . In the present study, the pH of the raw MWW in range 7.2-9.2 and it adjusted during treatment to pH 7.2.…”

Section: Methodsmentioning

confidence: 99%

Treatment of milk wastewater using up-flow anaerobic packed bed reactor

Bhuyar

Suke

Dawande

2015

Polish Journal of Chemical Technology

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An up-fl ow anaerobic packed bed (UAPB) bioreactor has been designed on a laboratory-scale and used for treatment of domestic milk wastewater (MWW). The UAPB bioreactor was operated under mesophilic temperature (37-45 o C) and reactor performance evaluated at various organic loading rates of MWW effl uent at hydraulic retention times (HRT) of 1, 2, and 3 d based on the removal of organic matter COD, BOD, SS, pH changes and biogas production. The kinetic parameters were estimated using the experimental data to develop a reactor model. Empirical relations were generated for the characteristics like COD, BOD, and SS using modeling equations. This study proved that the UAPB reactor performance is excellent for treating domestic MWW and easily biodegradable dairy wastewater infl uent. Hence, this system can operate at low costs, making it suited for use in the developing countries and rural areas.

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Treatment of municipal landfill leachate using a combined anaerobic digester and activated sludge system

Cited by 107 publications

References 22 publications

Investigating Activated Sludge Microbial Population Efficiency in Heavy Metals Removal from Compost Leachate

Investigating Activated Sludge Microbial Population Efficiency in Heavy Metals Removal from Compost Leachate

Determination of leachate toxicity through acute toxicity using Daphnia pulex and Anaerobic Toxicity Assays

Treatment of milk wastewater using up-flow anaerobic packed bed reactor

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