Comparing young landfill leachate treatment efficiency and process stability using aerobic granular sludge and suspended growth activated sludge

Ren, Yongsheng; Ferraz, Fernanda; Lashkarizadeh, Monireh; Yuan, Qiuyan

doi:10.1016/j.jwpe.2017.04.006

Cited by 60 publications

(26 citation statements)

References 31 publications

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“…The ratio of BCOD to COD evaluated with the allochthonous biomass was approximately 40%, which was in agreement with those reported for a young leachate [23]. The ratio evaluated with the autochthonous biomass was approximately 76±1.9 %, which was much higher than the typical values observed in the literature for young leachates [8,24]. Thus, the results confirmed that the biodegradability of complex organic substrates is strictly related to the bacterial consortium operating the biodegradation.…”

Section: Biodegradability Of Leachatesupporting

confidence: 90%

“…As far as we are aware, no studies in the literature report values of the BOD/COD ratio higher than 0.3 -0.4 for young leachate [3,14]. In contrast, the amount of biodegradable COD achieved in this study with the autochthonous biomass was >70% whereas those with the allochthonous biomass were close to 40%, thus comparable with the results reported for young leachate [24]. These findings demonstrated that the same leachate has different biodegradability characteristics dependent on the biomass used to perform the BOD test.…”

Section: General Considerations and Potential Applicationssupporting

confidence: 84%

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Assessment of landfill leachate biodegradability and treatability by means of allochthonous and autochthonous biomasses

et al. 2020

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The biodegradability and treatability of a young (3 years old) municipal landfill leachate was evaluated by means of chemical oxygen demand (COD) fractionation tests, based on respirometric techniques. The tests were performed using two different biomasses: one cultivated from the raw leachate (autochthonous biomass) and the other collected from a conventional municipal wastewater treatment plant after its acclimation to leachate (allochthonous biomass). The long term performances of the two biomasses were also studied. The results demonstrated that the amount of biodegradable COD in the leachate was strictly dependent on the biomass that was used to perform the fractionation tests. Using the autochthonous biomass, the amount of biodegradable organic substrate resulted in approximately 75% of the total COD, whereas it was close to 40% in the case of the allochthonous biomass, indicating the capacity of the autochthonous biomass to degrade a higher amount of organic compounds present in the leachate. The autochthonous biomass was characterized by higher biological activity and heterotrophic active fraction (14% vs 7%), whereas the activity of the allochthonous biomass was significantly affected by inhibitory compounds in the leachate, resulting in a lower respiration rate (SOUR = 13 mg O2 gVSS-1 h-1 vs 37 mg O2 gVSS-1 h-1). The long-term performance of the autochthonous and allochthonous biomasses indicated that the former was more suitable for the treatment of raw landfill leachate, ensuring higher removal performance towards the organic pollutants.

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Section: Biodegradability Of Leachatesupporting

confidence: 90%

Section: General Considerations and Potential Applicationssupporting

confidence: 84%

Assessment of landfill leachate biodegradability and treatability by means of allochthonous and autochthonous biomasses

et al. 2020

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“…It was intuitively confirmed, in particular, that the difference in removal efficiency between C/N ratios 5.0 and 10.0 was large, and this tended to be stabilized under C/N ratio of 10.0 and greater [55][56][57]. Kocaturk and Erguder [24] reported that the organic material removal efficiencies were kept over 90% under the conditions of higher C/N ratio (10,20, and 30) and kept low under the lower C/N ratio, consistent with the results of this study.…”

Section: Reactor Performancementioning

confidence: 86%

“…The aerobic granular sludge (AGS), compared to traditional activated sludge, has more excellent characteristics in terms of regular shape and compact structure, sedimentation, biomass accumulation, resistance to toxic compounds and high organic load, and removal efficiency of nutrient salts [5][6][7][8]. These made the AGS technique made to be widely used in treatments of high-load industrial wastewater as well as sewage [9][10][11][12]. The stability of AGS is the most important issue in applying AGS-based process in various fields and is related many factors including the composition of influent wastewater, carbon to nitrogen (C/N) ratio, food to microorganisms (F/M) ratio, composition of extracellular polymeric substances (EPS), and rate and temperature of aeration [4,8,[13][14][15][16][17], among which, the C/N ratio of influent water is one of the most important factors for the growth of microorganism and biodegradation of nutrient salt [13,[18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Effects of carbon to nitrogen ratio on the performance and stability of aerobic granular sludge

Kim

Ahn

2020

Environmental Engineering Research

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The purpose of this study was to assess the nutrient salts removal efficiency and stability of the aerobic granular sludge (AGS) by change in C/N (carbon to nitrogen) ratio. The laboratory-scale experiments were performed to analyze the removal efficiencies for organic matter and contents of nitrogen, MLSS, sludge volume index, and extracellular polymeric substances (EPS) under C/N ratio conditions of 5.0, 10.0, 15.0, and 20.0. The microorganisms were observed using optical microscope and the microbial communities were analyzed using pyrosequencing. The increase in C/N ratio from 5.0 to 20.0 increased the organic matter and nitrogen removal efficiency to 95.9 and 79.1%, respectively. For the EPS contents, an influencing factor of granule stability, the polysaccharides to protein (PS/PN) ratio increased from 0.55 to 0.79. For the microbial community, the <i>Thauera</i> was the most common genus in ending phase occupying 63.7%. This microorganism is regarded as one contributing to organic matter degradation and improved production of EPS including AGS of microorganism, thus, may be an explanation of the results of this study such as increase in organic material in AGS and improvement of denitrification efficiency and contents of EPS with increase in C/N ratio.

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“…La acumulación de los desechos y la percolación de aguas lluvias a través de estos genera lixiviados de diversa composición que incluyen sales inorgánicas, metales pesados -MP-, niveles elevados de nitrógeno amoniacal total -NAT-, materia orgánica -MO-y compuestos orgánicos xenobióticos (Ren, Ferraz, Lashkarizadeh, & Yuan, 2017).…”

Section: Introductionunclassified

Nitrificación en el tratamiento de lodos de lixiviados en un reactor biológico discontinuo secuencial - SBBR

2018

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Los rellenos sanitarios brindan una técnica de disposición y tratamiento efectivo de residuos sólidos los cuales, con la degradación de la materia orgánica y la percolación del agua lluvia, generan lixiviados. Es posible tratar los lodos generados del tratamiento de lixiviados a través de un reactor biológico discontinuo secuencial –SBBR–, que oxida el sustrato y favorece la degradación y nitrificación. El estudio tiene como objetivo el tratamiento biológico a los lodos de lixiviado del Relleno Sanitario Doña Juana, Bogotá D. C.-Colombia, por medio de un SBBR, para lograr la reducción de los impactos ambientales. Se empleó un sistema piloto, con 10 recambios de lodo (uno por semana) en 70 días. El sistema de aireación fue controlado por medio de parámetros como pH, temperatura y oxígeno disuelto que determinaron la correcta actividad biológica. Se logró una disminución del 40 % del nitrógeno total en la mezcla de lodo final, y para el clarificado final, una reducción de DBO en 99,6 % y DQO en 98 %. Ello conduce a concluir que el proceso biológico con la incorporación de la aireación extendida permite la mitigación de la carga contaminante.

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Comparing young landfill leachate treatment efficiency and process stability using aerobic granular sludge and suspended growth activated sludge

Cited by 60 publications

References 31 publications

Assessment of landfill leachate biodegradability and treatability by means of allochthonous and autochthonous biomasses

Assessment of landfill leachate biodegradability and treatability by means of allochthonous and autochthonous biomasses

Effects of carbon to nitrogen ratio on the performance and stability of aerobic granular sludge

Nitrificación en el tratamiento de lodos de lixiviados en un reactor biológico discontinuo secuencial - SBBR

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