Treatment of old landfill leachate with high ammonium content using aerobic granular sludge

Ren, Yongsheng; Ferraz, Fernanda; Kang, Abbass Jafari; Yuan, Qiuyan

doi:10.1186/s13036-017-0085-0

Cited by 32 publications

(7 citation statements)

References 27 publications

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“…were comparable with those achieved in previous studies with simulated and real industrial wastewaters [17,[29][30][31], landfill leachates [11,32] and different anaerobic digestates: in particular, Cydzik-Kwiatkowska et al [14] reported SVI 5 values within the range of 25-30 mL g TSS −1 in a GSBR treating diluted and undiluted anaerobic digester supernatant at different cycle lengths (6, 8, 12 h); Świątczak et al [6] reported SVI of about 50 mL g MLSS −1…”

Section: Resultssupporting

confidence: 87%

Aerobic granular sludge formation in a sequencing batch reactor treating agro-industrial digestate

Carucci

Cappai

Erby

et al. 2020

Environmental Technology

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Most of nitrogen emissions can be ascribed to agro-industrial activities. Since digestate produced by fermentation of agro-industrial residues can be difficult to dispose of due to its high ammonium content, advanced technical-and cost-effective technologies must be developed and applied in order to significantly reduce its impact on the environment. In this study, aerobic granules were successfully cultivated in a granular sludge sequencing batch reactor (GSBR) fed with the ammonium-rich (approx. 2500 mg L −1 ) effluent of a 3-stage anaerobic digester treating agro-industrial residues. The peculiar characteristics of such wastewater required a 2-step operating strategy aimed at the selection of nitrifying biomass (Step 1) and the formation of aerobic granular sludge (Step 2). During Step 1, nitrifying biomass selection was achieved by properly regulating the cycle length: NH + 4 -N removal rates progressively increased from 42 to 109 mg N L −1 d −1 , and a corresponding increase in NH + 4 -N specific removal rates from 8 to 24 mg N g VSS −1 d −1 was also observed. During Step 2, the increase in selective pressures (i.e. minimum settling velocity and volumetric organic loading rate) led to the formation of compact (average diameter, 1.02 ± 0.43 mm) and well-settling granules (SVI 5 , 28.6 ± 3.8 mL g TSS −1 ), which were able to remove up to 89 ± 2% of organic matter (as COD), 79 ± 3% of NH + 4 -N and 59 ± 4% of nitrogen (as a sum of NH + 4 -N, NO -2 -N and NO -3 -N). The 2-step operating strategy played a key role in biomass selection and subsequent granule formation and maintenance in the GSBR, and may be successfully adopted for the treatment of different ammonium-rich wastewaters.

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Section: Resultssupporting

confidence: 87%

Aerobic granular sludge formation in a sequencing batch reactor treating agro-industrial digestate

Carucci

Cappai

Erby

et al. 2020

Environmental Technology

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“…The decrease in the ammonium nitrogen removal rate with the lengthening of the GSBR working cycle (r = 1.00) and a resulting decrease in the load of organics indicates that ammonium nitrogen removal was due to the activity of heterotrophic microorganisms. The ammonium removal rates were over two times and seven times greater than the rates observed during the treatment of landfill leachate with a low COD/N ratio in granular sludge batch reactors and activated sludge batch reactors, respectively [31]. Regardless of the length of the cycle, complete removal of ammonium nitrogen was observed after approximately 6 h of the cycle.…”

Section: Gsbr Operationmentioning

confidence: 73%

Treatment of Liquid Phase of Digestate from Agricultural Biogas Plant in a System with Aerobic Granules and Ultrafiltration

Świątczak

Cydzik‐Kwiatkowska

Zielińska

2019

Water

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Management of digestate from manure co-digestion with a very high chemical oxygen demand (COD) to nitrogen ratio and high nitrogen loads are a major bottleneck in the development of agricultural biogas plants. The liquid phase of digestate mixed with municipal wastewater was treated in aerobic granular sludge batch reactors at cycle lengths (t) of 6 h (GSBR6h), 8 h (GSBR8h), and 12 h (GSBR12h), corresponding to nitrogen loads of 1.6, 1.2, and 0.8 g/(L·d). Thauera sp., Lacibacter sp., Thermanaerothrix sp., and Planctomyces sp. predominated in granules favoring effective granule formation and nitrogen removal. Increasing cycle lengths (t) significantly decreased proteins in soluble fraction of extracellular polymeric substances (EPS) in granules and increased polysaccharides in tightly bound EPS that resulted in higher granule diameters and higher COD removal. In GSBR6h, heterotrophic nitrification/denitrification was very efficient, but ammonium was fully oxidized in the last hour of the cycle. So in further studies, the effluent from GSBR8h was subjected to ultrafiltration (UF) at transmembrane pressures (TMPs) of 0.3, 0.4, and 0.5 MPa. A GSBR8h-UF system (TMP of 0.4 MPa) ensured full removal of total Kjeldahl nitrogen (TKN), suspended solids, and substantial reduction of COD and color with good permeate flux. The NOx-rich (about 250 mg/L), clear permeate can be reused in line with assumptions of modern circular economy.

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“…Although the successful treatment of landfill leachate by both conventional and granular AS has been reported in the literature [11][12][13], the number of reports that stress the negative impact of this effluent on the sludge performance is definitely higher [14][15][16][17][18][19]. Because the AS process often cannot achieve an effective reduction of the chemical oxygen demand (COD) and total nitrogen in effluents contaminated with landfill leachate, this technology should be further improved in order to cope with the complex mixture of compounds as well as the fluctuations in the environmental factors associated with this type of wastewater.…”

Section: Introductionmentioning

confidence: 99%

Selecting Bacteria Candidates for the Bioaugmentation of Activated Sludge to Improve the Aerobic Treatment of Landfill Leachate

Michalska

Piński

Żur

et al. 2020

Water

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In this study, a multifaceted approach for selecting the suitable candidates for bioaugmentation of activated sludge (AS) that supports leachate treatment was used. To determine the exploitation of 10 bacterial strains isolated from the various matrices for inoculating the AS contaminated with the Kalina pond leachate (KPL), their degradative potential was analyzed along with their aptitude to synthesize compounds improving remediation of pollutants in wastewater and ability to incorporate into the AS flocs. Based on their capability to degrade aromatic compounds (primarily catechol, phenol, and cresols) at a concentration of 1 mg/mL and survive in 12.5% of the KPL, Pseudomonas putida OR45a and P. putida KB3 can be considered to be the best candidates for bioaugmentation of the AS among all of the bacteria tested. Genomic analyses of these two strains revealed the presence of the genes encoding enzymes related to the metabolism of aromatic compounds. Additionally, both microorganisms exhibited a high hydrophobic propensity (above 50%) and an ability to produce biosurfactants as well as high resistance to ammonium (above 600 µg/mL) and heavy metals (especially chromium). These properties enable the exploitation of both bacterial strains in the bioremediation of the AS contaminated with the KPL.

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Treatment of old landfill leachate with high ammonium content using aerobic granular sludge

Cited by 32 publications

References 27 publications

Aerobic granular sludge formation in a sequencing batch reactor treating agro-industrial digestate

Aerobic granular sludge formation in a sequencing batch reactor treating agro-industrial digestate

Treatment of Liquid Phase of Digestate from Agricultural Biogas Plant in a System with Aerobic Granules and Ultrafiltration

Selecting Bacteria Candidates for the Bioaugmentation of Activated Sludge to Improve the Aerobic Treatment of Landfill Leachate

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