The effect of calcium on the treatment of fresh leachate in an expanded granular sludge bed bioreactor

Liu, Jianyong; Hu, Jun; Zhong, Jiangping; Luo, Jing; Zhao, Aihua; Liu, Feng; Hong, Ruijing; Qian, Guangren; Xu, Zhi Ping

doi:10.1016/j.biortech.2010.11.056

Cited by 41 publications

(19 citation statements)

References 40 publications

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“…Van Langerak et al (1988) observed that the optimal Ca ion concentration for development of methanogenic sludge in an up-flow anaerobic sludge bioreactor (UASB) was 1200 mg/L and that unstable COD removal efficiency occurred at a higher Ca concentration. A similar inhibition result was observed by Liu (2011) when Ca concentration in excess of 1800 mg/L caused a decrease in COD removal in the reactor. Dang et al (2014) researched the performance of an expanded granular sludge bioreactor treating leachate from a MSW incineration plant and found that the Ca suppression threshold was 5000 mg/L; the significant difference in this threshold from previous studies was attributed to the strong resistance of the large-scale reactor.…”

Section: Introductionsupporting

confidence: 81%

“…Several studies have focused on the negative effects of high Ca concentrations on the anaerobic treatment of different wastewaters using different sizes of reactors. Due to the strong resistance to Ca inhibition in response to gradual increases in Ca concentration and the acclimation of sludge in large-scale reactors, quite diverse suppression thresholds of Ca concentration have been obtained in previous studies (Dang et al 2014;Kugelman and McCarty 1965;Liu 2011;Van Langerak et al 1988;Yu et al 2001). Hence, compared with published research, the results of the BMP experiment in the present study are considered to be reflective of the actual intrinsic suppression threshold of Ca to the anaerobic digestion process and the resulting granular sludge.…”

Section: Discussionmentioning

confidence: 47%

“…The actual Ca concentrations achieved in the leachate were 1008 ± 6, 2424 ± 15, 4556 ± 23, 6407 ± 16, and 8657 ± 1 mg/L. The leachates (250 mL) were added into the serum bottles and inoculated with the anaerobic granular sludge at the rate of 2-g volatile suspended solids (VSS) per liter based on the previous researches (Ahn et al 2006;Dang et al 2014;Liu 2011;Yu et al 2001). The initial pH values were adjusted to 7.15 ± 0.05 using a potassium hydroxide (KOH) solution as required (Barlaz et al 1987), and nitrogen was used to remove the oxygen in the serum bottles.…”

Section: Bmp Experimentsmentioning

confidence: 99%

“…Although the toxicity threshold of the Ca ion for anaerobic digestion of wastewater has been studied in laboratory-scale experiments, few studies have focused on the performance of anaerobic biological treatment of landfill leachate containing extremely high Ca concentrations. It was found that the optimal Ca ion concentration for a positive impact on chemical oxygen demand (COD) removal in anaerobic reactors is between 100 and 300 mg/ L and that an inhibitory effect on biological activity occurs when the Ca ion concentration is more than 2000-2500 mg/L (Dang et al 2014;Hulshoff et al 1983;Kugelman and McCarty 1965;Liu 2011;Van Langerak et al 1988;Yu et al 2001). Kugelman and McCarty (1965) reported that moderate inhibition of acetic acid methanation occurred at Ca concentrations up to 2500 mg/L and that a significant inhibitory effect occurred when Ca concentration was greater than 8000 mg/L.…”

Section: Introductionmentioning

confidence: 98%

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Inhibition effects of high calcium concentration on anaerobic biological treatment of MSW leachate

et al. 2016

Environ Sci Pollut Res

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With the increasing use of municipal solid waste incineration (MSWI) and more stringent limits on landfilling of organic waste, more MSWI bottom ash is being landfilled, and the proportion of inorganic wastes in landfills is increasing, causing the increased Ca concentrations in landfill leachate. In this research, the inhibition effect of Ca concentration on the anaerobic treatment of landfill leachate was studied using a biochemical methane potential experiment. Slight inhibition of methane production occurred when the addition of Ca concentration was less than 2000 mg/L. When the addition of Ca concentration was between 6000 and 8000 mg/L, methane production was significantly reduced (to 29.4-34.8 % of that produced by the BLK reactor), and the lag phase was increased from 8.55 to 16.32 d. Moreover, when the dosage of Ca concentration increased from zero to 8000 mg/L, reductions in solution Ca concentration increased from 929 to 2611 mg/L, and the proportion of Ca in the residual sludge increased from 22.58 to 46.87 %. Based on the results, when the dosage of Ca concentration was less than 4000 mg/L, the formation of Ca precipitates on the surface of sludge appeared to prevent mass transfer and was the dominant reason for the reduction in methane production and sludge biomass. At higher Ca concentrations (6000-8000 mg/L), the severe inhibition of methane production appeared to be caused by the toxic effect of highly concentrated Ca on sludge as well as mass transfer blockage.

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Section: Introductionsupporting

confidence: 81%

Section: Discussionmentioning

confidence: 47%

Section: Bmp Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

Inhibition effects of high calcium concentration on anaerobic biological treatment of MSW leachate

et al. 2016

Environ Sci Pollut Res

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“…In the same way that moderate concentrations of calcium stimulate microbial growth in anaerobic digestion (Tada et al, 2005), excessive amounts lessen the speed of growth and may even can cause a severe inhibition or toxicity in the system (Saifullah et al, 2010) that results in a decrease in the biodegradation process. On the other hand, Liu et al (2011) reported that a high calcium concentration (1600-1800 mg/L) caused a decrease in the methanogenic activity of sludge and the CH 4 production rate. The Ca 2+ ions released in the present study could have a similar effect.…”

Section: Anaerobic Digestion Assessmentmentioning

confidence: 99%

Enhancement of anaerobic digestion of microcrystalline cellulose (MCC) using natural micronutrient sources

Suárez

Nielsen

Köhler

et al. 2014

Braz. J. Chem. Eng.

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-The effect of adding four minerals as micronutrient sources to stimulate the anaerobic process of microcrystalline cellulose (MCC) was investigated. Three mineral doses (5, 10 and 15 mg/L) were evaluated and the response to trace metal addition was monitored by the methane yield (Y CH4 ) and specific methanogenic activity (SMA). A clear stimulation of the Y CH4 and SMA on MCC due to the presence of minerals with a high content of trace elements was observed, respectively: the Y CH4 and SMA of the sludge with 5 mg/L of high-Fe-Mg mineral increased to 397 NmLCH 4 /gVS substrate and 0.267 gCOD NmLCH4 /gVS inoculum /d compared to 303 NmLCH 4 /gVS substrate and 0.205 gCOD NmLCH4 /gVS inoculum/ d in a medium without adding mineral. An increase in the doses of high-Ca mineral highly decreased methane production and process stability, due to a possible inhibition of the anaerobic digestion by calcium ions.

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Effective anaerobic treatment of fresh leachate from MSW incineration plant and dynamic characteristics of microbial community in granular sludge

Dang

et al. 2013

Appl Microbiol Biotechnol

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We investigated the treatment of fresh leachate from municipal solid waste incineration plants with high-strength organics using a lab-scale expanded granular sludge bed (EGSB) reactor. The reactor was operated at a mesophilic temperature (33 °C) for 118 days. The influent chemical oxygen demand (COD) of the leachate gradually increased to over 70,000 mg/L, and the organic loading rate increased to 18 kg COD/(m(3) day). An average COD removal efficiency of 86.7 % was achieved when the reactor was fed with raw leachate, which suggests the feasibility of the EGSB process for leachate treatment. The microbial communities in the sludge from the reactor during the trial operation were constructed by denaturing gradient gel electrophoresis, clone libraries, and real-time quantitative polymerase chain reaction. The dominant group for archaea was Methanosaeta, with 68.4 % proportion at the start of the operation, and then changed to Methanosarcina, with a proportion of 62.3 %, after 118 days of operation. The dominant group of eubacteria was confirmed to be Firmicutes throughout the operation process, with the proportion increasing from >50 to 81.2 %. Almost all the operational taxonomic units of Firmicutes belonged to the order Clostridiales, with characteristic spore formation. The microbial diversity of the population was low under raw leachate as feed in the reactor. The dynamics of the microbial community in the anaerobic granular sludge was discussed relating with the operating status of the EGSB reactor.

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The effect of calcium on the treatment of fresh leachate in an expanded granular sludge bed bioreactor

Cited by 41 publications

References 40 publications

Inhibition effects of high calcium concentration on anaerobic biological treatment of MSW leachate

Inhibition effects of high calcium concentration on anaerobic biological treatment of MSW leachate

Enhancement of anaerobic digestion of microcrystalline cellulose (MCC) using natural micronutrient sources

Effective anaerobic treatment of fresh leachate from MSW incineration plant and dynamic characteristics of microbial community in granular sludge

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