Short tests to couple N 2 O emission mitigation and nitrogen removal strategies for landfill leachate recirculation

Wu, Dong; Chao, Wang; Dolfing, Jan

doi:10.1016/j.scitotenv.2015.01.021

Cited by 7 publications

(1 citation statement)

References 38 publications

(38 reference statements)

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“…Landfill leachates were sampled from the leachate collection pipes of the subject landfill lifts, the composition of pretreated refuse and leachates is listed in Table 2. NH 3 -N in these leachate samples were precipitated by MPA methods as described before45, and replaced with the equivalent of NO 3 − , N (450 mg-N/L, Table 2). …”

Section: Methodsmentioning

confidence: 99%

Change in microbial community in landfill refuse contaminated with antibiotics facilitates denitrification more than the increase in ARG over long-term

Chen

Zhang

et al. 2017

Sci Rep

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In this study, the addition of sulfamethazine (SMT) to landfill refuse decreased nitrogen intermediates (e.g. N2O and NO) and dinitrogen (N2) gas fluxes to <0.5 μg-N/kg-refuse·h−1, while the N2O and N2 flux were at ~1.5 and 5.0 μg-N/kg-refuse·h−1 respectively in samples to which oxytetracycline (OTC) had been added. The ARG (antibiotic resistance gene) levels in the refuse increased tenfold after long-term exposure to antibiotics, followed by a fourfold increase in the N2 flux, but SMT-amended samples with the largest resistome facilitated the denitrification (the nitrogen accumulated as NO gas at ~6 μg-N/kg-refuse·h−1) to a lesser extent than OTC-amended samples. Further, deep sequencing results show that long-term OTC exposure partially substituted Hyphomicrobium, Fulvivirga, and Caldilinea (>5%) for the dominant bacterial hosts (Rhodothermus, ~20%) harboring nosZ and norB genes that significantly correlated with nitrogen emission pattern, while sulfamethazine amendment completely reduced the relative abundance of the “original inhabitants” functioning to produce NOx gas reduction. The main ARG carriers (Pseudomonas) that were substantially enriched in the SMT group had lower levels of denitrifying functional genes, which could imply that denitrification is influenced more by bacterial dynamics than by abundance of ARGs under antibiotic pressures.

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Section: Methodsmentioning

confidence: 99%

Change in microbial community in landfill refuse contaminated with antibiotics facilitates denitrification more than the increase in ARG over long-term

Chen

Zhang

et al. 2017

Sci Rep

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Perspective of harnessing energy from landfill leachate via microbial fuel cells: novel biofuels and electrogenic physiologies

Wang

Huang

et al. 2015

Appl Microbiol Biotechnol

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Organic carbon, nitrogen, and sulfur are highly concentrated in municipal solid waste (MSW) landfill leachate, which usually frustrates conventional leachate treatment technologies from the perspective of energy costs. Therefore, the possibility of converting leachate to a new energy source via microbial fuel cell (MFC) technology has been examined recently. This paper summarizes the power output and energy recovery efficiency of the leachate-fed MFCs according to different feeding patterns, cell structures, and loading rates. Also, we assess potential energy-generating chemicals in leachate like nitrogen and sulfur compounds and propose alternative pathways, which may lift strict ratios between organic carbon and nitrogen content in conventional denitrification of leachate and are expected to achieve a higher voltage than traditional organic-oxygen based cells. Although currently power output of leachate-fed MFCs is limited, it seems well possible that dynamic characteristics of MSW leachates and microbial physiologies underlying some bio-electrochemically efficient activities (e.g., direct interspecies electron transfer) could be stimulated in MFC systems to improve the present status.

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Effects of oxygen and carbon content on nitrogen removal capacities in landfill bioreactors and response of microbial dynamics

Wang

et al. 2016

Appl Microbiol Biotechnol

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In this study, landfill bioreactors were tested to treat the recalcitrant leachate-nitrogen and the impacts of relevant operational parameters on its conversion were comprehensively investigated. We found that the highly diverse microbial community in landfill bioreactors could be substantially affected by increasing biodegradable carbon and oxygen content, which led to the whole system's intrinsic nitrogen removal capacity increasing from 50 to 70 %, and meanwhile, the contribution of anammox was detected less than 20 %. The sequencing and q-PCR results showed that microbial community in bioreactor was dominated by Proteobacteria (∼35 %) and Acidobacteria (~20 %) during the whole experiment. The abundance of anammox functioning bacteria (Amx) kept at a stable level (-2.5 to -2.2 log (copies/16S rRNA)) and was not statistically correlated to the abundance of anammox bacteria. However, significant linear correlation (p < 0.05) was determined between the abundance of nirS and Proteobacteria; amoA and AOB. Redundancy analysis (RDA) suggested that although oxygen and biodegradable carbon can both impose effects on microbial community structure, only biodegradable carbon content is the determinant in the total nitrogen removal.

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Short tests to couple N 2 O emission mitigation and nitrogen removal strategies for landfill leachate recirculation

Cited by 7 publications

References 38 publications

Change in microbial community in landfill refuse contaminated with antibiotics facilitates denitrification more than the increase in ARG over long-term

Change in microbial community in landfill refuse contaminated with antibiotics facilitates denitrification more than the increase in ARG over long-term

Perspective of harnessing energy from landfill leachate via microbial fuel cells: novel biofuels and electrogenic physiologies

Effects of oxygen and carbon content on nitrogen removal capacities in landfill bioreactors and response of microbial dynamics

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