Denitrification of low C/N landfill leachate in lab-scale landfill simulation bioreactors

Cerminara, Giulia; Raga, Roberto; Hirata, Osamu; Pivato, Alberto

doi:10.1016/j.wasman.2020.05.041

Cited by 16 publications

(3 citation statements)

References 28 publications

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“…Heterotrophic denitrification, which utilizes organic carbon sources as electron donors, has higher denitrification rates compared with autotrophic denitrification [4]. However, the deficiency of available carbon sources is an intractable problem for heterotrophic denitrification in the treatment of wastewater with low carbon to nitrogen (C/N) ratio such as wastewater treatment plants (WWTP) effluent, rural sewage, farmland recession, landfill leachate, and industrial effluents [5][6][7][8], etc. Conventionally, liquid carbon sources as methanol, ethanol and acetic acid are applied in the treatment of low C/N ratio wastewater to ensure sufficient electron donors for the denitrification process [9].…”

Section: Introductionmentioning

confidence: 99%

Release Mechanism, Secondary Pollutants and Denitrification Performance Comparison of Six Kinds of Agricultural Wastes as Solid Carbon Sources for Nitrate Removal

Ling

Yan

Wang

et al. 2021

IJERPH

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Agricultural wastes used as denitrification carbon sources have some drawbacks such as excessive organic carbon release and unclear release characteristics of nitrogen, phosphorus, and chromatic substances, which can cause adverse effects on the effluent quality during the denitrification process. The composition and surface characteristics, carbon release mechanisms, and secondary pollutant release properties of six kinds of agricultural wastes, i.e., rice straw (RS), wheat straw (WS), corn stalk (CS), corncob (CC), soybean stalk (SS), and soybean hull (SH) were studied and analyzed in this research. The denitrification performance of these agricultural wastes was also investigated extensively by batch experiments. The results showed that the carbon release basically followed the second-order reaction kinetic equation and Ritger–Peppas equation in the 120 h reaction, and it was mainly controlled by the diffusion process. The kinetic equation fitting results and bioavailability test suggested that the potential risk of excessive effluent COD of CC was the lowest due to the appropriate amount and degradability of its released carbon. The NH4+-N, TN, and TP in the leachate of RS were higher than those of the other five agriculture wastes, and the chroma in the leachate of WS and CS was heavier than that of the others. CC released the lowest pollutants, which resulted in slight fluctuations of effluent quality in the start-up period (1–11 d), and it had the best nitrogen removal capacity in the denitrification experiment. The average NO3−-N removal of CC was 5.12 mg for each batch in the stable period (11–27 d), which was higher than that of others, and less NO2−-N, NH4+-N, and COD were accumulated in the CC effluent during the whole denitrification process.

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Section: Introductionmentioning

confidence: 99%

Release Mechanism, Secondary Pollutants and Denitrification Performance Comparison of Six Kinds of Agricultural Wastes as Solid Carbon Sources for Nitrate Removal

Ling

Yan

Wang

et al. 2021

IJERPH

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“…Other groundwater samples were all negative, with none showing a positive result for the NirS gene (data not shown). The functional role of denitrifiers’ community both in groundwater and landfill leachate environments are complex and very different, as reported in previous studies (Cao et al, 2019 ; Cerminara et al, 2020 ; Heffernan et al, 2012 ; Utom et al, 2020 ). In our study, we can confirm that leachate hosts a denitrifying population that is compatible with a reducing environment in which nitrate can be used as an alternative electron acceptor by denitrifiers.…”

Section: Resultsmentioning

confidence: 82%

Microbial, chemical, and isotopic monitoring integrated approach to assess potential leachate contamination of groundwater in a karstic aquifer (Apulia, Italy)

Beneduce,

Piergiacomo,

Limoni

et al. 2024

Environ Monit Assess

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Landfill sites are subjected to long-term risks of accidental spill of leachate through the soil and consequential contamination of the groundwater. Wide areas surrounding the landfill can seriously be threatened with possible consequences to human health and the environment. Given the potential impact of different coexisting anthropic pollution sources (i.e., agriculture and cattle farming) on the same site, the perturbation of the groundwater quality may be due to multiple factors. Therefore, it is a challenging issue to correctly establish the pollution source of an aquifer where the landfill is not isolated from other anthropic land uses, especially in the case of a karstic coastal aquifer. The present study is aimed at setting in place an integrated environmental monitoring system that included microbiological, chemical, and isotope methods to evaluate potential groundwater pollution in a landfill district in the south of Italy located in Murgia karstic aquifer. Conventional (microbial plate count and physical–chemical analyses) and advanced methods (PCR-ARISA, isotope analysis of δ18O, δ2H, 3H, δ 13C, δ 15N-NO3−, and δ 18O-NO3−) were included in the study. Through data integration, it was possible to reconstruct a scenario in which agriculture and other human activities along with seawater intrusion in the karst aquifer were the main drivers of groundwater pollution at the monitored site. The microbiological, chemical, and isotope results confirmed the absence of leachate effects on groundwater quality, showing the decisive role of fertilizers as potential nitrate sources. The next goal will be to extend long-term integrated monitoring to other landfill districts, with different geological and hydrogeological characteristics and including different sources of pollution, to support the ecological restoration of landfills.

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“…Due to its persistence under anaerobic conditions, ammonia nitrogen can be present in high concentrations in leachate from old landfills. [ 51 ] The high measured values were the result of the combination of leachates from the active and the already disposal zones in the equalization pond. Figure 4C illustrates the variation in the concentrations of total ammonia nitrogen (TAN) recorded over the course of the experiments.…”

Section: Resultsmentioning

confidence: 99%

Organic matter and nutrients removal from landfill leachate by airlift aerobic three‐phase fluidized bed reactor

Pantoja‐Quiroz,

Burbano‐Moreno,

Sánchez Ortiz

2023

CLEAN Soil Air Water

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The treatment of leachate from the Antanas Landfill in the municipality of Pasto, Colombia, was evaluated by means of aerobic three‐phase airlift fluidized bed reactors with internal circulation (ATPAFBRWIC) with an external and internal diameter ratio of 2 and an individual effective volume of 53 L. Silica sand was used as a carrier at a concentration of 104 g L−1, and the reactors were operated with hydraulic retention times (HRT) of 1, 2 and 4 h. For a period of 45 days, the following parameters were monitored at the influent and effluent of the reactors: biochemical oxygen demand (BOD), chemical oxygen demand (COD), total phosphorus (TP), total ammonia nitrogen (TAN), total Kjeldahl nitrogen, nitrites and nitrates, where the respective average concentrations recorded in the influent were 4225.9, 7115.2, 14.1, 1664.1, 1591.1, 0.41, and 31.8 mg L−1. The best performance in the removal of organic matter and nutrients was recorded for a 2‐h HRT, with average removal efficiency of 52.9% for BOD and 26.8% for COD, and 52.5, 5.6, and 56.2% for TP, TAN, and nitrates, respectively. The low volumes required for ATPAFBRWIC suggest their potential use as compact leachate treatment units.

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Denitrification of low C/N landfill leachate in lab-scale landfill simulation bioreactors

Cited by 16 publications

References 28 publications

Release Mechanism, Secondary Pollutants and Denitrification Performance Comparison of Six Kinds of Agricultural Wastes as Solid Carbon Sources for Nitrate Removal

Release Mechanism, Secondary Pollutants and Denitrification Performance Comparison of Six Kinds of Agricultural Wastes as Solid Carbon Sources for Nitrate Removal

Microbial, chemical, and isotopic monitoring integrated approach to assess potential leachate contamination of groundwater in a karstic aquifer (Apulia, Italy)

Organic matter and nutrients removal from landfill leachate by airlift aerobic three‐phase fluidized bed reactor

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