Monitoring transitory profiles of leachate humic substances in landfill aeration reactors in mesophilic and thermophilic conditions

Tong, Huanhuan; Yin, Ke; Ge, Liya; Giannis, Apostolos; Chuan, Valerie W.L.; Wang, Jing‐Yuan

doi:10.1016/j.jhazmat.2015.01.049

Cited by 20 publications

(7 citation statements)

References 51 publications

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“…The dark color observed, with high values of apparent color, between 3,000 CU and 4,000 CU, may be associated with the presence of humic substances in the leachate of this old landfill (TONG et al, 2015). However, these values were lower than those reported by Lima et al (2017), who found values between 4,977 mg Pt Co L -1 and 8,197…”

Section: Resultscontrasting

confidence: 56%

Characterization of recalcitrant material in leachate from an old landfill by spectroscopic methods

Monteiro

Barquilha²,

Braga³

2020

REGET

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Landfill sanitary leachate is an effluent with complex characteristics that still presents some challenges for treatment. From the stabilization of the organic matter which occurs over the years in a landfill, the leachate biodegradability decreases, decreasing the biological treatment efficiency. The objective of this research was to identify the characteristics of leachate from an old landfill, located in Curitiba-BR, using conventional and spectroscopic methods. Two collects of raw leachate were carried out at the Curitiba Municipal Landfill in different periods, which were denominated P11 and P12. The analyzes performed were pH, COD, BOD, DOC, color and solids, as well as UV-Vis and fluorescence spectroscopies. The results indicated that the leachate was influenced by precipitation taxes and it is possible to infer that this landfill is in the aging process, since the leachate presented recalcitrant characteristics. The organic matter presented a strong humification degree due to the presence of aromatic substances, such as humic and fulvic acids, indicating that physical-chemical treatment should be applied to this leachate. In addition, the spectroscopic analysis brought additional information, with a quicker and lower reagent consumption than conventional methods. Thus, these spectroscopic techniques can be considered promising tools to monitor the leachate, assist in the identification of the landfill decomposition stage, and subsidize the planning for proper leachate treatment.

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Section: Resultscontrasting

confidence: 56%

Characterization of recalcitrant material in leachate from an old landfill by spectroscopic methods

Monteiro

Barquilha²,

Braga³

2020

REGET

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“…The extraction, separation, and purification methods of humus in broccoli wastes are mainly referred to as the mature technologies in soil research [27,28]. Humus was extracted by NaOH solution and then HA (precipitate) and FA (supernatant) were separated by the acidification with HCl solution.…”

Section: Humification Phenomenon Of Broccoli Waste During Steam Explosion Processmentioning

confidence: 99%

Potential Hydrothermal-Humification of Vegetable Wastes by Steam Explosion and Structural Characteristics of Humified Fractions

Sui

Zhou

et al. 2021

Molecules

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In this work, steam explosion (SE) was exploited as a potential hydrothermal-humification process of vegetable wastes to deconstruct their structure and accelerate their decomposition to prepare humified substances. Results indicated that the SE process led to the removal of hemicellulose, re-condensation of lignin, degradation of the cellulosic amorphous region, and the enhancement of thermal stability of broccoli wastes, which provided transformable substrates and a thermal-acidic reaction environment for humification. After SE treatment, total humic substances (HS), humic acids (HAs), and fulvic acids (FAs) contents of broccoli samples accounted for up to 198.3 g/kg, 42.3 g/kg, and 166.6 g/kg, and their purification were also facilitated. With the increment of SE severity, structural characteristics of HAs presented the loss of aliphatic compounds, carbohydrates, and carboxylic acids and the enrichment of aromatic structures and N-containing groups. Lignin substructures were proved to be the predominant aromatic structures and gluconoxylans were the main carbohydrates associated with lignin in HAs, both of their signals were enhanced by SE. Above results suggested that SE could promote the decomposition of easily biodegradable matters and further polycondensation, aromatization, and nitrogen-fixation reactions during humification, which were conducive to the formation of HAs.

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“…In landfill leachates, HS may represent 50% to 90% of the total organic carbon (TOC) concentration . In addition to their recalcitrance and structural stability, HS are the main contributors to leachate colouration.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to their recalcitrance and structural stability, HS are the main contributors to leachate colouration. They can lead to complex metals and pesticides, hydrocarbons complexation, and have the potential to be toxic . Hence, HS become a concern in the treatment of leachates when conventional biological processes cannot degrade these substances …”

Section: Introductionmentioning

confidence: 99%

Supercritical water oxidation treatment of humic acid as a model organic compound of landfill leachate

et al. 2020

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Landfill leachate is a complex and variable effluent, rich in organic and inorganic matters resistant to decomposition, and is an extreme pollutant. Humic acids (HA) are some of the most refractive substances in the leachates, which is the reason why they have been used as an organic model. The degradation of an HA solution through supercritical water oxidation (ScWO) was evaluated under a constant pressure of 22.5 MPa, temperatures from 400°C to 600°C, and reaction times from 15 to 60 seconds. The results showed that the most influential factor was temperature and it guided the operational conditions of the ScWO for the landfill leachate (22.5 MPa, 600°C, and 60 seconds). The landfill leachate treatment promoted high removal rates of true colour (87%), total dissolved solids (94%), nitrate (70%), and total phosphorus (96%). In addition, it removed 57% of the COD, which was similar to the HA removal rate (61%) under the same operational conditions. This indicates that HA are an adequate organic model for landfill leachates. The results suggest that ScWO is a clean and promising treatment technology that can be applied to landfills and can have even better results if used in combination with oxidizers and catalysts, or with the use of higher temperatures.

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Monitoring transitory profiles of leachate humic substances in landfill aeration reactors in mesophilic and thermophilic conditions

Cited by 20 publications

References 51 publications

Characterization of recalcitrant material in leachate from an old landfill by spectroscopic methods

Characterization of recalcitrant material in leachate from an old landfill by spectroscopic methods

Potential Hydrothermal-Humification of Vegetable Wastes by Steam Explosion and Structural Characteristics of Humified Fractions

Supercritical water oxidation treatment of humic acid as a model organic compound of landfill leachate

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