Evolution of nitrogen species in landfill leachates under various stabilization states

Zhao, Renzun; Gupta, Abhinav; Novak, John T.; Goldsmith, C. Douglas

doi:10.1016/j.wasman.2017.07.041

Cited by 19 publications

(4 citation statements)

References 35 publications

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“…Nevertheless, the treated sludge cannot be directly discharged into the environment. Sludge disposal technologies such as landfilling, land application, composting, incineration, and building materials will then be required to prevent adverse effects on the ecological environment [7][8][9]. However, sludge disposal is usually restricted due to the associated disadvantages such as negative environmental impacts, large land occupation, and high energy consumption [10,11].…”

Section: Introductionmentioning

confidence: 99%

Effect of on-Site Sludge Reduction and Wastewater Treatment Based on Electrochemical-A/O Combined Process

Han

Zhou

et al. 2021

Water

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Working on sludge with electrochemical oxidation is beneficial to promote the subsequent recessive growth of microorganisms in the sludge. To achieve the on-site sludge reduction, this study combined the anoxic/oxic (A/O) process with the electrochemical oxidation process based on the cell lysis-cryptic growth theory by determining the experimental conditions and mechanism of electrochemical cell lysis. The sludge reduction and effluent treatment of the combined process in practical operation were studied. The results showed that the cumulative sludge discharge had been reduced by 37.1% compared with that of the A/O process, and the apparent sludge yield had been reduced by 39.1% during the 30-day operation time, indicating that the electrochemical-A/O combined process could have a considerable sludge reduction effect. After the treatment, chemical oxygen demand (COD), ammonium nitrogen, and total nitrogen in the effluent of the combined process reached 33.02 mg/L, 0.83 mg/L, and 9.95 mg/L, respectively. Due to the limitation of the A/O process, the removal of total phosphorus was poor. As a result, poly aluminum chloride (PAC) was employed to achieve a chemical removal of phosphorus, by which the total phosphorus (TP) of the effluent was controlled to be lower than 0.5 mg/L.

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Section: Introductionmentioning

confidence: 99%

Effect of on-Site Sludge Reduction and Wastewater Treatment Based on Electrochemical-A/O Combined Process

Han

Zhou

et al. 2021

Water

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“…Otherwise, in contrast to organic matter, the ammonium concentration does not decrease over time and, even in “mature” leachates, it is possible to observe high concentration of ammonium (Kjeldsen et al, ). This pollutant contributes to the toxicity of leachates and is considered by many authors as a long‐term pollutant in landfills (Biglarijoo et al, ; Dia et al, ; Zhao, Gupta, Novak, & Goldsmith, ).…”

Section: Resultsmentioning

confidence: 99%

Characterization and treatment of landfill leachates by electro‐Fenton process: A case study in Algeria

Rouidi

Maurício

Boukhrissa

et al. 2019

Water Environment Research

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The feasibility of the electro-Fenton (EF) process to improve the biodegradability of Algerian leachates was examined, in order to prepare this kind of flux for conventional biological treatment. This work also included, for the first time in Algeria, the control and monitorization of a landfill-the "Hamici" landfill. Several physicochemical parameters were determined allowing its classification into an intermediate degradation phase, namely considering their alkaline pH (8.7), high ammonium concentration (3,120 mg/L), low content in heavy metals, and biodegradability (BOD 5 / COD = 0.22). The effects of important parameters such as current intensity, treatment time, and temperature on COD removal have been studied and optimized by using response surface analysis of a central composite design, where 91.1% of COD was removed with a treatment time of 285 min, a current intensity of 3 A, and a temperature of 20°C. A biodegradability test, which was performed on a solution electrolyzed with 120 min, 2 A, and 20°C, allowed to improve the leachates biodegradability from 0.2 to 0.42, with a removal rate of COD and TOC of 53.35% and 34.5%, respectively. However, the current efficiency declined from 137% to 76.6% when the current intensity was rise from 0.5 to 2 A. These results showed the relevance of EF process applied on raw intermediate leachates and its possible benefit in the Algiers leachates treatment processes. Thus, it was concluded that biological treatment can be combined with EF process for optimal mineralization of leachates with clear advantages in this studied location. • Practitioner points• Characterization and treatment of leachates by electro-Fenton (EF) process were carried out. • The leachates are intermediate type and therefore biologically recalcitrant. • The operating parameter for EF process were modeled and optimized by the central composite design. • Current intensity of 2 A reduces COD and TOC of 53.35% and 34.5%, respectively. • The ratio BOD 5 /COD increased from 0.2 to 0.42 after 120 min of electrolysis time.

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“…LL can be considered wastewater with a complex composition and many toxic and persistent compounds [3]. Their composition depends on many factors, such as the landfill age, climatic conditions, rainfall intensity, and the presence of toxic/biorefractory wastes in the landfill [4][5][6][7]. Because of the high variability of the flow and type of pollutants in LL, the traditional activated sludge reactors used in typical wastewater treatment plants are not efficient enough [4] for it.…”

Section: Introductionmentioning

confidence: 99%

Treatment of Landfill Leachates with Combined Acidification/Coagulation and The Fe0/H2O2 Process

Bogacki

Marcinowski

El-Khozondar

2019

Water

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One of the major environmental concerns associated with waste disposal is the large amount of generated landfill leachates (LL), which are considered a type of wastewater with a complex composition. There is an urgent need to find an effective LL treatment method. LL were subjected to pretreatment followed by the Fe0/H2O2 process. Pretreatment efficiency was coagulation at pH 6.0 >> coagulation at pH 9.0 > acidification at pH 3.0. Coagulation at pH 6.0 in an optimal Fe3+ dose of 1000 mg/L decreased total organic carbon (TOC) from the initial concentration of 1061 mg/L to 491 mg/L while acidification to pH 3.0 decreased TOC to 824 mg/L. After acidification, the Fe0/H2O2 process with 8000/9200 mg/L Fe0/H2O2 reagent doses decreased TOC to 499 mg/L after a processing time of 60 min. Performance of the Fe0/H2O2 process after coagulation at pH 6.0 for optimal Fe0/H2O2 8000/5540 mg/L reagent doses decreased TOC to 268 mg/L (75% TOC removal). Treatment of landfill leachates with combined process coagulation and Fe0/H2O2 also increased their susceptibility to biodegradation, expressed as the biochemical oxygen demand/chemical oxygen demand (BOD5/COD) ratio from 0.13 to 0.43, allowing LL to be considered as susceptible to biodegradation. Fe0/H2O2 process kinetics was described. A statistical analysis confirmed the obtained results. The proposed method can be successfully applied for LL treatment.

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Evolution of nitrogen species in landfill leachates under various stabilization states

Cited by 19 publications

References 35 publications

Effect of on-Site Sludge Reduction and Wastewater Treatment Based on Electrochemical-A/O Combined Process

Effect of on-Site Sludge Reduction and Wastewater Treatment Based on Electrochemical-A/O Combined Process

Characterization and treatment of landfill leachates by electro‐Fenton process: A case study in Algeria

Treatment of Landfill Leachates with Combined Acidification/Coagulation and The Fe0/H2O2 Process

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