Retrofitting a full-scale multistage landfill leachate treatment plant by introducing coagulation/flocculation/sedimentation and ultrafiltration process steps

Glarakis, John; Remmas, Nikolaos; Azis, Konstantinos; Melidis, Paraschos

doi:10.1007/s10661-023-10939-x

Cited by 5 publications

(4 citation statements)

References 47 publications

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“…Leachate from waste transfer stations contains high levels of suspended solids and grease, posing a significant challenge for subsequent treatment. Pretreatment primarily involves the use of physical and chemical treatment technologies, such as coagulation, sedimentation, and air flotation [30][31][32]. Hence, the primary focus of future research will be on the elimination of pollutants like suspended solids, oil, and grease through pretreatment.…”

Section: Discussionmentioning

confidence: 99%

“…Additionally, the B/C ratio nearly doubled. Glarakis et al [32] enhanced the treatment system by incorporating a coagulation/flocculation/settlement unit and ultrafiltration membranes to improve the treatment of waste leachate. The concentrations of COD and NH 4 + -N in the leachate were 3095±706 mg/L and 1054±141mg/L, respectively, and the B/C ratio was 0.22, with high concentrations of certain heavy metals.…”

Section: Other Technologiesmentioning

confidence: 99%

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Research progress of leachate treatment in waste transfer station

Fu,

Su,

et al. 2024

E3S Web Conf.

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The garbage leachate generated by the waste transfer station has the characteristics of scattered water sources, relatively small water quantity, large fluctuations in water quality and quantity, and high concentrations of organic matter, ammonia nitrogen, suspended solids, and other pollutants. These characteristics make it prone to environmental hazards. This paper analyzes the characteristics and hazards of leachate from waste transfer stations and introduces the current research status of physico-chemical, biological, and combined treatment of leachate from waste transfer stations. Meanwhile, this paper introduces engineering practices for leachate treatment in waste transfer stations, offering a valuable reference for research and engineering practices in this field. Finally, this review discusses pretreatment, economic, low-carbon, and high-efficiency treatment methods and facilities, the recovery of valuable elements, energy recycling technologies, and the demand outlook for high-standard deep treatment processes.

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Section: Discussionmentioning

confidence: 99%

Section: Other Technologiesmentioning

confidence: 99%

Research progress of leachate treatment in waste transfer station

Fu,

Su,

et al. 2024

E3S Web Conf.

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“…Conventional leachate treatment often includes recirculation of the produced leachate into the landfill body [7,8], co-treatment of leachates with municipal sewage in centralized Wastewater Treatment Plants [9] and on-site aerobic or anaerobic biological treatment [10,11]. In the case of on-site treatment, chemical or/and physical treatment processes such as coagulation-flocculation, chemical oxidation, hydrodynamic cavitation, carbon adsorption and use of membranes are sometimes combined with biological processes to achieve a high-quality effluent [12][13][14][15][16][17][18]. The treatment systems that are commonly used in the larger Greek landfills combine primary treatment, aerobic biological treatment in activated sludge bioreactors and reverse osmosis (RO) in series.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Operation of a Full-Scale Sequencing Batch Reactor–Reverse Osmosis–Evaporation System Used to Treat Landfill Leachates: Removal of Pollutants, Energy Consumption and Greenhouse Gas Emissions

Tsompanoglou,

Koutsou,

Stasinakis

2023

Energies

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Limited information is available in the literature regarding the energy consumption and the greenhouse gases emitted during landfill leachates treatment. A full-scale landfill leachates treatment system that included primary sedimentation, biological treatment in sequencing batch reactors, reverse osmosis and mechanical vapor recompression evaporation was monitored and evaluated for the removal of major pollutants, energy consumption and greenhouse gas emissions. Samples were taken during a period of two years from different points of the system, while the actual power consumption was calculated considering the available mechanical equipment and the hours of operation. The quantities of greenhouse gases emitted were estimated using appropriate equations and based on the operational characteristics of the system. According to chemical analyses, biological treatment resulted in partial removal of COD and total nitrogen, while the removal of BOD5 and NH4-N was significant, reaching 90 and 98%, respectively. Use of reverse osmosis increased the removal of all pollutants, satisfying the requirements of the legislation on wastewater discharge into the environment. Power consumption was calculated to be 35.3 KWhr per m3 of treated leachate, while mechanical vapor recompression evaporation was responsible for 60.5% of the total energy required. The contribution of other processes to energy consumption was as follows, in decreasing order: sequencing batch reactors > reverse osmosis > primary treatment. The roots blower vacuum pump used for mechanical vapor recompression evaporation, and the blowers providing air to the sequencing batch reactors, were the most energy-intensive pieces of apparatus, contributing 44.2% and 11.3% of the required energy, respectively. The quantity of greenhouse gases emitted was estimated to be 27.7 Kg CO2eq per m3 of treated leachates. Among the different processes used, biological treatment and mechanical vapor recompression evaporation contributed to 45.7% and 44.1% of the total emissions, respectively. The findings of this study reveal that an integrated landfill leachate treatment system that combines biological treatment and reverse osmosis can assure the protection of the aquatic environment by producing high-quality effluent; however, further research should be conducted regarding the sustainable management of reverse osmosis concentrate. Mechanical vapor recompression evaporation contributes significantly to the environmental footprint of the landfill leachates treatment system due to both high energy consumption and elevated emissions of greenhouse gases.

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“…and landfill gas (methane, carbon dioxide, nitrogen, hydrogen, carbon monoxide, ethane, ethene, acetaldehyde, propane, butane, helium, halogenated compounds, hydrogen sulfide, organosulfur compounds, etc. ), the treatment of which presents new environmental challenges [4][5][6][7][8][9]. Leachate characteristics depend on the type and composition of the waste, surface runoff and snowmelt, evaporation, infiltration, age of the landfill, etc.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Denitrification and Nitrification Processes during Landfill Leachate Treatment

Schneider,

Yotinov,

Dinova

et al. 2023

Processes

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Landfill leachate is generated from waste degradation in landfill sites, and its treatment includes biological or combined treatment with physico-chemical methods. A frequently applied technology in the biological stage of landfill leachate treatment plants is based on denitrification and nitrification. Nevertheless, with the availability of a huge number of scientific reports, the management of denitrification and nitrification (D/N) processes in the frame of real wastewater treatment plants (WWTPs) is rather difficult and always remains a critical technological problem. This study aims to perform a comparative assessment between denitrification and nitrification processes during landfill leachate treatment in three different situations in the WWTP of the Municipal Enterprise for Waste Treatment in Sofia City, Bulgaria. The comparative assessment is based on the biotransformation effectiveness of ammonium ions in the course of nitrification and of nitrates in the course of denitrification. Mixed samples (wastewater and activated sludge) were taken from the sequencing batch reactors operating in the mode of denitrification and nitrification. All physico-chemical (pH, dissolved oxygen, organics concentration, BOD5:COD, nitrogen and phosphorous) and biological (sludge volume index, sludge biotic index, quantity of aerobic heterotrophs, denitrifiers and nitrifiers, total dehydrogenase activity) indicators were investigated in the samples from the biobasins in the mode of denitrification and nitrification. The conditions for the implementation of the two processes were compared, along with the state of the activated sludge in the different reactors. The obtained results showed that denitrification was the critical process in the technology on the base of D/N. A major factor that managed the denitrification was the lower concentration of biodegradable organic matter which led to a deformation of the activated sludge structure, a decrease in the count of heterotrophic microorganisms, a decrease in the total activity of the activated sludge and an inhibition of the nitrate reductase activity. The nitrification processes were accomplished with high intensity. The results confirmed that D/N could be optimized and controlled using specific wastewater treatment technology parameters and purposely applied indicators.

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Retrofitting a full-scale multistage landfill leachate treatment plant by introducing coagulation/flocculation/sedimentation and ultrafiltration process steps

Cited by 5 publications

References 47 publications

Research progress of leachate treatment in waste transfer station

Research progress of leachate treatment in waste transfer station

Evaluating the Operation of a Full-Scale Sequencing Batch Reactor–Reverse Osmosis–Evaporation System Used to Treat Landfill Leachates: Removal of Pollutants, Energy Consumption and Greenhouse Gas Emissions

Assessment of Denitrification and Nitrification Processes during Landfill Leachate Treatment

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