Denitrification of a landfill leachate with high nitrate concentration in an anoxic rotating biological contactor

Cortez, Susana; Teixeira, P.; Oliveira, Rosário; Мота, М.

doi:10.1007/s10532-010-9439-8

Cited by 26 publications

(5 citation statements)

References 30 publications

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“…Based on the results of research conducted at various discharge ozone and the contact time corresponding factorial design, the percentage of COD removal from leachate at pH 11 was higher than the percentage removed at the original pH (pH 8.3). This was similar to the findings by Cortez et al (2010a) at alkaline pH. They found that more molecules of ozone decomposed to form hydroxyl ions (OH -) and hydroxyl radicals (OH•).…”

Section: Ph Influence In Cod Removalsupporting

confidence: 89%

Application of Cavitation Ozonation Process on Recalcitrant Organic Matter Degradation from Stabilized Landfill Leachate

Moersidik¹,

Annasari²,

Nugroho³

2021

IJTech

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Treatment of stabilized leachate as a by-product of municipal landfills has been a significant challenge as the leachate contains recalcitrant organic matter which has low biodegradability. In this study, the efficacy of the advanced oxidation process using cavitationozonation to remove recalcitrant organic matter in leachate samples from TPST Bantar Gebang was evaluated. Several operational and process parameters including pH, ozone flowrate, and contact time were varied to determine the best conditions for removing recalcitrant organic matter represented by Chemical Oxygen Demand (COD). This study determined the optimum operating conditions for the cavitation-ozonation process: pH 11, ozone discharge of 3 L/min, and contact time of 30 minutes. The result was a COD removal efficiency of 20.37%, an increase of 52.06% in the concentration of BOD5, and a 90% increase in the ratio of BOD5 to COD. This study has shown that cavitation-ozonation is an effective pre-treatment, as it increases the biodegradability of stabilized leachate and reduces the load on subsequent treatment processes.

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Section: Ph Influence In Cod Removalsupporting

confidence: 89%

Application of Cavitation Ozonation Process on Recalcitrant Organic Matter Degradation from Stabilized Landfill Leachate

Moersidik¹,

Annasari²,

Nugroho³

2021

IJTech

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“…This behavior corroborates the work by Cortez et al (2010), who treating leachate from landfill in contact reactor found the values between 6.4 and 7.3 for the CL and from 7.8 -9.4 for the TL. This behavior, according to Cortez et al (2011), is due to the consumption of hydrogen ions resulting from the conversion of N-NO 3 to nitrous oxides in the reactor due to denitrification process. However, since no analysis of nitrogen was carried out, it is not possible to allege that this behavior is due to the denitrification process.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of the phytotoxicity of landfill leachate treated with a Rotating Biological Reactor

Hoss

Zanatta

Quadro

et al. 2022

Eng. Sanit. Ambient.

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One of the major drawbacks of this final disposal technique is leachate production, which occurs due to the degradation of organic matter and rainwater percolation. The leachate composition is quite varied, with high organic load and various compounds that may be toxic to the environment. To reduce the polluting potential of the leachate, it must be subjected to an appropriate treatment. Biological treatments are widely used in the treatment of leachate, although these technologies have some drawbacks. As an alternative to conventional biological treatments, rotating biological reactors are used. The objective of this study was to determine the efficiency of a pilot scale rotating biological reactors in the removal of biochemical oxygen demand, chemical oxygen demand, and phosphorus from the landfill leachate. Effluent toxicity and rotating biological reactors's ability to remove this toxicity were also verified by calculating the germination index of lettuce (Lactuca sativa) and cucumber (Cucumis sativus) seeds. The reactor showed an average efficiency of 75.99% of biochemical oxygen demand removal, 33.53% of chemical oxygen demand removal, and 16.04% of phosphorus removal. In fact, the cucumber and lettuce seeds proved sensitive to the toxicity of the effluent. For crude leachate, the germination index values of lettuce and cucumber were 13.28 and 49.61%, respectively. In this study, rotating biological reactors obtained a good efficiency in the removal of toxicity from leachate. The germination index of the seeds for the treated effluent was 60.9% for lettuce and 82.49% for cucumber.

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“…Overall removal of dissolved metals ranged from 19% for nickel to 59% for manganese (Henderson and Atwater 1995). The denitrification performance of a laboratory-scale rotating biological contactor using landfill leachate-from a municipal landfill in the North of Portugal-with high nitrate concentration was evaluated by Cortez et al (2011). Under a carbon-to-nitrogen ratio (C/N) of 2, the reactor achieved N-NO 3 -removal efficiencies above 95% for concentrations up to 100 mg N-NO 3 -per 1 L. The effectiveness of COD removal was about 90%.…”

Section: Rotating Biological Contactors and Reverse Osmosismentioning

confidence: 99%

Treatment of landfill leachates with biological pretreatments and reverse osmosis

2019

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Landfill leachates from municipal landfills are usually heavily contaminated and thus require treatments before direct discharge into natural waters. Selecting the appropriate technology for leachate treatment is still a major challenge for operations in municipal landfills. Biodegradation is effective for treating young leachates, whereas old leachates require processes such as chemical oxidation, coagulation-flocculation, chemical precipitation, ozonation, activated carbon adsorption, and reverse osmosis. Recently, the combination of biological pretreatments followed by physico-chemical processes has been shown to be very efficient. Here we review the efficiency of biological treatment in combination with reverse osmosis to clean landfill leachates. We studied in particular processes including a membrane bioreactor, activated sludge, a rotating biological contactor, and up-flow anaerobic sludge blanket treatments, followed by reverse osmosis. We found a 99-99.5% removal of the chemical oxygen demand (COD), and a 99-99.8% removal of N-NH 4 + using reverse osmosis and activated sludge. Using reverse osmosis with a rotating biological contactor, we observed 99% removal of COD, biochemical oxygen demand and N-NH 4 + . The combination of reverse osmosis, activated sludge and rotating biological contactor removed 98-99.2% of Cl − and 99-99.7% of Pb. Total suspended solids are best removed, up to 99%, by either a combination of reverse osmosis with membrane bioreactor, or reverse osmosis with activated sludge.

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Denitrification of a landfill leachate with high nitrate concentration in an anoxic rotating biological contactor

Cited by 26 publications

References 30 publications

Application of Cavitation Ozonation Process on Recalcitrant Organic Matter Degradation from Stabilized Landfill Leachate

Application of Cavitation Ozonation Process on Recalcitrant Organic Matter Degradation from Stabilized Landfill Leachate

Evaluation of the phytotoxicity of landfill leachate treated with a Rotating Biological Reactor

Treatment of landfill leachates with biological pretreatments and reverse osmosis

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