Heat Activated Zeolite for the Reduction of Ammoniacal Nitrogen, Colour, and COD in Landfill Leachate

Aziz, Hamidi Abdul; Noor, Ahmad Fauzi Mohd; Keat, Yap Wei; Alazaiza, Motasem Y. D.; Hamid, Azhar

doi:10.1007/s41742-020-00270-5

Cited by 33 publications

(10 citation statements)

References 42 publications

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“…Aponte-Morales et al 15 showed that zeolite (chabazite) removed 88% of TAN from anaerobically digested swine waste centrate with an initial TAN concentration of 806 mg L −1 . Aziz et al 34 found that 100 g L −1 zeolite achieved TAN and sCOD removals of 53.1% and 22.5% from landfill leachate, respectively. As FA and NH 4 + rapidly equilibrate in aqueous solution, adsorption of NH 4 + by zeolite decreases FA concentrations and reduces its inhibition to nitrifiers.…”

Section: Resultsmentioning

confidence: 99%

Enhanced landfill leachate treatment in sequencing batch biofilm reactors (SBBRs) amended with zeolite and biochar

Gao

Yang

Dasi

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND: Biological treatment of landfill leachate is inhibited by high concentrations of ammonia and recalcitrant organic matter. This study investigated the addition of natural adsorbent materials, zeolite (clinoptilolite) and biochar, to enhance biological treatment of landfill leachate in sequencing batch biofilm reactors (SBBRs). Three bench-scale SBBRs were set up with varying types of biofilm support media: (i) lightweight expanded clay aggregate (LECA) as a control (C-SBBR); (ii) LECA + zeolite (CZ-SBBR); and (iii) LECA + zeolite + biochar (CZB-SBBR). SBBRs were operated with alternating anoxic and aerobic stages to promote total nitrogen (TN) removal via nitrification/denitrification. RESULTS: Excellent TAN removal (>99%) was achieved in all three SBBRs throughout the study, most likely as a result of the favorable environmental conditions and long hydraulic retention time (HRTs) applied (nine or more days). Biochar addition in CZB-SBBR resulted in significantly higher chemical oxygen demand (COD) (61-83%) and color (82-95% as UV456) removals compared with C-SBBR (42-44% for COD and 28-33% for color) and CZ-SBBR (34-45% for COD and 20-35% for color). High effluent nitrate (NO 3 − ) concentrations initially were observed in CZB-SBBR, most likely due to limited organic carbon availability for denitrification. However, after >1 year of operation, NO 3 − accumulation declined and TN removal of 81% was achieved, indicating that the main nitrogen removal pathway shifted from simultaneous nitrification/denitrification to partial nitritation/ anammox. CONCLUSIONS: Zeolite/biochar amended SBBRs are a promising approach for enhanced landfill leachate treatment.

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Section: Resultsmentioning

confidence: 99%

Enhanced landfill leachate treatment in sequencing batch biofilm reactors (SBBRs) amended with zeolite and biochar

Gao

Yang

Dasi

et al. 2021

J of Chemical Tech & Biotech

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“…Other natural materials such as zeolite and clays are effective adsorbents-comparable to AC-for landfill leachate treatment (Augusto et al 2019). The application of natural minerals such as zeolites as adsorbents has been proposed due to their high adsorption and ion exchange capacities and their low cost (Aziz et al 2020). Zeolites are composed of crystalline hydrated aluminosilicates; their structures include pores filled with water.…”

Section: Activated Carbonmentioning

confidence: 99%

Recent technologies for leachate treatment: a review

Cherni

Elleuch

Messaoud

et al. 2021

Euro-Mediterr J Environ Integr

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Municipal solid waste leachate, a kind of wastewater, can severely damage the environment and contaminate the groundwater because of its high organic matter and toxic heavy metal concentrations. Due to its complex composition, this wastewater must be properly treated prior to being discharged into the environment. In recent decades, several biological approaches (e.g., bioremediation, phytoremediation, and bioreactors) and physicochemical processes (e.g., coagulation/flocculation, air stripping, and advanced oxidation processes) have proven effective at removing the organic load and the toxicity of this effluent. Physicochemical treatments have been applied as pretreatment or post-treatment steps for biological processes, but these methods do not always provide satisfactory results and can cause secondary pollution in some cases. In addition, owing to the high concentrations of organic matter, ammonia, and trace metals in landfill leachate, combined approaches to leachate treatment have been reported to be efficient. This article highlights the advantages and drawbacks of these approaches to the treatment of leachate by providing an updated overview of the various methods that have been successfully applied in this field. Further studies should focus on improving landfill leachate treatment to maximize removal performance.

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“…Heat-activated zeolite (HAZ): Zeolite was activated at 150 for 3 h. Batch study experiments were performed to identify the optimum zeolite dosage and the optimum pH of leachate (Aziz et al 2020). The granular zeolite was filtered to a final working size between 2 and 4 mm.…”

Section: Modified Zeolitesmentioning

confidence: 99%

“…The ability of activated carbon-zeolite mixtures as an adsorbent was investigated and 21.01 mg/g of ammoniacal nitrogen was removed by a mixture of activated carbon and zeolite (Aziz et al 2010). Besides, the potential use of raw zeolite and heated activated zeolite in the abatement of COD, NH 3 -N and colour from leachate was examined (Aziz et al 2020). Zeolite was activated using different temperatures, namely at 150 °C, 200 °C and 250 °C for 3 h. The optimum pH for NH 3 -N was 7 with a percentage removal of 55.8% while better abatement of COD and colour was obtained at pH 4 with a percentage removal of 24.3% and 73.8%, respectively.…”

Section: Application Of Batch Adsorption Systems On Landfill Leachatementioning

confidence: 99%

A review on the application of nanoporous zeolite for sanitary landfill leachate treatment

Turan

2021

Water Science and Technology

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This review deals with low-cost nanoporous zeolites for the treatment of sanitary landfill leachate. Organic contaminants and ammoniacal nitrogen are significant parameters in landfill leachate treatment. Adsorption processes are regarded as promising alternative treatment options in this respect. Zeolites are aluminosilicate materials that are widely used in separation, ﬁltration, adsorption and catalysis. Natural zeolite is a low-cost and readily available form of zeolite and is a promising candidate to be used as an ion exchange material for ammonia and other inorganic pollutant removal from landfill leachate. In this review, adsorption isotherms and kinetic models in batch system are evaluated and adsorption design parameters of the fixed-bed system are presented. Studies on ammonia removal from landfill leachate via zeolites have been thoroughly investigated. Leachate treatment systems combined with zeolites are presented. Cost of zeolites are also reported in comparison with other adsorbents. The investigated studies demonstrate that activated zeolite can improve the removal of COD, NH3-N and color significantly compared to the case where raw zeolite is used. Moreover, the composite of activated carbon and zeolite is also favorable for ammonia removal according to reported findings, where best adsorptive removal is attained on the composite media (24.39 mg/g).

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Heat Activated Zeolite for the Reduction of Ammoniacal Nitrogen, Colour, and COD in Landfill Leachate

Cited by 33 publications

References 42 publications

Enhanced landfill leachate treatment in sequencing batch biofilm reactors (SBBRs) amended with zeolite and biochar

Enhanced landfill leachate treatment in sequencing batch biofilm reactors (SBBRs) amended with zeolite and biochar

Recent technologies for leachate treatment: a review

A review on the application of nanoporous zeolite for sanitary landfill leachate treatment

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