Effective photochemical treatment of a municipal solid waste landfill leachate

Makhatova, Ardak; Mazhit, Birzhan; Sarbassov, Yerbol; Meiramkulova, Kulyash; Inglezakis, Vassilis J.; Poulopoulos, Stavros G.

doi:10.1371/journal.pone.0239433

Cited by 17 publications

(7 citation statements)

References 67 publications

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“…If we compare the TOC and COD abatement for different Fenton processes, Cu/ZrO 2 catalyst proves to be a promising material, as shown in Table 2, with a TOC abatement of 65% and a COD removal of 70%, when the reaction is carried out at pH 5. Heterogeneous [79][80][81], homogeneous [76][77][78] electro [71] or photo-Fenton [72][73][74] processes can be achieved, at pH 3, a TOC abatement in the range 56-75% and a COD removal of 61-98%. pH is a critical parameter, and it is important to assess Fenton's suitability for recalcitrant contaminants at circumneutral pH.…”

Section: Effect Of Reaction Variablesmentioning

confidence: 99%

Removal of Organics from Landfill Leachate by Heterogeneous Fenton-like Oxidation over Copper-Based Catalyst

et al. 2022

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Landfill leachates are a mixture of high concentration organic and inorganic contaminants and need to be appropriately treated due to their toxicity and severe adverse effects on the environment. Here, we studied the treatment of landfill leachate through a heterogeneous Fenton-like oxidation process using a zirconia supported copper catalyst (Cu/ZrO2). Reaction conditions such as pH, amount of catalyst, oxidant dose, temperature, and reaction time were investigated and their effects on pollutant abatement discussed. AOS (average oxidation state) and COS (carbon oxidation state) parameters were used for the evaluation of the degree of oxidation of the process, obtaining some insight into the formation of oxidized intermediates (partial oxidation) and the total oxidation (mineralization) of the leachate during the reaction. A two-step oxidation process enhanced the overall performance of the reaction with an abatement of organic compounds of 92% confirming the promising activity of a copper-based catalyst for the treatment of liquid waste. Higher catalytic activity was achieved when the following reaction conditions were applied: 70 °C, pH 5, 200 mg/L of catalyst, 30 mL/L of H2O2 dose, and 150 min. In addition, durability of the catalyst under optimized reaction conditions was verified by repeated reaction cycles.

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Section: Effect Of Reaction Variablesmentioning

confidence: 99%

Removal of Organics from Landfill Leachate by Heterogeneous Fenton-like Oxidation over Copper-Based Catalyst

et al. 2022

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“…Maslahati Roudi et al ( 2018) proved that the maximum COD removal rate (100%) was achieved using the optimum operational conditions of 781.25 mg L −1 Fe 2+ , pH 3, and a reaction time of 28.03 min. Recently, Makhatova et al (2020) tested the applicability of the Fenton process for the removal of toxic compounds from LFL. They proved that the most favorable concentrations of H 2 O 2 and ferric ion for carbon removal were 6660 mg L −1 and 400 ppm, respectively.…”

Section: Fenton's Reactionmentioning

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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“…The rate of leachate formation is determined by climatic variables (e.g., precipitation, evaporation) as well as landfill characteristics (e.g., infiltration, storage) (Ehrig and Stegmann 2018). It has a high percentage of organic materials (both biodegradable and nonbiodegradable carbon), ammonia-nitrogen, heavy metals, and chlorinated organic and inorganic salts, which can cause significant environmental degradation if it gets into groundwater and surface water (Makhatova et al 2020). Some of these contaminants, however, can be dissolved by microorganisms (Veiga et al 2014;Taş et al 2018), while others may not decompose and remain in the landfill for an extended amount of time (Wojciechowska 2013).…”

Section: Introductionmentioning

confidence: 99%

Modelling Assisted Phytoremediation of Landfill Leachate using Surface Flow Constructed Wetland Enhanced by <i>Pistia stratiote</i> and <i>Salvinia molesta</i>

Ugya¹,

Meguellati²

2022

J. Ecol. Eng.

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The current study is aiming to expose the efficiency of surface flow constructed wetland (CW) assisted by Pistia stratiote and Salvinia molesta in the remediation of landfill leachates. A laboratory-scale surface flow constructed wetland was constructed to imitate the characteristic of a natural pond. Composite sample of leachates was collected and transported to the laboratory for further analysis and studies. The removal efficiency of phenol, pesticides, sulphate, chloride, colour, turbidity, total suspend solid (TSS), total dissolved solid (TDS), biological oxygen demand (BOD), chemical oxygen demand (COD), ammonia nitrate and heavy metals (Pb, Cr, Cu, Cd, Ni, Hg)). The removal of heavy metal ions in the CW was determined by using a phyto-system dynamic (phyto-SDA) model while the composite design (CCD) type of response surface methodology (RSM) was employed in this study for the optimization of pesticides and phenol removal from the landfill leachates by the constructed wetland (CW). The study also predicts that the deviation from the linearity between the heavy metals in the leachates and heavy metals in the sediment and in the plant tissues is influenced by the physicochemical status of the leachate and the mixed cultivation of Pistia stratiote and Salvinia molesta. The study reaffirms the role of sediments in the determination of the fate of heavy metals due to its crucial role in the bioavailability of heavy metals for uptake by P. stratiotes and S. molesta in a CW. The study also shows a positive effect of concentration and exposure time on the reduction efficiency of both pesticides and phenol. The result shows that exposure time and concentration of phenol and pesticides are useful in the optimization of the removal efficiency of pesticides and phenol.

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Effective photochemical treatment of a municipal solid waste landfill leachate

Cited by 17 publications

References 67 publications

Removal of Organics from Landfill Leachate by Heterogeneous Fenton-like Oxidation over Copper-Based Catalyst

Removal of Organics from Landfill Leachate by Heterogeneous Fenton-like Oxidation over Copper-Based Catalyst

Recent technologies for leachate treatment: a review

Modelling Assisted Phytoremediation of Landfill Leachate using Surface Flow Constructed Wetland Enhanced by <i>Pistia stratiote</i> and <i>Salvinia molesta</i>

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