Combined processes of ozonation and supercritical water oxidation for landfill leachate degradation

Scandelai, Ana Paula Jambers; Filho, Lúcio Cardozo; Martins, Danielly Cruz Campos; Freitas, Thábata Karoliny Formicoli de Souza; Garcia, Jocilaine; Tavares, Célia Regina Granhen

doi:10.1016/j.wasman.2018.04.031

Cited by 51 publications

(15 citation statements)

References 55 publications

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“…The lower values of COD and BOD5 in the surface water relative to its values in the leachates indicates higher values of dissolved oxygen in the river relative to the leachates samples from the dumpsites. Present findings revealed that the leachates may be potential source of adjacent water sources contamination, also previous findings documented that the leachates are one of the main sources of river water contamination (Ayandiran et al, 2018;Camaño Silvestrini et al, 2019;Deng et al, 2019;Hobson et al, 2018;Kang et al, 2019;Kayembe et al, 2018;Mor et al, 2018;Qu et al, 2019;Rai et al, 2019;Rezapour et al, 2018;Scandelai et al, 2018;Tanikawa et al, 2018;Wu et al, 2018;Xiong et al, 2018;Xu et al, 2018;Yuan et al, 2019;Zhao et al, 2018).…”

Section: Resultssupporting

confidence: 74%

Leachates and physicochemical characteristics of Rumuodumaya dumpsites, Niger-Delta, Nigeria

Int¹

2019

Preprint

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The physicochemical characteristics and heavy metal levels of leachates at the Rumuodumaya dumpsites and the surface water of its adjacent river was investigated by appropriate field instrument for in situ measurement, standard procedures and AGILENT 55B spectra for the heavy metals. The results from the dumpsites and surface water of the river generally indicate that as of the time of analysis, there is no serious threat to its immediate environment except the nickel concentrations in the dumpsites and surface water of the river, respectively and whose values were beyond the recommended limit of WHO/USEPA (0.05 mg/L) for safe drinking water. The trend of the results also indicates that the dumpsites are sources of numerous soil and water pollutants capable of depleting oxygen levels in the river and this could pose several and serious health risk to humans and aquatic life. Adequate solid waste disposal technique should be adopted by the appropriate agency to forestall this threat to the Rumuodumaya environment.

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Section: Resultssupporting

confidence: 74%

Leachates and physicochemical characteristics of Rumuodumaya dumpsites, Niger-Delta, Nigeria

Int¹

2019

Preprint

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“…The SS value of Run 1 was 0.1 g/L, and it decreased to 0.03 g/L, recording a 70.0% removal efficiency. Previous studies have shown that the AOP process was effective in chl-a removal when the initial concentration was~160 mg/m 3 [29,30], and was also shown to be effective in SS removal [25,[31][32][33] and turbidity removal [14,[34][35][36].…”

Section: Degradation Of Major Microalgal Indicators By Cold Plasma Apmentioning

confidence: 97%

“…Therefore, newly suggested methods have been tested, such as modified local soil technology [3], advanced oxidation processes (AOPs) [13], and so on. In most cases, the amount of biomass has been quantified by either suspended solids (SS) [14], turbidity, or chlorophyll-a (chl-a) [15], and thus the control over the major indicator pollutants is crucial for water resources protection and security.…”

Section: Introductionmentioning

confidence: 99%

Cold Plasma Treatment for Efficient Control over Algal Bloom Products in Surface Water

Kim

Nam

Jang

et al. 2019

Water

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Algal bloom significantly alters the physicochemical properties of water due to drastic pH change, dissolved oxygen depletion/super-saturation, and toxicity, which lead to ecosystem destruction. To prevent this, this study evaluated the reduction performance of algal biomass by applying a non-thermal or cold plasma process. We used chlorophyll-a (chl-a), suspended solids (SS), and turbidity as indicators of the biomass. Results demonstrated that their removal efficiencies were in the ranges 88–98%, 70%–90%, and 53%–91%, respectively. Field emission scanning electron microscopy indicated how the cell wall of microalgae was destroyed by cold plasma. Also, the removal kinetics of cold plasma confirmed the enhanced removal rate constants. The estimated required times for 99% removal were 0.4–1.2 d (chl-a), 1.3–3.4 d (SS), and 1.6–6.2 d (turbidity), respectively. Overall, cold plasma could be a useful option to effectively treat pollution associated with algal bloom in surface water.

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“…The worldwide wastewater discharge regulations and standards have become stricter; hence, there is an urgent need to find an effective LL treatment method. Many researchers are investigating new and effective methods for LL treatment, such as sorption on magnetic particles [2] and other sorbents [8], reactive granular filters [9], the use of metallic iron [4,10,11] and other heterogeneous catalysts [12,13], Fenton (classical and solar) [14][15][16][17], electro-Fenton [18,19], and other electrochemical processes [11,[20][21][22][23][24], usage of different oxidants and their combination [25,26], microwaves [10], ultrasounds [27], membrane processes [28], hydrodynamic cavitation [29], microalgae [30], biofiltration [21,31], supercritical water oxidation [32], oscillating biological membrane photoreactors [33], anaerobic digestion [27,34], dynamic membrane bioreactors [35], bio-electro-Fenton [36], upflow sludge bed reactors [37], moving bed biofilm reactors [38], and the sequencing batch reactor [39]. Moreover, a few review articles have summarized the LL treatment methods [40][41][42]…”

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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Combined processes of ozonation and supercritical water oxidation for landfill leachate degradation

Cited by 51 publications

References 55 publications

Leachates and physicochemical characteristics of Rumuodumaya dumpsites, Niger-Delta, Nigeria

Leachates and physicochemical characteristics of Rumuodumaya dumpsites, Niger-Delta, Nigeria

Cold Plasma Treatment for Efficient Control over Algal Bloom Products in Surface Water

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

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