Improved landfill leachate quality using ozone, UV solar radiation, hydrogen peroxide, persulfate and adsorption processes

Poblete, Rodrigo; Oller, Isabel; Maldonado, Manuel I.; Cortés, Ernesto

doi:10.1016/j.jenvman.2018.11.030

Cited by 58 publications

(19 citation statements)

References 42 publications

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“…62,63 In this context, the adsorption process makes it possible to remove these substances from the LL, enhancing its quality 16 and reducing its toxicity (Poblete et al 2019; Klauck et al 2017). 64,65 Although the reduction in toxicity is substantial, it is insufficient because the inhibition on the respiration of the sludge biomass (in terms of OUR) still remains. It is therefore unable to mix adequately with microorganisms, making it necessary to further decrease the toxicity present in LL in order to prevent sludge intoxication.…”

Section: Toxicity Analysismentioning

confidence: 99%

Use of fish scales as an adsorbent of organic matter present in the treatment of landfill leachate

Poblete

Cortés

Bakit

et al. 2020

J of Chemical Tech & Biotech

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This study focuses on the removal of organic pollutants present in landfill leachate (LL) using an adsorption process with activated carbon (AC) obtained from fish scales, and subsequently evaluates the reduction of toxicity in the wastewater obtained from the process. The AC obtained is a mesoporous material, with a cumulative pore area of 1.57 m2 g−1, Brunauer–Emmett–Teller (BET) of 1.8329 m2 g−1 and adsorption average pore width of 12.79833 nm. The maximum removal of pollutants was achieved at natural pH (6.71) of the LL, with a load of 3 g L−1, resulting in 60.1% colour and 37.3% chemical oxygen demand (COD). The rate of COD removal per g of AC increase had a maximum value of 5.6 at pH 10 when passing from 0.5 to 1 g AC. The lowest rate of 0.6 occurred for the same pH when it passed from 1 to 2 g AC. At pH 3 the second lowest rate of 3.3 was observed when passing from 2 to 3 g AC. At pH 3 there was always an increase in the rate as more AC was added. Conversely, at natural pH 6.71 the rate tended to decrease. At pH 10 the rate first decreased and then increased. At acidic pH, because it is the one with the lowest COD removal, it would be expected that by adding more AC the rate would continue to increase as there are easily accessible sites still available. Langmuir isotherms fitted adequately with the experimental data, providing an R2 of 0.9657, which is consistent with a monolayer adsorption pattern. The LL before the adsorption process had an inhibition ratio of 20.4%, due to the fact that leachate can be toxic because of the presence of hazardous organic compounds. After adsorption processes at pH 6.71, the inhibition ratios were 16.9%, 13.8%, 12.2% and 10.9% at AC loads of 0.5, 1, 2 and 3 g L−1, respectively, due to decreasing COD and colour of the LL over the course of the treatment. It was observed that the reduction of the inhibition ratio was greater at higher loads of adsorbent. © 2020 Society of Chemical Industry

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Section: Toxicity Analysismentioning

confidence: 99%

Use of fish scales as an adsorbent of organic matter present in the treatment of landfill leachate

Poblete

Cortés

Bakit

et al. 2020

J of Chemical Tech & Biotech

Self Cite

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“…Also, other studies suggest that advanced oxidation usage increases biodegradability [14,17]. Coagulation with FeCl 3 at pH 6.0, coupled with the Fe 0 /H 2 O 2 process, proved to have similar efficiency to other processes tested in the available literature, including electrochemical [11,20,36] and advanced oxidation [15][16][17]19,21,25] treatments.…”

Section: Fe 0 /H 2 O 2 Processmentioning

confidence: 64%

“…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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“…Figure 2f shows the leachates' TDS levels in the two sites compared to the regulatory body maximum limit. Results revealed that the leachates in Elelenwo dumpsites, Rivers State, Nigeria are polluted, and under the current scenario of increasing water sheds pollution (Abbas et al, 2018;Ali et al, 2019;Barbosa Segundo et al, 2019;Camaño Silvestrini et al, 2019;Čelić et al, 2019;Chu et al, 2019;Costa et al, 2019;Fiorentino et al, 2019;Iqbal, 2016;Iqbal et al, 2019;Joshi and Gogate, 2019;Li et al, 2019;Ma et al, 2019;Majdinasab and Yuan, 2019;Nzediegwu et al, 2019;Poblete et al, 2019;Qi et al, 2019;Wang et al, 2019a;Wang et al, 2019b;Yang et al, 2019;Zhang et al, 2019), there is need to monitor water bodies' quality regularly and adopt the efficient methods to treat the wastewater www.bosaljournals/chemint/ editorci@bosaljournals.com (Caicedo et al, 2019;Hernández-Chover et al, 2018;Mohammadzadeh Pakdel and Peighambardoust, 2018;Salgot and Folch, 2018;Yu et al, 2019).…”

Section: Resultsmentioning

confidence: 99%

Toxicological symptoms and leachates quality in Elelenwo Rivers State, Nigeria

Int¹

2019

Preprint

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The toxicological symptoms prevalent and reported in Elelenwo area were taken into consideration and the leachates quality of its notable dumpsites was investigated for possible links. In situ measurements were made and standard procedures followed for analyses of lead, cadmium and nickel as well as other physicochemical load of the leachates. The results obtained were compared with various guidelines set by some notable regulatory bodies. The outcome showed more than 100 folds toxicity levels above the various benchmarks especially for lead, cadmium and nickel. These dumpsites as a result are environmental hotspots for pollution distribution to nearby surface waters, air and wastewaters bodies as well as the ground water. There is a strong link between reported toxicological symptoms among inhabitants of Elelenwo and Leachates toxicity from these dumpsites and there is emergency need for clean-up action by appropriate authorities.

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Improved landfill leachate quality using ozone, UV solar radiation, hydrogen peroxide, persulfate and adsorption processes

Cited by 58 publications

References 42 publications

Use of fish scales as an adsorbent of organic matter present in the treatment of landfill leachate

Use of fish scales as an adsorbent of organic matter present in the treatment of landfill leachate

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

Toxicological symptoms and leachates quality in Elelenwo Rivers State, Nigeria

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