Landfill leachate wastewater treatment to facilitate resource recovery by a coagulation-flocculation process via hydrogen bond

Cheng, Sze Yin; Show, Pau Loke; Juan, Joon Ching; Chang, Jo Shu; Lau, Beng Fye; Lai, Sai Hin; Ng, Eng-Poh; Yian, Haw Choon; Ling, Tau Chuan

doi:10.1016/j.chemosphere.2020.127829

Cited by 66 publications

(15 citation statements)

References 44 publications

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“…9(e), (f), (g), it can be observed that the ocs presented complex and diverse morphologies, including spherical, granular and massive. Also, the SEM images shows that the ocs were well and compact in nature (Cheng et al 2021). The compact ocs structure was helpful to accelerate the settlement speed, which should be consistent with the sedimentation results.…”

Section: Sem and Edsmentioning

confidence: 98%

“…Nowadays, the conventional methods for the treatment of land ll leachate at home and abroad include biological method (Lin et al 2020), electrochemistry oxidation (Li et al 2011), membrane ltration (Keyikoglu et al 2021) and occulation method (Cheng et al 2021). Among them, occulation method is most commonly employed to purify wastewater due to its obvious advantages of simple operation, good treatment effect, energy saving, environmental friendliness and low cost (Cheng et al 2021). Typically, inorganic polyaluminum iron chloride (PAFC) occulant was generally used in industry.…”

Section: Introductionmentioning

confidence: 99%

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Red Mud-Based Polyaluminum Ferric Chloride Flocculant: Preparation, Characterization and Flocculation Performance

Cheng

Liu

et al. 2021

Preprint

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In this work, red mud was used as raw material to extract Al and Fe with hydrochloric acid. The high-efficiency polyaluminum iron chloride (PAFC) flocculant was prepared via adjusting the pH of the leaching solution, the molar ratio of aluminum and iron, and the polymerization temperature. The effect of synthesis and flocculation conditions on the flocculation performance of aged landfill leachate was investigated. The results confirmed that the PAFC prepared at the polymerization pH of 2.5, the Al/Fe molar ratio of 8, and the polymerization temperature of 70 °C had the optimum flocculation effect. The flocculation consequences of PAFC and commercial polyaluminum iron chloride flocculant (CPAFC) under different flocculation conditions were compared. The chemical oxygen demand (COD), UV254, chroma and settlement height of PAFC at flocculant concentration of 60 g/L and solution pH of 6 were 72.2%, 79.2%, 82.9% and 9.5 cm (within 90 min), respectively. PAFC has excellent flocculation performance and can be used as a simple, potentially low-cost wastewater treatment agent in industrial applications.

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Section: Sem and Edsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Red Mud-Based Polyaluminum Ferric Chloride Flocculant: Preparation, Characterization and Flocculation Performance

Cheng

Liu

et al. 2021

Preprint

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“…The release of dye effluents from various industries such as textile dyeing industries, pharmaceuticals, and paper printing industries is a significant concern as they release carcinogenic, toxic, and colored wastewater in the aquatic environment [1]. Conventional technologies such as adsorption [2], coagulation/flocculation [3], trickling filter [4], reverse osmosis [5], and chemical oxidation [6] are used for wastewater treatment [7]. Most technologies give importance to separating the pollutant from the environment, but this has caused the generation of toxic and concentrated residues.…”

Section: Introductionmentioning

confidence: 99%

Rational design of uniformly embedded Cu/CoTe nanoparticles in freestanding rGO sheets for visible light-induced degradation of toxic dyes

Panneerselvam

Dhanasekaran

Dhanavel

et al. 2021

J Mater Sci: Mater Electron

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The future catalytic conversion technologies using an inexpensive catalyst is beneficial as they influence energy-saving and harvest-boosted photocatalytic performances toward environmentally carcinogenic pollutants removal. Here, we demonstrate a feasible hydrothermal-assisted strategy to engineer a novel low-dimensional ordered nanoarchitecture comprising Cu ion-modulated CoTe nanoalloy grown onto reduced graphene nanosheets (rGO/Cu/CoTe nanocomposites) is established for toxic dye removal applications. They are advancing the excellence of Cu ion-modulated CoTe nanoalloy catalytic sites encapsulated carbon sheets for effective electron/hole transport, thus boosting catalytic reactions. This obtained integral nanoarchitecture may enhance ion/mass transportation by the greatly ordered crystalline structure and ease the formation of reactive species, radicals, and intermediate products. The holey rGO/Cu/CoTe displays enhanced photocatalytic performance toward visiblelight-induced photodegradation of toxic dye Methylene Blue (MB) and Methyl Orange (MO). The 98% and 90.3% degradation efficiencies for MB and MO dyes are observed within 180 min, respectively. Furthermore, the influence of cation modulation on the active catalytic sites could be ascribed by a greatly exposed atom on a lateral surface, consequential from an enormous surface area compared to other chalcogen-based carbon nanocomposites.

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“…Cientes do desafio de tratar um resíduo líquido que apresenta composição química de alta complexidade como o lixiviado de aterro sanitário, países da União Europeia e outros países desenvolvidos como Estados Unidos, Japão e Dinamarca tem entendido que o aterro sanitário é a última opção na ordem de hierarquia na gestão dos resíduos sólidos urbanos, sendo enviado para ele apenas os rejeitos, o que aumentaria significantemente sua vida útil e diminuiria o volume de lixiviado produzido, evitando assim sua migração através de solos e subsolos diminuindo a possibilidade de contaminação de águas superficiais e subterrâneas (IYAMU et al, 2020;SAUVE et al, 2020;WANG et al, 2020;NJUKO et al, 2019;CHENG et at., 2020) As tecnologias utilizadas no tratamento do lixiviado variam com base em vários fatores, dentre eles, os mais importantes são a composição química do lixiviado e idade do aterro (CHENG et al, 2020), processos físicos, químicos e biológicos podem ser utilizados, mas é importante salientar, que inevitavelmente o lixiviado de um mesmo aterro vai necessitar de diferentes tipos tecnologias ou tratamentos conjugados, visto que suas características mudam drasticamente com o passar do tempo (CASSANO et al, 2011;L-GOHARY et al, 2016;MIAO et al, 2019;AKKAYAA et al, 2020).…”

Section: Introductionunclassified

Identificação de compostos orgânicos em lixiviado de aterro sanitário durante tratamento por processo fenton

Dantas

Lopes

Sousa

et al. 2021

RICA

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Lixiviado de aterro sanitário é um dos subprodutos da decomposição biológica dos resíduos sólidos urbanos, sendo gerado no interior das células do aterro. Sua composição química está diretamente relacionada a idade a as características dos resíduos sólidos nele dispostos. Lixiviados mais velhos apresentam alto potencial poluidor, devido a presença de alta concentração de material orgânico de difícil biodegradação, macro poluentes inorgânicos, metais pesados e compostos orgânicos xenobióticos, sendo inviável o tratamento biológico. O presente trabalho teve como objetivo avaliar a eficiência do processo Fenton no tratamento de lixiviado proveniente do aterro sanitário da município de Puxinanã-PB, para isso foi realizado a caracterização química do Lixiviado “in natura” (LIN) e do Efluente Fenton (EF), e identificação de compostos orgânicos aplicando cromatografia gasosa acoplada a espectrometria de massa (CG-EM). Analisando os resultados pode-se constatar que o processo Fenton propiciou eficiência média de remoção de DQO total de 87%, cor verdadeira de 98%, COD de 74% e DBO5 de 70%. A relação DBO5/DQO total no EF aumentou em um percentual de 100%, quando comparado ao LIN. O processo Fenton removeu 80% dos compostos orgânicos identificados no LIN, dos 29 compostos que permaneceram no EF, alguns são reconhecidamente tóxicos como o cloro benzeno, bisfenol A, etil-benzeno e o 1-etil-2-metil-Benzeno. Foi constatada, ainda, a formação de 50 novos compostos orgânicos como subprodutos da oxidação de compostos químicos no processo Fenton.

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Landfill leachate wastewater treatment to facilitate resource recovery by a coagulation-flocculation process via hydrogen bond

Cited by 66 publications

References 44 publications

Red Mud-Based Polyaluminum Ferric Chloride Flocculant: Preparation, Characterization and Flocculation Performance

Red Mud-Based Polyaluminum Ferric Chloride Flocculant: Preparation, Characterization and Flocculation Performance

Rational design of uniformly embedded Cu/CoTe nanoparticles in freestanding rGO sheets for visible light-induced degradation of toxic dyes

Identificação de compostos orgânicos em lixiviado de aterro sanitário durante tratamento por processo fenton

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