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Carbon catalysts derived from compost for wet peroxide oxidation of landfill leachates
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Advisor(s)
Abstract(s)
O constante crescimento populacional levou a um grande aumento na produção de resíduos sólidos,
principalmente resíduos sólidos urbanos (RSU). Uma estratégia ecologicamente correta para gerenciar os RSU
é o tratamento mecânico e biológico (TMB). Nas unidades TMB, a fração orgânica dos RSU é tratada, gerando
biogás e subprodutos (lixiviado e composto). O composto é ultilizado principalmente como fertilizante
agrícola. No entanto, a quantidade de composto produzida é superior à sua procura como fertilizante, criando
um excesso de produto. Este trabalho visa a valorização do composto através de carbonização hidrotérmica
(CHT), e pirólise, produzindo os catalisadores HC230 e PC800, respectivamente, e sua aplicação na oxidação
catalítica com peróxido de hidrogénio (CWPO) do lixiviado gerado na unidade TMB. Os catalisadores foram
caracterizados por análise elementar e teor de cinzas. Os ensaios de CWPO do lixiviado (COT = 27 g L-1,
DQO = 60 g L-1 e DBO5 = 23 g L-1) foram conduzidos nas seguintes condições operacionais: CCatalisador = 1,8
g L-1; T = 80 ºC; CH2O2 = 85,7 g L-1 e pH de 3,0 a 7,3. A pH = 6, o catalisador HC230 permitiu alcançar uma
redução de DQO de 41%, aumentar a razão DBO5/DQO para 0,42, moldando o lixiviado como adequado para
tratamento biológico posterior
The population growth leads to a large increase in solid waste production, notably municipal solid waste (MSW). In this context, the mechanical and biological treatment (MBT) arouses as an environmentally friendly strategy to manage MSW. In MBT plants, the organic fraction of MSW is treated, generating biogas and, as by-products, leachate and compost. The compost is mainly used as an agriculture fertilizer. However, the amount of compost produced is higher than its demand, resulting in excess and accumulation. This work deals with the valorization of compost through hydrothermal carbonization (HTC) and pyrolysis, producing respectively the catalysts HC230 and PC800, and their application in the catalytic wet peroxide oxidation (CWPO) of the leachate waters generated in the MBT plant. The catalysts were characterized by elemental analysis and ash content. The CWPO runs of the leachate waters (TOC = 27 g L-1, COD = 60 g L-1 and BOD5 = 23 g L-1) were conducted under the following operating conditions: CCatalyst = 1.8 g L-1; T = 80 ºC; CH2O2 = 85.7 g L-1 and pH from 3.0 to 7.3. At pH = 6 the HC230 achieved a COD abatement of 41 %, enhancing the BOD5/COD ratio to 0.42, shaping the leachate as suitable for further biological treatment
The population growth leads to a large increase in solid waste production, notably municipal solid waste (MSW). In this context, the mechanical and biological treatment (MBT) arouses as an environmentally friendly strategy to manage MSW. In MBT plants, the organic fraction of MSW is treated, generating biogas and, as by-products, leachate and compost. The compost is mainly used as an agriculture fertilizer. However, the amount of compost produced is higher than its demand, resulting in excess and accumulation. This work deals with the valorization of compost through hydrothermal carbonization (HTC) and pyrolysis, producing respectively the catalysts HC230 and PC800, and their application in the catalytic wet peroxide oxidation (CWPO) of the leachate waters generated in the MBT plant. The catalysts were characterized by elemental analysis and ash content. The CWPO runs of the leachate waters (TOC = 27 g L-1, COD = 60 g L-1 and BOD5 = 23 g L-1) were conducted under the following operating conditions: CCatalyst = 1.8 g L-1; T = 80 ºC; CH2O2 = 85.7 g L-1 and pH from 3.0 to 7.3. At pH = 6 the HC230 achieved a COD abatement of 41 %, enhancing the BOD5/COD ratio to 0.42, shaping the leachate as suitable for further biological treatment
Description
Keywords
Resíduos sólidos urbanos Valorização Catalisadores à base de carbono águas lixiviantes Tratamento de águas residuais Research Subject Categories::NATURAL SCIENCES::Chemistry
Pedagogical Context
Citation
Batista, Gabriel de Freitas; Roman, Fernanda; Díaz de Tuesta, Jose Luis; Silva, Adrián; Gomes, Helder (2022). Carbon catalysts derived from compost for wet peroxide oxidation of landfill leachates. In XXVIII Congresso Ibero-Americano de Catálise. Natal: Sociedade Brasileira de Catálise. p. 1-6. ISBN 978-989-8124-23-4
Publisher
Sociedade Brasileira de Catálise