Clarifica??o de ?guas de lavagem de filtros em esta??es de tratamento de ?gua por coagula??o, flocula??o e flota??o por ar dissolvido
Filter backwash water clarification in water treatment plants by coagulation, flocculation and dissolved air flotation
| dc.contributor | Silva, Renato Dantas Rocha da | |
| dc.contributor | http://lattes.cnpq.br/1238105632361487 | |
| dc.contributor | Ara?jo, Andr? Luis Calado | |
| dc.contributor | http://lattes.cnpq.br/7133712883742750 | |
| dc.contributor | Duarte, Marco Ant?nio Calazans | |
| dc.contributor | http://lattes.cnpq.br/2873012508496409 | |
| dc.contributor | Santiago, Rodrigo C?sar | |
| dc.contributor | http://lattes.cnpq.br/6823966481089536 | |
| dc.creator | Braz?o, Abra?o Jhonny da Costa | |
| dc.date | 2018-10-18T16:03:17Z | |
| dc.date | 2018 | |
| dc.date | 2018-10-18T16:03:17Z | |
| dc.date | 2018-08-31 | |
| dc.date.accessioned | 2023-09-27T14:20:21Z | |
| dc.date.available | 2023-09-27T14:20:21Z | |
| dc.identifier | Braz?o, Abra?o Jhonny da Costa. 2018. Clarifica??o de ?guas de lavagem de filtros em esta??es de tratamento de ?gua por coagula??o, flocula??o e flota??o por ar dissolvido. 27 f. Artigo (Mestrado em Ci?ncias Ambientais) ? Instituto Federal de Educa??o, Ci?ncia e Tecnologia do Rio Grande do Norte, Natal, 2018. | |
| dc.identifier | http://memoria.ifrn.edu.br/handle/1044/1561 | |
| dc.identifier.uri | https://repositorioslatinoamericanos.uchile.cl/handle/2250/8921111 | |
| dc.description | This paper presents results of coagulation, flocculation and dissolved air flotation studies that were conducted from bench experiments, validated in a pilot-unit. The experiments were conducted with the purpose of promoting the clarification of filter backwash water (FBW) of a Water Treatment Plant (WTP). The coagulation parameters were investigated from pH adjustments, aluminum chloride dosage and mixing time. The effectiveness of the coagulation was analyzed from the buoyancy of the aggregates. The flotation tests were investigated from the bench saturation efficiency and recirculation rate. The results indicated that the pH and coagulant concentration represented critical conditions in the coagulation step. The best responses were obtained with aluminum 8 mg.L-1, by the use of polyaluminium chloride (PAC). The analysis of the null load point of the ALF microflocs generated after addition of CPA allowed to identify which mechanisms additive to the charge neutralization acted in the coagulation-flocculation system. The pH variation of ALF conditioned with 8 mg.L-1 of Al+3, highlighted the formation of hydrolyzable species and the high activity of colloid charges indicated the occurrence of different mechanisms of the charge neutralization in the coagulation. The maximum clarification in the pilot unit occurred with a dosage of 12 mg.L-1, recirculation ratio of 10%, flocculation time of 15 min and pH 6.5. Flotation presented a significant potential for the FBW, especially regarding the issue of solids removal from the system. More than 11 kilograms of solids can be removed from the treatment system in each backwash cycle compared to sedimentation, which would imply a 33% increase in the time between backwashes and the economy of the station. These benefits can impact water treatment plants in Brazil and worldwide. | |
| dc.description | Este artigo apresenta estudos de coagula??o, flocula??o e flota??o por ar dissolvido que foram conduzidos com o objetivo de promover a clarifica??o de ?guas de lavagens de filtros (ALF) em uma Esta??o de Tratamento de ?gua (ETA) a partir de experimentos de bancada e piloto. A efetividade da coagula??o-flocula??o foi analisada a partir da flotabilidade dos agregados enquanto que ensaios de flota??o foram investigados a partir da efici?ncia de satura??o em bancada e taxa de recircula??o. Os resultados indicaram que o pH e a concentra??o do coagulante representaram condi??es cr?ticas na etapa de coagula??o. As melhores respostas foram obtidas com dosagem de 8 mg.L-1 de cloreto de polialum?nio (CPA). A an?lise da intera??o da superf?cie dos microflocos gerados ap?s adi??o de CPA na ALF, com os contra-?ons presentes na solu??o, permitiu identificar que mecanismos aditivos ? neutraliza??o de cargas atuaram no sistema de coagula??o-flocula??o. A varia??o do pH da ALF condicionada com 8 mg.L-1 de Al+3, destacou a forma??o de esp?cies hidrolis?veis e a elevada atividade das cargas dos coloides indicou a ocorr?ncia de mecanismos diferentes da neutraliza??o de cargas na coagula??o. A m?xima clarifica??o se deu com dosagem de 12 mg.L-1, raz?o de recircula??o de 10%, tempo de flocula??o de 15 min e pH 6,5. Em configura??o otimizada, mais de 11 quilogramas de s?lidos podem ser removidos do sistema de tratamento em cada ciclo de lavagem em compara??o com a sedimenta??o, o que implicaria em um aumento de 33% da carreira de filtra??o e na economicidade da esta??o. | |
| dc.language | por | |
| dc.publisher | Instituto Federal de Educa??o, Ci?ncia e Tecnologia do Rio Grande do Norte | |
| dc.publisher | Brasil | |
| dc.publisher | Natal - Central | |
| dc.publisher | Mestrado Profissional em Uso Sustent?vel dos Recursos Naturais | |
| dc.publisher | Mestrado Profissional em Uso Sustent?vel dos Recursos Naturais | |
| dc.publisher | IFRN | |
| dc.rights | Acesso Aberto | |
| dc.subject | Cloreto de polialum?nio | |
| dc.subject | Efici?ncia de remo??o | |
| dc.subject | Flotabilidade | |
| dc.subject | Polyaluminium chloride | |
| dc.subject | Removal efficiency | |
| dc.subject | Buoyancy | |
| dc.subject | Engenharia Sanit?ria | |
| dc.title | Clarifica??o de ?guas de lavagem de filtros em esta??es de tratamento de ?gua por coagula??o, flocula??o e flota??o por ar dissolvido | |
| dc.title | Filter backwash water clarification in water treatment plants by coagulation, flocculation and dissolved air flotation | |
| dc.type | Disserta??o |