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Previous issue date: 2016-08-02 / ?guas com turbidez e cor aparente baixas a moderadas s?o eventualmente
desafiadoras para tratar, principalmente em Esta??es de Tratamentos de ?gua
(ETAs) de ciclo completo com clarifica??o por decanta??o (ETAs ?convencionais?).
Esse tipo de ?gua pode ser coagulada no mecanismo de varredura, geralmente com
dose de coagulante elevada, a fim de produzir flocos sediment?veis que sejam
removidos no decantador. Contudo a coagula??o no mecanismo de adsor??o e
neutraliza??o de cargas ? vantajosa, com dose usualmente mais baixa, sendo que,
nesse caso, haver? apenas a desestabiliza??o das part?culas e a forma??o de flocos
muito pequenos (n?o sediment?veis) que ser?o removidos nos filtros. Em alguns
casos a ETA possibilita o by-pass da ?gua diretamente para os filtros (com ou sem
pr?-flocula??o), pois as unidades de decanta??o praticamente perdem sua fun??o e
a ETA, embora fisicamente seja configurada como de ciclo completo, opera como
um sistema de filtra??o direta. Apesar das vantagens desta configura??o, ?
geralmente mais dif?cil para o operador encontrar a dose e pH adequados para
coagula??o no mecanismo de adsor??o e neutraliza??o de cargas. O objetivo deste
trabalho foi adequar uma ETA com tais caracter?sticas. Fizemos ensaios em jarteste
simulando a tecnologia de ciclo completo e de filtra??o direta descendente, e
tratamentos como pr?-oxida??o, coagula??o, pr?-oxida??o com coagula??o e
adsor??o com coagula??o, variando as doses dos respectivos produtos em cada
tratamento e em pH diferentes. Todos os tratamentos realizados atenderam a
Portaria 2.914/11 para cor aparente, por?m somente os tratamentos em que houve a
coagula??o atenderam para turbidez e cor aparente simultaneamente, sendo os
melhores resultados do tratamento de pr?-oxida??o com coagula??o. / Water with turbidity and color apparent low to moderate are sometimes challenging
to treat, especially in Water Treatment Plants (WTP) of full cycle with clarification by
decantation (WTPs "conventional") because should be coagulated preferably in
adsorption-neutralization mechanism loads. Such water can be coagulated in the
sweep mechanism, generally with a high dose of coagulant, to produce settleable
flocs which are removed in the decanter. However, it is also possible, in an
advantageous overall, making the water coagulation at adsorption and charge
neutralization mechanism with usually lower dose, and in this case there will be only
a destabilization of the particles and formation of tiny floc (not settleable) to be
removed on the filters. In some cases WTP enables the bypass of water directly to
the filter (with or without pre-flocculation), since the decantion units practically lost its
function and ETA, although it is physically configured as a complete cycle, it operates
as a direct filtration system. Despite the advantages of this configuration, it is
generally more difficult for the operator to find the dose and pH suitables for the
adsorption and charge neutralization mechanism. The objective was to adapt a WTP
with such characteristics. We did jartest tests simulating the complete cycle and
downstream direct filtration, and treatments as pre-oxidation, coagulation, preoxidation
with coagulation and adsorption coagulation, varying dosages of the
respective products in each treatment and at different pH. All treatments performed
attended Ordinance 2.914/11 for apparent color, but only the treatments in which
there was coagulation attended for turbidity and apparent color simultaneously, and
the best results of treatment of pre-oxidation with coagulation.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/22087 |
| Date | 02 August 2016 |
| Creators | Silva, Michell Smith Gomes da |
| Contributors | 75200252415, http://lattes.cnpq.br/9048384392428073, Sena, Rennio Felix de, 02856940498, http://lattes.cnpq.br/1964398358506333, Duarte, Marco Ant?nio Calazans, 20175892415, http://lattes.cnpq.br/2873012508496409, Ara?jo, Andr? Luis Calado, Santos, H?lio Rodrigues dos |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA SANIT?RIA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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