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| Author(s): |
Herlane dos Santos Costa
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Carlos. , gráficos, ilustrações, tabelas. |
| Institution: | Universidade de São Paulo (USP). Escola de Engenharia de São Carlos (EESC/SBD) |
| Defense date: | 2003-02-21 |
| Examining board members: |
Luiz Antonio Daniel;
José Roberto Guimarães;
Roque Passos Piveli;
Harry Edmar Schulz;
Mauricio Luiz Sens
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| Advisor: | Luiz Antonio Daniel |
| Field of knowledge: | Engineering - Sanitary Engineering |
| Indexed in: | Banco de Dados Bibliográficos da USP-DEDALUS |
| Location: | Universidade de São Paulo. Biblioteca da Escola de Engenharia de São Carlos; EESC/TESE 1669 |
| Abstract | |
In this research an experimental study of the potentiality of employment of the ozonization was accomplished after anaerobic treatment, in what refers the dose, time of contact, alkalinity, application combined with hydrogen peroxide, amount of consumed ozone and oxidation of organic matter. The proposed study was executed by means of: (a) preliminary studies; (b) preliminary tests; (c) experiment I, using ozone without variation of the affluent alkalinity; (d) experiment II, using ozone with variation of the affluent alkalinity; (and) experiment III, using ozone combined with hydrogen peroxide without variation of the affluent alkalinity; (f) verification of the disinfection; (g) critical analysis of the results. The results were analyzed by means of graphs, it was make itself comparison among analysis parameters, transferred ozone dose and time of contact and among quality of ozonized effluent and quality criterion for effluent reuse. Permitting arrive the following conclusions: (i) the most of the content of consumed ozone during the ozonization is consumed in the first 5 minutes; (ii) the consumed ozone can be better understood analyzing itself the variable applied instant ozone dose; (iii) the behavior from the ozone transference is influenced by three factors: hydrodynamic of the reactor, quantity of ozone available to react and characteristics of the effluent; (iv) the change in pH shows the reached rank of oxidation in the process; (v) the presenceof nitrate favors to oxidation; (vi) the ozonization is a very efficient process to disinfect effluent. The inativation of total and fecal coliforms reached 7,51 and 6,98 Log, respectively; (vii) the mass of ozone controls the rate of COD removal while the medium dose controls the efficiency of COD removal; (viii) with the consumption of ozone of 32,46 +/- 8,19 mg/L in 25 minutes of ozonization, it arrived COD and turbidity medium removals of 48,33 +/- 2,90% and 89,22 +/- 0,35%, respectively; (ix) the addition of hydrogen peroxide improved significantly the efficiency of COD and carbon removal. Without adding hydrogen peroxide, it was needed 25 minutes of ozonization to reach about 25% of COD removal; while that, adding hydrogen peroxide in reason O3/H2O2of approximately 0,30, this time was only 10 minutes and total carbon removal double; (ix) the ozonized e to be submitted an additional treatment before of its discharge in the surface water or its reused. (AU) | |