Evaluation of organic load measurement techniques in a sewage and waste stabilisation pond

Abstract

A Demanda Bioquímica de Oxigênio (DBO) e a Demanda Química de Oxigênio (DQO) são os principais indicadores rotineiramente utilizados para avaliação de carga orgânica em matrizes de interesse ambiental. Nesse contexto, avaliações da possibilidade de substituição das testes de DBO e DQO por medidas de Carbono Orgânico Dissolvido (COD) são apresentadas para diferentes águas residuárias. Para efluente de lagoa anaeróbia, as seguintes correlações foram obtidas: DQO = 1,08 COD + 79 e DBO = 0,82 COD + 12. Para efluente de lagoa facultativa, DQO = -0,29COD + 109 e DBO = 0,14COD + 26. Para esgoto bruto, DQO = 4,18COD -2 e DBO = 0,46DQO + 5. Para efluente de lagoa aerada, DQO = 3,57COD + 6 e DBO = 0,27DQO + 3. Para efluente de lagoa de decantação, DQO = -1,34COD + 138 e DBO = 0,73COD + 16,5. A determinação de COD não mostrou-se adequada para uma substituição das alternativas clássicas, para as amostras testadas, a despeito das limitações que estas últimas apresentam.

Disinfection and reduction of organic load of sewage water by electron beam radiation

“…The FC faecal coli form, EX excellent, G good, F fair, P poor, H high, M medium, L low (e.g. low demanding or low cost) efficiency of waste water treatment plants and kinetics characteristics of biological process are usually studied through BOD and COD (Aziz and Tebbutt 1980;Fadini et al 2004 andAli Vahdat et al 2010). In aqueous media, the oxidizing hydroxyl radical OH*, the reducing hydrated electron e aq -and the hydrogen radical H* are the predominant products, all of which are highly reactive transient species and are responsible for the various effects including the reduction of pathogens, the oxidation of hazardous organic pollutants and the destruction of molecular structure of targeted pollutants.…”

The Dichromate Method versus the Photoelectrochemical Method: the Synergistic Influence of Turbidity and Chlorides on Chemical Oxygen Demand Analysis

“…[22][23][24][25] Indeed, the two former disadvantages are satisfactorily surmounted, but the chloride still remains as a critical source of errors for that analysis. In a quantitative basis, the maximum acceptable amount of chlorides for PeCOD operation is proportional to the COD range; this information is provided by the instrument manufacturer (Table 2).…”

Study of the Relationship between Organic Content Measures in Water

“…Finally , equations describing the relation between the three parameters has been edited and they can be used to estimate the absent test in accepted accuracy in similar samples to which have been studied in this work. [7] . [8] .…”