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Relative influence of process variables during non-catalytic wet oxidation of municipal sludge
Journal article   Peer reviewed

Relative influence of process variables during non-catalytic wet oxidation of municipal sludge

S Baroutian, Anne-Marie Smit and D J Gapes
Bioresource Technology, Vol.148, pp.605-610
2013
DOI: https://doi.org/10.1016/j.biortech.2013.08.160
url
https://doi.org/10.1016/j.biortech.2013.08.160View
Published Version

Abstract

wet oxidation municipal sludge wastewater response surface methodology
Individual and interactive effects of process variables on the degradation of fermented municipal sludge were examined during wet oxidation. The process was carried out at 220-240. °C using 1:1-2:1 oxygen to biomass ratio and 300-500. rpm stirring speed. Response surface methodology coupled with a faced-centred central composite design was used to evaluate the effect of these variables on total suspended solids, volatile suspended solids and total chemical oxygen demand. Multivariate analysis was conducted for the initial and near completion stages of reaction: 5 and 60. min treatments, respectively. Temperature had the most significant effect on degradation rate throughout. During the initial stage the effect of mixing intensity was less significant than that of oxygen ratio. Mixing intensity did not influence degradation rate at the later stage in the process. During the near completion stage, the interaction of temperature and oxygen ratio had significant effect on sludge degradation.

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Agricultural Engineering
Biotechnology & Applied Microbiology
Energy & Fuels

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#6 Clean Water and Sanitation

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