Abstract
Ozonation of activated sludge in the present of titanium dioxide (TiO2) as catalyst to enhance the production of hydroxyl radical was evaluated in comparison to the sole ozonation process. In this process, the catalytic ozontion showed improvement in increasing ozone consumption and improving activated sludge disintegration and solubilisation. The reduction of total suspended solid (TSS), volatile suspended solid (VSS) and soluble chemical oxygen demand (SCOD) solubilisation was better in the catalytic ozonation system. Initial pH 7 of activated sludge was found best to disintegrate and solubilise the sludge flocs. However upon additional of sodium hydroxide (NaOH) in pH adjustment enhanced the solubilisation of organic matter from the flocs and cells, making the initial pH 9 is the best condition for activated sludge solubilisation. Yet the initial pH 7 of activated sludge supernatant was the best condition to achieve SCOD solubilisation due to sludge floc disintegration, when it had stronger correlation between TSS reduction and SCOD solubilisation (R2=0.961). Lower amount of catalyst of 100 mgTiO2/gTSS was found to disintegrate and solubilise the activated sludge better with 30.4% TSS reduction and 25.2% SCOD solubilisation efficiency, compared to 200 mgTiO2/gTSS with 21.9% and 17.1% TSS reduction and SCOD solubilisation, respectively.
Highlights
The activated sludge is a biological process involves microorganism in organic pollutant degradation in the wastewater [1]
The synthesized TiO2 was estimated by the DIFFRAC.EVA Software to be in size of 64.4 nm and tetragonal lattice structure
The efficiency of sludge ozonation with synthesized TiO2 as catalyst was evaluated in this paper
Summary
The activated sludge is a biological process involves microorganism in organic pollutant degradation in the wastewater [1]. Domestic and industrial wastewater treatment system adopted this method in organic pollutant degradation because of high efficiency. The following process of cryptic growth and degradation of organic pollutant is retarded. Lysis is a process to break the sludge cell so that the intracellular organic matter solubilised in supernatant and became the food source for endogenous bacteria, while part of it will be oxidized into water and carbon dioxide. The damage sludge structure and cell contribute to reduction volume of the activated sludge
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