Behavior of inorganic elements during sludge ozonation and their effects on sludge solubilization

Comparative evaluation of anaerobic digestion for sewage sludge and various organic wastes with simple modeling

“…Around 20-40% of Mg and around 10-20% of Ca were soluble, regardless of the temperature conditions. Sui et al (2011) performed ozonation of activated sludge to reduce sludge generation, and reported that K and Mg were solubilized at a higher ratio than COD solubilization, while the solubilized ratio of Ca was lower. Nagare et al (2012) showed that more than 80% of P and K and around 60% of Ca and Mg were extracted from powdered mature corn using distilled water at 20°C and 80°C, regardless of the temperature difference.…”

Holistic sludge management through ozonation: A critical review

“…Sui et al (2011) observed that calcium and magnesium had negligible impact on sludge solubilisation, but iron prevented the destruction of sludge flocs. Sludge with high iron content (80-120 mg Fe/g SS) had 50% lower solubilisation efficiency than sludge with low iron (4.7-7.4 mg Fe/SS).…”

“…Sludge solubilisation results in the release of nitrogenous species, mostly in the form of organic nitrogen (Déléris et al, 2000;Qiang et al, 2015;Sui et al, 2011). In sludge, ozonation can further oxidize a fraction of the released organic nitrogen (e.g., 30%) to ammonia (Deleris et al, 2002;Sui et al, 2014).…”

A multivariate approach of changes in filamentous, nitrifying and protist communities and nitrogen removal efficiencies during ozone dosage in a full-scale wastewater treatment plant

“…During the sequential decomposition processes produced by the ozonation in AS, organic matter and debris are released from the microbial cells (Komanapalli and Lau, 1996). The leakage of these soluble substrates results in an increase of soluble chemical oxygen demand (sCOD), nitrogen and phosphorous loading rates in the reactor (Demir and Filibeli, 2012;Sui et al, 2011), producing indirect impacts on microorganisms during ozonation (Yapsakli et al, 2010). These potential impacts are in addition to direct effect of ozonation on microorganism activity and mortality rates, which depend on each species and their location in the floc (Bölhler and Siegrist, 2004;Fall et al, 2017).…”