alexa Influence of ozone pre-treatment on sludge anaerobic digestion: removal of pharmaceutical and personal care products.
Toxicology

Toxicology

Journal of Environmental & Analytical Toxicology

Author(s): Carballa M, Manterola G, Larrea L, Ternes T, Omil F, , Carballa M, Manterola G, Larrea L, Ternes T, Omil F,

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Abstract The effect of an oxidative pre-treatment with ozone on the removal of Pharmaceutical and Personal Care Products (PPCPs) during the anaerobic digestion of sewage sludge has been investigated. Besides, the digested sludge characteristics in terms of pathogens content, dewatering properties, heavy metals content and linear alkylbenzene sulfonates (LAS) were determined. During ozonation (20mg O(3)/g TSS), about 8\% of volatile solids (VS) and 60\% of the chemical oxygen demand (COD) were solubilized. However, no mineralization was observed. The elimination of VS and total COD during anaerobic digestion were not affected by ozone treatment with efficiencies ranging from 60\% to 65\%. All PPCPs considered were removed during anaerobic treatment of sludge, with efficiencies ranging from 20\% to 99\%. No significant influence of ozone pre-treatment was observed on PPCPs elimination except for carbamazepine. Pathogens, heavy metals and LAS contents after conventional and pre-ozonation treatment of sewage sludge were below the legal requirements. However, the dewatering properties of sludge were deteriorated when the ozone pre-treatment was applied. This article was published in Chemosphere and referenced in Journal of Environmental & Analytical Toxicology

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