Dewatering of activated sludge by an oxidative treatment

Annikka Mustranta, Liisa Viikari

Research output: Contribution to journalArticleScientificpeer-review

60 Citations (Scopus)


Different activated sludges from pulp and paper mills were treated with hydrogen peroxide in the presence of ferrous sulphate under different reaction conditions in order to improve the dewatering characteristics of the sludges. The efficiency of the treatment was evaluated on the basis of the specific filtration resistance. Although sludges from different mills varied considerably with respect to their chemical composition and dewatering properties, the specific resistance values of all the sludges could be decreased using rather mild conditions. The filterabilities of the sludges were dependent on reaction temperature, hydrogen peroxide concentration and the reaction time used in the oxidative treatment. Depending on the type of sludge, hydrogen peroxide concentrations of 15 to 30 % mmoles/l sludge were sufficient to decrease the filtration values to a low level at 70°C using a reaction time of 1-2 hours at pH 3.

Original languageEnglish
Pages (from-to)213-221
JournalWater Science and Technology
Issue number1
Publication statusPublished - 1993
MoE publication typeA1 Journal article-refereed
EventSpecialised Conference on Wastewater Sludge Dewatering - Aalborg, Denmark
Duration: 29 Jun 19921 Jul 1992


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