Treatment of waste activated sludge by means of alkaline hydrolysis under 'mild' conditions
by Maria Cristina Collivignarelli; Marco Sordi; Alessandro Abbà; Federico Castagnola; Giorgio Bertanza
International Journal of Global Warming (IJGW), Vol. 11, No. 3, 2017

Abstract: Proper strategies for reducing the sludge production are a key factor for a correct wastewater treatment plant (WWTP) management. This paper describes an experimental study on sludge thermal alkaline hydrolysis under mild conditions (temperatures from 40 to 70 °C and pH up to 11.5), aimed at sludge minimisation. Tested biological sludge derived from two different WWTPs that treat urban and mixed urban/industrial wastewater, respectively. The experimental results showed: 1) an increase of soluble COD in sludge supernatants; 2) very good biodegradability of the supernatants; 3) improved settleability and dewaterability of treated sludge. The best results were obtained under the following conditions, using lime milk: 70°C, pH 10.0-10.5, contact time 3h.

Online publication date: Sun, 12-Mar-2017

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