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Enhancing aerobic digestion efficiency by pretreatment of sewage sludge
황응주(Eung Ju Hwang),장효(Xiao Zhang),이영옥(Young Ok Lee) 대한환경공학회 2006 대한환경공학회 학술발표논문집 Vol.2006 No.12
In order to destroy the refractory structure of sewage sludge and to increase its solubilisation, the processes of various pretreatments have been carried out using alkaline treatment, ultrasonic treatment and different combination of these two methods: alkaline followed by ultrasonic, ultrasonic followed by alkaline, and the combining method in which ultrasonic treatment is applied to waste sludge dosed with alkaline. For sewage sludge with described pretreatment, the SCOD/TCOD ratio varied from 23% to 42%. And based on SCOD concentration and SCOD/TCOD ratio, the combination pretreatment was more effective than a single treatment, especially the combination of simultaneous alkaline and ultrasonic treatment. Sewage sludge pretreated using simultaneous ultrasonic and alkaline treatment could achieve a maximum SCOD/TCOD ratio of 42% and SCOD of 6700mg/l in only 2 hours. In the aerobic batch test, the performance of digester B was better than that of digester A. TSS and TCOD removal rates of sludge in digester B got to 66% and 79% at 40days of retention time, respectively. And after aerobic digestion, the contents of some heavy metals (Mo, As, Cr, Pb, Ti and Hg) were too low to be available, which suggested that it was feasible to apply the stabilized sludge to agriculture.