Journal
BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING
Volume 34, Issue 1, Pages 85-92Publisher
BRAZILIAN SOC CHEMICAL ENG
DOI: 10.1590/0104-6632.20170341s20150466
Keywords
Sludge digestion; Potassium ferrate; Pre-treatment; Sonication; Waste Activated Sludge (WAS)
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Funding
- Nevsehir Haci Bektas Veli University, Research Fund Foundation [NEUBAP14F16]
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The effects of sonication, potassium ferrate (K2FeO4) oxidation and their simultaneous combination (called sono-oxidative pre-treatment) on chemical properties and anaerobic digestion of waste activated sludge (WAS) were investigated and compared comprehensively. Based on chemical parameters, the optimum operating conditions were found to be 0.3 g K2FeO4/g total solids (TS) dosage for 2-h individual K2FeO4 oxidation, 0.50 W/mL ultrasonic power density for 10-min individual sonication and, lastly, the combination of 2.5-min sonication at 0.75 W/mL ultrasonic power density with 2-h chemical oxidation at 0.3 g K2FeO4/g TS dosage for sono-oxidative pre-treatment. The disintegration efficiencies of these methods under the optimized conditions were in the following descending order: 37.8% for sono-oxidative pretreatment > 26.3% for sonication > 13.1% for K2FeO4 oxidation. The influences of these methods on anaerobic biodegradability were tested with the biochemical methane potential assay. It was seen that the cumulative methane production increased by 9.2% in the K2FeO4 oxidation reactor, 15.8% in the sonicated reactor and 18.6% in the reactor with sono-oxidative pre-treatment, compared to the control (untreated) reactor.
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