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| Water could absorb microwave and increase temperature rapidly within short time. Municipal wastewater treatment plant sewage sludge was used to be heated by microwave digestion reactor. Sludge total solid content (TS) was 2%, 4% and 5%. Microwave heating temperature was 150℃, 170℃ and 190℃, reaction time was 5 minutes. Results show that temperature rising trend from ambient to three specified temperature was similar. Colloid structure was destroyed to release soluble organic components. Dewaterability and settling performance were improved. TS and suspended solid content (SS) reduced. High temperature resulted high SS dissolving ratio. For TS 2% sludge, at 190℃ 40.0% of SS dissolved. |
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| Keywords:microwave, thermal pretreatment, sewage sludge |
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