Research and practice on high-power ultrasonic technology for treating advanced anaerobic digestion sludge
In order to further improve the biogas production capacity of the thermal hydrolysis anaerobic digestion system of a large recycled water treatment plant and explore the feasibility of combining new technologies and equipment,this study used a high-power integrated ultrasonic e-quipment with an average operating power of 3～5 kW and a frequency of 20～40 kHz to test the changes in sludge quality and gas production after ultrasonic treatment under different power rates and reaction times.The results show that as the ultrasound intensity increases,the crushing effect of sludge flocs gradually becomes stronger,and it can effectively release intracellular organic mat-ter;Under certain power and time ultrasound treatment,the SCOD and VFAs of sludge showed a significant upward trend,but the concentration gradually decreased with increasing time;After ul-trasonic treatment,the gas production of anaerobic digestion small-scale trial increased by 10％,5％,and 6％compared to the blank group,respectively.There was no significant change in the proportion of CH4 and CO2 components,but the concentration of H2S decreased significantly,and the abundance of methane producing bacteria increased;After ultrasonic synergistic treatment,the gas production in the digestion tank increased by 6.78％on the basis of 300 m3/tDS,the hydrogen sulfide concentration decreased by 30％,and the abundance of methane producing bacteria in-creased.
Anaerobic digestionUltrasoundGas production rateMicrobial communityRe-cycled water treatment plant
NETL
NSTL
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