工业化规模超声波预处理对不同固体浓度污泥厌氧消化性能的影响

Effect of full-scale ultrasonic pretreatment on anaerobic digestion performance of sludge with different solid concentrations

针对活性污泥厌氧消化水解速率慢的问题,通过工业化规模超声波反应器对不同固体浓度污泥开展了破解研究。采用粒径分析及溶解性COD、蛋白质和多糖浓度监测的方法研究了超声波破解前后污泥物理化学特性的变化;评估了超声波破解对污泥厌氧消化产甲烷潜力及有机物降解规律的影响。结果表明:工业化规模超声波破解不同固体浓度污泥后,污泥粒径均有所降低,而溶解性COD、蛋白质和多糖的浓度均有增加;超声波对污泥的破解程度与破解时间和固体浓度有关,其随破解时间增加而增加,随污泥固体浓度增加而减弱;超声波破解固体浓度2%和4%的污泥30 min后,累积甲烷产率分别提升41.2%和30.2%,当破解时间和固体浓度进一步增加时,污泥甲烷产率无明显变化。本研究结果可为超声波破解污泥技术的工业化应用提供参考。

To resolve the problem of low hydrolysis rate of activated sludge during anaerobic digestion process,an industrial scale ultrasonic reactor was used to disintegrate excess sludge under different solid concentrations.The physical and chemical characters of sludge before and after ultrasonic disintegration were evaluated in terms of particle size,and soluble COD,protein,carbohydrate.Effects of ultrasonic disintegration on cumulative methane yield and organism decomposition during anaerobic digestion process were studied.The results indicated that with the pretreatment of ultrasonic operation,the particle size of sludge was reduced,while an obvious increase of the concentrations of SCOD,soluble protein and carbohydrate occurred.The disintegration degree increased with sonication time extension,and decreased with the increase of solid concentrations.After30 min ultrasonic pretreatment of 2%and 4%TS sludge,their methane yield increased up to 41.2%and 30.2%,respectively.However,there was no obvious increase of methane yield as ultrasonic time and sludge TS further increased.Through above research,the results provide technological support for ultrasonic pretreatment at industrial scale.