Chair of Urban Water Systems Engineering, Technical University of Munich, Am Coulombwall 3, 85748 Garching, Germany.
Chair of Urban Water Systems Engineering, Technical University of Munich, Am Coulombwall 3, 85748 Garching, Germany.
Ultrason Sonochem. 2017 Jul;37:464-470. doi: 10.1016/j.ultsonch.2017.02.005. Epub 2017 Feb 7.
The performance of a novel low-maintenance tube reactor for ultrasonic treatment of sludge has been evaluated. The effects of sonication on the release of soluble chemical oxygen demand (sCOD) and anaerobic digestibility of raw and digested sewage sludge as well as agricultural sludge were studied. Results suggest that solubilization and digestibility is dependent on both type of sludge and the energy input. Digested and raw sludge showed high degree of solubilization, however, methane production was only increased for digested sludge. Agricultural sludge was not significantly affected by ultrasonic treatment neither concerning sCOD release nor methane production. The configuration of the ultrasonic system (serial vs. parallel operation) did not show a significant difference in both sCOD release and methane production. However, parallel operation tends to perform better for digested sludge, while serial operation tends to perform better for raw sludge. The strongest effect was observed for the treatment of digested sludge by increasing the methane production by more than 60%, although with a very intensive energy input of more than 5,000kJ per kg total solids. Hence, tube reactors seem to be an attractive alternative to sonotrode-based systems achieving similar performance at low maintenance with great potential especially for digested sludge.
一种新型低维护管式反应器用于污泥超声处理的性能已经得到评估。研究了超声处理对原污泥和消化污泥以及农业污泥中可溶性化学需氧量（sCOD）释放和厌氧消化性的影响。结果表明，溶出度和消化度既取决于污泥的类型，也取决于能量输入。消化污泥和原污泥的溶出度很高，但甲烷产量仅增加了消化污泥。超声处理对农业污泥的 sCOD 释放和甲烷产量均无明显影响。超声系统的配置（串联与并联运行）在 sCOD 释放和甲烷产量方面没有明显差异。然而，对于消化污泥，并联运行的效果更好，而对于原污泥，串联运行的效果更好。对于消化污泥的处理，效果最为显著，甲烷产量增加了 60%以上，尽管总固体物每公斤的能量输入非常高，超过 5000kJ。因此，管式反应器似乎是一种有吸引力的选择，可替代基于超声换能器的系统，以低维护实现类似的性能，对于消化污泥尤其具有很大的潜力。
