Optimization of magnetic field-assisted ultrasonication for the disintegration of waste activated sludge using Box-Behnken design with response surface methodology
Optimization of magnetic field-assisted ultrasonication for the disintegration of waste activated sludge using Box-Behnken design with response surface methodology
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DOI：
10.1016/j.ultsonch.2017.02.024
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发表时间：
2017-09-01
影响因子：
8.4
通讯作者：
She, Pu-ying
中科院分区：
文献类型：
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作者：
Guan, Su;Deng, Feng;She, Pu-ying
本研究首次探讨了利用磁场进行污泥分解的可行性。分选磁场处理后，在180 mT磁场强度下，30 min后可达到41.01%的崩解度。蛋白质和多糖含量显著增加。在磁场强度为119.69 mT、反应时间为30.49 min、pH为9.82的条件下，采用Box-Behnken设计（BBD）和响应面法（RSM）拟合最佳提取条件的多重方程。优化实验结果表明，最佳提取条件的最大提取率为43.75%，蛋白质和多糖含量分别增加到56.71和119.44 mg/L。然后我们分析了超声单独作用的效果。我们率先将磁场与超声波相结合来分解废活性污泥（WAS）。在45 kHz频率下单独应用超声效果最佳，DD约为58.09%。磁场与超声联合治疗DD达62.62%。在磁场强度为197.87 mT、超声频率为42.28 kHz、反应时间为33.96 min、pH为8.90的条件下，采用BBD - RSM法对该联合试验进行优化，得到了最大DD值为64.59%。这些结果与颗粒大小和电镜分析结果一致。这项研究证明，磁场可以有效地瓦解WAS，并可以与其他物理技术如超声相结合，以获得最佳效果。(C) 2017 Elsevier B.V.版权所有
This study investigated for the first time the feasibility of using a magnetic field for sludge disintegration. Approximately 41.01% disintegration degree (DD) was reached after 30 min at 180 mT magnetic field intensity upon separate magnetic field treatment. Protein and polysaccharide contents significantly increased. This test was optimized using a Box-Behnken design (BBD) with response surface methodology (RSM) to fit the multiple equation of the DD. The maximum DD was 43.75% and the protein and polysaccharide contents increased to 56.71 and 119.44 mg/L, respectively, when the magnetic field strength was 119.69 mT, reaction time was 30.49 min, and pH was 9.82 in the optimization experiment. We then analyzed the effects of ultrasound alone. We are the first to combine magnetic field with ultrasound to disintegrate waste-activated sludge (WAS). The optimum effect was obtained with the application of ultrasound alone at 45 kHz frequency, with a DD of about 58.09%. By contrast, 62.62% DD was reached in combined magnetic field and ultrasound treatment. This combined test was also optimized using BBD with RSM to fit the multiple equation of DD. The maximum DD of 64.59% was achieved when the magnetic field intensity was 197.87 mT, ultrasonic frequency was 42.28 kHz, reaction time was 33.96 min, and pH was 8.90. These results were consistent with those of particle size and electron microscopy analyses. This research proved that a magnetic field can effectively disintegrate WAS and can be combined with other physical techniques such as ultrasound for optimal results. (C) 2017 Elsevier B.V. All rights reserved.