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Abstract：
Dairy farm slurry is an important biomass resource that can be used as a fertilizer and in energy utilization and chemical production. This study aimed to establish an innovative ultrasound-assisted electrochemical oxidation (UAEO) digestion method for the rapid and onsite analysis of the heavy metal (HM) contamination level of dairy slurry. The effects of UAEO operating parameters on digestion efficiency were tested based on Cu and Zn concentrations in a dairy slurry sample. The results showed that Cu and Zn digestion efficiency was (96.8 ± 2.6) and (98.5 ± 2.9)%, respectively, with the optimal UAEO operating parameters (digestion time: 45 min; ultrasonic power: 400 W; NaCl concentration: 10 g/L). The digestion recovery rate experiments were then operated with spiked samples to verify the digestion effect on broad-spectrum HMs. When the digestion time reached 45 min, all digestion recovery rates exceeded 90%. Meanwhile, free chlorine concentration, particle size distribution, and micromorphology were investigated to demonstrate the digestion mechanism. It was found that 414 mg/L free chorine had theoretically enough oxidative ability, and the ultrasound intervention could deal with the blocky undissolved particles attributed to its crushing capacity. The results of particle size distribution showed that the total volume and bulky particle proportion had an obvious decline. The micromorphology demonstrated that the ultrasound intervention fragmented the bulky particles, and electrochemical oxidation made irregular blocky structures form arc edge and cellular structures. The aforementioned results indicated that UAEO was a novel and efficient method. It was fast and convenient. Additionally, it ensured digestion efficiency and thus had a good application prospect.
摘要：
奶牛场浆料是一种重要的生物质资源，可用作肥料，可用于能源利用和化工生产。本研究旨在建立一种创新的超声辅助电化学氧化（UAEO）消解方法，用于快速和现场分析乳浆中重金属（HM）的污染水平。基于乳浆样品中的Cu和Zn浓度测试了UAEO操作参数对消化效率的影响。结果表明,铜和锌的消解效率分别为(96.8±2.6)和(98.5±2.9)%,分别,优化UAEO操作参数(消化时间:45min;超声功率:400W;NaCl浓度:10g/L)。然后用加标样品进行消化回收率实验，以验证对广谱HMs的消化效果。当消化时间达到45min时，所有消化回收率均超过90%。同时,游离氯浓度,粒度分布，和微观形态进行了研究，以证明消化机制。发现414mg/L游离氯具有理论上足够的氧化能力，超声干预可以处理由于其破碎能力而导致的块状不溶解颗粒。粒度分布结果表明，总体积和体积颗粒比例有明显下降。微观形态表明，超声干预使大块颗粒破碎，电化学氧化使不规则的块状结构形成弧形边缘和细胞结构。上述结果表明UAEO是一种新颖有效的方法。这是快速和方便。此外,保证了消化效率,具有良好的应用前景。
