• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Agricultural mechanization in Asia, Africa and Latin America >A Contribution of Foam Separation Technique and Electro-Coagulation for Dairy By-Products Treatment
【24h】

A Contribution of Foam Separation Technique and Electro-Coagulation for Dairy By-Products Treatment

机译：泡沫分离技术和电凝技术对乳制品副产品的贡献

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Electro-Sonic treatment of dairy industry wastewater was investigated using a combined system comprising of electro-coagulation and ultrasonication processing. Dairy industry wastewater is characterized by high chemical oxygen demand and other pollutants. The objective of this research was to investigate the effects of the investigated variables such as: applied current density of 1, 2, 4 and 6 mA/ cm~2 which agrees 0.5, 1, 2 and 3A; processing times of 15, 30, 45, 60 and 75 minutes; initial protein concentrations of 100, 200 and 300 mg/ L; ultrasonic frequency of 40 and 60 kHz; ultrasonic power of 100 and 200W and polarity changes state, with or without polarity change. For this purpose, rectangular aluminum anodes and iron cathodes were used in parallel within the separation column. Peripheral device was built to control the electrodes polarity. Six ultrasonic transducers were installed on the separation column wall in front of the inner electrodes from the three perpendicular dimensions. Bubbles created were categorized microscopically into two identities, microbubbles and nanobubbles. The bubble sizes in each identity were acknowledged into nominal groups according to their nominal diameter as a partial percent of the whole identity, which called intensity percentage of each group. The nominal groups of nanobubbles are 500, 800 and 1,100 nm. However, the microbubbles are 1,500, 2,100, 3,100 and 4,100 nm. As all the operating parameters potential of electro-sonic device increase the intensity percentage of the bubbles of 500 and 1,500 nm were tend to be intensified, which interprets the removal potential of chemical oxygen demand was raised and able to achieve a 94.2% removal at a current density of 6 mA/cm~2, ultrasonic power of 200W, ultrasonic frequency of 60 kHz and change the electrode polarity every 30 seconds after 75 minutes of processing time which has removal efficiency index of 3,228.1 mg/kWh. The highest removal efficiency index of 5,013.3 mg/kWh can be obtained at electrical current of 1A (2 mA/cm~2); ultrasonic power of 100W; ultrasonic frequency of 60 kHz and with polarity change. Protein separation as another result was evaluated by recovery percent; enrichment and separation ratios. Generated bubble size in liquid phase and bubble coalescence and drainage in the foam phase are the major factors affect recovery, separation ratio and hence enrichment. Large bubbles lead into higher bubble drainage with less liquid holdup or less foam volume that has more protein content or concentrated, whereas smaller bubbles increase the surface area, which increase liquid holdup or higher foam volume or less concentration. The highest separation ratio of 54.16 obtained at electrical current of 0.5A, ultrasonic power 100W and frequency of 40 kHz. The tolerance among the three factors, bubble size, coalescence and drainage configures the optimal points of separation. The optimal points of foam separation were determined to be generally at ultrasonic power of 100W. The addition of ultrasonic to the electrocoagulation further increases the treatment efficiency. These results demonstrate the viability of coupled electro-coagulation with ultrasoni-cation process as a reliable technique for pollutants removal from dairy processing wastewater.
机译：使用包括电凝和超声处理的组合系统研究了乳业废水的电声处理。乳业废水的特点是化学需氧量高和其他污染物。这项研究的目的是研究所研究变量的影响，例如：施加的电流密度分别为1、2、4和6 mA / cm〜2，符合0.5、1、2和3A；处理时间为15、30、45、60和75分钟；初始蛋白质浓度为100、200和300 mg / L; 40和60 kHz的超声波频率;超声波功率分别为100和200W，并且极性改变状态，无论是否改变极性。为此，在分离塔内平行使用矩形铝阳极和铁阴极。建立外围设备来控制电极的极性。从三个垂直方向将六个超声换能器安装在内部电极前面的分离柱壁上。产生的气泡在微观上分为两个标识，即微气泡和纳米气泡。每个标识中的气泡大小根据其公称直径（占整个标识的部分百分比）确认为标称组，称为每个组的强度百分比。纳米气泡的标称组是500、800和1100 nm。然而，微泡是1,500、2,100、3,100和4,100 nm。随着电声设备的所有工作参数电势的增加，气泡强度的500和1,500 nm的强度百分比趋于增强，这解释了化学需氧量的去除电势提高了，并且能够在9℃下实现94.2％的去除率。电流密度为6 mA / cm〜2，超声功率为200W，超声频率为60 kHz，在经过75分钟的处理时间后每30秒改变电极极性，去除效率指数为3,228.1 mg / kWh。电流为1A（2 mA / cm〜2）时，去除效率最高指数为5,013.3 mg / kWh；超声波功率100W；超声频率为60 kHz，并且极性改变。通过回收率评估蛋白质分离的另一结果。富集和分离比。液相中产生的气泡尺寸以及泡沫相中气泡的聚结和排出是影响回收率，分离比并因此影响富集的主要因素。大气泡会导致较高的气泡排出率，从而减少液体滞留量或具有更多蛋白质含量或浓缩的泡沫量，而较小的气泡会增加表面积，从而增加液体滞留率或增加泡沫量或降低浓度。在电流为0.5A，超声功率为100W，频率为40 kHz时获得的最高分离比为54.16。气泡尺寸，聚结和排水这三个因素之间的公差构成了最佳分离点。确定泡沫分离的最佳点通常是在100W的超声功率下。向电凝中添加超声波可进一步提高治疗效率。这些结果证明了电凝与超声法结合作为从乳品加工废水中去除污染物的可靠技术的可行性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号