Naraghi Behnaz, Baneshi Mohammad Mehdi, Amiri Reza, Dorost Amin, Biglari Hamed
MSc. of Environmental Health, Senior Lecturer, Department of Environmental Health Engineering, School of Public Health, Birjand University of Medical Sciences, Birjand, Iran.
PhD. of Environmental Health, Assistant Professor, Department of Environmental Health Engineering, School of Public Health, Social Determinants of Health Research Center, Yasuj University of Medical Sciences, Yasuj, Iran.
Electron Physician. 2018 Jul 25;10(7):7086-7094. doi: 10.19082/7086. eCollection 2018 Jul.
Textile wastewater contains a significant amount of bio dye compounds including Reactive Black 5 (RB5) as an Azo dye that causes serious damage to the environment and aquatic life in receiving water resources. It is estimated that approximately 15% of the dyestuff is discharged into water bodies and 50% of those are Azo dyes.
The aim of this study was to examine the effectiveness of combining electrocoagulation and bio-adsorption methods using the active carbons from Kenya tea waste to remove RB5 from aquatic solutions.
Experiments were done in wastewater and the Wastewater laboratory of Gonabad University of Medical Sciences in 2017. Initially, iron electrodes were installed in a 1 L glass container and connected to electrical power with primary dye concentration of 500 mg/l, EC 1000-3000 μs/cm, adsorbent dosage of 0.2-1.0 mg/l, pH 2-9 and electrical potential 30 V. After that, the samples were collected at twenty-minute intervals until the eightieth minute. Performance of dye removal was measured using spectrophotometer techniques (597 nm). Finally, the data were analyzed by descriptive statistics using Microsoft Excel 2017 version.
The findings of this study demonstrated that the highest simultaneous removal performance (96%) was obtained by pH 6, 80-minute reaction time, and EC 3000 μs/cm. With the increasing of reaction time, the energy consumption, electrodes wear, pH, final temperature of effluent, and removal efficiency would increase. Adsorption process could play a small role in the removal of the dye, while it was very effective in improving the performance of the electrocoagulation process.
A combination of the electrocoagulation and adsorption processes can be adopted as an efficient and economical way to treat effluents contaminated with dyestuff.
纺织废水含有大量生物染料化合物，包括作为偶氮染料的活性黑5（RB5），它会对受纳水体中的环境和水生生物造成严重损害。据估计，约15%的染料被排放到水体中，其中50%是偶氮染料。
本研究的目的是检验结合电凝聚和生物吸附方法，使用肯尼亚茶渣制成的活性炭从水溶液中去除RB5的效果。
2017年在戈纳巴德医科大学的废水及废水实验室进行实验。最初，将铁电极安装在1升玻璃容器中，并连接电源，初始染料浓度为500毫克/升，电导率为1000 - 3000微秒/厘米，吸附剂用量为0.2 - 1.0毫克/升，pH值为2 - 9，电势为30伏。之后，每隔20分钟采集一次样品，直至第80分钟。使用分光光度计技术（597纳米）测量染料去除性能。最后，使用微软Excel 2017版本通过描述性统计分析数据。
本研究结果表明，在pH值为6、反应时间80分钟、电导率3000微秒/厘米时，可获得最高的同时去除性能（96%）。随着反应时间的增加，能耗、电极磨损、pH值、出水最终温度和去除效率都会增加。吸附过程在染料去除中作用较小，但其在提高电凝聚过程性能方面非常有效。
电凝聚和吸附过程相结合可作为一种高效且经济的方法来处理受染料污染的废水。
