Research Division of Plasma Processing (RDPP), Department of Physics, Sri Shakthi Institute of Engineering and Technology, L&T Bypass, Chinniyam Palayam (Post), Coimbatore, 641062, India.
Department of Nanoscience and Nanotechnology, Sri Ramakrishna Engineering College, Coimbatore, 641022, India.
Environ Geochem Health. 2021 Feb;43(2):649-662. doi: 10.1007/s10653-019-00446-9. Epub 2019 Nov 2.
One of the major environmental issues of textile industries is the discharge of large quantities of textile effluents, which are source of contamination of water bodies on surface of earth and quality of groundwater. The effluents are toxic, non-biodegradable, carcinogenic and prodigious threats to human and aquatic creatures. Since textile effluents can be treated efficiently and effectively by various advanced oxidation processes (AOPs). Among the various AOPs, cold atmospheric pressure plasma is a promising method among many prominent techniques available to treat the effluents. In this paper, we report about the degradation of simulated effluent, namely Direct Orange-S (DO-S) aqueous solution, using nonthermal atmospheric pressure plasma jet. The plasma treatment of DO-S aqueous solution was carried out as a function of various operating parameters such as potential and treatment time. The change in properties of treated DO-S dye was investigated by means of various analytical techniques such as high-performance liquid chromatography, UV-visible (UV-Vis) spectroscopy and determination of total organic content (TOC). The reactive species present in the samples were identified using optical emission spectrometry (OES). OES results confirmed that the formation of reactive oxygen and nitrogen species during the plasma treatment in the liquid surface was responsible for dye oxidation and degradation. Degradation efficiency, as monitored by color removal efficiency, of 96% could be achieved after 1 h of treatment. Concurrently, the TOC values were found to decrease with plasma treatment, implying that the plasma treatment process enhanced the non-toxicity nature of DO-S aqueous solution. Toxicity of the untreated and plasma-treated dye solution samples was studied using Escherichia coli (E. coli) and Staphylococcus (S. aureus) organisms, which demonstrated that the plasma-treated dye solution was non-toxic in nature compared with untreated one.
纺织工业的主要环境问题之一是大量纺织废水的排放，这些废水是地表水和地下水污染的源头。这些废水是有毒的、不可生物降解的、致癌的，对人类和水生生物构成巨大威胁。由于各种高级氧化工艺（AOPs）可以有效地处理纺织废水。在各种 AOPs 中，冷大气压等离子体是一种很有前途的方法，可用于处理各种现有技术的废水。在本文中，我们报告了使用非热大气压等离子体射流对模拟废水（即直接橙 S（DO-S）水溶液）的降解情况。DO-S 水溶液的等离子体处理是作为各种操作参数（如电势和处理时间）的函数进行的。通过各种分析技术，如高效液相色谱、紫外可见（UV-Vis）光谱和总有机碳（TOC）的测定，研究了处理后 DO-S 染料的性质变化。使用发射光谱法（OES）鉴定了样品中存在的反应性物质。OES 结果证实，在液体表面的等离子体处理过程中形成的活性氧和氮物质是导致染料氧化和降解的原因。通过颜色去除效率监测，在 1 小时的处理后，可达到 96%的降解效率。同时，发现 TOC 值随等离子体处理而降低，这意味着等离子体处理过程增强了 DO-S 水溶液的非毒性。使用大肠杆菌（E. coli）和金黄色葡萄球菌（S. aureus）研究了未经处理和等离子体处理的染料溶液样品的毒性，结果表明，与未经处理的染料溶液相比，等离子体处理后的染料溶液性质是非毒性的。
