Freshwater is only 2.5% of the total water on the Earth and rest is contaminated or brackish. Various physical and chemical techniques are being used to purify the contaminated water. This study deals with catalytic plasma treatment of contaminated water collected from different sites of Faisalabad-Pakistan. A non-thermal DC plasma jet technique was used to treat the water samples in the presence of TiO₂ catalyst. The plasma-assisted catalytic treatment introduced some oxidative species (O₃, H₂O₂, HO₂⁻, OH⁻) in the water. These species reacted with pollutants and cause the degradation of harmful contaminants, especially dyes. The degradation of dye sample during plasma treatment was more pronounced as compared to other samples. pH, conductivity and TDS of dye containing sample decreased after catalytic plasma treatment. The degradation of organic pollutants increased due to presence of several oxidants, such as TiO₂, ferrous ions and hydrogen peroxide. FT-IR analysis revealed the degradation of some functional groups during treatment process and confirmed the effectiveness of the process. The residue of the treated samples was consisted of amines, amides and N-H functional groups. XRD analysis showed the presence of Alite, Ferrite, aluminate, Si, S and some heavy metals in the residue. The effect of plasma treatment on activity of gram-negative Escherichia coli (E. coli) bacteria in water was also checked. The bacterial activity was reduced by almost 50% after 2 min of plasma treatment.

中文翻译：

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非热等离子体射流暴露下的工业废水的催化和非催化处理

淡水仅占地球总水量的2.5％，其余部分被污染或微咸。各种物理和化学技术正在被用来净化被污染的水。这项研究涉及从费萨拉巴德-巴基斯坦不同地点收集的污水的催化等离子体处理。在TiO ₂催化剂存在下，使用非热DC等离子体喷射技术处理水样品。等离子体辅助催化处理引入了一些氧化性物质（O ₃，H ₂ ö ₂，HO ₂ ^-，OH ^-） 在水里。这些物质与污染物反应，导致有害污染物，尤其是染料的降解。与其他样品相比，等离子体处理过程中染料样品的降解更为明显。催化等离子体处理后，含染料样品的pH，电导率和TDS降低。由于多种氧化剂（例如TiO _2）的存在，有机污染物的降解增加，亚铁离子和过氧化氢。FT-IR分析揭示了在处理过程中某些官能团的降解，并证实了该过程的有效性。处理的样品的残余物由胺，酰胺和NH官能团组成。XRD分析表明残留物中存在铝石，铁素体，铝酸盐，硅，硫和一些重金属。还检查了血浆处理对水中革兰氏阴性大肠杆菌（E. coli）细菌活性的影响。血浆处理2分钟后，细菌活性降低了近50％。