Rizvi Osama Shaheen, Ikhlaq Amir, Ashar Ubaid Ullah, Qazi Umair Yaqub, Akram Asia, Kalim Imran, Alazmi Amira, Ibn Shamsah Sami M, Alawi Al-Sodani Khaled A, Javaid Rahat, Qi Fei
Institute of Environmental Engineering and Research, University of Engineering and Technology, Lahore, 54890, Pakistan.
Department of Chemistry, College of Science, University of Hafr Al Batin, P.O Box 1803, Hafr Al Batin, 39524, Saudi Arabia.
J Environ Manage. 2022 Dec 1;323:115977. doi: 10.1016/j.jenvman.2022.115977. Epub 2022 Sep 13.
Textile wastewater is ranked highly contaminated among all industrial waste. During textile processing, the consumption of dyes and complex chemicals at various stages makes textile industrial wastewater highly challenging. Therefore, conventional processes based on single-unit treatment may not be sufficient to comply with the environmental quality discharge standards and more stringent guidelines for zero discharge of hazardous chemicals (ZDHC). In this study, a novel approach was followed by recycling Poly aluminum chloride (PACl) and Alum as a catalyst for the first time in the catalytic ozonation treatment process leading to a nascent method after using them as a coagulant in Coagulation/Flocculation. In the current investigation, six different combinations were studied to remove turbidity, TSS, COD, BOD, color, and biodegradability (BOD/COD ratios) of wastewater. Moreover, Central Composite Design was implied using RSM in Minitab software. During the combination of treatment processes, it was found that the pre-coagulation/flocculation with coagulant PACl followed by post-catalytic ozonation with recycled PACl, a more effective treatment than others. The optimum R.E of turbidity, TSS, COD, and color were 84%, 86%, 89%, and 98%, respectively. Moreover, a decrease in toxicity and increase in biodegradability (BOD/COD ratio from 0.29 to 0.54) was observed as well. The electrical energy demand and operational costs of treatment processes were estimated and compared with other treatment processes.
纺织废水在所有工业废水当中被列为高污染废水。在纺织加工过程中，各个阶段对染料和复杂化学品的消耗使得纺织工业废水极具挑战性。因此，基于单一单元处理的传统工艺可能不足以符合环境质量排放标准以及关于危险化学品零排放（ZDHC）的更严格指导方针。在本研究中，首次采用了一种新颖的方法，即在催化臭氧化处理过程中循环利用聚合氯化铝（PACl）和明矾作为催化剂，在将它们用作混凝/絮凝中的混凝剂之后形成一种新方法。在当前的研究中，研究了六种不同的组合，以去除废水的浊度、总悬浮固体（TSS）、化学需氧量（COD）、生化需氧量（BOD）、颜色和生物降解性（BOD/COD 比值）。此外，在 Minitab 软件中使用响应曲面法（RSM）进行中心复合设计。在处理工艺组合过程中，发现先用混凝剂 PACl 进行预混凝/絮凝，然后用循环利用的 PACl 进行后催化臭氧化，这种处理方法比其他方法更有效。浊度、TSS、COD 和颜色的最佳去除率分别为 84%、86%、89%和 98%。此外，还观察到毒性降低以及生物降解性提高（BOD/COD 比值从 0.29 提高到 0.54）。对处理工艺的电能需求和运营成本进行了估算，并与其他处理工艺进行了比较。
