Rapid industrial growth in Bangladesh, especially in the textile industry, has led to water pollution from toxic azo dyes like orange-II, which are harmful to ecosystems and enter the food chain via irrigation. This study examined the use of chemical coagulation (using \({\text{C}}_{6} {\text{H}}_{11} {\text{NO}}_{4} {\text{X}}_{2}\) and \({\text{FeCl}}_{3} \cdot 6{\text{H}}_{2} {\text{O}}\)) and advanced oxidation process (using \({\text{NaOCl}}\)) to treat orange-II dye for irrigation. However, \({\text{C}}_{6} {\text{H}}_{11} {\text{NO}}_{4} {\text{X}}_{2}\) and \({\text{FeCl}}_{3} \cdot 6{\text{H}}_{2} {\text{O}}\) showed limited effectiveness in removing orange-II dye across various pH (3, 6, 9, and 12) levels. In contrast, \({\text{NaOCl}}\) achieved significant dye removal rates of over 90–99%. The study focused on high color removal, limited \({\text{ClO}}_{2}\) and neutral pH after the test. Variables included \({\text{NaOCl}}\) doses (0.5 ml, 2.5 ml, and 5 ml), orange II dye doses (50 mg, 100 mg, and 150 mg) under different pH (3, 6, 8, 9 and 12) conditions. The manuscript is the first to assess orange-II dye using higher doses (2.5 ml and 5 ml) of \({\text{NaOCl}}\) compared to other studies, as an alkaline chemical to neutralize pH levels post-test. The highest dye removal occurred at pH 9 with similar results at other pH levels except pH 12. However, despite effective color removal, the pH remained alkaline at pH 8, 9, and 12 after the test. Hence, optimal experimental conditions of operational parameters were pH = 3 or 6, 2.5 ml \({\text{NaOCl}}\) dose with 100 mg/L or 150 mg/L dye doses. Further research is recommended on the degradation process, toxicological analysis of the final product, and cost-effectiveness for safe irrigation water.

孟加拉国的快速工业增长，尤其是纺织业，导致 orange-II 等有毒偶氮染料对水造成污染，这些染料对生态系统有害，并通过灌溉进入食物链。这项研究考察了化学混凝法（使用 \（{\text{C}}_{6} {\text{H}}_{11} {\text{NO}}_{4} {\text{X}}_{2}\） 和 \（{\text{FeCl}}_{3} \cdot 6{\text{H}}_{2} {\text{O}}\））和高级氧化过程（使用 \（{\text{NaOCl}}\））处理橙色 II 染料进行灌溉。然而，\（{\text{C}}_{6} {\text{H}}_{11} {\text{NO}}_{4} {\text{X}}_{2}\） 和 \（{\text{FeCl}}_{3} \cdot 6{\text{H}}_{2} {\text{O}}\） 在各种 pH 值（3、6、9 和 12）水平上去除橙色 II 染料的效果有限。相比之下，\（{\text{NaOCl}}\） 实现了超过 90-99% 的显着染料去除率。该研究的重点是测试后的高颜色去除率、有限的 \（{\text{ClO}}_{2}\） 和中性 pH 值。变量包括不同 pH 值（3、6、8、9 和 12）条件下的 \（{\text{NaOCl}}\） 剂量（0.5 ml、2.5 ml 和 5 ml）、橙色 II 染料剂量（50 mg、100 mg 和 150 mg）。与其他研究相比，该手稿首次使用更高剂量（2.5 毫升和 5 毫升）的 \（{\text{NaOCl}}\） 作为碱性化学物质来评估橙-II 染料作为测试后中和 pH 值。在 pH 9 时染料去除率最高，在除 pH 12 以外的其他 pH 水平下结果相似。然而，尽管有效地去除了颜色，但测试后 pH 值在 pH 8、9 和 12 时仍呈碱性。因此，操作参数的最佳实验条件是 pH = 3 或 6,2.5 ml \（{\text{NaOCl}}\） 剂量，染料剂量为 100 mg/L 或 150 mg/L。 建议对降解过程、最终产品的毒理学分析以及安全灌溉水的成本效益进行进一步研究。