This study examined the treatment of surface water using a mixed natural (linseed) and chemical (alum)-based coagulant in terms of color, turbidity, and chemical oxygen demand (COD) (%) removal in a laboratory jar test. Experimental results showed that using a combined coagulant has shown higher removal of color (99.72%) and turbidity (97.76%) at pH values of 3.5 using a 1.5 g/L dosage and a stirring time of 38.58 min. Similarly, at the same pH value and 2.5 g/L dosage, the COD removal was 96%. To determine the optimum value with the highest percent removal efficiency of the coagulation–flocculation process, several experimental parameters including blended dosage, pH, COD concentration, and initial turbidity have been studied in terms of the percent of color, chemical oxygen demand, and turbidity removal. The optimum value was found for the highest removal of color-97.75%, turbidity-96.86%, and COD-90.33% with the pH values of 7.0, at a dosage of 2.5 g/L and a stirring time of 40 min, respectively. Statistical techniques of response surface methodology were used in experimental design and optimization, in order to calculate the confidence intervals to assess population parameter precision. An ANOVA-95% confidence interval ensures that the high reliability optimizes the result. The findings proved the excellent adsorption potential and high performance of the blended coagulant in the removal of contaminants from surface water.

本研究在实验室罐测试中检查了使用混合天然（亚麻籽）和化学（明矾）混凝剂处理地表水的颜色、浊度和化学需氧量 (COD) (%) 去除率。实验结果表明，在 pH 值为 3.5、用量为 1.5 g/L、搅拌时间为 38.58 分钟的情况下，使用组合混凝剂可实现更高的色度去除率 (99.72%) 和浊度去除率 (97.76%)。同样，在相同pH值和2.5 g/L投加量下，COD去除率为96%。为了确定混凝絮凝过程中去除效率最高的最佳值，从色度百分比、化学需氧量和浊度方面研究了混合剂量、pH、COD浓度和初始浊度等多个实验参数。移动。发现pH值为7.0、投加量2.5 g/L、搅拌时间40 min时，颜色去除率最高，为97.75%，浊度为96.86%，COD为90.33%。响应面法的统计技术用于实验设计和优化，以计算置信区间以评估总体参数精度。 ANOVA-95% 置信区间确保高可靠性优化结果。研究结果证明了混合混凝剂在去除地表水中污染物方面具有优异的吸附潜力和高性能。