Because of the presence of tannin in the molecular structure of oak extract, this substance is used as a natural coagulant to remove turbidity from water. The aim of this study was to determine the efficiency of this coagulant alone and in combination with polyaluminium chloride (PACl) in turbidity removal from water under optimal conditions. In this experimental study, Iranian oak extract was prepared by maceration method using ethanol 96% as an extractor. Kaolin was used to prepare synthetic turbid water samples. Using the jar test, the optimum concentrations of oak extract and PACl were determined in various concentrations of initial turbidity and pH. Moreover, the central composite design (CCD) method was utilized to design experiments and RSM was applied for analyzing the obtained results. Optimum concentrations of oak extract and PACl were 62.6 mg/L and 52.6 mg/L, respectively. An increase in initial turbidity and pH led to an increase in turbidity removal by the two coagulants. The efficiency of turbidity removal by oak extract and PACl was 63.5% and 66.5%, respectively. The simultaneous application of oak extract and polyaluminium chloride increased removal efficiency (85%) and reduced the total organic carbon concentration (TOC) in water (42.3%). The results showed that the simultaneous application of Iranian oak extract and polyaluminium chloride had an acceptable performance in removing turbidity from water.

中文翻译：

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伊朗橡树提取物（天然栎树提取物）具有天然凝结作用，具有去除水中混浊的潜力。

由于橡木提取物的分子结构中存在单宁，因此该物质用作天然凝结剂，可去除水中的浊度。这项研究的目的是确定在最佳条件下，该混凝剂单独使用或与聚氯化铝（PACl）结合使用时从水中去除浊度的效率。在本实验研究中，采用96％乙醇作为提取剂，通过浸渍法制备了伊朗橡木提取物。高岭土用于制备合成混浊水样品。使用广口瓶测试，在各种初始浊度和pH值浓度下，确定了橡木提取物和PACl的最佳浓度。此外，采用中央复合设计法（CCD）进行设计实验，并采用RSM对获得的结果进行分析。橡树提取物和PACl的最佳浓度分别为62.6 mg / L和52.6 mg / L。初始浊度和pH的增加导致两种混凝剂去除浊度的增加。橡树提取物和PAC1去除浊度的效率分别为63.5％和66.5％。橡木提取物和聚氯化铝的同时应用提高了去除效率（85％），并降低了水中的总有机碳浓度（TOC）（42.3％）。结果表明，同时施用伊朗橡木提取物和聚氯化铝在去除水中的浊度方面具有可接受的性能。分别。橡木提取物和聚氯化铝的同时应用提高了去除效率（85％），并降低了水中的总有机碳浓度（TOC）（42.3％）。结果表明，同时施用伊朗橡木提取物和聚氯化铝在去除水中的浊度方面具有可接受的性能。分别。橡木提取物和聚氯化铝的同时应用提高了去除效率（85％），并降低了水中的总有机碳浓度（TOC）（42.3％）。结果表明，同时施用伊朗橡木提取物和聚氯化铝在去除水中的浊度方面具有可接受的性能。