Jamshidi Arsalan, Rezaei Soheila, Hassani Ghasem, Firoozi Ziba, Ghaffari Hamid Reza, Sadeghi Heybatallah
1Social Determinants of Health Research Center, Yasuj University of Medical Sciences, Yasuj, Iran.
2Department of Environmental health Engineering, Yasuj University of Medical Sciences, Yasuj, Iran.
J Environ Health Sci Eng. 2020 Jan 23;18(1):163-175. doi: 10.1007/s40201-020-00449-0. eCollection 2020 Jun.
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.
由于橡木提取物的分子结构中存在单宁，这种物质被用作天然混凝剂来去除水中的浊度。本研究的目的是确定这种混凝剂单独使用以及与聚合氯化铝（PACl）联合使用在最佳条件下去除水中浊度的效率。在这项实验研究中，采用浸渍法以96%乙醇作为提取剂制备伊朗橡木提取物。使用高岭土制备合成浊水样。通过烧杯试验，在不同初始浊度和pH值下确定了橡木提取物和PACl的最佳浓度。此外，利用中心复合设计（CCD）方法设计实验，并应用响应曲面法（RSM）分析所得结果。橡木提取物和PACl的最佳浓度分别为62.6 mg/L和52.6 mg/L。初始浊度和pH值的增加导致两种混凝剂的浊度去除率增加。橡木提取物和PACl的浊度去除效率分别为63.5%和66.5%。同时使用橡木提取物和聚合氯化铝提高了去除效率（85%），并降低了水中的总有机碳浓度（TOC）（42.3%）。结果表明，同时使用伊朗橡木提取物和聚合氯化铝在去除水中浊度方面具有可接受的性能。
