Defense University Center, Naval Academy, University of Vigo, Plaza de España 2, 36920 Marín-Pontevedra, Spain.
Int J Environ Res Public Health. 2020 Mar 9;17(5):1777. doi: 10.3390/ijerph17051777.
This study explores the use of natural, ecological coagulant-flocculants to reduce suspended particles in water. Three compounds were tested, namely: diatomaceous earth, calcium lactate and lactic acid. For this purpose, experiments in jar tests were carried out and the best compound was submitted to an optimization in order to evaluate the most significant parameters affecting its use as coagulant-flocculant. First results evidenced that lactic acid remove 71% of the suspended particles during the first five minutes, and up to 83% during the first 15 min. To optimize its use, the range of suspended particles concentration, lactic acid dose and salinity gradient was tested by means of an incomplete 3 factorial design. This technique allows reducing the number of experiments to be carried out through a response surface methodology, which enables to infer the values of the dependent variables in not studied situations, by means of predictive equations. As a result of the experiments carried out, optimal conditions to remove suspended particles were set at a lactic acid concentration of 1.75 g·L. As lactic acid may be obtained biotechnologically from organic wastes, this use supposes a promising area by keeping products and materials in use and contributing to a circular economy.
本研究探讨了利用天然生态混凝剂去除水中悬浮颗粒。测试了三种化合物：硅藻土、乳酸钙和乳酸。为此，进行了搅拌试验，并对最佳化合物进行了优化，以评估影响其作为混凝剂-絮凝剂使用的最重要参数。初步结果表明，乳酸在最初的 5 分钟内去除了 71%的悬浮颗粒，在最初的 15 分钟内去除了 83%。为了优化其使用，通过不完全 3 因子设计测试了悬浮颗粒浓度、乳酸剂量和盐度梯度的范围。该技术允许通过响应面方法减少要进行的实验数量，通过预测方程，可以推断未研究情况下的因变量的值。根据进行的实验，去除悬浮颗粒的最佳条件设定为乳酸浓度为 1.75g·L。由于乳酸可以从有机废物中通过生物技术获得，因此这种用途通过保持产品和材料的使用并促进循环经济，为其提供了一个有前景的领域。
