Department of Biotechnology, Noida Institute of Engineering and Technology, Greater Noida, India.
Water Environ Res. 2020 Jul;92(7):1051-1056. doi: 10.1002/wer.1300. Epub 2020 Feb 14.
In recent years, several studies have been developed to search for sustainable and eco-friendly natural coagulants as an alternative to inorganic and synthetic coagulants to obtain drinking water. Despite the performance and cost-effectiveness of these coagulants, they require pH and alkalinity adjustments, they generate high volumes of sludge, and their residuals in treated water (e.g., aluminum) are linked with neurodegenerative diseases such as Alzheimer's, as well as neurotoxic and carcinogenic effects. Moringa oleifera seeds had shown better coagulation properties but have numerous limitations which have prompted us to find better alternatives. To the best part of my knowledge, utilization of its leaves extract obtained from different organic solvents in water purification has rarely been reported. Our findings clearly revealed that M. oleifera leaves hexane extract has significantly improved the water quality parameters including pH (8.2-7.1), TDS (512-221), hardness (246-138), turbidity (15.6-6.1), fluoride (2.3-1.1), and Escherichia coli count (315-41) whereas alum effectively improved these parameters at a dose of 50 mg/L. Moringa oleifera showed significant removal capability in comparison to alum but slightly at higher dose, thus our results strongly supported the efficacy of M. oleifera leaves extracts as better alternative to chemical coagulant in water purification. PRACTITIONER POINTS: Chemical coagulants pose severe side effects to humans such as neurodegenerative diseases. Use of Moringa oleifera leaves as natural coagulants in water purification is a cost-effective approach due to its easy availability throughout the year. Moringa oleifera leaves exhibited significant coagulating efficiency by improving water quality parameters including pH, turbidity, total dissolved solids, fluoride, hardness, and E. coli count.
近年来，已经开展了多项研究，以寻找可持续和环保的天然凝结剂，作为替代无机和合成凝结剂来获取饮用水。尽管这些凝结剂的性能和成本效益都很好，但它们需要 pH 值和碱度调节，会产生大量污泥，而且处理水中的残留物（如铝）与阿尔茨海默病等神经退行性疾病以及神经毒性和致癌作用有关。辣木籽表现出更好的凝结性能，但有许多限制，这促使我们寻找更好的替代品。就我所知，很少有报道利用不同有机溶剂从辣木叶中提取的提取物来净化水。我们的研究结果清楚地表明，辣木叶己烷提取物显著改善了水质参数，包括 pH 值（8.2-7.1）、总溶解固体（TDS）（512-221）、硬度（246-138）、浊度（15.6-6.1）、氟化物（2.3-1.1）和大肠杆菌数（315-41），而明矾在 50mg/L 的剂量下能有效改善这些参数。与明矾相比，辣木表现出显著的去除能力，但在较高剂量时略低，因此我们的结果强烈支持辣木叶提取物作为化学凝结剂的更好替代品在水净化中的功效。从业者要点：化学凝结剂对人类有严重的副作用，如神经退行性疾病。由于辣木叶全年都很容易获得，因此将其作为天然凝结剂用于水净化是一种具有成本效益的方法。辣木叶通过改善水质参数，包括 pH 值、浊度、总溶解固体、氟化物、硬度和大肠杆菌数，表现出显著的凝结效率。
