Department of Chemical and Environmental Engineering, Faculty of Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia.
Environ Technol. 2011 Jul;32(9-10):971-7. doi: 10.1080/09593330.2010.521955.
Many coagulants, mainly inorganic, are widely used in conventional water and wastewater treatment. Recent studies reported the occurrence of some chronic diseases associated with residual coagulant in treated wastewater. The use of alternative coagulants which are biodegradable and environmentally friendly could alleviate the problem associated with these diseases. This work investigates the capability of Jatropha curcas seed and presscake (the residue left after oil extraction) to reduce the turbidity of wastewater through coagulation. The coagulant was prepared by dissolving Jatropha curcas seed and presscake powder into solution. Then jar tests were conducted on kaolin solution as the model wastewater. The Jatropha seed was found to be an effective coagulant with more than 96% of turbidity removal at pH 1-3 and pH 11-12. The highest turbidity removal was recorded at pH 3 using a dosage of 120 mg/L. The flocs formed using Jatropha were observed to be bigger and to sediment faster when compared with flocs formed using alum. The turbidity removal was high (>98%) at all turbidities (100 NTU to 8000 NTU), suggesting its suitability for a wide range of industrial wastewater. The performance of Jatropha presscake after extraction of oil was also comparable to the fresh seed and alum at highly acidic and highly alkaline conditions. The addition of Jatropha did not significantly affect the pH of the kaolin samples after treatment and the sludge volume produced was less in comparison to alum. These results strongly support the use of Jatropha curcas seed and presscake as a potential coagulant agent.
许多混凝剂，主要是无机的，被广泛应用于常规的水和废水处理中。最近的研究报告了一些与处理废水中残留混凝剂有关的慢性疾病的发生。使用可生物降解和环境友好的替代混凝剂可以缓解与这些疾病相关的问题。这项工作研究了麻疯树种子和麻疯树饼（提取油后留下的残渣）通过混凝降低废水浊度的能力。混凝剂是通过将麻疯树种子和麻疯树饼粉末溶解在溶液中制备的。然后，在高岭土溶液作为模型废水的条件下进行了瓶试验。结果表明，麻疯树种子是一种有效的混凝剂，在 pH 值为 1-3 和 pH 值为 11-12 时，浊度去除率超过 96%。在 pH 值为 3 时，用 120mg/L 的剂量可达到最高的浊度去除率。与使用明矾形成的絮体相比，使用麻疯树形成的絮体更大，沉淀更快。在所有浊度（100NTU 到 8000NTU）下，浊度去除率都很高（>98%），这表明它适用于广泛的工业废水。在强酸和强碱条件下，提取油后的麻疯树饼的性能也与新鲜种子和明矾相当。添加麻疯树后，处理后的高岭土样品的 pH 值没有显著变化，与明矾相比，产生的污泥体积较少。这些结果强烈支持将麻疯树种子和麻疯树饼用作潜在的混凝剂。
