In this study, the efficiencies of the use of rice husk, cypress, and Eucalyptus leaves biocoagulants as alternative to alum as chemical coagulant in reducing turbidity and stabilizing the pH of slaughterhouse wastewater and three other local drinking water sources were investigated. Two systems were used: one involving individual coagulants and the second involving mix alum and biocoagulant with fixed alum dose of 0.05 g and varying amounts of each biocoagulant type (0.05 to 5 g). Turbidity reduction, coagulation activity, and pH variation were used to characterize each system. Results show reduction in turbidity is higher in mixed coagulants than with individual coagulants. At 5 g each of alum, rice husk, cypress, and Eucalyptus leaves, the corresponding turbidity values, 8.3, 13.6, 14.5, and 20.3 NTU, were obtained compared to 7.3 with 0.05 alum and 5 g rice husk mixture, 8.7 NTU with 0.05 g alum and 5 g cypress leaves mixture, and 16.1 NTU with 0.05 g alum and 5 g Eucalyptus leaves mixture, for 37.3 NTU initial turbidity. The used biocoagulants individually show insignificant effect on the pH of coagulation-treated water. Alum has an insignificant effect up to 2 g. 0.05 g of each biocoagulant stabilizes the pH between 6.57 and 7.34 against 4.14 for alum. 0.05 g alum/0.05 g biocoagulant stabilized the pH of water between 6.32 and 7.41. The coagulation activities for individual systems follow the order alum > rice husk > cypress > Eucalyptus, and for mixed systems, alum/rice husk > alum/cypress > alum/Eucalyptus. Water with turbidity and pH values within the World Health Organization’s guideline value of < 5 NTU and 6.5–8.5, respectively, were obtained using studied low cost and locally available biocoagulants.

中文翻译：

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稻壳、柏叶、桉树叶粉与明矾在改善喀麦隆巴门达一些地方水源浊度和pH值的混凝性能比较

在这项研究中，调查了使用稻壳、柏树和桉树叶生物混凝剂替代明矾作为化学混凝剂在降低屠宰废水和其他三个当地饮用水源的浊度和稳定 pH 值方面的效率。使用了两种系统：一种涉及单独的凝结剂，第二种涉及混合明矾和生物凝结剂，明矾剂量为 0.05 克，每种生物凝结剂的用量各不相同（0.05 至 5 克）。浊度降低、凝结活性和 pH 值变化用于表征每个系统。结果显示混合混凝剂的浊度降低比使用单独混凝剂的要高。明矾、稻壳、柏树、桉树各5克叶，相应的浊度值分别为 8.3、13.6、14.5 和 20.3 NTU，相比之下，0.05 明矾和 5 g 稻壳混合物为 7.3，0.05 g 明矾和 5 g 柏叶混合物为 8.7 NTU，以及 10.1 NTU 和 16.05 NTU g 明矾和 5 g桉树叶混合物，初始浊度为 37.3 NTU。所使用的生物混凝剂对混凝处理水的 pH 值的影响微乎其微。明矾在 2 g 以内的影响微乎其微。0.05 克每种生物凝结剂可将 pH 值稳定在 6.57 和 7.34 之间，而明矾则为 4.14。0.05 克明矾/0.05 克生物凝结剂使水的 pH 值稳定在 6.32 和 7.41 之间。单个系统的凝固活动遵循明矾>稻壳>柏树>桉树的顺序 ，对于混合系统，明矾/稻壳>明矾/柏树>明矾/桉树。浊度和 pH 值分别在世界卫生组织指导值 < 5 NTU 和 6.5–8.5 范围内的水是使用研究过的低成本和当地可用的生物凝结剂获得的。