Getahun Moltot, Befekadu Adisu, Alemayehu Esayas
Werabe Universitya, Institute of Technology, Department of Water Supply and environmental Engineering,Werabe, Box-046.Ethiopia.
Jimma University, Jimma Institute of Technology, Faculty of Civil and Environmental Engineering, Jimma, Po Box - 378.Ethiopia.
Heliyon. 2024 Mar 19;10(7):e27584. doi: 10.1016/j.heliyon.2024.e27584. eCollection 2024 Apr 15.
The growing problem of industrial pollution in developing countries, especially Ethiopia, has sparked serious issues about the quality of the water, particularly when it comes to the effluent from wet coffee processing industries. In response, this study investigates the potential of utilizing natural coagulants, Acanthus sennii C., Moringa stenopetala B., and Aloe vera L., either individually or in combination, for the treatment of coffee effluent. Methodologically, the study systematically varies operational parameters, including coagulant dose, pH levels, stirring speed, and stirring time, to evaluate their impact on coagulation efficiency. Experimental data undergo statistical analysis, employing ANOVA, while computational optimization techniques are employed using Design Expert software to determine optimal conditions. Notably, the blended form of the three coagulants emerges as particularly promising, yielding optimal conditions of 0.750 g/L coagulant dosage, pH 8.76, agitation speed of 80.73 rpm, and agitation time of 19.23 min. Under these optimized conditions, the blended coagulant achieves remarkable removal efficiencies, approximately 99.99% for color and 98.7% for turbidity. These findings underscore the efficiency of natural coagulants, particularly in blended form, for sustainable wastewater treatment in wet coffee processing.
发展中国家，尤其是埃塞俄比亚，日益严重的工业污染问题引发了关于水质的严重问题，特别是涉及湿法咖啡加工业的废水时。作为回应，本研究调查了单独或组合使用天然凝结剂（刺苞花、狭瓣辣木和库拉索芦荟）处理咖啡废水的潜力。在方法上，该研究系统地改变操作参数，包括凝结剂剂量、pH值、搅拌速度和搅拌时间，以评估它们对凝结效率的影响。实验数据采用方差分析进行统计分析，同时使用Design Expert软件采用计算优化技术来确定最佳条件。值得注意的是，三种凝结剂的混合形式显得特别有前景，产生了0.750 g/L的凝结剂剂量、pH 8.76、80.73 rpm的搅拌速度和19.23分钟的搅拌时间的最佳条件。在这些优化条件下，混合凝结剂实现了显著的去除效率，颜色去除率约为99.99%，浊度去除率为98.7%。这些发现强调了天然凝结剂，特别是混合形式的天然凝结剂，在湿法咖啡加工中可持续废水处理的效率。
