Worku Getahun Demeke, Abate Shimeles Nigussie
Department of Chemical Engineering, Kombolcha Institute of Technology, Wollo University, Ethiopia.
Heliyon. 2025 Feb 10;11(4):e42379. doi: 10.1016/j.heliyon.2025.e42379. eCollection 2025 Feb 28.
The issue of water contamination has gotten worse worldwide due to industrialization and population increase. The wastewater discharge techniques used by Ethiopia's textile sector do not comply with the national discharge standard. Because the discharge of inadequately treated or untreated textile effluent into the environment is becoming more frequent. Thus, minimizing this trend's harm to the environment requires using the best wastewater treatment technology. Coagulation is considered one of the most effective methods for treating textile wastewaters, which technically need to have a natural or artificial coagulant added to eliminate dangerous pollutants. Nonetheless, criticism has been leveled against the use of chemical coagulants due to their serious disadvantages. This has led to an interest in substituting natural materials for chemical coagulants. The main objective of this study was to evaluate and compare the effectiveness of various powders and seed cactus pad powders when employed as a natural coagulant to clean up textile effluent. seeds and cactus pad consist of proteins (cationic and dimeric) which help in neutralizing and absorbing colloidal charges in water containing suspended solids. To examine the impacts of various operating parameters, including coagulant dose, pH, and mixing time, as well as the ideal coagulation conditions, experiments were conducted using a jar testing system. The ideal parameters were pH 4, 5 g/l of coagulant, 40 min of mixing time, 2 min of fast mixing at 100 rpm, 40 min of gradual mixing at 40 rpm, and 30 min of settling time. Under these ideal circumstances, 82.33 Moreover, cactus pad powder reduced turbidity by 53.16 %, TDS by 97 %, BOD by 58.75 %, COD by 25.37 %, Conductivity by 60 %, and TSS by 56.33 %. Therefore, using as a natural coagulant is advised. Rather than using , it efficiently eliminates turbidity, TDS, and TSS from wastewater effluents from the textile sector. Eventually, one of the natural coagulants employed in the coagulation process, , proved to be useful and was chosen.
由于工业化和人口增长，全球水污染问题日益严重。埃塞俄比亚纺织行业所采用的废水排放技术不符合国家排放标准。因为未经充分处理或未处理的纺织废水排放到环境中的情况越来越频繁。因此，要尽量减少这种趋势对环境的危害，就需要采用最佳的废水处理技术。混凝被认为是处理纺织废水最有效的方法之一，从技术上讲，需要添加天然或人工混凝剂以去除危险污染物。然而，由于化学混凝剂存在严重缺点，人们对其使用提出了批评。这引发了用天然材料替代化学混凝剂的兴趣。本研究的主要目的是评估和比较各种粉末以及仙人掌果肉粉末作为天然混凝剂用于净化纺织废水时的有效性。种子和仙人掌果肉含有蛋白质（阳离子和二聚体），有助于中和和吸收含有悬浮固体的水中的胶体电荷。为了研究各种运行参数的影响，包括混凝剂剂量、pH值和混合时间，以及理想的混凝条件，使用搅拌试验系统进行了实验。理想参数为pH值4、混凝剂5 g/l、混合时间40分钟、100 rpm快速混合2分钟、40 rpm逐步混合40分钟以及沉降时间30分钟。在这些理想条件下，此外，仙人掌果肉粉末使浊度降低了53.16%，总溶解固体降低了97%，生化需氧量降低了58.75%，化学需氧量降低了25.37%，电导率降低了60%，总悬浮固体降低了56.33%。因此，建议使用作为天然混凝剂。它能有效去除纺织行业废水排放中的浊度、总溶解固体和总悬浮固体，而不是使用。最终，在混凝过程中使用的天然混凝剂之一被证明是有用的并被选用。
