Chemiqua Water & Wastewater Company, 31-066, Kraków, Poland.
Polish Geological Institute National Research Institute, 00-975, Warszawa, Poland.
Environ Sci Pollut Res Int. 2022 Feb;29(6):8514-8524. doi: 10.1007/s11356-021-16278-z. Epub 2021 Sep 7.
Carwash wastewater treatment with potassium ferrate (VI) (KFeO) was optimized by response surface methodology. The optimum conditions for chemical oxygen demand removal were established a pH 3.5, 0.328 g/L dose of KFeO, and with a process duration of 48 min. At these conditions, chemical oxygen demand, total organic carbon, total nitrogen, and total phosphorus decreased by 70.3, 58.9, 73.3, 82.0%, respectively; and the putrid odor was reduced. Simultaneously, the total viable count, total coli count, most probable number of fecal enterococci, and the total proteolytic bacteria count decreased by 89.5, 93.1, 92.9, and 95.0 %, respectively. Comparatively, an application of 0.450 g/L FeCl·6HO corresponding to the iron content in 0.328 g/L of KFeO resulted in a decrease of total viable count, total coli count, most probable number of fecal enterococci and the total proteolytic bacteria count only by 38.1, 31.2, 42.9, and 58.0%, respectively. Therefore, flocculation with polyacrylamide anionic flocculant combined with potassium ferrate (VI) oxidation is a more effective alternative to coagulation with FeCl and the same flocculant. The use of potassium ferrate (VI) is a viable option for the treatment of carwash wastewater.
采用响应面法优化高铁酸钾（KFeO）处理洗车废水。确定了化学需氧量去除的最佳条件为 pH 3.5、KFeO 投加量 0.328g/L、处理时间 48min。在此条件下，化学需氧量、总有机碳、总氮和总磷分别降低了 70.3%、58.9%、73.3%和 82.0%，恶臭得到了减轻。同时，总活菌数、总大肠菌群、粪大肠菌群最可能数和总蛋白水解菌数分别降低了 89.5%、93.1%、92.9%和 95.0%。相比之下，应用 0.450g/LFeCl·6HO（相当于 0.328g/LKFeO 中的铁含量）仅使总活菌数、总大肠菌群、粪大肠菌群最可能数和总蛋白水解菌数分别降低了 38.1%、31.2%、42.9%和 58.0%。因此，与使用 FeCl 和相同的絮凝剂进行混凝相比，使用阴离子型聚丙烯酰胺絮凝剂与高铁酸钾（VI）氧化结合的絮凝是一种更有效的替代方法。使用高铁酸钾（VI）是处理洗车废水的可行选择。
