Department of Sanitary and Environmental Engineering, Federal University of Santa Maria, Avenida Roraima, 1000, Santa Maria, Camobi, RS, 97105‑900, Brazil.
Environ Sci Pollut Res Int. 2022 Jul;29(32):49439-49456. doi: 10.1007/s11356-022-20630-2. Epub 2022 May 18.
Domestic wastewater is an important alternative source of water in the face of a growing discrepancy between water availability and demand. The use of techniques that enable the urban reuse of treated sewage is essential to make cities more sustainable and resilient to water scarcity. The main goal of this study was to evaluate the performance of an electrocoagulation-flotation system in the treatment of domestic wastewater for urban reuse. The study was performed using raw domestic wastewater samples. The electrocoagulation-flotation system was a cylindrical reactor with aluminum electrodes. The treatment conditions involved agitation at 262.5 rpm, electrical current of 1.65 A, electrolysis time of 25 min, an initial pH of 6, and inter-electrode distance of 1 cm. Overall, the electrocoagulation-flotation system was highly efficient for removal of apparent color (97.9%), chemical oxygen demand (82.9%), turbidity (95.8%), and orthophosphate phosphorous (> 98.2%). The electrocoagulation-flotation system had a consumption of electrical energy ranging from 9.5 to 13.3 kWh m, electrode mass from 294.7 to 557.0 g m, and hydrochloric acid from 4.3 to 6.6 L m. Sludge production in the system ranged from 1,125.7 to 1,835.7 g m. Treated wastewater had a satisfactory quality for several urban reuse activities. The electrocoagulation-flotation system showed potential to be used for domestic wastewater treatment for urban reuse purposes.
生活污水是在水资源供需矛盾日益加剧的情况下，一种重要的替代水源。利用能够实现城市处理后污水再利用的技术对于使城市更加可持续和适应水资源短缺至关重要。本研究的主要目的是评估电絮凝浮选系统在处理生活污水以实现城市再利用方面的性能。该研究使用未经处理的生活污水样本进行。电絮凝浮选系统是一个带有铝电极的圆柱形反应器。处理条件包括以 262.5 rpm 的速度搅拌、电流 1.65 A、电解时间 25 分钟、初始 pH 值为 6 以及电极间距为 1 厘米。总的来说，电絮凝浮选系统对去除表观颜色（97.9%）、化学需氧量（82.9%）、浊度（95.8%）和正磷酸盐磷（>98.2%）非常有效。电絮凝浮选系统的电能消耗范围为 9.5 至 13.3 kWh/m，电极质量为 294.7 至 557.0 g/m，盐酸用量为 4.3 至 6.6 L/m。系统产生的污泥量为 1125.7 至 1835.7 g/m。处理后的污水可满足多种城市再利用活动的要求。电絮凝浮选系统显示出在处理生活污水以实现城市再利用方面的潜力。
