屋面雨能驱动微滤膜池耦合电氧化消毒处理雨水

UTILIZING ROOF RAINWATER ENERGY TO DRIVE MICROFILTRATION MEMBRANE COUPLED WITH ELECTRO-OXIDATION DISINFECTION TO TREAT RAINWATER

为屋面雨水的再生研发合适的处理技术,提出了一种利用屋面雨能驱动微滤膜池耦合电氧化消毒处理屋面雨水的系统,研究了重力驱动膜生物反应器处理模拟屋面雨水的效果。在运行280 h的设定水头(ΔH=0.6 m)下,膜通量稳定在7 L/(㎡·h),膜出水浊度控制在0.34 NTU以下,其对有机物的去除率很低,但对氨氮的去除率可达到80%以上。对膜上滤饼层进行扫描电子显微镜(SEM)和能谱(EDS)分析表明,滤饼层上存在大量构成有机化合物的元素,而且滤饼层具有去除痕量金属的能力。电氧化工艺的消毒结果表明,Ti/IrO_(2)-Ta_(2)O_(5)电极杀菌消毒效果优良,当电流密度为10 mA/c㎡,电氧化消毒时间≥15 min时,出水细菌总数<100 CFU/mL。该研究可为屋面雨水的处理和应用提供参考。

Inorder to develope suitable treatment technologies for roof rainwater reclamation,a system utilizing roof rainwater energy to drive a microfiltration membrane pool coupled with electro-oxidation disinfection to treat roof rainwater was proposed.Firstly,the gravity-driven membrane bioreactor performance in treatment of simulated roof rainwater was investigated.The membrane permeate flux stabilized at 7 L/(㎡·h)under a set water head(ΔH=0.6 m)over 280 hours of operation,and the turbidity of membrane effluent was lower than 0.34 NTU.However,the removal rate of organic matter was limited,while the removal rate of NH3-N reached 80%above.Then,scanning electron microscopy(SEM)and energy dispersive spectrometry(EDS)analysis confirmed that diverse elements constituting organic compounds existed in the filter cake layer on the vicinity of membrane,and the filter cake layer exhibited good performance in trace metals removal.Finally,the disinfection results of the electro-oxidation process showed that Ti/IrO_(2)-Ta_(2)O_(5) electrode had excellent sterilization effect.When the current density was 10 mA/c㎡ and the electro-oxidation time was not shorter than 15 min,the total number of bacteria in the effluent was less than 100 CFU/mL.The research provided a reference for the treatment and disinfection of roof rainwater.